Refrigerant leakage detection device, air conditioner, refrigerant leakage detection method, and medium

Abstract

The application provides a refrigerant leakage detection device, an air conditioner, a refrigerant leakage detection method and a medium. The device comprises a first refrigerant pipe, a second refrigerant pipe, a third refrigerant pipe and a throttling device. An inlet of the first refrigerant pipe is connected to an outdoor unit, and an outlet thereof is connected to an indoor unit. An inlet of the second refrigerant pipe is connected to the indoor unit, and an outlet thereof is connected to the outdoor unit. An inlet of the third refrigerant pipe is connected to one end of the first refrigerant pipe close to the indoor unit, and an outlet thereof is connected to the second refrigerant pipe. The refrigerant in the third refrigerant pipe is used for heat exchange with the refrigerant in the first refrigerant pipe. The throttling device is connected to the third refrigerant pipe, and is used for throttling the refrigerant flowing into the third refrigerant pipe. The throttling device and the third refrigerant pipe are additionally arranged in the embodiment of the application to enhance the supercooling degree of the refrigerant, so that the refrigerant leakage state can be detected by detecting the supercooling degree enhancement of the refrigerant. The refrigerant leakage detection can be realized without increasing external detection devices, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to a refrigerant leakage detection device, an air conditioner, a refrigerant leakage detection method and a medium. BACKGROUND

[0002] In related technologies, R32 refrigerant is a new environmentally friendly refrigerant with lower global warming potential and higher energy efficiency. For existing R32 detection systems, it is usually necessary to additionally increase external detection devices to detect the refrigerant leakage concentration in the external environment to evaluate the running state of the whole machine, which is costly, and the user conditions may not be able to meet the conditions of installing additional external detection devices, has low universality, and also cannot guarantee that the third-party user will install the detection components according to the specification. In addition, the existing R32 detection system can usually only detect the concentration of a certain area, which has poor accuracy, so it is difficult to well evaluate and monitor the running state of the whole machine. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a refrigerant leakage detection device, an air conditioner, a refrigerant leakage detection method and a medium, which aims to improve the accuracy of detection, reduce the cost, and improve the universality.

[0004] In a first aspect, the embodiments of the present application provide a refrigerant leakage detection device, comprising:

[0005] A first refrigerant pipe, an inlet of the first refrigerant pipe being connected to an outdoor unit, and an outlet of the first refrigerant pipe being connected to an indoor unit;

[0006] A second refrigerant pipe, an inlet of the second refrigerant pipe being connected to the indoor unit, and an outlet of the second refrigerant pipe being connected to the outdoor unit;

[0007] A third refrigerant pipe, an inlet of the third refrigerant pipe being connected to one end of the first refrigerant pipe close to the indoor unit, and an outlet of the third refrigerant pipe being connected to the second refrigerant pipe, and refrigerant in the third refrigerant pipe being used for heat exchange with refrigerant in the first refrigerant pipe;

[0008] A throttling device connected to the third refrigerant pipe, the throttling device being used for throttling refrigerant flowing into the third refrigerant pipe.

[0009] According to some embodiments of the present application, the third refrigerant pipe is sleeved on the surface of the first refrigerant pipe, and the flow direction of the refrigerant in the third refrigerant pipe is opposite to the flow direction of the refrigerant in the first refrigerant pipe.

[0010] According to some embodiments of the present application, the throttling device is arranged inside the third refrigerant pipe, or the throttling device is arranged at a position on the inlet side of the third refrigerant pipe.

[0011] In a second aspect, the embodiments of the present application provide an air conditioner, comprising an outdoor unit, an indoor unit and the refrigerant leakage detection device as described in the first aspect above, a refrigerant outlet of the outdoor unit is connected to a refrigerant inlet of the indoor unit through the first refrigerant pipe, and a refrigerant outlet of the indoor unit is connected to a refrigerant inlet of the outdoor unit through the second refrigerant pipe.

[0012] According to some embodiments of the present application, the outdoor unit is provided with a compressor, a condenser and a subcooling pipe, an exhaust port of the compressor is connected to an inlet of the first refrigerant pipe through the condenser and the subcooling pipe in sequence.

[0013] In a third aspect, the embodiments of the present application provide a refrigerant leakage detection method, applied to the air conditioner as described in the second aspect above, and the refrigerant leakage detection method comprises:

[0014] obtaining an exhaust temperature and a suction temperature of the compressor, a first refrigerant temperature flowing through the subcooling pipe, and a refrigerant subcooling degree on an inlet side of the indoor unit;

[0015] determining a refrigerant leakage state of the air conditioner according to the exhaust temperature, the suction temperature, the first refrigerant temperature and the refrigerant subcooling degree.

[0016] According to some embodiments of the present application, the determination of the refrigerant leakage state of the air conditioner according to the exhaust temperature, the suction temperature, the first refrigerant temperature and the refrigerant subcooling degree comprises:

[0017] calculating a first difference value of the exhaust temperature and the suction temperature;

[0018] calculating a second difference value of the first refrigerant temperature and the exhaust temperature;

[0019] in a case where the first difference value is greater than a first preset value, the second difference value is greater than a second preset value, and the refrigerant subcooling degree is less than a preset subcooling degree, it is determined that the air conditioner has a refrigerant leakage.

[0020] According to some embodiments of the present application, the exhaust temperature is obtained in the following manner:

[0021] obtaining an exhaust pressure of the compressor;

[0022] determining the exhaust temperature of the compressor according to the exhaust pressure.

[0023] According to some embodiments of the present application, the refrigerant subcooling degree is obtained in the following manner:

[0024] obtaining a refrigerant pressure and a second refrigerant temperature on the inlet side of the indoor unit;

[0025] determining a third refrigerant temperature according to the refrigerant pressure;

[0026] determining a refrigerant supercooling degree at an inlet side of the indoor unit according to the second refrigerant temperature and the third refrigerant temperature.

[0027] According to some embodiments of the present application, after the first difference between the discharge temperature and the suction temperature is calculated, the method further comprises:

[0028] When the first difference is less than or equal to the first preset value, it is determined that the air conditioner has a fault, and the air conditioner is controlled to stop running.

[0029] According to some embodiments of the present application, after the second difference between the first refrigerant temperature and the discharge temperature is calculated, the method further comprises:

[0030] When the second difference is less than or equal to the second preset value, the refrigerant in the first refrigerant pipe is controlled to stop flowing to the third refrigerant pipe, and an alarm information is generated.

