Air conditioner refrigerant leakage point judgment system and method

Abstract

The invention relates to the technical field of air conditioners, and provides an air conditioner refrigerant leakage point judgment system and method.The air conditioner refrigerant leakage point judgment system mainly comprises a compressor, an oil separator, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger, a sensor, a controller and other components. The refrigerant leakage point of the air conditioner can be judged according to the change of the exhaust pressure and the suction pressure detected under the power-on and power-off conditions of the four-way valve. The device can achieve the quick preliminary judgment of the refrigerant leakage point position, reduces the maintenance time, and has the characteristics of high detection efficiency, simple structure, low cost and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to an air conditioner refrigerant leak point determination system and method. Background Art

[0002] In the related art, during the operation of an air conditioner system, there is a phenomenon of refrigerant pipeline leakage, resulting in poor heat exchange effect of the air conditioner system. Therefore, it is necessary to detect the refrigerant leakage position, that is, the refrigerant leak point. However, the commonly used detection methods mainly include: (1) manually detecting the leak point after the machine stops running, and gradually detecting each refrigerant pipeline with a refrigerant detector, which is time-consuming and laborious; (2) arranging sensors in each pipeline of the air conditioner system to detect the leak point respectively, resulting in a complex system structure, cumbersome installation, and high cost. Summary of the Invention

[0003] The present invention provides an air conditioner refrigerant leak point determination system and method to solve the defects of low detection efficiency, cumbersome installation, high cost, etc. in the related art, realize the rapid preliminary determination of the refrigerant leak point position, reduce the maintenance duration, and has the characteristics of high detection efficiency, simple structure, low cost, etc.

[0004] The present invention provides an air conditioner refrigerant leak point determination system, including:

[0005] A compressor, an oil separator, a four-way valve, an indoor heat exchanger, and an outdoor heat exchanger;

[0006] The exhaust port of the compressor is connected to the inlet of the oil separator, and the oil outlet of the oil separator is connected to the suction port of the compressor through a first valve;

[0007] The first port of the four-way valve is connected to the outlet of the oil separator, the second port of the four-way valve is connected to the indoor heat exchanger, the third port of the four-way valve is connected to the outdoor heat exchanger, and the fourth port of the four-way valve is connected to the suction port of the compressor;

[0008] The indoor heat exchanger is connected to the outdoor heat exchanger through a liquid pipe. The indoor heat exchanger is provided with an indoor expansion valve, and the outdoor heat exchanger is provided with an outdoor expansion valve. The indoor expansion valve and the outdoor expansion valve are located on the liquid pipe;

[0009] A sensor for detecting the changes in the exhaust pressure and suction pressure of the compressor;

[0010] A controller, electrically connected to the first valve, the indoor expansion valve, the outdoor expansion valve, and the sensor respectively, and used for determining the air conditioner refrigerant leak point according to the changes in the exhaust pressure and suction pressure detected under the conditions of power-on and power-off of the four-way valve when executing the refrigerant leak point determination strategy.

[0011] An air conditioner refrigerant leakage point determination system provided by the present invention further includes an enthalpy-increasing air supplementing component, and the enthalpy-increasing air supplementing component includes:

[0012] An enthalpy-increasing heat exchanger connected between the indoor expansion valve and the outdoor expansion valve;

[0013] A throttle valve, the first end of the throttle valve is connected between the outdoor expansion valve and the enthalpy-increasing heat exchanger, and the second end of the throttle valve is connected to the enthalpy-increasing heat exchanger;

[0014] A second valve, which is respectively connected to the air supplementing port of the compressor and the enthalpy-increasing heat exchanger, and is electrically connected to the controller.

[0015] In an air conditioner refrigerant leakage point determination system provided by the present invention, the first valve and the second valve are electromagnetic valves.

[0016] In an air conditioner refrigerant leakage point determination system provided by the present invention, the fourth port of the four-way valve is connected to the suction port of the compressor through a gas-liquid separator.

[0017] In an air conditioner refrigerant leakage point determination system provided by the present invention, a plurality of indoor heat exchangers are arranged in parallel.

[0018] The present invention also provides a determination method for the above-mentioned air conditioner refrigerant leakage point determination system, including:

[0019] When executing the refrigerant leakage point determination strategy, detect the changes in the exhaust pressure and suction pressure of the compressor when the four-way valve is powered on and powered off;

[0020] Determine the refrigerant leakage point of the air conditioner according to the changes in the exhaust pressure and suction pressure detected when the four-way valve is powered on and powered off.

