Refrigerant recovery method, device, storage medium, and electronic device for a refrigeration and heating apparatus

Abstract

The application relates to a refrigerant recovery method and device of a refrigerating and heating equipment, a storage medium and an electronic device. The method comprises the following steps: when it is detected that refrigerant of a target machine leaks in a process that an indoor unit and the target machine in an outdoor unit of the refrigerating and heating equipment are in a refrigeration state, closing a liquid pipe valve of the target machine; after the compressor of the target machine continues to operate for a predetermined time length, closing a gas pipe valve of the target machine to recover the refrigerant. The application solves the technical problem that refrigerant loss is caused by refrigerant leakage.

Description

TECHNICAL FIELD

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

[0002] In the prior art, in the process of using a refrigeration and heating device for refrigeration or heating, one of the indoor unit and the outdoor unit of the refrigeration and heating device is responsible for refrigeration, and the other is responsible for heating, so as to complete the refrigeration or heating demand of the indoor unit. However, during the refrigeration process of the indoor unit or the outdoor unit of the refrigeration and heating device, refrigerant leakage may occur. If the refrigerant leaks, the refrigerant is lost. SUMMARY

[0003] The present application provides a refrigerant recovery method and device of a refrigeration and heating device, a storage medium and an electronic device 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 of a refrigeration and heating device, comprising: during the process that a target machine in the indoor unit and the outdoor unit of the refrigeration and heating device is in a refrigeration state, when it is detected that refrigerant of the target machine leaks, closing a liquid pipe valve of the target machine; after the compressor of the target machine continues to run for a predetermined time length, closing a gas pipe valve of the target machine to recover the refrigerant.

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

[0006] As an optional example, the first processing module comprises: a first detection unit, configured to, when the running air damper of the target machine does not change and the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine does not change, if it is detected that the opening degree of the electronic expansion valve of the target machine increases or the rate at which the opening degree of the electronic expansion valve increases becomes larger, it is determined that the refrigerant of the target machine leaks.

[0007] As an optional example, the first processing module comprises a second detection unit configured to, when the running air volume of the target machine changes, if the running air volume decreases and the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine remains unchanged, determine that the refrigerant of the target machine leaks in the case that the opening of the electronic expansion valve of the target machine is detected to increase or the rate of the opening of the electronic expansion valve to increase is detected to increase.

[0008] As an optional example, the first processing module comprises a third detection unit configured to, when the running air volume of the target machine remains unchanged, if the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine decreases, determine that the refrigerant of the target machine leaks in the case that the opening of the electronic expansion valve of the target machine is detected to increase or the rate of the opening of the electronic expansion valve to increase is detected to increase.

[0009] As an optional example, the device further comprises a determination module configured to, when the refrigerant of the target machine is detected to leak, determine the change of the opening of the electronic expansion valve after the liquid pipe valve of the target machine is closed; and determine the predetermined time length according to the change.

[0010] As an optional example, the determination module comprises a setting unit configured to set the predetermined time length to be longer when the change of the opening of the electronic expansion valve is greater.

[0011] As an optional example, the device further comprises a control module configured to control the target machine to stop after the gas pipe valve of the target machine is closed to recover the refrigerant.

[0012] In a third aspect, the present application provides an electronic device, comprising: at least one communication interface; at least one bus connected with the at least one communication interface; at least one processor connected with the at least one bus; and at least one memory connected with the at least one bus, wherein the memory stores a computer program, and the processor is configured to execute the computer program to implement the refrigerant recovery method of the refrigeration and heating device.

[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 the refrigeration and heating device.

[0014] Compared with the prior art, the technical scheme provided by the embodiment of the present application has the following advantages: the scheme provided by the embodiment of the present application, when the target machine in the indoor unit and the outdoor unit of the refrigeration and heating equipment is in a refrigeration state, and when refrigerant leakage of the target machine is detected, the liquid pipe valve of the target machine is closed; after the compressor of the target machine continues to operate for a predetermined time length, the gas pipe valve of the target machine is closed, so as to recover the refrigerant, thereby when refrigerant leakage occurs when the indoor unit or the outdoor unit of the refrigeration and heating equipment is refrigerating, part of the refrigerant can be recovered, and the loss of refrigerant is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows: obviously, for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0017] One or more embodiments are exemplarily illustrated by pictures in the drawings corresponding thereto, and these exemplary illustrations do not constitute a limitation on the embodiments, elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified, the drawings do not constitute a proportional limitation.

