CN107477926B - Air conditioning system, and control device and method of air conditioning system - Google Patents

Abstract

The invention discloses an air conditioning system, a control device and a control method of the air conditioning system, wherein a first port of an outdoor heat exchanger is connected with a compressor through a first pipeline, a first port of an indoor heat exchanger is connected with the compressor through a third pipeline, and N branches connected in parallel are connected with the first pipeline in parallel or in series; the N valve components are correspondingly arranged on the N branches, and each valve component is used for controlling the opening or closing of the corresponding branch; the first temperature detection unit is used for detecting the temperature of a refrigerant of the indoor heat exchanger; the second temperature detection unit is used for detecting the suction temperature of the compressor; the control unit is used for acquiring the temperature difference between the suction temperature of the compressor and the temperature of a refrigerant of the indoor heat exchanger and controlling the opening or closing of the N valve assemblies according to the temperature difference. Therefore, the flow of the refrigerant of the air conditioning system can be controlled by controlling the opening or closing of the valve component, so that the refrigerant entering the indoor heat exchanger is ensured not to be overheated, and the refrigerating performance of the air conditioner is improved.

Description

Air conditioning system, and control device and method of air conditioning system

Technical Field

The present invention relates to the field of air conditioning technologies, and in particular, to a control device for an air conditioning system, a control method for an air conditioning system, and a non-transitory computer-readable storage medium.

Background

In the related technology, the evaporator and the condenser of the frequency conversion energy-efficient air conditioning system are both larger in volume, and the refrigerant filling amount of the system is 30% higher than that of a common air conditioning system. However, the related art has problems that the high Energy Efficiency system generally adopts a compressor with a small displacement, the refrigerant amount exceeds the maximum charge amount of the compressor, and there is a great safety hazard to the liquid return, oil return and reliability of the compressor, and when the compressor operates in a low frequency state, the flow rate of the system is small, the refrigerant is basically accumulated in the condenser, so that the refrigerant in the evaporator is relatively little, the return air temperature of the compressor fluctuates and the temperature is relatively high, the refrigeration amount of the system decreases, and the EER (Energy Efficiency Ratio, the refrigeration performance coefficient of the air conditioner) significantly decreases.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first object of the present invention is to provide a control device for an air conditioning system, which can ensure that the refrigerant entering the evaporator does not overheat, and the return air temperature of the compressor does not fluctuate or become higher.

A second object of the present invention is to provide an air conditioning system.

A third object of the present invention is to provide a control method of an air conditioning system.

A fourth object of the invention is to propose a non-transitory computer-readable storage medium.

In order to achieve the above object, a first aspect of the present invention provides a control device for an air conditioning system, the air conditioning system including a compressor, an outdoor heat exchanger and an indoor heat exchanger, a first port of the outdoor heat exchanger being connected to the compressor through a first pipeline, and a first port of the indoor heat exchanger being connected to the compressor through a third pipeline, the control device including: the N branches are connected in parallel or connected in series with the first pipeline, wherein N is an integer greater than 1; the N valve components are correspondingly arranged on the N branches, and each valve component is used for controlling the opening or closing of the corresponding branch; the first temperature detection unit is used for detecting the temperature of a refrigerant of the indoor heat exchanger; a second temperature detection unit for detecting a suction temperature of the compressor; and the control unit is connected with the N valve assemblies, the first temperature detection unit and the second temperature detection unit respectively, and is used for acquiring the temperature difference between the suction temperature of the compressor and the temperature of a refrigerant of the indoor heat exchanger and controlling the opening or closing of the N valve assemblies according to the temperature difference.

According to the control device of the air conditioning system provided by the embodiment of the invention, N branches are connected in parallel or in series on a first pipeline connected with a compressor at a first port of an outdoor heat exchanger, N valve components are correspondingly arranged on the N branches, each valve component is used for controlling the opening or closing of the corresponding branch, a control unit obtains the temperature difference between the suction temperature of the compressor and the refrigerant temperature of the indoor heat exchanger and controls the opening or closing of the N valve components according to the temperature difference, therefore, the device of the embodiment of the invention can control the refrigerant flow of the air conditioning system by controlling the opening or closing of the valve components, further ensures that the refrigerant entering the indoor heat exchanger cannot be overheated, and ensures that the return air temperature of the compressor cannot fluctuate and has high temperature, thereby improving the refrigeration performance of the air conditioner and improving the reliability of the compressor, the user experience is improved.

According to an embodiment of the present invention, a plurality of temperature intervals are configured, and the plurality of temperature intervals respectively correspond to a plurality of opening numbers, wherein the control unit is further configured to obtain the temperature interval to which the temperature difference belongs, and control the N valve assemblies according to the opening number corresponding to the temperature interval to which the temperature difference belongs.

According to an embodiment of the present invention, when the air conditioning system performs cooling, the control unit is further configured to: when the temperature difference is larger than a first temperature, controlling any one of the N valve components to be opened; when the temperature difference is greater than or equal to the second temperature and less than or equal to the first temperature, controlling any M valve assemblies to be opened, wherein M is an integer greater than 1 and less than N; and when the temperature difference is smaller than the second temperature, controlling the N valve components to be opened.

