Refrigerant leakage control method and device and air conditioning unit

Abstract

The invention relates to the technical field of air conditioners, in particular to a refrigerant leakage control method and device and an air conditioning unit. The air conditioner aims to solve the problems that the size of the air conditioner outdoor unit is increased due to the fact that a refrigerant recycling component is arranged to recycle refrigerants, an air conditioner unit is greatly changed, and cost is high. In order to achieve the purpose, the control method comprises the steps that the refrigerant leakage speed is obtained; determining a heat exchanger of the indoor unit with refrigerant leakage as a target indoor heat exchanger; and under the condition that the refrigerant leakage speed is smaller than or equal to a preset threshold value, the operation state of the air conditioning unit is controlled, and the refrigerant in the target indoor heat exchanger is recycled into the outdoor unit. According to the control method, the original structure of the air conditioning unit can be used for refrigerant recovery, the air conditioning unit is slightly changed, the refrigerant leakage amount can be reduced, and meanwhile the cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, and particularly relates to a method and device for controlling refrigerant leakage and an air conditioner unit. Background Art

[0002] Refrigerant is an essential substance in the operation of a multi-connected air conditioner. Among them, R32 refrigerant has gradually replaced traditional refrigerants such as R22 and R410a in the air conditioner industry due to its environmental protection characteristics of not destroying the ozone layer, its advantages of having less impact on the greenhouse effect, as well as its excellent thermophysical properties and safety. However, R32 refrigerant has low flammability, and once leakage occurs, it is easy to cause combustion or even explosion.

[0003] In related technologies, an air conditioner unit is provided with a refrigerant recovery component. When refrigerant leakage occurs in the air conditioner unit, the refrigerant is recovered into the refrigerant recovery component. However, recovering the refrigerant by setting a refrigerant recovery component will increase the volume of the outdoor unit of the air conditioner, and the modification to the air conditioner unit is relatively large, with a high cost.

[0004] Correspondingly, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0005] In order to solve at least one of the above problems in the prior art, that is, to solve the problems that recovering the refrigerant by setting a refrigerant recovery component will increase the volume of the outdoor unit of the air conditioner, and the modification to the air conditioner unit is relatively large, with a high cost.

[0006] The present application provides a method for controlling refrigerant leakage, which is applied to an air conditioner unit. The air conditioner unit includes an indoor unit and an outdoor unit, and the indoor unit is provided with an indoor heat exchanger. When refrigerant leakage occurs in the indoor unit, the control method includes: obtaining the refrigerant leakage speed; determining the heat exchanger of the indoor unit where refrigerant leakage occurs as the target indoor heat exchanger; and when the refrigerant leakage speed is less than or equal to a preset threshold, controlling the operating state of the air conditioner unit to recover the refrigerant in the target indoor heat exchanger into the outdoor unit.

[0007] In some embodiments, the outdoor unit is provided with a compressor. The step of "controlling the operating state of the air conditioner unit to recover the refrigerant in the target indoor heat exchanger into the outdoor unit" further includes: controlling the non-leaking indoor heat exchanger to be disconnected from the refrigerant circuit; controlling the air conditioner unit to switch to the cooling mode; cutting off the refrigerant channel from the outdoor unit to the indoor unit; and controlling the compressor to operate to recover the refrigerant in the target indoor heat exchanger into the outdoor unit.

[0008] In some embodiments, stop valves are provided at both the inlet end and the outlet end of each indoor heat exchanger; the step of "disconnecting the indoor heat exchanger without leakage from the refrigerant circuit" further includes: controlling all the stop valves of the indoor heat exchanger without leakage to be closed.

[0009] In some embodiments, the indoor unit includes an indoor heat exchanger, and the outdoor unit includes an outdoor heat exchanger; the air conditioner unit further includes: a liquid pipe communicating between the outdoor heat exchanger and the indoor heat exchanger; a liquid-side cut-off valve provided between the liquid pipe and the indoor heat exchanger; the step of "cutting off the refrigerant passage from the outdoor unit to the indoor unit" further includes: controlling the liquid-side cut-off valve to be closed.

[0010] In some embodiments, the outdoor unit further includes a gas-liquid separator provided at the suction end of the compressor; the step of "recovering the refrigerant in the target indoor heat exchanger into the outdoor unit" further includes: recovering the refrigerant in the target indoor heat exchanger into the outdoor heat exchanger, the liquid pipe, and the gas-liquid separator.

