Refrigerant recovery method and device for refrigerating and heating equipment, storage medium and electronic equipment

Abstract

The invention relates to a refrigerant recovery method and device for refrigerating and heating equipment, a storage medium and electronic equipment. The method comprises the steps that in the process that a target machine in an indoor unit and an outdoor unit of the refrigerating and heating equipment is in a refrigerating state, when it is detected that refrigerant of the target machine leaks, a liquid pipe valve of the target machine is closed; and after the compressor of the target machine continues to run for a preset duration, an air pipe valve of the target machine is closed so as to recover the refrigerant. The technical problem of refrigerant loss caused by refrigerant leakage is solved.

Description

Technical Field

[0001] The present application relates to the field of refrigerant recovery of refrigeration and heating equipment, and in particular to a refrigerant recovery method, device, storage medium and electronic equipment for refrigeration and heating equipment. Background Art

[0002] In the prior art, during the cooling or heating process of a cooling or heating device, one of the indoor unit and the outdoor unit of the cooling or heating device is responsible for cooling, while the other is responsible for heating, thereby meeting the cooling or heating requirements of the indoor unit. However, during the cooling process of the indoor unit or the outdoor unit of the cooling or heating device, refrigerant leakage may occur. If the refrigerant leaks, the refrigerant is lost. Summary of the invention

[0003] The present application provides a refrigerant recovery method, device, storage medium and electronic device for refrigeration and heating equipment to solve the technical problem of refrigerant loss caused by refrigerant leakage.

[0004] In a first aspect, the present application provides a refrigerant recovery method for refrigeration and heating equipment, comprising: when a target machine among the indoor unit and outdoor unit of the refrigeration and heating equipment is in a refrigeration state, when a refrigerant leakage of the target machine is detected, closing the liquid pipe valve of the target machine; after the compressor of the target machine continues to run for a predetermined period of time, closing the gas pipe valve of the target machine to recover the refrigerant.

[0005] In the second aspect, the present application provides a refrigerant recovery device for refrigeration and heating equipment, including: a first processing module, used to close the liquid pipe valve of the target machine when a refrigerant leakage of the target machine is detected during the process in which the target machine in the indoor unit and the outdoor unit of the refrigeration and heating equipment is in a refrigeration state; a second processing module, used to close the gas pipe valve of the target machine to recover the refrigerant after the compressor of the target machine continues to run for a predetermined period of time.

[0006] As an optional example, the first processing module includes: a first detection unit, for determining that the refrigerant of the target machine is leaking when it is detected that the opening of the electronic expansion valve of the target machine increases or the rate of increase of the opening of the electronic expansion valve increases when the operating wind speed of the target machine remains unchanged and the difference between the inlet temperature and the outlet temperature of the target machine remains unchanged.

[0007] As an optional example, the first processing module includes: a second detection unit, which is used to determine that the refrigerant of the target machine is leaking when it is detected that the opening of the electronic expansion valve of the target machine increases or the rate of increase of the opening of the electronic expansion valve increases when the operating wind speed of the target machine changes, if the operating wind speed decreases and the difference between the inlet temperature and the outlet temperature of the target machine remains unchanged.

[0008] As an optional example, the first processing module includes: a third detection unit, for determining that the refrigerant of the target machine is leaking when it is detected that the opening of the electronic expansion valve of the target machine increases or the rate at which the opening of the electronic expansion valve increases, if the difference between the inlet temperature and the outlet temperature of the target machine decreases when the operating wind speed of the target machine remains unchanged.

[0009] As an optional example, the above-mentioned device also includes: a determination module, which is used to determine the change in the opening degree of the electronic expansion valve after closing the liquid pipe valve of the above-mentioned target machine when refrigerant leakage of the above-mentioned target machine is detected; and determine the above-mentioned predetermined time period based on the above-mentioned change.

[0010] As an optional example, the determination module includes: a setting unit, configured to set the predetermined time length so that the greater the change in the opening degree of the electronic expansion valve, the longer the predetermined time length.