According to an embodiment of the present invention, the N branches are disposed at a first port of the outdoor heat exchanger, and the first temperature detecting unit is disposed at the first port of the indoor heat exchanger, so as to obtain a refrigerant temperature of the indoor heat exchanger by detecting the refrigerant temperature at the first port of the indoor heat exchanger.

According to an embodiment of the present invention, the control unit is further configured to obtain an operating frequency of the air conditioning system, and control the N valve assemblies according to the temperature difference when the operating frequency of the air conditioning system is less than a preset frequency.

In order to achieve the above object, a second aspect of the present invention provides an air conditioning system, including the control device of the air conditioning system.

According to the air conditioning system provided by the embodiment of the invention, the control device of the air conditioning system ensures that the refrigerant entering the indoor heat exchanger cannot be overheated and ensures that the return air temperature of the compressor cannot fluctuate and be higher, so that the refrigeration performance of the air conditioner is improved, the reliability of the compressor is improved, and the user experience is improved

In order to achieve the above object, a third embodiment of the present invention provides a method for controlling an air conditioning system, where the air conditioning system includes a compressor, an outdoor heat exchanger, an indoor heat exchanger, N branches, and N valve assemblies, a first port of the outdoor heat exchanger is connected to the compressor through a first pipeline, a first port of the indoor heat exchanger is connected to the compressor through a third pipeline, the N branches are connected in parallel, the N branches connected in parallel are connected in parallel or in series with the first pipeline, the N valve assemblies are correspondingly disposed on the N branches, each valve assembly is configured to control opening or closing of a corresponding branch, N is an integer greater than 1, and the method includes the following steps: detecting the temperature of a refrigerant of the indoor heat exchanger; detecting a suction temperature of the compressor; and acquiring the temperature difference between the suction temperature of the compressor and the temperature of a refrigerant of the indoor heat exchanger, and controlling the opening or closing of the N valve assemblies according to the temperature difference.

According to the control method of the air conditioning system provided by the embodiment of the invention, the temperature difference between the suction temperature of the compressor and the refrigerant temperature of the indoor heat exchanger is obtained by detecting the refrigerant temperature of the indoor heat exchanger and the suction temperature of the compressor, and the opening or closing of the N valve assemblies is controlled according to the temperature difference. Therefore, the method provided by the embodiment of the invention can control the flow of the refrigerant of the air conditioning system by controlling the opening or closing of the valve component, so that the refrigerant entering the indoor heat exchanger is prevented from overheating, and the return air temperature of the compressor is prevented from fluctuating and having a high temperature, thereby improving the refrigeration performance of the air conditioner, improving the reliability of the compressor and improving the user experience.

According to an embodiment of the present invention, constructing a plurality of temperature intervals corresponding to a plurality of opening numbers, respectively, and controlling opening or closing of the N valve assemblies according to the temperature difference comprises: acquiring a temperature interval to which the temperature difference belongs; and controlling the N valve assemblies according to the opening number corresponding to the temperature interval to which the temperature difference belongs.

According to an embodiment of the present invention, when the air conditioning system performs cooling, the controlling the opening or closing of the N valve assemblies according to the temperature difference includes: when the temperature difference is larger than a first temperature, controlling any one of the N valve components to be opened; when the temperature difference is greater than or equal to the second temperature and less than or equal to the first temperature, controlling any M valve assemblies to be opened, wherein M is an integer greater than 1 and less than N; and when the temperature difference is smaller than the second temperature, controlling the N valve components to be opened.

According to an embodiment of the present invention, the refrigerant temperature of the indoor heat exchanger is obtained by detecting the refrigerant temperature of the first port of the indoor heat exchanger.

According to an embodiment of the present invention, the control method of the air conditioning system further includes: acquiring the operating frequency of the air conditioning system; and when the running frequency of the air conditioning system is less than a preset frequency, controlling the N valve assemblies according to the temperature difference.

To achieve the above object, a fourth aspect of the present invention provides a non-transitory computer-readable storage medium having a computer program stored thereon, the computer program implementing the control method of the air conditioning system when executed by a processor.

According to the non-transitory computer readable medium provided by the embodiment of the invention, by executing the control method of the air conditioning system, the refrigerant entering the indoor heat exchanger is ensured not to be overheated, and the return air temperature of the compressor is ensured not to be fluctuated and the temperature is higher, so that the refrigeration performance of the air conditioner is improved, the reliability of the compressor is improved, and the user experience is improved.

Drawings

Fig. 1 is a block schematic diagram of a control device of an air conditioning system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an air conditioning system according to one embodiment of the present invention;

FIG. 3 is a block schematic diagram of an air conditioning system according to an embodiment of the present invention;

fig. 4 is a flowchart of a control method of an air conditioning system according to an embodiment of the present invention;

fig. 5 is a flowchart of a control method of an air conditioning system according to an embodiment of the present invention; and

fig. 6 is a flowchart of a control method of an air conditioning system according to another embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A control device of an air conditioning system, and a control method of an air conditioning system according to embodiments of the present invention are described below with reference to the accompanying drawings.

