Air conditioning system

Abstract

The invention discloses an air conditioning system. The air conditioning system comprises an indoor unit, an outdoor unit and a cut-off device. The cut-off device comprises a first cut-off pipeline, a second cut-off pipeline and a pressure relief pipeline. The first cut-off pipeline is connected to the portion, between the indoor unit and the outdoor unit, of the first refrigerant pipeline and is configured to close or open the first refrigerant pipeline. The second cut-off pipeline is connected to the 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 cut-off pipeline and the second cut-off pipeline is closed, the other one of the first cut-off pipeline and the second cut-off pipeline is connected so that refrigerants can be conveyed from one of the indoor unit and the outdoor unit to the other one of the indoor unit and the outdoor unit, the pressure relief pipeline is connected between the first cut-off pipeline and the second cut-off pipeline, and a pressure relief valve is arranged on the pressure relief pipeline. And the pressure relief pipeline is configured to guide a high-pressure refrigerant in the 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

Technical Field

[0001] The present disclosure relates to the technical field of air conditioning, and particularly to an air conditioning system. Background Art

[0002] Refrigerants such as R32 used in air conditioning systems have the characteristic of low flammability. If leakage occurs during use, once the concentration is too high, accidents are likely to occur. Usually, a cut-off device is provided in the refrigerant pipeline. The cut-off device is configured to recover the leaked refrigerant in the indoor unit and cut off the refrigerant in the gas and liquid pipelines, reducing the amount of refrigerant diffused into the living space after leakage to reduce potential hazards. Summary of the Invention

[0003] On the one hand, an air conditioning system is provided. The air conditioning system includes an indoor unit, an outdoor unit, and a cut-off device. The cut-off device includes a first cut-off pipeline and a second cut-off pipeline. The first cut-off pipeline is connected to the first refrigerant pipeline between the indoor unit and the outdoor unit and is configured to close or conduct the first refrigerant pipeline. The second cut-off pipeline is connected to the second refrigerant pipeline between the indoor unit and the outdoor unit and is configured to close or conduct the second refrigerant pipeline. One of the first cut-off pipeline and the second cut-off pipeline is closed and the other is conducted to transport the refrigerant from one of the indoor unit and the outdoor unit to the other. The cut-off device further includes a pressure relief pipeline. The pressure relief pipeline is connected between the first cut-off pipeline and the second cut-off pipeline. A pressure relief valve is provided on the pressure relief pipeline. 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 for pressure relief protection of the air conditioning system.

[0004] On the other hand, an air conditioning system is provided. The air conditioning system includes an indoor unit, an outdoor unit, and a cut-off 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 cut-off device includes a first cut-off pipeline, a second cut-off pipeline, and a pressure relief pipeline. The first cut-off pipeline is connected to the first refrigerant pipeline between the indoor heat exchanger and the outdoor heat exchanger and is configured to close or conduct the first refrigerant pipeline. The second cut-off pipeline is connected to the second refrigerant pipeline between the indoor heat exchanger and the compressor and is configured to close or conduct the second refrigerant pipeline. The pressure relief pipeline is connected between the first cut-off pipeline and the second cut-off pipeline. A pressure relief valve is provided on the pressure relief pipeline. The pressure relief pipeline is configured to direct the high-pressure refrigerant in the first refrigerant pipeline to the compressor for pressure relief protection of the air conditioning system. Description of the Drawings

[0005] Figure 1 A structural diagram of a cut-off device according to some embodiments;

[0006] Figure 2 Another structural diagram of the truncation device according to some embodiments;

[0007] Figure 3 An exploded view of the truncation device according to some embodiments;

[0008] Figure 4 Another exploded view of the truncation device according to some embodiments;

[0009] Figure 5 A structural diagram of the electrical appliance box according to some embodiments;

[0010] Figure 6 A structural diagram of the main body of the truncation device after removing the cover according to some embodiments;

[0011] Figure 7 An exploded view of the shell main body according to some embodiments;

[0012] Figure 8 Another exploded view of the shell main body according to some embodiments;

[0013] Figure 9 A structural diagram of the first truncation pipeline, the second truncation pipeline and the pressure relief pipeline according to some embodiments;

[0014] Figure 10 Another structural diagram of the first truncation pipeline, the second truncation pipeline and the pressure relief pipeline according to some embodiments;

[0015] Figure 11 A structural diagram of the first truncation pipeline according to some embodiments;

[0016] Figure 12 A structural diagram of the second truncation pipeline according to some embodiments;

[0017] Figure 13 A structural diagram of the heat preservation part, the truncation pipeline and the pressure relief pipeline according to some embodiments;

[0018] Figure 14 Another structural diagram of the heat preservation part, the truncation pipeline and the pressure relief pipeline according to some embodiments;

[0019] Figure 15 Another structural diagram of the heat preservation part, the truncation pipeline and the pressure relief pipeline according to some embodiments;

[0020] Figure 16 A structural diagram of the main heat preservation body part according to some embodiments;

[0021] Figure 17 A schematic diagram of the working principle of the air conditioning system according to some embodiments;

[0022] Figure 18 Schematic diagram of the working principle of an air conditioning system during refrigeration according to some embodiments;

[0023] Figure 19 Schematic diagram of the working principle of an air conditioning system during refrigeration and when refrigerant leaks on the indoor side according to some embodiments;

[0024] Figure 20 For Figure 19 Flow chart of the air conditioning system shown during refrigeration and when refrigerant leaks on the indoor side;

[0025] Figure 21 Schematic diagram of a working principle of a cut-off device for pressure relief protection when an air conditioning system is refrigerating and the indoor unit is closed according to some embodiments;

[0026] Figure 22 For Figure 21 Flow chart of a cut-off device for pressure relief protection when the air conditioning system shown is refrigerating and the indoor unit is closed;

[0027] Figure 23 Another schematic diagram of the working principle of a cut-off device for pressure relief protection when an air conditioning system is refrigerating and the indoor unit is closed according to some embodiments;

[0028] Figure 24 For Figure 23 Another flow chart of a cut-off device for pressure relief protection when the air conditioning system shown is refrigerating and the indoor unit is closed;

[0029] Figure 25 Schematic diagram of the working principle of an air conditioning system during heating according to some embodiments;

[0030] Figure 26 Schematic diagram of the working principle of an air conditioning system during heating and when refrigerant leaks on the indoor side according to some embodiments;

[0031] Figure 27 Schematic diagram of a cut-off device in a multi-split air conditioning system according to some embodiments;

[0032] Figure 28 Another schematic diagram of a cut-off device in a multi-split air conditioning system according to some embodiments. Detailed implementation manners

[0033] Next, some embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments provided by the present disclosure fall within the scope of protection of the present disclosure.

