CN118089155A - Control method of air conditioning system and air conditioning system - Google Patents
Control method of air conditioning system and air conditioning system Download PDFInfo
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- CN118089155A CN118089155A CN202211461578.8A CN202211461578A CN118089155A CN 118089155 A CN118089155 A CN 118089155A CN 202211461578 A CN202211461578 A CN 202211461578A CN 118089155 A CN118089155 A CN 118089155A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 54
- 239000003507 refrigerant Substances 0.000 claims abstract description 395
- 239000007788 liquid Substances 0.000 claims abstract description 150
- 230000006835 compression Effects 0.000 claims description 18
- 238000007906 compression Methods 0.000 claims description 18
- 238000004891 communication Methods 0.000 description 17
- 238000001704 evaporation Methods 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 239000002826 coolant Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- RWRIWBAIICGTTQ-UHFFFAOYSA-N difluoromethane Chemical compound FCF RWRIWBAIICGTTQ-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to the technical field of air conditioners, and particularly provides a control method of an air conditioning system and the air conditioning system. The method aims at solving the problems that after an air conditioning system is repaired in the prior art by adopting a mode that a gas-liquid separator is used for storing liquid refrigerants, the liquid refrigerants in the gas-liquid separator can enter the compressor in a large amount when the compressor is started, and the compressor liquid is compressed and damaged. For this purpose, the control method of the present invention comprises the steps of: s110: the air conditioning system is opened, the first control valve is closed, and the second control valve is opened; s120: opening a third control valve to a preset opening degree, and throttling the refrigerant flowing from the third refrigerant pipeline to the second refrigerant pipeline through the third control valve; s130: acquiring a refrigerant pressure P1 in a third refrigerant pipeline, acquiring a refrigerant pressure P2 in a second refrigerant pipeline, and acquiring a preset refrigerant pressure difference value P3; s140: and calculating a differential pressure value P4 between the P1 and the P2, comparing the P3 and the P4, and selectively controlling the third control valve to be closed according to the comparison result.
Description
Technical Field
The invention relates to the technical field of air conditioners, and particularly provides a control method of an air conditioning system and the air conditioning system.
Background
Difluoromethane is a halogenated hydrocarbon (chemical formula: CH 2F2), abbreviated as R32. Is gas at normal temperature, is colorless transparent liquid under self pressure, is easy to dissolve in oil and difficult to dissolve in water, and is a refrigerant with zero ozone depletion potential. The method is mainly applied to the multi-split system. However, the R32 refrigerant has the greatest defects of inflammability and explosiveness, belongs to a high-risk refrigerant, and is easy to generate danger if leakage occurs in the using process.
The key point of the prior art is that after leakage, the R32 sensor detects the concentration, then the alarm is stopped, after-sales personnel maintenance is waited, and during the period of waiting for the after-sales personnel maintenance, in order to avoid the R32 refrigerant to be always in a leakage state, the refrigerant is recovered into the outdoor heat exchanger, so that the refrigerant in a pipeline is reduced, and the leakage of the refrigerant is controlled.
However, when the refrigerant in the air conditioning system is generally more, the refrigerant in the air conditioning system is considered to be recovered into the outdoor heat exchanger and the gas-liquid separator, and a large amount of liquid refrigerant exists in the gas-liquid separator, so that after the system is repaired, the liquid refrigerant in the gas-liquid separator enters the compressor in a large amount when the compressor is started, and the compressor liquid is compressed and damaged. Therefore, how to avoid the refrigerant in the gas-liquid separator from entering the compressor in a large amount when the compressor is started is a problem to be solved in the art.
Disclosure of Invention
The invention aims to solve the technical problems, namely, the problems that the prior air conditioning system is repaired in a mode of storing liquid refrigerant by adopting a gas-liquid separator, and the liquid refrigerant in the gas-liquid separator can enter the compressor in a large amount when the compressor is started, so that the liquid of the compressor is compressed and damaged are solved.
According to a first aspect of the present invention, there is disclosed a control method of an air conditioning system having a refrigerant compression cycle including a gas-liquid separator, a first control valve, a second control valve, a third control valve, an outdoor heat exchanger, an indoor heat exchanger, a first refrigerant line, a second refrigerant line, a third refrigerant line, a first sensor and a second sensor, the outdoor heat exchanger being in communication with the first control valve, the first control valve being in communication with the second control valve through the first refrigerant line, the second control valve being in communication with the indoor heat exchanger, a first end of the third control valve being in communication with the first refrigerant line through the second refrigerant line, a second end of the third control valve being in communication with the gas-liquid separator through the third refrigerant line, the first sensor being for detecting a refrigerant pressure in the third refrigerant line, the second sensor being for detecting a refrigerant pressure in the second line, the control method comprising the steps of: s110: the air conditioning system is started, the first control valve is closed, and the second control valve is opened; s120: opening the third control valve to a preset opening degree, and throttling the refrigerant flowing from the third refrigerant pipeline to the second refrigerant pipeline through the third control valve; s130: acquiring the refrigerant pressure P1 in the third refrigerant pipeline, acquiring the refrigerant pressure P2 in the second refrigerant pipeline, and acquiring a preset refrigerant pressure difference value P3; s140: and calculating a differential pressure value P4 between the P1 and the P2, comparing the P3 and the P4, and selectively controlling the third control valve to be closed according to the comparison result.
