Air conditioning system and control method for blocking refrigerant leakage

Abstract

The present application relates to the technical field of air conditioners, and specifically provides an air conditioning system and control method for blocking refrigerant leakage, aiming to solve the problem of potential risks posed by existing air conditioning systems due to the inability to block refrigerant leakage in time. For this purpose, the air conditioning system of the present application comprises: a liquid-side control valve connected and arranged between a throttling device of the air conditioning system and an evaporator of the air conditioning system; an air-side control valve connected and arranged between a compressor of the air conditioning system and the evaporator of the air conditioning system; a refrigerant concentration detector arranged on the evaporator and configured to detect the refrigerant concentration in the space around the evaporator; and a controller, selectively controlling the working states of the liquid-side control valve and the air-side control valve on the basis of a detection value of the refrigerant concentration detector. The present invention can not only automatically block refrigerant leakage, but also reduce the number of parts in a loop of the air conditioning system, reduce assembly welding points, and reduce the costs of production.

Description

Air conditioning system and control method for blocking refrigerant leakage

[0001] This application claims priority to Chinese patent application No. 202310946263.0, filed on July 28, 2023, with the invention name “Air conditioning system and control method for blocking refrigerant leakage”. The entire contents of the above Chinese patent application are incorporated into this application by reference. Technical Field

[0002] The present application relates to the technical field of air conditioning, and specifically provides an air conditioning system and a control method for blocking refrigerant leakage. Background Art

[0003] Refrigerant is an important component of air-conditioning systems. Some refrigerants used in air-conditioning systems today are flammable and explosive substances, such as R32 refrigerant. When such refrigerants leak into the room through the evaporator, they will pose a potential risk.

[0004] Currently, existing air conditioning systems typically incorporate a shutoff valve within the system circuit. This valve is typically located in the outdoor unit and requires manual opening and closing. However, if a refrigerant leak occurs in the indoor unit while the air conditioner is running, the shutoff valve cannot automatically close, causing refrigerant to continuously leak into the room. This can lead to explosions due to the increasing refrigerant concentration.

[0005] Accordingly, a method for blocking refrigerant leakage is needed in the art to solve the above problem.

[0006] Summary of the Invention

[0007] The present application aims to solve the above technical problem, that is, to solve the problem that the existing air-conditioning system poses potential risks due to the inability to block refrigerant leakage in time.

[0008] In a first aspect, the present application provides an air conditioning system for preventing refrigerant leakage, comprising:

[0009] a liquid-side control valve, which is arranged in communication between the throttling device of the air-conditioning system and the evaporator of the air-conditioning system;

[0010] an air-side control valve, which is connected between the compressor of the air-conditioning system and the evaporator of the air-conditioning system;

[0011] a refrigerant concentration detector, which is provided on the evaporator and is used to detect the refrigerant concentration in the space around the evaporator; and

[0012] A controller selectively controls the working states of the liquid-side control valve and the gas-side control valve according to the detection value of the refrigerant concentration detector.

[0013] When adopting the above-mentioned technical solution, the present application not only can automatically block the leakage of refrigerant when the refrigerant leaks in the indoor unit through the cooperation of the refrigerant concentration detector with the liquid side control valve and the gas side control valve, but also the present application uses two control valves in series in the air-conditioning circuit to replace the combination of the shut-off valve and the electronic expansion valve in the existing method, which can reduce the number of components in the air-conditioning system circuit, reduce assembly welding points, and at the same time reduce production costs and improve system reliability.

[0014] In a technical solution of the above air-conditioning system, the liquid-side control valve and the gas-side control valve are both electric ball valves.

[0015] When the above technical solution is adopted, the electric ball valve has a larger adjustment range of opening than the electronic expansion valve. When the air-conditioning system is in normal operation, the electric ball valve is in the maximum opening state and will not cause resistance to the flow of refrigerant. Therefore, compared with control valves such as electronic expansion valves, the electric ball valve can reduce the pressure loss of refrigerant operation and improve the power and energy efficiency of the air-conditioning system.

[0016] In a technical solution of the above-mentioned air-conditioning system, the control power supplies of the liquid-side control valve and the gas-side control valve are both provided with manual reset switches.

