Air conditioning system

Abstract

An air conditioning system, comprising an indoor unit (10), an outdoor unit (20) and a shut-off device (50). The shut-off device (50) comprises a first shut-off line (110) and a second shut-off line (120), which are respectively connected to a first refrigerant line (30) and a second refrigerant line (40) between the indoor unit (10) and the outdoor unit (20) so as to achieve disconnection and connection; and further comprises a pressure relief line (130) provided with a pressure relief valve (131). The shut-off device (50) is configured to receive leakage warning information, disconnect one of the first shut-off line (110) and the second shut-off line (120) while allowing the other to be connected, and drive the pressure relief valve (131) to allow the pressure relief line (130) to be connected so as to direct the high-pressure refrigerant to the compressor (24) for pressure relief protection.

Description

air conditioning system

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese patent application No. 2024109152785, filed on July 9, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of air conditioning technology, and more particularly to an air conditioning system. Background Technology

[0004] Refrigerants such as R32 used in air conditioning systems have low flammability. If a leak occurs during use, an excessive concentration can easily lead to an accident. Usually, a shut-off device is installed in the refrigerant pipeline. The shut-off device is configured to recover refrigerant after a leak in the indoor unit and to cut off the refrigerant in the gas and liquid pipelines, thereby reducing the amount of refrigerant that diffuses into the living space after a leak, and thus reducing potential hazards.

[0005] The shut-off device in related technologies operates automatically and does not require direct user intervention. However, the black-box design can prevent users from recognizing the signals or indications indicating the shut-off device's operation, thus failing to recognize that the air conditioning system has automatically taken safety measures in the event of a refrigerant leak. Furthermore, after the shut-off device activates, users are unsure whether additional safety measures or contacting maintenance personnel for inspection are necessary, leading to unnecessary concerns about the equipment's safety or improper responses when a malfunction occurs, ultimately impacting user confidence and satisfaction with the product. Summary of the Invention

[0006] To address the problem that a black-box design of the shut-off device can prevent users from recognizing the signals or indications indicating its operation, making them unaware that the air conditioning system has automatically taken safety measures, or causing it to react inappropriately when a malfunction occurs, an air conditioning system is designed and provided.

[0007] In some embodiments of this application, an air conditioning system is provided, including:

[0008] Indoor unit;

[0009] Outdoor unit, including compressor;

[0010] An alarm device, including a refrigerant gas concentration sensor, is configured to generate a leak warning message based on the measured refrigerant gas concentration; and

[0011] Cut-off device, comprising:

[0012] The first cut-off pipe, connected to the first refrigerant pipe between the indoor unit and the outdoor unit, is configured to close or open the first refrigerant pipe;

[0013] The second shut-off pipe, connected to the second refrigerant pipe between the indoor unit and the outdoor unit, is configured to either close or open the second refrigerant pipe; and

[0014] A pressure relief pipeline is 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;

[0015] The shut-off device is configured to receive a leak warning message generated based on the measured refrigerant gas concentration, shut off one of the first shut-off pipeline and the second shut-off pipeline and open the other, and drive the pressure relief valve to open the pressure relief pipeline to direct the high-pressure refrigerant to the compressor for pressure relief protection.

[0016] In some embodiments, the alarm device includes a first alarm configured to emit an intermittent warning light signal when the detection value of the refrigerant gas concentration sensor is higher than a first threshold.

[0017] In some embodiments, the alarm device further includes a second alarm configured to emit an intermittent warning sound signal when the detection value of the refrigerant gas concentration sensor is higher than a second threshold; wherein, when the detection value of the refrigerant gas concentration sensor is higher than the second threshold, the alarm device generates the leak warning information; the second threshold is not equal to the first threshold.

[0018] In some embodiments, the second alarm is configured to set a sound output time and / or a sound stop time as the detection value of the refrigerant gas concentration sensor increases, provided that the detection value of the refrigerant gas concentration sensor is higher than a second threshold.

[0019] In some embodiments, the first alarm is configured to stop emitting interval warning light signals when the detection value of the refrigerant gas concentration sensor is lower than a third threshold within a set time period and an active release trigger signal is received; and the second alarm is configured to stop emitting interval warning sound signals when the detection value of the refrigerant gas concentration sensor is lower than a third threshold within a set time period and an active release trigger signal is received; the third threshold is different from both the first threshold and the second threshold.

[0020] In some embodiments, the first alarm is configured to emit a continuous warning light signal when a continuous warning condition is met, and the second alarm is configured to emit a continuous warning sound signal when a continuous warning condition is met.

[0021] In some embodiments, the first alarm is configured to emit a first interval self-test light signal and illuminate when performing a first self-test operation; the first alarm is turned off after a first set light self-test output time from the moment it is turned on, and the first alarm is turned on again after a first set light self-test stop time from the moment it is turned off, continuing until the end of the first self-test cycle.

[0022] In some embodiments, the first alarm is configured to emit a second interval self-test light signal and illuminate when performing a second self-test operation; the first alarm is turned off after a second preset light self-test output time from the moment it is illuminated, and the first alarm is illuminated again after a second preset light self-test stop time from the moment it is turned off, generating the leakage warning information, which continues until the end of the second self-test cycle; the duration of the second self-test cycle is several times that of the first self-test cycle.

[0023] In some embodiments, the first alarm is configured to generate the leakage warning information when performing a first self-test operation and a second self-test operation.

[0024] In some embodiments, the second alarm is configured to emit an intermittent self-test sound signal and sound when performing a first self-test operation and a second self-test operation; the second alarm turns off after a set sound self-test output time from the moment it sounds, and sounds again after a set sound self-test stop time from the moment it turns off, continuing until the end of the first self-test cycle.

[0025] In some embodiments, the air conditioning system further includes a ventilation device configured to receive the leak warning information to circulate indoor and outdoor air for ventilation.

[0026] In some embodiments, the shut-off device further includes: a first filter disposed on the side near the indoor unit; a first switch having one end connected to the first filter and one end of the pressure relief pipe connected between the first switch and the first filter, and the other end of the first switch connected to the outdoor unit; a second filter disposed on the side near the outdoor unit; a second switch having one end connected to the second filter and the other end of the pressure relief pipe connected between the second switch and the second filter, and the other end of the second switch connected to the indoor unit.

[0027] The air conditioning system provided in this application has an alarm device that can detect potential problems in advance and generate leakage warning information. After the leakage warning information is received, the ventilation device can provide outside air, and the shut-off device can realize the functions of shutting off the refrigerant pipeline and depressurization protection. It can respond to abnormal situations more quickly and improve the operational reliability of the air conditioning system.

[0028] Other features and advantages of this application will become clearer after reading the detailed embodiments in conjunction with the accompanying drawings. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 is a structural diagram of a cutting device according to some embodiments;

[0031] Figure 2 is another structural diagram of the cutting device according to some embodiments;

[0032] Figure 3 is an exploded view of a cutting device according to some embodiments;

[0033] Figure 4 is another exploded view of the cutting device according to some embodiments;

[0034] Figure 5 is a structural diagram of an electrical box according to some embodiments;

[0035] Figure 6 is a structural diagram of the main body of the cutting device according to some embodiments after the cover is removed;

[0036] Figure 7 is an exploded view of a shell body according to some embodiments;

[0037] Figure 8 is another exploded view of the shell body according to some embodiments;

[0038] Figure 9 is a structural diagram of a first cut-off pipeline, a second cut-off pipeline, and a pressure relief pipeline according to some embodiments;

[0039] Figure 10 is another structural diagram of the first cut-off pipeline, the second cut-off pipeline, and the pressure relief pipeline according to some embodiments;

[0040] Figure 11 is a structural diagram of a first cut-off conduit according to some embodiments;

[0041] Figure 12 is a structural diagram of a second cut-off conduit according to some embodiments;

[0042] Figure 13 is a structural diagram of an insulation section, a cut-off pipe, and a pressure relief pipe according to some embodiments;

[0043] Figure 14 is another structural diagram of the insulation section, cut-off pipeline, and pressure relief pipeline according to some embodiments;

[0044] Figure 15 is another structural diagram of the insulation section, cut-off pipeline, and pressure relief pipeline according to some embodiments;

[0045] Figure 16 is a structural diagram of the thermal insulation main body according to some embodiments;

[0046] Figure 17 is a schematic diagram of the working principle of an air conditioning system according to some embodiments;

[0047] Figure 18 is a schematic diagram of the working principle of an air conditioning system during cooling according to some embodiments;

[0048] Figure 19 is a schematic diagram of the working principle of an air conditioning system according to some embodiments when it is cooling and refrigerant leakage occurs on the indoor side;

[0049] Figure 20 is a flowchart of the air conditioning system shown in Figure 19 when it is cooling and refrigerant leakage occurs on the indoor side;

[0050] Figure 21 is a schematic diagram of the working principle of the cut-off device for pressure relief protection when the air conditioning system is cooling and the indoor unit is off, according to some embodiments.

[0051] Figure 22 is a flowchart of a pressure relief protection device for the air conditioning system shown in Figure 21 when it is cooling and the indoor unit is off.

[0052] Figure 23 is another schematic diagram illustrating the working principle of the cut-off device for pressure relief protection when the air conditioning system is cooling and the indoor unit is off, according to some embodiments.

