Air conditioning system

Abstract

Disclosed is an air conditioning system. The air conditioning system comprises an indoor unit, an outdoor unit and a shut-off device. The shut-off device comprises a first shut-off pipeline, a second shut-off pipeline and a pressure relief pipeline. The first shut-off pipeline is connected to a first refrigerant pipeline between the indoor unit and the outdoor unit, and is configured to close or open the first refrigerant pipeline. The second shut-off pipeline is connected to a second refrigerant pipeline between the indoor unit and the outdoor unit, and is configured to close or open the second refrigerant pipeline. One of the first shut-off pipeline and the second shut-off pipeline is closed and the other is opened to deliver a refrigerant from one of the indoor unit and the outdoor unit to the other, and the pressure relief pipeline is connected between the first shut-off pipeline and the second shut-off pipeline, a pressure relief valve is provided on the pressure relief pipeline, and the pressure relief pipeline is configured to direct a high-pressure refrigerant in a refrigerant pipeline between the indoor unit and the outdoor unit to a compressor of the air conditioning system so as to perform pressure relief protection on the air conditioning system.

Description

Air conditioning system

[0001] This application claims priority to Chinese patent application No. 202410108659.2 filed on January 25, 2024; priority to Chinese patent application No. 202420189871.1 filed on January 25, 2024; priority to Chinese patent application No. 202420188563.7 filed on January 25, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the technical field of air conditioning, and in particular to an air conditioning system. Background Art

[0003] Refrigerants such as R32 used in air-conditioning systems have low flammability. If a leak occurs during use, accidents are likely to occur if the concentration is too high. Usually, a cut-off device is installed in the refrigerant pipeline. The cut-off device is configured to recover the refrigerant after leakage from the indoor unit and to cut off the refrigerant in the gas and liquid pipelines, thereby reducing the amount of refrigerant that spreads to the living space after leakage, thereby reducing hidden dangers.

[0004] Summary of the Invention

[0005] In one aspect, an air conditioning system is provided. The air conditioning system includes an indoor unit, an outdoor unit, and a shutoff device. The shutoff device includes a first shutoff line and a second shutoff line. The first shutoff line is connected to a first refrigerant line between the indoor unit and the outdoor unit and is configured to close or open the first refrigerant line. The second shutoff line is connected to a second refrigerant line between the indoor unit and the outdoor unit and is configured to close or open the second refrigerant line. One of the first shutoff line and the second shutoff line is closed, while the other is opened, to transfer refrigerant from one of the indoor unit and the outdoor unit to the other. The shutoff device also includes a pressure relief line. The pressure relief line is connected between the first shutoff line and the second shutoff line and is provided with a pressure relief valve. The pressure relief line is configured to direct high-pressure refrigerant in the refrigerant line between the indoor unit and the outdoor unit to the compressor of the air conditioning system to provide pressure relief protection for the air conditioning system.

[0006] On the other hand, an air conditioning system is provided. The air conditioning system includes an indoor unit, an outdoor unit, and a shutoff device. An indoor heat exchanger is provided in the indoor unit. An outdoor heat exchanger and a compressor are provided in the outdoor unit. The shutoff device includes a first shutoff line, a second shutoff line, and a pressure relief line. The first shutoff line is connected to the first refrigerant line between the indoor heat exchanger and the outdoor heat exchanger and is configured to close or open the first refrigerant line. The second shutoff line is connected to the second refrigerant line between the indoor heat exchanger and the compressor and is configured to close or open the second refrigerant line. The pressure relief line is connected between the first shutoff line and the second shutoff line and is provided with a pressure relief valve. The pressure relief line is configured to direct the high-pressure refrigerant in the first refrigerant line to the compressor to provide pressure relief protection for the air conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] FIG1 is a structural diagram of a cutting device according to some embodiments;

[0008] FIG2 is another structural diagram of a cutting device according to some embodiments;

[0009] FIG3 is an exploded view of a cutting device according to some embodiments;

[0010] FIG4 is another exploded view of a cutting device according to some embodiments;

[0011] FIG5 is a structural diagram of an electrical appliance box according to some embodiments;

[0012] FIG6 is a structural diagram of the main body of the cutting device without the cover according to some embodiments;

[0013] FIG7 is an exploded view of a housing body according to some embodiments;

[0014] FIG8 is another exploded view of a housing body according to some embodiments;

[0015] FIG9 is a structural diagram of a first cutoff line, a second cutoff line, and a pressure relief line according to some embodiments;

[0016] FIG10 is another structural diagram of a first shutoff line, a second shutoff line, and a pressure relief line according to some embodiments;

[0017] FIG11 is a structural diagram of a first shut-off pipeline according to some embodiments;

[0018] FIG12 is a structural diagram of a second shut-off line according to some embodiments;

[0019] FIG13 is a structural diagram of a heat preservation portion, a shutoff pipeline, and a pressure relief pipeline according to some embodiments;

[0020] FIG14 is another structural diagram of a heat preservation portion, a shutoff pipeline, and a pressure relief pipeline according to some embodiments;

[0021] FIG15 is another structural diagram of a heat preservation portion, a shutoff pipeline, and a pressure relief pipeline according to some embodiments;

[0022] FIG16 is a structural diagram of a heat-insulating main body according to some embodiments;

[0023] FIG17 is a schematic diagram illustrating the working principle of an air conditioning system according to some embodiments;

[0024] FIG18 is a schematic diagram illustrating the working principle of an air conditioning system during cooling according to some embodiments;

[0025] FIG19 is a schematic diagram illustrating the operating principle of an air conditioning system according to some embodiments when cooling is performed and refrigerant leakage occurs indoors;

[0026] FIG20 is a flow chart of the air-conditioning system shown in FIG19 when cooling is performed and refrigerant leakage occurs on the indoor side;

[0027] FIG21 is a schematic diagram illustrating a working principle of a cutoff device for pressure relief protection when the air-conditioning system is in cooling mode and the indoor unit is turned off according to some embodiments;

[0028] FIG22 is a flow chart showing a cutoff device performing pressure relief protection when the air-conditioning system shown in FIG21 is in cooling mode and the indoor unit is turned off;

[0029] FIG23 is another schematic diagram illustrating the working principle of the cutoff device performing pressure relief protection when the air-conditioning system is in cooling mode and the indoor unit is turned off according to some embodiments;

[0030] FIG24 is another flow chart of the cutoff device performing pressure relief protection when the air-conditioning system shown in FIG23 is in cooling mode and the indoor unit is turned off;

[0031] FIG25 is a schematic diagram illustrating the operating principle of an air conditioning system during heating according to some embodiments;

[0032] FIG26 is a schematic diagram illustrating the operating principle of an air conditioning system according to some embodiments when heating is performed and refrigerant leakage occurs indoors;

[0033] FIG27 is a schematic diagram of a shutoff device in a multi-split air conditioning system according to some embodiments;

[0034] FIG28 is another schematic diagram of a shutoff device in a multi-split air conditioning system according to some embodiments. DETAILED DESCRIPTION

[0035] The following will be combined with the accompanying drawings to clearly and completely describe some embodiments of the present disclosure. Obviously, the embodiments described are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present disclosure.