[0011] In some embodiments, the control method further includes: monitoring the liquid level height of the gas-liquid separator; when the liquid level height is greater than or equal to the height threshold, controlling the air conditioner unit to stop recovering the refrigerant in the target indoor heat exchanger; when the liquid level height is less than the height threshold, controlling the operation of the air conditioner unit according to the compression ratio of the compressor.

[0012] In some embodiments, the step of "when the liquid level height is less than the height threshold, controlling the operation of the air conditioner unit according to the compression ratio of the compressor" further includes: when the compression ratio is greater than or equal to the compression ratio threshold, controlling the air conditioner unit to stop recovering the refrigerant in the target indoor heat exchanger.

[0013] In some embodiments, after the air conditioner unit stops recovering the refrigerant, the control method further includes: cutting off the refrigerant passage from the indoor unit to the compressor; and / or when the refrigerant leakage rate is greater than the preset threshold, cutting off the refrigerant passage from the outdoor unit to the indoor unit, cutting off the refrigerant passage from the indoor unit to the compressor, and controlling all the indoor heat exchangers to be disconnected from the refrigerant circuit.

[0014] The present application provides an electronic device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is capable of calling and running the computer program to execute the above-mentioned control method for refrigerant leakage.

[0015] The present application provides a multi-connected air conditioner unit, including a controller configured to be capable of executing the above-mentioned control method for refrigerant leakage.

[0016] In the case of adopting the above technical solution and when the refrigerant leakage rate is slow, the present application can recover the refrigerant in the target indoor heat exchanger corresponding to the refrigerant leakage location to the outdoor unit, so as to reduce the refrigerant leakage amount and prevent potential safety hazards such as fire or explosion caused by excessive refrigerant leakage. In addition, the present application utilizes the original structure of the air-conditioning unit for refrigerant recovery, without the need to additionally add refrigerant recovery components as in the related art, resulting in less modification to the air-conditioning unit and being beneficial to cost reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present application will be described below with reference to the accompanying drawings. In the drawings:

[0018] Figure 1 is a schematic structural diagram of the air-conditioning unit provided by the present application;

[0019] Figure 2 is a main step flow chart of the control method provided by the present application;

[0020] Figure 3 is a detailed step flow chart of the control method provided by the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present application and are not intended to limit the protection scope of the present application. It should be noted that although the detailed steps of the method of the present application are described in detail below, without departing from the basic principle of the present application, those skilled in the art can combine, split, and change the order of the following steps. The technical solutions modified in this way do not change the basic concept of the present application and thus also fall within the protection scope of the present application.

[0022] It should be noted that in the description of the present application, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present application, "a plurality" means at least two.

[0023] Combined with Figure 1As shown in the figure, the air-conditioning unit includes an outdoor unit and multiple indoor units. Each indoor unit is provided with an indoor heat exchanger 1, and a stop valve 101 is provided at both the inlet end and the outlet end of each indoor heat exchanger 1. That is to say, a first stop valve is provided at the inlet end of the indoor heat exchanger 1, and a second stop valve is provided at the outlet end of the indoor heat exchanger 1. The outdoor unit is provided with an outdoor heat exchanger 2, a compressor 3, a four-way valve 4 and a gas-liquid separator 5. The outdoor heat exchanger 2 is connected to the four-way valve 4 and the indoor heat exchanger 1, and the gas-liquid separator 5 is connected to the suction end of the compressor 3 and the four-way valve 4. The air-conditioning unit further includes a liquid pipe 6, a liquid-side cut-off valve 7, a gas pipe 8 and a gas-side cut-off valve 9. The liquid pipe 6 communicates between the outdoor heat exchanger 2 and the indoor heat exchanger 1, the liquid-side cut-off valve 7 is provided between the liquid pipe 6 and the indoor heat exchanger 1, the gas pipe 8 communicates between the four-way valve 4 and the indoor heat exchanger 1, and the gas-side cut-off valve 9 is provided on the gas pipe 8.

[0024] Optionally, each indoor heat exchanger 1 is provided with a stop valve box, and the stop valve box integrates the above-mentioned first stop valve and the above-mentioned second stop valve. In this way, the layout is convenient.

