Control method and device of refrigerating system evaporator and refrigerating system

Abstract

The embodiment of the invention discloses a control method and device for an evaporator of a refrigerating system and the refrigerating system. The refrigerating system comprises a controller, a first refrigerating subsystem and a second refrigerating subsystem, the first refrigerating subsystem comprises a first compressor and a first evaporator, the second refrigerating subsystem comprises a second compressor and a second evaporator, and the controller is electrically connected with the compressors and the evaporators. The control method of the refrigerating system evaporator comprises the steps of receiving a control instruction; when the control instruction comprises a control instruction that the first refrigeration subsystem needs to refrigerate the second refrigeration subsystem and the first evaporator needs to work, at least one path of liquid inlet valve corresponding to the first evaporator is controlled to be switched on, and each path of liquid inlet valve corresponding to the second evaporator is controlled to be switched off; and when the conduction time of each liquid inlet valve corresponding to the first evaporator reaches the preset time, at least one liquid inlet valve corresponding to the second evaporator is controlled to be conducted. According to the technical scheme provided by the embodiment of the invention, normal work of the refrigerating system can be ensured.

Description

[0001] This application is a divisional application with application date of 2024.01.08, application number 2024100233289, and patent name “A control method for a refrigeration system evaporator and a refrigeration system”. Technical Field

[0002] The embodiments of the present invention relate to refrigeration control technology, and in particular to a control method and device for an evaporator of a refrigeration system, and a refrigeration system. Background Art

[0003] The refrigeration system is an important part of life and production as the temperature and humidity source for various products and equipment that require temperature and humidity regulation. The normal operation of the refrigeration system requires reliable control, and the evaporator of the refrigeration system also needs to be controlled.

[0004] At present, the existing control method of the evaporator of the refrigeration system is usually that when one refrigeration subsystem needs to work and the other refrigeration system is not working, if the absolute humidity of the air is relatively high and the evaporator temperature is much lower than the air dew point temperature, it will cause all the moisture in the air to condense into the evaporator of the refrigeration subsystem that needs to work, and the evaporator will have the problem of frosting, and even affect the normal operation of the refrigeration system. Summary of the invention

[0005] The embodiments of the present invention provide a control method and device for an evaporator of a refrigeration system and a refrigeration system to ensure the normal operation of the refrigeration system.

[0006] In a first aspect, an embodiment of the present invention provides a control method for an evaporator of a refrigeration system, wherein the refrigeration system comprises: a controller, a first refrigeration subsystem and a second refrigeration subsystem, wherein the first refrigeration subsystem comprises a first compressor and a first evaporator, and the second refrigeration subsystem comprises a second compressor and a second evaporator, wherein each of the evaporators corresponds to at least one liquid inlet valve, and the controller is electrically connected to each of the compressors and each of the liquid inlet valves, and is used to execute the control method, wherein the control method comprises:

[0007] Receive control instructions;

[0008] The control instruction includes an instruction for the second refrigeration subsystem to switch from a high-temperature and high-humidity working state to a cooling working state, and for the first refrigeration subsystem to perform refrigeration for the second refrigeration subsystem;

[0009] When the control instruction includes a control instruction requiring the first refrigeration subsystem to refrigerate the second refrigeration subsystem, and the first evaporator needs to work, controlling at least one liquid inlet valve corresponding to the first evaporator to be turned on, and controlling each liquid inlet valve corresponding to the second evaporator to be turned off;

[0010] When the conduction time of each liquid inlet valve corresponding to the first evaporator reaches a preset time, at least one liquid inlet valve corresponding to the second evaporator is controlled to be conducted.

[0011] Optionally, after receiving the control instruction, the step further includes:

[0012] According to the control instruction, the working state of the first compressor and the working state of the second compressor are controlled.

[0013] In a second aspect, an embodiment of the present invention provides a control device for an evaporator of a refrigeration system, wherein the refrigeration system comprises: a controller, a first refrigeration subsystem and a second refrigeration subsystem, wherein the first refrigeration subsystem comprises a first compressor and a first evaporator, and the second refrigeration subsystem comprises a second compressor and a second evaporator, wherein each of the evaporators corresponds to at least one liquid inlet valve, and the controller is electrically connected to each of the compressors and each of the liquid inlet valves, and is used to execute the control method, and the control device comprises:

[0014] Instruction receiving module, state determination module and state control module; wherein,

[0015] The instruction receiving module is used to receive control instructions;

[0016] The state determination module is used to determine the working state of each evaporator in the refrigeration system according to the control instruction;

[0017] The state control module is used to control the working state of the liquid inlet valve corresponding to each evaporator according to the control instruction and the working state of each evaporator.