[0017] When the above technical solution is adopted, the power-on operation of the liquid-side control valve and the gas-side control valve can be manually controlled to avoid refrigerant leakage.

[0018] In one technical solution of the above air-conditioning system, the air-conditioning system further comprises:

[0019] A pressure relief valve has one end connected between the liquid side control valve and the condenser, and the other end connected between the gas side control valve and the four-way valve of the air conditioning system.

[0020] When the above technical solution is adopted, during the operation of the air conditioner, when the liquid-side control valve and the gas-side control valve are abnormally closed and the pressure of the outdoor unit system is too high, the pressure relief valve opens to achieve connectivity between the high-pressure side and the low-pressure side circuits, balancing the pressure in the air-conditioning system and avoiding excessive pressure in some circuits within the air conditioner due to system abnormalities, thereby reducing risks.

[0021] In a second aspect, the present application provides a control method for blocking refrigerant leakage, wherein the control method is applied to an air-conditioning system, the air-conditioning system comprising:

[0022] a liquid-side control valve, which is arranged in communication between the throttling device of the air-conditioning system and the evaporator of the air-conditioning system;

[0023] an air-side control valve, which is connected between the compressor of the air-conditioning system and the evaporator of the air-conditioning system;

[0024] a refrigerant concentration detector, which is provided on the evaporator and is used to detect the refrigerant concentration in the space around the evaporator;

[0025] The control method includes:

[0026] obtaining the refrigerant concentration in the space around the evaporator by means of the refrigerant concentration detector;

[0027] Determining whether the refrigerant concentration is greater than a preset concentration value;

[0028] The working states of the liquid-side control valve and the gas-side control valve are selectively controlled according to the judgment result.

[0029] When the above technical solution is adopted, the refrigerant concentration is monitored in real time, and the refrigerant blocking program is selected to effectively block the leakage of the refrigerant.

[0030] In one technical solution of the above control method, the step of “selectively controlling the working states of the liquid-side control valve and the gas-side control valve according to the judgment result” specifically includes:

[0031] Confirming that the refrigerant concentration is greater than a preset concentration value;

[0032] Controlling the air conditioning system to operate in cooling mode;

[0033] Adjusting the working states of the liquid-side control valve and the gas-side control valve to recover the refrigerant in the air-conditioning system; and / or

[0034] Confirm that the refrigerant concentration is less than or equal to a preset concentration value;

[0035] The air conditioning system is controlled to operate normally in the current mode.

[0036] When the above technical solution is adopted, after the refrigerant concentration detector detects a refrigerant leak, the refrigerant is directly recovered, so that all the refrigerant in the indoor unit is recovered to the outdoor unit, reducing the residual amount of refrigerant in the indoor unit.

[0037] In one technical solution of the above control method, the step of “controlling the air-conditioning system to operate in cooling mode” specifically includes:

[0038] The air conditioning system is controlled to operate in a cooling mode for a first preset time period.

[0039] When the above technical solution is adopted, it is ensured that the air-conditioning system can operate stably after switching to cooling mode.

[0040] In one technical solution of the above control method, the step of “adjusting the working states of the liquid-side control valve and the gas-side control valve to recover the refrigerant in the air-conditioning system” specifically includes:

[0041] Controlling the liquid side control valve to close;

[0042] When the detection value of the low-pressure pressure detector at the return air end of the compressor is less than a preset pressure value, the compressor and the air-side control valve are controlled to be closed.

[0043] When the above technical solution is adopted, the compressor and the air side control valve are controlled to be closed within a certain period of time before the low-pressure protection switch disconnects the protection, so as to prevent the compressor from being damaged due to excessive refrigerant recovery time.

[0044] In one technical solution of the above control method, the step of “adjusting the working states of the liquid-side control valve and the gas-side control valve to recover the refrigerant in the air-conditioning system” specifically includes:

[0045] Controlling the liquid side control valve to close;

[0046] After the air conditioning system has been running for a third preset time, the compressor and the air-side control valve are controlled to be closed.

[0047] When the above technical solution is adopted, when the air conditioner operation time reaches the third preset time, the system automatically controls the compressor and the air side control valve to close, thereby effectively avoiding the phenomenon of compressor damage caused by human operation factors.

[0048] In one technical solution of the above control method, the third preset time length is 30-90 seconds.