[0018] Figure 1 A flowchart of a refrigerant recovery method of a refrigeration and heating equipment provided by the embodiment of the present application is shown in the figure.

[0019] Figure 2 A device schematic diagram of a refrigerant recovery method of a refrigeration and heating equipment provided by the embodiment of the present application is shown in the figure.

[0020] Figure 3 A flowchart of another refrigerant recovery method of a refrigeration and heating equipment provided by the embodiment of the present application is shown in the figure.

[0021] Figure 4 A structural schematic diagram of a refrigerant recovery device of a refrigeration and heating equipment provided by the embodiment of the present application is shown in the figure.

[0022] Figure 5 An electronic device schematic diagram provided by the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0023] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0024] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplifying the present application's disclosure, the components and arrangements of the specific examples are described in the following. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application can repeat reference numerals and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not indicate the relationship between the various embodiments and / or arrangements 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 of a refrigerating and heating device, which can reduce refrigerant loss when refrigerant leakage occurs.

[0026] Figure 1 A flow chart of a refrigerant recovery method of a refrigerating and heating device provided by the embodiments of the present application is shown in FIG. 1. Figure 1 As shown in FIG. 1, the refrigerant recovery method of the refrigerating and heating device comprises the following steps.

[0027] S102, when it is detected that refrigerant leakage occurs in a target machine in the indoor unit and the outdoor unit of the refrigerating and heating device in the process that the target machine is in a refrigeration state, closing a liquid pipe valve of the target machine;

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

[0029] Optionally, the refrigerating and heating device can be composed of an indoor unit and an outdoor unit. The indoor unit can be in a refrigeration state or a heating state. When the indoor unit is in the refrigeration state, the outdoor unit is in the heating state. When the indoor unit is in the heating state, the outdoor unit is in the refrigeration state. The machine in the refrigeration state in the indoor unit and the outdoor unit is referred to as a target machine, that is, the target machine is not fixed.

[0030] Taking the indoor unit in the refrigeration state as the target machine as an example, the refrigerant recovery method of the refrigerating and heating device comprises the following steps. Figure 2The indoor unit at least includes a heat exchanger, a fan, an electronic expansion valve, an inlet pipe temperature sensor, an outlet pipe temperature sensor, and the like. In the refrigeration operation, the refrigerant enters from the liquid pipe, passes through the electronic expansion valve, enters the heat exchanger to evaporate and exchange heat, and then returns to the suction end of the compressor through the gas pipe. When the air damper is stable and unchanged, the opening degree 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 be unchanged. When the system refrigerant quantity is fixed and no leakage occurs, the opening degree of the electronic expansion valve is constant under the same heat exchange condition. However, when the system refrigerant quantity leaks, the difference between the inlet pipe temperature and the outlet pipe temperature of the indoor unit is controlled to be unchanged, and the opening degree of the electronic expansion valve gradually increases due to the decrease of the refrigerant.

[0031] When the target machine is in the refrigeration state, the refrigerant in the target machine passes through the liquid pipe, passes through the electronic expansion valve, enters the heat exchanger, and then returns through the gas pipe. In the refrigeration process, whether the refrigerant leaks is detected. If it is found that the refrigerant leaks, the liquid pipe valve can be closed first, and the compressor continues to operate, at this time the compressor will recover part of the condensate in the pipe through the gas pipe. If the environment after the condensate leaks is still a sealed environment, almost all of the condensate can be recovered through the gas pipe. If the environment after the condensate leaks is not sealed, most of the condensate still in the pipe can be recovered.

[0032] After the compressor operates for a predetermined length of time, it can be considered that the condensate has been recovered, at which time the gas pipe valve can be closed.