[0053] Figure 24 is another flowchart of the pressure relief protection of the cut-off device when the air conditioning system shown in Figure 23 is cooling and the indoor unit is closed;

[0054] Figure 25 is a schematic diagram of the working principle of an air conditioning system in heating mode according to some embodiments;

[0055] Figure 26 is a schematic diagram of the working principle of an air conditioning system according to some embodiments when heating is in progress and refrigerant leakage occurs on the indoor side;

[0056] Figure 27 is a timing diagram of an air conditioning system according to some embodiments;

[0057] Figure 28 is a timing diagram of an air conditioning system according to some embodiments;

[0058] Figure 29 is a schematic diagram of the structure of an alarm device in an air conditioning system according to some embodiments;

[0059] Figure 30 is a schematic block diagram of an air conditioning system according to some embodiments.

[0060] In the diagram: 10. Indoor unit; 11. Indoor heat exchanger; 12. Indoor throttling device; 20. Outdoor unit; 21. Outdoor heat exchanger; 22. Outdoor throttling device; 23. Outdoor fan; 24. Compressor; 25. Four-way valve; 26. Liquid receiver; 30. First refrigerant line; 40. Second refrigerant line; 50. Shut-off device; 100. Main body; 110. First shut-off line; 111. First shut-off line section 1; 112. First shut-off line section 2; 113. First shut-off line section 3; 114. First switch; 115. First filter; 120. Second shut-off line; 121. Second shut-off line section 1; 122. Second shut-off line section 2; 123. Second shut-off line section 3; 124. Second switch; 125. Second filter; 130. Pressure relief line; 131. Pressure relief valve; 140 141. Shell body; 142. Cover; 143. End plate; 1431. First notch; 144. Side plate; 1441. Second notch; 145. Pipe port; 146. Second wiring port; 147. Connecting part; 148. Second connecting part; 150. Insulation part; 200. Electrical box; 210. Box body; 220. Control board; 211. First box body; 212. Second box body; 213. First wiring port; 214. First connecting part; 300. Insulation part; 310. Insulation main body; 311. First groove structure; 312. Second groove structure; 313. Third groove structure; 320. Insulation cover plate; 60. Alarm device; 61. Refrigerant gas concentration sensor; 62. First alarm; 63. Second alarm; 64. Shell; 65. Reset button; 70. Ventilation device. Detailed Implementation

[0061] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0062] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0063] 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 number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0064] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0065] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct disengagement between the first and second features, or disengagement between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0066] The following disclosure provides many different implementations or examples for different structures to implement some embodiments of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or reference letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0067] As shown in Figure 17, some embodiments of this application disclose an air conditioning system including an outdoor unit 20 and at least one indoor unit 10. The air conditioning system performs a refrigeration cycle 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 to cool or heat the indoor space.

[0068] Low-temperature, low-pressure refrigerant enters compressor 24, where it is compressed into a high-temperature, high-pressure refrigerant gas, which is then discharged. 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.

[0069] The expansion valve expands the high-temperature, high-pressure liquid refrigerant that condenses in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor 24. The evaporator achieves a cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0070] Figures 17, 18 and 19 illustrate the working principle of the air conditioning system. The outdoor unit 20 contains an outdoor heat exchanger 21, a compressor 24, an outdoor throttling device 22, an outdoor fan 23, a four-way valve 25, a liquid receiver 26, etc. The indoor unit 10 contains an indoor heat exchanger 11, an indoor throttling valve, and an indoor fan 13, etc.

[0071] Indoor heat exchanger 11 and outdoor heat exchanger 21 are used as condensers or evaporators. When indoor heat exchanger 11 is used as a condenser, the air conditioning system is used as a heater in heating mode, and when indoor heat exchanger 11 is used as an evaporator, the air conditioning system is used as a cooler in cooling mode.

[0072] The air conditioning system in some embodiments of this application further includes a shut-off device 50, which is disposed between the indoor unit 10 and the outdoor unit 20. In some embodiments, it is disposed 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 shut-off device 50 via refrigerant pipelines. The shut-off device 50 can be installed between the outdoor unit 20 and the indoor unit 10 depending on the site conditions; for example, it can be installed outside the room, or it can be installed indoors.

[0073] Referring to FIG21, the shut-off device 50 includes a shut-off pipe and a pressure relief pipe 130. The shut-off pipe is located on the refrigerant line between the indoor unit 10 and the outdoor unit 20, and is configured to shut off or allow the refrigerant line to continue, thereby achieving the refrigerant shut-off function. The pressure relief pipe 130 is configured to provide pressure relief protection.

[0074] In some embodiments, referring to FIG9 and FIG17, a first refrigerant line 30 and a second refrigerant line 40 are provided between the indoor unit 10 and the outdoor unit 20, configured to transport refrigerant. An indoor throttling device 12 and an outdoor throttling device 22 are provided on the first refrigerant line 30.

[0075] The shut-off piping includes a first shut-off piping 110 and a second shut-off piping 120. The first shut-off piping 110 is connected to a first refrigerant line 30 between the indoor unit 10 and the outdoor unit 20, and is configured to shut off or open the first refrigerant line 30. In some embodiments, the first shut-off piping 110 is connected between the indoor heat exchanger 11 and the outdoor heat exchanger 21, or in other words, the first shut-off piping 110 is connected between the indoor throttling device 12 and the outdoor throttling device 22.

[0076] The first disconnection line 110 is switched on / off via a first switch 114. The first switch 114 is configured to control the closure or opening of the first disconnection line 110.

[0077] The second shut-off pipe 120 is connected to the second refrigerant pipe 40 between the indoor unit 10 and the outdoor unit 20, and is configured to shut off or open the second refrigerant pipe 40. In some embodiments, the second shut-off pipe 120 is connected between the indoor unit 10 and the compressor 24.

[0078] The second disconnecting conduit 120 is switched on / off via a second switching element 124. The second switching element 124 is configured to control the closing or opening of the first disconnecting conduit 110.

[0079] One of the first cut-off pipe 110 and the second cut-off pipe 120 is closed while the other is open, so as to transport refrigerant from one of the indoor unit 10 and the outdoor unit 20 to the other.

[0080] The pressure relief line 130 is connected between the first cut-off line 110 and the second cut-off line 120. The pressure relief line 130 is equipped with a pressure relief valve 131. The pressure relief line 130 is configured to lead 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 in order to provide pressure relief protection for the air conditioning system.

[0081] The first end of the pressure relief pipe 130 is connected to the refrigerant pipe between the first switch 114 and the indoor unit 10, that is, the first end of the pressure relief pipe 130 is connected between the first switch 114 and the indoor throttling device 12.

[0082] The second end of the pressure relief pipe 130 is connected to the refrigerant pipe between the second switch 124 and the outdoor unit 20, that is, the second end of the pressure relief pipe 130 is connected between the second switch 124 and the compressor 24.

[0083] In some embodiments, the shut-off device 50 can integrate sensors (such as pressure sensors and temperature sensors) and a controller to achieve automatic monitoring and regulation. For example, when the refrigerant pressure exceeds a set value, the shut-off device 50 automatically cuts off the refrigerant flow and activates the pressure relief function. In addition to pressure relief protection, overheat protection and low-pressure protection functions can also be added to ensure safer and more stable system operation. A segmented shut-off function is added, allowing for zoned control of the first shut-off pipeline 110 and the second shut-off pipeline 120 to adapt to complex system requirements. An additional pressure relief channel is added to address pressure changes in different refrigerant pipelines, improving the system's adaptability. Flexible pressure relief under different operating conditions is achieved by adjusting the opening pressure range of the pressure relief valve. Depressurized refrigerant can be guided to a storage device through a recovery device for reuse, reducing refrigerant loss. A bypass loop is added between the shut-off pipeline and the pressure relief pipeline to achieve dynamic adjustment of the refrigerant flow path, further improving system efficiency. The shut-off pipeline and the pressure relief pipeline can be designed to support bidirectional refrigerant delivery, meeting the needs of multi-mode air conditioning systems (such as switching between cooling and heating modes). By adding a refrigerant balancing pipeline, dynamic balance of refrigerant pressure between the indoor and outdoor units can be achieved.

[0084] In some embodiments, the shut-off device, pressure relief device, and refrigerant piping are designed as a modular structure for easy installation, maintenance, and upgrades. The first switching element 114 and the second switching element 124 can be made of more durable and sensitive solenoid valves or servo valves, improving response speed and service life. Employing more efficient refrigerant and throttling devices (such as electronic expansion valves) in conjunction with the shut-off device improves the overall energy efficiency of the air conditioning system. Through Internet of Things (IoT) technology, the shut-off device, pressure relief piping, and refrigerant piping are integrated into a smart control platform to monitor system operation in real time and perform remote control. Fault diagnosis and early warning functions are introduced; when refrigerant piping pressure is abnormal or the shut-off device malfunctions, the system automatically alarms and takes protective measures.