Fig. 1 is a block schematic diagram of a control apparatus of an air conditioning system according to an embodiment of the present invention. Wherein, according to the embodiment of fig. 2, the air conditioning system may include a compressor 1, anoutdoor heat exchanger 2, and an indoor heat exchanger 3, a first port of theoutdoor heat exchanger 2 is connected to the compressor 1 through afirst pipe 6, and a first port of the indoor heat exchanger 3 is connected to the compressor 1 through athird pipe 8. Further, as shown in fig. 2, the second port of theoutdoor heat exchanger 2 is connected to the second port of the indoor heat exchanger 3 through asecond pipe 7, and the first port of the indoor heat exchanger 3 is connected to the compressor 1 through athird pipe 8.

Specifically, as shown in fig. 2, the air conditioning system may further include a throttling device 4 and a four-way valve 5, wherein a first end C of the four-way valve 5 is connected to a first port of theoutdoor heat exchanger 2, a second end S of the four-way valve 5 is connected to a gas outlet of the compressor 1, that is, the first port of theoutdoor heat exchanger 2 may be connected to the gas outlet of the compressor 1 through the four-way valve 5, a third end E of the four-way valve 5 is connected to a first port of the indoor heat exchanger 3, a fourth end D of the four-way valve 5 is connected to a return port of the compressor 1, that is, the first port of the indoor heat exchanger 3 may be connected to a return port of the compressor 1 through the four-way valve, the second port of theoutdoor heat exchanger 2 is connected to the indoor heat.

As shown in fig. 1 and 2, a control device of an air conditioning system according to an embodiment of the present invention includes:n branches 10,N valve assemblies 11, a firsttemperature detecting unit 30, a second temperature detecting unit 40 and a control unit 20 connected in parallel.

The N branches connected in parallel are connected with thefirst pipeline 6 in parallel or in series, wherein N is an integer greater than 1; for example, as shown in fig. 2,N branches 10 connected in parallel are connected in parallel with thefirst pipeline 6;n valve components 11 are correspondingly arranged on theN branches 10, each valve component can be connected in series with the corresponding branch, and each valve component is used for controlling the opening or closing of the corresponding branch; the firsttemperature detection unit 30 is configured to detect a temperature of a refrigerant of the indoor heat exchanger 3; the second temperature detection unit 40 is used for detecting the suction temperature of the compressor 1; the control unit 20 is connected to theN valve assemblies 11, the firsttemperature detection unit 30, and the second temperature detection unit 40, respectively, and the control unit 20 is configured to obtain a temperature difference between a suction temperature of the compressor 1 and a temperature of a refrigerant of the indoor heat exchanger 3, and control theN valve assemblies 11 to be opened or closed according to the temperature difference.

It should be noted that theN branches 10 may be connected in parallel between the first end C of the four-way valve 5 and the first port of theoutdoor heat exchanger 2, the firsttemperature detecting unit 30 may be disposed between the first port of the indoor heat exchanger 3 and the four-way valve 5, and the second temperature detecting unit 40 may be disposed at the air suction port of the compressor 1, specifically, as shown in fig. 2, theN branches 10 connected in parallel are disposed at the first port of theoutdoor heat exchanger 2, the firsttemperature detecting unit 30 is disposed at the first port of the indoor heat exchanger 3 to obtain the refrigerant temperature of the indoor heat exchanger by detecting the refrigerant temperature at the first port of the indoor heat exchanger 3, and then the control unit 20 controls the opening or closing of the N valve assemblies according to the temperature difference between the suction temperature of the compressor and the refrigerant temperature of the indoor heat exchanger.

Specifically, in the air conditioning system, a first port of theoutdoor heat exchanger 2 is connected to the compressor 1 through a first pipeline, the first pipeline is connected in parallel or in series with theN branches 10, each branch is provided with a valve assembly for controlling the opening or closing of the branch, the firsttemperature detection unit 30 can detect the temperature of the refrigerant of the indoor heat exchanger in real time, the second temperature detection unit 40 can detect the suction temperature of the compressor in real time, the firsttemperature detection unit 30 and the second temperature detection unit 40 send the detected temperature to the control unit 20, and the control unit 20 obtains the temperature difference between the suction temperature of the compressor and the temperature of the refrigerant of the indoor heat exchanger and controls the opening or closing of the N valve assemblies according to the temperature difference.

From this, can control air conditioning system's refrigerant flow through opening or closing of control valve subassembly, and then guarantee that the overheated phenomenon can not appear in the refrigerant that gets into indoor heat exchanger to guarantee that the return air temperature of compressor can not appear undulant and the phenomenon that the temperature is higher than usual, thereby improve the refrigerating output of air conditioner, improve the reliability of compressor, promote user's experience.

According to an embodiment of the present invention, a plurality of temperature intervals are configured, and the plurality of temperature intervals correspond to the plurality of opening numbers, respectively, wherein the control unit 20 is further configured to obtain the temperature interval to which the temperature difference belongs, and control the N valve assemblies 11 according to the opening number corresponding to the temperature interval to which the temperature difference belongs.