[0036] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and its other forms, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open and inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" are intended to indicate that the particular features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the particular features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0037] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0038] When describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. The term "connected" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. The term "coupled" indicates that two or more components are in direct physical or electrical contact. The term "coupled" or "communicatively coupled" may also refer to two or more components that are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0039] “At least one of A, B and C” has the same meaning as “at least one of A, B or C” and both include the following combinations of A, B and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B and C.

[0040] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0041] The use of "adapted to" or "configured to" herein is intended to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0042] As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of deviation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0043] As used herein, "parallel", "perpendicular", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within an acceptable deviation range, wherein the acceptable deviation range is as determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity can also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality can be, for example, that the difference between the two equals is less than or equal to 5% of either one.

[0044] The current cut-off device has a relatively simple function and can only cut off the refrigerant between the indoor unit and the outdoor unit. The existing cut-off device also has the following shortcomings:

[0045] (1) When the pressure in the refrigerant pipeline of the air-conditioning system rises and exceeds the bearing pressure of the pipeline, it is easy to cause the pipeline to rupture and refrigerant leakage. In this case, the cut-off device cannot provide corresponding pressure relief protection. Therefore, the air-conditioning system needs to be equipped with an independent pressure relief protection module;

[0046] (2) The refrigerant pipeline of the cut-off device will produce condensation. Without anti-condensation design, the condensation can easily come into contact with the electrical components of the cut-off device, thereby reducing the reliability of the electrical components.

[0047] This embodiment discloses an air conditioning system, including an outdoor unit 20 and at least one indoor unit 10. The air conditioning system utilizes a compressor 24, a condenser, an expansion valve, and an evaporator to perform a refrigeration cycle. The refrigeration cycle involves a series of processes, including compression, condensation, expansion, and evaporation, to cool or heat an indoor space.

[0048] Low-temperature, low-pressure refrigerant enters compressor 24, which compresses it into high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, releasing heat into the surrounding environment through the condensation process.

[0049] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to compressor 24. The evaporator achieves a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material being cooled. Throughout this cycle, the air conditioner regulates the temperature of the indoor space.

[0050] The outdoor unit 20 is equipped with an outdoor heat exchanger 21, a compressor 24, an outdoor throttling device 22, an outdoor fan 23, a four-way valve 25, a liquid storage tank 26, etc., and the indoor unit 10 is equipped with an indoor heat exchanger 11, an indoor throttling valve, and an indoor fan 13, etc.

[0051] The indoor heat exchanger 11 and the outdoor heat exchanger 21 function as a condenser or an evaporator. When the indoor heat exchanger 11 functions as a condenser, the air conditioning system functions as a heater in heating mode, and when the indoor heat exchanger 11 functions as an evaporator, the air conditioning system functions as a cooler in cooling mode.

[0052] The air conditioning system in this embodiment further includes a cutoff device 50 . FIG. 1 to FIG. 16 are schematic structural diagrams of the cutoff device 50 , and FIG. 17 to FIG. 26 are schematic diagrams of the application principle of the cutoff device 50 in the air conditioning system.

[0053] The shutoff device 50 is disposed between the indoor unit 10 and the outdoor unit 20, specifically between the indoor throttling device 12 and the outdoor throttling device 22. The indoor unit 10 and the outdoor unit 20 are connected to the inlet and outlet of the shutoff device 50 via refrigerant piping. The shutoff device 50 can be installed between the outdoor unit 20 and the indoor unit 10 depending on the site conditions. It is typically installed outside the room, but it can also be installed indoors.

[0054] The shutoff device 50 includes a shutoff line and a pressure relief line 130. The shutoff line is provided on the refrigerant line between the indoor unit 10 and the outdoor unit 20 and is configured to shut off or conduct the refrigerant line, thereby implementing a refrigerant shutoff function. The pressure relief line 130 is configured to implement a pressure relief protection function.

[0055] 9 and 17 , a first refrigerant pipe 30 and a second refrigerant pipe 40 are provided between the indoor unit 10 and the outdoor unit 20 for transporting refrigerant. The indoor throttling device 12 and the outdoor throttling device 22 are provided on the first refrigerant pipe 30 .

[0056] The shutoff line includes a first shutoff line 110 and a second shutoff line 120. The first shutoff line 110 is connected to the first refrigerant line 30 between the indoor unit 10 and the outdoor unit 20 and is configured to close or open the first refrigerant line 30. Specifically, the first shutoff line 110 is connected between the indoor heat exchanger 11 and the outdoor heat exchanger 21, or in other words, between the indoor throttling device 12 and the outdoor throttling device 22.

[0057] The first cutoff line 110 is turned on or off by a first switch 114. The first switch 114 is configured to control the first cutoff line 110 to be turned on or off.

[0058] The second shutoff line 120 is connected to the second refrigerant line 40 between the indoor unit 10 and the outdoor unit 20 and is configured to close or open the second refrigerant line 40. Specifically, the second shutoff line 120 is connected between the indoor unit 10 and the compressor 24.

[0059] The second cutoff line 120 is turned on / off by the second switch 124. The second switch 124 is configured to control the first cutoff line 110 to be turned on or off.

[0060] One of the first shutoff line 110 and the second shutoff line 120 is closed, and the other is opened, so as to transport the refrigerant from one of the indoor unit 10 and the outdoor unit 20 to the other.

[0061] The pressure relief line 130 is connected between the first shut-off line 110 and the second shut-off line 120. A pressure relief valve 131 is provided on the pressure relief line 130. The pressure relief line 130 is configured to guide the high-pressure refrigerant in the refrigerant line between the indoor unit 10 and the outdoor unit 20 to the compressor 24 of the air-conditioning system to provide pressure relief protection for the air-conditioning system.

[0062] The first end of the pressure relief line 130 is connected to the refrigerant line between the first switch 114 and the indoor unit 10 , that is, the first end of the pressure relief line 130 is connected between the first switch 114 and the indoor throttling device 12 .

[0063] The second end of the pressure relief line 130 is connected to the refrigerant line between the second switch 124 and the outdoor unit 20 , that is, the second end of the pressure relief line 130 is connected between the second switch 124 and the compressor 24 .

[0064] When the air conditioning system is operating normally, as shown in FIG18 , the indoor unit 10 and the outdoor unit 20 operate normally. At this time, the first switch 114 and the second switch 124 are open, the pressure relief valve 131 is closed, the first shutoff line 110 and the second shutoff line 120 are in a conducting state, the pressure relief line 130 is closed, and the first refrigerant line 30 and the second refrigerant line 40 are conducting. The refrigerant flowing out of the compressor 24 flows sequentially through the outdoor heat exchanger 21, the outdoor throttling device 22, the first shutoff line 110, the indoor throttling device 12, the indoor heat exchanger 11, the second shutoff line 120, the liquid storage tank 26, and the compressor 24, completing a circulation flow.