[0025] Among them, the four-way valve 4 includes a first connection port, a second connection port, a third connection port and a fourth connection port. The first connection port communicates with the exhaust end of the compressor 3, the second connection port communicates with the gas pipe 8, the third connection port communicates with the gas-liquid separator 5, and the fourth connection port communicates with the outdoor heat exchanger 2. When the air-conditioning unit operates in the heating mode, the first connection port and the second connection port of the four-way valve 4 are communicated, and the third connection port and the fourth connection port of the four-way valve 4 are communicated; when the air-conditioning unit operates in the cooling mode, the first connection port and the fourth connection port of the four-way valve 4 are communicated, and the second connection port and the third connection port of the four-way valve 4 are communicated.

[0026] Figure 1 It is a schematic diagram of the refrigerant flow path when the air-conditioning unit is in the cooling mode. When the air-conditioning unit is in the cooling mode, the first connection port and the fourth connection port of the four-way valve 4 are communicated, and the second connection port and the third connection port of the four-way valve 4 are communicated. The refrigerant flows through the exhaust end of the compressor 3, the four-way valve 4, the outdoor heat exchanger 2, the liquid pipe 6, the indoor heat exchanger 1, the gas pipe 8, the four-way valve 4, the gas-liquid separator 5 in sequence, and finally returns to the suction end of the compressor 3. When the air-conditioning unit is in the heating mode, the first connection port and the second connection port of the four-way valve 4 are communicated, and the third connection port and the fourth connection port of the four-way valve 4 are communicated. The refrigerant flows through the exhaust end of the compressor 3, the four-way valve 4, the gas pipe 8, the indoor heat exchanger 1, the liquid pipe 6, the outdoor heat exchanger 2, the four-way valve 4, the gas-liquid separator 5 in sequence, and finally returns to the suction end of the compressor 3.

[0027] The present application provides a method for controlling refrigerant leakage, which is applied to the above-mentioned air-conditioning unit, in combination with Figure 2 As shown in the figure, the control method provided by the present application includes:

[0028] S101, Obtain the refrigerant leakage rate.

[0029] For example, at the initial moment, the refrigerant concentration in the air is detected as the first concentration c1. After an interval of time Δt, the refrigerant concentration in the air is detected as the second concentration c2. Based on the first concentration c1, the second concentration c2, and the time interval Δt, the refrigerant leakage rate can be calculated, and the refrigerant leakage rate is (c2 - c1) / Δt.

[0030] S102, Determine the heat exchanger of the indoor unit where refrigerant leakage occurs as the target indoor heat exchanger.

[0031] For example, the air conditioner unit includes indoor unit A, indoor unit B, and indoor unit C. If refrigerant leaks from indoor unit A, then the heat exchanger of indoor unit A is identified as the target indoor heat exchanger. If refrigerant leaks from indoor unit A and C, then the heat exchangers of indoor unit A and C are identified as the target indoor heat exchangers.

[0032] Optionally, each indoor unit of the air conditioner unit is provided with a refrigerant concentration detection device for detecting the refrigerant concentration in the air, and the refrigerant concentration detection device is used to monitor the refrigerant leakage situation of each indoor unit in real time.

[0033] S103, When the refrigerant leakage rate is less than or equal to a preset threshold, control the operating state of the air conditioner unit so that the refrigerant in the target indoor heat exchanger is recovered into the outdoor unit.

[0034] When the refrigerant leakage rate is less than or equal to the preset threshold, the refrigerant leakage rate is slow; if the refrigerant leakage rate is greater than the preset threshold, the refrigerant leakage rate is fast.

[0035] In the case of adopting the above technical solution, when the refrigerant leakage rate is slow, the present application can recover the refrigerant in the target indoor heat exchanger corresponding to the place where refrigerant leakage occurs into the outdoor unit. In this way, the refrigerant leakage amount can be reduced, and safety hazards such as fire or explosion caused by excessive refrigerant leakage can be prevented. In addition, the present application uses the original outdoor unit of the air conditioner unit to recover the refrigerant, without the need to additionally add refrigerant recovery components as in the related art, and the modification to the air conditioner unit is small, which is beneficial to reducing costs.

[0036] In some embodiments, as shown in Figure 3 the step of "control the operating state of the air conditioner unit so that the refrigerant in the target indoor heat exchanger is recovered into the outdoor unit" further includes:

[0037] S201, Control the indoor heat exchanger without leakage to disconnect from the refrigerant circuit.

[0038] S202, Control the air conditioner unit to switch to the cooling mode.

[0039] S203, cut off the refrigerant channel from the outdoor unit to the indoor unit.

