Liquid cooling system and control method

Abstract

The application relates to the air conditioning technical field, in particular to a liquid cooling system and a control method. The liquid cooling system comprises a compressor, a four-way valve, a plate heat exchanger, a driving plate, a fin heat exchanger, a first electronic expansion valve, a second electronic expansion valve and a first temperature sensor. The compressor is communicated with the plate heat exchanger through the four-way valve, one end of the driving plate is communicated with the plate heat exchanger, the other end of the driving plate is communicated with the fin heat exchanger, and the fin heat exchanger is communicated with the compressor through the four-way valve. The first electronic expansion valve is arranged between the driving plate and the plate heat exchanger, the second electronic expansion valve is arranged between the driving plate and the fin heat exchanger, and the first temperature sensor is arranged between the second electronic expansion valve and the driving plate. The first temperature sensor is used for detecting the temperature of the refrigerant between the second electronic expansion valve and the driving plate. The liquid cooling system can improve the heat dissipation efficiency of the driving plate, improve the operation capacity of the unit, and save the cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning, in particular to a liquid cooling system and a control method. BACKGROUND

[0002] At present, the heat management module in the air conditioner is usually provided with a drive plate for controlling the start and stop of the equipment and adjusting the running state of the equipment. In the prior art, the drive plate is usually cooled by air cooling. When the air conditioner runs in the cooling mode in summer, the outdoor unit needs to release heat as a condenser, so that the heat generated by the outdoor unit reduces the cooling effect of the drive plate, thereby reducing the heat dissipation efficiency of the drive plate and affecting the use performance of the unit and increasing the cost.

[0003] Therefore, it is urgent to design a liquid cooling system and a control method to solve the above technical problems. SUMMARY

[0004] The first purpose of the present application is to provide a liquid cooling system which can improve the heat dissipation efficiency of the drive plate, improve the running capacity of the unit and save cost.

[0005] To achieve this purpose, the present application adopts the following technical solutions:

[0006] The present application provides a liquid cooling system, comprising a compressor, a four-way valve, a plate heat exchanger, a drive plate and a fin heat exchanger; the compressor is communicated with the plate heat exchanger through the four-way valve, one end of the drive plate is communicated with the plate heat exchanger, the other end is communicated with the fin heat exchanger, and the fin heat exchanger is communicated with the compressor through the four-way valve;

[0007] A first electronic expansion valve is arranged between the drive plate and the plate heat exchanger;

[0008] A second electronic expansion valve is arranged between the drive plate and the fin heat exchanger;

[0009] A first temperature sensor is arranged between the second electronic expansion valve and the drive plate, and the first temperature sensor is used for detecting the temperature of the refrigerant between the second electronic expansion valve and the drive plate.

[0010] As an optional technical solution of the liquid cooling system, the liquid cooling system has a heating mode, the four-way valve has a port a, a port b, a port c and a port d, the port a is communicated with the exhaust port of the compressor, and the port a is communicated with the plate heat exchanger through the port d, the port b is communicated with the fin heat exchanger, and the port b is communicated with the suction port of the compressor through the port c.

[0011] As an optional technical scheme of the liquid cooling system, the liquid cooling system further comprises a suction temperature sensor and a second temperature sensor, the suction temperature sensor is arranged between the suction port of the compressor and the four-way valve, and the suction temperature sensor is used for detecting the refrigerant temperature entering the suction port of the compressor.

[0012] The second temperature sensor is arranged on the fin heat exchanger, and the second temperature sensor is used for detecting the coil temperature in the fin heat exchanger.

[0013] The suction superheat degree of the compressor is equal to the difference between the refrigerant temperature of the suction port of the compressor and the coil temperature in the fin heat exchanger.

[0014] As an optional technical scheme of the liquid cooling system, the liquid cooling system has a refrigeration mode, the four-way valve has a port a, a port b, a port c and a port d, the port a is communicated with the exhaust port of the compressor, the port a is communicated with the port b, the port b is communicated with the fin heat exchanger, and the port d is communicated with the suction port of the compressor through the port c.

[0015] As an optional technical scheme of the liquid cooling system, the liquid cooling system further comprises a suction temperature sensor and a third temperature sensor, the suction temperature sensor is arranged between the suction port of the compressor and the four-way valve, and the suction temperature sensor is used for detecting the refrigerant temperature entering the suction port of the compressor.

