技术领域technical field
本发明涉及多联式空调机组，具体讲是一种多联式空调机组制冷时防止室外机冷媒偏流的控制方法。The invention relates to a multi-connected air-conditioning unit, in particular to a control method for preventing the refrigerant bias flow of an outdoor unit when the multi-connected air-conditioning unit is cooling.
背景技术Background technique
现有技术的多联式空调机组包括多个相互并联的室外机、多个相互并联的室内机以及连接各室内机和各室外机的两根冷媒流通总管。并联后的多个室外机通过两根冷媒流通总管与并联后的多个室内机连通。 The multi-connected air conditioner unit in the prior art includes a plurality of outdoor units connected in parallel, a plurality of indoor units connected in parallel, and two refrigerant circulation main pipes connecting each indoor unit and each outdoor unit. The multiple outdoor units connected in parallel communicate with the multiple indoor units connected in parallel through two main refrigerant circulation pipes. the
每个室外机包括压缩机、油分离器、四通换向阀、室外换热器（制冷模式时为冷凝器）、储液器和气液分离器。压缩机出口与油分离器的一端连通，油分离器的另一端与四通换向阀的第一阀口连通，四通换向阀第二阀口与室外换热器一端连通，室外换热器另一端与储液器的一端连通，储液器的另一端与两根冷媒流通总管中的一根通过一根冷媒液管连通，该冷媒液管上设有电磁阀，而两根冷媒流通总管中的另一根冷媒流通总管与每个室外机的四通换向阀第三阀口连通，四通换向阀第四阀口与气液分离器的一端连接，气液分离器的另一端与压缩机入口连通。Each outdoor unit includes a compressor, oil separator, four-way reversing valve, outdoor heat exchanger (condenser in cooling mode), liquid receiver and gas-liquid separator. The outlet of the compressor communicates with one end of the oil separator, the other end of the oil separator communicates with the first valve port of the four-way reversing valve, the second valve port of the four-way reversing valve communicates with one end of the outdoor heat exchanger, and the outdoor heat exchange The other end of the liquid receiver communicates with one end of the liquid receiver, and the other end of the liquid receiver communicates with one of the two refrigerant circulation main pipes through a refrigerant liquid pipe. The refrigerant liquid pipe is equipped with a solenoid valve, and the two refrigerant flow pipes Another refrigerant circulation main pipe in the main pipe is connected with the third valve port of the four-way reversing valve of each outdoor unit, the fourth valve port of the four-way reversing valve is connected with one end of the gas-liquid separator, and the other end of the gas-liquid separator One end communicates with the compressor inlet.
每个室内机包括内机电子膨胀阀和室内换热器（制冷模式时为蒸发器），室内换热器的一端与内机电子膨胀阀的一端连通，内机电子膨胀阀的另一端与两根冷媒流通总管中的一根连通，室内换热器的另一端与两根冷媒流通总管中的另一根冷媒流通总管连通。Each indoor unit includes an indoor electronic expansion valve and an indoor heat exchanger (evaporator in cooling mode). One end of the indoor heat exchanger is connected to one end of the indoor electronic expansion valve, and the other end of the indoor electronic expansion valve is connected to the two One of the two refrigerant circulation main pipes is connected, and the other end of the indoor heat exchanger is connected with the other refrigerant circulation main pipe of the two refrigerant circulation main pipes.
制冷模式时，四通换向阀的第一阀口与第二阀口连通，第三阀口与第四阀口连通，即冷媒沿着压缩机、室外换热器、室内换热器、压缩机这个路线循环。In cooling mode, the first valve port of the four-way reversing valve is connected to the second valve port, and the third valve port is connected to the fourth valve port, that is, the refrigerant flows along the compressor, outdoor heat exchanger, indoor heat exchanger, compression The machine loops this route.