Further, the step S140 further includes the steps of: s141: if P4 is greater than P3, controlling the third control valve to keep the current opening degree, and returning to the step 130; and if P4 is less than or equal to P3, controlling the third control valve to be closed.
Further, the refrigerant compression cycle further includes a compressor, a four-way valve, a fourth control valve and a fifth control valve, the fourth control valve is disposed on the refrigerant pipeline between the second control valve and the indoor heat exchanger, the indoor heat exchanger is further communicated with the fifth control valve, the fifth control valve is communicated with the four-way valve, and the step S120 further includes the following steps: and after the third control valve is opened, continuing to open the fifth control valve, and opening the fourth control valve to a preset opening degree so as to throttle the refrigerant flowing to the indoor heat exchanger.
Further, the control method includes the steps of: s150: and after the third control valve is closed, starting the compressor, and enabling the air conditioning system to enter a normal operation mode.
According to the control method of the air conditioning system, the liquid refrigerant in the third refrigerant pipeline is throttled by the third control valve to form the gaseous refrigerant to enter the second refrigerant pipeline, the pressure difference P3 is formed between the P1 and the P2, when the liquid refrigerant in the gas-liquid separator is more, the pressure difference P3 is larger, and as the liquid refrigerant in the third refrigerant pipeline continuously enters the second refrigerant pipeline, the liquid refrigerant in the gas-liquid separator is less and less, the refrigerant pressure of the third refrigerant pipeline also continuously drops, so that the P3 is gradually reduced, that is, the refrigerant pressure difference P3 between the refrigerant pressure P2 in the second refrigerant pipeline and the refrigerant pressure P1 in the third refrigerant pipeline can indirectly reflect the height of the liquid refrigerant in the gas-liquid separator, therefore, by the preset pressure difference P4 (when the liquid level of the liquid refrigerant in the gas-liquid separator is reduced below an oil return hole, the corresponding pressure difference P1 and P2 is formed), the actual pressure difference P3 is compared with the P4, and whether the liquid level in the gas-liquid separator is controlled by the liquid level controller is further prevented from being started or not is further ensured, so that the risk of normally compressing the liquid compressor is prevented.
According to a second aspect of the present invention, there is also disclosed a control method of an air conditioning system having a refrigerant compression cycle including a gas-liquid separator, a first control valve, a second control valve, a third control valve, an outdoor heat exchanger, an indoor heat exchanger, a first refrigerant pipe, a second refrigerant pipe, a third refrigerant pipe, a first sensor and a second sensor, the outdoor heat exchanger being in communication with the first control valve, the first control valve being in communication with the second control valve through the first refrigerant pipe, the second control valve being in communication with the indoor heat exchanger, a first end of the third control valve being in communication with the first refrigerant pipe through the second refrigerant pipe, a second end of the third control valve being in communication with the inside of the gas-liquid separator through the third refrigerant pipe, the first sensor being for detecting a refrigerant temperature in the third refrigerant pipe, the second sensor being for detecting a refrigerant temperature in the second refrigerant pipe, the method comprising the steps of: s210: the air conditioning system is started, the first control valve is closed, and the second control valve is opened; s220: opening the third control valve to a preset opening degree, and throttling the refrigerant flowing from the third refrigerant pipeline to the second refrigerant pipeline through the third control valve; s230: acquiring a refrigerant temperature T1 in the third refrigerant pipeline, acquiring a refrigerant temperature T2 in the second refrigerant pipeline, and acquiring a preset refrigerant pressure difference value T3; s240: and calculating a differential pressure value T4 between the T1 and the T2, comparing the T3 with the T4, and selectively controlling the third control valve to be closed according to the comparison result.
Further, the step S240 further includes the steps of: s241: if T4 is greater than T3, controlling the third control valve to keep the current opening degree, and returning to the step 230; and if T4 is less than or equal to T3, controlling the third control valve to be closed.
Further, the refrigerant compression cycle further includes a compressor, a four-way valve, a fourth control valve and a fifth control valve, the fourth control valve is disposed on the refrigerant pipeline between the second control valve and the indoor heat exchanger, the indoor heat exchanger is further in communication with the fifth control valve, the fifth control valve is in communication with the four-way valve, and the step S220 further includes the steps of: and after the third control valve is opened, continuing to open the fifth control valve, and opening the fourth control valve to a preset opening degree so as to throttle the refrigerant flowing to the indoor heat exchanger.
Further, the control method includes the steps of: s250: and after the third control valve is closed, starting the compressor, and enabling the air conditioning system to enter a normal operation mode.
According to the control method of the air conditioning system, the liquid refrigerant in the third refrigerant pipeline is throttled by the third control valve to form the gaseous refrigerant to enter the second refrigerant pipeline, the temperature difference T3 is formed between T1 and T2, when the liquid refrigerant in the gas-liquid separator is more, the temperature difference T3 is larger, and as the liquid refrigerant in the third refrigerant pipeline continuously enters the second refrigerant pipeline, the liquid refrigerant in the gas-liquid separator is less and less, the refrigerant temperature of the third refrigerant pipeline also continuously drops, so that the T3 is gradually reduced, that is, the temperature difference T3 between the refrigerant temperature T2 in the second refrigerant pipeline and the refrigerant temperature T1 in the third refrigerant pipeline can indirectly reflect the height of the liquid refrigerant in the gas-liquid separator, therefore, by comparing the actual temperature difference T3 with the temperature difference T4 when the liquid level of the liquid refrigerant in the gas-liquid separator is reduced below an oil return hole and corresponds to the temperature difference value formed between T1 and T2, the liquid level control in the gas-liquid separator can be judged, and the risk of the gas-liquid separator can be further reduced, so that the compressor can be normally started or not is further controlled, and the risk of compressor can be further reduced.