[0049] In one technical solution of the above control method, after the step of “confirming that the refrigerant concentration is greater than a preset concentration value”, the control method further includes:

[0050] The electronic expansion valve is controlled to be adjusted to a maximum opening state and to operate for a second preset time period.

[0051] When the above technical solution is adopted, the refrigerant recovery speed can be improved.

[0052] In one technical solution of the above control method, the gas-side control valve and the liquid-side control valve are respectively electrically connected to a backup power supply, and the control method further includes:

[0053] When the air conditioning system is abnormally powered off, the backup power supply starts and controls the gas-side control valve and the liquid-side control valve to be closed respectively.

[0054] When the above technical solution is adopted, the phenomenon of refrigerant leakage caused by abnormal power failure can be effectively prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] The preferred embodiments of the present application are described below with reference to the accompanying drawings, in which:

[0056] FIG1 is a schematic diagram of an air conditioning system for preventing refrigerant leakage according to an embodiment of the present application;

[0057] FIG2 is another schematic diagram of an air conditioning system for preventing refrigerant leakage according to an embodiment of the present application;

[0058] FIG3 is a flow chart of the main steps of a control method for blocking refrigerant leakage provided in an embodiment of the present application;

[0059] FIG4 is a flowchart of detailed steps of a control method for blocking refrigerant leakage provided in an embodiment of the present application;

[0060] FIG5 is a detailed flowchart of the control method shown in FIG3 ;

[0061] FIG6 is a detailed flowchart of the control method shown in FIG3 ;

[0062] FIG7 is a flowchart showing the detailed steps of a control method for blocking refrigerant leakage according to an embodiment of the present application.

[0063] In the figures, the reference numerals refer to the following:

[0064] 1. Compressor; 2. Condenser; 3. Throttling device; 4. Evaporator; 5. Liquid side control valve; 6. Gas side control valve; 7. Refrigerant concentration detector; 8. Pressure relief valve. DETAILED DESCRIPTION

[0065] The preferred embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely intended to illustrate the technical principles of the present application and are not intended to limit the scope of protection of the present application. Those skilled in the art may adjust these embodiments as needed to suit specific applications.

[0066] It should be noted that in the description of this application, terms such as "upper," "lower," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is for ease of description only and does not indicate or imply that the relevant devices or components must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be understood as limitations on this application. In addition, ordinal numbers such as "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0067] In addition, in the description of the present application, the term "A and / or B" represents all possible combinations of A and B, such as only A, only B, or A and B. The term "at least one of A or B" or "at least one of A and B" has a similar meaning to "A and / or B" and may include only A, only B, or A and B. The singular forms "a" and "the" may also include plural forms.

[0068] In existing air-conditioning systems, two stop valves are generally installed on the outdoor unit. The function of this stop valve is to block the refrigerant in the outdoor unit and the indoor unit during the installation or relocation of the air conditioner. Moreover, it needs to be opened and closed by manual control. Therefore, it is obviously impossible to achieve automatic blocking of the refrigerant.

[0069] To address this issue, some related technologies employ the practice of connecting electronic expansion valves in series on either side of the two shutoff valves. This approach, when a refrigerant leak occurs, controls the operating state of the electronic expansion valves to disconnect the air conditioning system's indoor and outdoor unit circuits, thereby preventing further refrigerant flow to the indoor units. However, this approach results in an increase in components and solder points within the air conditioning circuit, which in turn increases manufacturing costs. Furthermore, the electronic expansion valve's serial connection within the air conditioning system's gas-side circuit, due to its inherent structural influence, increases refrigerant pressure loss during normal operation, thereby impacting the system's power and energy efficiency.

[0070] 1 , an air-conditioning system for blocking refrigerant leakage disclosed in the present application includes a compressor 1, a condenser 2, a throttling device 3, an evaporator 4, a liquid side control valve 5, a gas side control valve 6, a refrigerant concentration detector 7 and a controller (not shown in the figure).

[0071] The connection relationship between the compressor 1, condenser 2, throttling device 3, and evaporator 4 is common knowledge in the art and will not be described in detail in this application. In this application, the throttling device adopts an electronic expansion valve, but other throttling elements may also be adopted, and this application does not limit this.