[0040] S204, control the operation of the compressor to recover the refrigerant in the target indoor heat exchanger into the outdoor unit.

[0041] Cutting off the refrigerant channel from the outdoor unit to the indoor unit also cuts off the refrigerant source of the indoor unit. Without continuous refrigerant entering the indoor unit, there will be no more refrigerant leaking through the target indoor heat exchanger. At the same time, disconnecting the indoor heat exchanger without leakage from the refrigerant circuit can avoid the refrigerant in the indoor heat exchanger without leakage affecting the refrigerant recovery speed in the target heat exchanger. At this time, the air conditioner unit operates in the cooling mode, and the operation of the compressor can quickly transfer the remaining refrigerant in the target heat exchanger to the outdoor unit. After the refrigerant is transferred, cut off the refrigerant channel from the indoor unit to the outdoor unit, and the refrigerant remains in the indoor heat exchanger without leakage and the outdoor unit. This can reduce the refrigerant leakage, prevent potential safety hazards such as fire or explosion caused by excessive refrigerant leakage, and at the same time can recover the refrigerant, save costs, and reduce environmental pollution.

[0042] Among them, the order of steps S201 to S203 can be adjusted arbitrarily, and the above effects can be achieved.

[0043] In some embodiments, the step of "controlling the indoor heat exchanger without leakage to be disconnected from the refrigerant circuit" further includes: controlling all the shut-off valves of the indoor heat exchanger without leakage to be closed. Closing all the shut-off valves of the indoor heat exchanger without leakage can seal the refrigerant in the indoor heat exchanger without leakage and avoid the refrigerant in the indoor heat exchanger without leakage being recovered by the compressor into the outdoor unit to interfere with the refrigerant recovery speed in the target indoor heat exchanger.

[0044] A first shut-off valve is provided at the inlet end of the indoor heat exchanger, and a second shut-off valve is provided at the outlet end of the indoor heat exchanger. Controlling all the shut-off valves of the indoor heat exchanger without leakage to be closed means closing both the first shut-off valve and the second shut-off valve of the indoor heat exchanger without leakage.

[0045] In some embodiments, the step of "cutting off the refrigerant channel from the outdoor unit to the indoor unit" further includes: controlling the liquid-side cut-off valve to close. By closing the liquid-side cut-off valve, the refrigerant channel from the outdoor unit to the indoor unit can be cut off, which also cuts off the refrigerant source of the indoor unit. Without continuous refrigerant entering the indoor unit, it is convenient for the refrigerant in the target indoor heat exchanger to be transferred to the outdoor unit, and at the same time, there will be no more refrigerant leaking through the target indoor heat exchanger.

[0046] In some embodiments, the step of "recovering the refrigerant in the target indoor heat exchanger into the outdoor unit" further includes: recovering the refrigerant in the target indoor heat exchanger into the outdoor heat exchanger, the liquid pipe and the gas-liquid separator. At this time, the air-conditioning unit is in the cooling mode, the liquid-side cut-off valve is closed, and the cut-off valves of the indoor heat exchangers without leakage are all closed. Under the action of the compressor, the refrigerant in the target indoor heat exchanger flows out and successively passes through the gas pipe, the four-way valve, the gas-liquid separator, the suction end of the compressor, the outdoor heat exchanger and the liquid pipe, and finally is stored in the gas-liquid separator, the outdoor heat exchanger and the liquid pipe. The liquid pipe of the air-conditioning unit is relatively long and can store a relatively large amount of refrigerant.

[0047] In some embodiments, the control method further includes: monitoring the liquid level height of the gas-liquid separator. When the liquid level height is greater than or equal to the height threshold, controlling the air-conditioning unit to stop recovering the refrigerant in the target indoor heat exchanger. When the liquid level height is less than the height threshold, controlling the operation of the air-conditioning unit according to the pressure ratio of the compressor. During the refrigerant recovery process, the refrigerant will enter the gas-liquid separator. If the liquid level height in the gas-liquid separator is too high, when the compressor starts next time, the liquid refrigerant in the gas-liquid separator will enter the compressor, causing liquid slugging damage to the compressor. By monitoring the liquid level height of the gas-liquid separator and controlling the air-conditioning unit to stop recovering the refrigerant in the target indoor heat exchanger when the liquid level height is greater than or equal to the height threshold, compressor damage can be avoided.

[0048] Optionally, a liquid level sensor is arranged in the gas-liquid separator to detect the liquid level height of the gas-liquid separator.