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

[0034] The scheme provided by the embodiment of the application can close the liquid pipe valve of the target machine when it is detected that the refrigerant of the target machine leaks during the process in which the indoor unit and the outdoor unit of the refrigeration and heating equipment are in the refrigeration state. After the compressor of the target machine continues to operate for a predetermined length of time, the gas pipe valve of the target machine is closed to recover the refrigerant. Therefore, when the indoor unit or the outdoor unit of the refrigeration and heating equipment is in refrigeration, if the refrigerant leaks, part of the refrigerant can be recovered, and the loss of refrigerant is reduced.

[0035] As an optional example, detecting whether the refrigerant of the target machine leaks includes: when the running air volume of the target machine is changed, if the running air volume is reduced and the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine is unchanged, and if it is detected that the opening of the electronic expansion valve of the target machine is increased or the rate of increase of the opening of the electronic expansion valve is increased, it is determined that the refrigerant of the target machine leaks.

[0036] In the present application, whether the refrigerant leaks can be determined by the change of the opening of the electronic expansion valve. The opening of the electronic expansion valve changes with the flow rate of the refrigerant per unit time. The greater the flow rate, the greater the opening of the electronic expansion valve. If the running air volume of the target machine is unchanged and the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine is 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, so the opening of the electronic expansion valve should not change significantly. In this case, if the opening of the electronic expansion valve is increased or the rate of increase of the opening of the electronic expansion valve is increased, it means that the flow rate of the refrigerant is greater, that is, more refrigerant produces the same refrigeration effect. Therefore, it can be determined that the refrigerant leaks.

[0037] In the present embodiment, the increase of the opening of the electronic expansion valve can be monitored. If the opening increases to a certain extent, it is considered that the refrigerant leaks, or if the rate of increase exceeds a certain value, it is considered that the refrigerant leaks.

[0038] As an optional example, detecting whether the refrigerant of the target machine leaks includes: when the running air volume of the target machine is changed, if the running air volume is reduced and the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine is unchanged, and if it is detected that the opening of the electronic expansion valve of the target machine is increased or the rate of increase of the opening of the electronic expansion valve is increased, it is determined that the refrigerant of the target machine leaks.

[0039] In the present application, whether the refrigerant leaks can be determined by the change of the opening of the electronic expansion valve. The opening of the electronic expansion valve changes with the flow rate of the refrigerant per unit time. The greater the flow rate, the greater the opening of the electronic expansion valve. When the target machine is refrigerating, if the running air volume is reduced and the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine is unchanged, the flow rate of the refrigerant theoretically needs to be reduced. At this time, the opening of the electronic expansion valve should be reduced. If the opening of the electronic expansion valve does not decrease but increases, or the rate of increase of the opening is increased, it is considered that the refrigerant leaks.

[0040] As an optional example, detecting whether the target machine refrigerant leaks includes: when the running air volume of the target machine is unchanged, if the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine becomes smaller, in the case of detecting that the opening of the electronic expansion valve of the target machine increases or the rate of the opening of the electronic expansion valve increases, it is determined that the refrigerant of the target machine leaks.

[0041] In this application, whether the condensing agent leaks can be determined by the change of the opening of the electronic expansion valve. The opening of the electronic expansion valve changes with the flow rate of the refrigerant per unit time. The greater the flow rate, the greater the opening of the electronic expansion valve. When the running air volume of the target machine is unchanged, if the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine becomes smaller, theoretically the flow rate of the required refrigerant decreases, at this time the opening of the electronic expansion valve should decrease. If the opening of the electronic expansion valve does not decrease, but still increases, or the rate of the opening increases, it is considered that the refrigerant leaks.

[0042] The above is the case of using the opening of the electronic expansion valve to determine whether the refrigerant leaks. In another example, whether the condensing machine leaks can also be determined according to the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine. If the opening of the electronic expansion valve is unchanged and the running air volume is unchanged, if the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine decreases, or the rate of the decrease of the difference becomes larger, it is considered that the refrigerant leaks.