[0072] The liquid side control valve 5 and the gas side control valve 6 are connected in series in the circuit of the air-conditioning system. Specifically, the liquid side control valve 5 is connected and arranged between the electronic expansion valve 3 and the evaporator 4, and the gas side control valve 6 is connected and arranged between the compressor 1 and the evaporator 4. More specifically, the gas side control valve 6 is located between the four-way valve and the evaporator of the air-conditioning system.

[0073] The refrigerant concentration detector 7 is disposed on the surface of the evaporator 4 and is used to detect the refrigerant concentration in the space around the evaporator 4 .

[0074] The controller selectively controls the working states of the liquid side control valve 5 and the gas side control valve 6 according to the detection value of the refrigerant concentration detector 7. It should be noted that when the air conditioner is operating normally, the liquid side control valve 5 and the gas side control valve 6 are in a normally open state to ensure that the air conditioning system can operate normally. For example, in one implementation of the present application, during the operation of the air conditioning system, when the coil of the evaporator 4 is damaged and causes refrigerant leakage, the refrigerant concentration detector 7 detects that the refrigerant concentration is greater than the preset concentration value, then the controller controls the liquid side control valve 5 and the gas side control valve 6 to close, and at the same time controls the compressor 1 to stop, thereby preventing the refrigerant from continuing to flow to the indoor unit.

[0075] In a possible implementation of the present application, both the gas-side control valve 6 and the liquid-side control valve 5 use electric ball valves. Compared with the electronic expansion valve, the electric ball valve has a larger adjustment range of the opening. When the air-conditioning system is in normal operation, the electric ball valve is in the maximum opening state and will not cause resistance to the flow of refrigerant. Therefore, compared with the electronic expansion valve, the electric ball valve can reduce the pressure loss of the refrigerant operation, reduce power, and improve the energy efficiency of the air-conditioning system.

[0076] It should be noted that both the liquid-side control valve 5 and the gas-side control valve 6 are equipped with manual reset switches. Of course, the liquid-side control valve 5 and the gas-side control valve 6 can also use a single manual reset switch. When the air conditioner leaves the factory, the liquid-side control valve 5 and the gas-side control valve 6 are both in a normally closed state to prevent refrigerant leakage. Furthermore, the power supply for controlling the liquid-side control valve 5 and the gas-side control valve 6 needs to be set via a manual reset switch. That is, even if the air conditioner's outdoor unit is powered on, the gas-side control valve 6 and the liquid-side control valve 5 will not automatically power on. This prevents the gas-side control valve 5 and the liquid-side control valve 6 from automatically opening during the air conditioner's connection to the indoor unit and causing refrigerant leakage. After the indoor and outdoor units are connected and the online pipe is leak-checked and evacuated, the power reset switch needs to be turned on via the manual reset switch. When the liquid-side control valve 5 and the gas-side control valve 6 are powered on for the first time, they need to be initialized, first fully closed, then fully opened, and then maintained.

[0077] This application replaces the original stop valve with two electric ball valves. At the same time, on the liquid side and the gas side, one electric ball valve replaces the combination of the stop valve and the electronic expansion valve in the related technology. This not only reduces the number of components in the air-conditioning system loop, but also reduces the assembly welding points, reduces costs, and improves system reliability.

[0078] Referring to Figure 2 , it should be noted that in some other implementations of the present application, to simplify the system and reduce costs, the liquid-side control valve 5 can be replaced with a conventional shut-off valve. In this way, the refrigerant is blocked on the liquid side via the electronic expansion valve 3 in the main circuit. When the electronic expansion valve 3 is used for blocking, the electronic expansion valve should also have a backup power supply. Of course, the electronic expansion valve 3 in the liquid-sensing main circuit can also be removed, and the liquid-sensing control valve 5 can be used directly to achieve throttling and blocking.