[0031] According to some embodiments of the present application, after the refrigerant supercooling degree at the inlet side of the indoor unit is determined according to the second refrigerant temperature and the third refrigerant temperature, the method further comprises:

[0032] When the refrigerant supercooling degree is greater than or equal to the preset supercooling degree, it is determined that the air conditioner is running normally.

[0033] According to some embodiments of the present application, after it is determined that the air conditioner has a refrigerant leakage, the method further comprises:

[0034] The compressor is controlled to stop running, and an alarm information for prompting the refrigerant leakage is generated.

[0035] In a fourth aspect, embodiments of the present application provide a controller, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to perform the refrigerant leakage detection method in the third aspect.

[0036] In a fifth aspect, embodiments of the present application provide a computer readable storage medium, which stores computer executable instructions for performing the refrigerant leakage detection method in the third aspect.

[0037] According to the technical scheme of the embodiment of the present application, the following technical effects are included but not limited to: the refrigerant leakage detection device of the embodiment of the present application comprises a first refrigerant pipe, a second refrigerant pipe, a third refrigerant pipe and a throttling device, the inlet of the first refrigerant pipe is connected to the outdoor unit, and the outlet is connected to the indoor unit; the inlet of the second refrigerant pipe is connected to the indoor unit, and the outlet is connected to the outdoor unit; the inlet of the third refrigerant pipe is connected to one end of the first refrigerant pipe close to the indoor unit, and the outlet is connected to the second refrigerant pipe, and the refrigerant in the third refrigerant pipe is used for heat exchange with the refrigerant in the first refrigerant pipe; the throttling device is connected to the third refrigerant pipe, and is used for throttling the refrigerant flowing into the third refrigerant pipe. The embodiment of the present application adds the throttling device and the third refrigerant pipe to keep the refrigerant entering the indoor unit from the first refrigerant pipe at a certain supercooling degree to control the refrigerant fluid state, and if the refrigerant of the whole machine leaks, the supercooling state of the refrigerant is automatically insufficient, so the embodiment of the present application can detect the refrigerant leakage state based on this. Therefore, the embodiment of the present application does not need to increase external detection devices, reduces the cost, and does not need to consider whether the installation is standard; and does not need to consider the use environment of the air conditioner, and has strong universality; in addition, the embodiment of the present application detects the refrigerant inside the air conditioner, has strong reliability, high detection accuracy, and can well evaluate and monitor the running state of the whole machine.

[0038] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings are included to provide a further understanding of the technical scheme of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical scheme of the present application, and do not constitute a limitation on the technical scheme of the present application.

[0040] Figure 1 is a structural schematic diagram of a refrigerant leakage detection device provided by an embodiment of the present application;

[0041] Figure 2 is a structural schematic diagram of an air conditioner applying the refrigerant leakage detection device provided by an embodiment of the present application;

[0042] Figure 3 is a flow chart of a refrigerant detection method applied to an air conditioner provided by an embodiment of the present application;

[0043] Figure 4 is Figure 3 is a sub-step schematic diagram of step S302 in the method;

[0044] Figure 5 is Figure 3 is a sub-step schematic diagram of step S301 in the method;

[0045] Figure 6 is Figure 3 Another sub-step schematic diagram of step S301 in the method is shown in

[0046] Figure 7 is Figure 3 Another sub-step schematic diagram of step S302 in the method is shown in

[0047] Figure 8 is Figure 3 Another sub-step schematic diagram of step S302 in the method is shown in

[0048] Figure 9 is a step flow chart of the refrigerant leakage detection method provided by another embodiment of the present application;

[0049] Figure 10 is Figure 3 Another sub-step schematic diagram of step S302 in the method is shown in

[0050] Figure 11 is a step flow chart of the refrigerant leakage detection method provided by another embodiment of the present application;

[0051] Figure 12 is a structure schematic diagram of the controller for executing the detection method of the refrigerant leakage detection device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0052] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary, only for explaining the present application, and cannot be understood as a limitation to the present application.

[0053] In the description of the present application, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the present application.

[0054] In the description of the present application, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. is not included in the number, above, below, etc. is understood to include the number. If it is described as first, second, only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0055] In the description of the present application, unless otherwise explicitly defined, the words such as arrangement, installation, connection, etc. should be understood broadly, and the person skilled in the art can determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0056] In the related art, R32 refrigerant is a new environmentally friendly refrigerant with lower global warming potential and higher energy efficiency. For the existing R32 detection system, it is usually necessary to additionally increase an external detection device to detect the refrigerant leakage concentration in the external environment to evaluate the running state of the whole machine, which is high in cost, and the user conditions may not be able to meet the conditions of installing an additional external detection device, is low in universality, and also cannot guarantee that the third-party user will install the detection components according to the specification. In addition, the existing R32 detection system can usually only detect the concentration in a certain area, and is poor in accuracy, so it is difficult to well evaluate and monitor the running state of the whole machine.

[0057] Based on the above situation, the present application embodiment proposes a refrigerant leakage detection device and a detection method thereof, an air conditioner and a storage medium, aiming to improve the detection accuracy, reduce the cost, and improve the universality.

[0058] The various embodiments of the refrigerant leakage detection device of the present application will be further described below in combination with the drawings.

[0059] As shown in Figure 1 , Figure 1 is a structural schematic diagram of the refrigerant leakage detection device provided by an embodiment of the present application. The refrigerant leakage detection device 1 of the present application embodiment includes but is not limited to a first refrigerant pipe 10, a second refrigerant pipe 20, a third refrigerant pipe 30 and a throttling device 40.

[0060] The inlet of the first refrigerant pipe 10 is communicated with an outdoor unit, and the outlet is used to be communicated to an indoor unit. The inlet of the second refrigerant pipe 20 is used to be communicated to the indoor unit, and the outlet is used to be communicated to the outdoor unit. The inlet of the third refrigerant pipe 30 is communicated with one end of the first refrigerant pipe 10 close to the indoor unit, and the outlet is communicated to the second refrigerant pipe 20. The refrigerant in the third refrigerant pipe 30 is used to exchange heat with the refrigerant in the first refrigerant pipe 10. The throttling device 40 is connected to the third refrigerant pipe 30, and the throttling device 40 is used to throttle the refrigerant flowing into the third refrigerant pipe 30.