[0018] Optionally, the state control module is specifically used to control at least one liquid inlet valve corresponding to the first evaporator to be turned on, and to control each liquid inlet valve corresponding to the second evaporator to be turned off when the control instruction includes a control instruction requiring the first refrigeration subsystem to cool the second refrigeration subsystem, and the first evaporator needs to work.

[0019] Optionally, the state control module is also used to control at least one liquid inlet valve corresponding to the second evaporator to be turned on after controlling the liquid inlet valves corresponding to the second evaporator to be turned off, when the time of the liquid inlet valves corresponding to the second evaporator being turned off reaches a preset time.

[0020] Optionally, the state control module is further used to control the working state of the first compressor and the working state of the second compressor according to the control instruction.

[0021] In a third aspect, an embodiment of the present invention provides a refrigeration system, comprising: a controller, a first refrigeration subsystem and a second refrigeration subsystem, the first refrigeration subsystem and the second refrigeration subsystem are connected via a heat exchanger, the first refrigeration subsystem comprises a first compressor and a first evaporator, the second refrigeration subsystem comprises a second compressor and a second evaporator, each of the evaporators corresponds to at least one liquid inlet valve, and the controller is electrically connected to each of the compressors and each of the liquid inlet valves.

[0022] Optionally, the first evaporator corresponds to one liquid inlet valve.

[0023] Optionally, the liquid inlet valve includes at least one of a solenoid valve and an expansion valve.

[0024] Optionally, the second evaporator corresponds to one liquid inlet valve.

[0025] The control method, device and refrigeration system of the evaporator of the refrigeration system provided by the embodiment of the present invention, the refrigeration system includes: a controller, a first refrigeration subsystem and a second refrigeration subsystem, the first refrigeration subsystem includes a first compressor and a first evaporator, the second refrigeration subsystem includes a second compressor and a second evaporator, each evaporator corresponds to at least one liquid inlet valve, the controller is electrically connected to each compressor and each liquid inlet valve, the controller is used to execute a control method, the control method includes: receiving a control instruction; determining the working state of each evaporator in the refrigeration system according to the control instruction; and controlling the working state of the liquid inlet valve corresponding to each evaporator according to the control instruction and the working state of each evaporator. The control method, device and refrigeration system of the evaporator of the refrigeration system of the environmental box provided by the embodiment of the present invention control the working state of the liquid inlet valve corresponding to each evaporator according to the control instruction and the working state of each evaporator, such as controlling the liquid inlet valves corresponding to the second evaporator to be closed, and when at least one liquid inlet valve corresponding to the first evaporator is turned on, the refrigerant is introduced into the first evaporator through the corresponding liquid inlet valve, the temperature of the first evaporator is relatively low, and the moisture in the air adheres to the first evaporator, and the first evaporator may be frosted or frozen, thereby reducing the air humidity, and preventing the moisture in the air from adhering to the second evaporator to cause the second evaporator to frost, thereby ensuring the normal operation of the second evaporator and the normal operation of the second refrigeration subsystem. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a flow chart of a control method for an evaporator of a refrigeration system provided in Embodiment 1 of the present invention;

[0027] Figure 2 is a flow chart of a control method for an evaporator of a refrigeration system provided in Embodiment 2 of the present invention;

[0028] Figure 3 is a structural block diagram of a control device for an evaporator of a refrigeration system provided by Embodiment 3 of the present invention;

[0029] Figure 4 It is a structural schematic diagram of a refrigeration system provided in Example 3 of the present invention. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] Embodiment 1

[0032] Figure 1 1 is a flow chart of a control method for an evaporator of a refrigeration system provided in Embodiment 1 of the present invention. This embodiment can be applied to control an evaporator in a refrigeration system, etc. The method can be executed by a controller in the refrigeration system, and the controller can be implemented in the form of software and / or hardware. The method specifically includes the following steps:

[0033] Step 110: Receive control instructions.