[0085] If a refrigerant leak occurs on the indoor unit 10 side and is not detected and dealt with in a timely manner, a safety accident may easily occur. As shown in Figure 30, based on the cut-off device 50, the air conditioning system in some embodiments of this application also includes an alarm device 60. The alarm device 60 includes a refrigerant gas concentration sensor 61. The alarm device 60 can be installed in the air-conditioned room or at a location where a refrigerant leak needs to be detected. The alarm device 60 is configured to issue an alarm and generate a leak warning message based on the measured refrigerant gas concentration. The alarm device 60 is communicatively connected to the controller in the air conditioning system. The controller in the air conditioning system can be the controller in the indoor unit 10, the controller in the outdoor unit 20, or a cloud server connected via a gateway. The alarm device 60 can output a leak warning message. Based on the alarm device 60, the air conditioning system provided in some embodiments of this application also includes a ventilation device 70. The ventilation device 70 is configured to receive the leak warning message generated by the alarm device 60 and circulate indoor and outdoor air to achieve ventilation. In some embodiments, the leak warning message can be communicated via optical coupling. Optical coupling communication can achieve electrical isolation and has the characteristics of high speed, large bandwidth, and low power consumption. Leakage warning messages can also be communicated via wired communication, wireless communication, or other similar methods, which will not be listed here.

[0086] In some embodiments, in addition to the refrigerant gas concentration sensor 61, temperature and humidity sensors, smoke sensors, and fire alarm sensors can be integrated to achieve comprehensive environmental monitoring. Through the coordinated operation of multiple sensors, the refrigerant leak point can be located for rapid and targeted measures. Multi-level alarm modes, such as buzzers and flashing lights, can be used to alert occupants. Leakage warning information can be pushed via mobile app, SMS, or email. When a serious leak is detected, the controller directly shuts down the air conditioning system to prevent the danger from escalating. The ventilation rate is automatically adjusted according to the refrigerant concentration to ensure efficient exhaust. When the refrigerant concentration returns to a safe range, the ventilation device automatically stops, saving energy. For multi-room air conditioning systems, multiple independent ventilation devices can be configured for rapid handling of specific leak areas. The ventilation devices can integrate air purification functions (such as filters and activated carbon modules) to purify the air while ventilating, improving indoor air quality. The alarm device is connected to the air conditioning system via an IoT cloud platform, supporting remote monitoring and control. Historical data storage and analysis are used for predictive maintenance and system optimization. Support for low-power communication protocols such as Zigbee and LoRa is added to adapt to different network conditions. When a leak alarm is triggered, the control system can shut down other high-risk equipment in the room (such as gas appliances).

[0087] When the air conditioning system is cooling normally, referring to Figure 18, the indoor unit 10 and outdoor unit 20 are operating normally. At this time, the first switch 114 and the second switch 124 are open, the pressure relief valve 131 is closed, the first shut-off pipe 110 and the second shut-off pipe 120 are in a conductive state, the pressure relief pipe 130 is closed, and the first refrigerant pipe 30 and the second refrigerant pipe 40 are conductive. The refrigerant flowing out of the compressor 24 flows sequentially through the outdoor heat exchanger 21, the outdoor throttling device 22, the first shut-off pipe 110, the indoor throttling device 12, the indoor heat exchanger 11, the second shut-off pipe 120, the liquid receiver 26, and the compressor 24, completing one cycle.

[0088] If a refrigerant leak occurs on the indoor unit 10 side during cooling mode, as shown in Figures 19 and 20, in some embodiments, the controller of the indoor unit 10 receives a leak warning message and uses the communication between the outdoor unit 20 and the indoor unit 10 to transmit the leak warning message to the controller of the outdoor unit 20 and the control terminal of the shut-off device 50. The first switch 114 is closed, controlling the first shut-off pipe 110 to close, blocking the refrigerant from continuing to flow to the indoor unit 10 side. The pressure relief valve 131 is closed, and the pressure relief pipe 130 is closed. The second switch 124 is opened, making the second shut-off pipe 120 conductive. The outdoor unit 20 receives the refrigerant leak signal and simultaneously runs the refrigerant recovery mode. The compressor 24 continues to run, drawing refrigerant from 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 terminal of the shut-off device 50 controls the first shut-off pipe 110 and the second shut-off pipe 120 to close, and the compressor 24 stops working, notifying and waiting for refrigerant leak fault handling. In some embodiments, the control terminal of the shut-off device 50 may be a controller, such as a separate controller. In some embodiments, the first switch 114 and the second switch 124 are both switches that can be controlled independently. In some embodiments, after the compressor 24 stops working, the system sends a notification to the user and / or maintenance personnel for inspection and maintenance.

[0089] It should be noted that, based on the actual situation, the preset compressor running time is T.

[0090] The controller includes a processor. The processor may include a central processing unit (CPU), a microprocessor, or 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.

[0091] Referring to Figure 20, once the air conditioning system is powered on, it begins (S10), and the controller is configured to execute steps S11 to S19.

[0092] S11, indoor unit 10, and outdoor unit 20 are operating normally, and compressor 24 is running at this time.

[0093] S12. At this time, the first switch 114 and the second switch 124 are opened, and the pressure relief valve 131 is closed.

[0094] S13. Determine whether a leakage warning message has been received; if yes, proceed to S14; if no, proceed to S11.

[0095] S14. If it is determined that a leakage warning message has been received, then turn off the first switch 114.

[0096] S15, refrigerant recovery mode, compressor runs 24 hours a day.

[0097] S16. Determine if the compressor running time is greater than or equal to T; if yes, proceed to S17; if no, proceed to S15.

[0098] S17, the first cut-off line 110 and the second cut-off line 120 are closed, and the compressor 24 stops working at the same time.

[0099] S18. Notify and wait for refrigerant leak troubleshooting.

[0100] S19, End.

[0101] In some embodiments, when determining whether a leak warning message has been received in S13, multiple parameter data such as refrigerant pressure, temperature, and flow rate are combined to improve the accuracy of leak detection and avoid false triggering. In S14, while shutting down the first switch, if the leak is severe and cannot be quickly controlled, an emergency system shutdown can be directly triggered to minimize risk. In the refrigerant recovery mode in S15, the operating power and time of compressor 24 are dynamically adjusted based on the leakage amount and the pressure in the refrigerant pipeline to improve recovery efficiency. Real-time monitoring of the refrigerant recovery amount is added, allowing the system to proceed to the next step ahead of schedule upon completion of recovery. A graded response is implemented based on the degree of leakage; minor leaks execute a low-power recovery mode, while severe leaks initiate rapid recovery and trigger additional ventilation devices 70. After completing refrigerant recovery and shutting down the pipeline in S17, a refrigerant recovery completion prompt is added for maintenance personnel to confirm. In S18, while notifying the refrigerant leak fault handling, the controller simultaneously shuts down other equipment in the affected area (such as ventilation systems or doors and windows) to isolate the leaking refrigerant.

[0102] When the air conditioning system is in normal heating mode, referring to Figure 25, the indoor unit 10 and outdoor unit 20 are operating normally. At this time, the first switch 114 and the second switch 124 are open, the pressure relief valve 131 is closed, the first cut-off pipe 110 and the second cut-off pipe 120 are in a conductive state, the pressure relief pipe 130 is closed, and the first refrigerant pipe 30 and the second refrigerant pipe 40 are conductive. The refrigerant flowing out of the compressor 24 flows sequentially through the second cut-off pipe 120, the indoor heat exchanger 11, the indoor throttling device 12, the first cut-off pipe 110, the outdoor throttling device 22, the outdoor heat exchanger 21, the liquid receiver 26, and the compressor 24, completing one cycle.

[0103] If a leak occurs on the indoor unit 10 side during heating mode, referring to Figure 26, in some embodiments, the controller of the indoor unit 10 receives a leak warning message and uses the communication between the outdoor unit 20 and the indoor unit 10 to transmit the leak warning message to the controller of the outdoor unit 20 and the control terminal of the shut-off device 50. The second switch 124 is closed, controlling the second shut-off pipeline 120 to close, 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 114 is opened, making the first shut-off pipeline 110 conductive. The outdoor unit 20 receives the refrigerant leak signal and simultaneously runs the refrigerant recovery mode. The compressor 24 continues to run, drawing refrigerant from 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 terminal of the shut-off device 50 controls the first shut-off pipeline 110 and the second shut-off pipeline 120 to close, and the compressor 24 stops working, notifying and waiting for refrigerant leak fault handling. In some embodiments, the control terminal of the shut-off device 50 may be a controller, such as a separate controller. In some embodiments, the first switch 114 and the second switch 124 are both switches that can be controlled independently. In some embodiments, after the compressor 24 stops working, the system sends a notification to the user and / or maintenance personnel for inspection and maintenance.

[0104] This air conditioning system detects refrigerant leaks and shuts off the gas and liquid refrigerant lines via the shut-off device 50, completely preventing refrigerant from continuing to flow to the indoor unit 10 and causing a refrigerant leak. It also recovers the refrigerant to the outdoor unit 20, thus solving the hidden danger of large-scale leaks of flammable and explosive refrigerants such as R32 and R290.

[0105] When the shut-off device 50 is applied to an air conditioning system, in the event of a refrigerant leak, the indoor unit 10 side and the outdoor unit 20 side can be isolated by a set of shut-off devices 50. When either the indoor unit 10 or the outdoor unit 20 needs to be repaired or have parts replaced, the refrigerant can be delivered 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 shut off, thereby effectively preventing refrigerant leakage on the repair side and reducing the probability of accidents.

[0106] Considering the different operating modes of the air conditioning system, the high-pressure refrigerant pressure may increase with environmental changes, potentially leading to system pipeline rupture and leakage. This air conditioning system uses a cut-off device 50 to simultaneously provide high-pressure relief protection, thus resolving the above potential hazards.