It should be noted that a plurality of temperature intervals with temperature difference may be configured according to the temperature difference between the suction temperature of the compressor 1 and the refrigerant temperature of the indoor heat exchanger 3, and the plurality of temperature intervals may correspond to the number of opened valve assemblies, that is, each index interval may correspond to one opened number, where each opened number may be an integer greater than 0 and less than or equal to N.

Specifically, a plurality of temperature intervals may be configured by presetting a plurality of temperature thresholds, for example, at least one temperature threshold may be set, a first temperature interval when the temperature is less than the temperature threshold, and a second temperature interval when the temperature is equal to or greater than the temperature threshold; for another example, two temperature thresholds may be set, which are a first temperature interval when the temperature is greater than the first temperature threshold, a second temperature interval when the temperature is greater than or equal to the second temperature and less than or equal to the first temperature, and a third temperature interval when the temperature is less than the second temperature; for another example, three temperature thresholds may be set, which are a first temperature interval when the temperature is greater than the first temperature threshold, a second temperature interval when the temperature is greater than or equal to the second temperature and less than or equal to the first temperature, a third temperature interval when the temperature is greater than or equal to the third temperature and less than the second temperature, and a fourth temperature interval when the temperature is less than the third temperature. Each temperature interval has the opening number of the corresponding valve components, so that the refrigerant flow of the air conditioning system is adjusted by controlling the opening of the valve components with the corresponding opening number.

Specifically, the control unit 20 may obtain the refrigerant temperature of the indoor heat exchanger 3 through the firsttemperature detecting unit 30 and obtain the suction temperature of the compressor 1 through the second temperature detecting unit 40, further obtain the temperature difference between the refrigerant temperature of the indoor heat exchanger and the suction temperature of the compressor, and control theN valve assemblies 11 according to the opening number corresponding to the temperature difference, that is, control the valve assemblies corresponding to the opening number in theN valve assemblies 11 to open.

According to an embodiment of the present invention, when the air conditioning system performs cooling, the control unit 20 is further configured to: when the temperature difference is larger than the first temperature, controlling any one of theN valve components 11 to be opened; when the temperature difference is greater than or equal to a second temperature and less than or equal to a first temperature, controlling any M of the N valve assemblies to be opened, wherein M is an integer greater than 1 and less than N; when the temperature difference is less than the second temperature, theN valve components 11 are all controlled to be opened.

That is, the air conditioning system may be preset with two temperature thresholds, i.e., a first temperature and a second temperature, to construct three temperature intervals, wherein the first temperature interval corresponds to one valve assembly being opened, the second temperature interval corresponds to M valve assemblies being opened, and the third temperature interval corresponds to N valve assemblies being opened.

Specifically, when the air conditioning system performs refrigeration, the control unit 20 obtains a temperature difference between a suction temperature of the compressor 1 and a refrigerant temperature of the indoor heat exchanger 3, and determines a temperature interval to which the temperature difference belongs, that is, determines a relationship between an internal temperature difference and a preset temperature threshold, and if the temperature difference is greater than a first temperature, the control unit 20 controls any one of theN valve assemblies 11 to be opened; if the temperature difference is greater than or equal to the second temperature and less than or equal to the first temperature, the control unit 20 controls any M of theN valve assemblies 11 to be opened; if the temperature difference is less than the second temperature, the control unit 20 controls theN valve components 11 to be opened. Wherein the second temperature is less than the first temperature.

It can be understood that when the temperature difference between the suction temperature of the compressor 1 and the refrigerant temperature of the indoor heat exchanger 3 is small, that is, the indoor heat exchanger 3 needs more refrigerants to refrigerate, at this time,more valve assemblies 11 are opened, and the flow rate of the refrigerants flowing from theoutdoor heat exchanger 2 to the indoor heat exchanger 3 is increased; the refrigerant in the indoor heat exchanger 3 is sufficient, and the temperature of the refrigerant flowing from the indoor heat exchanger 3 to the compressor 1 is ensured not to be higher, namely the return air temperature of the compressor is ensured not to be increased. Accordingly, the control unit 20 controls the opening or closing of theN valve assemblies 11 according to the temperature difference between the suction temperature of the compressor 1 and the refrigerant temperature of the indoor heat exchanger 3, so as to change the refrigerant flow rate of the air conditioning system.

Wherein, according to an embodiment of the present invention, when N is an even number, M is N/2; when N is an odd number, M is (N + 1)/2. For example, N may be set to 6, M may be set to 3, i.e., 3valve components 11 may be opened when the temperature difference is equal to or greater than the second temperature and equal to or less than the first temperature, and the other N-3 valve components (i.e., 3 valve components 11) are closed.

