Multi-connected air conditioner refrigerant leakage processing method and device and multi-connected air conditioner system

Abstract

The invention discloses a multi-connected air conditioner refrigerant leakage processing method and device and a multi-connected air conditioner system, and relates to the technical field of air conditioner refrigerant leakage control. According to the method, after a refrigerant leakage signal is received, if the multi-connected air conditioner system does not operate in a refrigeration mode at present, the multi-connected air conditioner system is switched into the refrigeration mode; a first refrigerant leakage control strategy is determined according to the current starting number of the indoor units, and the first refrigerant leakage control strategy comprises the step that electronic expansion valves of the indoor units with refrigerant leakage are closed; and the indoor units in the multi-connected air conditioning system are controlled according to the first refrigerant leakage control strategy, so that refrigerant leakage is controlled, and refrigerant leakage can be effectively controlled while the indoor units without leakage normally operate.

Description

Technical Field

[0001] The present application relates to the field of air conditioning technology, and in particular to a method and device for handling refrigerant leakage in a multi-split air conditioner, and a multi-split air conditioning system. Background Art

[0002] Refrigerant leakage will not only affect the normal operation of the air conditioning system, but also pollute the environment and cause certain harm to human health. Among the common refrigerants, R32 refrigerant is flammable and explosive. Air conditioners using this refrigerant must take appropriate anti-leakage measures when working, and usually use refrigerant sensors to detect its leakage.

[0003] In a one-to-many air conditioning system, each indoor unit will be equipped with a refrigerant sensor. When a refrigerant leak is detected, the air conditioner buzzer will beep for 5 seconds to issue a warning, and the indoor unit display board will report a fault code. At the same time, the indoor fan will switch to super-strong gear to reduce the concentration of leaked refrigerant, and then the air conditioner outdoor unit compressor will stop, causing the entire air conditioning system to stop operating. The disadvantage of this control method is that when a refrigerant leak occurs in one or a few indoor units of the one-to-many air conditioning system, the entire system will be shut down for protection and cannot operate normally, affecting the user experience, and the cost is relatively high. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the present application provides a method and device for handling refrigerant leakage of a multi-split air conditioner and a multi-split air conditioner system.

[0005] The technical solution adopted by this application to solve its technical problem is:

[0006] In a first aspect, a method for handling refrigerant leakage of a multi-split air conditioner is provided, comprising:

[0007] After receiving the refrigerant leakage signal, if the multi-connected air-conditioning system is not currently operating in the cooling mode, switching the multi-connected air-conditioning system to the cooling mode;

[0008] Determining a first refrigerant leakage control strategy according to the number of indoor units currently turned on, wherein the first refrigerant leakage control strategy includes closing the electronic expansion valve of the indoor unit where the refrigerant leakage occurs;

[0009] The indoor units in the multi-connected air-conditioning system are controlled according to the first refrigerant leakage control strategy to achieve control of refrigerant leakage.

[0010] Furthermore, it also includes: determining a second refrigerant leakage control strategy according to the pressure ratio and compressor frequency of the multi-split air-conditioning system; and controlling the multi-split air-conditioning system according to the second refrigerant leakage control strategy to achieve further control of refrigerant leakage.

[0011] Furthermore, determining the first refrigerant leakage control strategy based on the current number of indoor units turned on includes: determining the current number of indoor units turned on; if the current number of indoor units turned on is 1, the first refrigerant leakage control strategy also includes: turning on all indoor units that have not experienced refrigerant leakage and running them in cooling mode; if the current number of indoor units turned on is greater than 1, determining the first refrigerant leakage control strategy based on the number of indoor units with refrigerant leakage and the current number of indoor units turned on.

[0012] Furthermore, determining the first refrigerant leakage control strategy based on the number of indoor units with refrigerant leakage and the current number of indoor units turned on includes: if the number of indoor units with refrigerant leakage and the current number of indoor units turned on are equal, then the first refrigerant leakage control strategy also includes: turning on all indoor units without refrigerant leakage and running them in cooling mode.

[0013] Furthermore, determining the second refrigerant leakage control strategy based on the pressure ratio and compressor frequency of the multi-split air-conditioning system includes: obtaining the pressure ratio of the multi-split air-conditioning system, where the pressure ratio is the ratio of the exhaust pressure to the intake pressure; if the pressure ratio is not within the first specified numerical range, then the second refrigerant leakage control strategy includes: adjusting the compressor frequency so that the pressure ratio is within the first specified numerical range.