[0107] In some embodiments, multiple refrigerant leakage sensors are added to the refrigerant pipelines of the indoor unit 10 and the outdoor unit 20 to monitor changes in refrigerant concentration, flow rate, and pressure at different locations in real time. Using the data collected by the sensors, algorithms analyze the rate and location of refrigerant leakage, providing more accurate information for subsequent maintenance. Based on the amount of refrigerant leakage and the current system status, the compressor's operating parameters are dynamically adjusted to achieve efficient refrigerant recovery. Equipped with a refrigerant quality sensor, the system sends a notification to the user to confirm the refrigerant recovery status after recovery is complete. A refrigerant separation module is added to classify and store the recovered refrigerant according to its physical properties (such as pressure, temperature, and phase) for later reuse. When the high-pressure refrigerant pressure rises, the system automatically releases excess pressure to the liquid storage tank 26 or a safety container through the pressure relief pipeline 130 to prevent pipeline rupture. During the refrigerant recovery process, explosion-proof electrical components are configured to meet the special requirements of flammable and explosive refrigerants such as R32 and R290. Multiple shutdown trigger conditions have been added (such as power fluctuations, abnormal refrigerant recovery, and excessive leakage) to ensure that the system automatically enters a safe mode in emergency situations.

[0108] Some embodiments of pressure relief protection for the air conditioning system using the cut-off device 50 are shown in Figures 21 and 22. In this mode, the air conditioning system operates in cooling mode, with the indoor unit 10, outdoor unit 20, and compressor 24 running according to normal settings. The first switch 114 and the second switch 124 are normally open, and the pressure relief valve 131 is closed. This means that the first cut-off pipe 110 and the second cut-off pipe 120 are open, while the pressure relief pipe 130 is closed. During air conditioning cooling operation, if the user turns off the indoor unit 10, the indoor throttling device 12 will also close. In this state, high-pressure refrigerant will be liquid-sealed in the refrigerant pipeline from the outdoor unit 20 side to the indoor throttling device 12. With changes in the external environment, such as an increase in temperature, the pressure of the liquid-sealed refrigerant will rise and exceed the pipeline's bearing pressure, 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 131, the pressure relief valve 131 opens to relieve pressure on the high-pressure end. 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.

[0109] Referring to Figure 22, in some embodiments, the difference from the steps performed by the controller in Figure 20 above is that after step S12, the controller does not perform S13 to S18, but is instead configured to perform steps S21 to S25.

[0110] S21, Indoor unit 10 is turned off, indoor throttling device 12 is turned off.

[0111] 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 yes, execute S23; if no, execute S21.

[0112] S23, Pressure relief valve 131 is open.

[0113] 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 yes, proceed to S25; if no, proceed to S23.

[0114] S25, pressure relief valve 131 is closed.

[0115] In some embodiments, multiple pressure sensors are installed in the liquid-sealed pipeline to monitor not only the Pa1 value but also the pressure distribution at other key points in real time, providing more comprehensive pressure data. Temperature sensors are added to predict the peak pressure of the liquid-sealed refrigerant by combining pressure values ​​with ambient temperature trends, enabling preventative pressure relief. An electronically controlled pressure relief valve is introduced to dynamically adjust the pressure relief rate, adjusting the pressure relief rhythm according to refrigerant pressure and system operating status to avoid excessive pressure relief leading to refrigerant loss. When Pa1 is close to Pa2 but has not yet reached it, the compressor power is appropriately reduced to alleviate liquid-sealed pressure. When Pa1 significantly exceeds Pa2, the pressure relief valve 131 is activated, and the operating intensity of the outdoor unit 20 is reduced to assist in pressure reduction. A refrigerant buffer tank is added as an intermediate buffer device to mitigate the impact of high-pressure refrigerant during pressure relief, protecting the compressor 24 and the pipeline system. A backup pressure relief valve is added; when the pressure relief valve 131 malfunctions and cannot operate normally, the backup valve is activated to prevent accidents caused by high liquid-sealed pressure. A pressure relief channel is added, designed with multiple outlet paths to divert high-pressure refrigerant and prevent overload of the pressure relief pipeline 130.

[0116] Some embodiments of pressure relief protection for the air conditioning system using the cut-off device 50 are shown in Figures 23 and 24. In this mode, the air conditioning system operates in cooling mode, with the indoor unit 10, outdoor unit 20, and compressor 24 running according to normal settings. The first switch 114 and the second switch 124 are normally open, and the pressure relief valve 131 is closed. This means the first cut-off pipe 110 and the second cut-off pipe 120 are open, while the pressure relief pipe 130 is closed. During air conditioning operation, if the user turns off the indoor unit 10, the indoor throttling device 12 will also close. In this state, if refrigerant leakage occurs on the indoor unit 10 side, according to the operating mode shown in Figure 19, the system will close the first switch 114. At this time, high-pressure refrigerant will be liquid-sealed in the pipe between the first switch 114 and the indoor throttling device 12. As the external environment changes, such as with temperature increases, the pressure of the liquid-sealed refrigerant will rise and exceed the pipe's bearing pressure, leading to pipe 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 relieve pressure on the high-pressure end. 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.

[0117] Referring to FIG24, in some embodiments, the difference from the steps performed by the controller in FIG22 above is that, between steps S21 and S22, the controller is also configured to perform steps S13 to S14.

[0118] In some of the air conditioning systems provided in this application, the alarm device 60 can detect potential problems in advance and generate leakage warning information. After the leakage warning information is received, the ventilation device 70 can provide outside air. The shut-off device 50 can realize the functions of shutting off the refrigerant pipeline and depressurization protection, which can respond to abnormal situations more quickly and improve the operational reliability of the air conditioning system.

[0119] In some embodiments, a first filter 115 is provided on the first cut-off conduit 110 and a second filter 125 is provided on the second cut-off conduit 120, configured to filter impurities in the system.

[0120] Two first filters 115 are provided on both sides of the first switching member 114. Two second filters 125 are provided on both sides of the second switching member 124.

[0121] Referring to Figure 17, one end of the pressure relief pipe 130 is connected between the first switch 114 and one of the first filters 115, which is located on the side closer to the indoor unit 10. The other end of the pressure relief pipe 130 is connected between the second switch 124 and one of the second filters 125, which is located on the side closer to the outdoor unit 20.

[0122] In some embodiments, the opening pressure (Pa2) and closing pressure (Pa3) of the pressure relief valve 131 are dynamically adjusted by monitoring changes in the ambient temperature in real time to adapt to different environmental conditions (e.g., high-temperature summers and low-temperature winters). When the system pressure approaches a critical value, the early warning control system takes pressure-reducing measures (e.g., reducing compressor power or adjusting refrigerant flow). A secondary pressure relief pipeline is added as a backup pressure relief path to prevent the pressure relief pipeline 130 or pressure relief valve 131 from malfunctioning. The secondary pressure relief pipeline can be designed to connect to a refrigerant recovery tank for refrigerant storage, preventing direct discharge of refrigerant to the compressor 24 and causing overload. A tertiary filter is added to the first filter 115 and the second filter 125 to capture smaller particulate impurities or adsorb moisture and oil in the refrigerant, improving the filtration effect. The materials of each filter can be designed according to system requirements, such as high-temperature and pressure-resistant materials and activated carbon with high adsorption performance. A differential pressure sensor is installed on each filter to monitor the pressure drop of the filter in real time. When the differential pressure exceeds a preset value, the user is prompted to clean or replace the filter element. The maintenance status of the filter can be displayed in real time via the system display screen or mobile application.

[0123] In some embodiments, referring to FIG1, the cutting device 50 includes a main body 100 and an electrical box 200.

[0124] Referring to Figure 4, the main body 100 includes a housing 140, within which a first shut-off pipe 110, a second shut-off pipe 120, and a pressure relief pipe 130 are configured to be installed. Both ends of the first shut-off pipe 110 and both ends of the second shut-off pipe 120 extend from the housing 140 for connection to external refrigerant piping.

[0125] The electrical box 200 includes a box body 210, and a control board 220 is provided inside the box body 210. The control board 220 is configured to control the opening and closing of the first switch 114, the second switch 124, and the pressure relief valve 131.

[0126] Referring to Figure 2, the main body 100 and the electrical box 200 are connected side by side, that is, the housing 140 and the box 210 are connected side by side. In this way, the refrigerant pipeline and the control board 220 are installed in separate spaces, separating the refrigerant pipeline and the control board 220. This prevents condensation from the refrigerant pipeline inside the housing 140 from activating the control board 220 and causing abnormalities such as short circuits in the control board 220, which helps to improve the operational reliability of the air conditioning system.

[0127] Referring to Figure 3, the separate design of the main body 100 of the cutting device 50 and the electrical box 200 also facilitates the assembly of the cutting device 50. During installation, the main body 100 of the cutting device 50 and the electrical box 200 are assembled separately, that is, the first cutting pipe 110, the second cutting pipe 120 and the pressure relief pipe 130 are installed into the housing 140, the control board 220 is installed into the box 210, and then the main body 100 of the cutting device 50 and the electrical box 200 are connected side by side.