[0016] The third temperature sensor is arranged between the first electronic expansion valve and the plate heat exchanger, and the third temperature sensor is used for detecting the temperature of the refrigerant between the first electronic expansion valve and the plate heat exchanger.

[0017] The suction superheat degree of the compressor is equal to the difference between the refrigerant temperature of the suction port of the compressor and the temperature of the refrigerant between the first electronic expansion valve and the plate heat exchanger.

[0018] As an optional technical scheme of the liquid cooling system, the liquid cooling system further comprises a controller, the controller is electrically connected with the first electronic expansion valve, the second electronic expansion valve and the first temperature sensor.

[0019] As an optional technical scheme of the liquid cooling system, the liquid cooling system further comprises an air conditioner water inlet pipe and an air conditioner water outlet pipe, and the air conditioner water inlet pipe and the air conditioner water outlet pipe are communicated with the plate heat exchanger.

[0020] The second object of the application is to provide a control method of a liquid cooling system, which has simple steps, can improve the heat dissipation efficiency of the driving board in the heating mode and the refrigeration mode, improve the operation capacity of the unit, and achieve the purpose of saving cost.

[0021] To achieve the above object, the present application adopts the following technical solutions:

[0022] The present application provides a control method of a liquid cooling system, which is applied to the liquid cooling system described in any of the optional technical solutions above, and comprises the following steps:

[0023] When the unit is running in the heating mode, the opening degree of the first electronic expansion valve is opened to the maximum, and the unit is allowed to run for a preset time;

[0024] The temperature of the first temperature sensor is obtained; when the temperature of the first temperature sensor is greater than a first preset temperature, the first electronic expansion valve is closed by 5% of the current opening degree every 15 seconds until the temperature of the first temperature sensor is less than a second preset temperature, and the first electronic expansion valve is kept at the current opening degree;

[0025] Or,

[0026] When the unit is running in the cooling mode, the opening degree of the second electronic expansion valve is opened to the maximum, and the unit is allowed to run for a preset time;

[0027] The temperature of the first temperature sensor is obtained; when the temperature of the first temperature sensor is greater than a first preset temperature, the second electronic expansion valve is closed by 5% of the current opening degree every 15 seconds until the temperature of the first temperature sensor is less than a second preset temperature, and the second electronic expansion valve is kept at the current opening degree.

[0028] As an optional technical solution of the control method of the liquid cooling system, the maximum opening degree of the first electronic expansion valve and the maximum opening degree of the second electronic expansion valve are the same, and the maximum opening degree of the first electronic expansion valve and the maximum opening degree of the second electronic expansion valve are both 480P.

[0029] As an optional technical solution of the control method of the liquid cooling system, the preset time is set to 30-120 seconds; the first preset temperature is set to 55℃, and the second preset temperature is set to 50℃.

[0030] The present application has at least the following beneficial effects:

[0031] The application provides a liquid cooling system, which comprises a compressor, a four-way valve, a plate heat exchanger, a driving plate, a fin heat exchanger, a first electronic expansion valve, a second electronic expansion valve and a first temperature sensor. The compressor is communicated with the plate heat exchanger through the four-way valve, one end of the driving plate is communicated with the plate heat exchanger, the other end of the driving plate is communicated with the fin heat exchanger, and the fin heat exchanger is communicated with the compressor through the four-way valve. The first electronic expansion valve is arranged between the driving plate and the plate heat exchanger, the second electronic expansion valve is arranged between the driving plate and the fin heat exchanger, and the first temperature sensor is arranged between the second electronic expansion valve and the driving plate, and the first temperature sensor is used for detecting the temperature of the refrigerant between the second electronic expansion valve and the driving plate.