For example, the first temperature may be set to 5 ℃ and the second temperature may be set to 2 ℃, for example, when the air conditioning system performs cooling, the control unit 20 acquires the temperature of the compressor 1Suction temperature T_{Suction device}Refrigerant temperature T with indoor heat exchanger 3_{Evaporate to obtain}Temperature difference T between_{Suction device}-T_{Evaporate to obtain}At a temperature difference T_{Suction device}-T_{Evaporate to obtain}Greater than the first temperature (i.e. T)_{Suction device}-T_{Evaporate to obtain}When the temperature is higher than 5 ℃, the control unit 20 controls any one of the 6valve components 11 to be opened and controls the other 5valve components 11 to be closed; at a temperature difference_{Suction device}-T_{Evaporate to obtain}Greater than the second temperature and less than the first temperature (i.e. T is more than or equal to 2 ℃)_{Suction device}-T_{Evaporate to obtain}When the temperature is less than or equal to 5 ℃), the control unit 20 controls any 3 of the 6valve components 11 to be opened and controls the other 3valve components 11 to be closed; at a temperature difference T_{Suction device}-T_{Evaporate to obtain}Less than the second temperature by 2 deg.C (i.e. T)_{Suction device}-T_{Evaporate to obtain}At the temperature of less than 2 ℃, the control unit 20controls 6valve components 11 to be opened.

Further, according to an embodiment of the present invention, the control unit 20 is further configured to obtain an operating frequency of the air conditioning system, and control theN valve assemblies 11 according to a temperature difference between a suction temperature of the compressor 1 and a refrigerant temperature of the indoor heat exchanger 3 when the operating frequency of the air conditioning system is less than a preset frequency.

That is, if the compressor 1 is operated at a low frequency while the air conditioning system performs cooling, theN valve assemblies 11 are controlled according to a temperature difference between a suction temperature of the compressor 1 and a refrigerant temperature of the indoor heat exchanger 3. When the compressor 1 operates in low-frequency refrigeration, the flow rate of the refrigerant of the air conditioning system is low, the refrigerant quantity is easy to accumulate in theoutdoor heat exchanger 2,more valve components 11 are opened, and the refrigerant quantity entering the indoor heat exchanger 3 is ensured to be sufficient

In addition, according to an embodiment of the present invention, the control unit 20 is further configured to control all of theN valve assemblies 11 to be opened when the operating frequency of the air conditioning system is greater than or equal to the preset frequency.

That is, when the air conditioning system performs cooling, if the compressor 1 operates at high frequency, the entire pipeline of theoutdoor heat exchanger 2 is fully involved in operation, that is, all of theN valve assemblies 11 are opened, so as to satisfy the refrigerant circulation during high-frequency cooling of the air conditioning system.

In summary, according to the control device of the air conditioning system provided in the embodiments of the present invention, N branches are connected in parallel or in series on a first pipeline connecting a first port of an outdoor heat exchanger and a compressor, N valve assemblies are correspondingly disposed on the N branches, each valve assembly is used for controlling the opening or closing of the corresponding branch, a control unit obtains a temperature difference between an intake temperature of the compressor and a refrigerant temperature of the indoor heat exchanger, and controls the opening or closing of the N valve assemblies according to the temperature difference, so that the device of the embodiments of the present invention can control a refrigerant flow of the air conditioning system by controlling the opening or closing of the valve assemblies, thereby ensuring that a refrigerant entering the indoor heat exchanger does not overheat, ensuring that a return air temperature of the compressor does not fluctuate and is high in temperature, improving a refrigeration performance of the air conditioner, and improving reliability of the compressor, the user experience is improved.

The embodiment of the invention also provides an air conditioning system.

Fig. 3 is a block schematic diagram of an air conditioning system according to an embodiment of the present invention. As shown in fig. 2, the air conditioning system 200 includes the control device 100 of the air conditioning system described above.

According to the air conditioning system provided by the embodiment of the invention, the control device of the air conditioning system ensures that the refrigerant entering the indoor heat exchanger cannot be overheated and the return air temperature of the compressor cannot be fluctuated and has a higher temperature, so that the refrigeration performance of the air conditioner is improved, the reliability of the compressor is improved and the user experience is improved.

Fig. 4 is a flowchart of a control method of an air conditioning system according to an embodiment of the present invention. Wherein, according to the embodiment of fig. 2, air conditioning system includes the compressor, outdoor heat exchanger, indoor heat exchanger, a plurality of N branches and a plurality of N valve components, the first port of outdoor heat exchanger links to each other with the compressor through first pipeline, the first port of indoor heat exchanger links to each other with the compressor through the third pipeline, a plurality of branch parallel connection of N, a plurality of branch of parallel connection and first pipeline are parallelly connected or series connection, a plurality of N valve components correspond and set up in a plurality of N branches, every valve component is used for controlling opening or closing of corresponding branch, N is for being greater than 1 integer N. Further, as shown in fig. 2, the second port of the outdoor heat exchanger is connected to the second port of the indoor heat exchanger through a second pipeline, and the first port of the indoor heat exchanger is connected to the compressor through a third pipeline.

Specifically, as shown in fig. 2, the air conditioning system may further include a throttling device and a four-way valve, wherein a first end of the four-way valve is connected to a first port of the outdoor heat exchanger, a second end of the four-way valve is connected to a gas outlet of the compressor, that is, the first port of the outdoor heat exchanger may be connected to the gas outlet of the compressor through the four-way valve, a third end of the four-way valve is connected to a first port of the indoor heat exchanger, a fourth end of the four-way valve is connected to a return port of the compressor, that is, the first port of the indoor heat exchanger may be connected to a return port of the compressor through the four-way valve, the second port of the outdoor heat exchanger.