[0061] It should be understood that the specific arrangement of the third refrigerant pipe 30 is various, for example, the third refrigerant pipe 30 is arranged adjacent to the first refrigerant pipe 10; for another example, the third refrigerant pipe 30 is arranged around the first refrigerant pipe 10, and the person skilled in the art can determine the specific arrangement of the third refrigerant pipe 30 according to the actual needs, and the present application embodiment does not limit it.

[0062] It should be understood that the flow direction of the refrigerant in the third refrigerant pipe 30 is specifically various, and those skilled in the art can determine the specific flow direction of the refrigerant in the third refrigerant pipe 30 according to actual conditions to improve the supercooling degree of the refrigerant in the first refrigerant pipe 10, and the embodiments of the present application do not limit this.

[0063] For example, the flow direction of the refrigerant in the third refrigerant pipe 30 is the same as that of the refrigerant in the first refrigerant pipe 10, or the flow direction of the refrigerant in the third refrigerant pipe 30 is opposite to that of the refrigerant in the first refrigerant pipe 10.

[0064] Specifically, as shown in Figure 1 , the direction indicated by the arrow is the refrigerant flow direction of the air conditioner, and the outdoor unit and the indoor unit are not shown in Figure 1 . The refrigerant is pressurized and heat-exchanged through the compressor and the condenser included in the outdoor unit to improve the supercooling degree of the refrigerant, and flows to the indoor unit through the first refrigerant pipe 10 to absorb heat. After the refrigerant in the indoor unit absorbs heat, it flows back to the outdoor unit through the second refrigerant pipe 20 to complete a cycle. In this cycle, since the third refrigerant pipe 30 is connected to the end of the first refrigerant pipe 10 close to the indoor unit, part of the refrigerant in the first refrigerant pipe 10 will separate from the third refrigerant pipe 30, exchange heat with the refrigerant in the first refrigerant pipe 10, and improve the supercooling degree of the refrigerant in the first refrigerant pipe 10.

[0065] The throttling device 40 has a throttling effect and depressurizes the refrigerant in the first refrigerant pipe 10. Since there is a large pressure difference between the refrigerant before and after the throttling device 40, after the refrigerant flows out of the throttling device 40, the pressure of the refrigerant is lower than that of the refrigerant in the first refrigerant pipe 10, causing the first refrigerant pipe 10 to instantaneously flash gas, and part of the refrigerant vaporizes into refrigerant gas. Since liquid changes to gas requires heat absorption, heat exchange occurs between the refrigerant in the first refrigerant pipe 10 during the flashing process, which again improves the supercooling degree of the refrigerant in the first refrigerant pipe 10 and improves the refrigeration effect of the refrigerant in the first refrigerant pipe 10.

[0066] Under the action of the throttling device 40, the heat exchange capacity of the refrigerant in the third refrigerant pipe 30 to the first refrigerant pipe 10 is limited. After the third refrigerant pipe 30 increases the supercooling degree of the first refrigerant pipe 10 to a certain value, the heat exchange balance is reached, and the temperature change is small.

[0067] Based on this heat exchange process, when refrigerant leakage occurs in the entire machine, the refrigerant pressure will decrease due to leakage, so that the pressure of the refrigerant before and after throttling will be affected. At this time, the pressure of the refrigerant in the first refrigerant pipe 10 entering the third refrigerant pipe 30 will decrease, causing the pressure difference between the refrigerant before and after the throttling device 40 to be smaller than before, and reducing the heat exchange effect of the refrigerant in the first refrigerant pipe 10.

[0068] The change in the heat exchange balance between the third refrigerant pipe 30 and the first refrigerant pipe 10 causes the supercooling degree of the refrigerant in the first refrigerant pipe 10 to be insufficient, and the supercooling degree of the refrigerant can be reflected by temperature, so that the refrigerant leakage detection can be realized by detecting the temperature of the end of the first refrigerant pipe 10 close to the indoor unit, without the need to increase external detection devices.

[0069] In an embodiment, the third refrigerant pipe 30 is sleeved on the surface of the first refrigerant pipe 10, and the flow direction of the refrigerant in the third refrigerant pipe 30 is opposite to that in the first refrigerant pipe 10.

[0070] As shown in the embodiment of Figure 1 , the third refrigerant pipe 30 is sleeved on the surface of the first refrigerant pipe 10, which lengthens the distance of the refrigerant in the third refrigerant pipe 30 flowing back to the second refrigerant pipe 20, and improves the utilization rate of the refrigerant in the third refrigerant pipe 30.

[0071] Specifically, the flow directions of the refrigerants in the two refrigerant pipes are opposite, and the refrigerant in the third refrigerant pipe 30 starts from the inlet and absorbs heat in the first refrigerant pipe 10 in the form of liquid to change into the form of gas and flow to the second refrigerant pipe 20.

[0072] Such a setting mode makes the refrigerant pass through the position between the two ends of the third refrigerant pipe 30 completely, so that the refrigerant in the sleeved part of the first refrigerant pipe 10 can fully exchange heat with the refrigerant in the third refrigerant pipe 30, the supercooling degree of the first refrigerant pipe 10 as a whole is improved, and the heat exchange effect of the refrigerant in the third refrigerant pipe 30 is effectively utilized.

[0073] It should be understood that the position of the throttling device 40 in the embodiments of the present application is various.

[0074] In an embodiment, the throttling device 40 is arranged inside the third refrigerant pipe 30, or the throttling device 40 is arranged at the inlet side of the third refrigerant pipe 30.

[0075] For the former part of this embodiment, the refrigerant at the inlet side of the throttling device 40 remains in a liquid state, and since the refrigerant at the inlet side is branched from the first refrigerant pipe 10, the heat exchange effect of this part of the refrigerant on the first refrigerant pipe 10 is not strong, while the refrigerant at the outlet side of the throttling device 40 absorbs heat from the refrigerant in the first refrigerant pipe 10 at the outlet side due to flashing, so that the supercooling degree of the refrigerant between the inlet of the first refrigerant pipe 10 and the outlet side of the throttling device 40 in the first refrigerant pipe 10 is improved, and the supercooling degree of the refrigerant at the outlet side of the first refrigerant pipe 10 is also improved; the heat exchange effect of the refrigerant at the inlet side of the throttling device 40 on the first refrigerant pipe 10 is also improved, so as to form a positive cycle of heat exchange and direct heat exchange balance.

