CN105899886A - Pump number control method, pump number control device, pump system, heat source system and program - Google Patents

Abstract

The pump station number control method comprises a step of increasing or decreasing the number of operating pumps based on the flow rate of a heat medium pumped to a load (40) by a plurality of pumps connected in parallel, a heat load required by the load, and a frequency command value instructed to each of the plurality of pumps during operation.

Description

Translated fromChinese

泵台数控制方法、泵台数控制装置、泵系统、热源系统及程序Pump number control method, pump number control device, pump system, heat source system and program

技术领域technical field

本发明涉及泵台数控制方法、泵台数控制装置、泵系统、热源系统以及程序。The invention relates to a method for controlling the number of pumps, a device for controlling the number of pumps, a pump system, a heat source system and a program.

本申请基于2014年1月31日在日本提交的特愿2014-017187号主张优先权，并将其内容援引于此。this application claims priority based on Japanese Patent Application No. 2014-017187 for which it applied to Japan on January 31, 2014, and uses the content here.

背景技术Background technique

在从热源机向空调机等的负载装置提供冷水或温水(以下，冷温水)等热介质的热源系统中，除了向热源机压送冷温水的1次泵之外，以向远离热源机的空调机再次压送热介质为目的而设置并联连接于热源机与空调机之间的多台2次泵的情况较多。在具有那样的2次泵的热源系统中，存在为了满足向负载装置的喷出流量而决定2次泵的运转台数的方法。在这样的方法中，一般而言，进行如下控制的情况较多：设定成为进行泵的台数增减的基准的阈值，若由在供给路径的中途所具备的计测器所测量的热介质的流量超过该阈值时，则追加启动泵，反之若成为阈值以下则停止泵。但是，若仅以如此测量出的流量来进行泵运转台数的增减的判断，则有可能虽然泵的能力还有余量即泵的频率较之于额定频率还有余量，也会追加启动泵。In a heat source system that supplies heat medium such as cold water or warm water (hereinafter, cold and warm water) from a heat source machine to a load device such as an air conditioner, in addition to the primary pump that pressurizes cold and warm water to the heat source machine, the The air conditioner often installs a plurality of secondary pumps connected in parallel between the heat source unit and the air conditioner for the purpose of pumping the heat medium again. In a heat source system including such a secondary pump, there is a method of determining the number of secondary pumps to operate in order to satisfy the discharge flow rate to the load device. In such a method, generally speaking, the following control is often performed: setting a threshold value as a reference for increasing or decreasing the number of pumps, and if the heat medium is measured by a measuring device in the middle of the supply path When the flow rate exceeds the threshold value, the pump will be additionally started, otherwise, if the flow rate is below the threshold value, the pump will be stopped. However, if the determination of the increase or decrease in the number of pumps is performed only by the flow rate measured in this way, there is a possibility that additional pumps will be started even though the capacity of the pump has a margin, that is, the frequency of the pump has a margin compared to the rated frequency. Pump.

例如在专利文献1中，通过将根据表示按2次泵的每个运转台数而规定的泵的喷出压力与泵的喷出流量的关系的曲线、以及表示向负载装置供给的热介质的流量与其所需要的泵的喷出压力的相关关系的控制线的交点而决定的流量作为阈值来使泵运转台数发生变化，从而设定了在台数变化后也能维持喷出压力的流量的阈值。For example, in Patent Document 1, a curve representing the relationship between the discharge pressure of the pump and the discharge flow rate of the pump, which is specified for each number of pumps operated twice, and the flow rate of the heat medium supplied to the load device The flow rate determined by the intersection point of the control line related to the required pump discharge pressure is used as a threshold to change the number of pumps in operation, thereby setting the threshold of the flow rate that can maintain the discharge pressure even after the number of pumps is changed.

现有技术文献prior art literature

专利文献patent documents

专利文献1：日本国专利第5261153号公报Patent Document 1: Japanese Patent No. 5261153

发明内容Contents of the invention

发明要解决的课题The problem to be solved by the invention

在专利文献1的方法的情况下，若不能准确把握配管的压损特性，获得反映了压损特性的控制线，则难以得到想要的阈值。所谓配管的压损，是指在配管中流动热介质时产生的摩擦、配管的弯曲、阀门的阻尼等所致的泵喷出压力的损失，所谓压损特性，是指压损相对于热介质的流量的变化特性。尤其在负载装置为空调机的情况下，由于系统的压损会根据空调机中所具备的控制阀发生变化，因此若不考虑上述控制线也变化的情况，则有可能用于泵的运转台数控制的阈值会发生偏差。若泵的运转台数不在适当的定时变化，则热介质的流量或压力等会根据多余的台数变化而变动，将不能稳定地运转热源系统。In the case of the method of Patent Document 1, it is difficult to obtain a desired threshold unless the pressure loss characteristics of the piping are accurately grasped and a control line reflecting the pressure loss characteristics is obtained. The so-called pressure loss of the piping refers to the loss of the pump discharge pressure caused by the friction generated when the heat medium flows in the piping, the bending of the piping, and the damping of the valve. The so-called pressure loss characteristics refer to the pressure loss relative to the heat medium The changing characteristics of the flow. Especially when the load device is an air conditioner, since the pressure loss of the system will change according to the control valve equipped in the air conditioner, if the above-mentioned control line is not considered, it may be used for the operating number of the pump. The threshold of control will deviate. If the number of operating pumps is not changed at an appropriate timing, the flow rate and pressure of the heat medium will fluctuate according to the change in the number of redundant pumps, and the heat source system cannot be operated stably.

本发明提供泵台数控制方法、泵台数控制装置、泵系统、热源系统以及程序。The invention provides a method for controlling the number of pumps, a device for controlling the number of pumps, a pump system, a heat source system and a program.

用于解决课题的手段means to solve the problem

根据本发明的第一形态，泵台数控制方法具有：基于由并联连接的多个泵向负载压送的热介质的流量或所述负载所需的热负荷、以及向所述多个泵当中的运转中的各泵指示的频率指令值，来增减所述泵的运转台数的工序。According to the first aspect of the present invention, the method for controlling the number of pumps includes: based on the flow rate of the heat medium pumped to the load by the plurality of pumps connected in parallel or the heat load required by the load, and the flow rate of the heat medium to the load among the plurality of pumps. A process of increasing or decreasing the number of operating pumps by using the frequency command value indicated by each pump in operation.

根据本发明的第二形态，在第一形态所涉及的泵台数控制方法中，具有：根据所述多个泵当中的运转中的泵的喷出流量的测量值来获取表示向所述负载压送的热介质的流量的台数判断流量值的工序，增减所述泵的运转台数的工序，在所述台数判断流量值为预先规定的阈值Gα以上、并且向各泵指示的频率指令值为预先规定的阈值Fα以上的情况下，增加所述泵的运转台数，此外，在所述台数判断流量值为预先规定的阈值Gβ以下、并且向各泵指示的频率指令值为预先规定的阈值Fβ以下的情况下，减少所述泵的运转台数。According to a second aspect of the present invention, in the method for controlling the number of pumps according to the first aspect, the flow rate indicating the flow rate to the load pressure is acquired based on the measured value of the discharge flow rate of an operating pump among the plurality of pumps. The step of determining the flow value of the flow rate of the heat medium to be sent is the step of increasing or decreasing the number of operating pumps, when the flow rate value of the number of pumps is determined to be greater than or equal to a predetermined threshold value Gα, and the frequency command value instructed to each pump is When the predetermined threshold value Fα is greater than or equal to the predetermined threshold value Fα, the number of operating pumps is increased, and when the flow rate value of the number of pumps is determined to be less than the predetermined threshold value Gβ, and the frequency command value instructed to each pump is the predetermined threshold value Fβ In the following cases, reduce the number of operating pumps.

根据本发明的第三形态，在第一形态所涉及的泵台数控制方法中，具有计算所述负载所要求的热负荷的工序，增减所述泵的运转台数的工序，在所述热负荷为预先规定的阈值Lα以上、并且向各泵指示的频率指令值为预先规定的阈值Fα以上的情况下，增加所述泵的运转台数，此外，在所述热负荷为预先规定的阈值Lβ以下、且向各泵指示的频率指令值为预先规定的阈值Fβ以下的情况下，减少所述泵的运转台数。According to a third aspect of the present invention, in the method for controlling the number of pumps according to the first aspect, there is a step of calculating a heat load required by the load, and a step of increasing or decreasing the number of operating pumps, and the heat load When the frequency command value instructed to each pump is equal to or greater than a predetermined threshold value Lα and the predetermined threshold value Fα is greater than or equal to the predetermined threshold value Fα, the number of pumps to be operated is increased, and when the thermal load is equal to or less than a predetermined threshold value Lβ And when the frequency command value instructed to each pump is equal to or less than a predetermined threshold value Fβ, the number of operating pumps is reduced.

根据本发明的第四形态，在第二或者第三形态所涉及的泵台数控制方法中，增减所述泵的运转台数的工序，还将所述泵的泵压头与作为增加所述泵的台数的阈值的增加台数许可泵压头或作为减少所述泵的台数的阈值的减少台数许可泵压头进行比较，仅在所述增加台数许可泵压头小于所述泵压头的情况下，增加泵的运转台数，仅在所述减少台数许可泵压头大于所述泵压头的情况下，减少泵的运转台数。According to a fourth aspect of the present invention, in the method for controlling the number of pumps according to the second or third aspect, in the step of increasing or decreasing the number of operating pumps, the pump pressure head of the pump is also used as an increase in the pump head. Compared with the allowable pump head for increasing the number of the threshold value of the number of pumps or the allowable pump head for reducing the number of pumps as the threshold for reducing the number of pumps, only when the allowable pump head for increasing the number of pumps is smaller than the pump head , increasing the operating number of the pumps, and reducing the operating number of the pumps only when the reduced number allows the pump head to be greater than the pump head.

根据本发明的第五形态，在第四形态所涉及的泵台数控制方法中，具有以下工序：根据基于所述泵运转台数增加后的泵的喷出流量以及泵压头相对于泵的喷出流量的预先规定的相关关系而计算出的泵压头，计算使所述泵的频率以预先规定的阈值Fβ进行动作时的泵压头，来求取所述增加台数许可泵压头，此外，根据基于所述泵运转台数减少后的泵的喷出流量以及所述预先规定的相关关系而计算出的泵压头，计算使所述泵的频率以预先规定的阀值Fα进行动作时的泵压头，来求取所述减少台数许可泵压头。According to a fifth aspect of the present invention, in the method for controlling the number of pumps according to the fourth aspect, there is a step of: The pump pressure head calculated from the predetermined correlation of the flow rate is calculated to calculate the pump pressure head when the frequency of the pump is operated at the predetermined threshold value Fβ, and the pump pressure head allowed for the number of units to be increased is obtained. In addition, Based on the pump head calculated based on the discharge flow rate of the pump after the number of operating pumps has been reduced and the predetermined correlation, the pump when the frequency of the pump is operated at a predetermined threshold value Fα is calculated. The pressure head is used to obtain the pump pressure head allowed for the reduction of the number of units.

根据本发明的第六形态，在第二或者第三形态所涉及的泵台数控制方法中，具有以下工序：以泵的运转台数的增减后的泵压头与当前的泵压头相等为条件，基于所述运转中的泵的给定的频率下的泵压头与泵的喷出流量的预先规定的相关关系，来获取泵的运转台数增加后的频率指令值以及运转台数减少后的频率指令值，增减所述泵的运转台数的工序，进而仅在所述运转台数增加后的频率指令值大于所述阈值Fβ时增加泵的运转台数，此外，仅在所述运转台数减少后的频率指令值小于所述阈值Fα时减少泵的运转台数。According to a sixth aspect of the present invention, the method for controlling the number of pumps according to the second or third aspect includes the step of making the pump pressure head equal to the current pump pressure head after the increase or decrease in the number of operating pumps. , based on the predetermined correlation between the pump pressure head and the discharge flow rate of the pump at a given frequency of the pump in operation, the frequency command value after the number of pumps in operation is increased and the frequency after the number of pumps in operation is reduced Command value, the process of increasing or decreasing the operating number of the pumps, and then increasing the operating number of the pumps only when the frequency command value after the increased operating number is greater than the threshold value Fβ, and only when the operating number is reduced When the frequency command value is smaller than the threshold value Fα, the number of pumps to operate is reduced.

根据本发明的第七形态，在第二至第六形态的任一形态所涉及的泵台数控制方法中，具有以下工序：基于所述运转中的泵的给定的频率下的喷出流量与泵效率的预先规定的相关关系，来获取泵的运转台数增加后的泵效率和运转台数减少后的泵效率以及当前的泵效率，增减所述泵的运转台数的工序，进而仅在所述运转台数增加后的泵效率为所述当前的泵效率以上的情况下增加泵的运转台数，此外，仅在所述运转台数减少后的泵效率为所述当前的泵效率以上的情况下减少泵的运转台数。According to a seventh aspect of the present invention, the method for controlling the number of pumps according to any one of the second to sixth aspects includes the step of: The pre-specified correlation of pump efficiency, to obtain the pump efficiency after the number of operating pumps is increased, the pump efficiency after the number of operating pumps is reduced, and the current pump efficiency, and the process of increasing or decreasing the number of operating pumps, and then only in the above When the efficiency of the pumps after the increase in the number of operations is greater than the current pump efficiency, the number of pumps is increased, and only when the efficiency of the pumps after the reduction in the number of operations is greater than the current pump efficiency is reduced. number of operating units.

