Air conditioning unit and control method thereof

Abstract

The invention provides an air conditioning unit and a control method thereof. In the air conditioning unit, a pipeline between a condenser and an evaporator is marked as a first pipeline, a pipeline between a gas-liquid separator and the evaporator is marked as a second pipeline, a first electric control valve is arranged on the first pipeline, and a second electric control valve is arranged on the second pipeline; the air conditioning unit further comprises an exhaust pipeline located on the outdoor side, an exhaust valve is arranged on the exhaust pipeline, the inlet end of the exhaust pipeline communicates with the second pipeline, and the communicating position is located on the upstream side of the second electric control valve. When the first electric control valve on the liquid side and / or the second electric control valve on the gas side breaks down, the exhaust valve can be in an open state, so that refrigerants are discharged out of the outdoor side, the refrigerants are prevented from further gathering and leaking towards the indoor side, the unit and personal safety are protected, and the working efficiency is improved. Powerful technical support and guarantee are provided for development of the technical field of air conditioners, and potential safety hazards are better eliminated.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air conditioning, and in particular to an air conditioning unit and a control method thereof. Background Art

[0002] With the continuous development of air-conditioning technology, air-conditioning units with flammable refrigerants are gradually being used in the market. Such air-conditioning units can effectively realize cooling or heating functions during normal operation, meeting users' needs for indoor environment temperature regulation.

[0003] During the operation of air-conditioning units, refrigerant leakage is a safety issue that requires special attention. When flammable refrigerant leaks, it is very easy to cause serious safety accidents such as fires, posing a huge threat to the unit itself and the personal safety of customers. At present, the industry generally uses electric control valves such as electric ball valves to deal with this problem. That is, when refrigerant leakage is detected, the electric control valve quickly acts to disconnect the indoor and outdoor units of the air-conditioning unit. At the same time, the compressor starts the refrigerant recovery program to recover the refrigerant in the indoor unit to the outdoor unit or other safe storage locations as much as possible, thereby effectively reducing the leakage of indoor refrigerant and reducing safety risks.

[0004] However, as an electromechanical device, the electric ball valve has a limited service life. In some specific usage scenarios, such as office spaces and commercial buildings, the power supply of the air-conditioning unit is usually controlled according to the use time of the personnel. During off-duty hours or when no one is indoors, the air-conditioning unit is often powered off to save electricity, and the power supply is restored when the person goes to work or returns the next day. This frequent power-off and power-on process will have a great impact on the electric control valve. Each power-off and power-on will cause the electric control valve to undergo a start and stop action, which will inevitably consume the life of the electric control valve. Over time, the reliability of the electric control valve will gradually decrease, and it may not be able to perform the cut-off and refrigerant recovery operations in a timely and effective manner when the refrigerant leaks, which will lead to increased safety hazards. Once the electric control valve fails at a critical moment, a large amount of flammable refrigerant may leak into the indoor environment. When encountering open flames or other ignition sources, it is very easy to cause catastrophic accidents such as fire and explosion, which will not only cause serious damage to the air-conditioning unit, but also endanger the lives and property of surrounding personnel, posing a major safety hazard. Summary of the invention

[0005] In view of this, in order to solve the technical problem in the prior art that an electric control valve of an air-conditioning unit fails and thus poses a potential safety hazard, the present disclosure provides an air-conditioning unit and a control method thereof.

[0006] According to a first aspect of an embodiment of the present disclosure, an air conditioning unit is provided, in which a pipeline between a condenser and an evaporator is referred to as a first pipeline, a pipeline between a gas-liquid separator and the evaporator is referred to as a second pipeline, a first electric control valve is provided on the first pipeline, and a second electric control valve is provided on the second pipeline;

[0007] Wherein, the air conditioning unit also includes an exhaust pipeline, the exhaust pipeline is located on the outdoor side, and an exhaust valve is arranged on the exhaust pipeline. The inlet end of the exhaust pipeline is connected with the second pipeline, and the connection position is located on the upstream side of the second electric control valve.

[0008] In an alternative embodiment,

[0009] The air conditioning unit comprises a control device, and the first electric control valve, the second electric control valve and the exhaust valve are electrically connected to the control device respectively;

[0010] The control device is configured to, when there is a refrigerant leak in the air-conditioning unit, control the first electric control valve to be in a closed state and the second electric control valve to be in an open state, and then control the exhaust valve to be in an open state if it is determined that the first electric control valve is faulty.

[0011] In an alternative embodiment,

[0012] The air conditioning unit comprises a high-voltage detection device, the high-voltage detection device is used to detect the high-pressure side pressure in the air conditioning unit, and the control device is electrically connected to the high-voltage detection device;

[0013] The control device is configured to, when there is a refrigerant leakage in the air-conditioning unit, control the first electric control valve to be in a closed state and the second electric control valve to be in an open state, and then determine that there is a fault in the first electric control valve if it is determined that the high-pressure side pressure detected by the high-pressure detection device does not reach a first pressure threshold within a first time period.

[0014] In an alternative embodiment,

[0015] The air conditioning unit comprises an internal fan and an air guide plate, wherein the internal fan and the air guide plate are electrically connected to the control device respectively;

[0016] The control device is configured to, when a refrigerant leakage is detected in the air-conditioning unit and if it is determined that the first electric control valve is faulty, increase the rotation speed of the internal fan and control the air guide plate to be in an open state.

[0017] In an alternative embodiment,

[0018] The air conditioning unit comprises a control device, and the first electric control valve, the second electric control valve and the exhaust valve are electrically connected to the control device respectively;

[0019] Wherein, the control device is configured to, when there is a refrigerant leakage in the air-conditioning unit, control the first electric control valve and the second electric control valve to be in a closed state, and if it is determined that the second electric control valve is faulty, control the exhaust valve to be in an open state.