[0014] Furthermore, adjusting the compressor frequency includes: if the pressure ratio is lower than a first preset value, increasing the compressor frequency; if the pressure ratio is higher than a second preset value, decreasing the compressor frequency.

[0015] Furthermore, the first specified numerical range is between 4:1 and 6:1, the first preset value is 4:1, and the second preset value is 6:1.

[0016] Furthermore, it also includes: detecting refrigerant leakage signals in real time.

[0017] Further, after receiving the refrigerant leakage signal, the buzzer of the indoor unit where the refrigerant leakage occurs is triggered to sound continuously for 5 seconds.

[0018] In a second aspect, a multi-connected air conditioner refrigerant leakage treatment device is provided, comprising:

[0019] a cooling mode switching unit, configured to switch the multi-connected air conditioning system to a cooling mode after receiving a refrigerant leakage signal if the multi-connected air conditioning system is not currently operating in a cooling mode;

[0020] A first refrigerant leakage control strategy determining unit, configured to determine a first refrigerant leakage control strategy according to the number of indoor units currently turned on, wherein the first refrigerant leakage control strategy includes closing an electronic expansion valve of an indoor unit where refrigerant leakage occurs;

[0021] The first refrigerant leakage control unit is used to control the indoor units in the multi-connected air-conditioning system according to the first refrigerant leakage control strategy to achieve control of refrigerant leakage.

[0022] In a third aspect, a multi-connected air conditioning system is provided, including a refrigerant leakage controller, wherein the refrigerant leakage controller includes:

[0023] at least one processor and at least one memory;

[0024] The memory stores executable instructions of the processor;

[0025] The processor is configured to execute any of the above-mentioned multi-split air conditioner refrigerant leakage processing.

[0026] Beneficial effects:

[0027] The technical solution of the present application provides a method and device for handling refrigerant leakage of a multi-split air conditioner, and a multi-split air conditioning system. After receiving a refrigerant leakage signal, if the multi-split air conditioning system is not currently operating in the cooling mode, the method switches the multi-split air conditioning system to the cooling mode; determines a first refrigerant leakage control strategy according to the current number of indoor units turned on, and closes the electronic expansion valve of the indoor unit where the refrigerant leakage occurs; controls the indoor units in the multi-split air conditioning system according to the first refrigerant leakage control strategy to achieve control of the refrigerant leakage. The method allows the air conditioning system to respond at the moment the refrigerant leakage is detected, thereby ensuring the normal operation of the air conditioning system and controlling the refrigerant leakage, thereby reducing the harm of the refrigerant leakage to the human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is a flow chart of a method for handling refrigerant leakage of a multi-split air conditioner provided in an embodiment of the present application;

[0030] Figure 2 It is a flow chart of another method for handling refrigerant leakage of a multi-split air conditioner provided in an embodiment of the present application;

[0031] Figure 3 yes Figure 2 A schematic diagram of a process for determining a first refrigerant leakage control strategy in the illustrated embodiment;

[0032] Figure 4 yes Figure 2A schematic diagram of a flow chart for determining a second refrigerant leakage control strategy in the illustrated embodiment;

[0033] Figure 5 yes Figure 2 A schematic diagram of a segmented process of a method for handling refrigerant leakage of a multi-split air conditioner according to the embodiment shown;

[0034] Figure 6 yes Figure 2 A schematic diagram of the structure of a refrigerant leakage detection system for a multi-split air conditioner in the illustrated embodiment;

[0035] Figure 7 It is a functional structure diagram of a multi-connected air-conditioning refrigerant leakage treatment device provided in an embodiment of the present application;

[0036] Figure 8 It is a functional structure diagram of another multi-connected air-conditioning refrigerant leakage treatment device provided in an embodiment of the present application;

[0037] Fig. 9 It is a functional structure diagram of a multi-connected air conditioning system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application is described in detail below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other implementation methods obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0039] To solve this problem, refer to Figure 1 The embodiment of the present application provides a method for handling refrigerant leakage of a multi-split air conditioner, the method being used in a multi-split air conditioner system, the method comprising:

[0040] 101. After receiving a refrigerant leakage signal, if the multi-split air-conditioning system is not currently operating in cooling mode, the multi-split air-conditioning system is switched to cooling mode.