[0032] When the liquid cooling system runs in a heating mode, the first electronic expansion valve can dynamically adjust the opening degree of the first electronic expansion valve according to the temperature value of the first temperature sensor, so that the refrigerant flowing through the first electronic expansion valve can be throttled and decompressed from a high-temperature and high-pressure liquid state to a low-temperature and low-pressure gas-liquid mixed state, thereby reducing the temperature and pressure of the refrigerant, so that the refrigerant flowing through the driving plate subsequently can effectively take away the heat of the driving plate, and the heat dissipation efficiency of the driving plate is improved. In other words, by throttling and decompressing the refrigerant through the first electronic expansion valve, the temperature difference between the refrigerant and the driving plate can be formed, and the heat of the driving plate can be taken away, thereby realizing the liquid cooling heat dissipation effect of the driving plate. At the same time, through the temperature feedback of the refrigerant flowing out of the driving plate by the first temperature sensor, the first electronic expansion valve can realize the function of dynamically adjusting the opening degree, that is, the temperature of the refrigerant flowing into the driving plate can be dynamically adjusted, thereby ensuring the heat dissipation effect of the driving plate, improving the unit operation capacity, and saving the cost.

[0033] When the liquid cooling system runs in a heating mode, the first electronic expansion valve can dynamically adjust the opening degree of the first electronic expansion valve according to the temperature value of the first temperature sensor, so that the refrigerant flowing through the first electronic expansion valve can be throttled and decompressed from a high-temperature and high-pressure liquid state to a low-temperature and low-pressure gas-liquid mixed state, thereby reducing the temperature and pressure of the refrigerant, so that the refrigerant flowing through the driving plate subsequently can effectively take away the heat of the driving plate, and the heat dissipation efficiency of the driving plate is improved. In other words, by throttling and decompressing the refrigerant through the first electronic expansion valve, the temperature difference between the refrigerant and the driving plate can be formed, and the heat of the driving plate can be taken away, thereby realizing the liquid cooling heat dissipation effect of the driving plate. At the same time, through the temperature feedback of the refrigerant flowing out of the driving plate by the first temperature sensor, the first electronic expansion valve can realize the function of dynamically adjusting the opening degree, that is, the temperature of the refrigerant flowing into the driving plate can be dynamically adjusted, thereby ensuring the heat dissipation effect of the driving plate, improving the unit operation capacity, and saving the cost.

[0034] The application further provides a control method of the liquid cooling system, which is simple in steps, can improve the heat dissipation efficiency of the driving plate in the heating mode and the cooling mode, improve the operation capacity of the unit, and save cost. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description only represent some embodiments of the present application, and all other drawings obtained by those skilled in the art based on the contents of the embodiments of the present application without creative effort are within the protection scope of the present application.

[0036] Figure 1 is a schematic diagram of the liquid cooling system in the heating mode provided by the embodiments of the present application;

[0037] Figure 2 is a schematic diagram of the liquid cooling system in the cooling mode provided by the embodiments of the present application.

[0038] Reference signs

[0039] 10, compressor; 20, four-way valve; 30, plate heat exchanger; 31, air conditioner water inlet pipe; 32, air conditioner water outlet pipe; 40, driving plate; 50, fin heat exchanger; 60, first electronic expansion valve; 70, second electronic expansion valve; 80, first temperature sensor; 90, second temperature sensor; 100, third temperature sensor; 110, suction temperature sensor. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative effort are within the protection scope of the present application.

[0042] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0043] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the product of the present application is usually placed, and are merely for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0044] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "provided", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In the present application, unless otherwise specified and limited, "on" or "under" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "above" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. "Below", "below" and "below" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0046] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application.

[0047] The present embodiment provides a liquid cooling system which can improve the heat dissipation efficiency of the drive board, improve the operation capacity of the unit, and save costs.

[0048] As Figures 1-2As shown, the liquid cooling system mainly includes a compressor 10, a four-way valve 20, a plate heat exchanger 30, a drive plate 40, a fin heat exchanger 50, a first electronic expansion valve 60, a second electronic expansion valve 70, and a first temperature sensor 80. The compressor 10 is in communication with the plate heat exchanger 30 through the four-way valve 20, one end of the drive plate 40 is in communication with the plate heat exchanger 30, and the other end is in communication with the fin heat exchanger 50, and the fin heat exchanger 50 is in communication with the compressor 10 through the four-way valve 20.

[0049] The first electronic expansion valve 60 is arranged between the drive plate 40 and the plate heat exchanger 30, the second electronic expansion valve 70 is arranged between the drive plate 40 and the fin heat exchanger 50, and the first temperature sensor 80 is arranged between the second electronic expansion valve 70 and the drive plate 40. The first temperature sensor 80 is used to detect the temperature of the refrigerant between the second electronic expansion valve 70 and the drive plate 40.