[0049] In some embodiments, the step of "when the liquid level height is less than the height threshold, controlling the operation of the air-conditioning unit according to the pressure ratio of the compressor" further includes: when the pressure ratio is greater than or equal to the pressure ratio threshold, controlling the air-conditioning unit to stop recovering the refrigerant in the target indoor heat exchanger. The pressure ratio of the compressor is equal to the ratio of the high-pressure pressure of the compressor to the low-pressure pressure of the compressor. During the refrigerant recovery process, the compressor transfers the refrigerant at the suction end to the exhaust end, the high-pressure pressure of the compressor increases, and the low-pressure pressure decreases. If the pressure ratio of the compressor is greater than or equal to the pressure ratio threshold, the compressor will be damaged. By controlling the air-conditioning unit to stop recovering the refrigerant in the target indoor heat exchanger when the pressure ratio of the compressor is greater than or equal to the pressure ratio threshold, compressor damage can be avoided.

[0050] In some embodiments, after the air-conditioning unit stops recovering the refrigerant, the control method further includes: cutting off the refrigerant channel from the indoor unit to the compressor. Cutting off the refrigerant channel between the indoor unit and the compressor can prevent the refrigerant from entering the target indoor heat exchanger and leaking into the room.

[0051] Cutting off the refrigerant passage from the indoor unit to the compressor means closing the gas-side cut-off valve. This can prevent the refrigerant on the side of the gas-side cut-off valve away from the indoor heat exchanger from entering the target indoor heat exchanger and leaking into the room.

[0052] The air-conditioning unit stops recovering refrigerant in at least the following situations: the refrigerant in the target indoor heat exchanger has been completely recovered; the liquid level height of the gas-liquid separator is less than the height threshold; the compression ratio of the compressor is greater than or equal to the compression ratio threshold.

[0053] In some embodiments, when the refrigerant leakage rate is greater than the preset threshold, cut off the refrigerant passage from the outdoor unit to the indoor unit, cut off the refrigerant passage from the indoor unit to the compressor, and control all indoor heat exchangers to be disconnected from the refrigerant circuit. At this time, the refrigerant leakage rate is relatively fast, and there is not enough time to recover the refrigerant in the target indoor heat exchanger. Cut off all refrigerant passages to prevent the refrigerant from flowing into the target indoor heat exchanger and leaking, so as to minimize the refrigerant leakage amount as much as possible.

[0054] Cutting off the refrigerant passage from the outdoor unit to the indoor unit means controlling the liquid-side cut-off valve to close; cutting off the refrigerant passage from the indoor unit to the compressor means closing the gas-side cut-off valve; controlling all indoor heat exchangers to be disconnected from the refrigerant circuit means closing the stop valves at the inlet and outlet ends of all indoor heat exchangers.

[0055] This application provides an electronic device. The electronic device includes a memory and a processor. A computer program is stored in the memory, and the processor can call and run the computer program to execute the above-mentioned refrigerant leakage control method. Optionally, the device may further include a communication interface and a bus. Among them, the processor, the communication interface, and the memory can complete communication with each other through the bus. The communication interface can be used for information transmission. The processor can call the logical instructions in the memory to execute the refrigerant leakage control method in the above embodiments.

[0056] This application provides an air-conditioning unit. The air-conditioning unit includes a controller configured to be able to execute the above-mentioned refrigerant leakage control method.

[0057] This application provides a computer-readable storage medium. A computer program is stored in the computer-readable storage medium. When the computer program runs, it executes the above-mentioned refrigerant leakage control method.

[0058] The above-mentioned computer-readable storage medium can be a transient computer-readable storage medium or a non-transient computer-readable storage medium.

[0059] This application provides an electronic device. The electronic device includes a memory and a processor. A computer program is stored in the memory, and the processor can call and run the computer program to execute the above-mentioned refrigerant leakage control method.

[0060] In addition, when the logic instructions in the above-mentioned memory are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.

[0061] As a computer-readable storage medium, the memory can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the methods in the embodiments of the present patent application. The processor executes functional applications and data processing by running the program instructions / modules stored in the memory, that is, to implement the control method for refrigerant leakage in the above embodiments.

[0062] The memory may include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function. The data storage area can store data created according to the use of the terminal device, etc. In addition, the memory may include high-speed random access memory and may also include non-volatile memory.