另外，根据本发明的第八形态，泵台数控制装置具备泵台数控制部，该泵台数控制部使向负载压送热介质的并联连接的多个泵的运转台数，基于向所述负载压送的热介质的流量或所述负载所需的热负荷、以及向所述多个泵当中的运转中的各泵指示的频率指令值来进行增减。In addition, according to the eighth aspect of the present invention, the pump number control device includes a pump number control unit that controls the number of operating pumps connected in parallel to pressure-feed the heat medium to the load based on the number of pumps that are pressure-feed to the load. The flow rate of the heating medium, the thermal load required by the load, and the frequency command value instructed to each of the operating pumps among the plurality of pumps are increased or decreased.

另外，根据本发明的第九形态，泵系统具备并联连接的多个泵以及第八形态所涉及的泵台数控制装置，变更所述泵的运转台数使得每台所述泵的泵压头以及流量测量值不变化。In addition, according to the ninth aspect of the present invention, the pump system includes a plurality of pumps connected in parallel and the pump number control device according to the eighth aspect, and the operating number of the pumps is changed such that the pump head and flow rate of each pump The measured value does not change.

另外，根据本发明的第十形态，热源系统具备：负载；并联连接的多个热源机，其压送热介质；2次泵，其将从并联连接的多个热源机压送的热介质进一步压送至负载；以及第八形态所涉及的泵台数控制装置。In addition, according to the tenth aspect of the present invention, the heat source system includes: a load; a plurality of heat source machines connected in parallel, which press-feed the heat medium; Pressure delivery to the load; and a control device for the number of pumps involved in the eighth form.

另外，根据本发明的第十一形态，程序使泵台数控制装置的计算机作为如下单元发挥功能：基于由并联连接的多个泵向负载压送的热介质的流量或所述负载所需的热负荷、以及向所述多个泵当中的运转中的各泵指示的频率指令值，来增减所述泵的运转台数的单元。In addition, according to the eleventh aspect of the present invention, the program causes the computer of the pump number control device to function as a unit based on the flow rate of the heat medium pressure-fed to the load by a plurality of pumps connected in parallel or the heat required by the load. A means for increasing or decreasing the operating number of the pumps by using a load and a frequency command value directed to each of the operating pumps among the plurality of pumps.

发明效果Invention effect

根据上述泵台数控制方法、泵台数控制装置、泵系统、热源系统以及程序，能够在不知道压损特性等设备特性的前提下，在适当的定时适当地控制泵的运转台数。According to the method for controlling the number of pumps, the device for controlling the number of pumps, the pump system, the heat source system, and the program, the number of operating pumps can be appropriately controlled at an appropriate timing without knowing the characteristics of equipment such as pressure loss characteristics.

附图说明Description of drawings

图1是本发明的第一实施方式的热源系统的概略图。Fig. 1 is a schematic diagram of a heat source system according to a first embodiment of the present invention.

图2是本发明的第一实施方式的泵台数控制装置的功能框图。Fig. 2 is a functional block diagram of the pump number control device according to the first embodiment of the present invention.

图3是表示本发明的第一实施方式的泵台数控制装置的处理流程的图。Fig. 3 is a diagram showing a processing flow of the pump number control device according to the first embodiment of the present invention.

图4是本发明的第一实施方式的变形例的热源系统的概略图。Fig. 4 is a schematic diagram of a heat source system according to a modified example of the first embodiment of the present invention.

图5是本发明的第一实施方式的变形例的泵台数控制装置的功能框图。5 is a functional block diagram of a pump number control device according to a modified example of the first embodiment of the present invention.

图6是本发明的第二实施方式的泵台数控制装置的功能框图。Fig. 6 is a functional block diagram of a pump number control device according to a second embodiment of the present invention.

图7是表示用于表征泵的特性的Q-H特性的一例的图。Fig. 7 is a graph showing an example of Q-H characteristics for characterizing pump characteristics.

图8A是表示使2次泵的运转台数从1台增加至2台时的变化的图。FIG. 8A is a diagram showing changes when the number of secondary pumps operated is increased from one to two.

图8B是表示使2次泵的运转台数从1台增加至2台时的变化的图。FIG. 8B is a diagram showing changes when the number of secondary pumps operated is increased from one to two.

图9是表示本发明的第二实施方式的泵台数控制装置的处理流程的图。9 is a diagram showing a processing flow of a pump number control device according to a second embodiment of the present invention.

图10是本发明的第三实施方式的泵台数控制装置的功能框图。Fig. 10 is a functional block diagram of a pump number control device according to a third embodiment of the present invention.

图11是表示本发明的第三实施方式的泵台数控制装置的处理流程的图。11 is a diagram showing a processing flow of a pump number control device according to a third embodiment of the present invention.

图12是本发明的第四实施方式的泵台数控制装置的功能框图。Fig. 12 is a functional block diagram of a pump number control device according to a fourth embodiment of the present invention.

图13是表示泵的喷出流量与泵效率的相关关系的一例的图。Fig. 13 is a graph showing an example of the correlation between the discharge flow rate of the pump and the pump efficiency.

图14是表示本发明的第四实施方式的泵台数控制装置的处理流程的图。14 is a diagram showing a processing flow of a pump number control device according to a fourth embodiment of the present invention.

具体实施方式detailed description

<第一实施方式><First Embodiment>

以下，参照图1～图3来说明本发明的第一实施方式的热源系统。Hereinafter, a heat source system according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3 .

图1是本发明的第一实施方式的热源系统的概略图。Fig. 1 is a schematic diagram of a heat source system according to a first embodiment of the present invention.

如图1所示，本实施方式的热源系统具备：热源机30、1次泵10、2次泵20、负载40、流量计21以及泵台数控制装置50。As shown in FIG. 1 , the heat source system of this embodiment includes a heat source machine 30 , a primary pump 10 , a secondary pump 20 , a load 40 , a flow meter 21 , and a pump number control device 50 .

热源机30是对负载提供水等冷却用或加热用的热介质的装置。1次泵10向热源机30压送热介质。热源机30是对负载提供水等冷却用或加热用的热介质的装置。在本实施方式的热源系统中，热源机30以及1次泵10的组合可以并联设置多个。在图中示出了将1次泵10并联设置多个的状态。The heat source unit 30 is a device that supplies a cooling or heating heat medium such as water to a load. The primary pump 10 pressure-feeds the heat medium to the heat source unit 30 . The heat source unit 30 is a device that supplies a cooling or heating heat medium such as water to a load. In the heat source system of the present embodiment, a plurality of combinations of the heat source machine 30 and the primary pump 10 may be provided in parallel. In the drawing, a state in which a plurality of primary pumps 10 are installed in parallel is shown.

2次泵20将从热源机30送来的热介质向负载40压送。2次泵20彼此并联连接设置，根据来自负载40的要求来控制向负载40提供的热介质的流量。The secondary pump 20 pressure-feeds the heat medium sent from the heat source unit 30 to the load 40 . The secondary pumps 20 are connected in parallel to each other, and control the flow rate of the heat medium supplied to the load 40 according to the request from the load 40 .

流量计21是对从泵压送的热介质的每单位时间的流量进行测量的流量计。The flow meter 21 is a flow meter that measures the flow rate per unit time of the heat medium pumped by the pump.

负载40例如是空调机。负载40对热介质进行放热或吸热，并使之后的热介质向热源机30回流。Load 40 is, for example, an air conditioner. The load 40 releases or absorbs heat from the heat medium, and then returns the heat medium to the heat source unit 30 .

泵台数控制装置50是具有根据负载40所需要的要求负荷来使2次泵20的运转台数进行台数增减的功能的装置。The pump number control device 50 is a device having a function of increasing or decreasing the number of secondary pumps 20 to be operated according to the required load required by the load 40 .

在图1中将热源机30、1次泵10、2次泵20各设置2台，但不限于这些台数。例如也可以将热源机30以及1次泵10各设置6台，将2次泵20设置9台。In FIG. 1 , two heat source machines 30 , one primary pump 10 , and two secondary pumps 20 are installed, but the number is not limited to these. For example, six heat source machines 30 and six primary pumps 10 may be provided each, and nine secondary pumps 20 may be provided.

另外，在该热源系统中，也可以具备为了根据负载40的要求负荷来调整热介质的供给量而对热源机30的运转台数进行控制的装置(未图示)。In addition, this heat source system may be provided with a device (not shown) that controls the number of heat source machines 30 to be operated in order to adjust the supply amount of the heat medium according to the required load of the load 40 .

图2是本发明的第一实施方式的泵台数控制装置的功能框图。Fig. 2 is a functional block diagram of the pump number control device according to the first embodiment of the present invention.

使用图2来说明本实施方式中的泵台数控制装置50。The pump number control device 50 in this embodiment will be described using FIG. 2 .

如图2所示，泵台数控制装置50具备：台数判断流量值获取部101、台数判断频率值获取部102、泵频率设定部103、流量获取部104、泵台数控制部105以及存储部200。As shown in FIG. 2 , the pump number control device 50 includes: a number determination flow value acquisition unit 101 , a number determination frequency value acquisition unit 102 , a pump frequency setting unit 103 , a flow rate acquisition unit 104 , a pump number control unit 105 and a storage unit 200 .

台数判断流量值获取部101从存储部200读出并获取在根据流量使2次泵20的运转台数进行增减的情况下使用的阈值即流量增加台数阈值Gα、流量减少台数阈值Gβ。另外，台数判断流量值获取部101例如通过以下的式(1)来计算台数判断流量值。The number-judging flow value acquisition unit 101 reads out from the storage unit 200 and acquires the thresholds used when increasing or decreasing the number of secondary pumps 20 operating according to the flow rate, that is, the flow rate increase number threshold Gα and the flow rate decrease number threshold Gβ. Moreover, the number determination flow value acquisition part 101 calculates the number determination flow value by the following formula (1), for example.

【数学式1】【Mathematical formula 1】

$\frac{{\mathrm{<span><span>G</span>G</span>}}_{\mathrm{<span><span>l</span>l</span>}\mathrm{<span><span>o</span>o</span>}\mathrm{<span><span>a</span>a</span>}\mathrm{<span><span>d</span>d</span>}}}{\underset{\mathrm{<span><span>i</span>i</span>}}{\overset{\mathrm{<span><span>n</span>no</span>}}{<span><span>\&Sigma;</span>\&Sigma;</span>}}{\mathrm{<span><span>G</span>G</span>}}_{\mathrm{<span><span>0</span>0</span>}\mathrm{<span><span>i</span>i</span>}}}<span><span>...</span>...</span><span><span>(</span>(</span>\mathrm{<span><span>1</span>1</span>}<span><span>)</span>)</span>$

在此，Gload是从运转中的全部2次泵20压送的水等热介质的流量的测量值。G0i是当前运转的2次泵的额定流量。台数判断流量值是运转中的全部泵的喷出流量的测量值相对于运转中的2次泵的额定流量之和的比例。Here, Gload is a measured value of the flow rate of heat medium such as water pumped from all secondary pumps 20 in operation. G0i is the rated flow rate of the currently operating secondary pump. The number-judging flow rate value is the ratio of the measured discharge flow rates of all the pumps in operation to the sum of the rated flow rates of the secondary pumps in operation.

台数判断频率值获取部102从存储部200读出并获取在根据频率而使2次泵20的运转台数进行增减的情况下使用的阈值即频率增加台数阈值Fα、频率减少台数阈值Fβ。另外，台数判断频率值获取部102从泵频率设定部103获取由泵频率设定部103对各2次泵20输出的频率指令值，设为台数判断频率值。The number determination frequency value acquisition unit 102 reads out from the storage unit 200 and acquires the frequency increase number threshold Fα and the frequency decrease number threshold Fβ, which are thresholds used when increasing or decreasing the number of secondary pumps 20 operating according to the frequency. Also, the number determination frequency value acquisition unit 102 acquires the frequency command value output from the pump frequency setting unit 103 to each secondary pump 20 from the pump frequency setting unit 103, and sets it as the number determination frequency value.

泵频率设定部103对2次泵20指示使泵运转的频率。所谓频率，是指用于使驱动2次泵20的电动机旋转的电力的频率，泵频率设定部103通过指定频率并变更泵的转速从而控制泵的输出。泵频率设定部103对处于运转状态的多个2次泵20输出相同的频率指令值。The pump frequency setting unit 103 instructs the secondary pump 20 to operate the pump at a frequency. The frequency refers to the frequency of electric power for rotating the motor driving the secondary pump 20 , and the pump frequency setting unit 103 controls the output of the pump by specifying the frequency and changing the rotational speed of the pump. The pump frequency setting unit 103 outputs the same frequency command value to the plurality of secondary pumps 20 in the operating state.

流量获取部104获取由流量计21测量出的热介质的流量。The flow rate acquisition unit 104 acquires the flow rate of the heat medium measured by the flow meter 21 .