[0034] Unless the context otherwise requires, 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 construed in an open, inclusive sense, i.e., "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", etc., are intended to indicate that the specific features, structures, materials, or characteristics related to the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials, or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0035] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present disclosure, unless otherwise specified, the meaning of "a plurality" is two or more.

[0036] 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, "connected" may be a fixed connection, a detachable connection, or integrated; it may be directly connected or indirectly connected through an intermediate medium. The term "coupled" indicates that two or more components have direct physical contact or electrical contact. The term "coupled" or "communicatively coupled" may also mean that two or more components do not have direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content herein.

[0037] "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: only A, only B, only C, 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.

[0038] "A and / or B" includes the following three combinations: only A, only B, and the combination of A and B.

[0039] As used herein, the use of "adapted to" or "configured to" means open and inclusive language that does not exclude devices adapted to or configured to perform additional tasks or steps.

[0040] As used herein, "about", "substantially" or "approximately" includes the recited value and the average value within an acceptable deviation range of the specific value, where the acceptable deviation range is determined by a person of ordinary skill in the art considering the measurement being discussed and the error associated with the measurement of the specific quantity (i.e., the limitations of the measurement system).

[0041] As used herein, "parallel", "perpendicular", "equal" includes the recited situation and situations similar to the recited situation, and the range of the similar situations is within an acceptable deviation range, where the acceptable deviation range is determined by a person of ordinary skill in the art considering the measurement being discussed and the error associated with the measurement of the specific quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallel and approximate parallel, where the acceptable deviation range of approximate parallel can be, for example, within a deviation of 5°; "perpendicular" includes absolute perpendicular and approximate perpendicular, where the acceptable deviation range of approximate perpendicular can also be, for example, within a deviation of 5°. "Equal" includes absolute equality and approximate equality, where the acceptable deviation range of approximate equality can be, for example, that the difference between the two equal values is less than or equal to 5% of either one of them.

[0042] Currently, the function of the cut-off device is relatively single, and it can only achieve the cut-off of the refrigerant between the indoor unit side and the outdoor unit side. The existing cut-off device also has the following deficiencies:

[0043] (1) When the pressure in the refrigerant pipeline of the air-conditioning system rises and exceeds the pipeline bearing pressure, it is easy to cause the pipeline to rupture and refrigerant leakage. In this case, the cut-off device cannot perform corresponding pressure relief protection. Therefore, the air-conditioning system needs to be equipped with an independent pressure relief protection module;

[0044] (2) Condensation will occur in the refrigerant pipeline of the cut-off device, and there is no anti-condensation design. The condensation is easy to contact the electrical components of the cut-off device, reducing the reliability of the use of the electrical components.

[0045] This embodiment discloses an air-conditioning system, including an outdoor unit 20 and at least one indoor unit 10. The air-conditioning system performs the refrigeration cycle of the air conditioner by using a compressor 24, a condenser, an expansion valve and an evaporator. The refrigeration cycle includes a series of processes, involving compression, condensation, expansion and evaporation, for cooling or heating the indoor space.

[0046] The low-temperature and low-pressure refrigerant enters the compressor 24, and the compressor 24 compresses it into a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0047] The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant formed by condensation in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor 24. The evaporator can achieve a refrigeration effect by using the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the whole cycle, the air conditioner can adjust the temperature of the indoor space.

[0048] The outdoor unit 20 is provided 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 provided with an indoor heat exchanger 11, an indoor throttle valve, and an indoor fan 13, etc.

[0049] The indoor heat exchanger 11 and the outdoor heat exchanger 21 are used as condensers or evaporators. When the indoor heat exchanger 11 is used as a condenser, the air-conditioning system serves as a heater in the heating mode, and when the indoor heat exchanger 11 is used as an evaporator, the air-conditioning system serves as a cooler in the cooling mode.

[0050] The air-conditioning system in this embodiment further includes a cut-off device 50. Figures 1 to 16 FIG. is a schematic structural diagram of the cut-off device 50. Figures 17 to 26 FIG. is a schematic diagram of the application principle of the cut-off device 50 on the air-conditioning system.

[0051] The cut-off device 50 is provided 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 cut-off device 50 through refrigerant pipelines. The cut-off device 50 can be installed between the outdoor unit 20 and the indoor unit 10 according to the on-site situation, usually installed outside the indoor room, and of course, it can also be installed indoors.

[0052] The cut-off device 50 includes a cut-off pipeline and a pressure relief pipeline 130. The cut-off pipeline is provided on the refrigerant pipeline between the indoor unit 10 and the outdoor unit 20, and the cut-off pipeline is configured to cut off or conduct the refrigerant pipeline to achieve the refrigerant cut-off function. The pressure relief pipeline 130 is configured to achieve the pressure relief protection function.

[0053] Specifically, referring to Figure 9 and Figure 17, a first refrigerant pipeline 30 and a second refrigerant pipeline 40 are provided between the indoor unit 10 and the outdoor unit 20, which are configured to transport refrigerant. An indoor throttling device 12 and an outdoor throttling device 22 are provided on the first refrigerant pipeline 30.

[0054] The cut-off pipeline includes a first cut-off pipeline 110 and a second cut-off pipeline 120. The first cut-off pipeline 110 is connected to the first refrigerant pipeline 30 between the indoor unit 10 and the outdoor unit 20, and is configured to close or conduct the first refrigerant pipeline 30. Specifically, the first cut-off pipeline 110 is connected between the indoor heat exchanger 11 and the outdoor heat exchanger 21, or rather, the first cut-off pipeline 110 is connected between the indoor throttling device 12 and the outdoor throttling device 22.

[0055] The on / off of the first cut-off pipeline 110 is realized by a first switch member 114. The first switch member 114 is configured to control the closing or conducting of the first cut-off pipeline 110.

[0056] The second cut-off pipeline 120 is connected to the second refrigerant pipeline 40 between the indoor unit 10 and the outdoor unit 20, and is configured to close or conduct the second refrigerant pipeline 40. Specifically, the second cut-off pipeline 120 is connected between the indoor unit 10 and the compressor 24.

[0057] The on / off of the second cut-off pipeline 120 is realized by a second switch member 124. The second switch member 124 is configured to control the closing or conducting of the first cut-off pipeline 110.

