A temperature control system for an immersion liquid cooling device

Abstract

The present application relates to a temperature control system for an immersion liquid cooling device. The temperature control system includes an immersion liquid cooling device and a temperature control device. The immersion liquid cooling device is filled with immersion liquid. The immersion liquid flows to the temperature control device through an inlet pipe and flows back to the immersion liquid cooling device through a return pipe. The temperature control device includes: a temperature detection unit, which is arranged on the inlet pipe and return pipe of the immersion liquid to detect the inlet temperature and return temperature of the immersion liquid; a variable frequency liquid pump, which is connected to the inlet pipe or return pipe of the immersion liquid to drive the immersion liquid to flow; a cooling liquid circuit assembly, which includes a heat exchanger for heat exchange between the immersion liquid and the cooling liquid and a cooling liquid pipeline for conveying the cooling liquid to the heat exchanger, and a throttle valve is connected to the cooling liquid pipeline; and a controller unit, which is electrically connected to the temperature detection unit, the variable frequency liquid pump and the throttle valve, and is used to control the working frequency of the variable frequency liquid pump and the opening of the throttle valve according to the data measured by the temperature detection unit, so as to adjust the temperature of the immersion liquid.

Description

Technical Field

[0001] The present application relates to the technical field of immersion liquid cooling and heat dissipation, and in particular to a temperature control system for an immersion liquid cooling device. Background Art

[0002] As server computing power increases, server heat generation also increases dramatically, which places higher demands on server heat dissipation. Traditional air cooling can no longer meet high-intensity heat dissipation requirements, while liquid cooling has been widely used in server heat dissipation due to its high heat dissipation efficiency.

[0003] At present, immersion liquid cooling has been applied to scenarios with high heat dissipation requirements such as servers. The server is immersed in whole or in part in a chassis filled with an insulating cooling medium to directly exchange heat with the insulating cooling medium to achieve heat dissipation. After a long period of continuous heat dissipation, when the temperature of the insulating cooling medium rises, the insulating cooling medium needs to be circulated and cooled before being transported back to the chassis. In the current prior art, the circulating refrigeration of the insulating cooling medium is performed by a water pump to draw the insulating cooling medium through a heat exchanger for cooling. Its refrigeration performance cannot be flexibly adjusted, and the regulation of the insulating cooling medium temperature is often not precise enough.

[0004] In view of this, it is necessary to propose a new technical solution to overcome the shortcomings of the prior art. Utility Model Content

[0005] Based on this, the present application provides a temperature control system for an immersion liquid cooling device, which can accurately control the temperature of the immersion liquid in the immersion liquid cooling device to ensure the stability of heat dissipation of the immersion liquid cooling device.

[0006] To this end, the present application adopts the following technical solution: a temperature control system for an immersion liquid cooling device, comprising an immersion liquid cooling device and a temperature control device connected to the immersion liquid cooling device by heat exchange, the immersion liquid cooling device is filled with immersion liquid, the immersion liquid flows to the temperature control device through a liquid inlet pipe, and flows back to the immersion liquid cooling device through a liquid return pipe, wherein the temperature control device comprises:

[0007] A temperature detection unit, disposed on the liquid inlet pipe and the liquid return pipe of the immersion liquid, for detecting the liquid inlet temperature and the liquid return temperature of the immersion liquid;

[0008] A variable frequency liquid pump connected to a liquid inlet pipe or a liquid return pipe of the immersion liquid to drive the immersion liquid to flow;

[0009] a cooling liquid circuit assembly, comprising a heat exchanger for performing heat exchange between the immersion liquid and the cooling liquid and a cooling liquid pipeline for conveying the cooling liquid to the heat exchanger, wherein a throttle valve is connected to the cooling liquid pipeline; and

[0010] The controller unit is electrically connected to the temperature detection unit, the variable frequency liquid pump and the throttle valve. The controller unit controls the operating frequency of the variable frequency liquid pump and the opening of the throttle valve according to the data measured by the temperature detection unit to adjust the temperature of the immersion liquid.