[0043] As an optional example, when it is detected that the refrigerant of the target machine leaks, 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; determining the predetermined time according to the change. The predetermined time can be set to be longer when the change of the opening of the electronic expansion valve is greater.

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

[0045] In addition, the predetermined time can also be adjusted according to the rate of change of the pipe temperature. The faster the rate of change of the pipe temperature, the more external gas enters the pipe, and the predetermined time can be reduced. If the rate of change of the pipe temperature is slow, it means that the refrigerant is being recovered, and the recovery process is slow, so the predetermined time 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 comprises: controlling the target machine to stop.

[0047] In this embodiment, after running for a predetermined period of time, most of the refrigerant in the pipe is recovered, and the remaining part cannot be recovered. At this time, the target machine can be directly controlled to stop. Correspondingly, the other machine in the indoor unit and the outdoor unit also needs to be stopped, except for the target machine. The other machine can be immediately stopped or can be run for a period of time before stopping. In another embodiment, after the target device closes the liquid pipe valve, the other device stops, which aims to reduce the consumption rate of the refrigerant in the pipe of the target machine.

[0048] Figure 3 The flow chart of this embodiment.

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

[0050] When the unit is running in refrigeration mode, the indoor unit fan speed is unchanged, the indoor unit inlet pipe temperature, outlet pipe temperature and the opening degree of the electronic expansion valve are detected, and the first period electronic expansion valve opening degree and the second period electronic expansion valve opening degree are compared. When the electronic expansion valve opening degree P2-P1 is less than a given value a, it is judged that the system is normal and the refrigerant has not leaked, and the unit continues to run normally. When the electronic expansion valve opening degree P2-P1 is greater than the given value a, it is judged that the system is abnormal and the refrigerant has leaked, and the unit enters refrigerant leakage control operation. The unit continues to run in refrigeration mode, first closes the liquid pipe valve, and then closes the gas pipe valve after the compressor continues to run for t1 time to recover the refrigerant. In another example, when the electronic expansion valve opening degree P2-P1 is greater than the given value a, it can be considered that the opening degree 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 degree 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 degree of the electronic expansion valve at time n, tn represents the time point before 12:00, for example, 11:59. In another example, the system refrigerant can be recovered to the outdoor side, the amount of refrigerant on the indoor side is reduced, and the unit stops after the gas pipe valve is closed.

[0051] Figure 4 A structure diagram of a refrigerant recovery device of a refrigeration and heating device provided in an embodiment of the present application is shown in FIG. 1. Figure 4 The refrigerant recovery device of the refrigeration and heating device comprises:

[0052] The first processing module 402 is configured to, in a process in which the target machine in the indoor unit and the outdoor unit of the refrigeration and heating device is in a refrigeration state, close a liquid pipe valve of the target machine when it is detected that refrigerant of the target machine leaks.

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

[0054] Optionally, the refrigeration and heating device can be composed of an indoor unit and an outdoor unit. The indoor unit can be in a refrigeration state or a heating state. When the indoor unit is in the refrigeration state, the outdoor unit is in the heating state; and when the indoor unit is in the heating state, the outdoor unit is in the refrigeration state. The machine in the refrigeration state in the indoor unit and the outdoor unit is referred to as a target machine, that is, the target machine is not fixed.

[0055] For example, taking the indoor unit in the refrigeration state as the target machine, as shown in FIG. 1. Figure 2 In this embodiment, the indoor unit at least includes a heat exchanger, a fan, an electronic expansion valve, an inlet pipe temperature sensor and an outlet pipe temperature sensor. In the refrigeration operation, the refrigerant enters the heat exchanger through the liquid pipe, is throttled by the electronic expansion valve, evaporates and exchanges heat in the heat exchanger, and then returns to the suction end of the compressor through the gas pipe. When the wind scale is stable and does not change, the opening degree 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 the refrigeration operation, the difference between the inlet pipe temperature and the outlet pipe temperature of the indoor unit is controlled to be constant. When the system refrigerant amount is fixed and no leakage occurs, the opening degree of the electronic expansion valve is constant under the same heat exchange condition. However, when the system refrigerant amount leaks, the opening degree of the electronic expansion valve will gradually increase under the same heat exchange condition, while the difference between the inlet pipe temperature and the outlet pipe temperature of the indoor unit is constant.