[0020] In an alternative embodiment,

[0021] The air conditioning unit comprises a low-pressure detection device, the low-pressure detection device is used to detect the low-pressure side pressure in the air conditioning unit, and the control device is electrically connected to the low-pressure detection device;

[0022] In which, the control device is configured to, when there is a refrigerant leakage in the air-conditioning unit, control the first electric control valve and the second electric control valve to be in a closed state. If it is determined that the low-pressure side pressure detected by the low-pressure detection device does not reach the second pressure threshold within a second time period, it is determined that there is a fault in the second electric control valve.

[0023] In an alternative embodiment,

[0024] The air conditioning unit comprises an internal fan and an air guide plate, wherein the internal fan and the air guide plate are electrically connected to the control device respectively;

[0025] The control device is configured to, when a refrigerant leakage is detected in the air-conditioning unit and if it is determined that the second electric control valve is faulty, increase the rotation speed of the internal fan and control the air guide plate to be in an open state.

[0026] In an alternative embodiment,

[0027] The first electric control valve and / or the second electric control valve comprises an electric ball valve.

[0028] According to a second aspect of an embodiment of the present disclosure, a control method is provided, and the control method is applied to the air-conditioning unit as described in any one of the first aspects, in which the pipeline between the condenser and the evaporator is recorded as the first pipeline, and the pipeline between the gas-liquid separator and the evaporator is recorded as the second pipeline, a first electric control valve is provided on the first pipeline, and a second electric control valve is provided on the second pipeline, the air-conditioning unit further includes an exhaust pipeline, the exhaust pipeline is located on the outdoor side of the air-conditioning unit, and an exhaust valve is provided on the exhaust pipeline, and an inlet end of the exhaust pipeline is connected to the second pipeline, and the connection position is located on the upstream side of the second electric control valve;

[0029] The control method comprises:

[0030] When refrigerant leakage is detected in the air-conditioning unit, the first electric control valve is controlled to be in a closed state and the second electric control valve is controlled to be in an open state. If it is determined that the first electric control valve is faulty, the exhaust valve is controlled to be in an open state.

[0031] In an alternative embodiment,

[0032] Determining whether the first electric control valve is faulty includes:

[0033] In the event that there is a refrigerant leak in the air-conditioning unit, after controlling the first electric control valve to be in a closed state and the second electric control valve to be in an open state, if it is determined that the high-pressure side pressure of the air-conditioning unit does not reach the first pressure threshold within a first time period, it is determined that there is a fault in the first electric control valve.

[0034] In an alternative embodiment,

[0035] The air conditioning unit includes an internal fan and an air guide plate, and the control method includes:

[0036] When a refrigerant leak is detected in the air-conditioning unit, if it is determined that the first electric control valve is faulty, the rotation speed of the internal fan is increased and the air guide plate is opened.

[0037] In an alternative embodiment,

[0038] The control method comprises:

[0039] In the case of refrigerant leakage in the air-conditioning unit, after controlling the first electric control valve to be in a closed state and the second electric control valve to be in an open state, if it is determined that the first electric control valve has no fault, controlling the second electric control valve to be in a closed state;

[0040] In the event of a refrigerant leak in the air-conditioning unit, after the first electric control valve and the second electric control valve are both controlled to be in a closed state, if it is determined that the second electric control valve is faulty, the exhaust valve is controlled to be in an open state.

[0041] In an alternative embodiment,

[0042] The determining that the second electric control valve has a fault includes:

[0043] In the event of refrigerant leakage in the air-conditioning unit, after controlling the first electric control valve and the second electric control valve to be in a closed state, if it is determined that the low-pressure side pressure of the air-conditioning unit does not reach the second pressure threshold within a second time period, it is determined that the second electric control valve is faulty.

[0044] In an alternative embodiment,

[0045] The air conditioning unit includes an internal fan and an air guide plate, and the control method includes:

[0046] When a refrigerant leak is detected in the air-conditioning unit, if it is determined that the second electric control valve is faulty, the rotation speed of the internal fan is increased and the air guide plate is opened.

[0047] In an alternative embodiment,

[0048] The step of controlling the exhaust valve to be in an open state comprises:

[0049] The exhaust valve is opened from a closed state to a set opening, and then gradually opened from the set opening to a maximum opening.

[0050] The technical solution provided by the embodiment of the present disclosure may include the following beneficial effects: in the air-conditioning unit of the present disclosure, a first electric control valve is arranged on the pipeline (referred to as the first pipeline) between the condenser and the evaporator, and the first electric control valve serves as the liquid side control valve of the refrigerant in the air-conditioning unit; a second electric control valve is arranged on the pipeline (referred to as the second pipeline) between the gas-liquid separator and the evaporator, and the second electric control valve serves as the gas side control valve of the refrigerant in the air-conditioning unit; and an exhaust pipeline is added on the outdoor side of the air-conditioning unit, the inlet end of the exhaust pipeline is connected to the second pipeline, and the connection position is located on the upstream side of the second electric control valve, and an exhaust valve is arranged on the exhaust pipeline. Based on this, when the first electric control valve on the liquid side and / or the second electric control valve on the gas side fails, the exhaust valve can be opened, thereby discharging the refrigerant to the outdoor side, preventing the refrigerant from further gathering and leaking to the indoor side, and protecting the unit and personal safety. Especially for air-conditioning units with flammable refrigerants, the present disclosure can significantly reduce the risk of safety accidents such as fire and explosion caused by refrigerant leakage, effectively protect the integrity of the air-conditioning unit and the safety of life and property of indoor personnel, and can greatly improve the safety, reliability and practicality of the air-conditioning unit, providing strong technical support and guarantee for the development of the field of air-conditioning technology, and better eliminating safety hazards.

[0051] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0053] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0054] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0055] Figure 1 is a system schematic diagram of an air conditioning unit according to an exemplary embodiment.

[0056] Figure 2 The figure is a schematic diagram of a control flow of an air-conditioning unit according to an exemplary embodiment.