[0041] 102. Determine a first refrigerant leakage control strategy according to the number of indoor units currently turned on, where the first refrigerant leakage control strategy includes closing an electronic expansion valve of an indoor unit where refrigerant leakage occurs.

[0042] 103. Control the indoor units in the multi-connected air-conditioning system according to the first refrigerant leakage control strategy to achieve control of refrigerant leakage.

[0043] The present embodiment discloses a method for handling refrigerant leakage of a multi-split air conditioner. After a refrigerant leakage occurs in the multi-split air conditioner, if the multi-split air conditioner system is not currently operating in the cooling mode, the multi-split air conditioner system is switched to the cooling mode, and a first refrigerant leakage control strategy is determined according to the number of indoor units turned on. The first refrigerant leakage control strategy includes closing the electronic expansion valve of the indoor unit where the refrigerant leakage occurs, and adjusting the operating mode of the multi-split air conditioner to control the refrigerant leakage. This method only shuts down the indoor unit where the refrigerant leakage occurs, without shutting down the entire multi-split air conditioner system. While reducing the refrigerant leakage, the normal operation of the remaining indoor units where no leakage occurs is guaranteed, thereby effectively improving the user experience.

[0044] As an improvement of the above embodiment, the embodiment of the present invention provides another method for handling refrigerant leakage of a multi-split air conditioner, which is used in a multi-split air conditioner system.

[0045] The main reason why the refrigerant leakage frequency in the cooling mode of the air-conditioning system is lower than that in the heating mode is the difference between the cooling and heating conditions and the difference in the refrigerant circulation volume.

[0046] First, the difference between cooling and heating conditions leads to different refrigerant circulation volumes. Under cooling conditions, the system's operating pressure is relatively small, and the evaporator usually operates at an evaporation temperature of around 5°C, while under heating conditions, the evaporation temperature is generally around 2°C, and the pressure ratio is larger, resulting in a lower volume flow rate. In addition, the saturated vapor density decreases at low temperatures, further reducing the refrigerant circulation volume during heating.

[0047] Secondly, the cause of refrigerant leakage will also affect the frequency of refrigerant leakage. The main causes of refrigerant leakage include system failure (such as leakage, blockage, pipe sinking, compressor failure, etc.), pipe connection problems (such as loose connection, broken bell mouth, etc.), system pipe aging, welding quality problems and equipment aging. These factors may occur during both cooling and heating, but due to the greater changes in system pressure and temperature under heating conditions, more leakage points may be activated.

[0048] Finally, the detection method of refrigerant leakage is also different. In the event of refrigerant leakage, it can be judged by observing the size of the frosted area of ​​the evaporator. In the heating process, due to changes in system pressure and temperature, leakage detection may require more complex methods. Based on the above problems, this embodiment quickly controls the shutdown of the indoor unit with refrigerant leakage and switches the remaining indoor units to cooling mode to control the leakage of refrigerant. Figure 2 , the method provided in this embodiment includes:

[0049] 201. Detect refrigerant leakage signals in real time.

[0050] 202. After receiving the refrigerant leakage signal, the buzzer of the indoor unit where the refrigerant leakage occurs is triggered to sound continuously for 5 seconds.

[0051] The multi-split air-conditioning system is equipped with a refrigerant leakage detection unit and an alarm unit to perform real-time refrigerant leakage detection on the multi-split air-conditioning system. After detecting a refrigerant leakage, the buzzer of the corresponding indoor unit is triggered to emit a continuous beeping sound for 5 seconds.

[0052] 203. If the multi-split air conditioning system is not currently operating in cooling mode, switch the multi-split air conditioning system to cooling mode.

[0053] After a refrigerant leak occurs, first determine whether the air-conditioning system is operating in cooling mode. After receiving feedback that it is operating in cooling mode, keep running in this mode. If it is in any other mode other than cooling mode, adjust the air-conditioning system to operate in cooling mode to ensure that the indoor side is at the low-pressure side.

[0054] 204. Determine a first refrigerant leakage control strategy according to the number of indoor units currently turned on. The first refrigerant leakage control strategy includes closing an electronic expansion valve of an indoor unit where refrigerant leakage occurs.

[0055] This embodiment allows the air-conditioning indoor unit operating mode to be quickly adjusted to reduce system pressure and slow down refrigerant leakage, and completely closes the electronic expansion valve of the indoor unit that has leaked refrigerant to prevent refrigerant leakage, thereby reducing harm to the human body and environmental pollution, and ensuring the normal operation of other indoor units.