[0056] When the target machine is in the refrigeration state, the refrigerant in the target machine enters the heat exchanger through the liquid pipe and the electronic expansion valve, and is recovered through the gas pipe. In the refrigeration process, whether the refrigerant leaks is detected. If it is found that the refrigerant leaks, the liquid pipe valve can be closed first, and the compressor continues to operate. At this time, the compressor recovers part of the condensate in the pipe through the gas pipe. If the environment in which the condensate leaks is still a sealed environment, the condensate can be almost recovered through the gas pipe. If the environment in which the condensate leaks is not sealed, most of the condensate still in the pipe can be recovered.

[0057] After the compressor operates for a predetermined time length, it can be considered that the condensate has been recovered, and the gas pipe valve can be closed at this time.

[0058] In the embodiment, the predetermined time length can be artificially set, 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. The larger the volume is, the longer the predetermined time length is.

[0059] The scheme provided in the embodiment of the application can close the liquid pipe valve of the target machine when detecting that the refrigerant of the target machine leaks during the process that the target machine in the indoor unit and the outdoor unit of the refrigerating and heating equipment is in the refrigeration state, and can close the gas pipe valve of the target machine after the compressor of the target machine continues to operate for a predetermined time length, so as to recover the refrigerant. Therefore, if the refrigerant leaks when the indoor unit or the outdoor unit of the refrigerating and heating equipment is in the refrigeration state, part of the refrigerant can be recovered, and the loss of the refrigerant is reduced.

[0060] As an optional example, the first processing module includes a first detection unit configured to determine that the refrigerant of the target machine leaks when detecting 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 becomes larger, while the running air volume of the target machine is unchanged and the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine is unchanged.

[0061] In the application, whether the refrigerant leaks can be determined according to the change of the opening of the electronic expansion valve. The opening of the electronic expansion valve changes with the flow rate of the refrigerant per unit time. The larger the flow rate is, the larger the opening of the electronic expansion valve is. If the running air volume of the target machine is unchanged and the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine is unchanged, it indicates that the refrigeration effect of the refrigerant is basically stable. At this time, the flow rate of the refrigerant should not change obviously, and the opening of the electronic expansion valve should not change obviously. In this case, if the opening of the electronic expansion valve increases or the rate at which the opening of the electronic expansion valve increases becomes larger, it indicates 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 leaks.

[0062] In the embodiment, the increase of the opening of the electronic expansion valve can be monitored. When the opening increases to a certain extent or the rate of the increase exceeds a certain value, it is considered that the refrigerant leaks.

[0063] As an optional example, the first processing module includes a second detection unit configured to determine that the refrigerant of the target machine leaks when detecting 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 becomes larger, while the running air volume of the target machine changes, the running air volume decreases, and the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine is unchanged.

[0064] In the present application, whether the refrigerant leaks can be determined by the change of the opening of the electronic expansion valve. The opening of the electronic expansion valve changes with the flow rate of the refrigerant per unit time. The greater the flow rate, the greater the opening of the electronic expansion valve. When the running air damper of the target machine is unchanged, if the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine becomes smaller, theoretically, the flow rate of the refrigerant needed is reduced, and at this time, 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 the increase of the opening of the electronic expansion valve becomes greater, it is considered that the refrigerant leaks.

[0065] As an optional example, the first processing module comprises a third detection unit configured to, when the running air damper of the target machine is unchanged, if the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine becomes smaller, determine that the refrigerant of the target machine leaks when it is detected that the opening of the electronic expansion valve of the target machine increases or the rate of the increase of the opening of the electronic expansion valve becomes greater.