[0057] Reference numerals:

[0058] 11. Gas-liquid separator; 12. Condenser; 13. Evaporator; 14. Compressor; 15. Four-way valve; 16. Internal fan; 17. Throttling element;

[0059] 21. First electric control valve; 22. Second electric control valve; 23. Exhaust valve;

[0060] 31. First pipeline; 32. Second pipeline; 33. Exhaust pipeline. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0062] The disclosure below provides many different embodiments or examples to implement different schemes of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0063] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0064] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application, and thus the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0065] The following will describe the implementation methods of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, not for limiting the scope of protection of the present application.

[0066] In order to solve the technical problem in the prior art that an electric control valve of an air-conditioning unit fails and thus poses a potential safety hazard, the present disclosure provides an air-conditioning unit and a control method thereof.

[0067] Among them, in the air-conditioning unit disclosed in the present invention, a first electric control valve is arranged on the pipeline between the condenser and the evaporator (recorded as the first pipeline), and the first electric control valve serves as the liquid side control valve of the refrigerant in the air-conditioning unit; a second electric control valve is arranged on the pipeline between the gas-liquid separator and the evaporator (recorded as the second pipeline), and the second electric control valve serves as the gas side control valve of the refrigerant in the air-conditioning unit; and an exhaust pipeline is newly added on the outdoor side of the air-conditioning unit, the inlet end of the exhaust pipeline is connected with the second pipeline, and the connection position is located on the upstream side of the second electric control valve, and an exhaust valve is arranged on the exhaust pipeline. Based on this, when the first electric control valve on the liquid side and / or the second electric control valve on the gas side fails, the exhaust valve can be opened, thereby discharging the refrigerant to the outdoor side, avoiding further accumulation and leakage of the refrigerant to the indoor side, and protecting the unit and personal safety. Especially for air-conditioning units with flammable refrigerants, the present disclosure can significantly reduce the risk of safety accidents such as fire and explosion caused by refrigerant leakage, effectively protect the integrity of the air-conditioning unit and the safety of life and property of indoor personnel, and can greatly improve the safety, reliability and practicality of the air-conditioning unit, providing strong technical support and guarantee for the development of the field of air-conditioning technology, and better eliminating safety hazards.

[0068] In an exemplary embodiment, an air conditioning unit and a control method thereof are provided. Figure 1 and Figure 2 As shown, the air conditioning unit may include a gas-liquid separator 11, an evaporator 13, a condenser 12, etc., and of course, may also include a compressor 14 and corresponding various pipelines, sensors, control valves, etc. In general, the condenser 12, the gas-liquid separator 11, and the compressor 14 may be located outdoors, and the evaporator 13 may be located indoors.

[0069] The pipeline between the condenser 12 and the evaporator 13 is marked as the first pipeline 31, and the first electric control valve 21 is provided on the first pipeline 31, and the first electric control valve 21 serves as the liquid side control valve of the refrigerant in the air conditioning unit. The pipeline between the gas-liquid separator 11 and the evaporator 13 is marked as the second pipeline 32, and the second electric control valve 22 is provided on the second pipeline 32, and the second electric control valve 22 serves as the gas side control valve of the refrigerant in the air conditioning unit.

[0070] Among them, the air-conditioning unit may also include an exhaust pipeline 33, which is located on the outdoor side of the air-conditioning unit, and an exhaust valve 23 is arranged on the exhaust pipeline 33. The inlet end of the exhaust pipeline 33 is connected with the second pipeline 32, and the connection position is located on the upstream side of the second electric control valve 22.

[0071] In this embodiment, after the air-conditioning unit detects the refrigerant leakage, the refrigerant sensor will receive a signal and respond quickly. At this time, the first electric control valve 21 can be closed first, and the compressor 14 can recover the refrigerant. After a certain period of time, the air-conditioning unit can cut off the connection between the indoor and outdoor units in the air-conditioning unit by closing the second electric control valve 22, that is, cut off the connection between the indoor equipment and the outdoor equipment, so as to reduce the further accumulation and leakage of the refrigerant to the indoor side, and avoid the danger caused by the accumulation of refrigerant on the indoor side to reach a flammable concentration.

[0072] It should be noted that the air conditioning unit will cut off the connection between the internal and external units each time the power is cut off, and will reset and restore the connection between the internal and external units after the power is turned on again. During this process, the first electric control valve 21 and the second electric control valve 22 will also experience power off and power on. Electric control valves (such as electric ball valves) generally have a certain life limit. There is a risk of failure of the first electric control valve 21 and the second electric control valve 22 during frequent power off and power on processes, and they cannot play a good protective role when refrigerant leaks, resulting in safety hazards in the air conditioning unit.

[0073] On this basis, in this implementation, in order to ensure that the air-conditioning unit can take safe and effective measures when a refrigerant leak occurs, an exhaust pipeline 33 is added to the upstream side of the second electric control valve 22 in the second pipeline 32, and an exhaust valve 23 is set in the exhaust pipeline 33. When the first electric control valve 21 and / or the second electric control valve 22 fails, the refrigerant can be discharged to the outside of the room by opening the exhaust valve 23 to prevent the refrigerant from further gathering and leaking to the inside of the room, thereby protecting the unit and personal safety. Especially for air-conditioning units with flammable refrigerants, this embodiment can significantly reduce the risk of safety accidents such as fire and explosion caused by refrigerant leakage, effectively protect the integrity of the air-conditioning unit and the safety of life and property of indoor personnel, greatly improve the safety, reliability and practicality of the air-conditioning unit, provide strong technical support and guarantee for the development of the field of air-conditioning technology, and better eliminate safety hazards.