[0011] As an optional example, the above-mentioned device also includes: a control module, which is used to control the above-mentioned target machine to shut down after closing the gas pipe valve of the above-mentioned target machine to recover the above-mentioned refrigerant.

[0012] In a third aspect, the present application provides an electronic device comprising: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor connected to the at least one bus; and at least one memory connected to the at least one bus, wherein the memory stores a computer program, and the processor is configured to implement any one of the above-mentioned refrigerant recovery methods for refrigeration and heating equipment when executing the computer program.

[0013] In a fourth aspect, the present application further provides a computer storage medium storing computer executable instructions, wherein the computer executable instructions are used to execute the refrigerant recovery method of any of the above-mentioned refrigeration and heating equipment of the present application.

[0014] The above-mentioned technical scheme provided by the embodiment of the present application has the following advantages over the prior art: the scheme provided by the embodiment of the present application, by closing the liquid pipe valve of the above-mentioned target machine when a refrigerant leakage is detected in the target machine in the indoor unit and the outdoor unit of the above-mentioned refrigeration and heating equipment during the process of the target machine in the refrigeration state; after the compressor of the above-mentioned target machine continues to run for a predetermined period of time, closing the gas pipe valve of the above-mentioned target machine to recover the above-mentioned refrigerant, so that when the indoor unit or the outdoor unit of the refrigeration and heating equipment is refrigerating, if refrigerant leakage occurs, part of the refrigerant can be recovered, thereby reducing the refrigerant loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0017] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0018] Figure 1 A flow chart of a refrigerant recovery method for a refrigeration and heating device provided in an embodiment of the present application;

[0019] Figure 2 A schematic diagram of a device for a refrigerant recovery method for a refrigeration and heating device provided in an embodiment of the present application;

[0020] Figure 3 A flow chart of another refrigerant recovery method for refrigeration and heating equipment provided in an embodiment of the present application;

[0021] Figure 4 A schematic diagram of the structure of a refrigerant recovery device for a refrigeration and heating device provided in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0024] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0025] In order to solve the technical problem of refrigerant loss caused by refrigerant leakage in the prior art, the present application provides a refrigerant recovery method for refrigeration and heating equipment, which can achieve the effect of reducing refrigerant loss when refrigerant leakage occurs.

[0026] Figure 1 This is a flow chart of a refrigerant recovery method for a refrigeration and heating device provided in an embodiment of the present application. Figure 1 As shown, the refrigerant recovery method of the above-mentioned refrigeration and heating equipment includes:

[0027] S102, when a target machine among the indoor unit and the outdoor unit of the cooling and heating equipment is in a cooling state, when a refrigerant leakage of the target machine is detected, closing a liquid pipe valve of the target machine;

[0028] S104, after the compressor of the target machine continues to run for a predetermined period of time, closing the gas pipe valve of the target machine to recover the refrigerant.

[0029] Optionally, the cooling and heating equipment may be composed of an indoor unit and an outdoor unit, the indoor unit may cool or heat, when the indoor unit cools, the outdoor unit heats, when the indoor unit heats, the outdoor unit cools. The machine in the cooling state among the indoor unit and the outdoor unit is called the target machine, that is, the target machine is not fixed.

[0030] Take indoor cooling as the target machine as an example. Figure 2As shown. In this embodiment, the indoor unit at least includes a heat exchanger, a fan, an electronic expansion valve, an inlet pipe temperature sensor, an outlet pipe temperature sensor, etc. During refrigeration operation, the refrigerant enters from the liquid pipe, enters the heat exchanger for evaporation and heat exchange after being throttled by the electronic expansion valve, and then returns to the suction end of the compressor through the gas pipe. When the wind gear is stable during refrigeration operation, the opening of the electronic expansion valve is controlled according to the difference between the inlet pipe temperature and the outlet pipe temperature of the indoor unit; when the indoor unit is in refrigeration operation, the difference between the inlet pipe temperature and the outlet pipe temperature of the indoor unit is controlled to remain unchanged. When the amount of refrigerant in the system is fixed and no leakage occurs, under the same heat exchange conditions, the opening of the electronic expansion valve is certain; but when the amount of refrigerant in the system leaks, under the same heat exchange conditions, the difference between the inlet pipe temperature and the outlet pipe temperature of the indoor unit is controlled to remain unchanged. Due to the reduction of refrigerant, the opening of the electronic expansion valve will gradually increase.