泵台数控制部105在由泵压送的热介质的流量、泵的频率满足给定的条件时增加泵的运转台数。在本实施方式中，在满足以下2个条件的情况下增加泵的运转台数。The pump number control unit 105 increases the number of pumps to operate when the flow rate of the heat medium pumped by the pump and the frequency of the pump satisfy predetermined conditions. In this embodiment, the number of operating pumps is increased when the following two conditions are satisfied.

<增加台数条件1：基于流量的判断><Condition 1 for increasing the number of units: Judgment based on flow rate>

台数判断流量值≥Gα···(2)Judging by the number of units, the flow value ≥ Gα···(2)

<增加台数条件2：基于频率的判断><Condition 2 for increasing the number of units: Judgment based on frequency>

台数判断频率值≥Fα···(3)Number of units to determine the frequency value ≥ Fα···(3)

在此，台数判断频率值是与由泵频率设定部103向2次泵20输出的频率指令值Fset相同的值。Fα是由台数判断频率值获取部102获取到的阈值。Here, the number determination frequency value is the same value as the frequency command value Fset output from the pump frequency setting unit 103 to the secondary pump 20 . Fα is a threshold value acquired by the unit number determination frequency value acquisition unit 102 .

也就是，在由当前运转的全部2次泵20压送的流量相对于运转中的2次泵20所具有的送水能力的总和的比例为阈值Gα以上(式(2))、且向各2次泵20输出的频率指令值为阈值Fα以上(式(3))时，泵台数控制部105增加2次泵20的运转台数。That is, when the ratio of the flow rate pumped by all the secondary pumps 20 currently in operation to the sum of the water delivery capabilities of the secondary pumps 20 in operation is equal to or greater than the threshold value Gα (equation (2)), and each 2 When the frequency command value output by the secondary pump 20 is equal to or greater than the threshold value Fα (expression (3)), the pump number control unit 105 increases the number of secondary pumps 20 to operate.

另外，泵台数控制部105在由泵压送的热介质的流量、泵的频率满足给定的条件时减少泵的运转台数。在本实施方式中，在满足以下2个条件的情况下减少泵的运转台数。In addition, the pump number control unit 105 reduces the number of pumps to operate when the flow rate of the heat medium pumped by the pump and the frequency of the pump satisfy predetermined conditions. In this embodiment, the number of operating pumps is reduced when the following two conditions are satisfied.

<减少台数条件1：基于流量的判断><Condition 1 for reducing the number of units: Judgment based on flow rate>

台数判断流量值≤Gβ···(4)Judging by the number of flow rate ≤ Gβ···(4)

在此，Gβ是由台数判断流量值获取部101获取到的阈值。Here, Gβ is a threshold value acquired by the unit number determination flow value acquisition unit 101 .

<减少台数条件2：基于频率的判断><Number reduction condition 2: Judgment based on frequency>

台数判断频率值≤Fβ···(5)The number of units to determine the frequency value ≤ Fβ···(5)

在此，Fβ是由台数判断频率值获取部102获取到的阈值。另外，所谓台数判断频率值，例如是由泵频率设定部103对2次泵20指定的频率指令值。Here, Fβ is a threshold value acquired by the unit number determination frequency value acquisition unit 102 . In addition, the number determination frequency value is, for example, a frequency command value designated by the pump frequency setting unit 103 for the secondary pump 20 .

也就是，在由当前运转的全部2次泵20压送的流量相对于当前运转的2次泵20所具有的送水能力的总和的比例为阈值Gβ以下(式(4))、且向各2次泵20输出的频率指令值为阈值Fβ以下(式(5))时，泵台数控制部105减少2次泵20的运转台数。That is, when the ratio of the flow rate pumped by all the currently operating secondary pumps 20 to the sum of the water delivery capabilities of the currently operating secondary pumps 20 is equal to or less than the threshold value Gβ (equation (4)), and each 2 When the frequency command value output by the secondary pump 20 is less than or equal to the threshold value Fβ (expression (5)), the pump number control unit 105 reduces the number of secondary pumps 20 to operate.

存储部200保存有用于判定泵台数的增减的Gα、Fα等阈值、表征2次泵20的特性的信息等。特性信息例如是表示Q-H特性、泵的喷出流量与泵效率的相关关系的图表等。The storage unit 200 stores threshold values such as Gα and Fα for determining an increase or decrease in the number of pumps, information representing characteristics of the secondary pump 20 , and the like. The characteristic information is, for example, a Q-H characteristic, a graph showing the correlation between the discharge flow rate of the pump and the pump efficiency, and the like.

图3是表示本实施方式的泵台数控制装置的处理流程的图。FIG. 3 is a diagram showing a processing flow of the pump number control device according to the present embodiment.

使用图3的处理流程，来说明泵台数控制装置50使2次泵20的运转台数进行台数增减的处理。Using the processing flow of FIG. 3 , the processing of increasing or decreasing the number of secondary pumps 20 operated by the pump number control device 50 will be described.

作为前提，图1所示的热源系统工作，例如负载40是空调机，若使用者上下调整温度设定，则要求负荷增减，随之泵台数控制装置50控制2次泵20的运转台数。另外，设为紧跟在泵的台数增减之后的2次泵20的流量的总和与台数增减前无变化，此外，2次泵20的平均每台的泵压头(泵的扬程)也不变化。As a premise, the heat source system shown in FIG. 1 is working. For example, the load 40 is an air conditioner. If the user adjusts the temperature setting up and down, the load is required to increase or decrease, and the pump number control device 50 controls the number of secondary pumps 20 to operate. In addition, it is assumed that the sum of the flow rates of the secondary pumps 20 immediately after the increase or decrease in the number of pumps does not change from that before the increase or decrease in the number of pumps, and the average pump head (pump lift) per secondary pump 20 is also No change.

首先，流量获取部104获取流量计21所测量的每单位时间的流量(步骤S1)。流量计21测量出的流量是由1台或多台2次泵20压送的热介质的总流量。该测量值由于是对实际流经配管的流量进行测量而得到的值，因此能够认为是反映了配管的压损特性的值。First, the flow rate acquisition unit 104 acquires the flow rate per unit time measured by the flow meter 21 (step S1). The flow rate measured by the flow meter 21 is the total flow rate of the heat medium pumped by one or more secondary pumps 20 . Since this measured value is a value obtained by measuring the flow rate that actually flows through the piping, it can be considered as a value that reflects the pressure loss characteristics of the piping.

接下来，台数判断流量值获取部101读出并获取存储在存储部200中的上述阈值Gα、Gβ。另外，台数判断流量值获取部101根据式(1)来计算台数判断流量值(步骤S2)。台数判断流量值获取部101将这些值输出至泵台数控制部105。Next, the number determination flow value acquisition unit 101 reads out and acquires the threshold values Gα, Gβ stored in the storage unit 200 . Moreover, the number-of-unit determination flow value acquisition part 101 calculates the number-of-unit determination flow value based on Formula (1) (step S2). The number determination flow value acquisition unit 101 outputs these values to the pump number control unit 105 .

接下来，台数判断频率值获取部102读出并获取存储在存储部200中的上述阈值Fα、Fβ。另外，台数判断频率值获取部102将从泵频率设定部103对2次泵20指示的泵频率指令值获取为台数判断频率值(步骤S3)。台数判断频率值获取部102将这些值输出至泵台数控制部105。Next, the number determination frequency value acquisition unit 102 reads out and acquires the aforementioned threshold values Fα, Fβ stored in the storage unit 200 . Also, the number determination frequency value acquisition unit 102 acquires the pump frequency command value instructed to the secondary pump 20 from the pump frequency setting unit 103 as the number determination frequency value (step S3 ). The number determination frequency value acquisition unit 102 outputs these values to the pump number control unit 105 .

接下来，泵台数控制部105对式(2)以及式(3)加以评价来进行“增加台数条件1”以及“增加台数条件2”的判定(步骤S4)。然后，泵台数控制部105在满足两者的条件时(步骤S4＝是)，启动当前处于停止的2次泵20当中的1台，增加2次泵20的台数(步骤S5)。Next, the number-of-pumps control part 105 evaluates Formula (2) and Formula (3), and performs determination of "number-increase condition 1" and "number-increase condition 2" (step S4). Then, when both conditions are satisfied (step S4=Yes), the pump number control unit 105 activates one of the currently stopped secondary pumps 20 to increase the number of secondary pumps 20 (step S5).

在比较的结果是“增加台数条件1”以及“增加台数条件2”当中的任一条件不满足的情况下(步骤S4＝否)，前进至步骤S6的处理。As a result of the comparison, if any one of the "increase in the number of vehicles condition 1" and the "increased in the number of vehicles condition 2" is not satisfied (step S4=NO), it progresses to the process of step S6.

接下来，泵台数控制部105对式(4)以及式(5)加以评价来进行“减少台数条件1”以及“减少台数条件2”的判定(步骤S6)。然后，泵台数控制部105在满足两者的条件时(步骤S6＝是)，停止当前处于启动的2次泵20当中的1台，减少2次泵20的台数(步骤S7)。Next, the number-of-pumps control part 105 evaluates Formula (4) and Formula (5), and performs determination of "the number reduction condition 1" and "the number reduction condition 2" (step S6). Then, when both conditions are satisfied (step S6=Yes), the pump number control unit 105 stops one of the currently activated secondary pumps 20, and reduces the number of secondary pumps 20 (step S7).

在比较的结果是“减少台数条件1”以及“减少台数条件2”当中的任一条件不满足的情况下(步骤S6＝否)，前进至步骤S8的处理。As a result of the comparison, if any one of the "number reduction condition 1" and "number reduction condition 2" is not satisfied (step S6=NO), the process proceeds to step S8.

最后，泵台数控制装置50通过给定的方法来判定热源系统是否因使用者等的操作而停止。在热源系统的运转停止的情况下(步骤S8＝是)，本处理流程结束。在运转继续的情况下(步骤S8＝否)，反复从步骤S1起的处理。Finally, the number-of-pumps control device 50 determines whether or not the heat source system is stopped due to an operation by a user or the like by a predetermined method. When the operation of the heat source system is stopped (step S8=YES), this processing flow ends. When the operation is continued (step S8 = No), the processing from step S1 is repeated.

说明本实施方式的效果。例如，在空调机的阀因负荷的下降而紧缩，系统的压损大的“热源系统状态1”下，1台2次泵20处于运转中，此时的喷出流量的测量值为100m³/h。反之，在因负荷的上升而压损变小的“热源系统状态2”下，1台2次泵20处于运转中，喷出流量的测量值仍为100m³/h。而且，使2次泵20的运转台数从1台增加至2台的阈值为100m³/h。Effects of this embodiment will be described. For example, in the "heat source system state 1" in which the valve of the air conditioner is tightened due to a drop in load and the pressure loss of the system is large, one secondary pump 20 is operating, and the measured value of the discharge flow rate at this time is^100m3 /h. Conversely, in the "heat source system state 2" in which the pressure loss decreases due to an increase in load, one secondary pump 20 is in operation, and the measured value of the discharge flow rate is still 100 m³ /h. Furthermore, the threshold for increasing the number of secondary pumps 20 to be operated from one to two is 100 m³ /h.

此时，在“热源系统状态1”下由于压损较大，因此若不管是否以接近最大值的频率使2次泵20工作都假定喷出流量的测量值为100m³/h，则按照预先设定的阈值将2次泵20的运转台数设为2台可以认为是适当的控制。另一方面，在“热源系统状态2”下由于压损较小，因此例如以最大频率的一半左右的频率使2次泵20工作而得到100m³/h的流量。在此情况下，增加2次泵20的运转台数未必适当，若增加当前正在工作的2次泵20的频率，则也有可能能够提供负载装置所要求的流量。在这样的情况下，在仅将流量用于台数增减的判断的现有方法中，会增加2次泵的台数。泵的增加台数会给流经系统的热介质的压力、流量带来大的变化。At this time, since the pressure loss is large in the "heat source system state 1", if the measured value of the discharge flow rate is assumed to be 100m³ /h regardless of whether the secondary pump 20 is operated at a frequency close to the maximum value, then according to the preset As for the set threshold value, setting the operating number of the secondary pumps 20 to two can be regarded as appropriate control. On the other hand, in the "heat source system state 2", since the pressure loss is small, for example, the secondary pump 20 is operated at a frequency about half of the maximum frequency to obtain a flow rate of 100 m³ /h. In this case, it is not necessarily appropriate to increase the number of operating secondary pumps 20 , and increasing the frequency of the currently operating secondary pumps 20 may provide the flow rate required by the load device. In such a case, in the conventional method of using only the flow rate for determining the increase or decrease in the number of pumps, the number of secondary pumps is increased. The increase in the number of pumps will bring about a big change in the pressure and flow of the heat medium flowing through the system.