[0056] In some alternative embodiments, see Figure 3 , the first refrigerant leakage control strategy may be determined by, but is not limited to, the following process:

[0057] 2041. Determine the number of indoor units currently turned on.

[0058] 2042. If the current number of indoor units turned on is 1, the first refrigerant leakage control strategy further includes: turning on all indoor units without refrigerant leakage and operating them in cooling mode.

[0059] 2043. If the current number of indoor units turned on is greater than 1, determine a first refrigerant leakage control strategy according to the number of indoor units with refrigerant leakage and the current number of indoor units turned on.

[0060] Specifically, if the number of indoor units with refrigerant leakage is equal to the number of currently powered-on indoor units, the first refrigerant leakage control strategy further includes: powering on all indoor units without refrigerant leakage and operating them in cooling mode.

[0061] Specifically, after adjusting the air-conditioning operation mode, it is determined whether the number of indoor units turned on is 1. If so, the electronic expansion valve of the indoor unit with refrigerant leakage is closed, and all other indoor units are turned on to operate in cooling mode. If not, it is then determined whether the number of refrigerant leakage units is equal to the number of turned-on units. If so, the electronic expansion valve corresponding to the indoor unit with refrigerant leakage is closed, and all other indoor units are turned on and operate in cooling mode. If the number of refrigerant leakage units is less than the number of turned-on units, the electronic expansion valve of the indoor unit with refrigerant leakage is closed, and the other indoor units continue to operate.

[0062] 205. Control the indoor units in the multi-split air-conditioning system according to the first refrigerant leakage control strategy to achieve control of refrigerant leakage.

[0063] 206. Determine a second refrigerant leakage control strategy according to the pressure ratio and compressor frequency of the multi-split air conditioning system.

[0064] In some alternative embodiments, see Figure 4 , the second refrigerant leakage control strategy may be determined by, but is not limited to, the following process:

[0065] 2061. Obtain the pressure ratio of the multi-split air conditioning system, which is the ratio of the exhaust pressure to the suction pressure.

[0066] 2062. If the pressure ratio is not within the first specified numerical range, the second refrigerant leakage control strategy includes: adjusting the compressor frequency so that the pressure ratio is within the first specified numerical range.

[0067] Specifically, adjusting the compressor frequency includes:

[0068] If the pressure ratio is lower than the first preset value, the compressor frequency is increased.

[0069] If the pressure ratio is higher than the second preset value, the compressor frequency is reduced.

[0070] In some optional embodiments, the first specified numerical range is between 4:1 and 6:1, the first preset value is 4:1, and the second preset value is 6:1.

[0071] Specifically, the ratio of exhaust pressure to suction pressure (i.e., pressure ratio) is obtained to determine whether the value is between 4:1 and 6:1. If it is within this range, the current parameters are maintained and the operation continues. If the pressure ratio is higher than 6:1, the compressor frequency is reduced to return the pressure ratio to the normal range; if the pressure ratio is lower than 4:1, the compressor frequency is increased to adjust the pressure ratio to the normal range.

[0072] 207. Control the multi-connected air conditioning system according to the second refrigerant leakage control strategy to achieve further control of refrigerant leakage.

[0073] See also Figure 5The multi-split air conditioner refrigerant leakage processing method provided in this embodiment can be divided into a refrigerant leakage alarm stage, a system control stage after the refrigerant leakage and a subsequent adjustment processing stage. First, the indoor unit operation mode is determined, and the number of indoor units turned on is determined, and then the air-conditioning indoor unit operation mode is quickly adjusted to reduce the indoor side pressure and reduce the degree of refrigerant leakage. The electronic expansion valve of the indoor unit that has leaked refrigerant is completely closed to reduce the harm of refrigerant leakage to the human body and the pollution to the environment, while also ensuring the normal operation of the remaining air-conditioning indoor units.