室外换热器的换热盘管的中部设有第一温度感应器，室外换热器的换热盘管的出口设有第二温度感应器，压缩机的出口设有一个压力传感器。上述的两个温度感应器、一个压力传感器及储液器和一根冷媒流通总管之间的冷媒液管上的电磁阀均与空调主控制器电连接。The middle part of the heat exchange coil of the outdoor heat exchanger is provided with a first temperature sensor, the outlet of the heat exchange coil of the outdoor heat exchanger is provided with a second temperature sensor, and the outlet of the compressor is provided with a pressure sensor. The above-mentioned two temperature sensors, one pressure sensor and the electromagnetic valve on the refrigerant liquid pipe between the liquid reservoir and a refrigerant circulation main pipe are all electrically connected to the main controller of the air conditioner.
多联式空调机组会根据内机负荷需求来调节工作的室外机的数目，内机能力需求高的时候，全部室外机运行，内机能力需求低的时候，只有部分室外机运行。如果部分室外机长期运行而另外的室外机长期不运行，就容易导致制冷剂偏流，即运行的室外机的冷媒过多，不运行的室外机冷媒过少，一旦室外机的冷媒过多，则容易出现高压故障，缩短机组的使用寿命。The multi-connected air conditioner unit will adjust the number of working outdoor units according to the demand of the indoor unit load. When the demand for the capacity of the indoor units is high, all the outdoor units will run. When the demand for the capacity of the indoor units is low, only some of the outdoor units will run. If some outdoor units run for a long time and other outdoor units do not run for a long time, it will easily lead to refrigerant deviation, that is, the running outdoor unit has too much refrigerant, and the non-operating outdoor unit has too little refrigerant. Once the outdoor unit has too much refrigerant, the It is prone to high-voltage faults and shortens the service life of the unit.
发明内容Contents of the invention
本发明要解决的技术问题是，提供一种能自动调节的多联式空调机组制冷时防止室外机冷媒偏流的控制方法。The technical problem to be solved by the present invention is to provide a control method for preventing the refrigerant drift of the outdoor unit during refrigeration of the multi-connected air conditioner unit capable of automatic adjustment.
本发明的技术解决方案是，提供一种多联式空调机组制冷时防止室外机冷媒偏流的控制方法，其具体步骤如下：The technical solution of the present invention is to provide a control method for preventing the refrigerant drift of the outdoor unit during cooling of the multi-connected air conditioner unit, and the specific steps are as follows:
a、将多联式空调机组调节至制冷模式，并将部分室外机的压缩机开机运行一段时间，而另外的室外机不开机；a. Adjust the multi-connected air conditioner unit to the cooling mode, and turn on the compressors of some outdoor units for a period of time, while the other outdoor units are not turned on;
b、通过正在运行的室外机的室外换热器的盘管中部的第一温度感应器测量该室外机的盘管中部温度Tcm并将测温结果发送给空调主控制器；通过该室外机的室外换热器的盘管出口的第二温度感应器测量该室外机的盘管出口温度Tdef并将测温结果发送给空调主控制器，再计算出Tcm减去Tdef的差值△T；b. Measure the temperature Tcm of the middle part of the coil of the outdoor unit through the first temperature sensor in the middle of the coil of the outdoor heat exchanger of the outdoor unit that is running, and send the temperature measurement result to the main controller of the air conditioner; The second temperature sensor at the coil outlet of the outdoor heat exchanger measures the temperature Tdef of the coil outlet of the outdoor unit and sends the temperature measurement result to the main controller of the air conditioner, and then calculates the difference between Tcm and Tdef ΔT;
c、判断△T是否大于或等于4且该室外机的盘管中部温度Tcm是否大于55℃，如果两个条件都满足，则进入步骤e；如果两个条件都不满足，则进入步骤f；如果有一个条件不满足，进入下一步；c. Determine whether △T is greater than or equal to 4 and whether the temperature Tcm in the middle of the coil of the outdoor unit is greater than 55°C. If both conditions are met, proceed to step e; if both conditions are not satisfied, proceed to step f ; If one of the conditions is not met, go to the next step;