As shown in fig. 4, the control method of the air conditioning system according to the embodiment of the present invention includes the steps of:

s1: and detecting the temperature of the refrigerant of the indoor heat exchanger.

It should be noted that, according to an embodiment of the present invention, the refrigerant temperature of the indoor heat exchanger is obtained by detecting the refrigerant temperature of the first port of the indoor heat exchanger. The refrigerant temperature of the indoor heat exchanger can be detected through the first temperature detection unit, the first temperature detection unit can be arranged at the first port of the indoor heat exchanger, specifically, as shown in fig. 2, the N branch circuits can be arranged at the first port of the outdoor heat exchanger, and the first temperature detection unit can be arranged at the first port of the indoor heat exchanger.

S2: the suction temperature of the compressor is detected.

The second temperature detecting unit may be disposed at the suction port of the compressor to detect the suction temperature of the compressor.

S3: and acquiring the temperature difference between the suction temperature of the compressor and the temperature of a refrigerant of the indoor heat exchanger, and controlling the opening or closing of the N valve assemblies according to the temperature difference.

Specifically, when the air conditioner operates in a refrigerating mode, the temperature difference between the air suction temperature of the compressor and the refrigerant temperature of the indoor heat exchanger is obtained by detecting the refrigerant temperature of the indoor heat exchanger and the air suction temperature of the compressor, and the N valve assemblies are controlled to be opened or closed according to the temperature difference.

From this, can control air conditioning system's refrigerant flow through opening or closing of control valve subassembly, and then guarantee that the overheated phenomenon can not appear in the refrigerant that gets into the evaporimeter to guarantee that the return air temperature of compressor can not appear undulant and the phenomenon that the temperature is higher than usual, thereby improve the refrigerating output of air conditioner, improve the reliability of compressor, promote user's experience.

According to an embodiment of the present invention, as shown in fig. 5, a plurality of temperature intervals are configured, the plurality of temperature intervals respectively correspond to a plurality of opening numbers, and the opening or closing of the N valve assemblies is controlled according to the temperature difference, including:

s101: and acquiring a temperature interval to which the temperature difference belongs.

S102: and controlling the N valve assemblies according to the opening number corresponding to the temperature interval to which the temperature difference belongs.

It should be noted that a plurality of temperature intervals with temperature differences may be configured according to the temperature difference between the suction temperature of the compressor and the refrigerant temperature of the indoor heat exchanger, and the plurality of temperature intervals may correspond to the opening number of the plurality of valve assemblies, that is, each temperature interval may correspond to one opening number, where each opening number may be an integer greater than 0 and less than or equal to N.

Specifically, a plurality of temperature intervals may be configured by presetting a plurality of temperature thresholds, for example, at least one temperature threshold may be set, a first temperature interval when the temperature is less than the temperature threshold, and a second temperature interval when the temperature is equal to or greater than the temperature threshold; for another example, two temperature thresholds may be set, which are a first temperature interval when the temperature is greater than the first temperature threshold, a second temperature interval when the temperature is greater than or equal to the second temperature and less than or equal to the first temperature, and a third temperature interval when the temperature is less than the second temperature; for another example, three temperature thresholds may be set, which are a first temperature interval when the temperature is greater than the first temperature threshold, a second temperature interval when the temperature is greater than or equal to the second temperature and less than or equal to the first temperature, a third temperature interval when the temperature is greater than or equal to the third temperature and less than the second temperature, and a fourth temperature interval when the temperature is less than the third temperature. Each temperature interval has the opening number of the corresponding valve components, so that the refrigerant flow of the air conditioning system is adjusted by controlling the opening of the valve components with the corresponding opening number.

Specifically, the refrigerant temperature of the indoor heat exchanger and the suction temperature of the compressor can be obtained by the first temperature detection unit and the second temperature detection unit, so that the temperature difference between the suction temperature of the compressor and the refrigerant temperature of the indoor heat exchanger is obtained, and the N valve assemblies are controlled according to the opening number corresponding to the temperature difference, namely the valve assemblies corresponding to the opening number in the N valve assemblies are controlled to be opened.

According to one embodiment of the present invention, controlling the opening or closing of the N valve assemblies according to a temperature difference when the air conditioning system performs cooling includes: when the temperature difference is larger than the first temperature, controlling any one of the N valve components to be opened; when the temperature difference is greater than or equal to the second temperature and less than or equal to the first temperature, controlling any M of the N valve assemblies to be opened, wherein M is an integer greater than 1 and less than N; and when the temperature difference is smaller than the second temperature, controlling the N valve components to be opened.

That is, the air conditioning system may be preset with two temperature thresholds, i.e., a first temperature and a second temperature, to construct three temperature intervals, wherein the first temperature interval corresponds to one valve assembly being opened, the second temperature interval corresponds to M valve assemblies being opened, and the third temperature interval corresponds to N valve assemblies being opened.