[0058] One of the first cut-off pipeline 110 and the second cut-off pipeline 120 is closed and the other is conducted to transport the refrigerant from one of the indoor unit 10 and the outdoor unit 20 to the other.

[0059] A pressure relief pipeline 130 is connected between the first cut-off pipeline 110 and the second cut-off pipeline 120. A pressure relief valve 131 is provided on the pressure relief pipeline 130. The pressure relief pipeline 130 is configured to lead the high-pressure refrigerant in the refrigerant pipeline between the indoor unit 10 and the outdoor unit 20 to the compressor 24 of the air-conditioning system to perform pressure relief protection on the air-conditioning system.

[0060] The first end of the pressure relief pipeline 130 is connected to the refrigerant pipeline between the first switch member 114 and the indoor unit 10, that is, the first end of the pressure relief pipeline 130 is connected between the first switch member 114 and the indoor throttling device 12.

[0061] The second end of the pressure relief pipeline 130 is connected to the refrigerant pipeline between the second switch member 124 and the outdoor unit 20, that is, the second end of the pressure relief pipeline 130 is connected between the second switch member 124 and the compressor 24.

[0062] When the air-conditioning system is normally refrigerating, refer to Figure 18, the indoor unit 10 and the outdoor unit 20 are operating normally. At this time, the first switch member 114 and the second switch member 124 are turned on, the pressure relief valve 131 is closed, the first cut-off pipeline 110 and the second cut-off pipeline 120 are in a conducting state, the pressure relief pipeline 130 is closed, and the first refrigerant pipeline 30 and the second refrigerant pipeline 40 are conducting. The refrigerant flowing out of the compressor 24 sequentially flows through the outdoor heat exchanger 21, the outdoor throttling device 22, the first cut-off pipeline 110, the indoor throttling device 12, the indoor heat exchanger 11, the second cut-off pipeline 120, the liquid storage tank 26 and the compressor 24 to complete a cycle of flow.

[0063] When the air-conditioning system is refrigerating, if a leakage occurs on the indoor unit 10 side, refer to Figure 19 and Figure 20 . In this state, if it is not detected and processed in time, accidents are likely to occur. This 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 refrigerant sensor 14 arranged on the indoor unit 10 side of this air-conditioning system will detect the refrigerant, and 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 member 114 is closed, controlling the first cut-off pipeline 110 to be closed, blocking the refrigerant from continuing to flow to the indoor unit 10 side. The pressure relief valve 131 is closed, and the pressure relief pipeline 130 is closed. The second switch member 124 is turned on, making the second cut-off pipeline 120 conducting. When the outdoor unit 20 receives the refrigerant leakage signal, it operates in the refrigerant recovery mode. The compressor 24 continues to operate, sucking the refrigerant on the indoor unit 10 side into the compressor 24, compressing and recovering and storing it on the outdoor unit 20 side. When the refrigerant recovery operation time of the compressor 24 is completed, the control end of the cut-off device 50 controls the first cut-off pipeline 110 and the second cut-off pipeline 120 to be closed, and at the same time the compressor 24 stops working, notifying and waiting for the refrigerant leakage fault to be processed.

[0064] It should be noted that, according to the actual situation, the preset operating time of the compressor 24 is T.

[0065] The controller includes a processor. The processor may include a Central Processing Unit (CPU), a Microprocessor, and an Application Specific Integrated Circuit (ASIC), and may be configured to perform the corresponding operations described in the controller when the processor executes a program stored in a non-transitory computer-readable medium coupled to the controller.

[0066] Refer to Figure 20, when the air conditioning system is powered on, it starts (S10), and the controller is configured to execute steps S11 to S19.

[0067] S11. The indoor unit 10 and the outdoor unit 20 operate normally, and at this time, the compressor 24 operates.

[0068] S12. At this time, the first switching element 114 and the second switching element 124 are opened, and the pressure relief valve 131 is closed.

[0069] S13. Determine whether the refrigerant sensor 14 detects refrigerant; if so, execute S14; if not, execute S11.

[0070] S14. If it is determined that there is refrigerant, close the first switching element 114.

[0071] S15. Refrigerant recovery mode, the compressor 24 operates.

[0072] S16. Determine whether the operating time of the compressor is greater than or equal to T; if so, execute S17; if not, execute S15.

[0073] S17. The first cut-off pipeline 110 and the second cut-off pipeline 120 are closed, and at the same time, the compressor 24 stops working.

[0074] S18. Notify and wait for the handling of the refrigerant leakage fault.

[0075] S19. End.

[0076] When the air conditioning system is heating normally, refer to Figure 25 , the indoor unit 10 and the outdoor unit 20 operate normally. At this time, the first switching element 114 and the second switching element 124 are opened, the pressure relief valve 131 is closed, the first cut-off pipeline 110 and the second cut-off pipeline 120 are in a conducting state, the pressure relief pipeline 130 is closed, and the first refrigerant pipeline 30 and the second refrigerant pipeline 40 are conducting. The refrigerant flowing out of the compressor 24 flows through the second cut-off pipeline 120, the indoor heat exchanger 11, the indoor throttling device 12, the first cut-off pipeline 110, the outdoor throttling device 22, the outdoor heat exchanger 21, the liquid storage tank 26 and the compressor 24 in sequence to complete a cycle of flow.

[0077] When the air conditioning system is heating, if a leakage occurs on the indoor unit 10 side, refer to Figure 25, in this state, if not detected and processed in time, accidents are likely to occur. This air-conditioning system cuts off the indoor unit 10 from 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 refrigerant sensor 14 arranged on the indoor unit 10 side of this air-conditioning system will detect the refrigerant. 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 this detection signal to the controller of the outdoor unit 20 and the control end of the cut-off device 50. The second switch member 124 is closed, the second cut-off pipeline 120 is closed, blocking the refrigerant from continuing to flow to the indoor unit 10 side. The pressure relief valve 131 is closed, the pressure relief pipeline 130 is closed, and the first switch member 114 is opened, making the first cut-off pipeline 110 conductive. When the outdoor unit 20 receives the refrigerant leakage signal, it operates in the refrigerant recovery mode. The compressor 24 continues to operate, sucking the refrigerant on the indoor unit 10 side into the compressor 24, compressing and recovering it for storage on the outdoor unit 20 side. When the refrigerant recovery operation time of the compressor 24 is completed, the control end of the cut-off device 50 controls the first cut-off pipeline 110 and the second cut-off pipeline 120 to close, and at the same time the compressor 24 stops working, notifies and waits for the refrigerant leakage fault to be processed.