d、通过正在运行的室外机的压缩机出口的压力传感器测量该室外机的压缩机出口压力值P，并将结果发送给空调主控制器，判断压缩机出口压力值P是否大于4Mpa，如果是则进入步骤e，如果否，则直接进入步骤f；d. Measure the compressor outlet pressure P of the outdoor unit that is running through the pressure sensor at the compressor outlet of the outdoor unit, and send the result to the main controller of the air conditioner to determine whether the compressor outlet pressure P is greater than 4Mpa, if so Then enter step e, if not, then directly enter step f;
e、打开不运行的室外机的冷媒液管上的电磁阀，直至运行的室外机的盘管中部温度Tcm小于52℃或者运行的室外机的压缩机出口压力值P小于3.1Mpa，再关闭不运行的室外机的冷媒液管上的电磁阀；e. Open the solenoid valve on the refrigerant liquid pipe of the non-operating outdoor unit until the temperature Tcm in the middle of the coil of the operating outdoor unit is less than 52°C or the pressure value P of the compressor outlet of the operating outdoor unit is less than 3.1Mpa, then close it The solenoid valve on the refrigerant liquid pipe of the outdoor unit that is not in operation;
f、每间隔一段时间，重复步骤b~e，直至停机。f. Repeat steps b~e at regular intervals until the machine stops.
该控制方法的原理为：多联式空调机组制冷运行时，发现室外换热器的盘管的中部和出口处的温差大于4℃，就说明该室外机在正常制冷，一旦该室外机的压缩机出口压力过大或者室外换热器盘管中部温度过高，就能判断出该室外机的冷媒过多，出现偏流，此时，打开未运行的室外机的冷媒液管的电磁阀，就能使得冷媒过多的室外机的冷媒从该电磁阀进入未运行的室外机的储液器和室外换热器中，使得正在运行的冷媒过多的室外机中的冷媒减少，压力降低，缓解改善冷媒偏流。The principle of this control method is: when the multi-connected air conditioner unit is in cooling operation, it is found that the temperature difference between the middle part and the outlet of the coil of the outdoor heat exchanger is greater than 4°C, which means that the outdoor unit is cooling normally. If the outlet pressure of the outdoor unit is too high or the temperature in the middle of the outdoor heat exchanger coil is too high, it can be judged that the refrigerant in the outdoor unit is too much and there is a bias flow. At this time, open the solenoid valve of the refrigerant liquid pipe of the outdoor unit that is not running. It can make the refrigerant of the outdoor unit with too much refrigerant enter the liquid receiver and outdoor heat exchanger of the outdoor unit that is not running through the solenoid valve, so that the refrigerant in the outdoor unit that is running with too much refrigerant will be reduced, and the pressure will be reduced. Improve refrigerant drift.
采用以上方法，本发明多联式空调机组制冷时防止室外机冷媒偏流的控制方法与现有技术相比，具有以下优点： By adopting the above method, the control method for preventing the refrigerant drift of the outdoor unit during cooling of the multi-connected air-conditioning unit of the present invention has the following advantages compared with the prior art:
通过该控制方法，能有效缓解改善多联式空调机组不同室外机冷媒偏流的状况，避免冷媒多的室外机出现高压故障，延长机组的使用寿命，同时防止冷媒过少的室外机制冷效果不好，而该控制方法中的几个判断数据，如盘管中部温度Tcm是否大于55℃、压缩机出口压力值P是否大于4Mpa、△T是否大于或等于4以及判断调节过程结束的判断数据压缩机出口压力值P小于3.1Mpa、室外机的盘管中部温度Tcm小于52℃等都是经过反复试验筛选和验证的最佳数据，上述一系列数据，即不会过于敏感导致过早过多次调节空耗机组能量，也不会由于过于迟钝导致调节不及时出现高压故障。Through this control method, it is possible to effectively alleviate and improve the situation of refrigerant deviation in different outdoor units of the multi-connected air-conditioning unit, avoid high-pressure failure of the outdoor unit with a large amount of refrigerant, prolong the service life of the unit, and prevent poor cooling effect of the outdoor unit with too little refrigerant , and several judgment data in this control method, such as whether the temperature Tcm in the middle of the coil is greater than 55°C, whether the compressor outlet pressure value P is greater than 4Mpa, whether △T is greater than or equal to 4, and the judgment data compression for judging the end of the adjustment process The outlet pressure value P of the outdoor unit is less than 3.1Mpa, and the temperature Tcm in the middle of the coil of the outdoor unit is less than 52°C. These are the best data that have been screened and verified through repeated tests. The energy consumption of the air-consumption unit can be adjusted again and again, and high-voltage failures will not occur if the adjustment is not timely due to too slow.