[0076] For the latter part of this embodiment, such as Figure 1 As shown, the outlet side of the throttling device 40 is close to the inlet side of the third refrigerant pipe 30, so that the refrigerant branched from the first refrigerant pipe 10 can enter the throttling device 40 as soon as it enters the third refrigerant pipe 30, which can quickly increase the subcooling of the refrigerant at the outlet of the first refrigerant pipe 10.

[0077] In one embodiment, the throttling device 40 can be a capillary tube or a throttling valve. When the throttling device 40 is a capillary tube, its inlet can be connected to the first refrigerant pipe 10, pass through the third refrigerant pipe 30, and finally connect to the second refrigerant pipe 20. Alternatively, when the throttling device 40 is a throttling valve, the throttling valve can be as follows: Figure 1 The device shown is installed at the inlet of the third refrigerant pipe 30, or it can be installed inside the third refrigerant pipe 30. This application embodiment does not specifically limit this.

[0078] This embodiment adds a throttling device 40 and a third refrigerant pipe 30 to maintain a certain degree of subcooling for the refrigerant entering the indoor unit from the first refrigerant pipe 10, thereby controlling the refrigerant fluid state. If refrigerant leakage occurs throughout the unit, it automatically results in insufficient subcooling. Therefore, this embodiment can detect refrigerant leakage based on this. Thus, this embodiment eliminates the need for external detection devices, reducing costs and eliminating concerns about installation specifications; it also eliminates the need to consider the air conditioner's operating environment, making it highly versatile; furthermore, this embodiment detects the refrigerant inside the air conditioner, ensuring high reliability and accuracy, and enabling effective evaluation and monitoring of the overall unit's operating status.

[0079] like Figure 2 As shown, Figure 2 This is a schematic diagram of an air conditioner using a refrigerant leak detection device according to an embodiment of this application. The air conditioner in this embodiment includes, but is not limited to, an outdoor unit 2, an indoor unit 3, and... Figure 1 The refrigerant leak detection device 1 shown is shown in the figure.

[0080] The refrigerant outlet of outdoor unit 2 is connected to the refrigerant inlet of indoor unit 3 through the first refrigerant pipe 10 of refrigerant leak detection device 1, and the refrigerant outlet of indoor unit 3 is connected to the refrigerant inlet of outdoor unit 2 through the second refrigerant pipe 20.

[0081] Because the air conditioner uses the refrigerant leak detection device 1, the refrigerant flowing out of the refrigerant outlet of the outdoor unit 2 can improve the subcooling of the refrigerant through the third refrigerant pipe 30 and the throttling device 40 in the refrigerant leak detection device 1, thereby improving the cooling effect of the air conditioner. In addition, the refrigerant leak detection device 1 also provides a basis for detecting refrigerant leaks, so that the embodiment of this application can directly detect the refrigerant leak status and reduce costs.

[0082] In one embodiment, the outdoor unit 2 is provided with, but is not limited to, a compressor 21, a condenser 22 and a subcooled liquid pipe 23, and the exhaust port of the compressor 21 is connected to the inlet of the first refrigerant pipe 10 in sequence through the condenser 22 and the subcooled liquid pipe 23.

[0083] It should be understood that the subcooled liquid pipe 23 here is used to increase the subcooling degree of the refrigerant flowing out of the condenser outlet. The specific form of the subcooled liquid pipe 23 is diverse. For example, it can be an economizer, a plate heat exchanger, etc. Those skilled in the art can determine the specific form of the subcooled liquid pipe 23 according to the actual situation. This application embodiment does not limit this.

[0084] This embodiment of the application increases the subcooling of the refrigerant by reheating the refrigerant flowing out of the condenser 22, so that the refrigerant at the inlet of the first refrigerant pipe 10 maintains a certain subcooling, thereby improving the subcooling of the refrigerant in the first refrigerant pipe 10 by the refrigerant leakage detection device 1 and improving the cooling effect of the air conditioner.

[0085] Based on the overall structure of the refrigerant leakage detection device in the above embodiments, the following presents various embodiments of the detection method of the refrigerant leakage detection device of this application.

[0086] It should be noted that the steps of the detection method of the refrigerant leak detection device in this application correspond to the application scenario of the refrigerant leak detection device. That is, the steps of the detection method of the refrigerant leak detection device may be different in different application scenarios, as detailed below:

[0087] like Figure 3 As shown, Figure 3 This is a flowchart of a refrigerant detection method for an air conditioner according to an embodiment of this application. The detection method of this refrigerant leakage detection device may include, but is not limited to, steps S301 and S302.

[0088] Step S301: Obtain the compressor's discharge temperature and suction temperature, the temperature of the first refrigerant flowing through the cold liquid pipe, and the refrigerant subcooling degree at the inlet side of the indoor unit.

[0089] Step S302: Determine the refrigerant leakage status of the air conditioner based on the exhaust temperature, intake temperature, first refrigerant temperature, and refrigerant subcooling.

[0090] In an embodiment, due to the normal operation of the air conditioner, the temperature of the refrigerant gradually decreases along the direction from the outdoor unit to the indoor unit, when the system of the air conditioner is in a stable state, the temperature difference at each location is within a certain range, when the temperature difference exceeds a certain range, it proves that there is an abnormality at a certain location of the air conditioner, based on the working principle of the refrigerant leakage detection device 1, whether the refrigerant leaks can be determined according to the discharge temperature and suction temperature of the compressor, the first refrigerant temperature flowing through the subcooled liquid pipe, and the refrigerant supercooling degree at the inlet side of the indoor unit.

[0091] In the embodiment of the present application, the discharge temperature of the compressor 21 is used to represent the temperature of the gaseous refrigerant at the discharge port when the indoor unit 3 pressurizes and outputs the gaseous refrigerant backflowing to the discharge port, and the suction temperature is used to represent the temperature of the refrigerant at the suction port when the compressor 21 sucks in the temperature of the gaseous refrigerant backflowing from the second refrigerant pipe 20. For normal operating conditions, the compressor 21 will increase the temperature of the refrigerant, but due to the limited evaporation capacity of the compressor 21 to the refrigerant, when the compressor 21 is normally and stably operated, the discharge temperature must be higher than the suction temperature by a certain value, when the compressor 21 is not normally operated, the temperature difference between the discharge temperature and the suction temperature will be less than the minimum temperature difference when the compressor 21 is normally and stably operated, by detecting the discharge temperature and suction temperature of the compressor 21 and calculating the temperature difference therebetween, whether the system of the outdoor unit is normally operated can be determined.