According to a third aspect of the present invention, there is also disclosed a control method of an air conditioning system having a refrigerant compression cycle including a gas-liquid separator, a first control valve, a second control valve, a third control valve, an outdoor heat exchanger, an indoor heat exchanger, a first refrigerant line, a second refrigerant line, a third refrigerant line, a first sensor, a second sensor, a third sensor, and a fourth sensor, the outdoor heat exchanger being in communication with the first control valve, the first control valve being in communication with the second control valve through the first refrigerant line, the second control valve being in communication with the indoor heat exchanger, a first end of the third control valve being in communication with the first refrigerant line through the second refrigerant line, a second end of the third control valve being in communication with the gas-liquid separator through the third refrigerant line, the first sensor being for detecting a pressure in the third refrigerant line, the second sensor being for detecting a temperature in the third refrigerant line, the method comprising: s310: the air conditioning system is started, the first control valve is closed, and the second control valve is opened; s320: opening the third control valve to a preset opening degree, and throttling the refrigerant flowing from the third refrigerant pipeline to the second refrigerant pipeline through the third control valve; s330: acquiring a refrigerant pressure P1 and a refrigerant temperature T1 in the third refrigerant pipeline, acquiring a refrigerant pressure P2 and a refrigerant temperature T2 in the second refrigerant pipeline, and acquiring a preset refrigerant pressure difference value T3; s340: calculating a pressure difference value P4 between P1 and P2, and comparing P3 and P4; calculating a differential pressure value T4 between T1 and T2, and comparing T3 and T4; if P4 is greater than P3 and T4 is greater than T3, controlling the third control valve to maintain the current opening degree, and returning to step 330; and if P4 is less than or equal to P3 and T4 is less than or equal to T3, controlling the third control valve to be closed.
In the control method of the air conditioning system, the liquid refrigerant in the third refrigerant pipeline is throttled by the third control valve to form a gaseous refrigerant to enter the second refrigerant pipeline, the pressure difference P3 is formed between P1 and P2, meanwhile, the temperature difference T3 is formed between T1 and T2, when the liquid refrigerant in the gas-liquid separator is more, the pressure difference P3 and T3 are larger, and as the liquid refrigerant in the third refrigerant pipeline continuously enters the second refrigerant pipeline, the liquid refrigerant in the gas-liquid separator is less and less, the refrigerant pressure of the third refrigerant pipeline is continuously reduced, the temperature in the second refrigerant pipeline is continuously reduced, the P3 and T3 are gradually reduced, namely, the pressure difference P3 between the refrigerant pressure P2 in the second refrigerant pipeline and the refrigerant pressure P1 in the third refrigerant pipeline is passed, and the refrigerant temperature difference value T3 between the refrigerant temperature T2 in the second refrigerant pipeline and the refrigerant temperature T1 in the third refrigerant pipeline can indirectly reflect the height of the liquid refrigerant in the gas-liquid separator, so that the condition of the liquid level in the gas-liquid separator can be judged by comparing the actual pressure difference value P3 with the actual temperature difference value T4, and whether the third control valve is closed or not is further controlled, so that the normal start of the compressor can be ensured, and the liquid impact risk of the compressor is reduced, by the preset pressure difference value P4 (the pressure difference value formed between the corresponding P1 and the P2 when the liquid level of the liquid refrigerant in the gas-liquid separator is reduced below an oil return hole) and the preset temperature difference value T4 (the temperature difference value formed between the corresponding T1 and the T2) when the liquid level of the liquid refrigerant in the gas-liquid separator is reduced below the oil return hole.
According to a fourth aspect of the present invention, an air conditioning system is also disclosed, which is controlled by adopting the control method described above.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural view of an air conditioning system according to a first embodiment of the present invention;
Fig. 2 is a flowchart of a control method of an air conditioning system according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of an air conditioning system according to a second embodiment of the present invention;
Fig. 4 is a flowchart of a control method of an air conditioning system according to a second embodiment of the present invention;
fig. 5 is a schematic structural view of an air conditioning system according to a third embodiment of the present invention;
Fig. 6 is a flowchart of a control method of an air conditioning system according to a third embodiment of the present invention;
List of reference numerals:
10. A gas-liquid separator; 21. a first control valve; 22. a second control valve; 23. a third control valve; 24. a fourth control valve; 25. a fifth control valve; 30. an outdoor heat exchanger; 40. an indoor heat exchanger; 51. a first refrigerant line; 52. a second refrigerant line; 53. a third refrigerant line; 61. a first sensor; 62. a second sensor; 63. a third sensor; 64. a fourth sensor; 70. a compressor; 80. and a four-way valve.
Detailed Description
The invention is further illustrated by the following examples, but the scope of the invention is not limited to the description.