作为改进，步骤a所述的一段时间是指5~10分钟，即压缩机运行5~10分钟后开始调节偏流现象，因为该多联式空调机组运行一段时间后，才开始出现偏流现象的，通过试验证明，运行5~10分钟后调节比较准确，太早调节，根本不会出现偏流，没必要调节，太晚调节的话偏流导致的高压故障已经造成不良影响了。As an improvement, the period of time mentioned in step a refers to 5 to 10 minutes, that is, the bias flow phenomenon starts to be adjusted after the compressor runs for 5 to 10 minutes, because the bias flow phenomenon begins to appear after the multi-connected air conditioner unit has been running for a period of time. The test proves that the adjustment is more accurate after 5-10 minutes of operation. If the adjustment is too early, there will be no bias current at all. There is no need to adjust it. If the adjustment is too late, the high voltage fault caused by the bias current has already caused adverse effects.
作为再改进，步骤a所述的一段时间是指10分钟，即压缩机运行10分钟这个时间点开始调节偏流现象，通过反复试验证明，10分钟这个时间点最准确，太早调节，根本不会出现偏流，没必要调节，太晚调节的话偏流导致的高压故障已经造成不良影响了。As a further improvement, the period of time mentioned in step a refers to 10 minutes, that is, the time point when the compressor runs for 10 minutes to adjust the bias flow phenomenon. Through repeated experiments, it has been proved that the time point of 10 minutes is the most accurate, and if it is adjusted too early, it will not happen at all. There is no need to adjust the bias current, if the adjustment is too late, the high voltage fault caused by the bias current has already caused adverse effects.
作为再进一步改进，步骤f所述的一段时间是指10~30秒，即每次调节的间隔为10~30秒，对偏流的调节效果较好，这是经过试验得出的，如果调节太频繁，没有必要；如果调节次数太少，对偏流调节的力度不够。As a further improvement, the period of time mentioned in step f refers to 10-30 seconds, that is, the interval of each adjustment is 10-30 seconds, and the adjustment effect on bias current is better. This is obtained through experiments. If the adjustment is too Frequent, not necessary; if the number of adjustments is too small, the intensity of bias current adjustment is not enough.
作为还进一步改进，步骤e所述的一段时间是指15秒，即每间隔15秒调节一次，对偏流的调节效果最好，这是经过反复试验得出的，如果调节太频繁，没有必要；如果调节次数太少，对偏流调节的力度不够。As a further improvement, the period of time described in step e refers to 15 seconds, that is, it is adjusted every 15 seconds, and the adjustment effect on the bias current is the best. This is obtained through repeated trials. If the adjustment is too frequent, it is not necessary; If the number of adjustments is too small, the intensity of bias current adjustment is not enough.
附图说明Description of drawings
图1是本发明多联式空调机组制冷时防止室外机冷媒偏流的控制方法的系统原理图。Fig. 1 is a system schematic diagram of the control method for preventing the refrigerant drift of the outdoor unit during cooling of the multi-connected air conditioner unit according to the present invention.