根据本实施方式，在包含系统的压损信息的实际的流量的测量值的基础上，还进行基于频率指令值的判断，由此无需知晓压损等设备的详细情况便能够进行2次泵20的台数增减。另外，通过使用泵频率指令值来判断台数增减，能够进行考虑了泵的余力的2次泵20的增减，例如，能够防止本来泵的能力有富余却增加台数这样的控制，因此变得不易发生泵的台数增减，较之于现有方法，能实现更稳定的热源系统的运转。同样地，在减少泵的台数时，也能防止本来能够通过降低频率来进一步降低泵的能力却减少台数的情况。According to this embodiment, in addition to the measured value of the actual flow rate including the pressure loss information of the system, the determination based on the frequency command value is also performed, so that the secondary pump 20 can be performed without knowing the details of the equipment such as the pressure loss. The number of units increases or decreases. In addition, by using the pump frequency command value to determine the increase or decrease in the number, the increase or decrease of the secondary pump 20 can be performed in consideration of the spare capacity of the pump. The increase and decrease in the number of pumps is less likely to occur, and a more stable operation of the heat source system can be realized compared with conventional methods. Similarly, when the number of pumps is reduced, it is possible to prevent the number of pumps from being reduced even though the capacity of the pumps can be further reduced by lowering the frequency.

<变形例><Modification>

作为本实施方式的变形例，也能够取代热介质的流量而使用负载40所需的热负荷。以下，参照图4～5来说明变形例。As a modified example of the present embodiment, instead of the flow rate of the heat medium, a thermal load required for the load 40 may be used. Hereinafter, modifications will be described with reference to FIGS. 4 to 5 .

图4是本实施方式的变形例的热源系统的概略图。Fig. 4 is a schematic diagram of a heat source system according to a modified example of the present embodiment.

该变形例的热源系统具备温度计22和温度计23。其他构成与第一实施方式相同。The heat source system of this modified example includes a thermometer 22 and a thermometer 23 . Other configurations are the same as those of the first embodiment.

温度计22设置在负载40的入口附近。温度计22测量向负载40供给的热介质的温度。The thermometer 22 is provided near the inlet of the load 40 . The thermometer 22 measures the temperature of the heat medium supplied to the load 40 .

温度计23设置在负载40的出口附近。温度计23测量从负载40向热源机30回流的热介质的温度。The thermometer 23 is provided near the outlet of the load 40 . The thermometer 23 measures the temperature of the heat medium flowing back from the load 40 to the heat source unit 30 .

图5是本实施方式的变形例的泵台数控制装置的功能框图。FIG. 5 is a functional block diagram of a pump number control device according to a modified example of the present embodiment.

该变形例的泵台数控制装置50具备温度获取部110，在取代台数判断流量值获取部101而具备台数判断热负荷获取部111这点上与第一实施方式不同。本实施方式的其他构成与第一实施方式相同。The pump number control device 50 of this modified example includes a temperature acquisition unit 110 and is different from the first embodiment in that a pump number determination heat load acquisition unit 111 is provided instead of the number determination flow value acquisition unit 101 . Other configurations of this embodiment are the same as those of the first embodiment.

温度获取部110获取由温度计22、温度计23测量出的热介质的温度。The temperature acquisition unit 110 acquires the temperature of the heat medium measured by the thermometers 22 and 23 .

台数判断热负荷获取部111从存储部200读出作为预先规定的阈值的热负荷增加台数阈值Lα、热负荷减少台数阈值Lβ。另外，台数判断热负荷获取部111从流量获取部104获取热介质的流量，从温度获取部110获取由温度计22、温度计23测量出的热介质的温度，来计算负载40所需的负荷(热负荷)。热负荷例如能使用下式来计算。The thermal load acquisition unit 111 for determining the number of units reads out the thermal load increase threshold Lα and the thermal load decrease threshold Lβ as predetermined thresholds from the storage unit 200 . In addition, the heat load acquisition unit 111 for determining the number of units acquires the flow rate of the heat medium from the flow rate acquisition unit 104, and acquires the temperature of the heat medium measured by the thermometers 22 and 23 from the temperature acquisition unit 110, and calculates the load (heat load) required by the load 40. load). The heat load can be calculated using the following formula, for example.

热负荷＝热介质的流量×(|回流的热介质的温度一供给的热介质的温度|)×热介质的比热×热介质的比重···(6)Heat load = flow rate of heat medium × (|temperature of reflowed heat medium - temperature of supplied heat medium|) x specific heat of heat medium x specific gravity of heat medium...(6)

在此，“热介质的流量”是流量计21测量出的值，是台数判断热负荷获取部111从流量获取部104获取到的值。“回流的热介质的温度”是温度计23测量出的温度，是台数判断热负荷获取部111从温度获取部110获取到的值。“供给的热介质的温度”是温度计22测量出的温度，是台数判断热负荷获取部111从温度获取部110获取到的值。关于热介质的比热以及热介质的比重，预先记录在存储部200中，台数判断热负荷获取部111从存储部200读出这些值。Here, “the flow rate of the heat medium” is a value measured by the flow meter 21 , and is a value obtained by the number determination heat load acquisition unit 111 from the flow rate acquisition unit 104 . The “temperature of the heat medium to be recirculated” is the temperature measured by the thermometer 23 and is a value obtained by the number-of-discrimination thermal load acquisition unit 111 from the temperature acquisition unit 110 . The “temperature of the supplied heat medium” is the temperature measured by the thermometer 22 and is a value acquired by the number-of-discrimination thermal load acquisition unit 111 from the temperature acquisition unit 110 . The specific heat of the heat medium and the specific gravity of the heat medium are previously recorded in the storage unit 200 , and the number determination heat load acquisition unit 111 reads these values from the storage unit 200 .

在本实施方式中，在由台数判断热负荷获取部111计算出的热负荷、由台数判断频率值获取部102获取到的泵的频率满足给定的条件时，泵台数控制部105增加泵的运转台数。具体而言，在满足以下两个条件的情况下，增加泵的运转台数。In the present embodiment, when the thermal load calculated by the number-judging heat-load acquiring unit 111 and the frequency of the pumps acquired by the number-judging frequency value acquiring unit 102 satisfy a given condition, the pump number control unit 105 increases the pump frequency. Number of running units. Specifically, when the following two conditions are satisfied, the number of operating pumps is increased.

<增加台数条件1-1：基于热负荷的判断><Conditions for increasing the number of units 1-1: Judgment based on thermal load>

热负荷≥Lα···(7)Heat load ≥ Lα···(7)

<增加台数条件2：基于频率的判断><Condition 2 for increasing the number of units: Judgment based on frequency>

台数判断频率值≥Fα···(8)Number of units to determine the frequency value ≥ Fα···(8)

另外，泵台数控制部105在热负荷、泵的频率满足给定的条件时减少泵的运转台数。具体而言，在满足以下两个条件的情况下减少泵的运转台数。In addition, the number-of-pumps control unit 105 reduces the number of pumps to operate when the thermal load and the frequency of the pumps satisfy predetermined conditions. Specifically, the number of pumps to operate is reduced when the following two conditions are satisfied.

<减少台数条件1-1：基于热负荷的判断><Conditions for reducing the number of units 1-1: Judgment based on thermal load>

热负荷≤Lβ···(9)Heat load≤Lβ···(9)

<减少台数条件2：基于频率的判断><Number reduction condition 2: Judgment based on frequency>

台数判断频率值≤Fβ···(10)The number of units to determine the frequency value ≤ Fβ···(10)

在该变形例中，增加台数条件1-1以及减少台数条件1-1与第一实施方式不同。关于增加台数条件2以及减少台数条件2，与第一实施方式相同。In this modified example, the number increase condition 1-1 and the number decrease condition 1-1 are different from those of the first embodiment. The number increase condition 2 and the number decrease condition 2 are the same as those in the first embodiment.

说明处理流程。在该变形例中，在图3的步骤S1中，除了流量获取部104获取流量计21测量出的流量之外，温度获取部110还获取温度计22、温度计23测量出的热介质的温度。另外，在步骤S2中，台数判断热负荷获取部111读出存储在存储部200中的阈值Lα、Lβ。另外，台数判断热负荷获取部111从流量获取部104获取热介质的流量，从温度获取部110获取向负载40供给的热介质的温度、以及从负载40向热源机30回流的热介质的温度。然后，台数判断热负荷获取部111根据式(6)来计算热负荷。另外，在步骤S4中，泵台数控制部105进行上述“增加台数条件1-1”以及“增加台数条件2”的判定。另外，在步骤S6中，泵台数控制部105进行上述“减少台数条件1-1”以及“减少台数条件2”的判定。本变形例中的其他处理步骤与第一实施方式相同。Describe the processing flow. In this modification, in step S1 of FIG. 3 , in addition to the flow rate measured by the flow meter 21 obtained by the flow rate obtaining unit 104 , the temperature obtaining unit 110 also obtains the temperature of the heat medium measured by the thermometers 22 and 23 . In addition, in step S2 , the number determination heat load acquisition unit 111 reads the threshold values Lα, Lβ stored in the storage unit 200 . In addition, the number determination heat load acquisition unit 111 acquires the flow rate of the heat medium from the flow rate acquisition unit 104 , and acquires the temperature of the heat medium supplied to the load 40 and the temperature of the heat medium flowing back from the load 40 to the heat source unit 30 from the temperature acquisition unit 110 . . Then, the number determination thermal load acquisition unit 111 calculates the thermal load according to the formula (6). In addition, in step S4, the number-of-pumps control part 105 performs determination of said "number-increase condition 1-1" and "number-increase condition 2". In addition, in step S6, the number-of-pumps control part 105 performs determination of said "number reduction condition 1-1" and "number-reduction condition 2". Other processing steps in this modified example are the same as those in the first embodiment.

本实施方式以及变形例中用到的Gα、Gβ、Fα、Fβ、Lα、Lβ的各阈值是通过实验或模拟等预先规定的值。The respective threshold values of Gα, Gβ, Fα, Fβ, Lα, and Lβ used in the present embodiment and modifications are predetermined values through experiments, simulations, or the like.

<第二实施方式><Second Embodiment>

以下，参照图6～9来说明本发明的第二实施方式的热源系统。Hereinafter, a heat source system according to a second embodiment of the present invention will be described with reference to FIGS. 6 to 9 .

第二实施方式涉及用于在第一实施方式的基础上防止泵的台数增减的反复从而进行更稳定的泵的运转的实施方式。The second embodiment relates to an embodiment for performing more stable pump operation by preventing repetition of increase and decrease in the number of pumps in addition to the first embodiment.

图6是本实施方式的泵台数控制装置的功能框图。FIG. 6 is a functional block diagram of the pump number control device according to the present embodiment.

本实施方式的泵台数控制装置50在具备泵压头获取部107这点上与第一实施方式不同。本实施方式的其他构成与第一实施方式相同。The pump number control device 50 of this embodiment differs from the first embodiment in that it includes a pump pressure head acquisition unit 107 . Other configurations of this embodiment are the same as those of the first embodiment.

泵压头获取部107基于存储部200所保存的Q-H特性来获取2次泵20的当前运转中的2次泵20的泵压头、2次泵增减后的泵压头。在此，所谓泵压头，是指泵的扬程。另外，所谓Q-H特性，是指表示使泵以最大频率进行动作时的喷出流量与泵压头的关系的泵的性能曲线。图7中示出Q-H特性的一例。一般而言，泵的喷出流量(Q)和泵压头(H)处于若喷出流量增加则泵压头减少的关系，根据泵的种类，该Q-H特性描出不同的轨道。存储部200中存储有表示在热源系统中使用的2次泵20的Q-H相关关系的Q-H特性，泵压头获取部107使用该Q-H特性，来获取台数增减前后的平均每台的2次泵20的喷出流量所对应的泵压头。The pump head acquisition unit 107 acquires the pump head of the secondary pump 20 currently in operation of the secondary pump 20 and the pump head after the increase or decrease of the secondary pump based on the Q-H characteristic stored in the storage unit 200 . Here, the so-called pump head refers to the lift of the pump. In addition, the Q-H characteristic refers to a pump performance curve showing the relationship between the discharge flow rate and the pump head when the pump is operated at the maximum frequency. An example of Q-H characteristics is shown in FIG. 7 . In general, the discharge flow rate (Q) of the pump and the pump head (H) are in a relationship that the pump head decreases as the discharge flow rate increases, and this Q-H characteristic draws different trajectories depending on the type of pump. The storage unit 200 stores Q-H characteristics representing the Q-H correlation of the secondary pumps 20 used in the heat source system, and the pump pressure head acquisition unit 107 uses the Q-H characteristics to acquire the average secondary pumps per unit before and after the increase or decrease in the number of units. The pump head corresponding to the discharge flow rate of 20.

接下来，更具体地说明泵压头的求取方法。首先，针对以泵的增加台数为例来求取泵压头时所使用的各符号等进行说明。Next, the method of obtaining the pump pressure head will be described more specifically. First, the symbols and the like used when calculating the pump pressure head are described by taking the number of pumps to be increased as an example.

图8A以及图8B是表示将2次泵20的运转台数从1台增加至2台时的变化的图。以下，将从最初起处于运转状态的2次泵20记为泵20-1，将增加台数的第2台的2次泵20记为泵20-2。8A and 8B are diagrams showing changes when the number of secondary pumps 20 operated is increased from one to two. Hereinafter, the secondary pump 20 that is in operation from the beginning is referred to as a pump 20-1, and the second secondary pump 20 whose number is increased is referred to as a pump 20-2.

