Refrigerant leakage protection system, air conditioning unit and refrigerant leakage protection method

Abstract

The invention provides a refrigerant leakage protection system and an air conditioning unit, and the system comprises a power supply detection module which is used for detecting an on-off state signal of a power supply of the air conditioning unit; the main control module is used for sending an electric ball valve driving signal to close an electric ball valve arranged at the output end of a refrigerant pipeline of an air conditioner outdoor unit compressor when receiving the off-state signal of the unit power supply detected by the power supply detection module; the power supply module comprises a main circuit module which is connected with an air conditioning unit power supply and supplies power to the main control module, the electric ball valve and the power supply detection module, and a bypass module which is connected with the main circuit module and charges the main circuit module, and the output end of the bypass module supplies power to the electric ball valve when being conducted. The electric energy stored by the capacitor of the bypass of the power supply module can maintain the electric ball valve to be completely closed after the unit is powered off, and the problem of refrigerant leakage after the air conditioning unit is powered off in the operation process is solved. And the capacitance value can be kept when the output end of the capacitor is interrupted during normal power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a refrigerant leakage protection system, an air conditioning unit and a refrigerant leakage protection method. Background Art

[0002] Some types of refrigerants are flammable and explosive. The standard requires that when flammable and explosive refrigerants leak, the refrigerant concentration in the room cannot exceed the range, otherwise there is a risk of explosion. Therefore, air conditioners using flammable and explosive refrigerants need to have refrigerant leakage protection function.

[0003] For example, most houses in North America are in the form of villas, and each house is equipped with a household air-conditioning unit, including an outdoor unit and an indoor unit. The air outlet of the indoor unit is connected to multiple air ducts, and the end of each air duct leads to different rooms. After the air-conditioning unit is turned on, the air outlet of the indoor unit is sent to each room through each duct. The area of ​​the room varies. When the air-conditioning unit leaks refrigerant, the refrigerant will enter the room through the air duct. There is a risk of excessive refrigerant concentration in rooms with smaller areas. In the existing technology, an electronic ball valve is installed in the refrigerant transmission pipeline, and the refrigerant leakage can be effectively prevented by closing the valve. However, the air-conditioning unit can only control the electronic ball valve under normal power supply conditions. There is a situation where the air-conditioning unit is suddenly powered off during operation. At this time, the control system of the unit cannot work due to power failure, and the electronic ball valve is in an open state. If a refrigerant leak occurs later, there is still a risk of explosion. Summary of the invention

[0004] In order to solve the technical problem in the prior art that the refrigerant valve of the air-conditioning unit cannot be closed due to power failure, which easily leads to refrigerant leakage, the present invention proposes a refrigerant leakage protection system, an air-conditioning unit and a refrigerant leakage protection method.

[0005] The technical solution adopted by the present invention is:

[0006] The present invention proposes a refrigerant leakage protection system, comprising:

[0007] A power supply detection module is used to detect the on / off status signal of the power supply of the air-conditioning unit;

[0008] The main control module, when receiving the disconnection state signal of the power supply detection module detecting the power supply of the unit, sends an electric ball valve driving signal to close the electric ball valve arranged at the output end of the refrigerant pipeline of the air conditioner outdoor unit compressor;

[0009] The power supply module includes a main circuit module connected to the air-conditioning unit power supply to the main control module, the electric ball valve, and the power supply detection module, and a bypass module connected to the main circuit module for charging. When the output end of the bypass module is turned on, the electric ball valve is powered.

[0010] Specifically, the bypass module includes: a bypass energy storage capacitor and a relay switch circuit;

[0011] Among them, the charging end of the bypass power supply energy storage capacitor is connected to the output end of the main module and is provided with a diode, and the discharging end is connected to the relay switch circuit; the relay switch circuit is connected to the output end of the main module and receives the disconnection control signal issued by the main control module, and when the main control module receives the disconnection state signal of the unit power supply detected by the power supply detection module, it stops issuing the disconnection control signal to connect the relay switch circuit.

[0012] Specifically, the main module includes: a main energy storage filter capacitor, an input end connected to an external power supply, and an output end connected to the bypass module, the electric ball valve, and the main control module through a power conversion circuit.

[0013] Furthermore, the main control module sends an electric ball valve driving signal to control the electric ball valve driving module to close the electric ball valve.

[0014] Furthermore, the capacitance of the main energy storage filter capacitor is smaller than the capacitance of the energy storage capacitor of the bypass module.