[0074] by Figure 6 Taking the structure of the one-to-many air conditioner cold leakage detection system as an example, if the refrigerant sensor of indoor unit A detects a refrigerant leak, the buzzer of unit A will beep for 5 seconds. At this time, it will be determined whether the entire system is in cooling mode. If it is cooling mode, it will continue to operate in this mode. If it is in other modes, the system will immediately switch to cooling mode. The next judgment result is: at this time, the number of indoor units turned on is one, so the electronic expansion valve A is closed, and indoor units B~D are turned on and work in cooling mode. Then, by obtaining the ratio of exhaust pressure to suction pressure (i.e., pressure ratio), it is determined whether the pressure ratio is between 4:1 and 6:1. If so, keep the current state and continue to operate. If the pressure ratio is higher than 6:1, the pressure ratio is returned to the normal range by reducing the compressor frequency; if the pressure ratio is lower than 4:1, the pressure ratio is returned to the normal range by increasing the compressor frequency.

[0075] The present embodiment discloses a method for handling refrigerant leakage of a multi-split air conditioner. After a refrigerant leakage occurs in the multi-split air conditioner, if the multi-split air conditioner system is not currently operating in the cooling mode, the multi-split air conditioner system is switched to the cooling mode, and a first refrigerant leakage control strategy is determined according to the number of indoor units turned on. The first refrigerant leakage control strategy includes closing the electronic expansion valve of the indoor unit where the refrigerant leakage occurs. The second refrigerant leakage control strategy is determined according to the pressure ratio and compressor frequency of the multi-split air conditioner system. The refrigerant leakage is controlled by adjusting the operating mode of the multi-split air conditioner. The double refrigerant leakage control effectively ensures the refrigerant leakage control effect. This method only shuts down the indoor unit where the refrigerant leakage occurs, without shutting down the entire multi-split air conditioner system. While reducing the refrigerant leakage, the normal operation of the remaining indoor units where no leakage occurs is guaranteed, thereby effectively improving the user experience.

[0076] In order to cooperate with the implementation of the above-mentioned multi-connected air conditioner refrigerant leakage processing method, the embodiment of the present invention provides a multi-connected air conditioner refrigerant leakage processing device, which is used in a multi-connected air conditioner system, referring to Figure 7 , the device comprises:

[0077] The cooling mode switching unit 71 is used to switch the multi-connected air-conditioning system to the cooling mode after receiving the refrigerant leakage signal if the multi-connected air-conditioning system is not currently operating in the cooling mode.

[0078] The first refrigerant leakage control strategy determining unit 72 is used to determine a first refrigerant leakage control strategy according to the current number of indoor units turned on. The first refrigerant leakage control strategy includes closing the electronic expansion valve of the indoor unit where the refrigerant leakage occurs.

[0079] The first refrigerant leakage control unit 73 is used to control the indoor units in the multi-connected air-conditioning system according to the first refrigerant leakage control strategy to achieve control of refrigerant leakage.

[0080] The multi-split air conditioner refrigerant leakage processing device disclosed in the present embodiment has a cooling mode switching unit, after a refrigerant leakage occurs in the multi-split air conditioner, if the multi-split air conditioner system is not currently operating in the cooling mode, then the multi-split air conditioner system will be switched to the cooling mode, and the first refrigerant leakage control strategy determination unit determines the first refrigerant leakage control strategy according to the number of indoor units turned on, the first refrigerant leakage control strategy includes closing the electronic expansion valve of the indoor unit where the refrigerant leakage occurs, and adjusting the operating mode of the multi-split air conditioner to achieve control of the refrigerant leakage. This method only shuts down the indoor unit where the refrigerant leakage occurs, without shutting down the entire multi-split air conditioner system, thereby reducing the refrigerant leakage while ensuring the normal operation of the remaining indoor units where no leakage occurs, thereby effectively improving the user experience.

[0081] As an improvement of the above-mentioned multi-connected air conditioner refrigerant leakage processing device, the embodiment of the present invention provides another multi-connected air conditioner refrigerant leakage processing device, the device is used in a multi-connected air conditioner system, referring to Figure 8 , the device comprises:

[0082] The refrigerant leakage detection unit 81 is used to detect the refrigerant leakage signal in real time.

[0083] The alarm unit 82 is used to trigger the buzzer of the indoor unit where the refrigerant leakage occurs to sound continuously for 5 seconds after receiving the refrigerant leakage signal.

[0084] The cooling mode switching unit 83 is used to switch the multi-connected air-conditioning system to the cooling mode after receiving the refrigerant leakage signal if the multi-connected air-conditioning system is not currently operating in the cooling mode.

[0085] The first refrigerant leakage control strategy determining unit 84 is used to determine a first refrigerant leakage control strategy according to the current number of indoor units turned on. The first refrigerant leakage control strategy includes closing the electronic expansion valve of the indoor unit where the refrigerant leakage occurs.