[0078] This air-conditioning system detects the fault of refrigerant leakage, closes the gas and liquid pipelines of the refrigerant through the cut-off device 50, completely blocks the refrigerant from continuing to flow to the indoor unit 10 side and causing refrigerant leakage accidents, realizes the recovery of the refrigerant to the outdoor unit 20, and solves the hidden danger of large leakage of flammable and explosive refrigerants such as R32 and R290.

[0079] When the cut-off device 50 is applied to the air-conditioning system, the indoor unit 10 side and the outdoor unit 20 side can be completely isolated through a set of cut-off device 50. When any one of the indoor unit 10 or the outdoor unit 20 needs to be repaired or replaced with parts, the refrigerant can be transported to the side that does not need to be repaired, and the refrigerant pipeline connecting the indoor unit 10 and the outdoor unit 20 can be cut off, thereby effectively preventing the refrigerant leakage on the repair side and reducing the probability of accidents.

[0080] Considering that under different working modes of the air-conditioning system, with the change of the environment, there is a problem of system pipeline rupture and leakage due to the increase of the high-pressure refrigerant pressure. This air-conditioning system conducts high-pressure pressure relief protection through the cut-off device 50 to solve the above hidden dangers.

[0081] One of the embodiments of conducting pressure relief protection on the air-conditioning system through the cut-off device 50 is as Figure 21 and 22As shown, at this time, the air conditioning system executes the cooling mode, the indoor unit 10, the outdoor unit 20, and the compressor 24 operate according to the normal settings, the first switch 114 and the second switch 124 are normally open, and the pressure relief valve 131 is closed, that is, the first cut-off pipeline 110 and the second cut-off pipeline 120 are connected, and the pressure relief pipeline 130 is closed. During the air conditioning cooling operation, when the user turns off the indoor unit 10, the indoor throttling device 12 will be closed at the same time. In this state, the refrigerant pipeline from the outdoor unit 20 side to the indoor throttling device 12 will be sealed with high-pressure refrigerant. With the changes in the external environment, such as the increase in temperature, the pressure of the liquid-sealed refrigerant will increase and exceed the bearing pressure of the pipeline, thereby causing the pipeline to rupture and the refrigerant leakage accident. When the pressure Pa1 value 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.

[0082] Reference Figure 22 , in some embodiments, with the above Figure 20 The difference between the steps executed by the controller in is that, after step S12, the controller does not execute steps S13 to S18, but is configured to execute steps S21 to S25.

[0083] S21, the indoor unit 10 is turned off and the indoor throttling device 12 is closed.

[0084] 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.

[0085] S23, the pressure relief valve 131 is opened.

[0086] S24, determine whether the pressure Pa1 value 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.

[0087] S25, the pressure relief valve 131 is closed.

[0088] The second embodiment of the air conditioning system being protected from pressure relief by the cut-off device 50 is as follows: Figure 23 and Figure 24As shown, at this time, the air conditioning system is in cooling mode, the indoor unit 10, the outdoor unit 20, and the compressor 24 are 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, that is, the first cut-off pipeline 110 and the second cut-off pipeline 120 are connected, and the pressure relief pipeline 130 is closed. During the operation of the air conditioner, when the user turns off the indoor unit 10, the indoor throttling device 12 will be closed at the same time. In this state, if the refrigerant leaks on the indoor unit 10 side, according to Figure 19 In the operation mode shown, the system will close the first switch 114. At this time, the 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 rises, the pressure of the liquid-sealed refrigerant will increase and exceed the pipeline bearing pressure, thereby causing pipeline rupture and refrigerant leakage accidents. When the liquid-sealed pipeline pressure Pa1 value is greater than the opening pressure Pa2 of the pressure relief valve 131, the pressure relief valve 131 opens to relieve the high-pressure end for pressure relief protection. 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.

[0089] Reference Figure 24 , in some embodiments, with the above Figure 22 The difference between the steps executed by the controller in is that, between steps S21 and S22, the controller is also configured to execute steps S13 to S14.

[0090] The cut-off device 50 of this embodiment realizes the refrigerant pipeline cut-off and pressure relief protection functions through the first cut-off pipeline 110, the second cut-off pipeline 120, and the pressure relief pipeline 130. It has a compact structure and multi-functional integration. According to the different operating states of the air-conditioning system, the first cut-off pipeline 110, the second cut-off pipeline 120, and the pressure relief pipeline 130 are controlled to be reasonably opened or closed to realize the refrigerant pipeline cut-off or the pressure relief protection of the high-pressure refrigerant, avoid refrigerant leakage, and improve the operating reliability of the air-conditioning system.

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

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

[0093] Reference Figure 17, one end of the pressure relief pipeline 130 is connected between the first switching element 114 and one of the first filters 115, and the first filter 115 is arranged on the side close to the indoor unit 10. The other end of the pressure relief pipeline 130 is connected between the second switching element 124 and one of the second filters 125, and the second filter 125 is arranged on the side close to the outdoor unit 20.

[0094] In some embodiments, referring to Figures 1 to 4 , the truncation device 50 includes a truncation device main body 100 and an electric appliance box 200.

[0095] The truncation device main body 100 includes a housing 140, and the housing 140 is configured to install a first truncation pipeline 110, a second truncation pipeline 120, and a pressure relief pipeline 130. Both ends of the first truncation pipeline 110 and both ends of the second truncation pipeline 120 extend out of the housing 140 for connecting with external refrigerant pipelines.

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

[0097] The truncation device main body 100 and the electric appliance box 200 are arranged side by side and connected, that is, the housing 140 and the box body 210 are arranged side by side and connected. In this way, the refrigerant pipeline and the control board 220 are respectively installed in independent spaces, separating the refrigerant pipeline from the control board 220, preventing the condensed water generated by the refrigerant pipeline in the housing 140 from contacting the control board 220 and causing abnormalities such as short circuit of the control board 220, which helps to improve the operation reliability of the air-conditioning system.

[0098] The split design of the truncation device main body 100 and the electric appliance box 200 also facilitates the assembly of the truncation device 50. During installation, the assembly of the truncation device main body 100 and the electric appliance box 200 is completed respectively, that is, the first truncation pipeline 110, the second truncation pipeline 120, and the pressure relief pipeline 130 are installed into the housing 140, the control board 220 is installed into the box body 210, and then the truncation device main body 100 and the electric appliance box 200 are connected side by side.