[0034] The control instruction may be an instruction for the first refrigeration subsystem to perform specific work and for the second refrigeration subsystem to perform specific work, such as an instruction for the second refrigeration subsystem to switch from a high temperature and high humidity working state to a cooling working state, and for the first refrigeration subsystem to perform refrigeration for the second refrigeration subsystem. The control instruction may be input from the outside into the controller of the refrigeration system.

[0035] Furthermore, the refrigeration system includes: a controller, a first refrigeration subsystem and a second refrigeration subsystem, the first refrigeration subsystem includes a first compressor and a first evaporator, the second refrigeration subsystem includes a second compressor and a second evaporator, each evaporator corresponds to at least one liquid inlet valve, and the controller is electrically connected to each compressor and each liquid inlet valve. The controller can control the working state of each compressor and the working state of each liquid inlet valve. If the control instruction includes an instruction that both the first refrigeration subsystem and the second refrigeration subsystem need to work, the controller can control both the first compressor and the second compressor to work.

[0036] Step 120: Determine the working state of each evaporator in the refrigeration system according to the control instruction.

[0037] Specifically, if the control instruction includes a control instruction requiring the first refrigeration subsystem to refrigerate the second refrigeration subsystem, it can be determined that both the first evaporator and the second evaporator need to work. If the control instruction includes an instruction for the first refrigeration subsystem to work, it can be determined that the first evaporator needs to work.

[0038] Step 130: Control the working state of the liquid inlet valve corresponding to each evaporator according to the control instruction and the working state of each evaporator.

[0039] Specifically, when the control instruction includes an instruction that the first refrigeration subsystem needs to refrigerate the second refrigeration subsystem, and the first evaporator needs to work, the controller controls at least one liquid inlet valve corresponding to the first evaporator to be turned on, and controls each liquid inlet valve corresponding to the second evaporator to be turned off. When the time for each liquid inlet valve corresponding to the first evaporator to be turned on reaches a preset time, the controller controls at least one liquid inlet valve corresponding to the second evaporator to be turned on. When each liquid inlet valve corresponding to the second evaporator is turned off and at least one liquid inlet valve corresponding to the first evaporator is turned on, the first evaporator is fed with refrigerant through the corresponding liquid inlet valve, the temperature of the first evaporator is relatively low, and moisture in the air adheres to the first evaporator, and the first evaporator may be frosted or frozen, thereby reducing the air humidity, preventing moisture in the air from adhering to the second evaporator to cause the second evaporator to frost, thereby ensuring the normal operation of the second evaporator and the normal operation of the refrigeration system.

[0040] It should be noted that the specific duration of the above preset time can be determined according to actual control requirements and is not limited here.

[0041] The control method of the evaporator of the refrigeration system provided in the present embodiment includes: receiving a control instruction; determining the working state of each evaporator in the refrigeration system according to the control instruction; and controlling the working state of the liquid inlet valve corresponding to each evaporator according to the control instruction and the working state of each evaporator. The control method of the evaporator of the refrigeration system provided in the present embodiment controls the working state of the liquid inlet valve corresponding to each evaporator according to the control instruction and the working state of each evaporator, such as controlling each liquid inlet valve corresponding to the second evaporator to be closed, and when at least one liquid inlet valve corresponding to the first evaporator is turned on, the first evaporator is fed with refrigerant by the corresponding liquid inlet valve, the temperature of the first evaporator is relatively low, and the moisture in the air adheres to the first evaporator, and the first evaporator may be frosted or frozen, thereby reducing the air humidity, and preventing the moisture in the air from adhering to the second evaporator to cause the second evaporator to frost, thereby ensuring the normal operation of the second evaporator and the normal operation of the second refrigeration subsystem.

[0042] Embodiment 2

[0043] Figure 2 1 is a flow chart of a control method for a refrigeration system evaporator provided in Embodiment 2 of the present invention. This embodiment can be applied to control the evaporator in the refrigeration system, etc. The method can be executed by a controller in the refrigeration system, and the controller can be implemented in the form of software and / or hardware. The method specifically includes the following steps:

[0044] Step 210: Receive control instructions.

[0045] The control instruction may be an instruction for the first refrigeration subsystem to perform specific work and for the second refrigeration subsystem to perform specific work, such as an instruction for the second refrigeration subsystem to switch from a high temperature and high humidity working state to a cooling working state, and for the first refrigeration subsystem to perform refrigeration for the second refrigeration subsystem. The control instruction may be input from the outside into the controller of the refrigeration system.