图8A是1台运转状态的图。将1台泵20-1所压送的每单位时间的流量设为GA，将全部的泵20-1所压送的每单位时间的总流量设为GinA。在该图中，运转台数为1台，因此GinA＝GA。另外，将泵1的频率设为fA，将泵20-1的压头设为HA。Fig. 8A is a diagram showing the operating state of one unit. Let the flow rate per unit time pumped by one pump 20 - 1 be GA, and the total flow rate per unit time pumped by all the pumps 20 - 1 be GinA. In this figure, since the number of operating machines is one, GinA=GA. In addition, let the frequency of the pump 1 be fA, and let the head of the pump 20-1 be HA.

图8B是2台运转状态的图。将泵20-1以及泵20-2各自所压送的平均每台泵的每单位时间的流量设为GB，将由2台泵20-1以及泵20-2压送的每单位时间的总流量设为GinB。Fig. 8B is a diagram of the operating state of two units. Let the average flow rate per unit time of each pump pumped by the pump 20-1 and the pump 20-2 be GB, and the total flow rate per unit time pumped by the two pumps 20-1 and the pump 20-2 Set to GinB.

在该图中，运转台数为2台，因此GinB＝GB×2。另外，将泵20-1以及泵20-2的频率设为fB，将泵20-1以及泵20-2的泵压头设为HB。也就是，在图8B中，泵台数控制装置50与运转台数无关地进行控制，使得处于运转状态的2次泵20各自成为彼此相同的频率。另外，泵台数控制装置50在增减2次泵20的台数的情况下，进行控制以使在增减前后总流量(GinA)和泵压头(HA)不变。这些条件是在第一～第四实施方式中公共的前提条件。In this figure, since the number of operating units is two, GinB=GB×2. In addition, let the frequency of the pump 20-1 and the pump 20-2 be fB, and let the pump head of the pump 20-1 and the pump 20-2 be HB. That is, in FIG. 8B , the pump number control device 50 controls the secondary pumps 20 in the operating state to have the same frequency as each other regardless of the operating number. In addition, the pump number control device 50 controls the total flow rate (GinA) and the pump head (HA) before and after the increase or decrease when increasing or decreasing the number of the secondary pumps 20 . These conditions are preconditions common to the first to fourth embodiments.

若将这些内容汇总，则从n台增加至n+m台后的各值能够表示如下。When these contents are put together, each value after increasing from n units to n+m units can be expressed as follows.

总流量：GinB＝GinA平均每台的喷出流量：GB＝(n/(n+m))GATotal flow: GinB=GinA The average ejection flow per unit: GB=(n/(n+m))GA

平均每台的泵压头：HB＝HAAverage pump pressure head per unit: HB=HA

泵频率：fB(在运转中的全部泵中相同)Pump frequency: fB (same for all pumps in operation)

接下来，说明求取泵压头的方法。将2次泵20以频率1进行运转而得到喷出流量1。首先，使泵以最大频率运转时的喷出流量能够用喷出流量1乘以将最大频率除以频率1而得到的值来求取。接下来，使用所求出的最大频率的喷出流量来读取Q-H特性，求取与使泵以最大频率运转时的喷出流量对应的泵压头。接下来，将所求出的泵压头与当前的频率1相对于泵最大频率的比例的平方进行相乘。如此求出的值为泵压头。Next, the method of obtaining the pump pressure head will be described. The discharge flow rate 1 is obtained by operating the secondary pump 20 at frequency 1 . First, the discharge flow rate when the pump is operated at the maximum frequency can be obtained by multiplying the discharge flow rate 1 by a value obtained by dividing the maximum frequency by frequency 1 . Next, the Q-H characteristic is read using the obtained discharge flow rate at the maximum frequency, and the pump head corresponding to the discharge flow rate when the pump is operated at the maximum frequency is obtained. Next, the determined pump head is multiplied by the square of the ratio of the current frequency 1 to the pump maximum frequency. The value thus obtained is the pump head.

首先，通过以下的式(11)来求取增加台数许可泵压头(HB′)。First, the pump head (HB') allowed to increase the number of units is obtained by the following equation (11).

【数学式2】【Mathematical formula 2】

${{\mathrm{<span><span>H</span>h</span>}}_{\mathrm{<span><span>B</span>B</span>}}}^{<span><span>\&prime;</span>\&prime;</span>}<span><span>=</span>=</span>{\mathrm{<span><span>F</span>f</span>}}_{<span><span>(</span>(</span>\frac{\mathrm{<span><span>n</span>no</span>}}{\mathrm{<span><span>n</span>no</span>}<span><span>+</span>+</span>\mathrm{<span><span>m</span>m</span>}}{\mathrm{<span><span>G</span>G</span>}}_{\mathrm{<span><span>A</span>A</span>}}\frac{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>m</span>m</span>}\mathrm{<span><span>a</span>a</span>}\mathrm{<span><span>x</span>x</span>}}}{{\mathrm{<span><span>F</span>f</span>}}_{\mathrm{<span><span>\&beta;</span>\&beta;</span>}}}<span><span>)</span>)</span>}<span><span>\&times;</span>\&times;</span>{<span><span>(</span>(</span>\frac{{\mathrm{<span><span>F</span>f</span>}}_{\mathrm{<span><span>\&beta;</span>\&beta;</span>}}}{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>m</span>m</span>}\mathrm{<span><span>a</span>a</span>}\mathrm{<span><span>x</span>x</span>}}}<span><span>)</span>)</span>}^{\mathrm{<span><span>2</span>2</span>}}<span><span>...</span>...</span><span><span>(</span>(</span>\mathrm{<span><span>11</span>11</span>}<span><span>)</span>)</span>$

在此，右边的第1项F(x)示出了根据Q-H特性所示的喷出流量来求取泵压头的函数。另外，Fβ是在第一实施方式中说明的频率减少台数阈值。另外，fmax是各2次泵20的最大频率(泵最大频率)。使用频率减少台数阈值Fβ而求出的该泵压头意味着从增加了1台2次泵20的状态起减少1台时的泵压头(增加台数许可泵压头)。Here, the first term F(x) on the right shows a function for obtaining the pump head from the discharge flow rate indicated by the Q-H characteristic. In addition, Fβ is the frequency decrease number threshold value described in the first embodiment. In addition, fmax is the maximum frequency of each secondary pump 20 (pump maximum frequency). The pump pressure head obtained by using the frequency decrease number threshold value Fβ means the pump pressure head when one secondary pump 20 is reduced from the state in which one secondary pump 20 is added (increase number allowable pump pressure head).

另外，泵压头获取部107同样地通过下式(12)来求取泵增加后的状态下的泵压头(HB)。在此，使用增加前的频率、流量是因为，如上所述使2次泵20增加以使泵压头不变，因此该增加后的泵压头等于当前(增加台数前)的泵压头。In addition, the pump head obtaining unit 107 similarly obtains the pump head (HB) in the state where the pump has been increased by the following equation (12). Here, the frequency and flow rate before the increase are used because the pump head after the increase is equal to the current pump head (before the increase in number) since the secondary pump 20 is increased as described above so that the pump head does not change.

【数学式3】【Mathematical formula 3】

${\mathrm{<span><span>H</span>h</span>}}_{\mathrm{<span><span>B</span>B</span>}}<span><span>=</span>=</span>{\mathrm{<span><span>F</span>f</span>}}_{<span><span>(</span>(</span>{\mathrm{<span><span>G</span>G</span>}}_{\mathrm{<span><span>A</span>A</span>}}\frac{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>max</span>max</span>}}}{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>A</span>A</span>}}}<span><span>)</span>)</span>}<span><span>\&times;</span>\&times;</span>{<span><span>(</span>(</span>\frac{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>A</span>A</span>}}}{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>m</span>m</span>}\mathrm{<span><span>a</span>a</span>}\mathrm{<span><span>x</span>x</span>}}}<span><span>)</span>)</span>}^{\mathrm{<span><span>2</span>2</span>}}<span><span>...</span>...</span><span><span>(</span>(</span>\mathrm{<span><span>12</span>12</span>}<span><span>)</span>)</span>$

然后，泵台数控制部105使用这些值，除了第一实施方式中的2个增加台数条件之外，还进行如下条件的判定。Then, the number-of-pumps control unit 105 uses these values to perform determination of the following conditions in addition to the two conditions for increasing the number of pumps in the first embodiment.

<增加台数条件3：基于泵压头的判断><Condition 3 for increasing the number of units: Judgment based on pump pressure head>

增加台数许可泵压头<增加台数后的泵压头···(13)Permissible pump pressure head after increasing the number of units<Pump pressure head after increasing the number of units...(13)

也就是，若在“增加台数条件1”、“增加台数条件2”的基础上还为增加台数许可泵压头以上，则泵台数控制部105增加2次泵20的运转台数。增加台数许可泵压头是使用频率减少台数阈值而求出的值，是成为在泵的运转台数增加后减少泵的台数的基准的值。考虑到即使增加了运转台数，若增加台数后的泵压头也仍然低于该值，则有可能会再次减少泵的台数，为了避免这样的不必要的处理，在本实施方式中追加这样的条件。That is, if the number-increase condition 1 and the "number-increase condition 2" are equal to or more than the allowable pump head, the pump number control unit 105 increases the number of secondary pumps 20 to operate. The number-increase-permitted pump head is a value obtained by using the frequency decrease threshold value, and is a value serving as a reference for reducing the number of pumps after the number of pumps in operation has increased. Considering that even if the number of operating units is increased, if the pump pressure head after the increase is still lower than this value, the number of pumps may be reduced again. In order to avoid such unnecessary processing, such a method is added in this embodiment. condition.

接下来，说明泵压头获取部107求取减少台数许可泵压头的方法。减少台数许可泵压头是成为在泵的运转台数减少后增加泵的台数的基准的值。Next, a method for obtaining the pump head permissible by the pump head acquisition unit 107 will be described. The number-reduction allowable pump head is a value to serve as a reference for increasing the number of pumps after the number of operating pumps is reduced.

与增加台数时同样地，将2次泵20从n台减少至n-m台后的各量能够表示如下。Similar to the case of increasing the number, each amount after reducing the number of secondary pumps 20 from n to n-m can be expressed as follows.

送水流量：GinB＝GinA平均每台的送水流量：GB＝(n/(n-m))GAWater delivery flow: GinB=GinA Average water delivery flow per unit: GB=(n/(n-m))GA

平均每台的泵压头：HB＝HAAverage pump pressure head per unit: HB=HA

泵频率：fB(在运转中的全部泵中相同)Pump frequency: fB (same for all pumps in operation)

减少台数许可泵压头能够通过以下的式(14)来求取。The number-reduced permissible pump head can be obtained by the following equation (14).

【数学式4】【Mathematical formula 4】

${{\mathrm{<span><span>H</span>h</span>}}_{\mathrm{<span><span>B</span>B</span>}}}^{<span><span>\&prime;</span>\&prime;</span>}<span><span>=</span>=</span>{\mathrm{<span><span>F</span>f</span>}}_{<span><span>(</span>(</span>\frac{\mathrm{<span><span>n</span>no</span>}}{\mathrm{<span><span>n</span>no</span>}<span><span>-</span>-</span>\mathrm{<span><span>m</span>m</span>}}{\mathrm{<span><span>G</span>G</span>}}_{\mathrm{<span><span>A</span>A</span>}}\frac{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>m</span>m</span>}\mathrm{<span><span>a</span>a</span>}\mathrm{<span><span>x</span>x</span>}}}{{\mathrm{<span><span>F</span>f</span>}}_{\mathrm{<span><span>\&alpha;</span>\&alpha;</span>}}}<span><span>)</span>)</span>}<span><span>\&times;</span>\&times;</span>{<span><span>(</span>(</span>\frac{{\mathrm{<span><span>F</span>f</span>}}_{\mathrm{<span><span>\&alpha;</span>\&alpha;</span>}}}{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>m</span>m</span>}\mathrm{<span><span>a</span>a</span>}\mathrm{<span><span>x</span>x</span>}}}<span><span>)</span>)</span>}^{\mathrm{<span><span>2</span>2</span>}}<span><span>...</span>...</span><span><span>(</span>(</span>\mathrm{<span><span>14</span>14</span>}<span><span>)</span>)</span>$

Fα是在第一实施方式中说明的频率增加台数阈值。另外，泵压头获取部107根据式(12)来求取泵减少台数后的状态下的泵压头(HB)。Fα is the threshold value for the number of frequency increase stations described in the first embodiment. In addition, the pump head acquisition unit 107 obtains the pump head (HB) in a state in which the number of pumps has been reduced according to Equation (12).

减少台数后的泵压头相对于泵减少台数前的泵压头无变化，因此能够根据式(12)来求取。Since the pump pressure head after the reduction in the number of pumps does not change from that before the reduction in the number of pumps, it can be obtained from Equation (12).

然后，泵台数控制部105使用这些值，在第一实施方式中的2个减少台数条件的基础上，还进行如下条件的判定。Then, the number-of-pumps control unit 105 uses these values to determine the following conditions in addition to the two conditions for reducing the number of pumps in the first embodiment.