Specifically, when the air conditioning system performs refrigeration, the temperature difference between the suction temperature of the compressor and the refrigerant temperature of the indoor heat exchanger is obtained, and the temperature interval to which the temperature difference belongs is judged, namely the relation between the internal temperature difference and a preset temperature threshold is judged, and if the temperature difference is greater than a first temperature, any one of the N valve assemblies is controlled to be opened; if the temperature difference is greater than or equal to the second temperature and less than or equal to the first temperature, controlling any M of the N valve assemblies to be opened; and if the temperature difference is less than the second temperature, controlling the N valve components to be opened. Wherein the second temperature is less than the first temperature.

It can be understood that when the temperature difference between the suction temperature of the compressor and the refrigerant temperature of the indoor heat exchanger is small, that is, the indoor heat exchanger needs more refrigerants to refrigerate, at the moment, more valve assemblies are opened, and the flow rate of the refrigerants flowing from the outdoor heat exchanger to the indoor heat exchanger is increased; the refrigerant in the indoor heat exchanger is sufficient, the temperature of the refrigerant flowing from the indoor heat exchanger to the compressor is ensured not to be higher, namely the return air temperature of the compressor is ensured not to be increased. Therefore, the opening or closing of the N valve assemblies is controlled according to the temperature difference between the suction temperature of the compressor and the temperature of the refrigerant of the indoor heat exchanger, so that the flow rate of the refrigerant of the air conditioning system is changed.

Wherein, according to an embodiment of the present invention, when N is an even number, M is N/2; when N is an odd number, M is (N + 1)/2. For example, N may be set to 6, M may be set to 3, i.e., 3 valve components may be opened when the temperature difference is equal to or greater than the second temperature and equal to or less than the first temperature, and the other N-3 valve components (i.e., 3 valve components) are closed.

For example, the first temperature may be set to 5 ℃ and the second temperature may be set to 2 ℃, for example, when the air conditioning system performs cooling, the suction temperature T of the compressor is obtained_{Suction device}Refrigerant temperature T with indoor heat exchanger_{Evaporate to obtain}Temperature difference T between_{Suction device}-T_{Evaporate to obtain}At a temperature difference T_{Suction device}-T_{Evaporate to obtain}Greater than the first temperature (i.e. T)_{Suction device}-T_{Evaporate to obtain}When the temperature is higher than 5 ℃, any one of the 6 valve components is controlled to be opened, and the other 5 valve components are controlled to be closed; at a temperature difference_{Suction device}-T_{Evaporate to obtain}Greater than the second temperature and less than the first temperature (i.e. T is more than or equal to 2 ℃)_{Suction device}-T_{Evaporate to obtain}When the temperature is less than or equal to 5 ℃), controlling any 3 of the 6 valve components to be opened, and controlling the other 3 valve components to be closed; at a temperature difference T_{Suction device}-T_{Evaporate to obtain}Less than the second temperature by 2 deg.C (i.e. T)_{Suction device}-T_{Evaporate to obtain}When the temperature is lower than 2 ℃, controlling the opening of 6 valve components.

Further, according to an embodiment of the present invention, as shown in fig. 6, the control method of the air conditioning system further includes:

s201: and acquiring the operating frequency of the air conditioning system.

S202: and when the running frequency of the air conditioning system is less than the preset frequency, controlling the N valve assemblies according to the temperature difference.

That is, when the air conditioning system performs cooling, if the compressor is operated at a low frequency, the N valve assemblies are controlled according to a temperature difference between a suction temperature of the compressor and a refrigerant temperature of the indoor heat exchanger. When the compressor operates in low-frequency refrigeration, the flow rate of the refrigerant of the air conditioning system is low, the refrigerant quantity is easy to accumulate in the outdoor heat exchanger, more valve components are opened, and the refrigerant quantity entering the indoor heat exchanger is ensured to be sufficient

In addition, according to an embodiment of the present invention, when the operation frequency of the air conditioning system is greater than or equal to the preset frequency, the N valve assemblies are controlled to be fully opened.

That is to say, when the air conditioning system performs refrigeration, if the compressor runs at high frequency, the whole pipeline of the outdoor heat exchanger takes part in action, that is, the N valve components are all opened, so as to meet the requirement of refrigerant circulation during high-frequency refrigeration of the air conditioning system.

In summary, according to the control method of the air conditioning system provided by the embodiment of the invention, the temperature difference between the suction temperature of the compressor and the refrigerant temperature of the indoor heat exchanger is obtained by detecting the refrigerant temperature of the indoor heat exchanger and the suction temperature of the compressor, and the opening or closing of the N valve assemblies is controlled according to the temperature difference. Therefore, the method provided by the embodiment of the invention can control the flow of the refrigerant of the air conditioning system by controlling the opening or closing of the valve component, so that the refrigerant entering the indoor heat exchanger is prevented from overheating, and the return air temperature of the compressor is prevented from fluctuating and having a high temperature, thereby improving the refrigeration performance of the air conditioner, improving the reliability of the compressor and improving the user experience.

Embodiments of the present invention also provide a non-transitory computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the control method of the air conditioning system.