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in other environments. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "configured," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected, can be indirectly connected through an intermediate medium, and can also be communicated with the inside of two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
After the refrigerant R32 leaks, the R32 sensor detects an after-alarm to stop, and waits for after-sales personnel to repair, and during waiting for after-sales personnel to repair, in order to avoid that the R32 refrigerant is always in a leakage state, the refrigerant is recovered into the outdoor heat exchanger 30, so that the refrigerant in the pipeline is reduced, and the leakage of the refrigerant is controlled.
However, when the air conditioning system has more cooling medium, too much cooling medium enters the outdoor heat exchanger 30 during recovery, and when the external temperature is too high, part of the liquid cooling medium in the outdoor heat exchanger 30 is easily vaporized, so that the internal pressure of the outdoor heat exchanger 30 is increased, and the outdoor heat exchanger 30 is damaged. In order to avoid damage to the outdoor heat exchanger 30, it is considered to recover part of the refrigerant of the air conditioning system into the gas-liquid separator 10, thereby sharing the refrigerant storage pressure of the outdoor heat exchanger 30.
After the system is maintained and needs to be started, because a large amount of liquid refrigerant exists in the gas-liquid separator 10, the liquid refrigerant in the gas-liquid separator 10 can enter the compressor 70 in a large amount during the starting of the compressor 70, so that the compressor liquid is compressed and damaged. Therefore, how to avoid the refrigerant in the gas-liquid separator 10 from entering the compressor 70 in a large amount when the compressor 70 is started is a problem to be solved in the art.
In order to solve the above problems, as in the first embodiment of the present invention shown in fig. 1 and 2, a control method of an air conditioning system is disclosed, the air conditioning system has a refrigerant compression cycle including a gas-liquid separator 10, a first control valve 21, a second control valve 22, a third control valve 23, a fourth control valve 24, a fifth control valve 25, an outdoor heat exchanger 30, an indoor heat exchanger 40, a first refrigerant line 51, a second refrigerant line 52, a third refrigerant line 53, a first sensor 61, a second sensor 62, a compressor 70, and a four-way valve 80.
The exhaust port of the compressor 70 is communicated with the first end of the four-way valve 80, the second end of the four-way valve 80 is communicated with the first end of the outdoor heat exchanger 30, the second end of the outdoor heat exchanger 30 is communicated with the first end of the first control valve 21, the second end of the first control valve 21 is communicated with the first end of the second control valve 22 through the first refrigerant pipeline 51, the second end of the second control valve 22 is communicated with the first end of the fourth control valve 24, the second end of the fourth control valve 24 is communicated with the first end of the indoor heat exchanger 40, the second end of the indoor heat exchanger 40 is communicated with the first end of the fifth control valve 25, the second end of the fifth control valve 25 is communicated with the third end of the four-way valve 80, the fourth end of the four-way valve 80 is communicated with the refrigerant inlet pipe of the gas-liquid separator 10, and the refrigerant outlet pipe of the gas-liquid separator 10 is communicated with the suction port of the compressor 70, thereby forming a refrigerant compression cycle.
The first end of the third control valve 23 is communicated with the first refrigerant pipeline 51 through the second refrigerant pipeline 52, the second end of the third control valve 23 is communicated with the inside of the liquid storage pipe of the gas-liquid separator 10 through the third refrigerant pipeline 53, and the third control valve 23 is an electronic expansion valve.
The first sensor 61 is disposed on the third refrigerant line 53 for detecting the refrigerant pressure in the third refrigerant line 52, and the second sensor 62 is disposed on the second refrigerant line 52 for detecting the refrigerant pressure in the second refrigerant line 52.
The control method comprises the following steps:
s110: the air conditioning system is turned on, the first control valve 21 is closed, and the second control valve 22 is opened.
After the maintenance of the air conditioner, the indoor side pipeline is vacuumized to ensure that the indoor side forms negative pressure, so that the first refrigerant pipeline 51 is communicated with the indoor side pipeline after the second control valve 22, and in order to prevent the refrigerant in the outdoor heat exchanger 30 from flowing out under the action of the negative pressure, the first control valve 21 needs to be closed before the second control valve 22 is opened to prevent the refrigerant in the outdoor heat exchanger 30 from flowing out.
S120: the third control valve 23 is opened to a preset opening, and the refrigerant flowing from the third refrigerant line 53 to the second refrigerant line 52 is throttled by the third control valve 23.
After the third control valve 23 is opened, the gas-liquid separator 10 is communicated with the indoor side pipeline through the third refrigerant pipeline 53, the second refrigerant pipeline 52 and the first refrigerant pipeline 51, and the refrigerant in the gas-liquid separator 10 flows out of the third refrigerant pipeline and flows to the third control valve 23 under the action of negative pressure, and as the third control valve 23 is an electronic expansion valve, the third control valve 23 can play a role in throttling and throttle the refrigerant by opening a smaller opening.
S130: the refrigerant pressure P1 in the third refrigerant pipe 53 is obtained, the refrigerant pressure P2 in the second refrigerant pipe 52 is obtained, and the preset refrigerant pressure difference P3 is obtained.
S140: the differential pressure value P4 between P1 and P2 is calculated, P3 and P4 are compared, and the third control valve 23 is selectively controlled to be closed according to the comparison result.