[0050] Based on the above design, in this embodiment, when the liquid cooling system operates in a heating mode, the first electronic expansion valve 60 can dynamically adjust the opening degree of the first electronic expansion valve 60 according to the temperature value of the first temperature sensor 80, so that the refrigerant flowing through the first electronic expansion valve 60 can be throttled and decompressed from a high-temperature and high-pressure liquid state to a low-temperature and low-pressure gas-liquid mixed state, thereby reducing the temperature and pressure of the refrigerant, so that the subsequent refrigerant flowing through the drive plate 40 can effectively take away the heat of the drive plate 40, improving the heat dissipation efficiency of the drive plate 40. In other words, by throttling and decompressing the refrigerant through the first electronic expansion valve 60, the temperature difference between the refrigerant and the temperature of the drive plate 40 can be formed, thereby taking away the heat of the drive plate 40, and realizing the liquid cooling heat dissipation effect of the drive plate 40.

[0051] At the same time, through the temperature feedback of the refrigerant flowing out of the drive plate 40 by the first temperature sensor 80, the first electronic expansion valve 60 can realize the function of dynamically adjusting the opening degree, that is, the temperature of the refrigerant flowing into the drive plate 40 can be dynamically adjusted, thereby ensuring the heat dissipation effect of the drive plate 40, improving the operating capacity of the unit, and saving costs.

[0052] When the liquid cooling system operates in a cooling mode, the second electronic expansion valve 70 can dynamically adjust the opening degree of the second electronic expansion valve 70 according to the temperature value of the first temperature sensor 80, so that the refrigerant flowing through the second electronic expansion valve 70 can be throttled and decompressed from a high-temperature and high-pressure liquid state to a low-temperature and low-pressure gas-liquid mixed state, thereby reducing the temperature and pressure of the refrigerant, so that the subsequent refrigerant flowing through the drive plate 40 can effectively take away the heat of the drive plate 40, improving the heat dissipation efficiency of the drive plate 40. In other words, by throttling and decompressing the refrigerant through the second electronic expansion valve 70, the temperature difference between the refrigerant and the temperature of the drive plate 40 can be formed, thereby taking away the heat of the drive plate 40, and realizing the liquid cooling heat dissipation effect of the drive plate 40.

[0053] Meanwhile, through the feedback of the temperature of the refrigerant flowing into the drive board 40 (i.e. the temperature of the refrigerant after the pressure reduction of the second electronic expansion valve 70) by the first temperature sensor 80, the second electronic expansion valve 70 can realize the function of dynamically adjusting the opening degree, i.e. can dynamically adjust the temperature of the refrigerant flowing into the drive board 40, so as to ensure the heat dissipation effect of the drive board 40, improve the operation capacity of the unit, and save the cost.

[0054] When the liquid cooling system is in the heating mode, the first temperature sensor 80 detects the temperature of the refrigerant flowing out of the drive board 40, and the first electronic expansion valve 60 dynamically adjusts the opening degree according to the temperature of the first temperature sensor 80, so as to dynamically adjust the temperature of the refrigerant flowing into the drive board 40 and improve the heat dissipation effect of the drive board 40; when the liquid cooling system is in the cooling mode, the first temperature sensor 80 detects the temperature of the refrigerant flowing into the drive board 40, and at this time, the second electronic expansion valve 70 dynamically adjusts the opening degree according to the temperature of the first temperature sensor 80, so as to dynamically adjust the temperature of the refrigerant flowing into the drive board 40 and improve the heat dissipation effect of the drive board 40. In this way, the liquid cooling system can ensure the liquid cooling heat dissipation effect of the drive board 40 in both the heating mode and the cooling mode, improve the flexible applicability, improve the operation capacity of the unit, and save the cost.

[0055] The liquid cooling system in the embodiment further comprises a controller, which is electrically connected with the first electronic expansion valve 60, the second electronic expansion valve 70 and the first temperature sensor 80. Through the setting of the controller, the first temperature sensor 80 can feed back the detected temperature of the refrigerant to the controller in real time, and then the controller dynamically adjusts the opening degree of the first electronic expansion valve 60 and the second electronic expansion valve 70 according to the temperature data, so as to throttle and reduce the pressure of the refrigerant and ensure the liquid cooling heat dissipation effect of the drive board 40 and improve the heat dissipation efficiency.