[0079] 1 , in a possible implementation of the present application, the air-conditioning system further includes a pressure relief valve 8, one end of the pressure relief valve 8 being connected between the liquid-side control valve 5 and the condenser 2, and the other end being connected between the gas-side control valve 6 and the four-way valve of the air-conditioning system. During the operation of the air-conditioning, when the liquid-side control valve 5 and the gas-side control valve 6 are abnormally closed, and the compressor 1 is still in operation, the pressure relief valve 8 is opened to achieve connectivity between the high-pressure side and low-pressure side circuits of the outdoor unit, balance the high and low pressures in the outdoor unit circuit of the air-conditioning system, and avoid the phenomenon of excessive pressure in some circuits within the air-conditioning system due to system abnormalities, thereby reducing risks. It is also understandable that when adopting the method in FIG2 , one end of the pressure relief valve 8 is connected between the electronic expansion valve 3 and the condenser 2, and the other end is connected between the gas-side control valve 6 and the four-way valve of the air-conditioning system.

[0080] 3 , a control method for blocking refrigerant leakage disclosed in the present application is shown. The method adopts the control system for blocking refrigerant leakage in any of the above embodiments and mainly includes the following steps:

[0081] S101: When the air conditioning system is in operation, the refrigerant concentration in the space around the evaporator is obtained through a refrigerant concentration detector.

[0082] S102: Determine whether the refrigerant concentration is greater than a preset concentration value.

[0083] S103: Selectively controlling the working states of the liquid-side control valve and the gas-side control valve according to the judgment result.

[0084] It should be noted that in step S102, the specific value of the preset concentration value represents the degree of refrigerant leakage. That is, a larger value of the preset concentration value indicates a higher degree of refrigerant leakage, while a smaller value of the preset concentration value indicates a lower degree of refrigerant leakage. The purpose of step S103 is to control the operation of the liquid-side control valve and the gas-side control valve when the refrigerant concentration exceeds the preset concentration value, thereby preventing further refrigerant leakage. Therefore, it is understandable that a larger value of the preset concentration value indicates a higher degree of refrigerant leakage to be tolerated. In this case, step S103 will not proceed until a certain amount of refrigerant leakage has occurred. However, the specific value of the preset concentration value should be set based on the premise that the refrigerant leakage will not cause harm to the user. Conversely, a smaller value of the preset concentration value indicates a lower degree of refrigerant leakage to be tolerated. In this case, the amount of refrigerant leakage allowed is lower, which is safer. However, the specific value of the preset concentration value should not be too low, as a too low preset concentration value may cause system malfunction.

[0085] It should also be noted that in step S101 , when the air conditioning system is in operation, both the liquid-side control valve and the gas-side control valve are in an open state, and both are in a maximum opening state.

[0086] 4 , as a possible implementation of the control method of the present application, step S103 specifically includes:

[0087] S1031: Confirm that the refrigerant concentration is greater than the preset concentration value.

[0088] S1032: Control the air conditioning system to operate in cooling mode.

[0089] In step S1032, if the initial operating mode of the air-conditioning system is cooling mode or dehumidification mode, it can maintain the original state and continue to operate. If the initial operating mode of the air-conditioning system is heating mode, the air-conditioning system is automatically controlled to directly switch to cooling mode for refrigerant recovery.

[0090] S1033: Adjust the working status of the liquid-side control valve and the gas-side control valve to recover the refrigerant in the air-conditioning system.

[0091] In the above steps, after the refrigerant concentration detector detects a refrigerant leak, the refrigerant is directly recovered, so that all the refrigerant in the indoor unit is recovered to the outdoor unit, reducing the residual amount of refrigerant in the indoor unit.

[0092] In step S1032, after the air conditioning system is controlled to operate in cooling mode, it is operated in cooling mode for a first preset time period to ensure that the refrigerant in the air conditioning system circuit is running stably. Of course, if the air conditioning system is initially operated in cooling mode, the first preset time period is not required.

[0093] The specific value of the first preset time can be determined according to actual needs. For example, the first preset time is 10-20 seconds. The specific setting principle is that the air-conditioning system can operate stably after switching to the cooling mode. At the same time, it should also avoid the continuous increase of refrigerant leakage due to the first preset time being too long.

[0094] In a possible implementation of the present application, after step S1031, the control method may further include:

[0095] S10311: Adjust the electronic expansion valve to the maximum opening state and run it for the second preset time.

[0096] The purpose of step S10311 is to increase the refrigerant recovery speed. The specific value of the second preset time can be determined according to actual needs, and in order to prevent excessive refrigerant leakage, its specific value should not be too large. For example, the second preset time can be 10 seconds, 15 seconds, etc.