[0011] In one embodiment, the controller unit includes a PID frequency adjustment module, and the PID frequency adjustment module adjusts the operating frequency of the variable frequency liquid pump according to the following formula:

[0012] f(t)=f(t-1)+Kp*[△T(t)-△T(t-1)]+Ki*[△T(t)-SP1]*dt+Kd*{[△T(t)-△T(t-1)]-[△T(t-1)-△T(t-2)]} / dt;

[0013] Among them, f(t) represents the operating frequency of the variable frequency liquid pump at time t, f(t-1) represents the operating frequency of the variable frequency liquid pump at time t-1, △T(t) represents the difference between the inlet temperature and the return temperature at time t, △T(t-1) represents the difference between the inlet temperature and the return temperature at time t-1, △T(t-2) represents the difference between the inlet temperature and the return temperature at time t-2, SP1 represents the target temperature difference, dt represents the time interval between two adjacent moments, Kp represents the proportional coefficient, Ki represents the integral coefficient, and Kd represents the differential coefficient.

[0014] In one embodiment, the controller unit includes a PID opening adjustment module, and the PID opening adjustment module adjusts the opening of the throttle valve according to the following formula:

[0015] P(t)=P(t-1)+Kp*[T(t)-T(t-1)]+Ki*[T(t)-SP2]*dt+Kd*

[0016] {[T(t)-T(t-1)]-[T(t-1)-T(t-2)]} / dt;

[0017] Among them, P(t) represents the opening of the throttle valve at time t, P(t-1) represents the opening of the throttle valve at time t-1, T(t) represents the inlet liquid temperature at time t, T(t-1) represents the inlet liquid temperature at time t-1, T(t-2) represents the inlet liquid temperature at time t-2, SP2 represents the target inlet liquid temperature, dt represents the time interval between two adjacent moments, Kp represents the proportional coefficient, Ki represents the integral coefficient, and Kd represents the differential coefficient.

[0018] In one embodiment, the temperature control device includes a housing, and the liquid inlet pipe, the liquid return pipe, the temperature detection unit, the variable frequency liquid pump, the coolant circuit component and the controller unit are all assembled in the housing.

[0019] In one embodiment, the liquid inlet pipe and the liquid return pipe have a first interface exposed from the housing, and the first interface is connected to a second interface exposed from the immersion liquid cooling device through a connecting pipe.

[0020] In one embodiment, the second interface includes a liquid outlet and a liquid return port, and the liquid return port is located below the liquid outlet.

[0021] In one embodiment, the liquid outlets are multiple and are arranged at the same height.

[0022] In one embodiment, the connecting pipe is detachably connected to the first interface and the second interface.

[0023] In one of the embodiments, the temperature control device is disposed outside the immersion liquid cooling device and can be independently moved relative to the immersion liquid cooling device after the connecting pipe is removed.

[0024] In one of the embodiments, the immersion liquid cooling device is a single-phase immersion liquid cooling device.

[0025] Compared with the prior art, the temperature control system of the immersion liquid cooling device provided in the present application includes a variable frequency liquid pump for driving the flow of immersion liquid and a throttle valve connected to the cooling liquid pipeline. The controller unit controls the operating frequency of the variable frequency liquid pump and the opening of the throttle valve according to the data measured by the temperature detection unit, thereby accurately regulating the temperature of the immersion liquid, ensuring the stability of the heat dissipation performance of the immersion liquid cooling device, and improving the reliability and life of the server cooled by it. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic diagram of an embodiment of a temperature control system of an immersion liquid cooling device provided in the present application.

[0028] Figure 2 This is a schematic diagram of the control flow of the operating frequency of a variable frequency liquid pump in one embodiment of a temperature control system for an immersion liquid cooling device provided in the present application.

[0029] Figure 3 A schematic diagram of the throttle valve opening control process in one embodiment of the temperature control system of the immersion liquid cooling device provided in the present application.