[0066] In the present application, whether the refrigerant leaks can be determined by the change of the opening of the electronic expansion valve. The opening of the electronic expansion valve changes with the flow rate of the refrigerant per unit time. The greater the flow rate, the greater the opening of the electronic expansion valve. When the running air damper of the target machine is unchanged, if the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine becomes smaller, theoretically, the flow rate of the refrigerant needed is reduced, and at this time, 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 the increase of the opening of the electronic expansion valve becomes greater, it is considered that the refrigerant leaks.

[0067] The above is the case of using the opening of the electronic expansion valve to determine whether the refrigerant leaks. In another example, whether the refrigerant leaks can also be determined according to the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine. If the opening of the electronic expansion valve is unchanged, and the running air damper is unchanged, if the difference between the inlet pipe temperature and the outlet pipe temperature of the target machine decreases, or the rate of the decrease of the difference between the inlet pipe temperature and the outlet pipe temperature becomes greater, it is considered that the refrigerant leaks.

[0068] As an optional example, the device further comprises a determination module configured to, when it is detected that the refrigerant of the target machine leaks, determine the change of the opening of the electronic expansion valve after the liquid pipe valve of the target machine is closed, and determine a predetermined time period according to the change. The determination module comprises a setting unit configured to set the predetermined time period 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, the compressor is operated for a predetermined time after the valve is closed after the refrigerant leakage is closed. The predetermined time can be determined according to the opening degree of the electronic expansion valve. The greater the opening degree, the greater the flow of refrigerant, and the operating time can be extended. The smaller the opening degree, the smaller the flow of refrigerant, and the operating time can be shortened.

[0070] In addition, the predetermined time can also be adjusted according to the rate of change of the temperature in the pipe. The faster the rate of change of the temperature in the pipe, the more external gas enters the pipe, and the predetermined time can be reduced. If the rate of change of the temperature in the pipe is slow, it means that the refrigerant is being recovered and the recovery process is slow, and the predetermined time can be increased.

[0071] As an optional example, the device further comprises a control module for controlling the target machine to stop after the gas pipe valve of the target machine is closed to recover the refrigerant.

[0072] In this embodiment, after operating for a predetermined time, most of the refrigerant in the pipe is recovered, and the remaining part cannot be recovered. At this time, the target machine can be directly controlled to stop. Correspondingly, in addition to the target machine, the other machine in the indoor unit and the outdoor unit also needs to be stopped. The other machine can be immediately stopped or operated for a period of time and then stopped. In another embodiment, after the target device closes the liquid pipe valve, the other device stops, which aims to reduce the consumption speed of the refrigerant in the pipe of the target machine.

[0073] Figure 3 The flowchart of this embodiment is shown in the figure.

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

[0075] When the unit is in refrigeration operation, the indoor unit fan speed is unchanged, the indoor unit inlet pipe temperature, outlet pipe temperature and electronic expansion valve opening degree are detected, and the first cycle electronic expansion valve opening degree and the second cycle electronic expansion valve opening degree are compared. When the electronic expansion valve opening degree P2-P1 is less than a given value a, it is judged that the system is normal and the refrigerant has not leaked, and the unit continues to operate normally. When the electronic expansion valve opening degree P2-P1 is greater than the given value a, it is judged that the system is abnormal and the refrigerant has leaked, and the unit enters refrigerant leakage control operation. The unit continues to operate in refrigeration mode, first closes the liquid pipe valve, and then closes the gas pipe valve after the compressor continues to operate for t1 time to recover the refrigerant. In another example, the system refrigerant can be recovered to the outdoor side, the amount of refrigerant on the indoor side is reduced, and the unit stops after the gas pipe valve is closed.

[0076] AsFigure 5 As shown, the embodiment of the present application provides an electronic device, comprising 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 complete mutual communication through the communication bus 114,

[0077] The memory 113 is used for storing a computer program.

[0078] In an embodiment of the present application, the processor 111 is used for executing the program stored in the memory 113, and realizes the refrigerant recovery method of the refrigeration and heating device provided by any one of the preceding method embodiments.

[0079] The embodiment of the present application also provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the refrigerant recovery method of the refrigeration and heating device provided by any one of the preceding method embodiments.