图中所示 1、室外机，2、压缩机，3、室外换热器，4、第一温度感应器，5、压力传感器，6、电磁阀，7、冷媒液管，8、储液器，9、冷媒流通总管，10、第二温度感应器。 As shown in the figure 1. Outdoor unit, 2. Compressor, 3. Outdoor heat exchanger, 4. First temperature sensor, 5. Pressure sensor, 6. Solenoid valve, 7. Refrigerant liquid pipe, 8. Liquid reservoir , 9, refrigerant circulation main pipe, 10, the second temperature sensor. the
具体实施方式Detailed ways
下面结合附图和具体实施例对本发明作进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
如图1所示，本发明多联式空调机组制冷时防止室外机冷媒偏流的控制方法，其具体步骤如下。As shown in FIG. 1 , the control method of the present invention for preventing the refrigerant drift of the outdoor unit during refrigeration of the multi-connected air conditioner unit has the following specific steps.
a、将多联式空调机组调节至制冷模式，并将部分室外机1的压缩机2开机运行一段时间，而另外的室外机1不开机；该步骤中的一段时间是指5~10分钟，优选10分钟。a. Adjust the multi-connected air conditioner unit to the cooling mode, and start the compressor 2 of some outdoor units 1 to run for a period of time, while the other outdoor units 1 do not start; the period of time in this step refers to 5 to 10 minutes, Preferably 10 minutes.
b、通过正在运行的室外机1的室外换热器3的盘管中部的第一温度感应器4测量该室外机1的盘管中部温度Tcm并将测温结果发送给空调主控制器；通过该室外机1的室外换热器3的盘管出口的第二温度感应器10测量该室外机1的盘管出口温度Tdef并将测温结果发送给空调主控制器，再计算出Tcm减去Tdef的差值△T；其中，每一个正在运行的室外机1的两个数据为一组，空调的主控制器将同一个室外机1的一组数据即该室外机1的Tcm减去Tdef得到差值△T。b. Measure the temperature Tcm in the middle of the coil of the outdoor unit 1 through the first temperature sensor 4 in the middle of the coil of the outdoor heat exchanger 3 of the running outdoor unit 1 and send the temperature measurement result to the main controller of the air conditioner; The second temperature sensor 10 at the coil outlet of the outdoor heat exchanger 3 of the outdoor unit 1 measures the coil outlet temperature Tdef of the outdoor unit 1 and sends the temperature measurement result to the main controller of the air conditioner, and then calculates T The difference △T ofcm minus Tdef ; where, the two data of each running outdoor unit 1 form a group, and the main controller of the air conditioner will use the same group of data of the outdoor unit 1, that is, the data of the outdoor unit 1 Tcm minus Tdef gives the difference ΔT.
c、判断△T是否大于或等于4且该室外机1的盘管中部温度Tcm是否大于55℃，如果两个条件都满足，则进入步骤e；如果两个条件都不满足，则进入步骤f；如果有一个条件不满足，进入下一步；更具体的说，对于正在运行的每一个室外机1来说，必须判断出该室外机1的△T大于或等于4且该室外机1的Tcm大于55℃，才会进入步骤e进行调节，如果两个条件中的一个不满足，则进入下一步继续判断而不调节；如果该室外机1的△T小于4且该室外机1的Tcm小于55℃，就进入步骤f正常运行。c. Determine whether △T is greater than or equal to 4 and whether the temperature Tcm in the middle of the coil of the outdoor unit 1 is greater than 55°C. If both conditions are met, proceed to step e; if both conditions are not satisfied, proceed to step f; if one of the conditions is not met, go to the next step; more specifically, for each outdoor unit 1 that is running, it must be judged that the ΔT of the outdoor unit 1 is greater than or equal to 4 and the ΔT of the outdoor unit 1 When Tcm is greater than 55°C, it will enter step e for adjustment. If one of the two conditions is not satisfied, enter the next step to continue judgment without adjustment; if the △T of the outdoor unit 1 is less than 4 and the outdoor unit 1 If Tcm is less than 55°C, it will enter step f for normal operation.
d、通过正在运行的室外机1的压缩机2出口的压力传感器5测量该室外机1的压缩机2出口压力值P，并将结果发送给空调主控制器，判断压缩机2出口压力值P是否大于4Mpa，如果是则进入步骤e，如果否，则直接进入步骤f。d. Measure the outlet pressure P of the compressor 2 of the outdoor unit 1 through the pressure sensor 5 at the outlet of the compressor 2 of the outdoor unit 1 that is running, and send the result to the main controller of the air conditioner to judge the outlet pressure P of the compressor 2 Whether it is greater than 4Mpa, if yes, go to step e, if not, go to step f directly.