According to the control method of the air conditioning system, the liquid refrigerant in the third refrigerant pipeline 53 is throttled by the third control valve 23 to form the gaseous refrigerant to enter the second refrigerant pipeline 52, the pressure difference P3 is formed between P1 and P2, when the liquid refrigerant in the gas-liquid separator 10 is more, the pressure difference P3 is larger, as the liquid refrigerant in the third refrigerant pipeline 53 continuously enters the second refrigerant pipeline 52, the liquid refrigerant in the gas-liquid separator 10 is less and less, the refrigerant pressure of the third refrigerant pipeline 53 also continuously drops, so that P3 is gradually reduced, that is, the refrigerant pressure difference P3 between the refrigerant pressure P2 in the second refrigerant pipeline 52 and the refrigerant pressure P1 in the third refrigerant pipeline 53 can indirectly reflect the height of the liquid refrigerant in the gas-liquid separator 10, therefore, by the preset pressure difference P4 (P4 is the pressure difference formed between P1 and P2 when the liquid level of the liquid refrigerant in the gas-liquid separator 10 is reduced below an oil return hole), the actual pressure difference P3 and the liquid refrigerant in the gas-liquid separator 10 are compared, and the liquid level of the gas-liquid separator 10 can be further controlled, and the risk of the compressor 70 can be further reduced, and the compressor can be further controlled to be normally, and the risk of the compressor 70 is further reduced.
The step S140 further includes the steps of:
S141: if P4 > P3, the third control valve 23 is controlled to keep the current opening degree, and the step 130 is returned to; if P4 is less than or equal to P3, the third control valve 23 is controlled to be closed. When P4 > P3, it indicates that the gas-liquid separator 10 has more liquid refrigerant, and the compressor 70 cannot be started normally, so that the current opening of the third control valve 23 needs to be kept; when P4 is less than or equal to P3, the liquid refrigerant in the gas-liquid separator 10 is basically discharged, and the compressor 70 can be normally started, so that the third control valve 23 can be closed, the compressor 70 can be started, and the air conditioning system enters a normal operation mode.
The step S120 further includes the steps of:
After the third control valve 23 is opened, the fifth control valve 25 is continuously opened, and the fourth control valve 24 is opened to a preset opening degree so as to throttle the refrigerant flowing to the indoor heat exchanger 40.
By opening the fifth control valve 25 and opening the fourth control valve 24 to a preset opening, the refrigerant in the first refrigerant pipe can be guided into the indoor heat exchanger 40, so that the refrigerant can be quickly evaporated into a gaseous state, and the evaporation efficiency is improved. In order to improve the evaporation efficiency, a fan of the internal machine can be started to realize forced convection.
As shown in fig. 3 and 4, in a second embodiment of the present invention, a control method of an air conditioning system is also disclosed, and the air conditioning system is basically the same as the first embodiment, except that in the following steps: in the present embodiment, the first sensor 61 is used for detecting the temperature of the refrigerant in the third refrigerant line 53, and the second sensor 62 is used for detecting the temperature of the refrigerant in the second refrigerant line 52.
The control method comprises the following steps:
s210: the air conditioning system is turned on, the first control valve 21 is closed, and the second control valve 22 is opened.
After the maintenance of the air conditioner, the indoor side pipeline is vacuumized to ensure that the indoor side forms negative pressure, so that the first refrigerant pipeline 51 is communicated with the indoor side pipeline after the second control valve 22, and in order to prevent the refrigerant in the outdoor heat exchanger 30 from flowing out under the action of the negative pressure, the first control valve 21 needs to be closed before the second control valve 22 is opened to prevent the refrigerant in the outdoor heat exchanger 30 from flowing out.
S220: the third control valve 23 is opened to a preset opening, and the refrigerant flowing from the third refrigerant line 53 to the second refrigerant line 52 is throttled by the third control valve 23.
After the third control valve 23 is opened, the gas-liquid separator 10 is communicated with the indoor side pipeline through the third refrigerant pipeline 53, the second refrigerant pipeline 52 and the first refrigerant pipeline 51, and the refrigerant in the gas-liquid separator 10 flows out of the third refrigerant pipeline and flows to the third control valve 23 under the action of negative pressure, and as the third control valve 23 is an electronic expansion valve, the third control valve 23 can play a role in throttling and throttle the refrigerant by opening a smaller opening.
S230: acquiring a refrigerant temperature T1 in a third refrigerant pipeline 53, acquiring a refrigerant temperature T2 in a second refrigerant pipeline 52, and acquiring a preset refrigerant pressure difference value T3;
s240: the differential pressure value T4 between T1 and T2 is calculated, T3 and T4 are compared, and the third control valve 23 is selectively controlled to be closed according to the comparison result.