[0086] In some optional embodiments, the first refrigerant leakage control strategy determination unit 84 includes:

[0087] The power-on quantity determination module 841 is used to determine the current power-on quantity of indoor units.

[0088] The first refrigerant leakage determination module 842, if the current number of indoor units turned on is 1, then the first refrigerant leakage control strategy also includes: turning on all indoor units without refrigerant leakage and running them in cooling mode; if the current number of indoor units turned on is greater than 1, then determining the first refrigerant leakage control strategy based on the number of indoor units with refrigerant leakage and the current number of indoor units turned on; if the number of indoor units with refrigerant leakage is equal to the current number of indoor units turned on, then the first refrigerant leakage control strategy also includes: turning on all indoor units without refrigerant leakage and running them in cooling mode.

[0089] The first refrigerant leakage control unit 85 is used to control the indoor units in the multi-connected air-conditioning system according to the first refrigerant leakage control strategy to achieve control of refrigerant leakage.

[0090] The second refrigerant leakage control strategy determining unit 86 is used to determine the second refrigerant leakage control strategy according to the pressure ratio and compressor frequency of the multi-connected air-conditioning system.

[0091] In some optional embodiments, the second refrigerant leakage control strategy determination unit 86 includes:

[0092] The pressure ratio acquisition module 861 is used to obtain the pressure ratio of the multi-connected air conditioning system. The pressure ratio is the ratio of the exhaust pressure to the suction pressure.

[0093] The pressure ratio adjustment module 862 is used for, if the pressure ratio is not within the first specified value range, the second refrigerant leakage control strategy includes: adjusting the compressor frequency to make the pressure ratio within the first specified value range.

[0094] Adjusting the compressor frequency includes: if the pressure ratio is lower than a first preset value, increasing the compressor frequency; if the pressure ratio is higher than a second preset value, decreasing the compressor frequency.

[0095] The second refrigerant leakage control unit 87 is used to control the multi-connected air-conditioning system according to the second refrigerant leakage control strategy to achieve further control of refrigerant leakage.

[0096] The multi-split air-conditioner refrigerant leakage processing device disclosed in the present embodiment has a cooling mode switching unit, after a refrigerant leakage occurs in the multi-split air-conditioner, if the multi-split air-conditioning system is not currently operating in the cooling mode, the multi-split air-conditioning system is switched to the cooling mode, the first refrigerant leakage control strategy determination unit determines the first refrigerant leakage control strategy according to the number of indoor units turned on, the first refrigerant leakage control strategy includes closing the electronic expansion valve of the indoor unit where the refrigerant leakage occurs, the second refrigerant leakage control strategy determination unit determines the second refrigerant leakage control strategy according to the pressure ratio and compressor frequency of the multi-split air-conditioning system, and the refrigerant leakage is controlled by adjusting the operating mode of the multi-split air-conditioner, the double refrigerant leakage control effectively ensures the refrigerant leakage control effect, the method only shuts down the indoor unit where the refrigerant leakage occurs, and there is no need to shut down the entire multi-split air-conditioning system, while reducing the refrigerant leakage, ensuring the normal operation of the remaining indoor units that have not leaked, effectively improving the user experience.

[0097] Based on the same inventive concept, Fig. 9 The present application also provides a multi-connected air conditioning system, including a refrigerant leakage controller, the refrigerant leakage controller includes:

[0098] at least one processor 91 and at least one memory 92;

[0099] The memory stores executable instructions for the processor;

[0100] The processor is configured to execute the multi-split air conditioner refrigerant leakage processing method provided in the above embodiment.

[0101] The multi-split air-conditioning system provided in the embodiment of the present application stores executable instructions of the processor in a memory. When the executable instructions are executed, the processor can, after a refrigerant leakage occurs in the multi-split air-conditioning, if the multi-split air-conditioning system is not currently operating in the cooling mode, switch the multi-split air-conditioning system to the cooling mode, and determine a first refrigerant leakage control strategy according to the number of indoor units turned on. The first refrigerant leakage control strategy includes closing the electronic expansion valve of the indoor unit where the refrigerant leakage occurs. The second refrigerant leakage control strategy is determined according to the pressure ratio and compressor frequency of the multi-split air-conditioning system. The refrigerant leakage is controlled by adjusting the operating mode of the multi-split air-conditioning. The double refrigerant leakage control effectively ensures the refrigerant leakage control effect. This method only shuts down the indoor unit where the refrigerant leakage occurs, without shutting down the entire multi-split air-conditioning system. While reducing the refrigerant leakage, the normal operation of the remaining indoor units that have not leaked is guaranteed, effectively improving the user experience.