[0074] In some embodiments,

[0075] refer to Figure 1 and Figure 2 As shown, the air conditioning unit may include a gas-liquid separator 11, an evaporator 13, a condenser 12, a four-way valve 15, and a compressor 14. The gas-liquid separator 11, the condenser 12, the compressor 14, and the four-way valve 15 are located on the outdoor side, and the evaporator 13 is located on the indoor side. The gas-liquid separator 11 is connected to the evaporator 13, the evaporator 13 is connected to the condenser 12, and the inlet and outlet of the condenser 12, the gas-liquid separator 11, and the compressor 14 are connected through the four-way valve 15.

[0076] As a key component for switching between cooling and heating modes of the air-conditioning unit, the four-way valve 15 adopts an electromagnetic four-way reversing valve. Its valve body is made of brass, and the internal valve core moves flexibly, which can quickly and accurately respond to the command of the control system, change the flow direction of the refrigerant between the condenser 12, the evaporator 13, the gas-liquid separator 11 and the compressor 14, and realize the switching between cooling and heating modes.

[0077] The pipeline between the evaporator 13 and the condenser 12 is marked as the first pipeline 31, and the first pipeline 31 is provided with a first electric control valve 21, and the first pipeline 31 may also be provided with a throttling element 17 (such as a capillary tube). The pipeline between the gas-liquid separator 11 and the evaporator 13 is marked as the second pipeline 32, and the second electric control valve 22 is provided on the second pipeline 32. The first electric control valve 21 and the second electric control valve 22 are, for example, electric ball valves (of course, they can also be other types of electric control valves, which are not limited to this).

[0078] The upstream side of the second electric control valve 22 in the second pipeline 32 can be connected to the exhaust pipeline 33, and the exhaust pipeline 33 is provided with the exhaust valve 23. The upstream side of the second electric control valve 22 refers to the pipeline section between the second electric control valve 22 and the gas-liquid separator 11 in the second pipeline 32.

[0079] In this embodiment, when the air conditioning unit is in normal refrigeration operation, the compressor 14 absorbs the low-temperature and low-pressure gaseous refrigerant through the reversing action of the four-way valve 15, compresses it into a high-temperature and high-pressure state, and then discharges it into the condenser 12. In the condenser 12, the gaseous refrigerant exchanges heat with the outdoor air, releases heat and condenses into liquid refrigerant. The liquid refrigerant passes through the first electric control valve 21, and the first electric control valve 21 accurately adjusts the flow of the liquid refrigerant according to the control instructions generated by the air conditioning control system based on the feedback data of multiple sensors such as the indoor temperature sensor and the evaporator 13 temperature sensor, so that it enters the evaporator 13 at an appropriate flow rate. In the evaporator 13, the liquid refrigerant absorbs the heat of the indoor air and quickly evaporates into a gaseous refrigerant, and the gaseous refrigerant returns to the compressor 14 through the second electric control valve 22, completing a complete refrigeration cycle.

[0080] For example, when the indoor temperature is high and the humidity is high, the control system will comprehensively consider the temperature and humidity factors, appropriately increase the opening of the first electric control valve 21, increase the flow of liquid refrigerant entering the evaporator 13, and adjust the speed of the indoor fan 16 at the same time to increase the cooling capacity and reduce the indoor humidity, so that the indoor environment quickly reaches a comfortable state.

[0081] When the air conditioning unit switches to the heating mode, the four-way valve 15 is activated to change the flow direction of the refrigerant. The high-temperature and high-pressure gaseous refrigerant discharged by the compressor 14 first enters the evaporator 13, condenses and releases heat in the evaporator 13, and raises the indoor air temperature. After the gaseous refrigerant is condensed in the evaporator 13, it is converted into liquid refrigerant, and the liquid refrigerant enters the condenser 12 through the first electric control valve 21. In the condenser 12, the liquid refrigerant absorbs the heat of the outdoor air and evaporates into gaseous refrigerant, and then returns to the compressor 14 through the second electric control valve 22, forming a heating cycle. During the heating process, the opening of the second electric control valve 22 is dynamically adjusted according to the indoor temperature sensor and the temperature requirements set by the user. For example, when the indoor temperature is low, the control system increases the opening of the second electric control valve 22, increases the flow of gaseous refrigerant entering the evaporator 13, enhances the heating effect, and quickly raises the indoor temperature to a comfortable range.

[0082] When refrigerant leakage occurs in the air-conditioning unit, the refrigerant sensor will receive a signal and respond quickly. At this time, the first electric control valve 21 can be closed first, and the compressor 14 can recover the refrigerant. After a certain period of time, the air-conditioning unit can cut off the connection between the indoor and outdoor units in the air-conditioning unit by closing the second electric control valve 22, that is, cut off the connection between the indoor equipment and the outdoor equipment, so as to reduce the further accumulation and leakage of refrigerant to the indoor side, and avoid the danger caused by the accumulation of refrigerant on the indoor side to reach a flammable concentration.

[0083] In this embodiment, when the first electric control valve 21 and / or the second electric control valve 22 fails to normally cut off the refrigerant, for example, the valve core of the first electric control valve 21 is stuck in the open position or the motor of the second electric control valve 22 fails and cannot be closed, the refrigerant pressure in the second pipeline 32 will gradually increase. When the pressure exceeds the opening pressure of the exhaust valve 23, the exhaust valve 23 automatically opens to discharge the refrigerant to the outdoor side. This can effectively prevent the refrigerant from further leaking to the indoor side, prevent safety accidents caused by refrigerant leakage, and protect the unit equipment and the personal safety of indoor personnel.

[0084] It should be noted that the exhaust valve 23 may be opened automatically based on the above-mentioned method, or the exhaust valve 23 may be opened by controlling the control device, which is not limited to this.

[0085] In this embodiment, when the first electric control valve 21 on the liquid side and / or the second electric control valve 22 on the gas side fails, the exhaust valve 23 can be opened to discharge the refrigerant to the outside of the room, thereby preventing the refrigerant from further gathering and leaking to the inside of the room, and protecting the unit and personal safety. Especially for air-conditioning units with flammable refrigerants, the present disclosure can significantly reduce the risk of fires, explosions and other safety accidents caused by refrigerant leakage, effectively protect the integrity of the air-conditioning unit and the safety of life and property of indoor personnel, greatly improve the safety, reliability and practicality of the air-conditioning unit, provide strong technical support and guarantee for the development of the field of air-conditioning technology, and better eliminate safety hazards.