According to the control method of the air conditioning system, the liquid refrigerant in the third refrigerant pipeline 53 is throttled by the third control valve 23 to form the gaseous refrigerant to enter the second refrigerant pipeline 52, the temperature difference T3 is formed between T1 and T2, when the liquid refrigerant in the gas-liquid separator 10 is more, the temperature difference T3 is larger, and as the liquid refrigerant in the third refrigerant pipeline 53 continuously enters the second refrigerant pipeline 52, the liquid refrigerant in the gas-liquid separator 10 is less and less, the refrigerant temperature of the second refrigerant pipeline 52 also continuously decreases, so that the T3 is gradually reduced, that is, the temperature difference T3 between the refrigerant temperature T2 in the second refrigerant pipeline 52 and the refrigerant temperature T1 in the third refrigerant pipeline 53 can indirectly reflect the height of the liquid refrigerant in the gas-liquid separator 10, therefore, by presetting the temperature difference T4 (T4 is the temperature difference value formed between T1 and T2 when the liquid level of the liquid refrigerant in the gas-liquid separator 10 is reduced below an oil return hole), the actual temperature difference T3 and T4 can be compared with the temperature difference T2, and the liquid refrigerant in the gas-liquid separator 10 can be further controlled, and the risk of normal compression of the compressor 70 can be further reduced, and the compressor can be further controlled, and the risk of normal compression can be further reduced, and the compressor 70 can be controlled, and the compressor can be further controlled, and the risk is further reduced, 70.
Further, in step S240, the following steps are further included:
S241: if T4 > T3, controlling the third control valve 23 to keep the current opening degree, and returning to step 230; if T4 is less than or equal to T3, the third control valve 23 is controlled to be closed. When T4 > T3, it indicates that the gas-liquid separator 10 has more liquid refrigerant, and the compressor 70 cannot be started normally, so that the current opening of the third control valve 23 needs to be kept; when T4 is less than or equal to T3, the liquid refrigerant in the gas-liquid separator 10 is basically discharged, and the compressor 70 can be normally started, so that the third control valve 23 can be closed, the compressor 70 can be started, and the air conditioning system enters a normal operation mode.
Further, in step S220, the following steps are further included:
After the third control valve 23 is opened, the fifth control valve 25 is continuously opened, and the fourth control valve 24 is opened to a preset opening degree so as to throttle the refrigerant flowing to the indoor heat exchanger 40.
By opening the fifth control valve 25 and opening the fourth control valve 24 to a preset opening, the refrigerant in the first refrigerant pipe can be guided to the indoor heat exchanger 40, so that part of the refrigerant which is not evaporated is quickly evaporated into a gas state, and in order to improve the evaporation efficiency, a fan of the internal machine can be started, forced pair is realized, and the heat exchange effect is improved.
As shown in fig. 5 and 6, in a third embodiment of the present invention, a control method of an air conditioning system is also disclosed, and the air conditioning system is substantially the same as the first embodiment, except that in the following steps: the refrigerant compression cycle in this embodiment further includes a third sensor 63 and a fourth sensor 64, wherein the third sensor 63 is configured to detect a temperature of the refrigerant in the third refrigerant line 53, and the fourth sensor 64 is configured to detect a temperature of the refrigerant in the second refrigerant line 52.
The control method comprises the following steps:
S310: the air conditioning system is turned on, the first control valve 21 is closed, and the second control valve 22 is opened.
After the maintenance of the air conditioner, the indoor side pipeline is vacuumized to ensure that the indoor side forms negative pressure, so that the first refrigerant pipeline 51 is communicated with the indoor side pipeline after the second control valve 22, and in order to prevent the refrigerant in the outdoor heat exchanger 30 from flowing out under the action of the negative pressure, the first control valve 21 needs to be closed before the second control valve 22 is opened to prevent the refrigerant in the outdoor heat exchanger 30 from flowing out.
S320: the third control valve 23 is opened to a preset opening, and the refrigerant flowing from the third refrigerant line 53 to the second refrigerant line 52 is throttled by the third control valve 23.
After the third control valve 23 is opened, the gas-liquid separator 10 is communicated with the indoor side pipeline through the third refrigerant pipeline 53, the second refrigerant pipeline 52 and the first refrigerant pipeline 51, and the refrigerant in the gas-liquid separator 10 flows out of the third refrigerant pipeline and flows to the third control valve 23 under the action of negative pressure, and as the third control valve 23 is an electronic expansion valve, the third control valve 23 can play a role in throttling and throttle the refrigerant by opening a smaller opening.
S330: the refrigerant pressure P1 and the refrigerant temperature T1 in the third refrigerant pipeline 53 are obtained, the refrigerant pressure P2 and the refrigerant temperature T2 in the second refrigerant pipeline 52 are obtained, and the preset refrigerant pressure difference value T3 is obtained.
S340: calculating a pressure difference value P4 between P1 and P2, and comparing P3 and P4; calculating a differential pressure value T4 between T1 and T2, and comparing T3 and T4; if P4 > P3 and T4 > T3, controlling the third control valve 23 to maintain the current opening degree, and returning to step 330; if P4 is less than or equal to P3 and T4 is less than or equal to T3, the third control valve 23 is controlled to be closed.