[0046] Furthermore, the refrigeration system includes: a controller, a first refrigeration subsystem and a second refrigeration subsystem, the first refrigeration subsystem includes a first compressor and a first evaporator, the second refrigeration subsystem includes a second compressor and a second evaporator, each evaporator corresponds to at least one liquid inlet valve, and the controller is electrically connected to each compressor and each liquid inlet valve. The controller can control the working state of each compressor and the working state of each liquid inlet valve. If the control instruction includes an instruction that both the first refrigeration subsystem and the second refrigeration subsystem need to work, the controller can control both the first compressor and the second compressor to work.

[0047] Step 220: When the control instruction includes a control instruction requiring the first refrigeration subsystem to refrigerate the second refrigeration subsystem, it is determined that both the first evaporator and the second evaporator need to operate.

[0048] Step 230: When the control instruction includes a control instruction requiring the first refrigeration subsystem to refrigerate the second refrigeration subsystem, and the first evaporator needs to work, at least one liquid inlet valve corresponding to the first evaporator is controlled to be turned on, and each liquid inlet valve corresponding to the second evaporator is controlled to be turned off.

[0049] When at least one inlet valve corresponding to the first evaporator is turned on, the first evaporator is frosted. Specifically, the controller controls at least one inlet valve corresponding to the first evaporator to be turned on, controls each inlet valve corresponding to the second evaporator to be turned off, and controls the first compressor to work. When each inlet valve corresponding to the second evaporator is turned off and at least one inlet valve corresponding to the first evaporator is turned on, the first evaporator is fed with refrigerant through the corresponding inlet valve, the temperature of the first evaporator is relatively low, and no refrigerant enters the second evaporator, which has a higher temperature than the first evaporator. Therefore, moisture in the air will adhere to the first evaporator with a lower temperature, and the first evaporator may be frosted or iced, thereby reducing the air humidity, and preventing moisture in the air from adhering to the second evaporator to cause the second evaporator to frost, so as to ensure the normal operation of the second evaporator.

[0050] Step 240: When the conduction time of each liquid inlet valve corresponding to the first evaporator reaches a preset time, control at least one liquid inlet valve corresponding to the second evaporator to be conducted.

[0051] Specifically, during the preset time when the various liquid inlet valves corresponding to the first evaporator are turned on, moisture in the air continuously adheres to the first evaporator. When the time when the various liquid inlet valves corresponding to the first evaporator are turned on reaches the preset time, the moisture in the air is basically attached to the first evaporator, and there is almost no moisture attached to the second evaporator. At this time, the controller can control at least one liquid inlet valve corresponding to the second evaporator to be turned on, and can control the second compressor to work, so as to perform refrigeration work through the second refrigeration subsystem.

[0052] It should be noted that the specific duration of the preset time in this embodiment can be determined according to actual control requirements and is not limited here.

[0053] The control method for the evaporator of the refrigeration system provided in the present embodiment controls the working state of the liquid inlet valve corresponding to each evaporator according to the control instruction and the working state of each evaporator, such as controlling the liquid inlet valves corresponding to the second evaporator to be closed, and when at least one liquid inlet valve corresponding to the first evaporator is turned on, the refrigerant is introduced into the first evaporator through the corresponding liquid inlet valve, the temperature of the first evaporator is relatively low, and the moisture in the air adheres to the first evaporator, and the first evaporator may be frosted or frozen, thereby reducing the air humidity, and preventing the moisture in the air from adhering to the second evaporator to cause the second evaporator to frost, thereby ensuring the normal operation of the second evaporator and the normal operation of the second refrigeration subsystem.

[0054] Embodiment 3

[0055] Figure 3 : is a structural block diagram of a control device for an evaporator of a refrigeration system provided by Embodiment 3 of the present invention. Figure 3 The control device for the evaporator of the refrigeration system includes: an instruction receiving module 310, a state determination module 320 and a state control module 330. The instruction receiving module 310 is used to receive the control instruction; the state determination module 320 is used to determine the working state of each evaporator in the refrigeration system according to the control instruction; the state control module 330 is used to control the working state of the liquid inlet valve corresponding to each evaporator according to the control instruction and the working state of each evaporator.