[0031] When the target machine is in the cooling state, the refrigerant in the target machine passes through the liquid pipe and then the electronic expansion valve into the heat exchanger, and then is recovered through the gas pipe. During the cooling process, it is necessary to detect whether the refrigerant has leaked. If the refrigerant is found to be leaking, the liquid pipe valve can be closed first, and the compressor continues to run. At this time, the compressor will recover part of the condensing agent in the pipeline through the gas pipe. If the environment where the condensing agent is leaked is still a sealed environment, it can be almost completely recovered through the gas pipe. If the environment where the condensing agent is leaked is not sealed, most of the condensing agent still in the pipeline can be recovered.

[0032] After the compressor has run for a predetermined period of time, the refrigerant can be considered to have been recovered and the air pipe valve can be closed.

[0033] In this embodiment, the above-mentioned predetermined time length can be set manually. The volume in the pipeline can be calculated according to the thickness and length of the pipeline, and the predetermined time length can be determined according to the volume size. The larger the volume, the longer the predetermined time length.

[0034] The solution provided by the embodiment of the present application is to close the liquid pipe valve of the target machine when a refrigerant leakage is detected in the target machine in the indoor unit and the outdoor unit of the above-mentioned cooling and heating equipment during the process of the target machine in the cooling state; and close the gas pipe valve of the above-mentioned target machine after the compressor of the above-mentioned target machine continues to run for a predetermined period of time to recover the refrigerant. Therefore, when the indoor unit or the outdoor unit of the cooling and heating equipment is cooling, if refrigerant leakage occurs, part of the refrigerant can be recovered, thereby reducing the refrigerant loss.

[0035] As an optional example, detecting whether the refrigerant of the target machine is leaking includes: when the operating wind speed of the target machine remains unchanged and the difference between the inlet temperature and the outlet temperature of the target machine remains unchanged, when it is detected that the opening of the electronic expansion valve of the target machine increases or the rate of increase of the opening of the electronic expansion valve increases, it is determined that the refrigerant of the target machine is leaking.

[0036] In the present application, whether the condensing agent has leaked can be determined by the change in the opening of the electronic expansion valve. The opening of the electronic expansion valve will change with the flow rate of the refrigerant per unit time. The larger the flow rate, the larger the opening of the electronic expansion valve. If the operating windshield of the target machine remains unchanged, and the difference between the inlet temperature and the outlet temperature of the target machine remains unchanged, it means that the refrigeration effect of the refrigerant is basically stable. At this time, the flow rate of the refrigerant should not change significantly, and thus the opening of the electronic expansion valve will not change significantly. In this case, if the opening of the electronic expansion valve increases or the rate at which the opening of the above-mentioned electronic expansion valve increases, it means that the flow rate of the refrigerant is larger, that is, more refrigerant produces the same refrigeration effect. Therefore, it can be determined that the refrigerant has leaked.

[0037] In this embodiment, the increase in the opening of the electronic expansion valve can be monitored, and it can be considered that the refrigerant has leaked when it increases to a certain degree, or it can be considered that the refrigerant has leaked when the rate of increase exceeds a certain value.

[0038] As an optional example, detecting whether the refrigerant of the target machine is leaking includes: when the operating wind speed of the target machine changes, if the operating wind speed decreases and the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine remains unchanged, then when it is detected that the opening of the electronic expansion valve of the target machine increases or the rate of increase of the opening of the electronic expansion valve increases, it is determined that the refrigerant of the target machine is leaking.