[0102] It should be noted that, in the description of this application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0103] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

Claims

1. A method for handling refrigerant leakage in a multi-split air conditioner, characterized in that: include: After receiving the refrigerant leakage signal, if the multi-connected air-conditioning system is not currently operating in the cooling mode, switching the multi-connected air-conditioning system to the cooling mode; Determining a first refrigerant leakage control strategy according to the number of indoor units currently turned on, wherein the first refrigerant leakage control strategy includes closing the electronic expansion valve of the indoor unit where the refrigerant leakage occurs; The indoor units in the multi-connected air-conditioning system are controlled according to the first refrigerant leakage control strategy to achieve control of refrigerant leakage.

2. The method according to claim 1, characterized in that: Also includes: Determining a second refrigerant leakage control strategy according to the pressure ratio and compressor frequency of the multi-connected air conditioning system; The multi-connected air-conditioning system is controlled according to the second refrigerant leakage control strategy to achieve further control of refrigerant leakage.

3. The method according to claim 2, characterized in that: Determining the first refrigerant leakage control strategy based on the current number of indoor units turned on includes: Determine the number of indoor units currently turned on; If the current number of indoor units turned on is 1, the first refrigerant leakage control strategy further includes: turning on all indoor units without refrigerant leakage and operating them in cooling mode; If the current number of indoor units turned on is greater than 1, the first refrigerant leakage control strategy is determined according to the number of indoor units with refrigerant leakage and the current number of indoor units turned on.

4. The method according to claim 3, characterized in that: Determining the first refrigerant leakage control strategy according to the number of indoor units where refrigerant leakage occurs and the number of currently powered-on indoor units includes: If the number of indoor units with refrigerant leakage is equal to the number of currently powered-on indoor units, the first refrigerant leakage control strategy further includes: powering on all indoor units without refrigerant leakage and operating them in cooling mode.

5. The method according to claim 2, characterized in that: Determining the second refrigerant leakage control strategy according to the pressure ratio and compressor frequency of the multi-connected air conditioning system includes: Obtaining a pressure ratio of the multi-connected air conditioning system, wherein the pressure ratio is a ratio of exhaust pressure to suction pressure; If the pressure ratio is not within the first specified value range, the second refrigerant leakage control strategy includes: adjusting the compressor frequency so that the pressure ratio is within the first specified value range.

6. The method according to claim 5, characterized in that: Adjusting the compressor frequency includes: If the pressure ratio is lower than a first preset value, increasing the compressor frequency; If the pressure ratio is higher than a second preset value, the compressor frequency is reduced.

7. The method according to claim 6, characterized in that: The first specified numerical range is between 4:1 and 6:1, the first preset value is 4:1, and the second preset value is 6:

1.

8. The method according to claim 7, characterized in that: Also includes: Detect refrigerant leakage signals in real time.

9. The method according to claim 8, characterized in that: Also includes: After receiving the refrigerant leakage signal, the buzzer of the indoor unit where the refrigerant leakage occurs will beep continuously for 5 seconds.

10. A multi-connected air conditioner refrigerant leakage treatment device, characterized in that: include: a cooling mode switching unit, configured to switch the multi-connected air conditioning system to a cooling mode after receiving a refrigerant leakage signal if the multi-connected air conditioning system is not currently operating in a cooling mode; A first refrigerant leakage control strategy determining unit, configured to determine a first refrigerant leakage control strategy according to the number of indoor units currently turned on, wherein the first refrigerant leakage control strategy includes closing an electronic expansion valve of an indoor unit where refrigerant leakage occurs; The first refrigerant leakage control unit is used to control the indoor units in the multi-connected air-conditioning system according to the first refrigerant leakage control strategy to achieve control of refrigerant leakage.

11. A multi-connected air conditioning system, characterized in that: A refrigerant leakage controller is included, wherein the refrigerant leakage controller includes: at least one processor and at least one memory; The memory stores executable instructions of the processor; The processor is configured to execute the multi-split air conditioner refrigerant leakage processing as described in any one of claims 1-9.

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