[0092] In the embodiment of the present application, the first refrigerant temperature flowing through the subcooled liquid pipe refers to the temperature of the refrigerant backflowing from the heat exchange mechanism of the subcooled liquid pipe 23 to the compressor 21.

[0093] The gaseous refrigerant discharged from the discharge port of the compressor 21 is subjected to heat exchange by the condenser 22, so that the gaseous refrigerant is liquefied into liquid refrigerant, and the liquid refrigerant flowing out of the condenser 22 will flow into the subcooled liquid pipe 23 for the next heat exchange to improve the refrigeration effect. Due to the heat exchange mechanism of the subcooled liquid pipe 23 itself, the temperature of the gaseous refrigerant backflowing to the compressor 21 is lower than the discharge temperature of the compressor 21, so as to reduce the discharge temperature of the compressor 21 and improve the heat exchange efficiency and the refrigerant evaporation efficiency.

[0094] And because the condenser 22 always outputs liquid refrigerant, the temperature of the gaseous refrigerant backflowing from the subcooled liquid pipe 23 to the compressor 21 always cools the discharge port of the compressor 21 until the system is balanced, which also makes the first refrigerant temperature higher than the discharge temperature of the compressor 21. When the subcooled liquid pipe 23 is normally and stably operated, the first refrigerant temperature must be higher than the discharge temperature by a certain value.

[0095] When the compressor 21 is not normally operated, the temperature difference between the first refrigerant temperature and the discharge temperature will be less than the minimum temperature difference when the compressor 21 is normally and stably operated, by detecting the discharge temperature and the first refrigerant temperature of the compressor 21 and calculating the temperature difference therebetween, whether the subcooled control is normally operated can be determined.

[0096] In the embodiment, the refrigerant supercooling degree at the inlet side of the indoor unit refers to the supercooling degree of the refrigerant flowing out of the supercooling liquid pipe 23 passing through the refrigerant leakage detection device 1. The higher the supercooling degree, the better the refrigeration effect of the air conditioner. If the supercooling degree is lower than a certain degree, it indicates that there is a problem in the internal refrigeration system of the air conditioner. In the case where the system of the outdoor unit and the supercooling control are both normal, if the supercooling degree is lower than a certain degree, it can be determined that the air conditioner has a refrigerant leakage problem, which leads to insufficient supercooling degree. Thus, the refrigerant leakage state of the air conditioner can be determined.

[0097] It should be understood that the specific acquisition methods of the exhaust temperature, the suction temperature, and the first refrigerant temperature are various. For example, a pressure sensor is arranged at the corresponding pipeline or gas port to test the gas pressure, and the temperature is converted according to a preset pressure-temperature conversion table and the obtained gas pressure to obtain various types of temperature. For another example, a temperature sensor is arranged at the corresponding pipeline or gas port to directly measure the temperature at the position to obtain the temperature. Those skilled in the art can determine the specific acquisition methods of the exhaust temperature, the suction temperature, and the first refrigerant temperature according to the actual situation, and the embodiments of the present application do not limit the specific acquisition methods.

[0098] It should be understood that the specific acquisition methods of the refrigerant supercooling degree are various. For example, a pressure sensor and a temperature sensor are arranged at the inlet side of the indoor unit to determine the refrigerant supercooling degree according to the measured gas pressure and temperature value by referring to a preset pressure-temperature conversion table. For another example, the refrigerant supercooling degree is inversely proportional to the temperature, and a temperature sensor is arranged at the inlet side of the indoor unit to convert the temperature to obtain the refrigerant supercooling degree. Those skilled in the art can determine the specific acquisition methods of the refrigerant supercooling degree according to the actual situation, and the embodiments of the present application do not limit the specific acquisition methods.

[0099] As shown in FIG. 4, Figure 4 is a sub-step schematic diagram of step S302 in FIG. 3. In an embodiment, step S302 includes but is not limited to the following sub-steps. Figure 4 Figure 3 Step S401: calculating a first difference value of the exhaust temperature and the suction temperature.

[0100] Step S402: calculating a second difference value of the first refrigerant temperature and the exhaust temperature.

[0101] Step S402: calculating a second difference value of the first refrigerant temperature and the exhaust temperature.

[0102] Step S403: determining that the air conditioner has a refrigerant leakage in the case where the first difference value is greater than a first preset value, the second difference value is greater than a second preset value, and the refrigerant supercooling degree is less than a preset supercooling degree.

[0103] ​It should be understood that the first preset value herein is used to represent the minimum temperature difference between the discharge temperature and the suction temperature when the compressor 21 is in normal operation; and the second preset value herein is used to represent the minimum temperature difference between the first refrigerant temperature and the discharge temperature when the subcooling pipe 23 is in normal operation.

[0104] In this embodiment, the first difference being greater than the first preset value and the second difference being greater than the second preset value are prerequisites for judging the refrigerant leakage of the air conditioner. When at least one of the two prerequisites is not met, there is a problem with the outdoor unit, but the problem is not necessarily caused by the refrigerant leakage. When the system of the outdoor unit and / or the subcooling control is malfunctioning, the refrigerant subcooling degree will eventually be insufficient. This phenomenon is caused by the normal or malfunctioning operation of the system of the outdoor unit itself. The refrigerant subcooling degree of the refrigerant discharged from the outdoor unit is relatively low. Under the action of the refrigerant leakage detection device 1, the refrigerant cannot reach the normal subcooling degree regardless of how hard it tries. The refrigerant degree is systematically reduced. Simply judging whether the refrigerant subcooling degree is less than the preset subcooling degree cannot accurately determine whether the air conditioner has a refrigerant leakage. When the system of the outdoor unit and the subcooling control are in normal operation, if the refrigerant subcooling degree is less than the preset subcooling degree, it can be determined that the refrigerant of the air conditioner has a leakage.

[0105] It should be understood that the specific values of the first preset value, the second preset value, and the preset subcooling degree are various. Those skilled in the art can set the specific values of the first preset value, the second preset value, and the preset subcooling degree according to the actual situation, which is not limited in the present application.

[0106] As shown in Figure 5 , Figure 5 is Figure 3 a sub-step schematic diagram of step S301. In an embodiment, the way of obtaining the discharge temperature includes but is not limited to the following sub-steps.

[0107] Step S501, obtaining the discharge pressure of the compressor.

[0108] Step S502, determining the discharge temperature of the compressor according to the discharge pressure.