[0039] In the present application, whether the condensing agent has leaked can be determined by the change in the opening of the electronic expansion valve. The opening of the electronic expansion valve will change with the flow rate of the refrigerant per unit time. The larger the flow rate, the larger the opening of the electronic expansion valve. When the target machine is cooling, if the operating wind speed is reduced, and the difference between the inlet temperature and the outlet temperature of the above-mentioned target machine remains unchanged, then the theoretically required flow rate of the refrigerant is reduced, and the opening of the electronic expansion valve should be reduced. If the opening of the electronic expansion valve does not decrease, but still increases, or the rate of increase in the opening increases, it is considered that the refrigerant is leaking.

[0040] As an optional example, detecting whether the refrigerant of the target machine is leaking includes: when the operating wind speed of the target machine remains unchanged, if the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine becomes smaller, then when it is detected that the opening of the electronic expansion valve of the target machine increases or the rate of increase of the opening of the electronic expansion valve increases, it is determined that the refrigerant of the target machine is leaking.

[0041] In the present application, whether the condensing agent has leaked can be determined by the change in the opening of the electronic expansion valve. The opening of the electronic expansion valve will change with the flow rate of the refrigerant per unit time. The larger the flow rate, the larger the opening of the electronic expansion valve. When the operating windshield of the target machine remains unchanged, if the difference between the inlet temperature and the outlet temperature of the above-mentioned target machine becomes smaller, then the theoretically required flow rate of the refrigerant decreases, and the opening of the electronic expansion valve should be reduced. If the opening of the electronic expansion valve does not decrease, but still increases, or the rate of increase in the opening increases, it is considered that the refrigerant is leaking.

[0042] The above is a case where the electronic expansion valve opening is used to determine whether the refrigerant is leaking. In another example, the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine can also be used to determine whether the condenser is leaking. If the opening of the electronic expansion valve remains unchanged and the operating wind speed remains unchanged, if the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine decreases, or the rate at which the difference decreases increases, it is considered that the refrigerant is leaking.

[0043] As an optional example, when the refrigerant leakage of the target machine is detected, after closing the liquid pipe valve of the target machine, the method further includes: determining the change of the opening of the electronic expansion valve; and determining the predetermined time according to the change. The predetermined time can be set such that the greater the change of the opening of the electronic expansion valve, the longer the predetermined time.

[0044] In this embodiment, in order to recover the refrigerant, after the refrigerant leak is closed and the valve is closed, the compressor needs to run for a period of time to recover the refrigerant. The predetermined running time can be determined according to the opening of the electronic expansion valve. The larger the opening, the larger the flow rate of the refrigerant, and the running time can be extended at this time. The smaller the opening, the smaller the flow rate of the refrigerant, and the running time can be shortened at this time.

[0045] Furthermore, the present embodiment can also adjust the predetermined time length according to the rate of change of the temperature in the tube. The faster the rate of change of the temperature in the tube, the more external gas enters the tube, and the predetermined time length can be reduced. If the rate of change of the temperature in the tube is slow, it means that the refrigerant is being recovered and the recovery process is slow, and the predetermined time length can be increased.

[0046] As an optional example, after closing the gas pipe valve of the target machine to recover the refrigerant, the method further includes: controlling the target machine to shut down.

[0047] In this embodiment, after a predetermined period of operation, most of the refrigerant in the pipe is recovered, and the remaining part can no longer be recovered. At this time, the target machine can be directly controlled to shut down. Correspondingly, another machine in the indoor unit and the outdoor unit, in addition to the target machine, also needs to be shut down. The other machine can be shut down immediately, or it can be shut down after running for a period of time. The other machine is shut down after running for a period of time. In another embodiment, after the target device closes the liquid pipe valve, the other device is shut down, with the purpose of reducing the consumption rate of the refrigerant in the pipe of the target machine.

[0048] Figure 3 is a flow chart of this embodiment.

[0049] P1: number of steps of the electronic expansion valve at the end of the first cycle, P2: number of steps of the electronic expansion valve at the end of the second cycle, a: difference in opening degree of the electronic expansion valve.