[0021] In a determination method for an air conditioner refrigerant leakage point determination system provided by the present invention, the step of determining the refrigerant leakage point of the air conditioner according to the changes in the exhaust pressure and suction pressure detected when the four-way valve is powered on and powered off includes:

[0022] When the exhaust pressure detected when the four-way valve is powered on decreases and the suction pressure remains unchanged:

[0023] If the exhaust pressure detected when the four-way valve is powered off decreases and the suction pressure remains unchanged, determine that the refrigerant leakage point of the air conditioner is the first part;

[0024] If the exhaust pressure and suction pressure detected when the four-way valve is powered off decrease, determine that the refrigerant leakage point of the air conditioner is the fourth part and the first part and / or the fifth part;

[0025] If the exhaust pressure detected when the four-way valve is powered off does not decrease and the suction pressure decreases, determine that the refrigerant leakage point of the air conditioner is the fourth part;

[0026] Wherein, the first part is the pipeline between the exhaust port of the compressor, the first port of the four-way valve, and the first valve; the fourth part is the pipeline between the second port of the four-way valve and the indoor expansion valve; the fifth part is the pipeline between the indoor expansion valve and the outdoor expansion valve.

[0027] A determination method of an air-conditioning refrigerant leakage point determination system according to the present invention further includes:

[0028] When the exhaust pressure and the suction pressure detected under the condition that the four-way valve is powered on decrease:

[0029] If the exhaust pressure detected under the condition that the four-way valve is powered off decreases and the suction pressure remains unchanged, it is determined that the air-conditioning refrigerant leakage point is the first part and the third part;

[0030] If the exhaust pressure and the suction pressure detected under the condition that the four-way valve is powered off decrease, it is determined that the air-conditioning refrigerant leakage point is the first part and the second part;

[0031] If the exhaust pressure detected under the condition that the four-way valve is powered off does not decrease and the suction pressure decreases, it is determined that the air-conditioning refrigerant leakage point is the second part and the fourth part;

[0032] Wherein, the second part is the pipeline between the fourth port of the four-way valve, the suction port of the compressor, and the first valve; the third part is the pipeline between the third port of the four-way valve and the outdoor expansion valve.

[0033] A determination method of an air-conditioning refrigerant leakage point determination system according to the present invention further includes:

[0034] When the exhaust pressure detected under the condition that the four-way valve is powered on does not decrease and the suction pressure decreases:

[0035] If the exhaust pressure detected under the condition that the four-way valve is powered off decreases and the suction pressure remains unchanged, it is determined that the air-conditioning refrigerant leakage point is the third part;

[0036] If the exhaust pressure and the suction pressure detected under the condition that the four-way valve is powered off decrease, it is determined that the air-conditioning refrigerant leakage point is the second part and the first part and / or the fifth part;

[0037] If the exhaust pressure detected under the condition that the four-way valve is powered off does not decrease and the suction pressure decreases, it is determined that the air-conditioning refrigerant leakage point is the second part.

[0038] A determination method of an air-conditioning refrigerant leakage point determination system according to the present invention further includes:

[0039] When the exhaust pressure and the suction pressure detected under the condition that the four-way valve is powered on do not decrease:

[0040] If the exhaust pressure detected under the condition that the four-way valve is powered off decreases and the suction pressure remains unchanged, it is determined that the refrigerant leakage point of the air conditioner is the fifth part;

[0041] If the exhaust pressure and the suction pressure detected under the condition that the four-way valve is powered off decrease, it is determined that the refrigerant leakage point of the air conditioner is the fifth part.

[0042] Compared with the related technology, the air conditioner refrigerant leakage point determination system and method provided by the present invention only need to set a small number of sensors, which can effectively simplify the system structure, improve the installation convenience, reduce the cost, and there is no need for manual step-by-step detection of each refrigerant pipeline with a refrigerant detector. The change of the exhaust pressure and the suction pressure of the compressor can be detected by the sensor, and the controller can determine the refrigerant leakage point of the air conditioner according to the change of the exhaust pressure and the suction pressure detected under the conditions of the four-way valve being powered on and off when executing the refrigerant leakage point determination strategy, realizing the rapid preliminary determination of the refrigerant leakage point position, reducing the maintenance duration, and having the characteristics of high detection efficiency, simple structure, and low cost. Description of the Drawings

[0043] In order to more clearly illustrate the technical solutions in the present invention or the related technology, the following will briefly introduce the drawings required for use in the embodiments or the related technology description. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0044] Figure 1 is one of the structural schematic diagrams of the air conditioner refrigerant leakage point determination system provided by the present invention;

[0045] Figure 2 is another structural schematic diagram of the air conditioner refrigerant leakage point determination system provided by the present invention;

[0046] Figure 3 is the flow schematic diagram of the determination method of the air conditioner refrigerant leakage point determination system provided by the present invention;

[0047] Figure 4 is the principle schematic diagram of the air conditioner refrigerant leakage point determination provided by the present invention.