[0109] Specifically, since the compressor evaporates the liquid refrigerant to produce high-temperature and high-pressure gaseous refrigerant, the gaseous pressure is instantaneous. By measuring the discharge pressure of the compressor, the current instantaneous temperature change of the compressor can be reflected. Compared with temperature measurement, there is a time difference in heat conduction between gases and the heat sensing time required by the temperature sensor. Even if the time difference is small, the temperature instantaneousness of direct measurement is relatively low. In addition, by obtaining the discharge pressure of the compressor, the gaseous pressure of the compressor can be measured to detect whether there is a sealing problem, reducing the installation of sensors and reducing costs.

[0110] AsFigure 6 As shown, Figure 6 yes Figure 3 A schematic diagram of another sub-step in step S301. In one embodiment, the method of obtaining the refrigerant subcooling includes, but is not limited to, the following steps.

[0111] Step S601: Obtain the refrigerant pressure and the second refrigerant temperature on the inlet side of the indoor unit.

[0112] Step S602: Determine the temperature of the third refrigerant based on the refrigerant pressure.

[0113] Step S603: Determine the refrigerant subcooling on the inlet side of the indoor unit based on the second refrigerant temperature and the third refrigerant temperature.

[0114] Specifically, in actual operation, for a normally operating air conditioner, the air conditioner needs to maintain a certain refrigerant pressure on the inlet side of the subcooling indoor unit. However, the subcooling capacity of the air conditioner is limited, so the refrigerant pressure on the inlet side of the indoor unit 3 will fluctuate within a certain range depending on the operation of the system.

[0115] Because the compressor 21 pressurizes the refrigerant, the pressure at the inlet side of the indoor unit 3 is greater than atmospheric pressure. If there is a refrigerant leak, the gas pressure at the inlet side of the indoor unit 3 will decrease and fall below the normal range.

[0116] according to Figure 1 The principle of the provided refrigerant leak detection device 1 is that a decrease in pressure reduces the heat exchange capacity of the third refrigerant pipe 30 to the first refrigerant pipe 10. Based on this, the gas pressure can be converted into the third refrigerant temperature by measuring the refrigerant pressure at the inlet side of the indoor unit 3. The temperature difference between the second and third refrigerant temperatures reflects the refrigerant subcooling at the inlet side. The higher the subcooling, the lower the temperature difference. If the temperature difference exceeds a certain value, a refrigerant leak is present. The decrease in gas pressure caused by the refrigerant leak lowers the measured third refrigerant temperature, which in turn changes the temperature difference. The actual refrigerant temperature (corresponding to the second refrigerant temperature) will be higher than the third refrigerant temperature by a certain value. Therefore, a temperature difference threshold can be set to reflect the refrigerant subcooling. When the temperature difference is higher than the temperature difference threshold, it indicates that the refrigerant subcooling is below a certain level, thus determining that there is a refrigerant leak in the air conditioner.

[0117] like Figure 7 As shown, Figure 7 yes Figure 3 A schematic diagram of another sub-step of step S302. In one embodiment, after step S401, step S302 further includes, but is not limited to, the following sub-steps.

[0118] Step S701: When the first difference is less than or equal to the first preset value, it is determined that the air conditioner has a fault, and the air conditioner is controlled to stop.

[0119] It should be understood that when the first difference is less than or equal to the first preset value, that is, the temperature of the refrigerant discharged and / or drawn in by the compressor 21 does not meet the standard, and the faults of the air conditioner are varied, any situation may cause the refrigerant temperature to not meet the standard. For example, the compressor 21 may be faulty and unable to properly evaporate and vaporize the refrigerant; the inverter may be faulty and weaken the compressor 21's ability to evaporate and vaporize the refrigerant; or the indoor unit 3 may have a problem, resulting in a reduction in the amount of refrigerant returning, etc. Since the specific fault situation cannot be determined, in order to protect the normally operating parts of the air conditioner, the air conditioner is controlled to stop and wait for maintenance.

[0120] It should be understood that when the air conditioner is started, if the faulty part is not completely repaired and the refrigerant still cannot meet the requirements, the first difference will be less than or equal to the first preset value, and the air conditioner will execute step S701 until the faulty part is completely repaired.

[0121] like Figure 8 As shown, Figure 8 yes Figure 3 A schematic diagram of another sub-step of step S302. In one embodiment, after step S402, step S302 further includes, but is not limited to, the following sub-steps.

[0122] In step S801, when the second difference is less than or equal to the second preset value, the refrigerant in the first refrigerant pipe is controlled to stop flowing to the third refrigerant pipe, and an alarm message is generated.

[0123] Specifically, if the second difference is less than or equal to the second preset value, it indicates that the subcooling liquid pipe 23 is unstable, cannot achieve the normal subcooling control process, cannot increase the subcooling degree of the refrigerant discharged from the condenser, and thus reduces the cooling capacity of the indoor unit.

[0124] It should be understood that the specific form of the alarm information here is diverse, and it can be the following embodiment or other embodiments. Those skilled in the art can determine the specific form of the alarm information according to the actual situation, and the embodiments of this application do not limit it in this regard.

[0125] For example, the specific form of the alarm information is abnormal noise from the air conditioner. When the subcooling liquid pipe 23 is unstable, the subcooling control is canceled. At this time, the ratio of liquid and gaseous refrigerant in the subcooling liquid pipe 23 is uncertain, causing the refrigerant to form a discontinuous two-phase flow state with varying degrees of intensity. The two-phase flow state will cause the pipe to vibrate, resulting in abnormal noise. That is, when the subcooling liquid pipe 23 malfunctions, it will produce abnormal noise. At the same time, because the refrigerant in the first refrigerant pipe 10 is controlled to flow to the third refrigerant pipe 30, the two-phase flow phenomenon of the refrigerant in the first refrigerant pipe 10 is strengthened, which amplifies the degree of abnormal noise.

[0126] For example, the alarm information is in the form of a flashing light. When it is determined that the supercooled liquid pipe 23 is malfunctioning, some light modules of the indoor unit 3 are driven to flash to achieve the alarm effect.

[0127] It should be understood that the specific form of generating alarm information here is diverse, and it can be the following embodiment or other embodiments. Those skilled in the art can determine the specific form of alarm information according to the actual situation, and the embodiments of this application do not limit it in this regard.

[0128] For example, alarm information can be divided into multiple types. For instance, alarm information includes first alarm information and second alarm information. When the second difference is less than or equal to a second preset value, it is determined whether the second difference is less than or equal to the second preset value. When the second difference is less than the second preset value, first alarm information is generated. When the second difference is equal to the second preset value, second alarm information is generated.