[0050] When the unit is in cooling operation, under the condition that the indoor unit fan gear remains unchanged, the indoor unit inlet pipe temperature, outlet pipe temperature and electronic expansion valve opening are detected, and the electronic expansion valve opening of the first cycle is compared with the electronic expansion valve opening of the second cycle; when the electronic expansion valve opening P2-P1 is less than the given value a, it is judged that the system is normal, the refrigerant has not leaked, and the unit continues to operate normally; when the electronic expansion valve opening P2-P1 is greater than the given value a, it is judged that the system is abnormal, the refrigerant has leaked, and the unit enters the refrigerant leakage control operation. The unit continues to operate in cooling mode, first closes the liquid pipe valve, and the compressor continues to operate for t1 time before closing the gas pipe valve to recover the refrigerant. In another example, when the electronic expansion valve opening P2-P1 is greater than the given value a, it can be considered that the opening of the electronic expansion valve is increasing, and further monitoring can be performed. When (Pn-Pn-1) / (tn-tn-1)-(Pn-1-Pn-2) / (tn-1-tn-2)>0, it is determined that the rate of increase of the opening of the electronic expansion valve is increasing. It can be considered that the refrigerant has leaked. The above n is a positive integer greater than 2, Pn represents the opening of the electronic expansion valve at time n, tn represents time n, such as 12:00, and tn-1 is a time point one unit before 12:00, such as 11:59. In another example, the system refrigerant can be recovered to the outdoor side to reduce the amount of refrigerant on the indoor side, and the unit is shut down after the gas pipe valve is closed.

[0051] Figure 4 This is a schematic diagram of the structure of a refrigerant recovery device for a refrigeration and heating device provided in an embodiment of the present application. Figure 4 As shown, the refrigerant recovery device of the above-mentioned refrigeration and heating equipment includes:

[0052] The first processing module 402 is used to close the liquid pipe valve of the target machine when a refrigerant leakage of the target machine is detected during the process that the target machine among the indoor unit and the outdoor unit of the cooling and heating equipment is in a cooling state;

[0053] The second processing module 404 is used to close the gas pipe valve of the target machine to recover the refrigerant after the compressor of the target machine continues to run for a predetermined period of time.

[0054] Optionally, the cooling and heating equipment may be composed of an indoor unit and an outdoor unit, the indoor unit may cool or heat, when the indoor unit cools, the outdoor unit heats, when the indoor unit heats, the outdoor unit cools. The machine in the cooling state among the indoor unit and the outdoor unit is called the target machine, that is, the target machine is not fixed.

[0055] Take indoor cooling as the target machine as an example. Figure 2 As shown. In this embodiment, the indoor unit at least includes a heat exchanger, a fan, an electronic expansion valve, an inlet pipe temperature sensor, an outlet pipe temperature sensor, etc. During refrigeration operation, the refrigerant enters from the liquid pipe, enters the heat exchanger for evaporation and heat exchange after being throttled by the electronic expansion valve, and then returns to the suction end of the compressor through the gas pipe. When the wind gear is stable during refrigeration operation, the opening of the electronic expansion valve is controlled according to the difference between the inlet pipe temperature and the outlet pipe temperature of the indoor unit; when the indoor unit is in refrigeration operation, the difference between the inlet pipe temperature and the outlet pipe temperature of the indoor unit is controlled to remain unchanged. When the amount of refrigerant in the system is fixed and no leakage occurs, under the same heat exchange conditions, the opening of the electronic expansion valve is certain; but when the amount of refrigerant in the system leaks, under the same heat exchange conditions, the difference between the inlet pipe temperature and the outlet pipe temperature of the indoor unit is controlled to remain unchanged. Due to the reduction of refrigerant, the opening of the electronic expansion valve will gradually increase.