[0080] The device embodiments described above are only schematic, wherein the units shown as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., can be located in one place or distributed on a plurality of network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment.

[0081] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be realized by means of software plus a general hardware platform, and of course can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of software products, and the computer software products can be stored in a computer readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and include a plurality of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiments.

[0082] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order

[0083] The above description is merely that of the specific embodiments of the application and as such is not to be taken in a limiting sense. Various modifications and alterations of the embodiments described herein will become apparent to those skilled in the art from the foregoing description, which does not limit the generality presented. It is the intention that all such modifications and alterations be considered equaliy by the spirit and scope of this application. It is therefore intended to cover in the appended claims all such changes and alterations that come within the scope of this application.

Claims

1. A method for refrigerant recovery in a refrigeration and heating device, characterized in that, include: When the target machine in the indoor and outdoor units of the cooling and heating equipment is in a cooling state, if a refrigerant leak is detected in the target machine, the liquid pipe valve of the target machine is closed. 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; The detection of refrigerant leakage in the target machine includes: when the operating fan speed of the target machine remains unchanged and the difference between the inlet and outlet pipe temperatures remains unchanged, if an increase in the opening degree of the electronic expansion valve or a faster rate of increase in the opening degree of the electronic expansion valve is detected, then a refrigerant leak is determined to have occurred in the target machine; or, when the operating fan speed of the target machine changes, if the operating fan speed decreases and the difference between the inlet and outlet pipe temperatures remains unchanged, if an increase in the opening degree of the electronic expansion valve or a faster rate of increase in the opening degree of the electronic expansion valve is detected, then a refrigerant leak is determined to have occurred in the target machine; or, when the operating fan speed of the target machine remains unchanged, if the difference between the inlet and outlet pipe temperatures decreases, if an increase in the opening degree of the electronic expansion valve or a faster rate of increase in the opening degree of the electronic expansion valve is detected, then a refrigerant leak is determined to have occurred in the target machine.

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

3. The method according to claim 2, characterized in that, Determining the predetermined duration based on the changes includes: The predetermined duration is set such that the greater the change in the opening of the electronic expansion valve, the longer the predetermined duration.

4. The method according to claim 1, characterized in that, After closing the gas valve of the target machine to recover the refrigerant, the method further includes: Control the target machine to stop.

5. A refrigerant recovery device for refrigeration and heating equipment, characterized in that, include: The first processing module is used to close the liquid pipe valve of the target machine when a refrigerant leak is detected in the target machine during the cooling process of the target machine in the indoor unit and outdoor unit of the cooling and heating equipment. The second processing module is used to close the gas pipe valve of the target machine after the compressor of the target machine continues to run for a predetermined period of time, so as to recover the refrigerant; The detection of refrigerant leakage in the target machine includes: when the operating fan speed of the target machine remains unchanged and the difference between the inlet and outlet pipe temperatures remains unchanged, if an increase in the opening degree of the electronic expansion valve or a faster rate of increase in the opening degree of the electronic expansion valve is detected, then a refrigerant leak is determined to have occurred in the target machine; or, when the operating fan speed of the target machine changes, if the operating fan speed decreases and the difference between the inlet and outlet pipe temperatures remains unchanged, if an increase in the opening degree of the electronic expansion valve or a faster rate of increase in the opening degree of the electronic expansion valve is detected, then a refrigerant leak is determined to have occurred in the target machine; or, when the operating fan speed of the target machine remains unchanged, if the difference between the inlet and outlet pipe temperatures decreases, if an increase in the opening degree of the electronic expansion valve or a faster rate of increase in the opening degree of the electronic expansion valve is detected, then a refrigerant leak is determined to have occurred in the target machine.

6. 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 connected to the at least one bus; At least one memory connected to the at least one bus, wherein the memory stores a computer program, and the processor executes the computer program to implement the refrigerant recovery method of the refrigeration and heating equipment according to any one of claims 1 to 4.

7. A computer-readable storage medium storing computer-executable instructions for performing the refrigerant recovery method of the refrigeration and heating equipment according to any one of claims 1 to 4 of this application.

Images