According to the non-transitory computer readable medium provided by the embodiment of the invention, by executing the control method of the air conditioning system, the refrigerant entering the indoor heat exchanger is ensured not to be overheated, and the return air temperature of the compressor is ensured not to be fluctuated and the temperature is higher, so that the refrigerating capacity of the air conditioner is improved, the reliability of the compressor is improved, and the user experience is improved.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (12)

1. The utility model provides an air conditioning system's controlling means, its characterized in that, air conditioning system includes compressor, outdoor heat exchanger and indoor heat exchanger, outdoor heat exchanger's first port through first pipeline with the compressor links to each other, indoor heat exchanger's first port through the third pipeline with the compressor links to each other, and outdoor heat exchanger's second port passes through the second pipeline and links to each other with indoor heat exchanger, is provided with throttling arrangement on the second pipeline, the device includes:

the N branches are connected in parallel or connected in series with the first pipeline, wherein N is an integer greater than 1;

the N valve components are correspondingly arranged on the N branches, and each valve component is used for controlling the opening or closing of the corresponding branch;

the first temperature detection unit is used for detecting the temperature of a refrigerant of the indoor heat exchanger;

a second temperature detection unit for detecting a suction temperature of the compressor;

and the control unit is connected with the N valve assemblies, the first temperature detection unit and the second temperature detection unit respectively, and is used for acquiring the temperature difference between the suction temperature of the compressor and the temperature of a refrigerant of the indoor heat exchanger and controlling the opening or closing of the N valve assemblies according to the temperature difference.

2. The control device of an air conditioning system according to claim 1, wherein a plurality of temperature sections are configured, the plurality of temperature sections corresponding to a plurality of opening numbers, respectively, wherein,

the control unit is further used for acquiring a temperature interval to which the temperature difference belongs and controlling the N valve assemblies according to the opening number corresponding to the temperature interval to which the temperature difference belongs.

3. The control device of an air conditioning system according to claim 1 or 2, wherein when the air conditioning system performs cooling, the control unit is further configured to:

when the temperature difference is larger than a first temperature, controlling any one of the N valve components to be opened;

when the temperature difference is greater than or equal to a second temperature and less than or equal to a first temperature, controlling any M of the N valve assemblies to be opened, wherein M is an integer greater than 1 and less than N;

and when the temperature difference is smaller than the second temperature, controlling the N valve components to be opened.

4. The apparatus of claim 1, wherein the N branches are disposed at a first port of the outdoor heat exchanger, and the first temperature detecting unit is disposed at the first port of the indoor heat exchanger, so as to obtain the temperature of the refrigerant of the indoor heat exchanger by detecting the temperature of the refrigerant at the first port of the indoor heat exchanger.

5. The control device of claim 1, wherein the control unit is further configured to obtain an operating frequency of the air conditioning system, and control the N valve assemblies according to the temperature difference when the operating frequency of the air conditioning system is less than a preset frequency.

6. An air conditioning system characterized by comprising the control device of the air conditioning system according to any one of claims 1 to 5.

7. A control method of an air conditioning system is characterized in that the air conditioning system comprises a compressor, an outdoor heat exchanger, an indoor heat exchanger, N branches and N valve components, a first port of the outdoor heat exchanger is connected with the compressor through a first pipeline, a first port of the indoor heat exchanger is connected with the compressor through a third pipeline, a second port of the outdoor heat exchanger is connected with the indoor heat exchanger through a second pipeline, a throttling device is arranged on the second pipeline, the N branches are connected in parallel, the N branches connected in parallel are connected with the first pipeline in parallel or in series, the N valve components are correspondingly arranged on the N branches, each valve component is used for controlling the opening or closing of the corresponding branch, N is an integer greater than 1, and the method comprises the following steps:

detecting the temperature of a refrigerant of the indoor heat exchanger;

detecting a suction temperature of the compressor;

and acquiring the temperature difference between the suction temperature of the compressor and the temperature of a refrigerant of the indoor heat exchanger, and controlling the opening or closing of the N valve assemblies according to the temperature difference.

8. The method of claim 7, wherein constructing a plurality of temperature zones corresponding to a plurality of opening numbers, respectively, and controlling the opening or closing of the N valve assemblies according to the temperatures comprises:

acquiring a temperature interval to which the temperature difference belongs;

and controlling the N valve assemblies according to the opening number corresponding to the temperature interval to which the temperature difference belongs.

9. The method for controlling an air conditioning system according to claim 7 or 8, wherein the controlling the opening or closing of the N valve assemblies according to the temperature difference when the air conditioning system performs cooling includes:

when the temperature difference is larger than a first temperature, controlling any one of the N valve components to be opened;

when the temperature difference is greater than or equal to a second temperature and less than or equal to a first temperature, controlling any M of the N valve assemblies to be opened, wherein M is an integer greater than 1 and less than N;

and when the temperature difference is smaller than the second temperature, controlling the N valve components to be opened.

10. The control method of the air conditioning system according to claim 7, wherein the refrigerant temperature of the indoor heat exchanger is obtained by detecting a refrigerant temperature of the first port of the indoor heat exchanger.

11. The control method of an air conditioning system according to claim 7, further comprising:

acquiring the operating frequency of the air conditioning system;

and when the running frequency of the air conditioning system is less than a preset frequency, controlling the N valve assemblies according to the temperature difference.

12. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that the program, when executed by a processor, implements the control method of an air conditioning system according to any one of claims 7 to 11.

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