In the control method of the air conditioning system of the invention, through the throttling of the third control valve 23, the liquid refrigerant in the third refrigerant pipeline 53 is throttled by the third control valve 23 to form a gaseous refrigerant, the gaseous refrigerant enters the second refrigerant pipeline 52, the pressure difference P3 is formed between P1 and P2, meanwhile, the temperature difference T3 is formed between T1 and T2, when the liquid refrigerant in the gas-liquid separator 10 is more, the pressure differences P3 and T3 are larger, and as the liquid refrigerant in the third refrigerant pipeline 53 continuously enters the second refrigerant pipeline 52, the liquid refrigerant in the gas-liquid separator 10 is less and less, the refrigerant pressure of the third refrigerant pipeline 53 also continuously decreases, the temperature in the second refrigerant pipeline 52 also continuously decreases, so that P3 and T3 are gradually decreased, that is, the refrigerant pressure difference P3 between the refrigerant pressure P2 in the second refrigerant pipeline 52 and the refrigerant pressure P1 in the third refrigerant pipeline 53, and the refrigerant temperature difference T3 between the refrigerant temperature T2 in the second refrigerant line 52 and the refrigerant temperature T1 in the third refrigerant line 53 may indirectly reflect the height of the liquid refrigerant in the gas-liquid separator 10, so that by comparing the actual pressure difference P3 with the actual temperature difference T4, the condition of the liquid level in the gas-liquid separator 10 can be determined by further controlling whether the third control valve 23 is closed or not, thereby ensuring that the compressor 70 can be normally started, by the preset pressure difference P4 (P4 is the pressure difference formed between the corresponding P1 and P2 when the liquid level of the liquid refrigerant in the gas-liquid separator 10 is lowered below the oil return hole) and the preset temperature difference T4 (T4 is the temperature difference formed between the corresponding T1 and T2 when the liquid level of the liquid refrigerant in the gas-liquid separator 10 is lowered below the oil return hole), the risk of liquid hammer of the compressor 70 is reduced.
It should be noted that, when P4 is greater than P3 and T4 is greater than T3, it is indicated that the liquid refrigerant in the gas-liquid separator 10 is more, and the compressor 70 cannot be started normally, so it is necessary to keep the current opening of the third control valve 23; when P4 is less than or equal to P3 and T4 is less than or equal to T3, which indicates that the liquid refrigerant in the gas-liquid separator 10 is basically discharged, the compressor 70 may be normally started, and thus, the third control valve 23 may be closed, and the compressor 70 may be turned on, so that the air conditioning system enters a normal operation mode.
The step S320 further includes the steps of:
After the third control valve 23 is opened, the fifth control valve 25 is continuously opened, and the fourth control valve 24 is opened to a preset opening degree so as to throttle the refrigerant flowing to the indoor heat exchanger 40.
By opening the fifth control valve 25 and opening the fourth control valve 24 to a preset opening, the refrigerant in the first refrigerant pipe can be guided into the indoor heat exchanger 40, so that the refrigerant can be quickly evaporated into a gaseous state, and the evaporation efficiency is improved. In order to improve the evaporation efficiency, a fan of the internal machine can be started to realize forced convection.
According to the fourth embodiment of the invention, an air conditioning system is also disclosed, and the air conditioning system is controlled by adopting the control method.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.
Claims (10)
1. A control method of an air conditioning system, characterized in that the air conditioning system has a refrigerant compression cycle, the refrigerant compression cycle comprises a gas-liquid separator (10), a first control valve (21), a second control valve (22), a third control valve (23), an outdoor heat exchanger (30), an indoor heat exchanger (40), a first refrigerant pipe (51), a second refrigerant pipe (52), a third refrigerant pipe (53), a first sensor (61) and a second sensor (62), the outdoor heat exchanger (30) is communicated with the first control valve (21), the first control valve (21) is communicated with the second control valve (22) through the first refrigerant pipe (51), the second control valve (22) is communicated with the indoor heat exchanger (40), a first end of the third control valve (23) is communicated with the first refrigerant pipe (51) through the second refrigerant pipe (52), a second end of the third control valve (23) is communicated with the second refrigerant pipe (53) through the third refrigerant pipe (53), the first control valve (22) is used for detecting the pressure of the refrigerant in the first refrigerant pipe (61) and the second refrigerant pipe (52) in the method:
s110: the air conditioning system is opened, the first control valve (21) is closed, and the second control valve (22) is opened;
s120: opening the third control valve (23) to a preset opening degree, and throttling the refrigerant flowing from the third refrigerant pipeline (53) to the second refrigerant pipeline (52) through the third control valve (23);
s130: acquiring the refrigerant pressure P1 in the third refrigerant pipeline (53), acquiring the refrigerant pressure P2 in the second refrigerant pipeline (52), and acquiring a preset refrigerant pressure difference value P3;
S140: and calculating a differential pressure value P4 between the P1 and the P2, comparing the P3 and the P4, and selectively controlling the third control valve (23) to be closed according to the comparison result.
2. The control method according to claim 1, characterized in that in said step S140, further comprising the steps of:
S141: if P4 is more than P3, controlling the third control valve (23) to keep the current opening degree, and returning to the step 130; and if P4 is less than or equal to P3, controlling the third control valve (23) to be closed.
3. The control method according to claim 1, wherein the refrigerant compression cycle further includes a compressor (70), a four-way valve (80), a fourth control valve (24) and a fifth control valve (25), the fourth control valve (24) being provided on a refrigerant line between the second control valve (22) and the indoor heat exchanger (40), the indoor heat exchanger (40) further communicating with the fifth control valve (25), the fifth control valve (25) communicating with the four-way valve (80), further comprising the steps of:
After the third control valve (23) is opened, the fifth control valve (25) is continuously opened, and the fourth control valve (24) is opened to a preset opening degree so as to throttle the refrigerant flowing to the indoor heat exchanger (40).
4. The control method according to claim 1, characterized in that the control method comprises the steps of:
s150: after the third control valve (23) is closed, the compressor (70) is turned on, and the air conditioning system enters a normal operation mode.