[0048] Reference Signs:

[0049] 1: Compressor; 2: Oil Separator; 3: Four-way Valve; 4: Indoor Heat Exchanger;

[0050] 5: Outdoor Heat Exchanger; 6: First Valve; 7: Liquid Pipe; 8: Indoor Expansion Valve;

[0051] 9: Outdoor Expansion Valve; 10: First Sensor; 11: Gas-liquid Separator;

[0052] 12: Second sensor; 13: Enthalpy-increasing heat exchanger; 14: Throttle valve; 15: Second valve. Detailed implementation manners

[0053] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without making creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0054] In the description of the embodiments of the present invention, it should be noted that the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0055] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected to" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0056] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without conflict, those skilled in the art can combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0057] The following combines Figures 1 - 4 to describe the air-conditioning refrigerant leak point determination system and method of the present invention.

[0058] According to an embodiment of the first aspect of the present invention, with reference to Figure 1 and Figure 2 as shown, the air-conditioning refrigerant leak point determination system provided by the present invention mainly includes components such as a compressor 1, an oil separator 2, a four-way valve 3, an indoor heat exchanger 4, an outdoor heat exchanger 5, a sensor, and a controller.

[0059] Among them, the exhaust port of the compressor 1 is connected to the inlet of the oil separator 2, and the oil outlet of the oil separator 2 is connected to the suction port of the compressor 1 through the first valve 6. The oil separator 2 is used to separate the refrigerant and refrigerant oil mixture discharged by the compressor 1, and the first valve 6 is used to control the on-off of the oil return pipeline.

[0060] The first port of the four-way valve 3 is connected to the outlet of the oil separator 2, the second port of the four-way valve 3 is connected to the indoor heat exchanger 4, the third port of the four-way valve 3 is connected to the outdoor heat exchanger 5, and the fourth port of the four-way valve 3 is connected to the suction port of the compressor 1. The four-way valve 3 is used to switch the system between the heating mode and the cooling mode. When the four-way valve 3 is powered on, the first port and the second port of the four-way valve 3 are conducted, and the third port and the fourth port are conducted, and the system switches to the heating mode; when the four-way valve 3 is powered off, the first port and the third port of the four-way valve 3 are conducted, and the second port and the fourth port are conducted, and the system switches to the cooling mode.

[0061] The indoor heat exchanger 4 is connected to the outdoor heat exchanger 5 through the liquid pipe 7. The indoor heat exchanger 4 is provided with an indoor expansion valve 8, and the outdoor heat exchanger 5 is provided with an outdoor expansion valve 9. The indoor expansion valve 8 and the outdoor expansion valve 9 are located in the liquid pipe 7 and are mainly used for throttling.

[0062] The sensor is mainly used to detect the changes in the exhaust pressure and suction pressure of the compressor 1 when the system executes the refrigerant leak point determination strategy; the specific installation position of the sensor in the present invention is not particularly limited. For example, a first sensor 10 can be installed between the exhaust port of the compressor 1 and the inlet of the oil separator 2 to detect the change in the exhaust pressure of the compressor 1, and a second sensor 12 can be installed between the fourth port of the four-way valve 3 and the inlet of the following gas-liquid separator 11 to detect the change in the suction pressure of the compressor 1.

[0063] The controller is electrically connected to the first valve 6, the indoor expansion valve 8, the outdoor expansion valve 9 and the sensor respectively. When executing the refrigerant leak point determination strategy, the controller controls the first valve 6, the indoor expansion valve 8 and the outdoor expansion valve 9 to close, so as to fix the volume of each part of the pipeline of the system, which is convenient for pressure detection, and can determine the refrigerant leak point of the air conditioner according to the changes in the exhaust pressure and suction pressure detected when the four-way valve 3 is powered on and off.