<减少台数条件3：基于泵压头的判断><Condition 3 for reducing the number of units: Judgment based on pump head>

减少台数许可泵压头＞减少台数后的泵压头···(15)Permissible pump head after reducing the number of units > Pump head after reducing the number of units...(15)

也就是，若在“减少台数条件1”、“减少台数条件2”的基础上还为减少台数许可泵压头以下，则泵台数控制部105减少2次泵20的运转台数。该条件与增加台数的情况同样地，对在泵的运转台数减少后有可能再次增加泵的台数的情况加以了考虑。That is, if the pump pressure head is lower than the allowable pump head in addition to the "number reduction condition 1" and "number reduction condition 2", the pump number control unit 105 reduces the operating number of the secondary pumps 20 . This condition takes into consideration that the number of pumps may be increased again after the number of pumps in operation decreases, similarly to the case of increasing the number of pumps.

图9是表示本实施方式的泵台数控制装置的处理流程的图。FIG. 9 is a diagram showing a processing flow of the pump number control device according to the present embodiment.

使用图9的处理流程来说明泵台数控制装置50增减2次泵20的运转台数的处理。针对与图3相同的处理，赋予相同的符号来进行说明。The process of increasing or decreasing the number of secondary pumps 20 operated by the pump number control device 50 will be described using the process flow of FIG. 9 . The same reference numerals will be assigned to the same processing as in FIG. 3 for description.

首先，从步骤S1至步骤S3与第一实施方式相同。也就是，流量获取部104获取由流量计21测量出的流量，台数判断流量值获取部101获取阈值Gα、Gβ、台数判断流量值，台数判断频率值获取部102获取阈值Fα、Fβ、台数判断频率值。First, steps S1 to S3 are the same as those in the first embodiment. That is, the flow rate acquisition unit 104 acquires the flow rate measured by the flowmeter 21, the unit number determination flow value acquisition unit 101 acquires the threshold values Gα, Gβ, and the unit number determination flow value, and the unit number determination frequency value acquisition unit 102 acquires the threshold values Fα, Fβ, and the number determination value. frequency value.

接下来，泵压头获取部107根据式(12)来求取泵台数增减后的泵压头，根据式(11)来求取增加台数许可泵压头，根据式(14)来求取减少台数许可泵压头(步骤S10)。Next, the pump pressure head acquisition unit 107 calculates the pump pressure head after the increase or decrease of the number of pumps according to the formula (12), calculates the pump pressure head allowed by the number of pumps according to the formula (11), and calculates the pump pressure head according to the formula (14). Reduce the number of allowable pump heads (step S10).

接下来，泵台数控制部105进行“增加台数条件1”、“增加台数条件2”和“增加台数条件3”的判定(步骤S11)。然后，泵台数控制部105在满足全部三个条件时(步骤S11＝是)，将2次泵20的运转台数增加1台(步骤S5)。Next, the number-of-pumps control part 105 performs determination of "number increase condition 1", "number increase condition 2", and "number increase condition 3" (step S11). Then, when all three conditions are satisfied (step S11=Yes), the pump number control part 105 increases the number of operation of the secondary pump 20 by 1 (step S5).

在比较的结果是“增加台数条件1”、“增加台数条件2”和“增加台数条件3”当中的任一条件不满足的情况下(步骤S11＝否)，前进至步骤S12的处理。As a result of the comparison, if any of the "increase number condition 1", "increase number condition 2" and "increase number condition 3" is not satisfied (step S11=NO), proceed to step S12.

接下来，泵台数控制部105进行“减少台数条件1”、“减少台数条件2”和“减少台数条件3”的判定(步骤S12)。然后，泵台数控制部105在满足全部三个条件时(步骤S12＝是)，将2次泵20的运转台数减少1台(步骤S7)。Next, the number-of-pumps control part 105 performs determination of "number reduction condition 1", "number reduction condition 2", and "number reduction condition 3" (step S12). Then, when all three conditions are satisfied (step S12=YES), the pump number control part 105 reduces the number of operation of the secondary pump 20 by 1 (step S7).

在比较的结果是“减少台数条件1”、“减少台数条件2”和“减少台数条件3”当中的任一条件不满足的情况下(步骤S12＝否)，前进至步骤S8的处理。步骤S8的处理与图3相同。也就是，反复从步骤S1起的处理直到热源系统停止为止。As a result of the comparison, if any of the "number reduction condition 1", "number reduction condition 2" and "number reduction condition 3" is not satisfied (step S12=No), the process proceeds to step S8. The processing in step S8 is the same as that in FIG. 3 . That is, the process from step S1 is repeated until the heat source system stops.

在第一实施方式中，示出了利用所测量出的流量以及泵频率的2次泵20的增加台数以及减少台数的判断基准。但是，仅通过第一实施方式的方法，由于并未考虑泵增加台数或减少台数后的状态，因此有可能再次进行增加台数以及减少台数的判定，反复增加台数和减少台数。In the first embodiment, the criteria for judging the number of secondary pumps 20 to be increased and decreased using the measured flow rate and pump frequency are shown. However, only the method of the first embodiment does not take into account the increase or decrease of the number of pumps, so the determination of the increase or decrease may be performed again, and the increase and decrease may be repeated.

根据本实施方式，在增加台数以及减少台数判断时，除了台数增减后的流量测量值和泵频率之外，还将增加台数(减少台数)后的泵运转状态与根据Q-H特性而估算出的减少台数(增加台数)阈值的泵压头进行比较后进行台数增减，由此能够防止增加台数与减少台数的反复。According to this embodiment, when judging whether to increase or decrease the number of units, in addition to the measured flow rate and pump frequency after the increase or decrease in the number of units, the operation status of the pumps after the increase (decrease in the number) and the value estimated from the Q-H characteristic are also used. By comparing the number of pump heads that decrease (increase the number) with the threshold value, the number increases and decreases, thereby preventing repetition of increasing the number and decreasing the number.

本实施方式也能够与第一实施方式的变形例组合。This embodiment can also be combined with the modified example of the first embodiment.

<第三实施方式><Third Embodiment>

以下，参照图10～11来说明本发明的第三实施方式的热源系统。Hereinafter, a heat source system according to a third embodiment of the present invention will be described with reference to FIGS. 10 to 11 .

第三实施方式与第二实施方式同样地，涉及用于在第一实施方式的基础上防止泵的台数增减的反复而进行更稳定的泵的运转的实施方式。Like the second embodiment, the third embodiment relates to an embodiment for performing more stable pump operation by preventing repetition of increase and decrease in the number of pumps in the first embodiment.

图10是本实施方式的泵台数控制装置50的功能框图。FIG. 10 is a functional block diagram of the pump number control device 50 according to this embodiment.

本实施方式的泵台数控制装置50在具备泵频率估算值获取部108这点上与第一实施方式不同。本实施方式的其他构成与第一实施方式相同。The pump number control device 50 of this embodiment differs from the first embodiment in that it includes a pump frequency estimated value acquisition unit 108 . Other configurations of this embodiment are the same as those of the first embodiment.

泵频率估算值获取部108获取作为2次泵20的台数增减后的频率的估算值的增加台数后泵频率估算值以及减少台数后泵频率估算值。The pump frequency estimated value acquisition unit 108 acquires the increased pump frequency estimated value and the decreased pump frequency estimated value as the estimated frequency after the increase or decrease in the number of secondary pumps 20 .

具体而言，增加台数后的泵压头能够根据式(16)来求取。Specifically, the pump head after increasing the number of pumps can be obtained from Equation (16).

【数学式5】【Mathematical formula 5】

${\mathrm{<span><span>H</span>h</span>}}_{\mathrm{<span><span>B</span>B</span>}}<span><span>=</span>=</span>{\mathrm{<span><span>F</span>f</span>}}_{<span><span>(</span>(</span>\frac{\mathrm{<span><span>n</span>no</span>}}{\mathrm{<span><span>n</span>no</span>}<span><span>+</span>+</span>\mathrm{<span><span>m</span>m</span>}}{\mathrm{<span><span>G</span>G</span>}}_{\mathrm{<span><span>A</span>A</span>}}\frac{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>m</span>m</span>}\mathrm{<span><span>a</span>a</span>}\mathrm{<span><span>x</span>x</span>}}}{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>B</span>B</span>}}}<span><span>)</span>)</span>}<span><span>\&times;</span>\&times;</span>{<span><span>(</span>(</span>\frac{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>B</span>B</span>}}}{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>m</span>m</span>}\mathrm{<span><span>a</span>a</span>}\mathrm{<span><span>x</span>x</span>}}}<span><span>)</span>)</span>}^{\mathrm{<span><span>2</span>2</span>}}<span><span>...</span>...</span><span><span>(</span>(</span>\mathrm{<span><span>16</span>16</span>}<span><span>)</span>)</span>$

也就是，设为得到了在增加台数后的泵频率(fB)下增加台数后的平均每台泵所需的喷出流量((n/n+m)×GA)，基于在此情况下的泵最大频率下的喷出流量，将根据Q-H特性而获取到的泵压头与增加台数后的泵频率(fB)相对于泵最大频率(fmax)的比例的平方相乘，从而得到增加台数后的泵压头(HB)。That is, it is assumed that the average discharge flow rate ((n/n+m)×GA) required by each pump after the number of pumps is increased under the frequency (fB) of the pumps after the number of pumps is increased, based on the The discharge flow rate at the maximum frequency of the pump is multiplied by the pump pressure head obtained according to the Q-H characteristic and the square of the ratio of the increased pump frequency (fB) to the pump maximum frequency (fmax), so as to obtain the increased number of pumps pump head (HB).

另一方面，根据式(16)求出的HB与HA相同(进行台数增减使得HB＝HA)，HA能够使用当前的泵频率、流量测量值、Q-H特性来求取(式(12))。泵频率估算值获取部108利用该关系，根据预先准备的表示频率与泵压头的相关关系的映射图或反函数，来导出满足HB＝HA的频率fB，将该fB设为增加台数后泵频率估算值。On the other hand, HB obtained from Equation (16) is the same as HA (increase or decrease the number of units so that HB=HA), and HA can be obtained using the current pump frequency, flow measurement value, and Q-H characteristics (Equation (12)) . The pump frequency estimated value acquisition unit 108 utilizes this relationship to derive a frequency fB that satisfies HB=HA from a prepared map or an inverse function representing the correlation between the frequency and the pump pressure head, and sets fB as the frequency fB after increasing the number of pumps. frequency estimates.

然后，泵台数控制部105在“增加台数条件1”和“增加台数条件2”的基础上，还进行用于在基于频率的增加台数后不会再次进入减少台数条件的增加台数许可判定(“增加台数条件4”)。Then, the number of pumps control unit 105 also performs an increase number permission judgment for not entering into the number reduction condition again after the number increase based on the frequency on the basis of "number increase condition 1" and "number increase condition 2" (" Increase the number of conditions 4").

<增加台数条件4：基于频率的判断><Condition 4 for increasing the number of units: Judgment based on frequency>

fB＞Fβ···(17)fB>Fβ···(17)

在此，fB是由泵频率估算值获取部108求出的增加台数后泵频率估算值，Fβ是在第一实施方式中说明的频率减少台数阈值。在本实施方式中，由于若在“增加台数条件1”、“增加台数条件2”的基础上增加台数后的频率不高于频率减少台数阈值，则有可能还会减少泵的台数，因此为了防止这种情况，将该条件追加至泵的增加台数判断中。Here, fB is an estimated pump frequency value obtained by the pump frequency estimated value acquisition unit 108 after the number of pumps has been increased, and Fβ is the frequency decrease number threshold value described in the first embodiment. In this embodiment, if the frequency after increasing the number of pumps is not higher than the frequency reduction threshold value on the basis of "number increase condition 1" and "number increase condition 2", it is possible to reduce the number of pumps, so for To prevent this, add this condition to the determination of the number of pumps to be added.

同样地进行减少台数后的判定。泵频率估算值获取部108将减少台数后的平均每台泵的流量、泵最大频率代入式(18)，利用式(18)的值与上述HA相等，根据映射图、反函数等来求取减少台数后泵频率估算值fB。Judgment after reducing the number is performed in the same manner. The pump frequency estimated value acquisition unit 108 substitutes the average flow rate of each pump and the maximum pump frequency after reducing the number of pumps into equation (18), uses the value of equation (18) to be equal to the above-mentioned HA, and obtains it from a map, an inverse function, etc. Estimated pump frequency fB after reducing the number of units.