[0056] When the target machine is in the cooling state, the refrigerant in the target machine passes through the liquid pipe and then the electronic expansion valve into the heat exchanger, and then is recovered through the gas pipe. During the cooling process, it is necessary to detect whether the refrigerant has leaked. If the refrigerant is found to be leaking, the liquid pipe valve can be closed first, and the compressor continues to run. At this time, the compressor will recover part of the condensing agent in the pipeline through the gas pipe. If the environment where the condensing agent is leaked is still a sealed environment, it can be almost completely recovered through the gas pipe. If the environment where the condensing agent is leaked is not sealed, most of the condensing agent still in the pipeline can be recovered.

[0057] After the compressor has run for a predetermined period of time, the refrigerant can be considered to have been recovered and the air pipe valve can be closed.

[0058] In this embodiment, the above-mentioned predetermined time length can be set manually. The volume in the pipeline can be calculated according to the thickness and length of the pipeline, and the predetermined time length can be determined according to the volume size. The larger the volume, the longer the predetermined time length.

[0059] The solution provided by the embodiment of the present application is to close the liquid pipe valve of the target machine when a refrigerant leakage is detected in the target machine in the indoor unit and the outdoor unit of the above-mentioned cooling and heating equipment during the process of the target machine in the cooling state; and close the gas pipe valve of the above-mentioned target machine after the compressor of the above-mentioned target machine continues to run for a predetermined period of time to recover the refrigerant. Therefore, when the indoor unit or the outdoor unit of the cooling and heating equipment is cooling, if refrigerant leakage occurs, part of the refrigerant can be recovered, thereby reducing the refrigerant loss.

[0060] As an optional example, the first processing module includes: a first detection unit, which is used to determine that the refrigerant of the target machine is leaking when it is detected that the opening of the electronic expansion valve of the target machine increases or the rate of increase of the opening of the electronic expansion valve increases when the operating wind speed of the target machine remains unchanged and the difference between the inlet temperature and the outlet temperature of the target machine remains unchanged.

[0061] In the present application, whether the condensing agent has leaked can be determined by the change in the opening of the electronic expansion valve. The opening of the electronic expansion valve will change with the flow rate of the refrigerant per unit time. The larger the flow rate, the larger the opening of the electronic expansion valve. If the operating windshield of the target machine remains unchanged, and the difference between the inlet temperature and the outlet temperature of the target machine remains unchanged, it means that the refrigeration effect of the refrigerant is basically stable. At this time, the flow rate of the refrigerant should not change significantly, and thus the opening of the electronic expansion valve will not change significantly. In this case, if the opening of the electronic expansion valve increases or the rate at which the opening of the above-mentioned electronic expansion valve increases, it means that the flow rate of the refrigerant is larger, that is, more refrigerant produces the same refrigeration effect. Therefore, it can be determined that the refrigerant has leaked.

[0062] In this embodiment, the increase in the opening of the electronic expansion valve can be monitored, and it can be considered that the refrigerant has leaked when it increases to a certain degree, or it can be considered that the refrigerant has leaked when the rate of increase exceeds a certain value.

[0063] As an optional example, the first processing module includes: a second detection unit, which is used to determine that the refrigerant of the target machine is leaking when it is detected that the opening of the electronic expansion valve of the target machine increases or the rate of increase of the opening of the electronic expansion valve increases when the operating wind speed of the target machine changes, if the operating wind speed decreases and the difference between the inlet temperature and the outlet temperature of the target machine remains unchanged.

[0064] In the present application, whether the condensing agent has leaked can be determined by the change in the opening of the electronic expansion valve. The opening of the electronic expansion valve will change with the flow rate of the refrigerant per unit time. The larger the flow rate, the larger the opening of the electronic expansion valve. When the target machine is cooling, if the operating wind speed is reduced, and the difference between the inlet temperature and the outlet temperature of the above-mentioned target machine remains unchanged, then the theoretically required flow rate of the refrigerant is reduced, and the opening of the electronic expansion valve should be reduced. If the opening of the electronic expansion valve does not decrease, but still increases, or the rate of increase in the opening increases, it is considered that the refrigerant is leaking.