[0129] For example, alarm information can be divided into multiple types. Taking alarm information as an example again, it includes first alarm information and second alarm information. By detecting that the second difference is within a certain numerical range, the corresponding alarm information is generated. When the second difference is in the first range, the first alarm information is generated; when the second difference is in the second range, the second alarm information is generated.

[0130] like Figure 9 As shown, Figure 9 This is a flowchart of a refrigerant leak detection method provided in another embodiment of this application. In one embodiment, after step S603, step S302 includes, but is not limited to, the following sub-steps.

[0131] Step S901: When the refrigerant subcooling degree is greater than or equal to the preset subcooling degree, the air conditioner is confirmed to be operating normally.

[0132] like Figure 10 As shown, Figure 10 yes Figure 3 A schematic diagram of another sub-step of step S302. In one embodiment, after step S403, step S302 includes, but is not limited to, the following sub-steps.

[0133] Step S1001, the compressor is controlled to stop, and alarm information for prompting refrigerant leakage is generated.

[0134] It should be understood that the specific form of the alarm information herein is various, and can be the following embodiments or other embodiments. Those skilled in the art can determine the specific form of the alarm information according to actual conditions, and the embodiments of the present application do not limit the specific form of the alarm information.

[0135] For example, the specific form of the alarm information is stroboscopic. When it is determined that the refrigerant leaks, some light modules of the indoor unit 3 are driven to stroboscopically flash to achieve the alarm effect.

[0136] For example, the air conditioner is provided with a corresponding remote controller, and the remote controller is provided with a sound alarm module. When it is determined that the refrigerant leaks, the remote controller drives the sound alarm module to issue a sound alarm to achieve the alarm effect.

[0137] As shown in Figure 11 , FIG. 1 is a whole step flow chart of a refrigerant leakage detection method provided by an embodiment of the present application, including but not limited to the following steps. Figure 11

[0138] Step S1101, the exhaust temperature T c , the suction temperature T X , the first refrigerant temperature T g flowing through the liquid pipe, and the second refrigerant temperature T a and the third refrigerant temperature T c′ of the indoor unit of the compressor are acquired.

[0139] Step S1102, it is judged whether the condition exhaust temperature T c -suction temperature T X ≤ first preset value T1 is met. If yes, step S1103 is executed, and if not, step 1104 is executed.

[0140] Step S1103, it is determined that the air conditioner fails, and the air conditioner is controlled to stop.

[0141] Step S1104, it is judged whether the condition first refrigerant temperature T g -exhaust temperature T c ≤ second preset value T2 is met. If yes, step S1105 is executed, and if not, step S1106 is executed.

[0142] Step S1105, it is determined that the system is unstable, the supercooling control is cancelled, the noise is increased, and an alarm is given.

[0143] Step S1106, it is judged whether the condition second refrigerant temperature T a -third refrigerant temperature T c′ ​> If the third preset value T3 is true, proceed to step S1107; otherwise, proceed to step S1108.

[0144] Step S1107: Determine refrigerant leakage, control the compressor to stop, and generate alarm information to indicate refrigerant leakage.

[0145] Step S1108: Confirm that the air conditioner is operating normally and there is no action.

[0146] Based on the refrigerant leakage detection methods described in the above embodiments, the following presents various embodiments of the controller and computer-readable storage medium of this application.

[0147] Specifically, based on the above Figure 11 The refrigerant leak detection method includes the following implementation steps.

[0148] First, determine if the air conditioner is malfunctioning. If so, shut down the air conditioner. If not, proceed to step two.

[0149] Second, determine whether the air conditioner's overcooling control is stable. If not, cancel the overcooling control, increase the noise of the air conditioner and sound an alarm. If it is stable, proceed to step three.

[0150] 3. To determine if the air conditioner is leaking refrigerant, T a -T c′ >T3 indicates whether the temperature difference between the second refrigerant temperature and the third refrigerant temperature is greater than the third preset value T3. The third preset value T3 is used to measure the refrigerant subcooling. If it is, the compressor is controlled to stop and a refrigerant leak alarm is generated. If not, the air conditioner operates normally and no action is taken.

[0151] Based on the above control method, the embodiments of this application include, but are not limited to, the following advantages: 1. For machines where the outdoor unit consistently fails to establish subcooling during operation, subcooling control is directly canceled, increasing refrigerant noise in the indoor unit to alert the user that the machine may have an abnormality requiring attention. 2. By calculating refrigerant subcooling in real time, the system's refrigerant leakage can be monitored in real time. 3. The method has good compatibility and can be applied to different types and brands of air conditioners.

[0152] like Figure 12 As shown, Figure 12 This is a schematic diagram of the structure of a controller for performing a detection method of a refrigerant leak detection device according to an embodiment of this application. The controller 200 implemented in this application includes: a processor 210, a memory 220, and a computer program stored in the memory 220 and executable on the processor 210, wherein... Figure 12 The example uses a processor 210 and a memory 220.

[0153] The processor 210 and the memory 220 can be connected by a bus or other means, Figure 12 The bus connection is taken as an example.

[0154] The memory 220, as a non-transitory computer readable storage medium, can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory 220 can include a high-speed random access memory, and can also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state memory device. In some embodiments, the memory 220 can optionally include a memory 220 remotely arranged relative to the processor 210, and these remote memories 220 can be connected to the controller 200 through a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0155] Those skilled in the art can understand that, Figure 12 The device structure shown in the above embodiments does not constitute a limitation on the controller 200, and can include more or fewer components than those shown, or combine certain components, or different component arrangements.

[0156] In Figure 12 In the controller 200 shown, the processor 210 can be used to call the control program of the refrigerant leakage detection device stored in the memory 220, so as to realize the detection method of the refrigerant leakage detection device described above. Specifically, the non-transitory software programs and instructions required to realize the detection method of the refrigerant leakage detection device of the above embodiments are stored in the memory 220, and when executed by the processor 210, the detection method of the refrigerant leakage detection device of the above embodiments is executed.

[0157] It is worth noting that since the controller 200 of the embodiments of the present application can execute the detection method of the refrigerant leakage detection device of any of the above embodiments, the specific implementation and technical effects of the controller 200 of the embodiments of the present application can refer to the specific implementation and technical effects of the detection method of the refrigerant leakage detection device of any of the above embodiments.