[0128] In some embodiments, the first cut-off pipe 110, the second cut-off pipe 120, and the pressure relief pipe 130 are modularly arranged inside the main body 100. Each module is connected via a quick-connect connector for easy replacement and maintenance. Multiple reserved interfaces are designed in the housing 140 for future addition of new piping functions (such as refrigerant flow measurement, pressure regulation, etc.). Heat sinks or heat pipes are added to the exterior of the housing 140 to optimize heat management during refrigerant piping operation. Ventilation holes or a built-in fan are added to the housing 210 of the electrical box 200 to prevent the control board 220 from being affected by heat from electronic components. The sealing of the housing 140 is improved to enhance the dust and water resistance of the cut-off device, achieving a higher IP protection rating (such as IP67) for use in harsher environments. A communication module (such as Wi-Fi, Bluetooth, or an industrial bus interface) is added to the control board 220 to support remote monitoring and operation, allowing users to understand the piping status in real time. The control board 220 monitors the status of the first switch 114, the second switch 124, and the pressure relief valve 131 in real time, provides operational feedback, and outputs status information via LEDs or a digital display. Through pressure and temperature sensors, the control board 220 can dynamically adjust the opening and closing strategies of the first switch 114, the second switch 124, and the pressure relief valve 131 according to actual operating conditions, optimizing refrigerant flow.

[0129] In some embodiments, referring to FIG5, the electrical box 200 has a first connecting portion 214 on its side wall, and the housing 140 has a second connecting portion 148 on its two opposite side walls. The first connecting portion 214 is selectively connected to the second connecting portion 148 on one side of the housing 140. That is, the electrical box 200 can be assembled on both sides to adapt to different installation scenarios on site.

[0130] In some embodiments, referring to Figures 3 and 5, the first connecting part 214 is a hook, and hooks are respectively provided at two corners on the upper side of one side of the electrical box 200. Correspondingly, there are slots on the two opposite side walls of the housing 140. By hooking the hooks into the slots, the electrical box 200 can be assembled onto the main body 100 of the cutting device 50, which is convenient for installation.

[0131] 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 fastened together.

[0132] In some embodiments, the side wall of the electrical box 200 is provided with a first wiring port 213, and the first wiring port 213 and the first connecting part 214 are located on the same side. Correspondingly, the two opposite side walls of the housing 140 are provided with second wiring ports 146. When the electrical box 200 is assembled to the side of the main body 100 of the cutting device 50, the first wiring port 213 and the second wiring port 146 are facing each other, which facilitates the wiring between the electrical box 200 and the main body 100 of the cutting device 50.

[0133] In some embodiments, when the refrigerant flows through the first cut-off pipe 110, the second cut-off pipe 120, and the pressure relief pipe 130, condensation may occur on these refrigerant pipes. To solve this problem, referring to FIG6, this embodiment provides a heat insulation part 300 inside the housing 140. The heat insulation part 300 can be a foam component or the like. The heat insulation part 300 wraps around the first cut-off pipe 110, the second cut-off pipe 120, and the pressure relief pipe 130 to prevent condensation from occurring on these pipes.

[0134] The insulation part 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 insulation part 300 is fixed in the inner cavity of the housing 140. In this way, the insulation part 300 not only serves to insulate the refrigerant pipeline, but also serves to fix the refrigerant pipeline.

[0135] In some embodiments, the insulation part 300 has a groove structure configured for the first cut-off pipe 110, the second cut-off pipe 120, and the pressure relief pipe 130 to run through it. The first cut-off pipe 110, the second cut-off pipe 120, and the pressure relief pipe 130 run through the groove structure, thereby enclosing the first cut-off pipe 110, the second cut-off pipe 120, and the pressure relief pipe 130 by the insulation part 300, and also limiting these pipes.

[0136] In some embodiments, continuing to refer to FIG13, the insulation part 300 includes an insulation main body part 310 and an insulation cover plate part 320. The insulation main body part 310 is provided with a groove structure, and the insulation cover plate part 320 is connected to the insulation main body part 310 to cover the groove structure.

[0137] In some embodiments, the first connecting part 214 and the second connecting part 148 are equipped with rotating interfaces, allowing the electrical box 200 to be installed at multiple angles, including vertical, horizontal, and oblique, adapting to installation scenarios with limited space. The first connecting part 214 is designed as a sliding rail structure, allowing users to adjust the height or lateral position of the electrical box 200 according to site requirements, enhancing installation flexibility. A magnetic module is added, enabling quick docking between the electrical box 200 and the housing 140 via magnets, avoiding complex bayonet designs. A rubber sealing ring is added between the first wiring port 213 and the second wiring port 146 to prevent dust, moisture, or condensation from entering, enhancing system stability. A temperature sensor is integrated within the insulation part 300 to monitor pipeline temperature in real time, automatically adjusting insulation measures via the electrical box 200 when necessary. A sealing gasket is added to the connection between the housing 140 and the electrical box 200 to ensure airtightness and improve overall waterproof and dustproof ratings. An explosion-proof layer is added to the insulation part 300 and the housing 140 to adapt to the operating environment of flammable refrigerants, improving safety.

[0138] Referring to Figure 14, a groove structure is excavated at the corresponding position of the insulation main body 310. The groove structure is a recessed structure with an open side to facilitate the installation of the first cut-off pipe 110, the second cut-off pipe 120, and the pressure relief pipe 130. Then, the insulation cover plate 320 is installed on the insulation main body 310 to seal the open side of the groove structure, that is, to limit the first cut-off pipe 110, the second cut-off pipe 120, and the pressure relief pipe 130 to the corresponding groove structure, thereby achieving all-round wrapping and limiting of these refrigerant pipes.

[0139] The separate design of the insulation main body 310 and the insulation cover plate 320 facilitates the installation of refrigerant pipelines and achieves all-round wrapping and limiting of the refrigerant pipelines.

[0140] In some embodiments, referring to FIG15, groove structures are provided on two opposite outer surfaces of the insulation main body 310. In some embodiments, a first groove structure 311 is provided on one side of the insulation main body 310, and a first cut-off pipe 110 is provided in the first groove structure 311. A second groove structure 312 is provided on the opposite side of the insulation main body 310, and a second cut-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 a pressure relief pipe 130 is provided in the third groove structure 313.

[0141] Referring to Figure 16, by providing the first groove structure 311 and the second groove structure 312 on two opposite sides of the insulation main body 310, the first cut-off pipe 110 and the second cut-off pipe 120 are separated. On the one hand, this effectively prevents heat exchange between the two refrigerants when refrigerant flows in the first cut-off pipe 110 and the second cut-off pipe 120; on the other hand, it facilitates the installation of the first cut-off pipe 110 and the second cut-off pipe 120 from different sides of the insulation main body 310. In addition, there are two insulation cover plates 320, one of which is configured to cover the first groove structure 311, and the other of which is configured to cover the second groove structure 312, so as to reliably wrap and limit the first cut-off pipe 110 and the second cut-off pipe 120.

[0142] The pressure relief pipe 130 runs from the top of the insulation body 310, which facilitates the installation of the pressure relief pipe 130.

[0143] In some embodiments, the housing 140 includes a housing body 141 and a cover 142, with a heat insulation portion 300 disposed inside the housing body 141 and the cover 142 disposed on the top of the housing body 141.

[0144] The first switch 114, the second switch 124, and the pressure relief valve 131 protrude from the top of the insulation body 310, and the two ends of the first cut-off pipe 110 and the two ends of the second cut-off pipe 120 extend from the side of the insulation body 310. Pipe openings 145 are respectively provided on opposite sides of the shell body 141, and the two ends of the first cut-off pipe 110 and the two ends of the second cut-off pipe 120 extend from the corresponding pipe openings 145.

[0145] In some embodiments, the two ends of the first cut-off pipe 110 and the second cut-off pipe 120 pass through the pipe opening 145, and the pipe sections of the first cut-off pipe 110 and the second cut-off pipe 120 passing through the pipe opening 145 are fitted with insulation portions 150, as shown in Figure 9. Most of the pipe sections of the first cut-off pipe 110 and the second cut-off pipe 120 are located within the insulation portion 300, while the portions extending beyond the insulation portion 300 are wrapped with the insulation portion 150. On the one hand, this insulates the extended portions at the ends to prevent condensation; on the other hand, since the insulation portion 150 is located within the pipe opening 145, it prevents the extended portions at the ends of the first cut-off pipe 110 and the second cut-off pipe 120 from being forcibly disconnected from the pipe opening 145, thus providing pipe protection.

[0146] In some embodiments, referring to FIG7, end plates 143 are respectively provided at opposite ends of the shell body 141. The height of the end plates 143 is lower than the height of the shell body, and a first notch 1431 is provided at the top of the end plates 143.

[0147] 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 are directly opposite each other to form a pipe opening 145 for the first cut-off pipe 110 and the second cut-off pipe 120 to run through.

[0148] During installation, the side plate 144 and the cover 142 are not installed first. The insulation part 300, together with the cut-off pipe and the pressure relief pipe 130, is inserted into the shell body 141. At this time, the protruding ends of the first cut-off pipe 110 and the second cut-off pipe 120 fall from top to bottom to the first notch 1431 and abut in place. Then, the side plate 144 is installed, with the first notch 1431 and the second notch 1441 facing each other vertically, thereby limiting the protruding ends of the first cut-off pipe 110 and the second cut-off pipe 120. Finally, the cover 142 is installed.

[0149] In some embodiments, referring to FIG8, a connecting portion 147 is provided on the side plate 144, through which the main body 100 of the cutting device 50 is installed to the desired installation position. The connecting portion 147 can be a hook or other structural form, and this embodiment does not impose specific limitations.