[0015] Furthermore, the main circuit module also includes: a rectifier circuit connected between the main circuit energy storage filter capacitor and an external power supply.

[0016] The protection system also includes: a refrigerant leakage signal detection module, which is used to receive a refrigerant leakage signal sent by the indoor unit of the unit and send it to the main control module.

[0017] Furthermore, when the main control module receives the signal indicating that the power detection module detects that the power supply of the unit is disconnected, it turns off other load functions except the electric ball valve drive signal and the power detection module.

[0018] The present invention also provides an air conditioning unit, comprising the above-mentioned refrigerant leakage protection system.

[0019] The present invention also provides a refrigerant leakage protection method, using the above-mentioned refrigerant leakage protection system, comprising the steps of:

[0020] When receiving the disconnection state signal sent by the power detection module, or receiving the refrigerant leakage signal, or receiving the unit shutdown command, an electric ball valve driving signal is sent to close the electric ball valve.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] The protection system proposed by the present invention can completely close the electric ball valve after the unit is powered off through the electric energy stored in the power module, which solves the problem that the refrigerant leaks after the air-conditioning unit is powered off during operation, and the electronic ball valve cannot prevent the refrigerant leakage because the valve is in an open state. After the electric ball valve is closed, the refrigerant in the compressor cannot continue to leak, and only a small amount of refrigerant remains in the pipeline. Even if it leaks, the indoor refrigerant concentration will not exceed the standard. It can effectively prevent the danger caused by the refrigerant leakage when the unit is powered off. The electric ball valve can be closed when the unit is powered off. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 is a control block diagram of the prior art;

[0025] Figure 2 is a system block diagram in an embodiment of the present invention;

[0026] Figure 3 is a power supply principle diagram of a power module in an embodiment of the present invention;

[0027] Figure 4 It is a flow chart in an embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0030] In the prior art CN221375901U, a control device for an air conditioner is provided. Figure 1As shown, at least one valve body 700 is arranged on the refrigerant pipeline of the air conditioner, the air conditioner includes a first power port 500 and a second power port 600, and the control device includes: a controller 100, a first rectifier circuit 200, a switch power circuit 300 and a backup power circuit 400. The controller 100 is used to control the action of at least one valve body 700 and supply power to at least one valve body 700; the first rectifier circuit 200 is connected to the first power port 500, and is used to rectify the output power of the main power supply 800 into direct current; the switch power circuit 300 is arranged at the output end of the first rectifier circuit 200 and connected to the power end of the controller 100, and is used to convert the direct current output by the first rectifier circuit 200 and supply power to the controller 100; the backup power circuit 400 is arranged at the power end of the switch power circuit 300 and connected to the second power port 600, and is used to convert the output power of the backup power supply 900 and supply power to the switch power circuit 300 when the main power supply 800 is powered off. The first power port 500 is used to connect the main power supply 800, and the second power port 600 is used to connect the backup power supply 900. The main power supply 800 and the backup power supply 900 are arranged outside the air conditioner. The prior art adopts the method of using the backup power supply, but still cannot achieve the preset effect when the main power supply of the house is cut off (house power outage).

[0031] In this regard, Figure 2 , 3 As shown, the present invention proposes a refrigerant leakage protection system, including: a power module, a power detection module and a main control module. The power detection module is used to detect the on / off status signal of the power supply of the air-conditioning unit (which can also be represented as the total power supply in the figure), that is, when it detects that the external power supply is off, it can send a power disconnection signal; the main control module is connected to the power detection module, and the electric ball valve control module of the electric ball valve connected to the refrigerant pipeline output end of the air-conditioning outdoor unit compressor. When the main control module receives the disconnection status signal of the power detection module detecting the unit power supply, it sends an electric ball valve drive signal to the electric ball valve control module, so that the electric ball valve control module gives a control signal to the electric ball valve to control the valve of the electric ball valve to close; the electric module includes a main module and a bypass module. The main module is connected to the power supply of the air-conditioning unit to supply power to the main control module, the electric ball valve and the power detection module. The bypass module is connected to the main module for charging. Both the main module and the bypass module have energy storage capacitors. The bypass module is used to supply power to the electric ball valve. When the main control module receives the power disconnection signal, it stops controlling the bypass module. The output end of the bypass module is automatically turned on to supply power to the electric ball valve, that is, when the external power supply is off, the electric ball valve is supplied with power for a period of time to ensure that the valve of the electric ball valve can be closed.