[0030] The reference numerals of the components are as follows:

[0031] 10. Immersion liquid cooling device; 1. Connecting pipe; 20. Temperature control device; 21. Heat exchanger; 22. Liquid inlet pipe; 221. Liquid inlet temperature sensor; 23. Liquid return pipe; 231. Liquid return temperature sensor; 24. Variable frequency liquid pump; 25. Controller unit; 251. PID frequency adjustment module; 252. PID opening adjustment module; 26. Coolant pipeline; 27. Throttle valve. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0033] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are in contact indirectly through an intermediate medium. Moreover, a first feature being “above”, “above”, or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0037] See also Figures 1 to 3 As shown, the present application provides a temperature control system for an immersion liquid cooling device. In one embodiment, the temperature control system for the immersion liquid cooling device includes an immersion liquid cooling device 10 and a temperature control device 20 connected to the immersion liquid cooling device 10 for heat exchange. The immersion liquid cooling device 10 is filled with an immersion liquid, and the immersion liquid flows to the temperature control device 20 through a liquid inlet pipe 22 and flows back to the immersion liquid cooling device 10 through a liquid return pipe 23. The temperature control device 20 includes a temperature detection unit, a variable frequency liquid pump 24, a coolant circuit assembly, and a controller unit 25.

[0038] The temperature detection unit is provided on the inlet pipe 22 and the return pipe 23 of the immersion liquid to detect the inlet temperature and the return temperature of the immersion liquid. The inlet temperature is the temperature of the immersion liquid when it flows out of the immersion liquid cooling device 10 and flows into the temperature control device 20, and the return temperature is the temperature of the immersion liquid when it flows out of the temperature control device 20 and flows back to the immersion liquid cooling device 10. The temperature detection unit includes an inlet temperature sensor 221 for detecting the inlet temperature and a return temperature sensor 231 for detecting the return temperature.

[0039] The variable frequency liquid pump 24 is connected to the liquid inlet pipe 22 or the liquid return pipe 23 of the immersion liquid to drive the immersion liquid to flow. In this embodiment, the variable frequency liquid pump 24 is arranged on the liquid inlet pipe 22. In other embodiments, the variable frequency liquid pump 24 can also be arranged on the liquid return pipe 23. In other embodiments, the variable frequency liquid pump 24 can also be arranged on both the liquid inlet pipe 22 and the liquid return pipe 23. The variable frequency liquid pump 24 is a frequency adjustable pump. When its frequency changes, the flow state of the immersion liquid it transports changes. Obviously, the flow rate of the immersion liquid changes. In addition, the flow pressure, rate, efficiency, etc. of the immersion liquid will also change accordingly.

[0040] The cooling liquid circuit assembly includes a heat exchanger 21 for heat exchange between the immersion liquid and the cooling liquid and a cooling liquid pipeline 26 for conveying the cooling liquid to the heat exchanger 21, and a throttle valve 27 is connected to the cooling liquid pipeline 26. The immersion liquid is a medium used for heat dissipation of products such as immersion servers, which is usually an insulating medium; the cooling liquid is a refrigeration medium used for heat exchange with the immersion liquid to cool the immersion liquid. Since it circulates in the cooling liquid pipeline 26 and does not directly contact the electronic components, it can use an insulating medium or a non-insulating medium, such as the refrigerant commonly used in the refrigeration system. The throttle valve 27 is an electronic throttle valve, which can be controlled by an electrical signal to achieve on, off and opening adjustment. The heat exchanger 21 is a component that can increase the contact area to make the heat exchange more sufficient, and common ones include finned heat exchangers.

[0041] The controller unit 25 is electrically connected to the temperature detection unit, the variable frequency liquid pump 24 and the throttle valve 27. The controller unit 25 controls the operating frequency of the variable frequency liquid pump 24 and the opening of the throttle valve 27 according to the data measured by the temperature detection unit to adjust the temperature of the immersion liquid.