[0086] In an exemplary embodiment, an air conditioning unit and a control method thereof are provided. Figure 1 and Figure 2 As shown, the air conditioning unit may include a control device, and the first electric control valve 21, the second electric control valve 22 and the exhaust valve 23 are electrically connected to the control device respectively. The control device may use a microprocessor chip as a core control unit, and has a powerful data processing capability and rich interface resources. It can integrate multiple sensor interfaces, including a refrigerant sensor interface, a temperature sensor interface, a pressure sensor interface, etc., and can collect various operating parameters of the air conditioning unit in real time. The control device may also be built with a special fault diagnosis algorithm for detecting the working status of key components such as the first electric control valve 21. The storage unit of the control device stores a preset control strategy to implement the control method in this embodiment.

[0087] Among them, the control device is configured to, when there is a refrigerant leakage in the air-conditioning unit, control the first electric control valve 21 to be in a closed state and the second electric control valve 22 to be in an open state. If it is determined that the first electric control valve 21 is faulty, the exhaust valve 23 is controlled to be in an open state.

[0088] The control device can determine whether the first electric control valve 21 is faulty through a built-in fault diagnosis algorithm. For example, if an abnormal valve core position feedback signal or motor drive current of the first electric control valve 21 is detected, it is determined that the first electric control valve 21 is faulty.

[0089] It should be noted that, when a refrigerant leak is detected in the air-conditioning unit, the control device can generally close the first electric control valve 21 first. At this time, the first electric control valve 21 is in a closed state and the second electric control valve 22 is in an open state. If the first electric control valve 21 is closed normally, after closing the first electric control valve 21 on the liquid side, the compressor 14 can better recover the refrigerant in the evaporator 13 and related pipelines. The compressor 14 is the power source for the refrigerant circulation. It sucks the gaseous refrigerant from the evaporator 13 and compresses it and sends it to the condenser 12. When the first electric control valve 21 is closed, new liquid refrigerant can be prevented from entering the evaporator 13, and the compressor 14 can suck back the remaining refrigerant in the evaporator 13 and the refrigerant that may leak into the pipeline near the evaporator 13, and concentrate it in the condenser 12 or other relatively safe storage areas. The purpose of this is to minimize the amount of refrigerant remaining on the indoor side and reduce the risk of refrigerant leaking into the indoor environment.

[0090] Based on this, after controlling the first electric control valve 21 to be in a closed state and the second electric control valve 22 to be in an open state, if it is determined that the first electric control valve 21 is faulty, the above-mentioned effect cannot be achieved. In this case, the exhaust valve 23 can be opened, that is, the exhaust valve 23 can be controlled to be in an open state, and the refrigerant in the air-conditioning unit can be discharged to the outdoor side through the exhaust pipe 33, so as to avoid further accumulation and leakage of the refrigerant to the indoor side, thereby protecting the unit and personal safety.

[0091] It should be noted that when the first electric control valve 21 is in a closed state and the second electric control valve 22 is in an open state, if the first electric control valve 21 is not faulty but is normally closed, the refrigerant will gradually concentrate on the high-pressure side of the air-conditioning unit, that is, the pressure on the high-pressure side of the air-conditioning unit will gradually increase. Therefore, in this embodiment, it can be determined whether the first electric control valve 21 is faulty by detecting the pressure on the high-pressure side.

[0092] The air conditioning unit may include a high-pressure detection device for detecting the high-pressure side pressure in the air conditioning unit. The high-pressure detection device may be, for example, a pressure sensor disposed at the outlet position of the compressor 14. The high-pressure detection device may be electrically connected to the control device. The control device may be configured to, in the event of a refrigerant leak in the air conditioning unit, control the first electric control valve 21 to be in a closed state and the second electric control valve 22 to be in an open state, and if it is determined that the pressure detected by the high-pressure detection device does not reach the first pressure threshold within a first time period, determine that the first electric control valve 21 is faulty.

[0093] That is to say, when there is a refrigerant leakage in the air-conditioning unit, after controlling the first electric control valve 21 to be in a closed state and the second electric control valve 22 to be in an open state, if it is determined that the high-pressure side pressure of the air-conditioning unit does not reach the first pressure threshold within a first time period, it is determined that there is a fault in the first electric control valve 21.

[0094] It should be noted that the first duration and the first pressure threshold can be set based on actual conditions, and their specific values ​​may not be limited. For example, the first duration may be 30 seconds, and the first pressure threshold may be 4.0 MP. That is to say, in the case of refrigerant leakage in the air-conditioning unit, after controlling the first electric control valve 21 to be in a closed state and the second electric control valve 22 to be in an open state, if it is determined that the high-pressure side pressure of the air-conditioning unit does not reach 4.0 MP within 30 seconds, it is determined that the first electric control valve 21 is faulty, and the exhaust valve 23 can be controlled to be in an open state.

[0095] In the process of controlling the exhaust valve 23 to be in the open state, the exhaust valve 23 can be opened from the closed state to the set opening, and then gradually opened from the set opening to the maximum opening, so as to avoid the exhaust valve 23 being opened too much at once and causing the refrigerant to accumulate on the outdoor side. For example, the maximum opening of the exhaust valve 23 corresponds to 300 steps. In the process of opening the exhaust valve 23, the exhaust valve 23 can be first opened to the opening corresponding to 50 steps (i.e., the set opening), and then slowly opened from the above set opening to the maximum opening corresponding to 300 steps.