[0065] As an optional example, the first processing module includes: a third detection unit, for determining that the refrigerant of the target machine is leaking when it is detected that the opening of the electronic expansion valve of the target machine increases or the rate of increase of the opening of the electronic expansion valve increases if the difference between the inlet temperature and the outlet temperature of the target machine decreases when the operating wind speed of the target machine remains unchanged.

[0066] In the present application, whether the condensing agent has leaked can be determined by the change in the opening of the electronic expansion valve. The opening of the electronic expansion valve will change with the flow rate of the refrigerant per unit time. The larger the flow rate, the larger the opening of the electronic expansion valve. When the operating windshield of the target machine remains unchanged, if the difference between the inlet temperature and the outlet temperature of the above-mentioned target machine becomes smaller, then the theoretically required flow rate of the refrigerant decreases, and the opening of the electronic expansion valve should be reduced. If the opening of the electronic expansion valve does not decrease, but still increases, or the rate of increase in the opening increases, it is considered that the refrigerant is leaking.

[0067] The above is a case where the electronic expansion valve opening is used to determine whether the refrigerant is leaking. In another example, the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine can also be used to determine whether the condenser is leaking. If the opening of the electronic expansion valve remains unchanged and the operating wind speed remains unchanged, if the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine decreases, or the rate at which the difference decreases increases, it is considered that the refrigerant is leaking.

[0068] As an optional example, the device further includes: a determination module, which is used to determine the change of the opening of the electronic expansion valve after closing the liquid pipe valve of the target machine when the refrigerant leakage of the target machine is detected; and determine the predetermined time according to the change. The determination module includes: a setting unit, which is used to set the predetermined time to be longer when the change of the opening of the electronic expansion valve is greater.

[0069] In this embodiment, in order to recover the refrigerant, after the refrigerant leak is closed and the valve is closed, the compressor needs to run for a period of time to recover the refrigerant. The predetermined running time can be determined according to the opening of the electronic expansion valve. The larger the opening, the larger the flow rate of the refrigerant, and the running time can be extended at this time. The smaller the opening, the smaller the flow rate of the refrigerant, and the running time can be shortened at this time.

[0070] Furthermore, the present embodiment can also adjust the predetermined time length according to the rate of change of the temperature in the tube. The faster the rate of change of the temperature in the tube, the more external gas enters the tube, and the predetermined time length can be reduced. If the rate of change of the temperature in the tube is slow, it means that the refrigerant is being recovered and the recovery process is slow, and the predetermined time length can be increased.

[0071] As an optional example, the above-mentioned device also includes: a control module, which is used to control the target machine to shut down after closing the gas pipe valve of the target machine to recover the refrigerant.

[0072] In this embodiment, after a predetermined period of operation, most of the refrigerant in the pipe is recovered, and the remaining part can no longer be recovered. At this time, the target machine can be directly controlled to shut down. Correspondingly, another machine in the indoor unit and the outdoor unit, in addition to the target machine, also needs to be shut down. The other machine can be shut down immediately, or it can be shut down after running for a period of time. The other machine is shut down after running for a period of time. In another embodiment, after the target device closes the liquid pipe valve, the other device is shut down, with the purpose of reducing the consumption rate of the refrigerant in the pipe of the target machine.

[0073] Figure 3 is a flow chart of this embodiment.

[0074] P1: number of steps of the electronic expansion valve at the end of the first cycle, P2: number of steps of the electronic expansion valve at the end of the second cycle, a: difference in opening degree of the electronic expansion valve.

[0075] When the unit is in cooling operation, with the indoor unit fan gear unchanged, the indoor unit inlet pipe temperature, outlet pipe temperature and electronic expansion valve opening are detected, and the electronic expansion valve opening in the first cycle is compared with the electronic expansion valve opening in the second cycle; when the electronic expansion valve opening P2-P1 is less than the given value a, the system is judged to be normal, the refrigerant has not leaked, and the unit continues to operate normally; when the electronic expansion valve opening P2-P1 is greater than the given value a, the system is judged to be abnormal, the refrigerant has leaked, and the unit enters the refrigerant leakage control operation. The unit continues to operate in cooling, first closes the liquid pipe valve, and the compressor continues to run for t1 time, then closes the gas pipe valve to recover the refrigerant. In another example, the system refrigerant can be recovered to the outdoor side to reduce the amount of refrigerant in the indoor part, and the unit is shut down after closing the gas pipe valve.