[0158] In addition, one embodiment of the present application also provides a computer readable storage medium storing computer executable instructions for executing the detection method of the refrigerant leakage detection device described above. Illustratively, the method steps in the above description are executed. Figures 3 to 11

[0159] ​It is worth noting that the computer readable storage medium of the embodiments of the present application can perform the detection method of the refrigerant leakage detection device of any of the above embodiments, and therefore the specific implementation and technical effects of the computer readable storage medium of the embodiments of the present application can refer to the specific implementation and technical effects of the refrigerant leakage detection device and the detection method thereof of any of the above embodiments.

[0160] Those of ordinary skill in the art will understand that all or some of the steps in the above disclosed method, system can be implemented as software, firmware, hardware and their appropriate combinations. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software can be distributed on a computer readable medium, which can include computer storage media (or non-transitory media) and communication media (or transitory media). As known to those of ordinary skill in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. In addition, it is known to those of ordinary skill in the art that communication media generally includes computer readable instructions, data structures, program modules or other data in modulated data signals such as carrier waves or other transport mechanisms, and can include any information delivery medium.

[0161] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "connection", "direct connection", "indirect connection", "fixed connection", "installation", "assembly" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; the terms "installation", "connection", "fixed connection" can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0162] Although the present application has been described with reference to the above embodiments, the contents of the present application are merely the embodiments adopted for the purpose of facilitating the understanding of the present application, and are not intended to limit the present application. Any person skilled in the art, without departing from the spirit and scope of the present application, can make any modification and change in the form and details of the implementation, but the patent protection scope of the present application shall be subject to the definition of the appended claims.

[0163] The above is a specific description of the preferred embodiments of the present application, but the present application is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application. These equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. An air conditioner characterized by comprising: The air conditioner comprises an outdoor unit, an indoor unit and a refrigerant leakage detection device, wherein the refrigerant leakage detection device comprises: a first refrigerant pipe, an inlet of the first refrigerant pipe being connected to the outdoor unit and an outlet of the first refrigerant pipe being connected to the indoor unit; a second refrigerant pipe, an inlet of the second refrigerant pipe being connected to the indoor unit and an outlet of the second refrigerant pipe being connected to the outdoor unit; a third refrigerant pipe, an inlet of the third refrigerant pipe being connected to one end of the first refrigerant pipe close to the indoor unit and an outlet of the third refrigerant pipe being connected to the second refrigerant pipe, and refrigerant in the third refrigerant pipe being used for heat exchange with refrigerant in the first refrigerant pipe; a throttling device connected to the third refrigerant pipe, the throttling device being used for throttling refrigerant flowing into the third refrigerant pipe; In addition, a refrigerant outlet of the outdoor unit is connected to a refrigerant inlet of the indoor unit through the first refrigerant pipe, and a refrigerant outlet of the indoor unit is connected to a refrigerant inlet of the outdoor unit through the second refrigerant pipe. In addition, the outdoor unit is provided with a compressor, a condenser and a subcooled liquid pipe, and an exhaust outlet of the compressor is connected to the inlet of the first refrigerant pipe through the condenser and the subcooled liquid pipe in sequence.

2. The air conditioner of claim 1, wherein The third refrigerant pipe is sleeved on the surface of the first refrigerant pipe, and the flow direction of the refrigerant in the third refrigerant pipe is opposite to the flow direction of the refrigerant in the first refrigerant pipe.

3. The air conditioner of claim 1, wherein The throttling device is arranged in the third refrigerant pipe or arranged at a position on the inlet side of the third refrigerant pipe.

4. A refrigerant leakage detection method characterized by comprising: The refrigerant leakage detection method is applied to the air conditioner of claim 1, and the method comprises: obtaining an exhaust temperature and a suction temperature of the compressor, a first refrigerant temperature flowing through the subcooled liquid pipe and a refrigerant subcooling degree on the inlet side of the indoor unit; determining a refrigerant leakage state of the air conditioner according to the exhaust temperature, the suction temperature, the first refrigerant temperature and the refrigerant subcooling degree.

5. The method of claim 4, wherein, The determination of the refrigerant leakage state of the air conditioner according to the exhaust temperature, the suction temperature, the first refrigerant temperature and the refrigerant subcooling degree comprises: calculating a first difference value of the exhaust temperature and the suction temperature; calculating a second difference value of the first refrigerant temperature and the exhaust temperature; in a case where the first difference value is greater than a first preset value, the second difference value is greater than a second preset value and the refrigerant subcooling degree is less than a preset subcooling degree, it is determined that the air conditioner has refrigerant leakage.

6. The method of claim 4, wherein, The exhaust temperature is obtained in the following manner: obtaining an exhaust pressure of the compressor; determining the exhaust temperature of the compressor according to the exhaust pressure.

7. The method of claim 5, wherein, The refrigerant subcooling degree is obtained in the following manner: obtaining a refrigerant pressure and a second refrigerant temperature on the inlet side of the indoor unit; determining a third refrigerant temperature according to the refrigerant pressure; determining the refrigerant subcooling degree on the inlet side of the indoor unit according to the second refrigerant temperature and the third refrigerant temperature.

8. The method of claim 5, wherein, After the calculation of the first difference value of the exhaust temperature and the suction temperature, the method further comprises: when the first difference value is less than or equal to the first preset value, it is determined that the air conditioner has a fault, and the air conditioner is controlled to stop.

9. The method of claim 5, wherein, After the calculation of the second difference value of the first refrigerant temperature and the exhaust temperature, the method further comprises: When the second difference is less than or equal to the second preset value, the refrigerant in the first refrigerant pipe is controlled to stop flowing to the third refrigerant pipe, and an alarm information is generated.

10. The method of claim 7, wherein, After the determination of the refrigerant supercooling degree at the inlet side of the indoor unit according to the second refrigerant temperature and the third refrigerant temperature, the method further comprises: When the refrigerant supercooling degree is greater than or equal to the preset supercooling degree, it is determined that the air conditioner is operating normally.

11. The method of claim 5, wherein, After the determination that the air conditioner has refrigerant leakage, the method further comprises: The compressor is controlled to stop, and an alarm information for prompting refrigerant leakage is generated.

12. A controller characterized by comprising: Comprise: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the computer program to perform the refrigerant leakage detection method according to any one of claims 4 to 11.

13. A computer-readable storage medium, characterized in that: Computer executable instructions are stored, and the computer executable instructions are used to perform the refrigerant leakage detection method according to any one of claims 4 to 11.

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