[0064] Specifically, when the system is powered on for heating and powered off for cooling and operates normally, the first valve 6, the indoor expansion valve 8, the outdoor expansion valve 9 and the following second valve 15 are all fully open. During the operation, if the system issues a warning of insufficient refrigerant, the refrigerant leak point determination strategy can be automatically or manually executed at this time, which specifically includes:

[0065] 1. When the four-way valve 3 is powered on and operating, the first valve 6, the indoor expansion valve 8, the outdoor expansion valve 9, and the following second valve 15 are all closed. Then, the difference between the initial value of the exhaust pressure pd of the compressor 1 and the pressure after a preset time period, and the difference between the initial value of the suction pressure ps and the pressure after a preset time period are detected. The changes in pd and ps are determined by the pressure differences. Generally speaking, when the refrigerant leaks, the pressure drops. Among them, the preset time period can be, for example, 2h. If the time period is too short, less refrigerant leaks and the pressure difference cannot be accurately detected. If the time period is too long, the operating conditions change greatly and it is impossible to determine whether the pressure change is caused by the refrigerant or the temperature.

[0066] 2. When the four-way valve 3 is powered off and operating, the first valve 6, the indoor expansion valve 8, the outdoor expansion valve 9, and the following second valve 15 are all closed. Again, the difference between the initial value of the exhaust pressure pd of the compressor 1 and the pressure after a preset time period, and the difference between the initial value of the suction pressure ps and the pressure after a preset time period are detected. The changes in pd and ps are determined by the pressure differences.

[0067] 3. Determine the refrigerant leakage point: Based on whether the pd and ps detected by the system drop during the power-on and power-off of the four-way valve 3, the refrigerant leakage point is judged. The specific judgment process can be referred to Figure 4 as shown, and will not be elaborated here.

[0068] In Figure 4 , "not moving" means that the pressure differences detected at the front and rear moments are within the set value range, and it can be considered that the pressure remains basically unchanged; "Ⅰ and / or Ⅴ" means that only one of the two parts may leak, or both parts may leak; "unknown" means that it is impossible to judge this part of the pipeline, and there may be a leakage point. The operator can make further detections according to the actual operating conditions; a single slash indicates that this kind of pressure change situation will not occur in the system.

[0069] The entire air-conditioning system mainly includes five pipeline parts where the refrigerant is prone to leakage, namely the first part Ⅰ, the second part Ⅱ, the third part Ⅲ, the fourth part Ⅳ, and the fifth part Ⅴ.

[0070] As Figure 2 shown, the first part Ⅰ is the pipeline between the exhaust port of the compressor 1, the first port of the four-way valve 3, and the first valve 6; the second part Ⅱ is the pipeline between the fourth port of the four-way valve 3, the suction port of the compressor 1, and the first valve 6; the third part Ⅲ is the pipeline between the third port of the four-way valve 3 and the outdoor expansion valve 9; the fourth part Ⅳ is the pipeline between the second port of the four-way valve 3 and the indoor expansion valve 8; the fifth part Ⅴ is the pipeline between the indoor expansion valve 8, the outdoor expansion valve 3, and the second valve 15.

[0071] Therefore, compared with the related art, the air conditioner refrigerant leak point determination system provided by the embodiments of the present invention only needs to set a small number of sensors, which can effectively simplify the system structure, improve the installation convenience, reduce the cost, and there is no need for manual use of a refrigerant detector to gradually detect each refrigerant pipeline. By the sensors, the changes in the exhaust pressure and suction pressure of the compressor can be detected. When the refrigerant leak point determination strategy is executed by the controller, according to the changes in the exhaust pressure and suction pressure detected in the case of the four-way valve 3 being powered on and powered off, the refrigerant leak point of the air conditioner can be determined, realizing a rapid preliminary determination of the refrigerant leak point position, reducing the maintenance duration, and having the characteristics of high detection efficiency, simple structure, and low cost.

[0072] According to an embodiment of the present invention, referring to Figure 1 and Figure 2 as shown, the air conditioner refrigerant leak point determination system of the present invention further includes an enthalpy-increasing air supplementing component, and the enthalpy-increasing air supplementing component includes: an enthalpy-increasing heat exchanger 13, a throttle valve 14, and a second valve 15.

[0073] Among them, the enthalpy-increasing heat exchanger 13 can be a plate heat exchanger, and the enthalpy-increasing heat exchanger 13 is connected between the indoor expansion valve 8 and the outdoor expansion valve 9; the first end of the throttle valve 14 is connected between the outdoor expansion valve 9 and the enthalpy-increasing heat exchanger 13, and the second end of the throttle valve 14 is connected to the enthalpy-increasing heat exchanger 13; the second valve 15 is respectively connected to the air supplementing port of the compressor 1 and the enthalpy-increasing heat exchanger 13, and is electrically connected to the controller for controlling the on-off of the corresponding pipeline.