[0056] Based on the above implementation, the state determination module 320 is specifically used to determine that both the first evaporator and the second evaporator need to work when the control instruction includes a control instruction requiring the first refrigeration subsystem to refrigerate the second refrigeration subsystem.

[0057] In one embodiment, the state control module 330 is specifically used to control at least one liquid inlet valve corresponding to the first evaporator to be turned on, and control each liquid inlet valve corresponding to the second evaporator to be turned off when the control instruction includes a control instruction requiring the first refrigeration subsystem to cool the second refrigeration subsystem and the first evaporator needs to work.

[0058] Preferably, the state control module 330 is further used to control at least one liquid inlet valve corresponding to the second evaporator to be turned on after controlling the liquid inlet valves corresponding to the second evaporator to be turned off, when the time for which the liquid inlet valves corresponding to the first evaporator are turned on reaches a preset time.

[0059] Optionally, the state control module 330 is further configured to control the working state of the first compressor and the working state of the second compressor according to the control instruction.

[0060] Figure 4 Schematic diagram of a refrigeration system provided by Embodiment 3 of the present invention. Figure 4 , a refrigeration system, including a controller, a first refrigeration subsystem and a second refrigeration subsystem, the first refrigeration subsystem includes a first compressor CM1 and a first evaporator EVA1, the second refrigeration subsystem includes a second compressor CM2 and a second evaporator EVA2, each evaporator corresponds to at least one liquid inlet valve, a controller (not shown) is electrically connected to each compressor and each liquid inlet valve, and a control device as described in any embodiment of the present invention is integrated in the controller. Among them, the controller can control the working state of each compressor and the working state of each liquid inlet valve. The specific control process can refer to the above-mentioned embodiment 1 and embodiment 2, which will not be repeated here.

[0061] Optionally, the first evaporator EVA1 corresponds to one liquid inlet valve S1.

[0062] Specifically, when the first evaporator EVA1 needs to work, the controller controls the liquid inlet valve S1 corresponding to the first evaporator EVA1 to open, and the refrigerant in the pipeline where the liquid inlet valve S1 is located is transmitted to the first evaporator EVA1 through the liquid inlet valve, so that the first evaporator EVA1 performs heat exchange work on the refrigerant.

[0063] Optionally, the liquid inlet valve includes at least one of a solenoid valve and an expansion valve.

[0064] Exemplarily, the liquid inlet valve includes a solenoid valve and an expansion valve, and the controller can control the on-off of the solenoid valve and the opening of the expansion valve, thereby adjusting the flow entering the evaporator.

[0065] Optionally, the second evaporator EVA2 corresponds to one liquid inlet valve S2.

[0066] Specifically, when the second evaporator EVA2 needs to work, the controller controls the liquid inlet valve S2 corresponding to the second evaporator EVA2 to open, and the refrigerant in the pipeline where the liquid inlet valve S2 is located is transmitted to the second evaporator EVA2 through the liquid inlet valve, so that the second evaporator EVA2 performs heat exchange work on the refrigerant.

[0067] Furthermore, each of the above-mentioned refrigeration subsystems includes a condenser, the outlet of the compressor is connected to the inlet of the condenser through a pipeline, the outlet of the condenser is connected to the inlet of the evaporator through a pipeline, and the outlet of the evaporator is connected to the inlet of the compressor through a pipeline. When the refrigeration subsystem is performing refrigeration work, the compressor is started, and the compressor extracts the steam in the evaporator through compression, and increases the pressure and temperature of the refrigerant in the compressor through compression, compressing the low-temperature and low-pressure refrigerant in the compressor to a high-temperature and high-pressure state, and the high-temperature and high-pressure refrigerant is transmitted to the condenser through the outlet of the compressor. The condenser takes away the heat of the refrigerant in the high-temperature and high-pressure state, so that the high-temperature and high-pressure refrigerant is cooled, and the cooled refrigerant is transmitted to the evaporator through the outlet of the condenser and the liquid inlet valve. The low-temperature and low-pressure refrigerant entering the evaporator evaporates in the evaporator and absorbs heat to achieve the purpose of refrigeration. The specific working principle can refer to the working principle of the existing refrigeration system, which will not be repeated here.

[0068] It should be noted that Figure 4 The first evaporator EVA1 corresponds to the three-way liquid inlet valve S1, and the second evaporator EVA2 corresponds to the three-way liquid inlet valve S2. This is only a schematic illustration and can be determined according to actual control requirements and is not limited here.