[0099] In some embodiments, a first connection portion 214 is provided on the side wall of the electric appliance box 200, and second connection portions 148 are respectively provided on two opposite side walls of the housing 140. The first connection portion 214 is selectively connected to the second connection portion 148 on one side of the housing 140. That is, the electric appliance box 200 can be assembled in two opposite directions to adapt to different on-site installation scenarios.

[0100] In a specific embodiment, referring to Figure 3 and Figure 5, the first connecting portion 214 is a hook. Hooks are respectively provided at two upper corners on one side of the electrical box 200. Correspondingly, bayonets are provided on two opposite side walls of the housing 140. By hanging the hooks into the bayonets, the electrical box 200 can be assembled onto the truncation device main 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 snap-connected.

[0102] In some embodiments, a first wire routing opening 213 is provided on the side wall of the electrical box 200, and the first wire routing opening 213 and the first connecting portion 214 are located on the same side. Correspondingly, second wire routing openings 146 are provided on two opposite side walls of the housing 140. When the electrical box 200 is assembled to the side of the truncation device main body 100, the first wire routing opening 213 and the second wire routing opening 146 are aligned, which is convenient for wire routing between the electrical box 200 and the truncation device main body 100.

[0103] In some embodiments, when the refrigerant flows through the first truncation pipeline 110, the second truncation pipeline 120, and the pressure relief pipeline 130, condensation may occur on these refrigerant pipelines. To solve this problem, referring to Figure 6 、 Figures 13 to 16 , in this embodiment, a heat insulation portion 300 is provided in the housing 140. The heat insulation portion 300 can be a foam member or the like. The first truncation pipeline 110, the second truncation pipeline 120, and the pressure relief pipeline 130 are wrapped by the heat insulation portion 300 to prevent condensation from occurring on these pipelines.

[0104] The heat insulation portion 300 is placed in the inner cavity of the housing 140 and is adapted to the inner cavity of the housing 140. That is, the heat insulation portion 300 is fixed in the inner cavity of the housing 140. In this way, the heat insulation portion 300 not only plays a role in heat insulation for the refrigerant pipeline but also plays a role in fixing the refrigerant pipeline.

[0105] In some embodiments, a groove structure configured to allow the first truncation pipeline 110, the second truncation pipeline 120, and the pressure relief pipeline 130 to pass through is formed on the heat insulation portion 300. The first truncation pipeline 110, the second truncation pipeline 120, and the pressure relief pipeline 130 pass through the groove structure, realizing the wrapping of the first truncation pipeline 110, the second truncation pipeline 120, and the pressure relief pipeline 130 by the heat insulation portion 300, and at the same time playing a role in limiting these pipelines.

[0106] In some embodiments, continuing to refer to Figures 13 to 16 , the heat insulation portion 300 includes a heat insulation main body portion 310 and a heat insulation cover portion 320. A groove structure is provided on the heat insulation main body portion 310, and the heat insulation cover portion 320 is connected to the heat insulation main body portion 310 to cover the groove structure.

[0107] A groove structure is dug at a corresponding position of the heat preservation main body 310. The groove structure is a sunken structure with an open side, so as to facilitate the installation and routing of the first cut-off pipeline 110, the second cut-off pipeline 120, and the pressure relief pipeline 130. Then, the heat preservation cover part 320 is installed on the heat preservation main body 310 to cover the open mouth of the groove structure, that is, to limit the routing of the first cut-off pipeline 110, the second cut-off pipeline 120, and the pressure relief pipeline 130 into the corresponding groove structure, so as to achieve the all-round wrapping and limiting of these refrigerant pipelines.

[0108] The split design of the heat preservation main body 310 and the heat preservation cover part 320 facilitates the installation of the refrigerant pipeline, and realizes the all-round wrapping and limiting of the refrigerant pipeline.

[0109] In some embodiments, the groove structure is arranged on two opposite outer side surfaces of the heat preservation main body 310. Specifically, a first groove structure 311 is arranged on one side of the heat preservation main body 310, and the first cut-off pipeline 110 is arranged in the first groove structure 311. A second groove structure 312 is arranged on the opposite side of the heat preservation main body 310, and the second cut-off pipeline 120 is arranged in the second groove structure 312. A third groove structure 313 is arranged between the first groove structure 311 and the second groove structure 312, and the pressure relief pipeline 130 is arranged 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 heat preservation main body 310 to separate the first cut-off pipeline 110 and the second cut-off pipeline 120, on the one hand, it can effectively avoid the heat exchange between the two refrigerant circuits when the refrigerant flows in the first cut-off pipeline 110 and the second cut-off pipeline 120; on the other hand, it is convenient to install the first cut-off pipeline 110 and the second cut-off pipeline 120 from different sides of the heat preservation main body 310; in addition, there are two heat preservation cover parts 320. One heat preservation cover part 320 is configured to cover the first groove structure 311, and the other heat preservation cover part 320 is configured to cover the second groove structure 312, so as to reliably wrap and limit the first cut-off pipeline 110 and the second cut-off pipeline 120.

[0111] The pressure relief pipeline 130 routes from above the heat preservation main body 310, which is convenient for the routing installation of the pressure relief pipeline 130.

[0112] In some embodiments, the housing 140 includes a housing main body 141 and a cover body 142. The heat preservation part 300 is arranged in the housing main body 141, and the cover body 142 is arranged on the top of the housing main body 141.

[0113] The first switch member 114, the second switch member 124, and the pressure relief valve 131 are exposed from the top of the heat preservation main body 310, and both ends of the first cut-off pipeline 110 and both ends of the second cut-off pipeline 120 extend from the side of the heat preservation main body 310. Pipe outlets 145 are respectively provided on opposite sides of the housing main body 141, and both ends of the first cut-off pipeline 110 and both ends of the second cut-off pipeline 120 extend from the corresponding pipe outlets 145.

[0114] In some embodiments, both ends of the first cut-off pipeline 110 and the second cut-off pipeline 120 pass through the pipe outlets 145, and heat preservation members 150 are sleeved on the pipe sections of the first cut-off pipeline 110 and the second cut-off pipeline 120 passing through the pipe outlets 145, as Figure 9 shown. Most of the pipe sections of the first cut-off pipeline 110 and the second cut-off pipeline 120 are located within the heat preservation part 300, and for the parts of the ends extending out of the heat preservation part 300, they are wrapped with the heat preservation members 150. On the one hand, the extending parts of the ends are heat-preserved to avoid condensation; on the other hand, the heat preservation members 150 are located within the pipe outlets 145 to prevent the extending parts of the ends of the first cut-off pipeline 110 and the second cut-off pipeline 120 from making hard contact with the pipe outlets 145, playing a role in protecting the pipelines.