[0074] Specifically, when the system operates normally for refrigeration, the high-temperature gaseous refrigerant and refrigerant oil mixture of the compressor 1 are sent to the oil separator 2 for separation. The separated refrigerant oil returns to the compressor 1 through the first valve 6, and the separated high-temperature gaseous refrigerant flows through the outdoor heat exchanger 5 through the first port and the third port of the four-way valve 3 to condense and release heat. The liquefied refrigerant after heat release is throttled by the outdoor expansion valve 9 again. The throttled liquefied refrigerant is divided into two paths. The first path flows through the enthalpy-increasing heat exchanger 13, and the second path is throttled by the throttle valve 14 to be cooled into a low-temperature liquefied refrigerant and enters the enthalpy-increasing heat exchanger 13 to absorb the heat of the relatively high-temperature liquefied refrigerant in the first path and evaporate into a gaseous refrigerant, and then flows to the compressor 1 through the second valve 15 for enthalpy-increasing air supplement; at the same time, the liquefied refrigerant in the first path is cooled, and then throttled by the indoor expansion valve 8 and flows into the indoor heat exchanger 4 to evaporate and absorb heat, and then flows through the second port and the fourth port of the four-way valve 3 into the gas-liquid separator 11 for separation, and the separated gaseous refrigerant flows back to the compressor 1.

[0075] Similarly, when the system is operating normally for heating, the high-temperature gaseous refrigerant and refrigerant oil mixture of the compressor 1 are sent to the oil separator 2 for separation. The separated refrigerant oil returns to the compressor 1 through the first valve 6, and the separated high-temperature gaseous refrigerant flows through the indoor heat exchanger 4 through the first port and the second port of the four-way valve 3 to condense and release heat. The released liquid refrigerant is then throttled by the indoor expansion valve 8. The throttled liquid refrigerant flows out through the enthalpy-increasing heat exchanger 13, and then divides into two paths. The first path flows into the outdoor expansion valve 9, and the second path is throttled by the throttle valve 14 to become a low-temperature liquid refrigerant and then enters the enthalpy-increasing heat exchanger 13 to absorb the heat of the relatively higher-temperature liquid refrigerant entering the enthalpy-increasing heat exchanger 13 and evaporates into a gaseous refrigerant, and then flows to the compressor 1 through the second valve 15 for enthalpy-increasing gas replenishment; at the same time, the liquid refrigerant entering the enthalpy-increasing heat exchanger 13 is cooled, and then throttled by the outdoor expansion valve 9 and flows into the outdoor heat exchanger 5 to evaporate and absorb heat, and then flows into the gas-liquid separator 11 through the third port and the fourth port of the four-way valve 3 for separation. The separated gaseous refrigerant returns to the compressor 1.

[0076] Therefore, in the embodiment of the present invention, by setting the enthalpy-increasing gas replenishment component, on the one hand, the subcooling degree of the refrigerant can be increased, the refrigeration and heating effects can be improved, and the refrigerant can be subcooled to ensure that there is no gaseous refrigerant in the liquid pipe 7, thereby avoiding the noise phenomenon caused by the presence of gaseous refrigerant in the liquid pipe 7. On the other hand, it can replenish gas to the compressor 1 with enthalpy increase, increase the refrigerant circulation amount of the compressor 1, and thus improve the refrigeration and heating capacity of the system.

[0077] According to an embodiment of the present invention, the first valve 6 and the second valve 15 are solenoid valves for easy control.

[0078] According to an embodiment of the present invention, referring to Figure 1 and Figure 2 as shown, the fourth port of the four-way valve 3 is connected to the suction port of the compressor 1 through the gas-liquid separator 11. The gas-liquid separator 11 is used for gas-liquid separation of the refrigerant to prevent too much liquid refrigerant from entering the compressor 1, thereby avoiding the liquid hammer phenomenon and achieving the purpose of protecting the compressor 1.

[0079] According to an embodiment of the present invention, referring to Figure 1 and Figure 2 as shown, a plurality of indoor heat exchangers 4 are arranged in parallel, which can effectively improve the indoor heat exchange effect.

[0080] Next, the determination method of the air-conditioning refrigerant leak point determination system provided by the present invention will be described. The determination method of the air-conditioning refrigerant leak point determination system described below can be mutually referred to with the air-conditioning refrigerant leak point determination system described above.

[0081] According to an embodiment of the second aspect of the present invention, referring to Figure 3 as shown, the present invention also provides a determination method for the air-conditioning refrigerant leak point determination system of the above embodiment, which mainly includes the following steps:

[0082] When performing the refrigerant leak point determination strategy, detect the changes in the exhaust pressure and suction pressure of the compressor 1 when the four-way valve 3 is powered on and powered off.