[0032] The present invention stores electric energy through the capacitor of the power module, so that the electric ball valve can be completely closed after the unit is powered off, which solves the problem that the air-conditioning unit leaks refrigerant after power is cut off during operation, and the electronic ball valve cannot prevent the refrigerant leakage because the valve is in an open state. After the electric ball valve is closed, the refrigerant in the compressor cannot continue to leak, and only a small amount of refrigerant remains in the pipeline. Even if it leaks, the indoor refrigerant concentration will not exceed the standard. It can effectively prevent the danger caused by the refrigerant leakage when the unit is powered off. The electric ball valve can be closed when the unit is powered off.

[0033] In a specific embodiment, the bypass module includes: a bypass energy storage capacitor and a relay switch circuit. The charging end of the bypass energy storage capacitor is connected to the output end of the main module, and during the charging process, the bypass energy storage capacitor is connected to the output end of the main module through a diode to ensure that the capacitor can be charged when the power module is working normally and cannot be discharged directly. The discharge end of the bypass energy storage capacitor is connected to the relay switch circuit. When the power is off, the relay switch circuit is turned on, and the bypass energy storage capacitor releases electrical energy to power the electric ball valve, thereby ensuring that the electric ball valve can work normally within a short time after the power is disconnected.

[0034] The relay switch circuit is connected to the output end of the main module and can receive the disconnection control signal sent by the main control module. Under normal working conditions, the main control module will periodically send control signals to ensure that the relay switch circuit remains disconnected. When the main control module receives the disconnection status signal from the power detection module that the unit power supply is detected, the main control module will stop sending the disconnection control signal, so that the relay switch circuit is automatically connected, the electric energy stored in the bypass power storage capacitor is released, and the electric energy is supplied to the electric ball valve, thereby ensuring that the electric ball valve can be closed in time after the power is disconnected.

[0035] The bypass module is automatically turned on by the rapid discharge of the energy storage capacitor and the power failure of the relay switch circuit. When the external power is disconnected, the electric ball valve can continue to work for a period of time, thus effectively solving the safety hazard of the electric ball valve failing to close normally after power failure, resulting in refrigerant leakage. This design can effectively delay refrigerant leakage, avoid the danger caused by the untimely closing of the electric ball valve, and thus ensure the safe operation of the air conditioning unit.

[0036] In a specific embodiment, the main module includes: a main energy storage filter capacitor and a power conversion circuit; the input end of the main energy storage filter capacitor is connected to an external power supply, and the output end is connected to a bypass module and an electric ball valve, and provides stable electric energy to the main control module through the power conversion circuit. The main energy storage filter capacitor is mainly used to smooth the voltage fluctuation of the input power supply to ensure the stability of the output voltage, thereby providing reliable power support for subsequent circuit modules. At the same time, the main energy storage filter capacitor has an energy storage function. When the external power supply is normally supplied, the main energy storage filter capacitor will store excess electric energy. When the power supply is suddenly disconnected, the main energy storage filter capacitor will quickly release the stored electric energy to maintain the main control module to issue control instructions in the case of power failure. The power conversion circuit can convert the input voltage of the external power supply into an operating voltage suitable for the normal operation of the main control module to ensure the continuous and stable operation of the main control module.

[0037] When the external power supply is in normal power supply state, the main module provides direct power support for the electric ball valve through the main energy storage filter capacitor, and charges the bypass energy storage capacitor at the same time to reserve power for possible power outages. In addition, the main module provides a stable voltage to the main control module through the power conversion circuit, ensuring that the main control module can process the signal of the power detection module in time and effectively control the relay switch circuit.

[0038] By setting the main energy storage filter capacitor, not only can the fluctuation of the external power supply be alleviated, but also emergency power can be provided when the power is disconnected, extending the normal operation time of the system, so that the main control module can still issue control instructions normally after power failure.

[0039] It should be noted that under normal working conditions, when the main control module receives the refrigerant leakage signal sent by the refrigerant leakage signal detection module, or receives the shutdown command made by the user, it directly sends a control signal to drive the electric ball valve to close the valve, and opens the valve again after restarting or there is no refrigerant leakage.

[0040] In a specific embodiment, the main control module sends an electric ball valve driving signal to control the electric ball valve driving module to close the electric ball valve. After the main control module receives the signal that the power detection module detects the disconnection state of the unit power supply, it immediately sends an electric ball valve driving signal to the electric ball valve driving module. After receiving the signal, the electric ball valve driving module is responsible for controlling the electric ball valve, driving its action, and closing the valve of the electric ball valve.