[0097] 5 , in a possible implementation of the present application, the specific steps of step S1033 include:

[0098] S10331: The control valve on the control liquid side is closed.

[0099] S10332: Determine whether the detection value of the low-pressure pressure detector at the return air end of the compressor is less than the preset pressure value. When the detection value of the low-pressure pressure detector at the return air end of the compressor is less than the preset pressure value, control the compressor, outdoor unit fan and the air side control valve to close.

[0100] It should be understood that in the air-conditioning system, the exhaust end of the compressor is generally provided with a high-pressure pressure detector and equipped with a high-pressure protection switch. When the exhaust pressure of the compressor is higher than the set high-pressure pressure value, the compressor can be shut down for protection. At the same time, the return air end of the compressor is generally provided with a low-pressure pressure detector and equipped with a low-pressure protection switch. When the return air pressure of the compressor is lower than the set low-pressure pressure value, the compressor can also be shut down for protection. In the present application, for the refrigerant recovery process, a preset pressure value is set for the low-pressure pressure detector. The value of the preset pressure value should be greater than the pressure value corresponding to the shutdown protection of the low-pressure protection switch, so that within a certain period of time before the low-pressure pressure protection switch disconnects the protection, the compressor and the air-side control valve are controlled to be closed, to prevent the refrigerant recovery time from being too long, and the ambient air from entering the air-conditioning system along the leakage point, while preventing the compressor from being damaged due to the long refrigerant recovery time.

[0101] 6 , in another possible implementation of the present application, the specific steps of step S1033 include:

[0102] S10331: The control valve on the control liquid side is closed.

[0103] S10333: Determine whether the operating time of the air-conditioning system reaches a third preset time. When the air-conditioning system has been running for the third preset time, control the compressor and the air-side control valve to close.

[0104] In the refrigerant recovery process of air conditioners, the recovery time is generally determined by the user or worker's experience, that is, if the user or worker subjectively determines that the refrigerant recovery time has reached the expected time, the compressor will be controlled to shut down. However, this method may be affected by human factors, resulting in unclean refrigerant recovery, or the compressor may be damaged in a high-temperature environment due to excessive refrigerant recovery time. Therefore, in step S10332 of the present application, a third preset time is automatically determined or set based on the detection of low pressure in the refrigerant recovery procedure of the air conditioning system. When the air conditioning operation time reaches the third preset time, the system automatically controls the compressor and the air-side control valve to close, thereby effectively avoiding the occurrence of the above phenomenon and minimizing the damage to the compressor.

[0105] The specific value of the third preset duration can be determined based on actual needs. The third preset duration is generally set within the range of 30-90 seconds. For example, the third preset duration can be set to 60 seconds based on needs. The specific duration depends on the air conditioner operating status and refrigerant charge and is not specifically limited.

[0106] 7 , in a possible implementation of the present application, the gas-side control valve and the liquid-side control valve are electrically connected to a backup power supply, and the control method further includes the following steps:

[0107] S1034: When the air conditioning system is abnormally powered off, the backup power supply starts and controls the gas side control valve and the liquid side control valve to be closed respectively.

[0108] It should be noted that in step S1034, during operation of the air conditioning system, when the air conditioner reaches the set temperature and shuts down or receives a user shutdown signal, the air conditioner performs a normal shutdown or shutdown procedure, and the backup power supply does not need to be activated. When the air conditioner receives a shutdown signal (temperature sensor OFF mode) indicating that the set temperature has been reached, the compressor and fan shut down normally, and the air-side control valve and the liquid-side control valve remain fully open to avoid repeated operation and shortening the service life. When the outdoor unit receives an active shutdown signal from the indoor unit, it can be assumed that the user does not need to use the air conditioner. After the air conditioner shuts down, the air-side control valve and the liquid-side control valve are closed. In the scenario described in step S1034, that is, when the air conditioner loses power abnormally, step S1034 is executed to block the refrigerant, thereby preventing refrigerant leakage during the abnormal power outage.

[0109] It should be noted that this application describes the case where the air-conditioning system has one indoor unit, but the application of this application is not limited to this. This application is also applicable to application scenarios where the air-conditioning system has multiple indoor units.