[0076] like Figure 5 As shown, an embodiment of the present application provides an electronic device, including a processor 111, a communication interface 112, a memory 113 and a communication bus 114, wherein the processor 111, the communication interface 112, and the memory 113 communicate with each other through the communication bus 114.

[0077] Memory 113, used for storing computer programs;

[0078] In one embodiment of the present application, the processor 111 is used to implement the refrigerant recovery method for the refrigeration and heating equipment provided by any one of the aforementioned method embodiments when executing the program stored in the memory 113.

[0079] An embodiment of the present application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, a refrigerant recovery method for a refrigeration and heating device as provided in any of the aforementioned method embodiments is implemented.

[0080] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0081] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course, by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0082] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0083] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A refrigerant recovery method for refrigeration and heating equipment, characterized in that: include: When a target machine among the indoor unit and the outdoor unit of the cooling and heating equipment is in a cooling state, when a refrigerant leakage of the target machine is detected, closing a liquid pipe valve of the target machine; After the compressor of the target machine continues to run for a predetermined period of time, the gas pipe valve of the target machine is closed to recover the refrigerant.

2. The method according to claim 1, characterized in that Detecting whether the target machine refrigerant leaks includes: When the operating wind speed of the target machine remains unchanged and the difference between the inlet temperature and the outlet temperature of the target machine remains unchanged, when it is detected that the opening of the electronic expansion valve of the target machine increases or the rate of increase of the opening of the electronic expansion valve increases, it is determined that the refrigerant of the target machine is leaking.

3. The method according to claim 1, characterized in that Detecting whether the target machine refrigerant leaks includes: When the operating wind speed of the target machine changes, if the operating wind speed decreases and the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine remains unchanged, then when it is detected that the opening of the electronic expansion valve of the target machine increases or the rate of increase of the opening of the electronic expansion valve increases, it is determined that the refrigerant of the target machine is leaking.

4. The method according to claim 1, characterized in that: Detecting whether the target machine refrigerant leaks includes: When the operating wind speed of the target machine remains unchanged, if the difference between the inlet temperature and the outlet temperature of the target machine becomes smaller, when it is detected that the opening of the electronic expansion valve of the target machine increases or the rate of increase of the opening of the electronic expansion valve increases, it is determined that the refrigerant of the target machine is leaking.

5. The method according to claim 1, characterized in that When a refrigerant leak of the target machine is detected, after closing the liquid pipe valve of the target machine, the method further includes: Determine the change in the opening degree of the electronic expansion valve; The predetermined duration is determined according to the change.

6. The method according to claim 5, characterized in that Determining the predetermined duration according to the change includes: The predetermined time period is set to be longer as the change in the opening degree of the electronic expansion valve is greater.

7. The method according to claim 1, characterized in that After closing the gas pipe valve of the target machine to recover the refrigerant, the method further includes: The target machine is controlled to shut down.

8. A refrigerant recovery device for refrigeration and heating equipment, characterized in that: include: A first processing module is used for closing a liquid pipe valve of a target machine when a refrigerant leakage of the target machine is detected during the process that the target machine among the indoor unit and the outdoor unit of the refrigeration and heating equipment is in a refrigeration state; The second processing module is used to close the gas pipe valve of the target machine to recover the refrigerant after the compressor of the target machine continues to run for a predetermined period of time.

9. An electronic device, characterized in that: include: at least one communication interface; at least one bus connected to the at least one communication interface; at least one processor coupled to the at least one bus; At least one memory connected to the at least one bus, wherein a computer program is stored in the memory, and when the processor executes the computer program, the refrigerant recovery method for the refrigeration and heating equipment described in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the refrigerant recovery method for refrigeration and heating equipment according to any one of claims 1 to 7 of the present application.

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