[0115] In some embodiments, referring to Figure 7 and Figure 8 , end plates 143 are respectively provided at opposite ends of the housing main body 141. The height of the end plates 143 is lower than the height of the housing main body, and a first notch 1431 is provided at the top of the end plates 143.

[0116] Side plates 144 are arranged above the end plates 143, and a second notch 1441 is provided at the bottom of the side plates 144. The first notch 1431 and the second notch 1441 are aligned to form the pipe outlet 145 for the first cut-off pipeline 110 and the second cut-off pipeline 120 to pass through.

[0117] During installation, the side plates 144 and the cover body 142 are not installed first. First, the heat preservation part 300 together with the cut-off pipelines and the pressure relief pipeline 130 are loaded into the housing main body 141. At this time, the extending parts of the ends of the first cut-off pipeline 110 and the second cut-off pipeline 120 fall from top to bottom to the first notch 1431 and are abutted in place; then the side plates 144 are installed. The first notch 1431 and the second notch 1441 are vertically aligned, thereby limiting the extending parts of the ends of the first cut-off pipeline 110 and the second cut-off pipeline 120; finally, the cover body 142 is installed.

[0118] In some embodiments, connection parts 147 are provided on the side plates 144, and the cut-off device main body 100 is installed at the required installation position through the connection parts 147. The connection parts 147 can be in the form of structures such as hooks, and no specific limitation is made in this embodiment.

[0119] In some embodiments, the first cut-off pipeline 110 and the second cut-off pipeline 120 are bent and routed on the heat-insulating main body 310. That is to say, the first cut-off pipeline 110 and the second cut-off pipeline 120 have a bent structure. Correspondingly, the first groove structure 311 and the second groove structure 312 are also bent groove structures. The first cut-off pipeline 110 is bent and routed along the first groove structure 311, and the second cut-off pipeline 120 is bent and routed along the second groove structure 312.

[0120] The first cut-off pipeline 110 has a Z-shaped structure, including a first cut-off pipeline section 111, a second cut-off pipeline section 112, and a third cut-off pipeline section 113 that are connected in sequence. The second cut-off pipeline section 112 is connected between the height distances of the first cut-off pipeline section 111 and the third cut-off pipeline section 113. The first cut-off pipeline section 111 and the third cut-off pipeline section 113 extend in the horizontal direction, and the second cut-off pipeline section 112 extends in the vertical direction. The first switch 114 is provided at the bent intersection of the second cut-off pipeline section 112 and the third cut-off pipeline section 113 so that the first switch 114 can be arranged upward to be exposed from the top of the heat-insulating main body 310. First filters 115 are respectively provided on the first cut-off pipeline section 111 and the third cut-off pipeline section 113.

[0121] The second cut-off pipeline 120 also has a Z-shaped structure, including a first cut-off pipeline section 121, a second cut-off pipeline section 122, and a third cut-off pipeline section 123 that are connected in sequence. The second cut-off pipeline section 122 is connected between the height distances of the first cut-off pipeline section 121 and the third cut-off pipeline section 123. The first cut-off pipeline section 121 and the third cut-off pipeline section 123 extend in the horizontal direction, and the second cut-off pipeline section 122 extends in the vertical direction. The second switch 124 is provided at the bent intersection of the second cut-off pipeline section 122 and the third cut-off pipeline section 123 so that the second switch 124 can be arranged upward to be exposed from the top of the heat-insulating main body 310. Second filters 125 are respectively provided on the first cut-off pipeline section 121 and the third cut-off pipeline section 123.

[0122] The bent routing structure of the first cut-off pipeline 110 and the second cut-off pipeline 120, on the one hand, can expose the first switch 114 and the second switch 124 from the top of the heat-insulating main body 310; on the other hand, it also helps to improve the routing stability of the first cut-off pipeline 110 and the second cut-off pipeline 120 in the heat-insulating part 300, and avoid the first cut-off pipeline 110 and the second cut-off pipeline 120 from moving left and right or up and down in the heat-insulating part 300.

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

[0124] Specifically, a pipeline routing area for the pressure relief pipeline 130 to route is formed above a section 111 of the first cut-off pipeline and a section 121 of the second cut-off pipeline. Correspondingly, a third groove structure 313 configured to accommodate the bent pipe section of the pressure relief pipeline 130 is provided inside the heat preservation main body. The third groove structure 313 and the first groove structure 311 are provided on the same side and communicate with the first groove structure 311. A part of the pressure relief pipeline 130 is accommodated in the third groove structure 313, and the other part routes above the heat preservation main body part 310 so as to extend to the other side of the heat preservation main body part 310 to be connected to the second cut-off pipeline 120.

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

[0126] Assemble the first cut-off pipeline 110, the second cut-off pipeline 120, and the pressure relief pipeline 130 into a pipeline assembly;

[0127] Install the pipeline assembly onto the heat preservation main body part 310 from top to bottom;

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

[0129] Install the heat preservation part 300 together with the pipeline assembly into the shell main body 141, and the protruding parts of the ends of the first cut-off pipeline 110 and the second cut-off pipeline 120 fall from top to bottom to the top of the first notch 1431 of the left and right side end plates 143 of the shell main body 141;

[0130] Install the side plate 144 onto the end plate 143, and the second notch 1441 at the bottom of the side plate 144 is aligned with the corresponding first notch 1431 to limit the protruding parts of the ends of the first cut-off pipeline 110 and the second cut-off pipeline 120;

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

[0132] Install the electrical box 200 onto the side of the shell main body 141.

[0133] In some embodiments, the cut-off device is applied to a multi-connected air-conditioning system. Refer to Figure 27 and Figure 28, The multi-split air conditioning system includes an outdoor unit 20 and multiple indoor units 10. A circuit is formed between the outdoor unit 20 and the indoor units 10 through a first refrigerant pipeline and a second refrigerant pipeline. The first refrigerant pipeline includes a first refrigerant main pipeline 31 and multiple first refrigerant branch pipelines 32. The second refrigerant pipeline includes a second refrigerant main pipeline 41 and multiple second refrigerant branch pipelines 42. The outdoor unit 20 is connected to the first refrigerant main pipeline 31 and the second refrigerant main pipeline 41, and the indoor units 10 are connected to the first refrigerant branch pipelines 32 and the second refrigerant branch pipelines 42. An indoor throttling device 12 is provided on the first refrigerant branch pipeline 32, and an outdoor throttling device 22 is provided on the first refrigerant main pipeline 31.