[0150] In some embodiments, the first cut-off pipe 110 and the second cut-off pipe 120 are bent along the insulation body 310. That is, the first cut-off pipe 110 and the second cut-off 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 cut-off pipe 110 is bent along the first groove structure 311, and the second cut-off pipe 120 is bent along the second groove structure 312.

[0151] Referring to Figure 11, the first cut-off conduit 110 has a Z-shaped structure, including a first cut-off conduit section 111, a first cut-off conduit section 112, and a first cut-off conduit section 113 connected sequentially. The first cut-off conduit section 112 connects the height distance between the first cut-off conduit section 111 and the first cut-off conduit section 113. The first cut-off conduit section 111 and the first cut-off conduit section 113 extend horizontally, while the first cut-off conduit section 112 extends vertically. A first switch element 114 is located at the bend intersection of the first cut-off conduit section 112 and the first cut-off conduit section 113, so that the first switch element 114 can be installed facing upwards and exposed from the top of the insulation body 310. A first filter 115 is provided on the first cut-off conduit section 111 and the first cut-off conduit section 113 respectively.

[0152] Referring to Figure 10, the second cut-off conduit 120 also has a Z-shaped structure, including a second cut-off conduit section 121, a second cut-off conduit section 122, and a second cut-off conduit section 123 connected sequentially. The second cut-off conduit section 122 connects the height distance between the second cut-off conduit section 121 and the second cut-off conduit section 123. Referring to Figure 12, the second cut-off conduit section 121 and the second cut-off conduit section 123 extend horizontally, while the second cut-off conduit section 122 extends vertically. The second switch element 124 is located at the bend intersection of the second cut-off conduit section 122 and the second cut-off conduit section 123, so that the second switch element 124 can be installed facing upwards and exposed from the top of the insulation body 310. Second filters 125 are respectively provided on the second cut-off conduit section 121 and the second cut-off conduit section 123.

[0153] The bent pipe routing structure of the first cut-off pipe 110 and the second cut-off pipe 120, on the one hand, allows the first switch 114 and the second switch 124 to be exposed from the top of the insulation body 310; on the other hand, it also helps to improve the stability of the first cut-off pipe 110 and the second cut-off pipe 120 within the insulation part 300, and prevents the first cut-off pipe 110 and the second cut-off pipe 120 from moving left and right or up and down within the insulation part 300.

[0154] 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, and 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 run.

[0155] In some embodiments, a conduit area for the pressure relief conduit 130 is formed above the first cut-off conduit section 111 and the second cut-off conduit section 121. Correspondingly, the insulation body has a third groove structure 313 configured to accommodate the bent conduit section of the pressure relief conduit 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 conduit 130 is accommodated in the third groove structure 313, while another portion runs from above the insulation body 310 to extend to the other side of the insulation body 310 to connect with the second cut-off conduit 120.

[0156] In some embodiments, to adapt to vibration and shock environments, anti-vibration pads or buffer materials are added to the inner wall of the housing 140 and the end plate 143 to reduce damage caused by external forces during operation. Adjustable supports are designed on the sides of the housing 140 to allow for adjustment of the installation angle, adapting to different spatial layouts and installation requirements. Quick-release structures (such as spring clips and quick-locking mechanisms) are added to the side plate 144 and the cover 142 to facilitate on-site inspection and maintenance, reducing installation time. Temperature and pressure sensors are integrated into the first cut-off pipe 110, the second cut-off pipe 120, and the pressure relief pipe 130 to monitor the refrigerant's operating status in real time and feed it back to the control board 220 of the electrical box 200, preventing system failures caused by abnormal pressure or temperature. Physical protection, such as wrapping guide strips or providing guide grooves, is added to the piping areas of the first cut-off pipe 110, the second cut-off pipe 120, and the pressure relief pipe 130 to prevent pipe displacement or contact with other components. An IoT module is integrated into the control board 220 to enable remote monitoring and control. Users can view system status and real-time alarm information through a mobile application, and perform remote adjustments and maintenance. Combined with sensor data, the control board 220 can automatically identify potential faults based on the system's operating status (such as pressure and temperature changes, leak detection, etc.), issue early warnings, and take emergency measures (such as closing valves, activating pressure relief protection, etc.).

[0157] In some embodiments, the installation process of the cutting-off device 50 is as follows:

[0158] Assemble the first cut-off pipe 110, the second cut-off pipe 120, and the pressure relief pipe 130 to form a pipe assembly;

[0159] Install the piping assembly onto the insulation main body 310 from top to bottom;

[0160] Install the insulation cover plate 320 onto the left and right sides of the insulation body 310 to limit the pipeline assembly onto the insulation body 310;

[0161] The insulation part 300, together with the pipeline assembly, is installed 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 top of the first notch 1431 of the end plates 143 on the left and right sides of the shell body 141.

[0162] The side plate 144 is installed on the end plate 143. The second notch 1441 at the bottom of the side plate 144 is directly opposite to the first notch 1431 on the corresponding side, so as to limit the end protruding parts of the first cut-off pipe 110 and the second cut-off pipe 120.

[0163] Install the cover 142 onto the top of the shell body 141;

[0164] Install the electrical box 200 onto the side of the housing body 141.

[0165] In some embodiments of this application, the ventilation device 70 may be a fresh air device, an air purifier, a total heat exchanger, an air circulation fan, or a combination of several of them.

[0166] As shown in Figure 29, in some embodiments of this application, the alarm device 60 includes a housing 64 and a control unit. The control unit includes components such as a processor and a memory. The processor executes programs stored in the memory to perform various functions. A reset button 65 is provided on the housing 64, and the reset button 65 is electrically connected to the control unit. The alarm device 60 can be fixedly installed on a wall.

[0167] In some embodiments of this application, multiple alarm devices 60 may be provided.

[0168] In some embodiments of this application, the alarm device 60 includes a first luminous alarm 62. The first alarm 62 may be a light-emitting diode or a combination of light-emitting diodes; it may also be an electroluminescent lamp. The first alarm 62 is electrically connected to the control unit.

[0169] In some embodiments of this application, when the interval light warning condition is met, the first alarm 62 emits an interval warning light signal. The interval light warning condition is that the detection value of the refrigerant gas concentration sensor 61 is higher than a first threshold (e.g., A). ppm The first threshold corresponds to a relatively low concentration state. An interval warning light signal illuminates the first alarm 62, and after a set light output time elapses from the moment it illuminates, the first alarm 62 is turned off. After a set light stop time elapses from the moment it is turned off, the first alarm 62 is illuminated again.

[0170] In some embodiments, as shown in FIG27, when the interval light warning condition is met, at the start time t 00 The first alarm 62 is activated by emitting an intermittent warning light signal, and the first alarm 62 illuminates. The first alarm 62 automatically... 00 From a certain time, after the set light output time T ON_light All remain lit, and at T ON_light The end time t 01 The first alarm 62 is turned off, and the first alarm 62 automatically turns off. 01 From a given time, after the set light stop time T OFF_light All remain off, and at T OFF_light The end time t 02 The first alarm 62 is activated again. When the interval light warning condition is met, the first alarm 62 activates according to t... 00 To t 02 The work pattern is cyclical and operates within specific time periods.

[0171] In some embodiments of this application, when the interval light warning condition is met, as the detection value of the refrigerant gas concentration sensor 61 increases, the set light output time and / or the set light stop time is shortened.

[0172] In some embodiments of this application, when the detection value of the refrigerant gas concentration sensor 61 is higher than a first threshold, at the start time t 00 The first alarm 62 is activated by emitting an intermittent warning light signal, and the first alarm 62 illuminates. The first alarm 62 automatically... 00 From a certain time, after the set light output time T ON_light All remain lit, and at T ON_light The end time t 01 The first alarm 62 is turned off, and the first alarm 62 automatically turns off. 01 From a given time, after the set light stop time T OFF_light All remain off, and at T OFF_light The end time t 02 This will reactivate the first alarm 62. During this process, T... OFF_light The time is 2 seconds. The optocoupler output remains disconnected, and the cutoff device 50 does not operate. Under the condition of cyclically executing the above operating mode, if the detection value of the refrigerant gas concentration sensor 61 rises and exceeds the second threshold (the second threshold is higher than the first threshold), the operating mode of the first alarm 62 changes to: at the beginning time t 00 The first alarm 62 is activated by emitting an intermittent warning light signal, and the first alarm 62 illuminates. The first alarm 62 automatically... 00 From a certain time, after the set light output time T ON_light All remain lit, and at T ON_light The end time t 01 The first alarm 62 is turned off, and the first alarm 62 automatically turns off. 01 From a given time, after the set light stop time T OFF_light All remain off, and at T OFF_light The end time t 02 This will reactivate the first alarm 62. During this process, T... OFF_light Since 2s is shortened to 1s, T ON_light It remains unchanged.

[0173] In some embodiments of this application, T may also be used. ON_light Since 2s was changed to 1s, T OFF_light It remains unchanged.

[0174] In some embodiments of this application, T may also be simultaneously used. OFF_light and T ON_lightThe time was changed from 2 seconds to 1 second.