[0065] When the air-conditioning system is cooling, if a leak occurs on the indoor unit 10 side, refer to Figures 19 and 20. In this state, if it is not detected and handled in time, an accident is likely to occur. The present air-conditioning system cuts off the indoor unit 10 and the outdoor unit 20 through the cut-off device 50, and guides the refrigerant on the indoor unit 10 side to the compressor 24 on the outdoor unit 20 side. Specifically, the present air-conditioning system detects the refrigerant through the refrigerant sensor 14 arranged on the indoor unit 10 side. The refrigerant sensor 14 transmits the leakage signal to the controller of the indoor unit 10. The controller of the indoor unit 10 uses the communication between the outdoor unit 20 and the indoor unit 10 to transmit the detection signal to the controller of the outdoor unit 20 and the control end of the cut-off device 50. The first switch 114 is closed, and the first cut-off line 110 is controlled to be closed, thereby blocking the refrigerant from continuing to flow to the indoor unit 10 side. The pressure relief valve 131 is closed, and the pressure relief line is closed. 130 is closed, and the second switch 124 is opened, so that the second shut-off pipe 120 is connected. The outdoor unit 20 receives the refrigerant leakage signal and runs the refrigerant recovery mode. The compressor 24 continues to run, and the refrigerant on the indoor unit 10 side is sucked into the compressor 24, compressed and recovered and stored on the outdoor unit 20 side. When the refrigerant recovery running time of the compressor 24 is completed, the control end of the shut-off device 50 controls the first shut-off pipe 110 and the second shut-off pipe 120 to be closed, and the compressor 24 stops working at the same time, notifying and waiting for the refrigerant leakage fault to be handled.

[0066] It should be noted that, according to actual conditions, the preset running time of the compressor 24 is T.

[0067] The controller includes a processor. The processor may include a central processing unit (CPU), a microprocessor (Microprocessor), or an application-specific integrated circuit (ASIC), and may be configured to perform corresponding operations described in the controller when the processor executes a program stored in a non-transitory computer-readable medium coupled to the controller.

[0068] 20 , when the air conditioning system is powered on, ie starts ( S10 ), the controller is configured to perform steps S11 to S19 .

[0069] S11 , the indoor unit 10 and the outdoor unit 20 operate normally, and the compressor 24 is running.

[0070] S12 , at this time, the first switch element 114 and the second switch element 124 are opened, and the pressure relief valve 131 is closed.

[0071] S13, determine whether the refrigerant sensor 14 detects refrigerant; if so, execute S14; if not, execute S11.

[0072] S14: If it is determined that there is refrigerant, close the first switch 114.

[0073] S15, refrigerant recovery mode, compressor 24 operates.

[0074] S16: Determine whether the compressor operation time is greater than or equal to T; if so, execute S17; if not, execute S15.

[0075] S17: The first cut-off pipeline 110 and the second cut-off pipeline 120 are closed, and the compressor 24 stops working.

[0076] S18: Notify and wait for refrigerant leakage fault processing.

[0077] S19, End. When the air conditioning system is operating normally, referring to FIG. 25 , the indoor unit 10 and the outdoor unit 20 operate normally. At this time, the first switch 114 and the second switch 124 are open, the pressure relief valve 131 is closed, the first shutoff line 110 and the second shutoff line 120 are in a conducting state, the pressure relief line 130 is closed, and the first refrigerant line 30 and the second refrigerant line 40 are conducting. The refrigerant flowing out of the compressor 24 flows sequentially through the second shutoff line 120, the indoor heat exchanger 11, the indoor throttling device 12, the first shutoff line 110, the outdoor throttling device 22, the outdoor heat exchanger 21, the liquid storage tank 26, and the compressor 24, completing a circulation flow.

[0078] When the air-conditioning system is heating, if a leak occurs on the indoor unit 10 side, refer to Figure 25. In this state, if it is not detected and handled in time, an accident is likely to occur. The present air-conditioning system cuts off the indoor unit 10 and the outdoor unit 20 through the cut-off device 50, and guides the refrigerant on the indoor unit 10 side to the compressor 24 on the outdoor unit 20 side. Specifically, the present air-conditioning system detects the refrigerant through the refrigerant sensor 14 arranged on the indoor unit 10 side. The refrigerant sensor 14 transmits the leakage signal to the controller of the indoor unit 10. The controller of the indoor unit 10 uses the communication between the outdoor unit 20 and the indoor unit 10 to transmit the detection signal to the controller of the outdoor unit 20 and the control end of the cut-off device 50. The second switch 124 is closed, and the second cut-off line 120 is controlled to be closed, thereby blocking the refrigerant from continuing to flow to the indoor unit 10 side. The pressure relief valve 131 is closed, and the pressure relief line is closed. 130 is closed, and the first switch 114 is opened, so that the first shut-off pipe 110 is connected. The outdoor unit 20 receives the refrigerant leakage signal and runs the refrigerant recovery mode. The compressor 24 continues to run, and the refrigerant on the indoor unit 10 side is sucked into the compressor 24, compressed and recovered and stored on the outdoor unit 20 side. When the refrigerant recovery running time of the compressor 24 is completed, the control end of the shut-off device 50 controls the first shut-off pipe 110 and the second shut-off pipe 120 to be closed, and the compressor 24 stops working at the same time, notifying and waiting for the refrigerant leakage fault to be handled.

[0079] The air-conditioning system detects refrigerant leakage faults and closes the refrigerant gas and liquid pipelines through the cut-off device 50, completely blocking the refrigerant from continuing to flow to the indoor unit 10 side and causing a refrigerant leakage accident, and recovers the refrigerant to the outdoor unit 20, thus solving the hidden danger of large-scale leakage of flammable and explosive refrigerants such as R32 and R290.

[0080] When the cut-off device 50 is applied to the air-conditioning system, a set of cut-off devices 50 can be used to achieve complete isolation between the indoor unit 10 side and the outdoor unit 20 side. When either the indoor unit 10 or the outdoor unit 20 needs to be repaired or parts replaced, the refrigerant can be transported to the side that does not require maintenance, and the refrigerant pipeline connecting the indoor unit 10 and the outdoor unit 20 can be cut off, thereby effectively preventing refrigerant leakage on the maintenance side and reducing the probability of accidents.

[0081] Considering that in different working modes of the air-conditioning system, as the environment changes, the high-pressure refrigerant pressure increases and there is a problem of system pipeline rupture and leakage, the air-conditioning system simultaneously performs high-pressure pressure relief protection through the cut-off device 50 to solve the above hidden dangers.

[0082] One embodiment of pressure relief protection for the air conditioning system using the shutoff device 50 is shown in Figures 21 and 22. At this time, the air conditioning system is in cooling mode, with the indoor unit 10, outdoor unit 20, and compressor 24 operating according to normal settings. The first switch 114 and the second switch 124 are normally open, and the pressure relief valve 131 is closed. In other words, the first shutoff line 110 and the second shutoff line 120 are connected, and the pressure relief line 130 is closed. During the cooling operation of the air conditioning system, if the user turns off the indoor unit 10, the indoor throttling device 12 will also be closed. In this state, high-pressure refrigerant will be sealed in the refrigerant pipeline from the outdoor unit 20 to the indoor throttling device 12. As the external environment changes, such as temperature increases, the pressure of the sealed refrigerant will increase and exceed the pipeline's bearing pressure, thereby causing pipeline rupture and refrigerant leakage. When the pressure Pa1 in the liquid seal pipeline is greater than the opening pressure Pa2 of the pressure relief valve 131, the pressure relief valve 131 opens to provide pressure relief protection for the high-pressure end, and the high-pressure refrigerant flows to the compressor 24 through the pressure relief pipeline 130. When the pressure drops to the closing pressure Pa3 of the pressure relief valve 131, the pressure relief valve 131 closes. This cycle protects the system pipeline and prevents refrigerant leakage.