e、打开不运行的室外机1的冷媒液管7上的电磁阀6，直至运行的室外机1的盘管中部温度Tcm小于52℃或者运行的室外机1的压缩机2出口压力值P小于3.1Mpa，再关闭不运行的室外机1的冷媒液管7上的电磁阀6。该电磁阀6是位于室外机1的储液器8和多联式空调机组的一根冷媒流通总管9之间的冷媒液管7上的电磁阀6，一旦打开不运行的室外机1的电磁阀6，冷媒就能经该电磁阀6进入不运行的室外机1的储液器8和室外换热器3。当运行的室外机1的盘管中部温度Tcm小于52℃或者运行的室外机1的压缩机2出口压力值P小于3.1Mpa这两个条件满足一个的前提下，就关闭不运行的室外机1的电磁阀6来结束调节。e. Open the solenoid valve 6 on the refrigerant liquid pipe 7 of the non-operating outdoor unit 1 until the temperature Tcm in the middle of the coil of the operating outdoor unit 1 is less than 52°C or the outlet pressure value of the compressor 2 of the operating outdoor unit 1 is P is less than 3.1Mpa, then close the solenoid valve 6 on the refrigerant liquid pipe 7 of the outdoor unit 1 that is not in operation. The solenoid valve 6 is a solenoid valve 6 located on the refrigerant liquid pipe 7 between the liquid reservoir 8 of the outdoor unit 1 and a refrigerant circulation main pipe 9 of the multi-connected air conditioner unit. valve 6, the refrigerant can enter the liquid reservoir 8 and the outdoor heat exchanger 3 of the non-operating outdoor unit 1 through the electromagnetic valve 6. When the temperature Tcm of the coil middle of the operating outdoor unit 1 is less than 52°C or the outlet pressure value P of the compressor 2 of the operating outdoor unit 1 is less than 3.1Mpa, both conditions are met, and the non-operating outdoor unit is turned off. 1 solenoid valve 6 to end regulation.
f、每间隔一段时间，重复步骤b~e，直至停机；该步骤中的一段时间是指10~30秒，优选15秒。f. Repeat steps b to e at intervals until the machine stops; a period of time in this step refers to 10 to 30 seconds, preferably 15 seconds.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210349913.5ACN102914027B (en) | 2012-09-20 | 2012-09-20 | Control method for preventing refrigerant of outdoor unit from bias flowing during refrigeration of multi-split air-conditioning unit |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210349913.5ACN102914027B (en) | 2012-09-20 | 2012-09-20 | Control method for preventing refrigerant of outdoor unit from bias flowing during refrigeration of multi-split air-conditioning unit |
| Publication Number | Publication Date |
|---|---|
| CN102914027A CN102914027A (en) | 2013-02-06 |
| CN102914027Btrue CN102914027B (en) | 2015-01-21 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210349913.5AActiveCN102914027B (en) | 2012-09-20 | 2012-09-20 | Control method for preventing refrigerant of outdoor unit from bias flowing during refrigeration of multi-split air-conditioning unit |
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| CN (1) | CN102914027B (en) |
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| CP01 | Change in the name or title of a patent holder | Address after:315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Patentee after:NINGBO AUX ELECTRIC Co.,Ltd. Address before:315191 Zhejiang city of Ningbo province Jiangshan town Yinzhou District Mingguang Road No. 1166 Patentee before:NINGBO AUX ELECTRIC Co.,Ltd. | |
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| CP03 | Change of name, title or address | Address after:315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Patentee after:NINGBO AUX ELECTRIC Co.,Ltd. Country or region after:China Address before:No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Patentee before:NINGBO AUX ELECTRIC Co.,Ltd. Country or region before:China |