[0096] In addition, the air conditioning unit may include an internal fan 16 and an air guide plate, and the internal fan 16 and the air guide plate are electrically connected to the control device respectively. It should be noted that the internal fan 16 can be electrically connected to the control device directly or indirectly through other devices. The air guide plate can be electrically connected to the control device directly or through other devices. For example, the air conditioning unit may include a drive motor for driving the air guide plate. The control device can be electrically connected to the drive motor to achieve indirect electrical connection with the air guide plate, so as to drive the air guide plate to open or close through the drive motor.

[0097] The control device may be configured to, when a refrigerant leak is detected in the air-conditioning unit and if it is determined that the first electric control valve 21 is faulty, increase the rotation speed of the internal fan 16 and control the air guide plate to be in an open state.

[0098] That is to say, after determining that there is a fault in the first electric control valve 21, the control device can control the speed of the internal fan 16 to increase, and can control the air guide plate to be in an open state, thereby preventing the refrigerant from accumulating in the closed structure inside the air-conditioning indoor unit, preventing it from reaching a flammable concentration, and reducing the risk.

[0099] It should be noted that the high-speed running internal fan 16 can generate a stronger airflow inside the air conditioner, causing the refrigerant gas that may leak into the closed structure inside the air conditioner to flow quickly with the airflow. At the same time, the control device controls the drive motor to adjust the air guide plate to an open state, so that a larger ventilation channel is formed between the inside of the air conditioner and the indoor environment. In this way, driven by the airflow, the refrigerant gas can diffuse into the indoor environment faster, avoiding accumulation in the closed structure inside the air conditioner to reach a flammable concentration, thereby reducing the risk of safety accidents such as fire and explosion caused by refrigerant leakage.

[0100] This embodiment can accurately determine whether the first electric control valve 21 is faulty, and can open the exhaust valve 23 in a more reasonable way when it is determined that the first electric valve is faulty, so that the refrigerant can be discharged to the outside of the room to avoid further accumulation and leakage of the refrigerant to the inside of the room, and the refrigerant can be prevented from accumulating on the outside of the room by opening the exhaust valve 23 too much, so as to better protect the unit and personal safety. Moreover, in this embodiment, by introducing synchronous control of the internal fan 16 and the air guide plate, the refrigerant can be better prevented from accumulating in the closed structure inside the air conditioner, and the flammable concentration can be avoided, thereby reducing the risk. Especially for air-conditioning units with flammable refrigerants, this embodiment can significantly reduce the risk of safety accidents such as fire and explosion caused by refrigerant leakage, effectively protect the integrity of the air-conditioning unit and the life and property safety of indoor personnel, and can greatly improve the safety, reliability and practicality of the air-conditioning unit, providing strong technical support and guarantee for the development of the field of air-conditioning technology, and better eliminating safety hazards.

[0101] In an exemplary embodiment, an air conditioning unit and a control method thereof are provided. Figure 1 and Figure 2 As shown, the air-conditioning unit may include a control device, and the first electric control valve 21, the second electric control valve 22 and the exhaust valve 23 are electrically connected to the control device respectively. The control device may use a microprocessor chip as a core control unit, and has powerful data processing capabilities and rich interface resources. It can integrate multiple sensor interfaces, including a refrigerant sensor interface, a temperature sensor interface, a pressure sensor interface, etc., and can collect various operating parameters of the air-conditioning unit in real time. The control device may also be built with a special fault diagnosis algorithm for detecting the working status of key components such as the first electric control valve 21. The storage unit of the control device stores a preset control strategy to implement the control method in this embodiment.

[0102] Among them, the control device can be configured to, when there is a refrigerant leakage in the air-conditioning unit, control the first electric control valve 21 and the second electric control valve 22 to be in a closed state, and if it is determined that the second electric control valve 22 is faulty, control the exhaust valve 23 to be in an open state.

[0103] It should be noted that, in the air-conditioning unit, after a refrigerant leakage is detected, the first electric control valve 21 is generally closed first, and the compressor 14 recovers the refrigerant. After a certain period of time, the air-conditioning unit can cut off the connection between the indoor and outdoor units in the air-conditioning unit by closing the second electric control valve 22, that is, cut off the connection between the indoor equipment and the outdoor equipment, so as to reduce the further accumulation and leakage of the refrigerant to the indoor side, and avoid the danger caused by the accumulation of refrigerant on the indoor side to reach a flammable concentration.

[0104] In this embodiment, after the control device closes the first electric control valve 21 to control the first electric control valve 21 to be in a closed state and the second electric control valve 22 to be in an open state, if it is determined that there is no fault in the first electric valve, that is, the first electric control valve 21 is normally closed (for example, the high-pressure side pressure of the air-conditioning unit does not reach the first pressure threshold within the first time period), the second electric control valve 22 can be closed after the compressor 14 recovers the refrigerant, so that both the first electric control valve 21 and the second electric control valve 22 are in a closed state.

[0105] It should be noted that different capacity models will be charged with different weights of refrigerant. According to different weights of refrigerant, different recovery times of the compressor 14 can be set. In this embodiment, it can be judged whether the compressor 14 has completed the recovery of the refrigerant based on the set recovery time. That is, if there is no fault in the first electric control valve 21, if the first electric control valve 21 is in a closed state and the second electric control valve 22 is in an open state for a continuous time that reaches the above recovery time, it is considered that the compressor 14 has completed the recovery of the refrigerant.

[0106] After controlling the first electric control valve 21 and the second electric control valve 22 to be in a closed state, the control device can determine whether the second electric control valve 22 has a fault through a built-in fault diagnosis algorithm. For example, if an abnormal valve core position feedback signal or an abnormal motor drive current of the second electric control valve 22 is detected, it is determined that the second electric control valve 22 has a fault.

[0107] In addition, after the first electric control valve 21 and the second electric control valve 22 are both in the closed state, if the second electric control valve 22 is not faulty, that is, the second electric control valve 22 is normally closed, the pressure on the low-pressure side of the air-conditioning unit will gradually increase. Therefore, in this embodiment, it can be determined whether the second electric control valve 22 is faulty by detecting the pressure on the low-pressure side of the air-conditioning unit.