[0041] By adding an electric ball valve drive module, the main control module can send a control signal to the electric ball valve drive module alone when the power is off, and cut off the power supply to other loads, thereby enhancing the system's emergency handling capability in the event of a power outage.

[0042] Specifically, the capacitance of the main energy storage filter capacitor is smaller than the capacitance of the bypass module's energy storage capacitor. The main energy storage filter capacitor has a small capacity and is mainly used for filtering and smoothing power fluctuations to ensure the stable operation of the electric ball valve and the main control module under normal power supply conditions. Because it is in a charging and discharging working state for a long time, its capacity gradually decays, but during normal use, its energy storage and release capabilities are sufficient to support the stable operation of the system. The bypass energy storage capacitor has a larger capacity and will not be in a charging and discharging state all the time, but will start working when the power is disconnected. The bypass capacitor is not often in a charging and discharging state, and can better maintain its energy storage characteristics. Therefore, during the long-term use of the unit, the bypass capacitor can still maintain a good energy storage capacity, ensuring that sufficient electricity can be provided when the power is off, so that the electric ball valve can be completely closed.

[0043] This dual capacitor design ensures that the system can maintain efficient refrigerant leakage protection after long-term use. The main energy storage filter capacitor is responsible for the stability of normal operation, while the bypass energy storage capacitor provides backup power after power failure, which effectively extends the service life of the capacitor and maintains its stable performance, ensuring that the electric ball valve can be closed in time after the power is disconnected to prevent refrigerant leakage.

[0044] In a specific embodiment, the main path module further includes: a rectifier circuit connected between the main path energy storage filter capacitor and the external power supply. The rectifier circuit can convert the AC power of the external power supply into DC power, thereby providing a stable power input for the main path energy storage filter capacitor. The rectifier circuit converts the input AC voltage into a unidirectional current through a diode or a rectifier bridge circuit, ensuring that the main path energy storage filter capacitor can receive a DC power supply for charging.

[0045] By adding a rectifier circuit, the fluctuation and noise in the AC power supply can be effectively filtered out, providing a clean and stable DC voltage for the main energy storage filter capacitor, ensuring the stable operation of the system under power input fluctuations.

[0046] In a specific embodiment, the protection system also includes: a refrigerant leakage signal detection module, which is used to receive a refrigerant leakage signal from the indoor unit of the unit and send the signal to the main control module. The refrigerant leakage signal detection module monitors the flow state of the refrigerant inside the unit in real time through a refrigerant leakage sensor installed in the indoor unit. Once an abnormal signal of refrigerant leakage is detected, the refrigerant leakage signal detection module will immediately transmit the signal to the main control module. After receiving the refrigerant leakage signal, the main control module will take corresponding measures according to the preset control logic, such as sending a drive signal to close the electric ball valve, cutting off the flow of the refrigerant, thereby preventing the refrigerant from continuing to leak into the room and reducing potential safety hazards.

[0047] In a specific embodiment, when the main control module receives a signal indicating that the power supply detection module detects that the power supply of the unit is disconnected, other load functions except the electric ball valve drive signal and the power supply detection module are turned off. That is, in order to ensure efficient use of the system's electrical energy and to ensure that the electric ball valve can be closed in time, the main control module will automatically stop or cut off all other load functions except the electric ball valve drive signal and the power supply detection module.

[0048] In the event of a power outage, the system uses electrical energy primarily to close the electric ball valve to prevent refrigerant leakage, while maintaining the normal operation of the power detection module so that the system can continue to monitor the power status after power is restored.

[0049] The present invention also proposes an air-conditioning unit, including the above-mentioned refrigerant leakage protection system, which is used to provide timely protection measures when power is disconnected or refrigerant leaks. The protection system is composed of a main control module, a power detection module, an electric ball valve drive module, a bypass module, etc., and can maintain power supply through an energy storage capacitor when the power is disconnected, and close the electric ball valve in time to prevent refrigerant from leaking into the indoor environment, thereby improving the safety and reliability of the air-conditioning unit.