[0083] 22 , in some embodiments, the difference from the steps executed by the controller in FIG. 20 above is that, after step S12 , the controller does not execute steps S13 to S18 , but is configured to execute steps S21 to S25 .

[0084] S21: The indoor unit 10 is turned off and the indoor throttling device 12 is closed.

[0085] S22. Determine whether the pressure Pa1 in the liquid seal pipeline is greater than the opening pressure Pa2 of the pressure relief valve 131; if so, execute S23; if not, execute S21.

[0086] S23, the pressure relief valve 131 is opened.

[0087] S24. Determine whether the pressure Pa1 in the liquid seal pipeline is less than or equal to the closing pressure Pa3 of the pressure relief valve 131; if so, execute S25; if not, execute S23.

[0088] S25, the pressure relief valve 131 is closed.

[0089] A second embodiment of pressure relief protection for the air conditioning system using the shutoff device 50 is shown in Figures 23 and 24. At this time, the air conditioning system is in cooling mode, with the indoor unit 10, outdoor unit 20, and compressor 24 operating according to normal settings. The first switch 114 and the second switch 124 are normally open, and the pressure relief valve 131 is closed. In other words, the first shutoff line 110 and the second shutoff line 120 are connected, while the pressure relief line 130 is closed. During air conditioning operation, when the user turns off the indoor unit 10, the indoor throttling device 12 is simultaneously closed. In this state, if a refrigerant leak occurs on the indoor unit 10 side, the system will close the first switch 114 according to the operating mode shown in Figure 19. At this time, high-pressure refrigerant will be sealed in the pipeline between the first switch 114 and the indoor throttling device 12. As the external environment changes, such as temperature increases, the pressure of the sealed refrigerant will increase and exceed the pipeline's bearing pressure, causing the pipeline to rupture and a refrigerant leak. When the liquid seal pipeline pressure Pa1 value is greater than the opening pressure Pa2 of the pressure relief valve 131, the pressure relief valve 131 opens to provide pressure relief protection for the high-pressure end, and the high-pressure refrigerant flows to the compressor 24 through the pressure relief pipeline 130. When the pressure drops to the closing pressure Pa3 of the pressure relief valve 131, the pressure relief valve 131 will close. This cycle protects the system pipeline and prevents refrigerant leakage.

[0090] Referring to FIG. 24 , in some embodiments, the controller differs from the steps executed by the controller described in FIG. 22 in that, between steps S21 and S22 , the controller is further configured to execute steps S13 and S14 . The shutoff device 50 of this embodiment implements refrigerant line shutoff and pressure relief protection functions via a first shutoff line 110 , a second shutoff line 120 , and a pressure relief line 130 . The device has a compact structure and integrated multi-functions. Based on the different operating states of the air conditioning system, the device controls the reasonable opening or closing of the first shutoff line 110 , the second shutoff line 120 , and the pressure relief line 130 to achieve refrigerant line shutoff or high-pressure refrigerant pressure relief protection, thereby preventing refrigerant leakage and improving the operational reliability of the air conditioning system.

[0091] In some embodiments, as shown in FIG. 10 to FIG. 12 , a first filter 115 is provided on the first shut-off line 110 , and a second filter 125 is provided on the second shut-off line 120 , which are configured to filter impurities in the system.

[0092] There are two first filters 115 , which are disposed on both sides of the first switch 114 . There are two second filters 125 , which are disposed on both sides of the second switch 124 .

[0093] 17 , one end of the pressure relief line 130 is connected between the first switch 114 and one of the first filters 115, which is located near the indoor unit 10. The other end of the pressure relief line 130 is connected between the second switch 124 and one of the second filters 125, which is located near the outdoor unit 20.

[0094] In some embodiments, referring to FIG. 1 to FIG. 4 , the shutoff device 50 includes a shutoff device body 100 and an electrical appliance box 200 .

[0095] The shutoff device body 100 includes a housing 140, which is configured to install a first shutoff line 110, a second shutoff line 120, and a pressure relief line 130. Both ends of the first shutoff line 110 and the second shutoff line 120 extend from the housing 140 to connect to an external refrigerant line.

[0096] The electrical box 200 includes a box body 210 , in which a control board 220 is disposed. The control board 220 is configured to control the opening and closing of the first switch element 114 , the second switch element 124 , and the pressure relief valve 131 .

[0097] The shutoff device body 100 is connected side by side with the electrical box 200, meaning that the housing 140 and the box body 210 are connected side by side. This allows the refrigerant piping and the control board 220 to be installed in separate compartments. This separates the refrigerant piping and the control board 220, preventing condensed water from the refrigerant piping in the housing 140 from contacting the control board 220 and causing abnormalities such as a short circuit on the control board 220. This helps improve the operational reliability of the air conditioning system.

[0098] The separate design of the shutoff device body 100 and the electrical box 200 also facilitates assembly of the shutoff device 50. During installation, the shutoff device body 100 and the electrical box 200 are assembled separately. Specifically, the first shutoff line 110, the second shutoff line 120, and the pressure relief line 130 are installed into the housing 140, the control board 220 is installed into the box body 210, and then the shutoff device body 100 and the electrical box 200 are connected side by side.

[0099] In some embodiments, a first connection portion 214 is provided on a side wall of the electrical box 200, and a second connection portion 148 is provided on two opposing side walls of the housing 140. The first connection portion 214 selectively connects to the second connection portion 148 on one side of the housing 140. In other words, the electrical box 200 can be assembled from both sides to accommodate different installation scenarios.

[0100] In a specific embodiment, referring to Figures 3 and 5, the first connecting portion 214 is a hook, and hooks are respectively provided at the two upper corners of one side of the electrical box 200. Correspondingly, bayonet holes are provided on the two opposite side walls of the shell 140. By hanging the hook into the bayonet hole, the electrical box 200 can be assembled to the cutting device body 100, which is convenient for installation.

[0101] In some embodiments, the box body 210 of the electrical box 200 includes a first box body 211 and a second box body 212 , and the first box body 211 and the second box body 212 are buckled and connected.

[0102] In some embodiments, a first wiring opening 213 is provided on the side wall of the electrical box 200, and the first wiring opening 213 and the first connecting portion 214 are provided on the same side. Correspondingly, a second wiring opening 146 is provided on the two opposite side walls of the shell 140. When the electrical box 200 is assembled to the side of the cut-off device body 100, the first wiring opening 213 and the second wiring opening 146 are opposite to each other, which facilitates wiring between the electrical box 200 and the cut-off device body 100.

[0103] In some embodiments, when the refrigerant flows through the first shut-off line 110, the second shut-off line 120, and the pressure relief line 130, condensation may occur on these refrigerant lines. To solve this problem, referring to Figures 6 and 13 to 16, this embodiment provides an insulation part 300 in the shell 140. The insulation part 300 may be a foam part, etc. The first shut-off line 110, the second shut-off line 120, and the pressure relief line 130 are wrapped by the insulation part 300 to avoid condensation on these lines.

[0104] The insulation part 300 is placed in the inner cavity of the shell 140 and is adapted to the inner cavity of the shell 140, that is, the insulation part 300 is fixed in the inner cavity of the shell 140. In this way, the insulation part 300 not only plays a role in insulating the refrigerant pipeline, but also plays a role in fixing the refrigerant pipeline.