[0069] The control device and refrigeration system of the refrigeration system evaporator provided in this embodiment and the control method of the refrigeration system evaporator provided in any embodiment of the present invention belong to the same inventive concept and have corresponding beneficial effects. For technical details not detailed in this embodiment, please refer to the control method of the refrigeration system evaporator provided in any embodiment of the present invention.

[0070] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A control method for an evaporator of a refrigeration system, characterized in that: The refrigeration system comprises: a controller, a first refrigeration subsystem and a second refrigeration subsystem, the first refrigeration subsystem comprises a first compressor and a first evaporator, the second refrigeration subsystem comprises a second compressor and a second evaporator, each of the evaporators corresponds to at least one liquid inlet valve, the controller is electrically connected to each of the compressors and each of the liquid inlet valves, and the controller is used to execute the control method, and the control method comprises: Receive control instructions; The control instruction includes an instruction for the second refrigeration subsystem to switch from a high-temperature and high-humidity working state to a temperature-lowering working state, and for the first refrigeration subsystem to perform refrigeration for the second refrigeration subsystem; When the control instruction includes a control instruction requiring the first refrigeration subsystem to refrigerate the second refrigeration subsystem, and the first evaporator needs to work, controlling at least one liquid inlet valve corresponding to the first evaporator to be turned on, and controlling each liquid inlet valve corresponding to the second evaporator to be turned off; When the conduction time of each liquid inlet valve corresponding to the first evaporator reaches a preset time, at least one liquid inlet valve corresponding to the second evaporator is controlled to be conducted.

2. The control method according to claim 1, characterized in that: After receiving the control instruction, the method further comprises: According to the control instruction, the working state of the first compressor and the working state of the second compressor are controlled.

3. A control device for an evaporator of a refrigeration system, characterized in that: The refrigeration system comprises: a controller, a first refrigeration subsystem and a second refrigeration subsystem, the first refrigeration subsystem comprises a first compressor and a first evaporator, the second refrigeration subsystem comprises a second compressor and a second evaporator, each of the evaporators corresponds to at least one liquid inlet valve, the controller is electrically connected to each of the compressors and each of the liquid inlet valves, the controller is used to execute the control method, and the control device comprises: Instruction receiving module, state determination module and state control module; wherein, The instruction receiving module is used to receive control instructions; The state determination module is used to determine the working state of each evaporator in the refrigeration system according to the control instruction; The state control module is used to control the working state of the liquid inlet valve corresponding to each evaporator according to the control instruction and the working state of each evaporator.

4. The control device for the evaporator of the refrigeration system according to claim 3, characterized in that: The state control module is specifically used to control at least one liquid inlet valve corresponding to the first evaporator to be turned on, and to control each liquid inlet valve corresponding to the second evaporator to be turned off when the control instruction includes a control instruction requiring the first refrigeration subsystem to cool the second refrigeration subsystem and the first evaporator needs to work.

5. The control device for the evaporator of the refrigeration system according to claim 4, characterized in that: The state control module is also used to control at least one liquid inlet valve corresponding to the second evaporator to be turned on after controlling the liquid inlet valves corresponding to the second evaporator to be turned off, when the time of the liquid inlet valves corresponding to the second evaporator being turned off reaches a preset time.

6. The control device for the evaporator of the refrigeration system according to claim 3, characterized in that: The state control module is further used to control the working state of the first compressor and the working state of the second compressor according to the control instruction.

7. A refrigeration system, characterized in that: include: A controller, a first refrigeration subsystem and a second refrigeration subsystem, wherein the first refrigeration subsystem and the second refrigeration subsystem are connected via a heat exchanger, the first refrigeration subsystem comprises a first compressor and a first evaporator, the second refrigeration subsystem comprises a second compressor and a second evaporator, each of the evaporators corresponds to at least one liquid inlet valve, and the controller is electrically connected to each of the compressors and each of the liquid inlet valves.

8. The refrigeration system according to claim 7, characterized in that: The first evaporator corresponds to a liquid inlet valve.

9. The refrigeration system according to claim 7, characterized in that: The liquid inlet valve includes at least one of a solenoid valve and an expansion valve.

10. The refrigeration system according to claim 7, characterized in that: The second evaporator corresponds to one liquid inlet valve.

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