[0083]

[0082] Specifically, when the system performs the refrigerant leak point determination strategy, at this time, when the four-way valve 3 is powered on, the first valve 6, the indoor expansion valve 8, the outdoor expansion valve 9, and the second valve 15 are all closed, and the changes in the exhaust pressure and suction pressure of the compressor 1 are detected; then, when the four-way valve 3 is powered off, the first valve 6, the indoor expansion valve 8, the outdoor expansion valve 9, and the second valve 15 are all closed, and the changes in the exhaust pressure and suction pressure of the compressor 1 are detected again.

[0084] Among them, the step of detecting the changes in the exhaust pressure and suction pressure of the compressor 1 when the four-way valve 3 is powered on includes: when the four-way valve 3 is powered on, detect the exhaust pressure and suction pressure of the compressor 1 as the first exhaust pressure and the first suction pressure, wait for the first preset duration, and then detect the exhaust pressure and suction pressure of the compressor 1 as the second exhaust pressure and the second suction pressure, and determine the change in the exhaust pressure of the compressor 1 according to the pressure difference between the first exhaust pressure and the second exhaust pressure, and determine the change in the suction pressure of the compressor 1 according to the pressure difference between the first suction pressure and the second suction pressure.

[0085]

[0083] Similarly, the step of detecting the changes in the exhaust pressure and suction pressure of the compressor 1 when the four-way valve 3 is powered off includes: when the four-way valve 3 is powered off, detect the exhaust pressure and suction pressure of the compressor 1 as the third exhaust pressure and the third suction pressure, wait for the second preset duration, and then detect the exhaust pressure and suction pressure of the compressor 1 as the fourth exhaust pressure and the fourth suction pressure, and determine the change in the exhaust pressure of the compressor 1 according to the pressure difference between the third exhaust pressure and the fourth exhaust pressure, and determine the change in the suction pressure of the compressor 1 according to the pressure difference between the third suction pressure and the fourth suction pressure.

[0086] S200. Determine the refrigerant leak point of the air conditioner according to the changes in the exhaust pressure and suction pressure detected when the four-way valve 3 is powered on and powered off.

[0087]

[0084] Therefore, the determination method of the air conditioner refrigerant leak point determination system provided by the embodiment of the present invention can quickly and preliminarily determine the position of the refrigerant leak point by detecting the changes in the exhaust pressure and suction pressure of the compressor 1 when the four-way valve 3 is powered on and powered off, improve the detection efficiency, and reduce the maintenance duration.

[0088] According to an embodiment of the present invention, refer to Figure 4 As shown, the step of determining the refrigerant leak point of the air conditioner according to the changes in the exhaust pressure and suction pressure detected when the four-way valve 3 is powered on and powered off includes:

[0089] When the exhaust pressure detected under the condition that the four-way valve 3 is powered on drops and the suction pressure remains unchanged:

[0090] If the exhaust pressure detected under the condition that the four-way valve 3 is powered off drops and the suction pressure remains unchanged, it is determined that the refrigerant leakage point of the air conditioner is the first part Ⅰ;

[0091] If the exhaust pressure and the suction pressure detected under the condition that the four-way valve 3 is powered off drop, it is determined that the refrigerant leakage point of the air conditioner is the fourth part and the first part Ⅰ and / or the fifth part Ⅴ;

[0092] If the exhaust pressure detected under the condition that the four-way valve 3 is powered off does not drop and the suction pressure drops, it is determined that the refrigerant leakage point of the air conditioner is the fourth part Ⅳ;

[0093] Wherein, the first part Ⅰ is the pipeline between the exhaust port of the compressor 1 and the first port of the four-way valve 3 and the first valve 6; the fourth part Ⅳ is the pipeline between the second port of the four-way valve 3 and the indoor expansion valve 8; the fifth part Ⅴ is the pipeline between the indoor expansion valve 8 and the outdoor expansion valve 9 and the second valve 15.