[0105] In some embodiments, a groove structure is formed on the insulation part 300 and is configured for the routing of the first shut-off line 110, the second shut-off line 120, and the pressure relief line 130. The first shut-off line 110, the second shut-off line 120, and the pressure relief line 130 are routed through the groove structure, so that the insulation part 300 wraps the first shut-off line 110, the second shut-off line 120, and the pressure relief line 130, and at the same time also serves as a limit for these lines.

[0106] In some embodiments, referring to Figures 13 to 16 , the insulation part 300 includes an insulation main body 310 and an insulation cover part 320 . A groove structure is provided on the insulation main body 310 , and the insulation cover part 320 is connected to the insulation main body 310 to cover the groove structure.

[0107] A groove structure is dug at the corresponding position of the insulation main body 310. The groove structure is a concave structure with one side open to facilitate the installation of the first shut-off pipeline 110, the second shut-off pipeline 120, and the pressure relief pipeline 130. Then, the insulation cover part 320 is installed on the insulation main body 310 to seal the opening of the groove structure, that is, to limit the first shut-off pipeline 110, the second shut-off pipeline 120, and the pressure relief pipeline 130 to the corresponding groove structure, thereby achieving all-round wrapping and limiting of these refrigerant pipelines.

[0108] The split design of the heat-insulating main body 310 and the heat-insulating cover plate 320 facilitates the installation of the refrigerant pipeline and achieves all-round wrapping and positioning of the refrigerant pipeline.

[0109] In some embodiments, the groove structure is provided on two opposite outer surfaces of the insulation main body 310. Specifically, a first groove structure 311 is provided on one side of the insulation main body 310, and the first shut-off pipe 110 is provided in the first groove structure 311. A second groove structure 312 is provided on the other opposite side of the insulation main body 310, and the second shut-off pipe 120 is provided in the second groove structure 312. A third groove structure 313 is provided between the first groove structure 311 and the second groove structure 312, and the pressure relief pipe 130 is provided in the third groove structure 313.

[0110] By arranging the first groove structure 311 and the second groove structure 312 on two opposite side surfaces of the insulation main body 310 to separate the first shut-off pipeline 110 and the second shut-off pipeline 120, on the one hand, it can effectively avoid heat exchange between the two refrigerants when the refrigerants flow through the first shut-off pipeline 110 and the second shut-off pipeline 120; on the other hand, it is convenient to install the first shut-off pipeline 110 and the second shut-off pipeline 120 from different sides of the insulation main body 310; in addition, the insulation cover plate part 320 has two, one insulation cover plate part 320 is configured to cover the first groove structure 311, and the other insulation cover plate part 320 is configured to cover the second groove structure 312, so as to reliably wrap and limit the first shut-off pipeline 110 and the second shut-off pipeline 120.

[0111] The pressure relief pipe 130 is routed from above the heat-insulating main body 310 , which facilitates the installation of the pressure relief pipe 130 .

[0112] In some embodiments, the shell 140 includes a shell body 141 and a cover 142 , the heat-insulating portion 300 is disposed in the shell body 141 , and the cover 142 is disposed on the top of the shell body 141 .

[0113] The first switch element 114, the second switch element 124, and the pressure relief valve 131 are exposed from the top of the heat-insulating main body 310. The ends of the first and second shutoff lines 110, 120 extend from the sides of the heat-insulating main body 310. Pipe outlets 145 are provided on opposite sides of the housing body 141, and the ends of the first and second shutoff lines 110, 120 extend from the corresponding pipe outlets 145.

[0114] In some embodiments, both ends of the first disconnected pipeline 110 and the second disconnected pipeline 120 pass through the pipe opening 145, and the sections of the first disconnected pipeline 110 and the second disconnected pipeline 120 passing through the pipe opening 145 are covered with a thermal insulation member 150, as shown in FIG9. Most of the sections of the first disconnected pipeline 110 and the second disconnected pipeline 120 are located within the thermal insulation portion 300, while the sections of the ends extending out of the thermal insulation portion 300 are wrapped with the thermal insulation member 150. On the one hand, this insulates the sections extending out of the thermal insulation portion to prevent condensation; on the other hand, the thermal insulation member 150 is located within the pipe opening 145, preventing the sections extending out of the first disconnected pipeline 110 and the second disconnected pipeline 120 from hard contact with the pipe opening 145, thereby protecting the pipelines.

[0115] 7 and 8 , end plates 143 are respectively provided at opposite ends of the shell body 141 . The height of the end plates 143 is lower than that of the shell body. A first notch 1431 is provided on the top of the end plates 143 .

[0116] A side plate 144 is provided above the end plate 143 . A second notch 1441 is provided at the bottom of the side plate 144 . The first notch 1431 and the second notch 1441 face each other to form a pipe opening 145 for the first and second cutoff pipes 110 and 120 to pass through.

[0117] During installation, the side panels 144 and the cover 142 are not installed first. First, the heat preservation part 300 together with the shut-off pipeline and the pressure relief pipeline 130 are installed into the shell body 141. At this time, the protruding end parts of the first shut-off pipeline 110 and the second shut-off pipeline 120 fall from top to bottom to the first notch 1431 and rest in place; then the side panels 144 are installed, and the first notch 1431 and the second notch 1441 are directly opposite each other, thereby limiting the protruding end parts of the first shut-off pipeline 110 and the second shut-off pipeline 120; finally, the cover 142 is installed.

[0118] In some embodiments, a connecting portion 147 is provided on the side plate 144, and the cutting device body 100 is installed to a desired installation position through the connecting portion 147. The connecting portion 147 can be a hook structure, etc., and this embodiment does not impose any specific restrictions.

[0119] In some embodiments, the first disconnect pipe 110 and the second disconnect pipe 120 are bent and routed on the heat-insulating main body 310. In other words, the first disconnect pipe 110 and the second disconnect pipe 120 have a bent structure, and correspondingly, the first groove structure 311 and the second groove structure 312 are also bent groove structures. The first disconnect pipe 110 is bent and routed along the first groove structure 311, and the second disconnect pipe 120 is bent and routed along the second groove structure 312.

[0120] The first shut-off line 110 has a Z-shaped structure, including a first shut-off line section 111, a first shut-off line section 2 112, and a first shut-off line section 3 113, which are connected in sequence. The first shut-off line section 2 112 is connected between the height distance between the first shut-off line section 111 and the first shut-off line section 3 113. The first shut-off line section 111 and the first shut-off line section 3 113 extend horizontally, while the first shut-off line section 2 112 extends vertically. The first switch 114 is provided at the bend intersection of the first shut-off line section 2 112 and the first shut-off line section 3 113, so that the first switch 114 can be arranged upward to be exposed from the top of the heat-insulating main body 310. The first shut-off line section 111 and the first shut-off line section 3 113 are each provided with a first filter 115.

[0121] The second shut-off line 120 also has a Z-shaped structure, comprising a sequentially connected second shut-off line section 121, a second shut-off line section 122, and a second shut-off line section 123. The second shut-off line section 122 is connected between the height distance between the second shut-off line section 121 and the second shut-off line section 123. The second shut-off line section 121 and the second shut-off line section 123 extend horizontally, while the second shut-off line section 122 extends vertically. A second switch 124 is disposed at the bend and intersection of the second shut-off line section 122 and the second shut-off line section 123, so that the second switch 124 can be positioned upward to be exposed from the top of the heat-insulating main body 310. A second filter 125 is provided on each of the second shut-off line section 121 and the second shut-off line section 123.