[0110] So far, the technical solution of the present application has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art can make equivalent component position changes or replacements to the relevant technical features, such as assisting other improvements to move the control valve to the online pipe or indoor side pipe, such as changing the electronic expansion valve in the system to a capillary tube or a thermal expansion valve; or removing the throttling device and directly using a liquid-measured control valve to throttle and control the flow, or replacing the pressure relief valve in the system with a corresponding solenoid valve, etc. The technical solutions after these changes or replacements will fall within the scope of protection of the present application.

Claims

1. An air conditioning system for blocking refrigerant leakage, characterized in that: include: a liquid side control valve, which is connected and arranged between the throttling device of the air conditioning system and the evaporator of the air conditioning system; an air-side control valve, which is connected between the compressor of the air-conditioning system and the evaporator of the air-conditioning system; a refrigerant concentration detector, which is disposed on the evaporator and is used to detect the refrigerant concentration in the space around the evaporator; and A controller selectively controls the working states of the liquid-side control valve and the gas-side control valve according to the detection value of the refrigerant concentration detector.

2. The air conditioning system according to claim 1, characterized in that: The control power supplies of the liquid-side control valve and the gas-side control valve are both provided with manual reset switches.

3. The air conditioning system according to claim 1, characterized in that: The air conditioning system further comprises: A pressure relief valve, one end of which is connected between the liquid side control valve and the condenser, and the other end of which is connected between the gas side control valve and the four-way valve of the air conditioning system.

4. A control method for blocking refrigerant leakage, the control method being applied to an air conditioning system, the air conditioning system comprising: a liquid side control valve, which is connected and arranged between the throttling device of the air conditioning system and the evaporator of the air conditioning system; an air-side control valve, which is connected between the compressor of the air-conditioning system and the evaporator of the air-conditioning system; A refrigerant concentration detector, which is arranged on the evaporator and is used to detect the refrigerant concentration in the space around the evaporator; The control method comprises: Acquiring the refrigerant concentration of the space around the evaporator by means of the refrigerant concentration detector; Determining whether the refrigerant concentration is greater than a preset concentration value; The working states of the liquid-side control valve and the gas-side control valve are selectively controlled according to the judgment result.

5. The control method according to claim 4, characterized in that: The step of "selectively controlling the working states of the liquid side control valve and the gas side control valve according to the judgment result" specifically includes: Confirming that the refrigerant concentration is greater than a preset concentration value; Acquiring an operating mode of the air conditioning system, and controlling the air conditioning system to operate in a cooling mode; Adjusting the working states of the liquid-side control valve and the gas-side control valve to recover the refrigerant in the air-conditioning system; and / or Confirming that the refrigerant concentration is less than or equal to a preset concentration value; The air conditioning system is controlled to operate normally in the current mode.

6. The control method according to claim 5, characterized in that: The step of "controlling the air conditioning system to operate in cooling mode" specifically includes: The air conditioning system is controlled to operate in a cooling mode for a first preset time period.

7. The control method according to claim 5, characterized in that: The step of "adjusting the working states of the liquid side control valve and the gas side control valve to recover the refrigerant in the air conditioning system" specifically includes: Controlling the liquid side control valve to close; When the detection value of the low-pressure pressure detector at the return air end of the compressor is less than a preset pressure value, the compressor and the air-side control valve are controlled to be closed.

8. The control method according to claim 5, characterized in that: The step of "adjusting the working states of the liquid side control valve and the gas side control valve to recover the refrigerant in the air conditioning system" specifically includes: Controlling the liquid side control valve to close; After the air conditioning system runs for a third preset time, the compressor and the air-side control valve are controlled to be closed.

9. The control method according to claim 8, characterized in that: The third preset time length is 30-90 seconds.

10. The control method according to any one of claims 5 to 9, characterized in that: After the step of "confirming that the refrigerant concentration is greater than a preset concentration value", the control method further includes: The electronic expansion valve is controlled to be adjusted to a maximum opening state and to operate for a second preset time period.

11. The control method according to claim 5, characterized in that: The gas-side control valve and the liquid-side control valve are electrically connected to a backup power supply, respectively. The control method further includes: When the air conditioning system is abnormally powered off, the backup power supply starts and controls the gas-side control valve and the liquid-side control valve to be closed respectively.

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