[0056] Optionally, the controller in the embodiment can be a PLC controller commonly seen on the market, and therefore, the structure and working principle thereof will not be described in detail here.

[0057] As shown in Figure 1 In the embodiment, the four-way valve 20 has an a port, a b port, a c port and a d port, the a port is communicated with the exhaust port of the compressor 10, and the a port is communicated with the plate heat exchanger 30 through the d port, the b port is communicated with the fin heat exchanger 50, and the b port is communicated with the suction port of the compressor 10 through the c port. When the liquid cooling system is in the heating mode, the flow direction of the refrigerant in the liquid cooling system is shown by the arrow direction in Figure 1 .

[0058] Further, the liquid cooling system in the embodiment further comprises a suction temperature sensor 110 and a second temperature sensor 90. The suction temperature sensor 110 is arranged between the suction port of the compressor 10 and the four-way valve 20, and is configured to detect the temperature of the refrigerant entering the suction port of the compressor 10. The second temperature sensor 90 is arranged on the finned heat exchanger 50, and is configured to detect the temperature of the coil in the finned heat exchanger 50. In this way, the refrigerant supply amount of the finned heat exchanger 50 can be controlled according to the suction superheat of the compressor 10 = the temperature of the refrigerant at the suction port of the compressor 10 - the temperature of the coil in the finned heat exchanger 50, so as to ensure that the refrigerant supply amount of the finned heat exchanger 50 meets the requirements.

[0059] Further, in the heating mode, the second electronic expansion valve 70 is controlled so that the second electronic expansion valve 70 can dynamically adjust the opening degree of the second electronic expansion valve 70 according to the suction superheat of the compressor 10, so as to ensure that the refrigerant supply amount of the finned heat exchanger 50 meets the requirements, thereby ensuring stable operation of the unit.

[0060] As shown in Figure 2 In the embodiment, the four-way valve 20 has an a port, a b port, a c port and a d port. The a port is in communication with the discharge port of the compressor 10. The a port is in communication with the b port. The b port is in communication with the finned heat exchanger 50. The d port is in communication with the suction port of the compressor 10 through the c port. When the liquid cooling system is in the cooling mode, the flow direction of the refrigerant in the liquid cooling system is shown by the arrow direction in Figure 2 .

[0061] Further, the liquid cooling system in the embodiment further comprises a suction temperature sensor 110 and a third temperature sensor 100. The suction temperature sensor 110 is arranged between the suction port of the compressor 10 and the four-way valve 20, and is configured to detect the temperature of the refrigerant entering the suction port of the compressor 10. The third temperature sensor 100 is arranged between the first electronic expansion valve 60 and the plate heat exchanger 30, and is configured to detect the temperature of the refrigerant between the first electronic expansion valve 60 and the plate heat exchanger 30. In this way, the refrigerant supply amount of the plate heat exchanger 30 can be controlled according to the suction superheat of the compressor 10 = the temperature of the refrigerant at the suction port of the compressor 10 - the temperature of the refrigerant between the first electronic expansion valve 60 and the plate heat exchanger 30, so as to ensure that the refrigerant supply amount of the plate heat exchanger 30 meets the requirements.

[0062] Optionally, the third temperature sensor 100 in the embodiment can also be arranged on the plate heat exchanger 30, and is configured to detect the temperature of the refrigerant flowing into the coil of the plate heat exchanger 30, so as to improve the integration and compactness of the structure of the liquid cooling system, and save installation space.

[0063] Furthermore, in the cooling mode, it controls the first electronic expansion valve 60 so that the first electronic expansion valve 60 can dynamically adjust its own opening according to the suction superheat of the compressor 10, thereby ensuring that the refrigerant supply volume of the plate heat exchanger 30 meets the requirements to ensure stable operation of the unit.

[0064] like Figures 1-2 As shown, in this embodiment, the liquid cooling system further includes an air conditioning water inlet pipe 31 and an air conditioning water outlet pipe 32, both of which are connected to the plate heat exchanger 30. The arrangement of the air conditioning water inlet pipe 31 and the air conditioning water outlet pipe 32 ensures that the plate heat exchanger 30 has sufficient cooling water for heat exchange, thereby ensuring stable operation of the unit.