[0122] The bent piping structure of the first cut-off pipe 110 and the second cut-off pipe 120, on the one hand, enables the first switch member 114 and the second switch member 124 to be exposed from the top of the heat-insulating main body 310; on the other hand, it also helps to improve the piping stability of the first cut-off pipe 110 and the second cut-off pipe 120 in the heat-insulating part 300, thereby preventing the first cut-off pipe 110 and the second cut-off pipe 120 from moving left and right or up and down in the heat-insulating part 300.

[0123] In some embodiments, the pressure relief line 130 is connected between the first cut-off line 110 and the second cut-off line 120 in a bent structure. The first cut-off line 110 and the second cut-off line 120 form a routing area configured for the pressure relief line 130 to bend and route.

[0124] Specifically, a routing area for the pressure relief line 130 is formed above the first disconnect line section 111 and the second disconnect line section 121. Correspondingly, a third groove structure 313 is provided within the insulation body to accommodate the curved section of the pressure relief line 130. The third groove structure 313 is located on the same side as the first groove structure 311 and communicates with the first groove structure 311. A portion of the pressure relief line 130 is accommodated within the third groove structure 313, while the remaining portion is routed from above the insulation body 310, extending to the other side of the insulation body 310 to connect with the second disconnect line 120.

[0125] In some embodiments, the installation process of the intercepting device 50 is as follows:

[0126] Assemble the first shut-off line 110 , the second shut-off line 120 , and the pressure relief line 130 to form a line assembly;

[0127] Install the pipe assembly onto the insulation body 310 from top to bottom;

[0128] Install the insulation cover 320 to the left and right sides of the insulation main body 310 to limit the pipeline assembly to the insulation main body 310;

[0129] Install the heat preservation part 300 together with the pipeline assembly into the shell body 141. The protruding ends of the first cut-off pipeline 110 and the second cut-off pipeline 120 fall from top to bottom to the first notches 1431 on the top of the left and right end plates 143 of the shell body 141.

[0130] Install the side plate 144 onto the end plate 143 so that the second notch 1441 at the bottom of the side plate 144 is aligned with the first notch 1431 on the corresponding side to limit the protruding ends of the first cutoff line 110 and the second cutoff line 120;

[0131] Install the cover 142 onto the top of the shell body 141;

[0132] The electric box 200 is mounted to the side of the case body 141 .

[0133] In some embodiments, the shutoff device is applied to a multi-split air conditioning system. Referring to Figures 27 and 28 , the multi-split air conditioning system includes an outdoor unit 20 and multiple indoor units 10. A first refrigerant pipeline and a second refrigerant pipeline form a loop between the outdoor unit 20 and the outdoor unit 10. The first refrigerant pipeline includes a first refrigerant main line 31 and multiple first refrigerant branch lines 32. The second refrigerant pipeline includes a second refrigerant main line 41 and multiple second refrigerant branch lines 42. The outdoor unit 20 is connected to the first refrigerant main line 31 and the second refrigerant main line 41, and the indoor unit 10 is connected to the first refrigerant branch line 32 and the second refrigerant branch line 42. The indoor throttling device 12 is provided on the first refrigerant branch line 32, and the outdoor throttling device 22 is provided on the first refrigerant main line 31.

[0134] FIG27 and FIG28 are an embodiment of a multi-split air conditioning system, which includes an outdoor unit 20 and three indoor units 10, where the three indoor units 10 are respectively denoted as indoor unit 10a, indoor unit 10a, and indoor unit 10a.

[0135] The multi-split air conditioning system includes at least one shutoff device 50. Figure 27 illustrates the principle of using one shutoff device 50 in a multi-split air conditioning system, and Figure 28 illustrates the principle of using two shutoff devices 50 in a multi-split air conditioning system. The arrangement of multiple indoor units 10 and multiple shutoff devices 50 is not limited to those shown in Figures 27 and 28 ; various arrangements are possible based on user needs and are not specifically limited in this embodiment.

[0136] The shutoff device 50 includes a shutoff line, which is disposed on the refrigerant line between the indoor unit 10 and the outdoor unit 20. The shutoff line is configured to shut off or open the refrigerant line, thereby implementing a refrigerant shutoff function. Specifically, the shutoff line is connected to the first refrigerant main line 31 and the second refrigerant main line 41; and / or to the first refrigerant branch line 32 and the second refrigerant branch line 42. The shutoff line is configured to close or open the refrigerant line, thereby transferring refrigerant from one of the indoor unit 10 and the outdoor unit 20 to the other.

[0137] When the shutoff pipe of the shutoff device 50 is connected to the first refrigerant main line 31 and the second refrigerant main line 41 , the shutoff device 50 can simultaneously shut off the refrigerant between the outdoor unit 20 and the plurality of indoor units 10 , as shown in FIG. 27 .

[0138] That is, the multi-split air-conditioning system in Figure 27 is provided with a shut-off device 50, which is provided between the first refrigerant main line 31 and the second refrigerant main line 41. The shut-off device 50 can shut off the refrigerant of the outdoor unit 20 and the three indoor units 10 at the same time.

[0139] When the shut-off pipe of the shut-off device 50 is connected to the first refrigerant branch pipe 32 and the second refrigerant branch pipe 42, the shut-off device can shut off the refrigerant between the outdoor unit 20 and the indoor unit 10 where the shut-off device is located, thereby realizing the separate shut-off of the refrigerant in the indoor unit 10, such as the shut-off device 50a in Figure 28.

[0140] For example, the multi-split air conditioning system in Figure 28 is equipped with two shutoff devices 50, designated as shutoff device 50A and shutoff device 50a. Shutoff device 50A is located between the first refrigerant main line 31 and the second refrigerant main line 41. Shutoff device 50A can simultaneously shut off refrigerant from the outdoor unit 20 and three indoor units 10. Shutoff device 50a is configured to shut off refrigerant from the outdoor unit 20 and one of the indoor units 10 (e.g., indoor unit 10a). Shutoff device 50a is located on the first refrigerant branch line 32a and the second refrigerant branch line 42a connected to the indoor unit 10a. The shutoff lines include a first shutoff line 110 and a second shutoff line 120. The first shutoff line 110 is connected to the first refrigerant line between the indoor unit 10 and the outdoor unit 20 and is configured to close or open the first refrigerant line. Specifically, the first shut-off pipe 110 is connected between the indoor heat exchanger 11 and the outdoor heat exchanger 21 , or in other words, the first shut-off pipe 110 is connected between the indoor throttling device 12 and the outdoor throttling device 22 .