[0134] Figure 27 and Figure 28 is an embodiment of the multi-split air conditioning system, which includes an outdoor unit 20 and three indoor units 10, and 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 cutoff device 50. Figure 27 is a schematic diagram of the application principle of a cutoff device 50 on the multi-split air conditioning system. Figure 28 is a schematic diagram of the application principle of two cutoff devices 50 on the multi-split air conditioning system. The arrangement manners of the multiple indoor units 10 and the multiple cutoff devices 50 are not limited to Figure 27 and Figure 28 , and there can be various arrangement forms according to the user's usage requirements, and no specific limitation is made in this embodiment.

[0136] The cutoff device 50 includes a cutoff pipeline. The cutoff pipeline is provided on the refrigerant pipeline between the indoor unit 10 and the outdoor unit 20, and the cutoff pipeline is configured to cut off or conduct the refrigerant pipeline to achieve the refrigerant cutoff function. Specifically, the cutoff pipeline is connected to the first refrigerant main pipeline 31 and the second refrigerant main pipeline 41; and / or connected to the first refrigerant branch pipeline 32 and the second refrigerant branch pipeline 42, and the cutoff pipeline is configured to close or conduct the refrigerant pipeline to transport the refrigerant from one of the indoor unit 10 and the outdoor unit 20 to the other.

[0137] When the cutoff pipeline of the cutoff device 50 is connected to the first refrigerant main pipeline 31 and the second refrigerant main pipeline 41, the cutoff device 50 can simultaneously cut off the refrigerant between the outdoor unit 20 and the multiple indoor units 10. Refer to Figure 27 .

[0138] That is to say, Figure 27 in the multi-split air conditioning system, a cutoff device 50 is provided. The cutoff device 50 is provided between the first refrigerant main pipeline 31 and the second refrigerant main pipeline 41, and the refrigerant between the outdoor unit 20 and the three indoor units 10 can be simultaneously cut off through the cutoff device 50.

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

[0140] For example Figure 28 In the multi-connected air-conditioning system in

[0141] Take Figure 27 as an example. When the air-conditioning system is cooling, if a leak occurs on the indoor unit 10 side, in this state, if it is not detected and processed in time, accidents are likely to occur. In this air-conditioning system, the cut-off device 50 cuts off the refrigerant between the outdoor unit 20 and multiple indoor units 10 at the same time, and guides the refrigerant on the multiple indoor unit 10 sides to the compressor 24 on the outdoor unit 20 side. Specifically, the refrigerant sensor 14 arranged on the indoor unit 10 side of this air-conditioning system will detect the refrigerant, and 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 closes, controlling the first cut-off pipeline 110 to close, blocking the refrigerant from continuing to flow to the indoor unit 10 side. The pressure relief valve 131 closes, and the pressure relief pipeline 130 closes. The second switch 124 opens, making the second cut-off pipeline 120 conductive. When the outdoor unit 20 receives the refrigerant leakage signal, it runs the refrigerant recovery mode, and the compressor 24 continues to operate, sucking the refrigerant on the indoor unit 10 side into the compressor 24, compressing and recovering and storing it on the outdoor unit 20 side. When the refrigerant recovery operation time of the compressor 24 is completed, the control end of the cut-off device 50 controls the first cut-off pipeline 110 and the second cut-off pipeline 120 to close, and at the same time the compressor 24 stops working, notifying and waiting for the refrigerant leakage fault to be processed.

[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 processed in time, accidents are likely to occur. This air-conditioning system cuts off the outdoor unit 20 from multiple indoor units 10 through the cutoff device 50, and guides the refrigerant on the multiple indoor unit 10 sides to the compressor 24 on the outdoor unit 20 side. Specifically, the refrigerant sensor 14 arranged on the indoor unit 10 side of this air-conditioning system will detect the refrigerant, and 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 this detection signal to the controller of the outdoor unit 20 and the control end of the cutoff device 50. The second switch member 124 is closed, the second cutoff pipeline 120 is closed, blocking the refrigerant from continuing to flow to the indoor unit 10 side. The pressure relief valve 131 is closed, the pressure relief pipeline 130 is closed, and the first switch member 114 is opened, making the first cutoff pipeline 110 conductive. When the outdoor unit 20 receives the refrigerant leakage signal, it operates in the refrigerant recovery mode. The compressor 24 continues to operate, sucking the refrigerant on the indoor unit 10 side into the compressor 24, compressing and recovering and storing it on the outdoor unit 20 side. When the refrigerant recovery operation time of the compressor 24 is completed, the control end of the cutoff device 50 controls the first cutoff pipeline 110 and the second cutoff pipeline 120 to close, and at the same time the compressor 24 stops working, notifying and waiting for the refrigerant leakage fault to be processed.

[0143] Taking Figure 28 as an example, when the air conditioner is normally cooling or heating, the first switch member 114A and the second switch member 124A on the cutoff device 50A are normally open, the pressure relief valve 131A is normally closed, the first switch member 114a and the second switch member 124a on the cutoff device 50a are normally open, 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 28For example, when the multi-connected unit is refrigerating, if the refrigerant leaks from the indoor unit 10a, in this state, if it is not detected and processed in time, accidents are likely to occur. In this air-conditioning system, the indoor unit 10a and the outdoor unit 20 are cut off by the cutoff device 50a. At this time, the cutoff 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, the refrigerant sensor 14 arranged on the indoor unit 10a side of this air-conditioning system will detect the refrigerant. 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 cutoff device 50a. The first switch member 114a is closed, the first cutoff pipeline 110a is closed, blocking the refrigerant from continuing to flow to the indoor unit 10a side. The pressure relief valve 131a is closed, the pressure relief pipeline 130a is closed. The second switch member 124a is opened, so that the second cutoff pipeline 120a is conducted. When the outdoor unit 20 receives the refrigerant leakage signal, it operates in the refrigerant recovery mode. The compressor 24 continues to operate, sucks the refrigerant on the indoor unit 10a side into the compressor 24, compresses and recovers and stores it on the outdoor unit 20 side. When the refrigerant recovery operation time of the compressor 24 is completed, the control end of the cutoff device 50a controls the first cutoff pipeline 110a and the second cutoff pipeline 120a to be closed. At the same time, the compressor 24 stops working, notifies and waits for the refrigerant leakage fault to be processed.

[0145] Through the fault detection of refrigerant leakage, this multi-connected unit air-conditioning system closes the gas and liquid pipelines of the refrigerant through the cutoff device 50, completely blocking the refrigerant from continuing to flow to the indoor unit 10 side and causing refrigerant leakage accidents, realizing the recovery of the refrigerant to the outdoor unit 20, and solving the hidden danger of a large amount of leakage of flammable and explosive refrigerants such as R32 and R290.