[0175] In some embodiments of this application, the set light stop time and / or set light output time can be shortened at a set rate based on the change in the value detected by the refrigerant gas concentration sensor 61. That is, when the concentration value detected by the refrigerant gas concentration sensor 61 changes, the set light stop time can be reduced at a certain rate based on the magnitude of this change, increasing the lighting frequency of the first alarm 62. This allows the first alarm 62 to more clearly and intuitively display the risk level and the changes in risk. When the flashing frequency exceeds the critical flashing frequency, the first alarm 62 can be considered to be issuing a continuous warning signal, reminding the user that the risk level is high.

[0176] In some embodiments of this application, based on real-time data from the refrigerant gas concentration sensor 61, the system can divide multiple alarm levels, such as "low risk," "medium risk," and "high risk" zones, and then adjust the color, brightness, and frequency of the alarm signal. For example, green or blue warning lights are used in low-risk states, yellow warning lights in medium-risk states, and red or flashing red lights in high-risk states. Changes in ambient temperature and humidity may affect the volatilization and diffusion of refrigerant gas concentration; therefore, temperature and humidity sensors can be added, and their data can be combined with refrigerant gas concentration data to improve the accuracy and response speed of the alarm device. The brightness of the warning light is dynamically adjusted according to the light intensity of the indoor environment (e.g., day and night) to ensure that the warning light always has sufficient visibility under different lighting conditions.

[0177] In some embodiments of this application, users can adjust the alarm threshold for refrigerant concentration according to actual needs. Through a control panel or mobile application, users can set different concentration levels and alarm strategies to meet the needs of specific environments or working conditions. In more complex systems, multiple alarm devices can work in conjunction to form a multi-channel alarm system. Different alarm methods (such as alarm frequency, brightness, etc.) can be set for different thresholds in different areas or multiple devices to achieve more precise monitoring. When the refrigerant gas concentration reaches an extremely high dangerous level, the flashing frequency of the first alarm 62 can be further increased, or it can switch to a constant-on state to enhance the sense of urgency. When a certain concentration is exceeded, the system can activate a high-speed flashing mode, enabling staff to quickly identify potential serious risks. When the refrigerant concentration exceeds a critical value, the first alarm 62 can flash continuously for a shorter time, simulating an effect similar to a continuous alarm, prompting users to take immediate emergency measures.

[0178] In some embodiments of this application, the alarm device 60 includes a second alarm 63 capable of emitting sound. The second alarm 63 may be a buzzer or a speaker; it may also be a combination of a buzzer and a speaker.

[0179] In some embodiments of this application, the second alarm 63 emits an intermittent alarm sound signal when an intermittent audible alarm condition is met. The intermittent audible alarm condition is that the detection value of the refrigerant gas concentration sensor 61 is higher than a second threshold (e.g., B). ppm The second threshold corresponds to a relatively high concentration state. The interval warning sound signal causes the second alarm 63 to sound, and after a set sound output time elapses from the moment it sounds, the second alarm 63 is turned off, and after a set sound stop time elapses from the moment it is turned off, the second alarm 63 sounds again.

[0180] In some embodiments of this application, as shown in FIG27, when the interval sound warning condition is met, at the start time t 10 The second alarm 63 emits an intermittent warning sound signal and sounds. The first alarm 62 automatically... 10 From a given moment, after a set sound output time T ON_sound All remained vocal and at T ON_light The end time t 11 The first alarm 62 is turned off, and the first alarm 62 automatically turns off. 11 From a given moment, after the set sound stop time T OFF_sound All remain off, and at T OFF_sound The end time t 12 The first alarm 62 is triggered to sound again. When the interval sound warning condition is met, the first alarm 62, according to t... 10 To t 12 The work pattern is cyclical and operates within specific time periods.

[0181] In some embodiments of this application, the alarm device 60 generates a leakage warning message when the interval sound warning condition is met, and the optocoupler output remains closed. Upon receiving the leakage warning message, the cut-off device 50 and the ventilation device 70 activate.

[0182] In some embodiments of this application, when the interval sound warning condition is met, the sound stop time is shortened as the detection value of the refrigerant gas concentration sensor 61 increases.

[0183] In some embodiments of this application, when the detection value of the refrigerant gas concentration sensor 61 is higher than the second threshold, at the start time t 10 The first alarm 62 emits an intermittent warning sound signal, and the first alarm 62 sounds. The first alarm 62 automatically... 10From a given moment, after a set sound output time T ON_sound All remained vocal and at T ON_sound The end time t 11 The first alarm 62 is turned off, and the first alarm 62 automatically turns off. 11 From a given moment, after the set sound stop time T OFF_sound All remain off, and at T OFF_sound The end time t 12 This causes the first alarm 62 to sound again. During this process, T... OFF_sound The time is 1 second. Under the condition of cyclically executing the above working mode, if the detected value of the refrigerant gas concentration sensor 61 continues to rise, the working mode of the first alarm 62 changes to: based on the change in the detected value of the refrigerant gas concentration sensor 61, the set sound stop time is shortened at a set rate. That is, when the concentration value detected by the refrigerant gas concentration sensor 61 changes, the set sound stop time can be reduced at a certain rate according to the magnitude of this change, increasing the sound frequency of the first alarm 62, thereby allowing the first alarm 62 to more clearly and intuitively display the risk level and the change in risk.

[0184] In some embodiments of this application, when the warning cancellation condition is met, the first alarm 62 stops emitting the interval warning light signal, and the second alarm 63 stops emitting the interval warning sound signal; the warning cancellation condition is that the detection value of the refrigerant gas concentration sensor 61 is lower than the third threshold within a set time period and an active cancellation trigger signal is received; the third threshold is higher than the first threshold but lower than the second threshold.

[0185] When the first alarm 62 and the second alarm 63 are operating in the aforementioned cyclic mode, if the detected value of the refrigerant gas concentration sensor 61 drops below the third threshold within a set time period ts, and an active release trigger signal is received, then the alarm release condition is considered to be met. For example, ts can be set to several seconds, and the active release trigger signal can be set to continuously pressing the reset button 65 located on the housing of the alarm device 60 for more than 3 seconds.

[0186] In some embodiments of this application, when the continuous warning condition is met, the first alarm 62 emits a continuous warning light signal and the second alarm 63 emits a continuous warning sound signal.

[0187] In some embodiments of this application, the continuous warning condition is: within a set determination period after the interval sound warning condition is met, the warning cancellation condition is not met. For example, in t... 10When the time-interval audible warning condition is met, within the following M seconds, the first alarm 62 emits an interval warning light signal, the second alarm 63 emits an interval warning audible signal, and the alarm device 60 generates a leak warning message. Upon receiving the leak warning message, the shut-off device 50 and the ventilation device 70 activate. If the shut-off device 50 and the ventilation device 70 operate normally, the refrigerant gas temperature sensor reading will decrease and remain at a safe level, such as the third threshold C. ppm Satisfying A ppm <C ppm ppm The alarm device 60 simultaneously determines whether an active release trigger signal has been received. This active release trigger signal is generated manually, for example, by a maintenance personnel manually and continuously pressing the reset button 65 on the alarm device 60 housing for more than 3 seconds, or by a user manually and continuously pressing the reset button 65 on the alarm device 60 housing for more than 3 seconds under remote guidance. This indicates that someone has noticed the safety hazard. M seconds is the working time set based on the operation of the shut-off device 50 and the ventilation device 70. If the alarm release condition is not met within the set judgment period (e.g., within N seconds) after the shut-off device 50 and the ventilation device 70 have been operating for M seconds, it indicates that the refrigerant gas temperature sensor's detection value has not decreased at the ideal level, and there is a risk of malfunction in the shut-off device 50 and the ventilation device 70, or that no one has noticed the safety hazard of refrigerant leakage. In this case, the first alarm 62 changes to emitting a continuous warning light signal, and the second alarm 63 emits a continuous warning sound signal, increasing the warning level.

[0188] In some embodiments of this application, the continuous warning condition is as follows: within a set judgment period after the interval sound warning condition is met, the warning cancellation condition is met, but after the warning cancellation condition is met, the interval sound warning condition is met again. When the active cancellation trigger signal is received, the refrigerant gas temperature sensor detection value is still greater than A. ppm If the interval light warning condition is met, the first alarm 62 will emit an interval warning light signal, the second alarm 63 will shut down, and the alarm device 60 will stop generating leakage warning information. The shut-off ventilation measures of the shut-off device 50 and the ventilation device 70 will also cease execution. If the interval sound warning condition is met again within the set judgment period after the warning cancellation condition is met (as shown in Figure 28), it indicates that the leakage fault has not been resolved and the shut-off device 50 and the ventilation device 70 cannot resolve the leakage fault. At this time, the first alarm 62 and the second alarm 63 will emit continuous warning light signals and continuous warning sound signals, respectively, raising the warning level. Further manual intervention is required based on this.

[0189] ​In some embodiments of this application, the alarm frequency can be set not only based on the concentration value but also dynamically adjusted according to the rate of concentration change. For example, when the concentration increases rapidly, the alarm frequency can be increased, or even switched to a higher-frequency continuous alarm mode to indicate a more urgent danger. The system can learn from long-term monitoring data and combine it with changes in environmental conditions to predict possible refrigerant leakage trends and issue early warning signals. For example, through historical data analysis, it can predict which time periods or environmental conditions are more likely to cause leaks, thereby preparing and activating alarms in advance.