[0141] Taking Figure 27 as an example, if a leak occurs on the indoor unit 10 side during cooling in the air conditioning system, an accident may easily occur if this condition is not detected and handled in a timely manner. This air conditioning system uses a shutoff device 50 to simultaneously shut off the refrigerant from the outdoor unit 20 and multiple indoor units 10, directing the refrigerant from the multiple indoor units 10 to the compressor 24 on the outdoor unit 20 side. Specifically, the air-conditioning system detects the refrigerant through the refrigerant sensor 14 arranged on the side of the indoor unit 10. The refrigerant sensor 14 transmits the leakage signal to the controller of the indoor unit 10. The controller of the indoor unit 10 uses the communication between the outdoor unit 20 and the indoor unit 10 to transmit the detection signal to the controller of the outdoor unit 20 and the control end of the shut-off device 50. The first switch 114 is closed, and the first shut-off pipe 110 is controlled to be closed, blocking the refrigerant from continuing to flow to the indoor unit 10 side. The pressure relief valve 131 is closed, the pressure relief pipe 130 is closed, and the second switch 124 is opened to connect the second shut-off pipe 120. The outdoor unit 20 receives the refrigerant leakage signal and operates in the refrigerant recovery mode. The compressor 24 continues to operate, and the refrigerant on the indoor unit 10 side is sucked into the compressor 24, compressed and recovered, and stored on the outdoor unit 20 side. When the refrigerant recovery operation time of the compressor 24 is completed, the shut-off device 50 The control end controls the first cut-off pipe 110 and the second cut-off pipe 120 to be closed, and the compressor 24 stops working, notifying and waiting for the refrigerant leakage fault to be handled.

[0142] Taking Figure 27 as an example, when the air-conditioning system is heating, if a leak occurs on the indoor unit 10 side, in this state, if it is not detected and handled in time, an accident is likely to occur. This air-conditioning system cuts off the outdoor unit 20 from multiple indoor units 10 through the cut-off device 50, and guides the refrigerant on the multiple indoor units 10 side to the compressor 24 on the outdoor unit 20 side. Specifically, this air-conditioning system detects the refrigerant through the refrigerant sensor 14 arranged on the indoor unit 10 side. The refrigerant sensor 14 transmits the leakage signal to the controller of the indoor unit 10. The controller of the indoor unit 10 uses the communication between the outdoor unit 20 and the indoor unit 10 to transmit the detection signal to the controller of the outdoor unit 20 and the control end of the cut-off device 50. The second switch 124 is closed, and the second cut-off line 120 is controlled to be closed, thereby blocking the refrigerant from continuing to flow to the indoor unit 10 side. The pressure relief valve 131 is closed, and the pressure relief line is closed. 130 is closed, and the first switch 114 is opened, so that the first shut-off pipe 110 is connected. The outdoor unit 20 receives the refrigerant leakage signal and runs the refrigerant recovery mode. The compressor 24 continues to run, and the refrigerant on the indoor unit 10 side is sucked into the compressor 24, compressed and recovered and stored on the outdoor unit 20 side. When the refrigerant recovery running time of the compressor 24 is completed, the control end of the shut-off device 50 controls the first shut-off pipe 110 and the second shut-off pipe 120 to be closed, and the compressor 24 stops working at the same time, notifying and waiting for the refrigerant leakage fault to be handled.

[0143] Taking Figure 28 as an example, when the air conditioner is cooling or heating normally, the first switch element 114A and the second switch element 124A on the shut-off device 50A are normally open and the pressure relief valve 131A is normally closed, and the first switch element 114a and the second switch element 124a on the shut-off device 50a are normally open and the pressure relief valve 131a is normally closed, and the refrigerant circulates between the outdoor unit 20 and multiple outdoor units 10.

[0144] Taking Figure 28 as an example, when the multi-split unit is cooling, if the indoor unit 10a has a refrigerant leak, in this state, if it is not detected and handled in time, an accident is likely to occur. This air-conditioning system cuts off the indoor unit 10a and the outdoor unit 20 through the cut-off device 50a. At this time, the cut-off device 50A conducts the refrigerant pipeline, and guides the refrigerant on the indoor unit 10a side to the compressor 24 on the outdoor unit 20 side. Specifically, this air-conditioning system detects the refrigerant through the refrigerant sensor 14 arranged on the indoor unit 10a side. The refrigerant sensor 14 transmits the leakage signal to the controller of the indoor unit 10a. The controller of the indoor unit 10a uses the communication between the outdoor unit 20 and the indoor unit 10a to transmit the detection signal to the controller of the outdoor unit 20 and the control end of the cut-off device 50a. The first switch 114a is closed, and the first cut-off pipeline 110a is controlled to be closed, thereby blocking the refrigerant from continuing to flow to the indoor unit 10a side. The pressure relief valve 131a is closed, and the pressure relief pipe 131a is closed. The circuit 130a is closed, and the second switch 124a is opened, so that the second shut-off circuit 120a is connected. The outdoor unit 20 receives the refrigerant leakage signal and operates in the refrigerant recovery mode. The compressor 24 continues to operate, and the refrigerant on the indoor unit 10a side is sucked into the compressor 24, compressed and recovered and stored on the outdoor unit 20 side. When the refrigerant recovery operation time of the compressor 24 is completed, the control end of the shut-off device 50a controls the first shut-off circuit 110a and the second shut-off circuit 120a to be closed, and the compressor 24 stops working at the same time, notifying and waiting for the refrigerant leakage fault to be handled.

[0145] The multi-split air-conditioning system detects refrigerant leakage faults and closes the refrigerant gas and liquid pipelines through the cut-off device 50, completely blocking the refrigerant from continuing to flow to the indoor unit 10 side and causing a refrigerant leakage accident, and recovering the refrigerant to the outdoor unit 20, thus solving the hidden danger of large-scale leakage of flammable and explosive refrigerants such as R32 and R290.

[0146] When using the shutoff device 50 in an air conditioning system, at least one shutoff device 50 is installed on both the main refrigerant line and the branch refrigerant line. This not only allows for shutoff of refrigerant in the main refrigerant line, but also allows for shutoff of refrigerant in the branch refrigerant lines as needed. The shutoff device 50 installed in the main refrigerant line simultaneously shuts off refrigerant between the outdoor unit 20 and multiple indoor units 10. The shutoff device 50 installed in the branch refrigerant line individually shuts off refrigerant between the outdoor unit 20 and a target indoor unit 10 (where a refrigerant leak or repair is occurring).

[0147] Considering that in different working modes of the air-conditioning system, as the environment changes, the high-pressure refrigerant pressure increases and there is a problem of system pipeline rupture and leakage, the air-conditioning system simultaneously performs high-pressure pressure relief protection through the cut-off device 50 to solve the above hidden dangers.

[0148] In one embodiment of pressure relief protection for an air conditioning system using a shutoff device 50a, as shown in FIG28 , the air conditioning system is in cooling mode, with multiple indoor units 10, outdoor units 20, and compressor 24 operating according to normal settings. The first shutoff line 110A and the second shutoff line 120A of the shutoff device 50A are open, while the pressure relief line 130A is closed. The first shutoff line 110a and the second shutoff line 120a of the shutoff device 50a are open, while the pressure relief line 130a is closed. During cooling operation, if the user turns off the indoor unit 10a, the indoor throttling device 12a is simultaneously closed. In this state, high-pressure refrigerant is sealed in the refrigerant pipeline from the outdoor unit 20 to the indoor throttling device 12a. As the external environment changes, such as rising temperature, the pressure of the sealed refrigerant increases, exceeding the pipeline's carrying capacity, potentially causing a pipeline rupture and refrigerant leakage. When the pressure Pa1 in the liquid seal pipeline is greater than the opening pressure Pa2 of the pressure relief valve 131a, the pressure relief valve 131a opens to provide pressure relief protection for the high-pressure end, and the high-pressure refrigerant flows to the compressor 24 through the pressure relief pipeline 130a. When the pressure drops to the closing pressure Pa3 of the pressure relief valve 131a, the pressure relief valve 131a closes. This cycle protects the system pipeline and prevents refrigerant leakage.