[0108] The air conditioning unit may include a low pressure detection device for detecting the low pressure side pressure in the air conditioning unit. The low pressure detection device may be, for example, a pressure sensor disposed at the inlet position of the gas-liquid separator 11. The control device may be electrically connected to the low pressure detection device. The control device may be configured to, in the event of a refrigerant leak in the air conditioning unit, control the first electric control valve 21 and the second electric control valve 22 to be in a closed state, and if it is determined that the pressure detected by the low pressure detection device does not reach the second pressure threshold within a second time period, then determine that the second electric control valve 22 is faulty.

[0109] That is to say, when there is a refrigerant leakage in the air-conditioning unit, after controlling the first electric control valve 21 and the second electric control valve 22 to be in a closed state, if it is determined that the low-pressure side pressure of the air-conditioning unit does not reach the second pressure threshold within the second time period, it is determined that the second electric control valve 22 is faulty.

[0110] It should be noted that the second duration and the second pressure threshold can be set based on actual conditions, and their specific values ​​may not be limited. Moreover, the second duration may be the same as or different from the first duration. The second pressure threshold may be the same as or different from the first pressure threshold.

[0111] For example, the second time period may be 60 seconds, and the second pressure threshold may be 4.0 MPa. That is, in the case of refrigerant leakage in the air-conditioning unit, after controlling the first electric control valve 21 and the second electric control valve 22 to be in a closed state, if it is determined that the low-pressure side pressure of the air-conditioning unit does not reach 4.0 MPa within 60 seconds, it is determined that the second electric control valve 22 is faulty, and the exhaust valve 23 may be controlled to be in an open state.

[0112] In the process of controlling the exhaust valve 23 to be in an open state, the exhaust valve 23 can be opened from a closed state to a set opening, and then gradually opened from the set opening to a maximum opening, so as to avoid opening the exhaust valve 23 too much at once and causing the refrigerant to accumulate on the outdoor side. For example, the maximum opening of the exhaust valve 23 corresponds to 300 steps. In the process of opening the exhaust valve 23, the exhaust valve 23 can be first opened to an opening corresponding to 50 steps (i.e., the set opening), and then slowly opened from the above set opening to a maximum opening corresponding to 300 steps, so as to avoid opening the exhaust valve 23 too much at once and causing the refrigerant to accumulate on the outdoor side.

[0113] In addition, the air conditioning unit may include an internal fan 16 and an air guide plate, and the internal fan 16 and the air guide plate are electrically connected to the control device respectively. It should be noted that the internal fan 16 can be electrically connected to the control device directly or indirectly through other devices. The air guide plate can be electrically connected to the control device directly or through other devices. For example, the air conditioning unit may include a drive motor for driving the air guide plate. The control device can be electrically connected to the drive motor to achieve indirect electrical connection with the air guide plate, so as to drive the air guide plate to open or close through the drive motor.

[0114] The control device may be configured to, when a refrigerant leak is detected in the air-conditioning unit and if it is determined that the second electric control valve 22 is faulty, increase the rotation speed of the internal fan 16 and control the air guide plate to be in an open state.

[0115] That is to say, after determining that the second electric control valve 22 is faulty, the control device can control the speed of the internal fan 16 to increase, and can control the air guide plate to be in an open state, thereby preventing the refrigerant from accumulating in the closed structure inside the air-conditioning indoor unit, preventing it from reaching a flammable concentration, and reducing the risk.

[0116] It should be noted that the high-speed running internal fan 16 can generate a stronger airflow inside the air conditioner, causing the refrigerant gas that may leak into the closed structure inside the air conditioner to flow quickly with the airflow. At the same time, the control device controls the drive motor to adjust the air guide plate to an open state, so that a larger ventilation channel is formed between the inside of the air conditioner and the indoor environment. In this way, driven by the airflow, the refrigerant gas can diffuse into the indoor environment faster, avoiding accumulation in the closed structure inside the air conditioner to reach a flammable concentration, thereby reducing the risk of safety accidents such as fire and explosion caused by refrigerant leakage.

[0117] This embodiment can accurately determine whether the second electric control valve 22 is faulty, and can open the exhaust valve 23 in a more reasonable manner when it is determined that the second electric valve is faulty, so that the refrigerant can be discharged to the outside of the room to prevent the refrigerant from further gathering and leaking to the inside of the room, and can also avoid opening the exhaust valve 23 too wide to cause the refrigerant to accumulate on the outside of the room, so as to better protect the unit and personal safety. Especially for air-conditioning units with flammable refrigerants, this embodiment can significantly reduce the risk of safety accidents such as fire and explosion caused by refrigerant leakage, effectively protect the integrity of the air-conditioning unit and the safety of life and property of indoor personnel, greatly improve the safety, reliability and practicality of the air-conditioning unit, provide strong technical support and guarantee for the development of the field of air-conditioning technology, and better eliminate safety hazards.

[0118] The professionals should also be further aware that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0119] It should be noted that the phrases "one implementation", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0120] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more limiting values, the elements defined by the sentence "comprise a..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0121] The above embodiments are only preferred embodiments for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present application is within the protection scope of the present application.

Claims

1. An air conditioning unit, characterized in that: In the air conditioning unit, the pipeline between the condenser and the evaporator is marked as a first pipeline, and the pipeline between the gas-liquid separator and the evaporator is marked as a second pipeline. A first electric control valve is provided on the first pipeline, and a second electric control valve is provided on the second pipeline. Wherein, the air conditioning unit also includes an exhaust pipeline, the exhaust pipeline is located on the outdoor side, and an exhaust valve is arranged on the exhaust pipeline. The inlet end of the exhaust pipeline is connected with the second pipeline, and the connection position is located on the upstream side of the second electric control valve.