[0146] When applying the cutoff device 50 to the air-conditioning system, at least one set of cutoff device 50 is arranged on the refrigerant main pipeline and the refrigerant branch pipeline, which can not only meet the refrigerant cutoff requirements of the refrigerant main pipeline, but also meet the refrigerant cutoff requirements of the refrigerant branch pipeline as needed. The cutoff device 50 arranged on the refrigerant main pipeline realizes the simultaneous cutoff of the refrigerant between the outdoor unit 20 and multiple indoor units 10. The cutoff device 50 arranged on the refrigerant branch pipeline realizes the separate cutoff of the refrigerant between the outdoor unit 20 and the target indoor unit 10 (where refrigerant leakage occurs or maintenance is required).

[0147] Considering that under different working modes of the air-conditioning system, with the change of the environment, there is a problem of system pipeline rupture and leakage due to the increase of the high-pressure refrigerant pressure. This air-conditioning system conducts high-pressure pressure relief protection through the cutoff device 50 to solve the above hidden dangers.

[0148] One of the embodiments of the pressure relief protection of the air-conditioning system through the cutoff device 50a, taking Figure 28For example, when the air-conditioning system operates in the cooling mode, multiple indoor units 10, an outdoor unit 20, and a compressor 24 operate according to normal settings. The first cutoff pipeline 110A and the second cutoff pipeline 120A of the cutoff device 50A are conducted, and the pressure relief pipeline 130A is closed. The first cutoff pipeline 110a and the second cutoff pipeline 120a of the cutoff device 50a are conducted, and the pressure relief pipeline 130a is closed. During the cooling operation of the air conditioner, when the user turns off the indoor unit 10a, the indoor throttling device 12a will also be turned off. In this state, the refrigerant pipeline between the outdoor unit 20 side and the indoor throttling device 12a will be liquid-sealed with high-pressure refrigerant. With the change of the external environment, such as the increase in temperature, the pressure of the liquid-sealed refrigerant will increase and exceed the pipeline bearing pressure, which will cause the pipeline to rupture and refrigerant leakage accidents. When the pressure Pa1 value in the liquid-sealed pipeline is greater than the opening pressure Pa2 of the pressure relief valve 131a, the pressure relief valve 131a opens to relieve the pressure of the high-pressure end. The high-pressure refrigerant flows through the pressure relief pipeline 130a to the compressor 24. When the pressure drops to the closing pressure Pa3 of the pressure relief valve 131a, the pressure relief valve 131a closes. Such a cycle protects the system pipeline to avoid refrigerant leakage.

[0149] The second embodiment of the pressure relief protection for the air-conditioning system by the cutoff device 50a is as follows Figure 28 For example, when the air-conditioning system operates in the cooling mode, multiple indoor units 10, an outdoor unit 20, and a compressor 24 operate according to normal settings. The first cutoff pipeline 110A and the second cutoff pipeline 120A of the cutoff device 50A are conducted, and the pressure relief pipeline 130A is closed. The first cutoff pipeline 110a and the second cutoff pipeline 120a of the cutoff device 50a are conducted, and the pressure relief pipeline 130a is closed. During the operation of the air conditioner, when the user turns off the indoor unit 10a, the indoor throttling device 12a will also be turned off. In this state, if refrigerant leakage occurs on the indoor unit 10a side, the system will close the first switch member 114a. At this time, the pipeline between the first switch member 114a and the indoor throttling device 12a will be liquid-sealed with high-pressure refrigerant. With the change of the external environment, such as the increase in temperature, the pressure of the liquid-sealed refrigerant will increase and exceed the pipeline bearing pressure, which will cause the pipeline to rupture and refrigerant leakage accidents. When the pressure Pa1 value in the liquid-sealed pipeline is greater than the opening pressure Pa2 of the pressure relief valve 131a, the pressure relief valve 131a opens to relieve the pressure of the high-pressure end. The high-pressure refrigerant flows through the pressure relief pipeline 130a to the compressor 24. When the pressure drops to the closing pressure Pa3 of the pressure relief valve 131a, the pressure relief valve 131a will close. Such a cycle protects the system pipeline to avoid refrigerant leakage.

[0150] The cutoff device 50 of this embodiment realizes the functions of cutting off the refrigerant pipeline and relieving pressure protection through the first cutoff pipeline 110, the second cutoff pipeline 120, and the pressure relief pipeline 130. It has a compact structure and integrated multi-functions. According to different operating states of the air-conditioning system, it controls the reasonable conduction or closing of the first cutoff pipeline 110, the second cutoff pipeline 120, and the pressure relief pipeline 130 to achieve the cutoff of the refrigerant pipeline or the pressure relief protection of 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 disclosure scope of the present invention is not limited to the above specific embodiments, and certain elements of the embodiments can be modified and replaced without departing from the spirit of this application. The scope of this application is limited by the appended claims.

Claims

1. An air conditioning system, comprising: An indoor unit; An outdoor unit; And A cut-off device, comprising: A first cut-off 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 cut-off 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 cut-off pipeline and the second cut-off 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 cut-off device further comprises: A pressure relief pipeline, connected between the first cut-off pipeline and the second cut-off pipeline, and a pressure relief valve is provided on the pressure relief pipeline. The pressure relief pipeline is configured to lead 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 cut-off pipeline, and the first switch member is configured to control the closing or conducting of the first cut-off pipeline; A second switch member is provided on the second cut-off pipeline, and the second switch member is configured to control the closing or conducting of the second cut-off 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 cut-off pipeline and the second cut-off pipeline in a bent structure.

4. The air conditioning system according to claim 3, wherein, The first cut-off pipeline and the second cut-off 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 cut-off device comprises: A cut-off device main body, the cut-off device main body comprises a housing, the first cut-off pipeline, the second cut-off pipeline and the pressure relief pipeline are arranged in the housing, and both ends of the first cut-off pipeline and both ends of the second cut-off pipeline extend out of the housing to be connected to external refrigerant pipelines; and An electrical box, the electrical box comprises 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 cut-off pipeline, the second cut-off pipeline and the pressure relief pipeline to route is formed on the heat insulation part.

7. The air conditioning system according to claim 6, wherein, The heat insulation part comprises 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; The other side opposite to the heat preservation main body is provided with 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 arranged 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 arranged 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 protrude 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 arranged 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 carry out pressure relief protection on the air conditioning system.

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