【数学式6】【Mathematical formula 6】

${\mathrm{<span><span>H</span>h</span>}}_{\mathrm{<span><span>B</span>B</span>}}<span><span>=</span>=</span>{\mathrm{<span><span>F</span>f</span>}}_{<span><span>(</span>(</span>\frac{\mathrm{<span><span>n</span>no</span>}}{\mathrm{<span><span>n</span>no</span>}<span><span>-</span>-</span>\mathrm{<span><span>m</span>m</span>}}{\mathrm{<span><span>G</span>G</span>}}_{\mathrm{<span><span>A</span>A</span>}}\frac{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>m</span>m</span>}\mathrm{<span><span>a</span>a</span>}\mathrm{<span><span>x</span>x</span>}}}{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>B</span>B</span>}}}<span><span>)</span>)</span>}<span><span>\&times;</span>\&times;</span>{<span><span>(</span>(</span>\frac{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>B</span>B</span>}}}{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>m</span>m</span>}\mathrm{<span><span>a</span>a</span>}\mathrm{<span><span>x</span>x</span>}}}<span><span>)</span>)</span>}^{\mathrm{<span><span>2</span>2</span>}}<span><span>...</span>...</span><span><span>(</span>(</span>\mathrm{<span><span>18</span>18</span>}<span><span>)</span>)</span>$

然后，泵台数控制部105在“减少台数条件1”和“减少台数条件2”的基础上，还进行用于在基于频率的减少台数后不会再次进入增加台数条件的减少台数许可判定(“减少台数条件4”)。Then, the number of pumps control unit 105 also performs a reduction permission judgment for not entering the increase condition again after frequency-based reduction of the number (" Reduce the number of conditions 4").

<减少台数条件4：基于频率的判断><Number reduction condition 4: Judgment based on frequency>

fB＜Fα···(19)fB<Fα···(19)

在此，fB是由泵频率估算值获取部108求出的减少台数后泵频率估算值，Fα是在第一实施方式中说明的频率增加台数阈值。也就是，在本实施方式中，由于若在“减少台数条件1”、“减少台数条件2”的基础上减少台数后的频率不为频率增加台数阈值以下，则有可能还会增加泵的台数，因此为了防止这种情况，将该条件追加至泵的减少台数判断中。Here, fB is an estimated pump frequency value obtained by the pump frequency estimated value acquisition unit 108 after the number of pumps has been reduced, and Fα is the frequency increase number threshold value described in the first embodiment. That is, in this embodiment, if the frequency after reducing the number of pumps on the basis of "number reduction condition 1" and "number reduction condition 2" is not below the frequency increase number threshold value, it is possible to increase the number of pumps , so in order to prevent this situation, this condition is added to the determination of the reduction in the number of pumps.

图11是表示本实施方式的泵台数控制装置的处理流程的图。FIG. 11 is a diagram showing a processing flow of the pump number control device according to the present embodiment.

使用图11的处理流程来说明泵台数控制装置50增减2次泵20的运转台数的处理。针对与图3相同的处理，赋予相同的符号来进行说明。The process of increasing or decreasing the number of secondary pumps 20 operated by the pump number control device 50 will be described using the process flow in FIG. 11 . The same reference numerals will be assigned to the same processing as in FIG. 3 for description.

从步骤S1至步骤S3与第一实施方式相同。Step S1 to step S3 are the same as in the first embodiment.

接下来，泵频率估算值获取部108通过映射图、反函数来求取泵台数增减后的泵频率的估算值fB(步骤S13)。Next, the pump frequency estimated value acquisition unit 108 obtains the estimated value fB of the pump frequency after the increase or decrease in the number of pumps using a map or an inverse function (step S13 ).

接下来，泵台数控制部105进行“增加台数条件1”、“增加台数条件2”和“增加台数条件4”的判定(步骤S14)。然后，泵台数控制部105在满足全部三个条件时(步骤S14＝是)，将2次泵20的运转台数增加1台(步骤S5)。Next, the number-of-pumps control part 105 performs determination of "number increase condition 1", "number increase condition 2", and "number increase condition 4" (step S14). Then, when all three conditions are satisfied (step S14=YES), the pump number control part 105 increases the number of operation of the secondary pump 20 by 1 (step S5).

在比较的结果是“增加台数条件1”、“增加台数条件2”和“增加台数条件4”当中的任一条件不满足的情况下(步骤S14＝否)，前进至步骤S15的处理。As a result of the comparison, if any one of the "increase in number condition 1", "increase in number of units condition 2" and "increase in number of units condition 4" is not satisfied (step S14=NO), proceed to step S15.

接下来，泵台数控制部105进行“减少台数条件1”、“减少台数条件2”和“减少台数条件4”的判定(步骤S15)。然后，泵台数控制部105在满足全部三个条件时(步骤S15＝是)，将2次泵20的运转台数减少1台(步骤S7)。Next, the number-of-pumps control part 105 performs determination of "number reduction condition 1", "number reduction condition 2", and "number reduction condition 4" (step S15). Then, when all three conditions are satisfied (step S15=YES), the pump number control part 105 reduces the number of operation of the secondary pump 20 by 1 (step S7).

在比较的结果是“减少台数条件1”、“减少台数条件2”和“减少台数条件3”当中任一条件不满足的情况下(步骤S12＝否)，前进至步骤S8的处理。步骤S8的处理与图3相同。也就是，反复从步骤S1起的处理直到热源系统停止为止。As a result of the comparison, if any of the "number reduction condition 1", "number reduction condition 2" and "number reduction condition 3" is not satisfied (step S12=NO), the process proceeds to step S8. The processing in step S8 is the same as that in FIG. 3 . That is, the process from step S1 is repeated until the heat source system stops.

根据本实施方式，估算增加台数(减少台数)后的泵频率，并将该值与频率减少台数(增加台数)阈值进行比较。然后，在第一实施方式的两个条件的基础上，若增加台数后的泵频率估算值高于频率减少台数阈值，则增加2次泵20的台数。同样，在第一实施方式的两个条件的基础上，若减少台数后的泵频率估算值低于频率增加台数阈值，则减少2次泵20的台数。通过对2次泵20的增减后的频率加以考虑，从而能够防止增加台数与减少台数的反复。According to the present embodiment, the pump frequency after the number of pumps has been increased (the number of pumps has been decreased) is estimated, and this value is compared with the threshold value of the number of pumps whose frequency has been decreased (the number of pumps has been increased). Then, on the basis of the two conditions of the first embodiment, if the estimated value of pump frequency after increasing the number is higher than the frequency decrease threshold value, the number of secondary pumps 20 is increased. Similarly, on the basis of the two conditions of the first embodiment, if the estimated value of pump frequency after the reduced number is lower than the frequency increase threshold value, the number of secondary pumps 20 is reduced. By taking into account the increased and decreased frequency of the secondary pumps 20 , it is possible to prevent the repetition of increasing and decreasing the number of pumps 20 .

本实施方式也能够与第一实施方式的变形例进行组合。This embodiment can also be combined with the modified example of the first embodiment.

<第四实施方式><Fourth Embodiment>

以下，参照图12～14来说明本发明的第四实施方式的热源系统。Hereinafter, a heat source system according to a fourth embodiment of the present invention will be described with reference to FIGS. 12 to 14 .

第四实施方式涉及在第一～三实施方式的基础上对泵效率加以考虑来变更泵的运转台数的实施方式。The fourth embodiment relates to an embodiment in which the number of pumps operated is changed in consideration of pump efficiency in addition to the first to third embodiments.

图12是本实施方式的泵台数控制装置的功能框图。FIG. 12 is a functional block diagram of the pump number control device according to this embodiment.

本实施方式的泵台数控制装置50在具备泵频率估算值获取部108和泵效率获取部109这点上与第一实施方式不同。本实施方式的其他构成与第一实施方式相同。The pump number control device 50 of this embodiment differs from the first embodiment in that it includes a pump frequency estimated value acquisition unit 108 and a pump efficiency acquisition unit 109 . Other configurations of this embodiment are the same as those of the first embodiment.

泵频率估算值获取部108如在第三实施方式中所说明的那样使用映射图、反函数来获取增加台数后泵频率估算值以及减少台数后泵频率估算值。The pump frequency estimated value acquisition unit 108 acquires the increased pump frequency estimated value and the decreased pump frequency estimated value using a map and an inverse function as described in the third embodiment.

泵效率获取部109使用表示由存储部200保存的泵的喷出流量与泵效率的相关关系的图表等，来求取2次泵20的台数增减后的泵效率的估算值。图13中示出使泵以最大频率进行动作时的喷出流量与泵效率的相关关系的一例。图13示出了泵效率根据泵的喷出流量而发生变化的情况。应该理解，若使2次泵20的运转台数进行台数增减，则平均每台的喷出流量会发生变化，因此泵效率也会随之变化。The pump efficiency acquisition unit 109 obtains an estimated value of the pump efficiency after the number of secondary pumps 20 has increased or decreased, using a graph or the like showing the correlation between the discharge flow rate of the pump and the pump efficiency stored in the storage unit 200 . FIG. 13 shows an example of the correlation between the discharge flow rate and the pump efficiency when the pump is operated at the maximum frequency. FIG. 13 shows how the pump efficiency changes according to the discharge flow rate of the pump. It should be understood that if the number of secondary pumps 20 to be operated is increased or decreased, the average discharge flow rate per pump will change, and thus the pump efficiency will also change accordingly.

增加台数前的状态下的平均每台的当前泵效率ηA通过以下的式(20)来求取。The average current pump efficiency ηA per pump in the state before the number of pumps is increased is obtained by the following equation (20).

【数学式7】【Mathematical formula 7】

${\mathrm{<span><span>\&eta;</span>\&eta;</span>}}_{\mathrm{<span><span>A</span>A</span>}}<span><span>=</span>=</span>{\mathrm{<span><span>\&eta;</span>\&eta;</span>}}_{<span><span>(</span>(</span>{\mathrm{<span><span>G</span>G</span>}}_{\mathrm{<span><span>A</span>A</span>}}\frac{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>m</span>m</span>}\mathrm{<span><span>a</span>a</span>}\mathrm{<span><span>x</span>x</span>}}}{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>A</span>A</span>}}}<span><span>)</span>)</span>}<span><span>...</span>...</span><span><span>(</span>(</span>\mathrm{<span><span>20</span>20</span>}<span><span>)</span>)</span>$

在此，η(x)是表示泵的喷出流量与泵效率的关系的函数。Here, η(x) is a function representing the relationship between the discharge flow rate of the pump and the pump efficiency.

另外，同样地，平均每台的增加台数后泵效率ηB通过以下的式(21)来求取。In addition, similarly, the average pump efficiency ηB after increasing the number of pumps is obtained by the following equation (21).

【数学式8】【Mathematical formula 8】

${\mathrm{<span><span>\&eta;</span>\&eta;</span>}}_{\mathrm{<span><span>B</span>B</span>}}<span><span>=</span>=</span>{\mathrm{<span><span>\&eta;</span>\&eta;</span>}}_{<span><span>(</span>(</span>\frac{\mathrm{<span><span>n</span>no</span>}}{\mathrm{<span><span>n</span>no</span>}<span><span>+</span>+</span>\mathrm{<span><span>m</span>m</span>}}{\mathrm{<span><span>G</span>G</span>}}_{\mathrm{<span><span>A</span>A</span>}}\frac{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>max</span>max</span>}}}{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>B</span>B</span>}}}<span><span>)</span>)</span>}<span><span>...</span>...</span><span><span>(</span>(</span>\mathrm{<span><span>21</span>twenty\; one</span>}<span><span>)</span>)</span>$

在此，fB是由泵频率估算值获取部108计算出的增加台数后泵频率估算值。Here, fB is an estimated pump frequency value calculated by the pump frequency estimated value acquisition unit 108 after increasing the number of pumps.

然后，泵台数控制部105在“增加台数条件1”和“增加台数条件2”的基础上，进行基于泵效率的增加台数许可判定(“增加台数条件5”)。Then, the number-of-pumps control unit 105 performs an increase-number permission determination based on pump efficiency ("number-increase condition 5") based on "number-increase condition 1" and "number-increase condition 2".

<增加台数条件5：基于泵效率的判断><Condition 5 for increasing the number of units: Judgment based on pump efficiency>

ηB≥ηA···(22)ηB≥ηA···(22)

也就是，若在“增加台数条件1”、“增加台数条件2”的基础上增加台数后的泵效率不为增加台数前的泵效率以上，则泵台数控制部105不增加台数。That is, if the pump efficiency after increasing the number is not greater than the pump efficiency before increasing the number based on the "number increase condition 1" and "number increase condition 2", the pump number control unit 105 does not increase the number of pumps.

同样地，泵效率获取部109通过以下的式(23)来求取平均每台的减少台数后泵效率。Similarly, the pump efficiency acquisition unit 109 obtains the average reduced pump efficiency per unit by the following equation (23).

【数学式9】【Mathematical formula 9】

${\mathrm{<span><span>\&eta;</span>\&eta;</span>}}_{\mathrm{<span><span>B</span>B</span>}}<span><span>=</span>=</span>{\mathrm{<span><span>\&eta;</span>\&eta;</span>}}_{<span><span>(</span>(</span>\frac{\mathrm{<span><span>n</span>no</span>}}{\mathrm{<span><span>n</span>no</span>}<span><span>-</span>-</span>\mathrm{<span><span>m</span>m</span>}}{\mathrm{<span><span>G</span>G</span>}}_{\mathrm{<span><span>A</span>A</span>}}\frac{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>m</span>m</span>}\mathrm{<span><span>a</span>a</span>}\mathrm{<span><span>x</span>x</span>}}}{{\mathrm{<span><span>f</span>f</span>}}_{\mathrm{<span><span>B</span>B</span>}}}<span><span>)</span>)</span>}<span><span>...</span>...</span><span><span>(</span>(</span>\mathrm{<span><span>23</span>twenty\; three</span>}<span><span>)</span>)</span>$

然后，泵台数控制部105在“减少台数条件1”和“减少台数条件2”的基础上，进行基于泵效率的减少台数许可判定(“减少台数条件5”)。Then, the number-of-pumps control unit 105 performs the permission judgment of reducing the number of pumps based on the pump efficiency ("number-reducing condition 5") based on "number-reducing condition 1" and "condition 2".