[0065] This embodiment further provides a control method for a liquid cooling system, which is applied to the above-mentioned liquid cooling system. The control method for the liquid cooling system includes:

[0066] When the unit operates in heating mode, the opening of the first electronic expansion valve 60 is opened to the maximum, and the unit operates for a preset time.

[0067] Specifically, at this time, the opening of the first electronic expansion valve 60 is opened to 480P, and the preset time of the unit operation can be set to 30 seconds to 120 seconds. This can make the refrigerant in the unit flow stably, which is beneficial to improve the accuracy of the refrigerant temperature detected by the subsequent first temperature sensor 80, ensure the stability of the unit operation, and improve the operating capacity.

[0068] Obtain the temperature of the first temperature sensor 80; when the temperature of the first temperature sensor 80 is greater than the first preset temperature, the first electronic expansion valve 60 closes 5% of the current opening every 15 seconds, thereby gradually improving the throttling and pressure reduction effect on the refrigerant, and reducing the temperature and pressure of the refrigerant until the refrigerant temperature detected by the first temperature sensor 80 is less than the second preset temperature. At this time, the opening of the first electronic expansion valve 60 is controlled to maintain the current opening unchanged, thereby improving the liquid cooling and heat dissipation effect of the refrigerant on the drive plate 40.

[0069] Optionally, in this embodiment, the first preset temperature can be set to 55°C, and the second preset temperature can be set to 50°C.

[0070] When the unit operates in cooling mode, the second electronic expansion valve 70 is opened to the maximum, and the unit operates for a preset time.

[0071] Specifically, at this time, the opening of the second electronic expansion valve 70 is opened to 480P, and the preset time of the unit operation can be set to 30 seconds to 120 seconds. This can make the refrigerant in the unit flow stably, which is beneficial to improve the accuracy of the refrigerant temperature detected by the subsequent first temperature sensor 80, ensure the stability of the unit operation, and improve the operating capacity.

[0072] The temperature of the first temperature sensor 80 is acquired; when the temperature of the first temperature sensor 80 is greater than a first preset temperature, the second electronic expansion valve 70 is closed by 5% of the current opening degree every 15 seconds, so as to gradually increase the throttling pressure reduction effect on the refrigerant, reduce the temperature and pressure of the refrigerant, until the refrigerant temperature detected by the first temperature sensor 80 is less than a second preset temperature, at this time, the opening degree of the second electronic expansion valve 70 is controlled to remain unchanged at the current opening degree, so as to improve the liquid cooling heat dissipation effect of the refrigerant on the drive board 40.

[0073] Optionally, the first preset temperature in the embodiment can be set to 55℃, and the second preset temperature can be set to 50℃.

[0074] The control method of the liquid cooling system in the embodiment is simple in steps, and can improve the heat dissipation efficiency on the drive board 40 in the heating mode and the cooling mode, improve the operation capacity of the unit, and achieve the purpose of saving cost.

[0075] Obviously, the above only describes the preferred embodiments of the present application and the technical principles applied. It is understood by those skilled in the art that the present application is not limited to the specific embodiments herein, and those skilled in the art can make various obvious changes, readjustments and substitutions without departing from the protection scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the appended claims.