5. A control method of an air conditioning system, characterized in that the air conditioning system has a refrigerant compression cycle, the refrigerant compression cycle comprises a gas-liquid separator (10), a first control valve (21), a second control valve (22), a third control valve (23), an outdoor heat exchanger (30), an indoor heat exchanger (40), a first refrigerant pipe (51), a second refrigerant pipe (52), a third refrigerant pipe (53), a first sensor (61) and a second sensor (62), the outdoor heat exchanger (30) is communicated with the first control valve (21), the first control valve (21) is communicated with the second control valve (22) through the first refrigerant pipe (51), the second control valve (22) is communicated with the indoor heat exchanger (40), a first end of the third control valve (23) is communicated with the first refrigerant pipe (51) through the second refrigerant pipe (52), a second end of the third control valve (23) is communicated with the second refrigerant pipe (53) through the third refrigerant pipe (53), the first control valve (22) is used for detecting the temperature of the refrigerant in the first refrigerant pipe (61) and the second refrigerant pipe (52) in the method:
s210: the air conditioning system is opened, the first control valve (21) is closed, and the second control valve (22) is opened;
S220: opening the third control valve (23) to a preset opening degree, and throttling the refrigerant flowing from the third refrigerant pipeline (53) to the second refrigerant pipeline (52) through the third control valve (23);
s230: acquiring a refrigerant temperature T1 in the third refrigerant pipeline (53), acquiring a refrigerant temperature T2 in the second refrigerant pipeline (52), and acquiring a preset refrigerant pressure difference value T3;
S240: and calculating a differential pressure value T4 between the T1 and the T2, comparing the T3 and the T4, and selectively controlling the third control valve (23) to be closed according to the comparison result.
6. The control method according to claim 1, characterized by further comprising the step of, in said step S240:
s241: if T4 is more than T3, controlling the third control valve (23) to keep the current opening degree, and returning to the step 230; and if T4 is less than or equal to T3, controlling the third control valve (23) to be closed.
7. The control method according to claim 1, wherein the refrigerant compression cycle further includes a compressor (70), a four-way valve (80), a fourth control valve (24) and a fifth control valve (25), the fourth control valve (24) being provided on a refrigerant line between the second control valve (22) and the indoor heat exchanger (40), the indoor heat exchanger (40) further communicating with the fifth control valve (25), the fifth control valve (25) communicating with the four-way valve (80), further comprising the steps of:
After the third control valve (23) is opened, the fifth control valve (25) is continuously opened, and the fourth control valve (24) is opened to a preset opening degree so as to throttle the refrigerant flowing to the indoor heat exchanger (40).
8. The control method according to claim 1, characterized in that the control method comprises the steps of:
S250: after the third control valve (23) is closed, the compressor (70) is turned on, and the air conditioning system enters a normal operation mode.
9. A control method of an air conditioning system, characterized in that the air conditioning system has a refrigerant compression cycle, the refrigerant compression cycle comprises a gas-liquid separator (10), a first control valve (21), a second control valve (22), a third control valve (23), an outdoor heat exchanger (30), an indoor heat exchanger (40), a first refrigerant pipeline (51), a second refrigerant pipeline (52), a third refrigerant pipeline (53), a first sensor (61), a second sensor (62), a third sensor (63) and a fourth sensor, the outdoor heat exchanger (30) is communicated with the first control valve (21), the first control valve (21) is communicated with the second control valve (22) through the first refrigerant pipeline (51), the second control valve (22) is communicated with the indoor heat exchanger (40), a first end of the third control valve (23) is communicated with the first pipeline (51) through the second refrigerant pipeline (52), a third end of the third control valve (23) is communicated with the first pipeline (53) through the second refrigerant pipeline (62), the third control valve (23) is used for detecting the refrigerant pressure of the refrigerant in the first sensor (53) and the second control valve (22) is used for detecting the refrigerant pressure in the first refrigerant separator (53), the third sensor (63) is configured to detect a temperature of the refrigerant in the third refrigerant line (53), the fourth sensor (64) is configured to detect a temperature of the refrigerant in the second refrigerant line (53), and the control method includes the steps of:
S310: the air conditioning system is opened, the first control valve (21) is closed, and the second control valve (22) is opened;
S320: opening the third control valve (23) to a preset opening degree, and throttling the refrigerant flowing from the third refrigerant pipeline (53) to the second refrigerant pipeline (52) through the third control valve (23);
S330: acquiring a refrigerant pressure P1 and a refrigerant temperature T1 in the third refrigerant pipeline (53), acquiring a refrigerant pressure P2 and a refrigerant temperature T2 in the second refrigerant pipeline (52), and acquiring a preset refrigerant pressure difference value T3;
S340: calculating a pressure difference value P4 between P1 and P2, and comparing P3 and P4; calculating a differential pressure value T4 between T1 and T2, and comparing T3 and T4;
If P4 is more than P3 and T4 is more than T3, controlling the third control valve (23) to keep the current opening degree, and returning to the step 330; and if P4 is less than or equal to P3 and T4 is less than or equal to T3, the third control valve (23) is controlled to be closed.
10. An air conditioning system, characterized in that the air conditioning system is controlled by the control method according to any one of claims 1 to 9.
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| CN202211461578.8A CN118089155A (en) | 2022-11-17 | 2022-11-17 | Control method of air conditioning system and air conditioning system |
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