[0063] The technical solution of the embodiment of the present application can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method of the embodiment of the present application. The foregoing storage medium may be a non-transitory storage medium, including: various media such as USB flash drives, mobile hard disks, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes, or may also be a transitory storage medium.

[0064] Although the steps are described in the above order in the above embodiments, those skilled in the art can understand that in order to achieve the effects of this embodiment, different steps do not have to be executed in such an order. They can be executed simultaneously (in parallel) or in a reversed order, and these simple changes are all within the protection scope of the present application.

[0065] So far, the technical solution of the present application has been described in combination with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principle of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present application.

Claims

1. A control method for refrigerant leakage, which is applied to an air conditioner unit, characterized in that, The air conditioner unit includes an indoor unit and an outdoor unit, and the indoor unit is provided with an indoor heat exchanger; When refrigerant leakage occurs in the indoor unit, the control method includes: Obtaining the refrigerant leakage speed; Determining the heat exchanger of the indoor unit where refrigerant leakage occurs as the target indoor heat exchanger; When the refrigerant leakage speed is less than or equal to a preset threshold, controlling the operating state of the air conditioner unit to recover the refrigerant in the target indoor heat exchanger into the outdoor unit.

2. The control method according to claim 1, wherein The outdoor unit is provided with a compressor, and the step of "controlling the operating state of the air conditioner unit to recover the refrigerant in the target indoor heat exchanger into the outdoor unit" further includes: Controlling the indoor heat exchangers without leakage to disconnect from the refrigerant circuit; Controlling the air conditioner unit to switch to the cooling mode; Cutting off the refrigerant channel from the outdoor unit to the indoor unit; Controlling the compressor to operate so that the refrigerant in the target indoor heat exchanger is recovered into the outdoor unit.

3. The control method according to claim 2, wherein Cut-off valves are provided at both the inlet end and the outlet end of each indoor heat exchanger; The step of "controlling the indoor heat exchangers without leakage to disconnect from the refrigerant circuit" further includes: Controlling all the cut-off valves of the indoor heat exchangers without leakage to close.

4. The control method according to claim 2, characterized in that, The indoor unit includes an indoor heat exchanger, and the outdoor unit includes an outdoor heat exchanger; the air conditioner unit further includes: a liquid pipe communicating between the outdoor heat exchanger and the indoor heat exchanger; a liquid-side cut-off valve provided between the liquid pipe and the indoor heat exchanger; The step of "cutting off the refrigerant channel from the outdoor unit to the indoor unit" further includes: Controlling the liquid-side cut-off valve to close.

5. The control method according to claim 4, characterized in that, The outdoor unit further includes a gas-liquid separator, and the gas-liquid separator is provided at the suction end of the compressor; The step of "recovering the refrigerant in the target indoor heat exchanger into the outdoor unit" further includes: Recovering the refrigerant in the target indoor heat exchanger into the outdoor heat exchanger, the liquid pipe and the gas-liquid separator.

6. The control method according to claim 5, characterized in that, The control method further includes: Monitoring the liquid level height of the gas-liquid separator; When the liquid level height is greater than or equal to the height threshold, controlling the air conditioner unit to stop recovering the refrigerant in the target indoor heat exchanger; When the liquid level height is less than the height threshold, controlling the operation of the air conditioner unit according to the compression ratio of the compressor.

7. The control method according to claim 6, wherein The step of "when the liquid level height is less than the height threshold, controlling the operation of the air conditioner unit according to the compression ratio of the compressor" further includes: When the compression ratio is greater than or equal to the compression ratio threshold, controlling the air conditioner unit to stop recovering the refrigerant in the target indoor heat exchanger.

8. The control method according to any one of claims 2 to 7, characterized in that After the air conditioner unit stops recovering refrigerant, the control method further includes: cutting off the refrigerant channel from the indoor unit to the compressor; and / or When the refrigerant leakage speed is greater than the preset threshold, cutting off the refrigerant channel from the outdoor unit to the indoor unit, cutting off the refrigerant channel from the indoor unit to the compressor, and controlling all the indoor heat exchangers to disconnect from the refrigerant circuit.

9. An electronic device, comprising a memory and a processor, characterized in that, A computer program is stored in the memory, and the processor is capable of calling and running the computer program to execute the control method for refrigerant leakage according to any one of claims 1 to 8.

10. A multi-connected air conditioner unit, including a controller, characterized in that, The controller is configured to be capable of executing the control method for refrigerant leakage according to any one of claims 1 to 8.

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