[0094] According to an embodiment of the present invention, referring to Figure 4 As shown, the steps of determining the refrigerant leakage point of the air conditioner according to the changes in the exhaust pressure and the suction pressure detected under the powered-on and powered-off conditions of the four-way valve 3 further include:

[0095] When the exhaust pressure and the suction pressure detected under the condition that the four-way valve 3 is powered on drop:

[0096] If the exhaust pressure detected under the condition that the four-way valve 3 is powered off drops and the suction pressure remains unchanged, it is determined that the refrigerant leakage point of the air conditioner is the first part Ⅰ and the third part Ⅲ; and the fifth part Ⅴ is unknown, and it is impossible to judge the pipeline of this part, and there may be a leakage point, and the operator can conduct further detection according to the actual working conditions;

[0097] If the exhaust pressure and the suction pressure detected under the condition that the four-way valve 3 is powered off drop, it is determined that the refrigerant leakage point of the air conditioner is the first part Ⅰ and the second part Ⅱ;

[0098] If the exhaust pressure detected under the condition that the four-way valve 3 is powered off does not drop and the suction pressure drops, it is determined that the refrigerant leakage point of the air conditioner is the second part Ⅱ and the fourth part Ⅳ;

[0099] Wherein, the second part Ⅱ is the pipeline between the fourth port of the four-way valve 3 and the suction port of the compressor 1 and the first valve 6; the third part Ⅲ is the pipeline between the third port of the four-way valve 3 and the outdoor expansion valve 9.

[0100] According to an embodiment of the present invention, referring to Figure 4As shown, the steps for determining the refrigerant leakage point of the air conditioner according to the changes in the exhaust pressure and suction pressure detected under the power-on and power-off conditions of the four-way valve 3 further include:

[0101] When the exhaust pressure detected under the power-on condition of the four-way valve 3 does not decrease and the suction pressure decreases:

[0102] If the exhaust pressure detected under the power-off condition of the four-way valve 3 decreases and the suction pressure remains unchanged, determine that the refrigerant leakage point of the air conditioner is the third part Ⅲ;

[0103] If the exhaust pressure and suction pressure detected under the power-off condition of the four-way valve 3 decrease, determine that the refrigerant leakage point of the air conditioner is the second part and the first part Ⅰ and / or the fifth part Ⅴ;

[0104] If the exhaust pressure detected under the power-off condition of the four-way valve 3 does not decrease and the suction pressure decreases, determine that the refrigerant leakage point of the air conditioner is the second part Ⅱ.

[0105] According to an embodiment of the present invention, with reference to Figure 4 As shown, the steps for determining the refrigerant leakage point of the air conditioner according to the changes in the exhaust pressure and suction pressure detected under the power-on and power-off conditions of the four-way valve 3 further include:

[0106] When the exhaust pressure and suction pressure detected under the power-on condition of the four-way valve 3 do not decrease:

[0107] If the exhaust pressure detected under the power-off condition of the four-way valve 3 decreases and the suction pressure remains unchanged, determine that the refrigerant leakage point of the air conditioner is the fifth part Ⅴ;

[0108] If the exhaust pressure and suction pressure detected under the power-off condition of the four-way valve 3 decrease, determine that the refrigerant leakage point of the air conditioner is the fifth part Ⅴ.

[0109] Therefore, the determination method of the refrigerant leakage point determination system provided by the embodiment of the present invention can realize the rapid preliminary determination of the refrigerant leakage point position, improve the detection efficiency, and reduce the maintenance duration.

[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air conditioner refrigerant leak point determination system, characterized in that, it includes: a compressor, an oil separator, a four-way valve, an indoor heat exchanger and an outdoor heat exchanger; the exhaust port of the compressor is connected to the inlet of the oil separator, and the oil outlet of the oil separator is connected to the suction port of the compressor through a first valve; the first port of the four-way valve is connected to the outlet of the oil separator, the second port of the four-way valve is connected to the indoor heat exchanger, the third port of the four-way valve is connected to the outdoor heat exchanger, and the fourth port of the four-way valve is connected to the suction port of the compressor; the indoor heat exchanger is connected to the outdoor heat exchanger through a liquid pipe, the indoor heat exchanger is provided with an indoor expansion valve, the outdoor heat exchanger is provided with an outdoor expansion valve, and the indoor expansion valve and the outdoor expansion valve are located on the liquid pipe; a sensor for detecting changes in the exhaust pressure and suction pressure of the compressor; a controller electrically connected to the first valve, the indoor expansion valve, the outdoor expansion valve and the sensor respectively, and used for determining the refrigerant leak point of the air conditioner according to the changes in the exhaust pressure and suction pressure detected in the case of the four-way valve being powered on and powered off when executing the refrigerant leak point determination strategy.

2. The air conditioner refrigerant leak point determination system according to claim 1, characterized in that, it further includes an enthalpy-increasing air supplementing component, and the enthalpy-increasing air supplementing component includes: an enthalpy-increasing heat exchanger connected between the indoor expansion valve and the outdoor expansion valve; a throttle valve, the first end of the throttle valve is connected between the outdoor expansion valve and the enthalpy-increasing heat exchanger, and the second end of the throttle valve is connected to the enthalpy-increasing heat exchanger; a second valve respectively connected to the air supplementing port of the compressor and the enthalpy-increasing heat exchanger, and electrically connected to the controller.