<减少台数条件5：基于泵效率的判断><Number reduction condition 5: Judgment based on pump efficiency>

η_B≥η_A···(24)η_B ≥ η_A ···(24)

也就是，若在“减少台数条件1”、“减少台数条件2”的基础上减少台数后的泵效率不为减少台数前的泵效率以上，则泵台数控制部105不减少台数。That is, if the pump efficiency after reducing the number is not greater than the pump efficiency before reducing the number based on the "number reduction condition 1" and "number reduction condition 2", the pump number control unit 105 does not reduce the number of pumps.

在第一～三实施方式中由于并未对泵效率加以考虑，因此有可能对泵进行了台数增减使得在效率差的运转点进行运转。In the first to third embodiments, since pump efficiency is not taken into consideration, there is a possibility that the number of pumps is increased or decreased to operate at an operating point with poor efficiency.

根据本实施方式，通过对泵效率加以考虑，从而能够在抑制功耗的同时增减泵的台数。According to the present embodiment, the number of pumps can be increased or decreased while suppressing power consumption by taking pump efficiency into consideration.

图14是表示本实施方式的泵台数控制装置的处理流程的图。FIG. 14 is a diagram showing a processing flow of the pump number control device according to the present embodiment.

使用图14的处理流程，来说明泵台数控制装置50增减2次泵20的运转台数的处理。针对与图11相同的处理，赋予相同的符号来进行说明。Using the processing flow of FIG. 14 , the processing of increasing or decreasing the number of secondary pumps 20 operated by the pump number control device 50 will be described. The same reference numerals will be assigned to the same processing as in FIG. 11 for description.

从步骤S1至步骤S3与第一～三实施方式相同。下一步骤S13与第三实施方式(图11)相同。Step S1 to step S3 are the same as those in the first to third embodiments. The next step S13 is the same as that of the third embodiment ( FIG. 11 ).

接下来，泵效率获取部109求取泵台数增减前后的泵效率(步骤S17)。Next, the pump efficiency acquisition unit 109 obtains the pump efficiency before and after the increase or decrease in the number of pumps (step S17 ).

接下来，泵台数控制部105进行“增加台数条件1”、“增加台数条件2”和“增加台数条件5”的判定(步骤S18)。然后，泵台数控制部105在全部满足全部三个条件时(步骤S18＝是)，将2次泵20的运转台数增加1台(步骤S5)。Next, the number-of-pumps control part 105 performs determination of "number increase condition 1", "number increase condition 2", and "number increase condition 5" (step S18). Then, when all three conditions are satisfied (step S18=YES), the pump number control part 105 increases the number of operation of the secondary pump 20 by 1 (step S5).

在比较的结果是“增加台数条件1”、“增加台数条件2”和“增加台数条件5”当中任一条件不满足的情况下(步骤S18＝否)，前进至步骤S18的处理。As a result of the comparison, if any of the "increase number condition 1", "increase number condition 2" and "increase number condition 5" is not satisfied (step S18=NO), proceed to step S18.

接下来，泵台数控制部105进行“减少台数条件1”、“减少台数条件2”和“减少台数条件5”的判定(步骤S18)。然后，泵台数控制部105在满足全部三个条件时(步骤S18＝是)，将2次泵20的运转台数减少1台(步骤S7)。Next, the number-of-pumps control part 105 performs determination of "number reduction condition 1", "number reduction condition 2", and "number reduction condition 5" (step S18). Then, when all three conditions are satisfied (step S18=YES), the pump number control part 105 reduces the number of operation of the secondary pump 20 by 1 (step S7).

在比较的结果是“减少台数条件1”、“减少台数条件2”和“减少台数条件5”当中任一条件不满足的情况下(步骤S18＝否)，前进至步骤S8的处理。步骤S8的处理与图3相同。也就是，反复从步骤S1起的处理直到热源系统停止为止，。As a result of the comparison, if any of the "number reduction condition 1", "number reduction condition 2" and "number reduction condition 5" is not satisfied (step S18=NO), the process proceeds to step S8. The processing in step S8 is the same as that in FIG. 3 . That is, the processing from step S1 is repeated until the heat source system is stopped.

本实施方式不仅能够与第一实施方式及其变形例组合，也能够与第二以及第三实施方式组合。在与第二或第三实施方式组合的情况下，能够决定泵运转台数使得防止反复增减2次泵20的台数，探寻泵效率高的运转点的同时满足向负载的流量测量值，因此能够期待节能效果。This embodiment can be combined not only with the first embodiment and its modifications, but also with the second and third embodiments. In the case of combining with the second or third embodiment, it is possible to determine the number of pumps to be operated so as to prevent repeated increase and decrease of the number of pumps 20, and to search for an operating point with high pump efficiency while satisfying the flow rate measurement value to the load. Looking forward to the energy saving effect.

上述泵台数控制装置在内部具有计算机。而且，上述泵台数控制装置的各处理的过程是以程序的形式存储在计算机可读的记录介质中，通过由计算机读出并执行该程序，从而进行上述处理。在此，计算机可读的记录介质是指磁盘、光磁盘、CD-ROM、DVD-ROM、半导体存储器等。另外，可以将该计算机程序通过通信线路配送给计算机，并由接收到该配信的计算机执行该程序。The above-mentioned pump number control device has a computer inside. Furthermore, the procedure of each process of the above-mentioned pump number control device is stored in a computer-readable recording medium in the form of a program, and the above-mentioned process is performed by reading and executing the program by a computer. Here, the computer-readable recording medium refers to a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, and the like. In addition, the computer program may be distributed to computers via a communication line, and the computer that receives the distribution may execute the program.

另外，上述程序可以用于实现前述功能的一部分。In addition, the above-mentioned program can be used to realize a part of the aforementioned functions.

此外，也可以是能够通过与已经记录在计算机系统中的程序的组合来实现前述功能的程序，即所谓的差分文件(差分程序)。In addition, a program capable of realizing the aforementioned functions by combining with a program already recorded in the computer system may be a so-called differential file (difference program).

此外，在不脱离本发明的主旨的范围内，能够适当地将上述实施方式中的构成要素替换为众所周知的构成要素。另外，本发明的技术范围并不限于上述实施方式，在不脱离本发明的主旨的范围内能够实施各种变更。In addition, the constituent elements in the above-described embodiments can be appropriately replaced with well-known constituent elements within a range not departing from the gist of the present invention. In addition, the technical scope of this invention is not limited to the said embodiment, Various changes can be implemented in the range which does not deviate from the summary of this invention.

工业实用性Industrial Applicability

根据上述泵台数控制方法、泵台数控制装置、泵系统、热源系统以及程序，能够在不知道压损特性等设备特性的前提下在适当的定时适当地控制泵的运转台数。According to the method for controlling the number of pumps, the device for controlling the number of pumps, the pump system, the heat source system, and the program, the number of operating pumps can be appropriately controlled at an appropriate timing without knowing the characteristics of equipment such as pressure loss characteristics.

符号说明Symbol Description

10 1次泵10 1 pump

20 2次泵20 2 pumps

21 流量计21 flow meter

22 温度计22 thermometer

23 温度计23 thermometer

30 热源机30 heat source machine

40 负载40 load

50 泵台数控制装置50 pump number control device

101 台数判断流量值获取部101 Unit number judgment flow value acquisition unit

102 台数判断频率值获取部102 Unit number judgment frequency value acquisition unit

103 泵频率设定部103 Pump frequency setting part

104 流量获取部104 Traffic Acquisition Department

105 泵台数控制部105 Pump Number Control Department

107 泵压头获取部107 Pump head acquisition unit

108 泵频率估算值获取部108 Pump Frequency Estimated Value Acquisition Unit

109 泵效率获取部109 Pump Efficiency Acquisition Department

110 温度获取部110 temperature acquisition part

111 台数判断热负荷获取部111 Unit number judgment heat load acquisition unit

200 存储部200 storage department

Claims (11)

1. a pump unit number control method, has:

Based on by the multiple pumps being connected in parallel to the flow of thermal medium of load force feed or described load instituteThe frequency instruction value of each pump instruction in the thermic load needed and the operating in the middle of the plurality of pump,Increase and decrease the operation of the operating number of described pump.

Pump unit number control method the most according to claim 1, wherein,

Have: obtain according to the measured value of the ejection flow of the pump in the operating in the middle of the plurality of pumpRepresent that the number of units to the flow of the thermal medium of described load force feed judges the operation of flow value,

Increase and decrease the operation of the operating number of described pump, judge that flow value is prespecified in described number of unitsMore than threshold value G α and the frequency instruction value indicated to each pump are prespecified more than threshold value F αIn the case of, increase the operating number of described pump, and judge that flow value is as advising in advance in described number of unitsFixed below threshold value G β and the frequency instruction value indicated to each pump are prespecified threshold value F βIn the case of below, reduce the operating number of described pump.

Pump unit number control method the most according to claim 1, wherein,

There is the operation calculating the thermic load required by described load,

Increase and decrease the operation of the operating number of described pump, be prespecified threshold value L α in described thermic loadIn the case of the frequency instruction value indicated above and to each pump is prespecified more than threshold value F α,Increase the operating number of described pump, and described thermic load be prespecified below threshold value L β,And in the case of the frequency instruction value indicated to each pump is prespecified below threshold value F β, reduceThe operating number of described pump.

4. according to the pump unit number control method described in Claims 2 or 3, wherein,

Increase and decrease the operation of the operating number of described pump, also that the pump head of described pump is described with as increasingThe increase number of units license pump head of the threshold value of the number of units of pump or the threshold value as the number of units reducing described pumpMinimizing number of units license pump head compare, only at described increase number of units license pump head less than describedIn the case of pump head, increase the operating number of pump, be only more than at described minimizing number of units license pump headIn the case of described pump head, reduce the operating number of pump.

Pump unit number control method the most according to claim 4, wherein,

There is following operation: according to the ejection flow of the pump after increasing based on described pump operating number andThe pump head that pump head calculates relative to the prespecified dependency relation of the ejection flow of pump, meterCalculating makes the frequency of described pump carry out pump head during action with prespecified threshold value F β, asks for instituteState increase number of units license pump head, and according to the ejection of the pump after reducing based on described pump operating numberFlow and described prespecified dependency relation and the pump head that calculates, calculate the frequency making described pumpRate carries out pump head during action with prespecified threshold value F α, asks for the license of described minimizing number of unitsPump head.

6. according to the pump unit number control method described in Claims 2 or 3, wherein,

There is following operation: with the pump head after the increase and decrease of the operating number of pump and current pump head phaseDeng for condition, the ejection flow of the pump head under given frequency based on the pump in described operating and pumpPrespecified dependency relation, obtain pump operating number increase after frequency instruction value and fortuneFrequency instruction value after the minimizing of turntable number,

Increase and decrease the operation of the operating number of described pump, and then only frequency after described operating number increasesCommand value is more than the operating number of increase pump during described threshold value F β, and only subtracts at described operating numberFrequency instruction value after Shao is less than the operating number reducing pump during described threshold value F α.

7. according to the pump unit number control method according to any one of claim 2 to 6, wherein,

There is following operation: the ejection flow under given frequency based on the pump in described operating and pumpThe prespecified dependency relation of efficiency, obtains the efficiency of pump after the operating number increase of pump and operatingThe efficiency of pump after number of units minimizing and the current efficiency of pump,

Increase and decrease the operation of the operating number of described pump, and then only pump efficiency after described operating number increasesRate is to increase the operating number of pump in the case of more than the described current efficiency of pump, and only in described fortuneThe efficiency of pump after turntable number reduces is to reduce the operating of pump in the case of more than the described current efficiency of pumpNumber of units.

8. a pump number control device, possesses pump unit number control portion, this pump unit number control portion make toThe operating number of the multiple pumps being connected in parallel of load force feed thermal medium, based on to described load force feedIn thermic load needed for the flow of thermal medium or described load and the operating in the middle of the plurality of pumpEach pump instruction frequency instruction value increase and decrease.

9. a pumping system, possesses:

The multiple pumps being connected in parallel；And

Pump number control device described in claim 8,

Change the operating number of described pump and make the pump head of every described pump and flow measurements notChange.

10. a heat source system, possesses:

Load；

The multiple heat source machines being connected in parallel, its force feed thermal medium；

No. 2 pumps, its by from the further force feed of thermal medium of the multiple heat source machine force feeds being connected in parallel to negativeCarry；And

Pump number control device described in claim 8.

11. 1 kinds of programs, for making the computer of pump number control device play merit as such as lower unitCan: based on by the multiple pumps being connected in parallel needed for the flow of thermal medium or described load of load force feedThermic load and operating in the middle of the plurality of pump in the frequency instruction value of each pump instruction, comeIncrease and decrease the unit of the operating number of described pump.