2. The air conditioning unit according to claim 1, characterized in that: The air conditioning unit comprises a control device, and the first electric control valve, the second electric control valve and the exhaust valve are electrically connected to the control device respectively; The control device is configured to, when there is a refrigerant leak in the air-conditioning unit, control the first electric control valve to be in a closed state and the second electric control valve to be in an open state, and then control the exhaust valve to be in an open state if it is determined that the first electric control valve is faulty.

3. The air conditioning unit according to claim 2, characterized in that: The air conditioning unit comprises a high-voltage detection device, the high-voltage detection device is used to detect the high-pressure side pressure in the air conditioning unit, and the control device is electrically connected to the high-voltage detection device; The control device is configured to, when there is a refrigerant leakage in the air-conditioning unit, control the first electric control valve to be in a closed state and the second electric control valve to be in an open state, and then determine that there is a fault in the first electric control valve if it is determined that the high-pressure side pressure detected by the high-pressure detection device does not reach a first pressure threshold within a first time period.

4. The air conditioning unit according to claim 2, characterized in that: The air conditioning unit comprises an internal fan and an air guide plate, wherein the internal fan and the air guide plate are electrically connected to the control device respectively; The control device is configured to, when a refrigerant leakage is detected in the air-conditioning unit and if it is determined that the first electric control valve is faulty, increase the rotation speed of the internal fan and control the air guide plate to be in an open state.

5. The air conditioning unit according to claim 1, characterized in that: The air conditioning unit comprises a control device, and the first electric control valve, the second electric control valve and the exhaust valve are electrically connected to the control device respectively; Wherein, the control device is configured to, when there is a refrigerant leakage in the air-conditioning unit, control the first electric control valve and the second electric control valve to be in a closed state, and if it is determined that the second electric control valve is faulty, control the exhaust valve to be in an open state.

6. The air conditioning unit according to claim 5, characterized in that: The air conditioning unit comprises a low-pressure detection device, the low-pressure detection device is used to detect the low-pressure side pressure in the air conditioning unit, and the control device is electrically connected to the low-pressure detection device; In which, the control device is configured to, when there is a refrigerant leakage in the air-conditioning unit, control the first electric control valve and the second electric control valve to be in a closed state. If it is determined that the low-pressure side pressure detected by the low-pressure detection device does not reach the second pressure threshold within a second time period, it is determined that there is a fault in the second electric control valve.

7. The air conditioning unit according to claim 5, characterized in that: The air conditioning unit comprises an internal fan and an air guide plate, wherein the internal fan and the air guide plate are electrically connected to the control device respectively; The control device is configured to, when a refrigerant leakage is detected in the air-conditioning unit and if it is determined that the second electric control valve is faulty, increase the rotation speed of the internal fan and control the air guide plate to be in an open state.

8. The air conditioning unit according to any one of claims 1 to 7, characterized in that: The first electric control valve and / or the second electric control valve comprises an electric ball valve.

9. A control method, characterized in that: The control method is applied to the air-conditioning unit according to any one of claims 1 to 8, in which the pipeline between the condenser and the evaporator is recorded as the first pipeline, the pipeline between the gas-liquid separator and the evaporator is recorded as the second pipeline, the first pipeline is provided with a first electric control valve, the second pipeline is provided with a second electric control valve, the air-conditioning unit further comprises an exhaust pipeline, the exhaust pipeline is located on the outdoor side of the air-conditioning unit, and the exhaust pipeline is provided with an exhaust valve, the inlet end of the exhaust pipeline is connected to the second pipeline, and the connection position is located on the upstream side of the second electric control valve; The control method comprises: When refrigerant leakage is detected in the air-conditioning unit, the first electric control valve is controlled to be in a closed state and the second electric control valve is controlled to be in an open state. If it is determined that the first electric control valve is faulty, the exhaust valve is controlled to be in an open state.

10. The control method according to claim 9, characterized in that: Determining whether the first electric control valve is faulty includes: In the event that there is a refrigerant leak in the air-conditioning unit, after controlling the first electric control valve to be in a closed state and the second electric control valve to be in an open state, if it is determined that the high-pressure side pressure of the air-conditioning unit does not reach the first pressure threshold within a first time period, it is determined that there is a fault in the first electric control valve.

11. The control method according to claim 9, characterized in that: The air conditioning unit includes an internal fan and an air guide plate, and the control method includes: When a refrigerant leak is detected in the air-conditioning unit, if it is determined that the first electric control valve is faulty, the rotation speed of the internal fan is increased and the air guide plate is opened.

12. The control method according to claim 9, characterized in that: The control method further comprises: In the case of refrigerant leakage in the air-conditioning unit, after controlling the first electric control valve to be in a closed state and the second electric control valve to be in an open state, if it is determined that the first electric control valve has no fault, controlling the second electric control valve to be in a closed state; In the event of a refrigerant leak in the air-conditioning unit, after the first electric control valve and the second electric control valve are both controlled to be in a closed state, if it is determined that the second electric control valve is faulty, the exhaust valve is controlled to be in an open state.

13. The control method according to claim 12, characterized in that: The determining that the second electric control valve has a fault includes: In the event of refrigerant leakage in the air-conditioning unit, after controlling the first electric control valve and the second electric control valve to be in a closed state, if it is determined that the low-pressure side pressure of the air-conditioning unit does not reach the second pressure threshold within a second time period, it is determined that the second electric control valve is faulty.

14. The control method according to claim 12, characterized in that: The air conditioning unit includes an internal fan and an air guide plate, and the control method includes: When a refrigerant leak is detected in the air-conditioning unit, if it is determined that the second electric control valve is faulty, the rotation speed of the internal fan is increased and the air guide plate is opened.

15. The control method according to any one of claims 9 to 14, characterized in that: The step of controlling the exhaust valve to be in an open state comprises: The exhaust valve is opened from a closed state to a set opening, and then gradually opened from the set opening to a maximum opening.

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