3. The air conditioner refrigerant leak point determination system according to claim 2, characterized in that, the first valve and the second valve are solenoid valves.

4. The air conditioner refrigerant leak point determination system according to claim 1, characterized in that, the fourth port of the four-way valve is connected to the suction port of the compressor through a gas-liquid separator.

5. The air conditioner refrigerant leak point determination system according to any one of claims 1-4, characterized in that, a plurality of indoor heat exchangers are arranged in parallel.

6. A determination method for the air conditioner refrigerant leak point determination system according to any one of claims 1-5, characterized in that, it includes: when executing the refrigerant leak point determination strategy, detecting the changes in the exhaust pressure and suction pressure of the compressor in the case of the four-way valve being powered on and powered off; determining the refrigerant leak point of the air conditioner according to the changes in the exhaust pressure and suction pressure detected in the case of the four-way valve being powered on and powered off.

7. The determination method for the air conditioner refrigerant leak point determination system according to claim 6, characterized in that, the step of determining the refrigerant leak point of the air conditioner according to the changes in the exhaust pressure and suction pressure detected in the case of the four-way valve being powered on and powered off includes: when the exhaust pressure detected in the case of the four-way valve being powered on decreases and the suction pressure remains unchanged: if the exhaust pressure detected in the case of the four-way valve being powered off decreases and the suction pressure remains unchanged, it is determined that the refrigerant leak point of the air conditioner is the first part; If the exhaust pressure and the suction pressure detected under the condition that the four-way valve is powered off decrease, determine that the refrigerant leakage point of the air conditioner is the fourth part and the first part and / or the fifth part; If the exhaust pressure detected under the condition that the four-way valve is powered off does not decrease and the suction pressure decreases, determine that the refrigerant leakage point of the air conditioner is the fourth part; Wherein, the first part is the pipeline between the exhaust port of the compressor and the first port of the four-way valve and the first valve; the fourth part is the pipeline between the second port of the four-way valve and the indoor expansion valve; the fifth part is the pipeline between the indoor expansion valve and the outdoor expansion valve.

8. The determination method of the refrigerant leakage point determination system of the air conditioner according to claim 7, characterized in that, further comprising: When the exhaust pressure and the suction pressure detected under the condition that the four-way valve is powered on decrease: If the exhaust pressure detected under the condition that the four-way valve is powered off decreases and the suction pressure remains unchanged, determine that the refrigerant leakage point of the air conditioner is the first part and the third part; If the exhaust pressure and the suction pressure detected under the condition that the four-way valve is powered off decrease, determine that the refrigerant leakage point of the air conditioner is the first part and the second part; If the exhaust pressure detected under the condition that the four-way valve is powered off does not decrease and the suction pressure decreases, determine that the refrigerant leakage point of the air conditioner is the second part and the fourth part; Wherein, the second part is the pipeline between the fourth port of the four-way valve and the suction port of the compressor and the first valve; The third part is the pipeline between the third port of the four-way valve and the outdoor expansion valve.

9. The determination method of the refrigerant leakage point determination system of the air conditioner according to claim 8, characterized in that, further comprising: When the exhaust pressure detected under the condition that the four-way valve is powered on does not decrease and the suction pressure decreases: If the exhaust pressure detected under the condition that the four-way valve is powered off decreases and the suction pressure remains unchanged, determine that the refrigerant leakage point of the air conditioner is the third part; If the exhaust pressure and the suction pressure detected under the condition that the four-way valve is powered off decrease, determine that the refrigerant leakage point of the air conditioner is the second part and the first part and / or the fifth part; If the exhaust pressure detected under the condition that the four-way valve is powered off does not decrease and the suction pressure decreases, determine that the refrigerant leakage point of the air conditioner is the second part.

10. The determination method of the refrigerant leakage point determination system of the air conditioner according to claim 7, characterized in that, further comprising: When the exhaust pressure and the suction pressure detected under the condition that the four-way valve is powered on do not decrease: If the exhaust pressure detected under the condition that the four-way valve is powered off decreases and the suction pressure remains unchanged, determine that the refrigerant leakage point of the air conditioner is the fifth part; If the exhaust pressure and the suction pressure detected under the condition that the four-way valve is powered off decrease, determine that the refrigerant leakage point of the air conditioner is the fifth part.

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