[0149] In a second embodiment of pressure relief protection for an air conditioning system using a shutoff device 50a, as shown in FIG28 , the air conditioning system is in cooling mode, with multiple indoor units 10, outdoor units 20, and compressor 24 operating according to normal settings. The first shutoff line 110A and the second shutoff line 120A of the shutoff device 50A are open, while the pressure relief line 130A is closed. The first shutoff line 110a and the second shutoff line 120a of the shutoff device 50a are open, while the pressure relief line 130a is closed. During air conditioning operation, if a user turns off the indoor unit 10a, the indoor throttling device 12a is simultaneously closed. In this state, if a refrigerant leak occurs on the indoor unit 10a side, the system will close the first switch 114a. At this time, high-pressure refrigerant will be sealed in the pipeline between the first switch 114a and the indoor throttling device 12a. As the external environment changes, such as rising temperature, the pressure of the sealed refrigerant will increase, exceeding the pipeline's carrying capacity, potentially causing a pipeline rupture and a refrigerant leak. When the liquid seal pipeline pressure Pa1 value is greater than the opening pressure Pa2 of the pressure relief valve 131a, the pressure relief valve 131a opens to provide pressure relief protection for the high-pressure end, and the high-pressure refrigerant flows to the compressor 24 through the pressure relief pipeline 130a. When the pressure drops to the closing pressure Pa3 of the pressure relief valve 131a, the pressure relief valve 131a will close. This cycle protects the system pipeline and prevents refrigerant leakage.

[0150] The shut-off device 50 of this embodiment realizes the functions of refrigerant pipeline shutoff and pressure relief protection through the first shut-off line 110, the second shut-off line 120, and the pressure relief line 130. It has a compact structure and multi-functional integration. According to the different operating states of the air-conditioning system, it controls the reasonable conduction or closure of the first shut-off line 110, the second shut-off line 120, and the pressure relief line 130 to realize the refrigerant pipeline shutoff or the pressure relief protection of the high-pressure refrigerant, avoid refrigerant leakage, and improve the operating reliability of the air-conditioning system.

[0151] Those skilled in the art will understand that the scope of the present invention is not limited to the above specific embodiments, and that certain elements of the embodiments may be modified and replaced without departing from the spirit of the present application. The scope of the present application is limited by the appended claims.

Claims

1. An air conditioning system, comprising: An indoor unit; An outdoor unit; And A cutoff device, comprising: A first cutoff pipeline, connected to a first refrigerant pipeline between the indoor unit and the outdoor unit, and configured to close or conduct the first refrigerant pipeline; A second cutoff pipeline, connected to a second refrigerant pipeline between the indoor unit and the outdoor unit, and configured to close or conduct the second refrigerant pipeline; Wherein, one of the first cutoff pipeline and the second cutoff pipeline is closed and the other is conducted to transport refrigerant from one of the indoor unit and the outdoor unit to the other; Wherein, the cutoff device further comprises: A pressure relief pipeline, connected between the first cutoff pipeline and the second cutoff pipeline, and a pressure relief valve is provided on the pressure relief pipeline, and the pressure relief pipeline is configured to direct the high-pressure refrigerant in the refrigerant pipeline between the indoor unit and the outdoor unit to the compressor of the air conditioning system to perform pressure relief protection on the air conditioning system.

2. The air conditioning system according to claim 1, wherein, A first switch member is provided on the first cutoff pipeline, and the first switch member is configured to control the closing or conducting of the first cutoff pipeline; A second switch member is provided on the second cutoff pipeline, and the second switch member is configured to control the closing or conducting of the second cutoff pipeline; Wherein, the first end of the pressure relief pipeline is connected to the refrigerant pipeline between the first switch member and the indoor unit, and the second end of the pressure relief pipeline is connected to the refrigerant pipeline between the second switch member and the outdoor unit.

3. The air conditioning system according to claim 1 or 2, wherein, The pressure relief pipeline is connected between the first cutoff pipeline and the second cutoff pipeline in a bent structure.

4. The air conditioning system according to claim 3, wherein, The first cutoff pipeline and the second cutoff pipeline have a bent structure, and the two form a routing area for the pressure relief pipeline to bend and route.

5. The air conditioning system according to any one of claims 1 to 4, wherein, The cutoff device comprises: A cutoff device main body, the cutoff device main body includes a housing, the first cutoff pipeline, the second cutoff pipeline and the pressure relief pipeline are arranged in the housing, and both ends of the first cutoff pipeline and both ends of the second cutoff pipeline extend out of the housing to be connected to external refrigerant pipelines; and An electrical box, the electrical box includes a box body, and a control board is arranged in the box body; Wherein, the housing and the box body are connected side by side.

6. The air conditioning system according to claim 5, wherein, A heat insulation part is arranged in the housing, and a groove structure configured for the first cutoff pipeline, the second cutoff pipeline and the pressure relief pipeline to route through is formed on the heat insulation part.

7. The air conditioning system according to claim 6, wherein, The heat insulation part includes a heat insulation main body part and a heat insulation cover plate part, the groove structure is provided on the heat insulation main body part, and the heat insulation cover plate part is connected to the heat insulation main body part to cover the groove structure.

8. The air conditioning system according to claim 7, wherein, One side of the heat preservation main body is provided with a first groove structure, and the first cut-off pipeline is arranged in the first groove structure inside; On the opposite side of the heat preservation main body, there is a second groove structure, and the second cut-off pipeline is arranged in the second groove structure; A third groove structure is arranged between the first groove structure and the second groove structure, and the pressure relief pipeline is arranged in the third groove structure.

9. The air conditioning system according to claim 6, wherein a first switch is provided on the first cut-off pipeline, and the first switch is configured to control the closing or opening of the first cut-off pipeline; a second switch is provided on the second cut-off pipeline, and the second switch is configured to control the closing or opening of the second cut-off pipeline; wherein, the first switch, the second switch, and the pressure relief valve protrude from the top of the heat preservation part; Both ends of the first cut-off pipeline and both ends of the second cut-off pipeline extend out from the side part of the heat preservation part.

10. An air conditioning system, comprising: an indoor unit, in which an indoor heat exchanger is arranged; an outdoor unit, in which an outdoor heat exchanger and a compressor are arranged; and a cut-off device, comprising: a first cut-off pipeline, connected to the first refrigerant pipeline between the indoor heat exchanger and the outdoor heat exchanger, and configured to close or open the first refrigerant pipeline; a second cut-off pipeline, connected to the second refrigerant pipeline between the indoor heat exchanger and the compressor, and configured to close or open the second refrigerant pipeline; and a pressure relief pipeline, connected between the first cut-off pipeline and the second cut-off pipeline, a pressure relief valve is provided on the pressure relief pipeline, and the pressure relief pipeline is configured to lead the high-pressure refrigerant in the first refrigerant pipeline to the compressor to perform pressure relief protection on the air conditioning system.

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