[0190] In some embodiments of this application, in addition to sound and light signals, vibration alarms can be introduced to address certain environments (such as noisy or dimly lit places). Vibration alarms can transmit alarm information through wearable devices, the alarm device itself, or physical interfaces such as seats or handles. Vibration feedback of different frequencies and intensities can be designed according to the refrigerant gas concentration. For example, the vibration interval is longer at low concentrations, and the higher the concentration, the stronger the vibration frequency and intensity. The second alarm 63 can be equipped with a volume adjustment function to adapt to the needs of different environments. For example, in a noisy environment, the alarm can automatically increase the volume or change the tone to make the alarm more noticeable. The light signal of the first alarm 62 is not limited to a flashing mode; it can also use gradually changing light colors (such as from yellow to red). As the concentration increases, the intensity and color of the light can change to visually indicate the level of risk.

[0191] In some embodiments of this application, the air conditioning system may perform a first self-test operation. During the first self-test operation, the first alarm 62 emits a first interval self-test light signal; the first interval self-test light signal causes the first alarm 62 to light up, and after a first set light self-test output time elapses from the moment it lights up, the first alarm 62 is turned off, and after a first set light self-test stop time elapses from the moment it is turned off, the first alarm 62 is turned on again; a leakage warning message is generated, which continues until the end of the first self-test cycle.

[0192] In some embodiments of this application, the air conditioning system may perform a second self-test operation. During the second self-test operation, the first alarm 62 emits a second interval self-test light signal. The second interval self-test light signal illuminates the first alarm 62, and after a second preset light self-test output time elapses from the moment it illuminates, the first alarm 62 is turned off. After a second preset light self-test stop time elapses from the moment it is turned off, the first alarm 62 is illuminated again, generating a leakage warning message, which continues until the end of the second self-test cycle.

[0193] In some embodiments of this application, when the air conditioning system performs the first self-test operation and the second self-test operation, the second alarm 63 emits an intermittent self-test sound signal. The intermittent self-test sound signal causes the second alarm 63 to sound, and after a set sound self-test output time from the moment it sounds, the second alarm 63 shuts off. After a set sound self-test stop time from the moment it shuts off, the second alarm 63 sounds again, continuing until the end of the first self-test cycle. In some embodiments of this application, the first self-test operation and the second self-test operation are independent operations. The content of the self-test varies according to user needs and can be manually set. When the user sets the first self-test operation, it runs according to the first self-test operation; when the user sets the second self-test operation, it runs according to the second self-test operation.

[0194] In some embodiments of this application, the first self-test operation can be initiated by a reset button 65 provided on the alarm device 60. For example, when the reset button 65 generates a signal for more than 3 seconds, the first self-test operation is performed.

[0195] In some embodiments of this application, the second self-test operation can be initiated by double-clicking the reset button 65 set on the alarm device 60.

[0196] In some embodiments of this application, the first self-test operation is disabled when the interval light warning condition, the interval sound warning condition, or the continuous warning condition is met. That is, it is assumed that the priority of the interval light warning condition, the interval sound warning condition, or the continuous warning condition is higher than the priority of the first self-test operation.

[0197] In some embodiments of this application, the second self-test operation is disabled when the interval light warning condition, the interval sound warning condition, or the continuous warning condition is met. That is, it is assumed that the priority of the interval light warning condition, the interval sound warning condition, or the continuous warning condition is higher than the priority of the second self-test operation.

[0198] When the first alarm 62 includes multiple LEDs, the first interval self-test light signal and the interval warning light signal can be implemented by different LEDs, such as LEDs of different colors. The first self-test cycle can be set to 6 seconds.

[0199] When the first alarm 62 includes multiple LEDs, the second interval self-test light signal and the interval warning light signal can be implemented by different LEDs, such as LEDs of different colors. The second self-test cycle is several times longer than the first self-test cycle, and the second self-test cycle can be set to 80 seconds.

[0200] The first self-test operation can be used to initially check the linkage of the air conditioning system, whether the communication between the alarm device 60, indoor unit, outdoor unit, shut-off device 50, and ventilation device 70 is normal, and whether the first alarm 62 and the second alarm 63 are working properly. The second self-test operation can be used to check whether the refrigerant has been properly recovered through the shut-off device 50.

[0201] When powered on, the alarm device 60 can be configured to perform a self-test once per self-test cycle. If there is no fault and no alarm, the first alarm 62 displays a normal self-test light signal. When the first alarm 62 includes multiple LEDs, the normal self-test light signal can be achieved by LEDs of different colors. If a fault exists, the first alarm 62 outputs a fault self-test light signal. The form of the fault self-test light signal is not limited here.

[0202] In some embodiments of this application, the air conditioning system is further configured to, during the normal startup phase, display a startup light signal on the first alarm 62 and establish a communication connection between the alarm device 60, the indoor unit, the outdoor unit, the shut-off device 50, and the ventilation device 70. If a fault occurs during the startup phase, while maintaining the communication connection between the alarm device 60, the indoor unit, the outdoor unit, the shut-off device 50, and the ventilation device 70, an intervention signal is generated to drive the shut-off device 50 to operate, preventing refrigerant leakage during the startup phase. Simultaneously, the first alarm 62 and the second alarm 63 continue to display fault indication signals until the fault is resolved or the device is repaired or replaced.

[0203] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. Air conditioning system, including: Indoor unit; Outdoor unit, including compressor; An alarm device, including a refrigerant gas concentration sensor, is configured to generate the leak warning information based on the measured refrigerant gas concentration. and Cut-off device, comprising: The first cut-off pipe, connected to the first refrigerant pipe between the indoor unit and the outdoor unit, is configured to close or open the first refrigerant pipe; The second shut-off pipe, connected to the second refrigerant pipe between the indoor unit and the outdoor unit, is configured to either close or open the second refrigerant pipe; and A pressure relief pipeline is 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 shut-off device is configured to receive the leakage warning information, close one of the first shut-off pipeline and the second shut-off pipeline and open the other, and drive the pressure relief valve to open the pressure relief pipeline to lead the high-pressure refrigerant to the compressor for pressure relief protection.

2. The air conditioning system according to claim 1, wherein: The alarm device includes a first alarm, which is configured to emit an intermittent warning light signal when the detection value of the refrigerant gas concentration sensor is higher than a first threshold.

3. The air conditioning system according to claim 2, wherein: The alarm device further includes a second alarm, which is configured to emit an intermittent warning sound signal when the detection value of the refrigerant gas concentration sensor is higher than a second threshold; wherein, when the detection value of the refrigerant gas concentration sensor is higher than the second threshold, the alarm device generates the leakage warning information; the second threshold is not equal to the first threshold.

4. The air conditioning system according to claim 3, wherein: The second alarm is further configured to, when the detection value of the refrigerant gas concentration sensor is higher than a second threshold, set the sound output time and / or set the sound stop time to shorten as the detection value of the refrigerant gas concentration sensor increases.

5. The air conditioning system according to claim 3, wherein: The first alarm is configured to stop emitting interval warning light signals when the detection value of the refrigerant gas concentration sensor is lower than a third threshold within a set time period and an active release trigger signal is received; the second alarm is configured to stop emitting interval warning sound signals when the detection value of the refrigerant gas concentration sensor is lower than a third threshold within a set time period and an active release trigger signal is received; the third threshold is different from both the first threshold and the second threshold.

6. The air conditioning system according to claim 5, wherein: The first alarm is configured to emit a continuous warning light signal when the continuous warning condition is met, and the second alarm is configured to emit a continuous warning sound signal when the continuous warning condition is met.

7. The air conditioning system according to claim 6, wherein: The first alarm is configured to emit a first interval self-test light signal and light up when performing the first self-test operation; the first alarm is turned off after a first set light self-test output time from the time it is turned on, and the first alarm is turned on again after a first set light self-test stop time from the time it is turned off, and continues until the end of the first self-test cycle.

8. The air conditioning system according to claim 7, wherein: The first alarm is configured to emit a second interval self-test light signal and light up when performing the second self-test operation; the first alarm is turned off after a second set light self-test output time from the moment it is turned on, and the first alarm is turned on again after a second set light self-test stop time from the moment it is turned off, generating the leakage warning information, which continues until the end of the second self-test cycle; The duration of the second self-test cycle is several times that of the first self-test cycle.

9. The air conditioning system according to claim 8, characterized in that: The first alarm is configured to generate the leakage warning information when performing a first self-test operation and a second self-test operation.

10. The air conditioning system according to claim 8, wherein: The second alarm is configured to emit an intermittent self-test sound signal and sound when performing the first self-test operation and the second self-test operation; the second alarm is turned off after a set sound self-test output time from the time of self-test sounding, and the second alarm sounds again after a set sound self-test stop time from the time of self-test turn-off, continuing until the end of the first self-test cycle.

11. The air conditioning system according to claim 1, further comprising: A ventilation device is configured to receive the leak warning information and circulate indoor and outdoor air for ventilation.

12. The air conditioning system according to claim 1, wherein, The severing device further includes: The first filter is located on the side closest to the indoor unit; The first switch has one end connected to the first filter and one end of the pressure relief pipeline is connected between the first switch and the first filter, and the other end is connected to the outdoor unit. The second filter is located on the side closer to the outdoor unit; The second switch has one end connected to the second filter and the other end of the pressure relief pipe connected between the second switch and the second filter, and the other end of the switch is connected to the indoor unit.

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