[0050] like Figure 4 As shown, the present invention also proposes a refrigerant leakage protection method, using the above-mentioned refrigerant leakage protection system, comprising the steps of:

[0051] When receiving a disconnection status signal from the power detection module (indicating that the power supply of the air conditioner unit fails or is disconnected), or receiving a refrigerant leakage signal (indicating that a refrigerant leakage occurs in the unit), or receiving a unit shutdown command (indicating that the user actively shuts down or the system automatically shuts down);

[0052] The main control module sends out an electric ball valve drive signal to control the electric ball valve drive module to drive the electric ball valve to close, thereby cutting off the connection between the refrigerant pipeline and the indoor unit, preventing the refrigerant from continuing to leak into the indoor environment, and protecting the air conditioning unit from further refrigerant leakage.

[0053] In the event of a power outage, the bypass energy storage capacitor provides power to ensure that the electric ball valve can continue to close and prevent refrigerant from leaking into the room. Through the cooperation of the main energy storage filter capacitor and the bypass capacitor, when the power is disconnected, the bypass energy storage capacitor provides sufficient power support, allowing the electric ball valve to work normally in an emergency until the power is restored or the system is restarted.

[0054] The main control module ensures that the system can first close the electric ball valve when the power is disconnected to prevent refrigerant leakage and avoid safety threats to the environment. At the same time, the system can automatically resume normal operation when the power is restored, ensuring that the air conditioning unit can continue to provide a comfortable indoor environment.

[0055] The refrigerant leakage protection method can quickly respond and close the electric ball valve in the event of power outage, refrigerant leakage or shutdown through an integrated refrigerant leakage protection system, thereby effectively avoiding refrigerant leakage problems and improving the safety and reliability of the air-conditioning unit.

[0056] It should be noted that the terms used above are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0057] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0058] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0059] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0060] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A refrigerant leakage protection system, characterized in that: include: A power supply detection module is used to detect the on / off status signal of the power supply of the air-conditioning unit; The main control module, when receiving the disconnection state signal of the power supply detection module detecting the power supply of the unit, sends an electric ball valve driving signal to close the electric ball valve arranged at the output end of the refrigerant pipeline of the air conditioner outdoor unit compressor; The power supply module includes a main circuit module connected to the air-conditioning unit power supply to supply power to the main control module, the electric ball valve, and the power supply detection module, and a bypass module connected to the main circuit module for charging. When the output end of the bypass module is turned on, the electric ball valve is supplied with power.

2. The refrigerant leakage protection system according to claim 1, characterized in that: The bypass module includes: a bypass energy storage capacitor and a relay switch circuit; Among them, the charging end of the bypass power supply energy storage capacitor is connected to the output end of the main module and is provided with a diode, and the discharging end is connected to the relay switch circuit; the relay switch circuit is connected to the output end of the main module and receives the disconnection control signal issued by the main control module. When the main control module receives the disconnection state signal of the unit power supply detected by the power detection module, it stops issuing the disconnection control signal to connect the relay switch circuit.

3. The refrigerant leakage protection system according to claim 1, characterized in that: The main circuit module comprises: a main circuit energy storage filter capacitor, an input end of which is connected to an external power supply, and an output end of which is connected to the bypass module, the electric ball valve, and the main control module through a power conversion circuit for power supply.

4. The refrigerant leakage protection system according to claim 1, characterized in that: The main control module sends an electric ball valve driving signal to control the electric ball valve driving module to close the electric ball valve.

5. The refrigerant leakage protection system according to claim 3, characterized in that: The capacitance of the main energy storage filter capacitor is smaller than the capacitance of the energy storage capacitor of the bypass module.

6. The refrigerant leakage protection system according to claim 3, characterized in that: The main circuit module also includes: a rectifier circuit connected between the main circuit energy storage filter capacitor and the unit power supply.

7. The refrigerant leakage protection system according to claim 1, characterized in that: Also includes: The refrigerant leakage signal detection module is used to receive the refrigerant leakage signal sent by the indoor unit of the unit and send it to the main control module.

8. The refrigerant leakage protection system according to claim 1, characterized in that: When the main control module receives the disconnection state signal of the power supply detection module detecting the power supply of the unit, it turns off other load functions except the electric ball valve drive signal and the power supply detection module.

9. An air conditioning unit, characterized in that: Comprising a refrigerant leakage protection system as described in any one of claims 1 to 8.

10. A refrigerant leakage protection method, characterized in that: The refrigerant leakage protection system according to any one of claims 1 to 8 comprises the following steps: When receiving the disconnection state signal sent by the power detection module, or receiving the refrigerant leakage signal, or receiving the unit shutdown command, an electric ball valve driving signal is sent to close the electric ball valve.

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