[0076] Note that in the description of the present specification, the description referring to the terms "some embodiments", "other embodiments", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. The illustrative expressions of the above terms in the present specification do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A liquid cooling system, characterized by, The liquid cooling system comprises a compressor (10), a four-way valve (20), a plate heat exchanger (30), a driving plate (40), a fin heat exchanger (50), a first electronic expansion valve (60), a second electronic expansion valve (70) and a first temperature sensor (80); the compressor (10) is communicated with the plate heat exchanger (30) through the four-way valve (20), one end of the driving plate (40) is communicated with the plate heat exchanger (30), and the other end is communicated with the fin heat exchanger (50); the fin heat exchanger (50) is communicated with the compressor (10) through the four-way valve (20); The first electronic expansion valve (60) is arranged between the driving plate (40) and the plate heat exchanger (30); The second electronic expansion valve (70) is arranged between the driving plate (40) and the fin heat exchanger (50); The first temperature sensor (80) is arranged between the second electronic expansion valve (70) and the driving plate (40), and is used for detecting the temperature of the refrigerant between the second electronic expansion valve (70) and the driving plate (40); The liquid cooling system has a heating mode and a cooling mode, the four-way valve (20) has a port a, a port b, a port c and a port d, when the liquid cooling system is in the heating mode, the port a is communicated with the exhaust port of the compressor (10), the port a is communicated with the plate heat exchanger (30) through the port d, the port b is communicated with the fin heat exchanger (50), and the port b is communicated with the suction port of the compressor (10) through the port c; when the liquid cooling system is in the cooling mode, the port a is communicated with the exhaust port of the compressor (10), the port a is communicated with the port b, the port b is communicated with the fin heat exchanger (50), and the port d is communicated with the suction port of the compressor (10) through the port c.

2. The liquid cooling system of claim 1, wherein, The liquid cooling system further comprises a suction temperature sensor (110) and a second temperature sensor (90), the suction temperature sensor (110) is arranged between the suction port of the compressor (10) and the four-way valve (20), and is used for detecting the temperature of the refrigerant entering the suction port of the compressor (10); The second temperature sensor (90) is arranged on the fin heat exchanger (50), and is used for detecting the temperature of the coil in the fin heat exchanger (50); The suction superheat degree of the compressor (10) is equal to the difference between the temperature of the refrigerant at the suction port of the compressor (10) and the temperature of the coil in the fin heat exchanger (50).

3. The liquid cooling system of claim 1, wherein, The liquid cooling system further comprises a suction temperature sensor (110) and a third temperature sensor (100), the suction temperature sensor (110) is arranged between the suction port of the compressor (10) and the four-way valve (20), and is used for detecting the temperature of the refrigerant entering the suction port of the compressor (10); The third temperature sensor (100) is arranged between the first electronic expansion valve (60) and the plate heat exchanger (30), and is used to detect the temperature of the refrigerant between the first electronic expansion valve (60) and the plate heat exchanger (30). The suction superheat degree of the compressor (10) is equal to the difference between the refrigerant temperature of the suction port of the compressor (10) and the temperature of the refrigerant between the first electronic expansion valve (60) and the plate heat exchanger (30).

4. The liquid cooling system of any of claims 1-3, wherein, The liquid cooling system further comprises a controller, which is electrically connected with the first electronic expansion valve (60), the second electronic expansion valve (70) and the first temperature sensor (80).

5. The liquid cooling system of any of claims 1-3, wherein, The liquid cooling system further comprises an air conditioner water inlet pipe (31) and an air conditioner water outlet pipe (32), which are both in communication with the plate heat exchanger (30).

6. A control method of a liquid cooling system, characterized by, The control method of the liquid cooling system is applied to the liquid cooling system of any one of claims 1-5, and comprises the following steps: When the unit operates in a heating mode, the opening degree of the first electronic expansion valve (60) is opened to the maximum, and the unit is operated for a preset time; obtaining the temperature of the first temperature sensor (80); when the temperature of the first temperature sensor (80) is greater than a first preset temperature, the first electronic expansion valve (60) is closed by 5% of the current opening degree every 15 seconds until the temperature of the first temperature sensor (80) is less than a second preset temperature, and the first electronic expansion valve (60) is kept at the current opening degree; Or, When the unit operates in a cooling mode, the opening degree of the second electronic expansion valve (70) is opened to the maximum, and the unit is operated for a preset time; obtaining the temperature of the first temperature sensor (80); when the temperature of the first temperature sensor (80) is greater than a first preset temperature, the second electronic expansion valve (70) is closed by 5% of the current opening degree every 15 seconds until the temperature of the first temperature sensor (80) is less than a second preset temperature, and the second electronic expansion valve (70) is kept at the current opening degree.

7. The control method of the liquid cooling system according to claim 6, wherein The maximum opening degree of the first electronic expansion valve (60) and the maximum opening degree of the second electronic expansion valve (70) are the same, and both are 480P.

8. The control method of the liquid cooling system according to claim 6, wherein The preset time is set to 30-120 seconds, the first preset temperature is set to 55℃, and the second preset temperature is set to 50℃.

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