[0042] The temperature control system of the immersion liquid cooling device provided in the present application includes a variable frequency liquid pump 24 for driving the flow of immersion liquid and a throttle valve 27 connected to the cooling liquid pipeline 26. The controller unit 25 controls the operating frequency of the variable frequency liquid pump 24 and the opening of the throttle valve 27 according to the data measured by the temperature detection unit, so that the temperature of the immersion liquid can be accurately controlled, thereby ensuring the stability of the heat dissipation performance of the immersion liquid cooling device 10 and improving the reliability and life of the server cooled by it.

[0043] Furthermore, in one embodiment, the controller unit 25 includes a PID frequency adjustment module 251, and the PID frequency adjustment module 251 adjusts the operating frequency of the variable frequency liquid pump 24 according to the following formula:

[0044] f(t)=f(t-1)+Kp*[△T(t)-△T(t-1)]+Ki*[△T(t)-SP1]*dt+Kd*{[△T(t)-△T(t-1)]-[△T(t-1)-△T(t-2)]} / dt;

[0045] Among them, f(t) represents the operating frequency of the variable frequency liquid pump at time t, f(t-1) represents the operating frequency of the variable frequency liquid pump at time t-1, △T(t) represents the difference between the inlet temperature and the return temperature at time t, △T(t-1) represents the difference between the inlet temperature and the return temperature at time t-1, △T(t-2) represents the difference between the inlet temperature and the return temperature at time t-2, SP1 represents the target temperature difference, dt represents the time interval between two adjacent moments, Kp represents the proportional coefficient, Ki represents the integral coefficient, and Kd represents the differential coefficient.

[0046] Furthermore, in one embodiment, the controller unit 25 includes a PID opening adjustment module 252, and the PID opening adjustment module 252 adjusts the opening of the throttle valve 27 according to the following formula:

[0047] P(t)=P(t-1)+Kp*[T(t)-T(t-1)]+Ki*[T(t)-SP2]*dt+Kd*

[0048] {[T(t)-T(t-1)]-[T(t-1)-T(t-2)]} / dt;

[0049] Among them, P(t) represents the opening of the throttle valve at time t, P(t-1) represents the opening of the throttle valve at time t-1, T(t) represents the inlet liquid temperature at time t, T(t-1) represents the inlet liquid temperature at time t-1, T(t-2) represents the inlet liquid temperature at time t-2, SP2 represents the target inlet liquid temperature, dt represents the time interval between two adjacent moments, Kp represents the proportional coefficient, Ki represents the integral coefficient, and Kd represents the differential coefficient.

[0050] The PID algorithm is used to control the operating frequency of the variable frequency liquid pump 24 and the opening of the throttle valve 27, so that the temperature of the immersion liquid can be more accurately controlled. Controlling the operating frequency of the variable frequency liquid pump 24 can adjust the flow of the immersion liquid, and controlling the opening of the throttle valve 27 can adjust the flow of the coolant. The combination of the two can make the temperature of the immersion liquid reach the target temperature quickly and accurately.

[0051] In one embodiment, the temperature control device 20 is an independent module relative to the immersion liquid cooling device 10, and the temperature control device 20 includes a shell, and the liquid inlet pipe 22, the liquid return pipe 23, the temperature detection unit, the variable frequency liquid pump 24, the coolant circuit assembly and the controller unit 25 are all assembled in the shell. The temperature control device 20 is connected to the immersion liquid cooling device 10 only through the connecting pipe 1 to achieve the entry and exit of the immersion liquid; specifically, in one embodiment, the liquid inlet pipe 22 and the liquid return pipe 23 have a first interface exposed from the shell, and the first interface is connected to the second interface exposed on the immersion liquid cooling device 10 through the connecting pipe 1. In one embodiment, the second interface includes a liquid outlet and a liquid return port, the liquid outlet is a connection port for the immersion liquid to flow out of the immersion liquid cooling device 10, and the liquid return port is a connection port for the immersion liquid to flow back to the immersion liquid cooling device 10, and the liquid return port is located below the liquid outlet, so that the cold flow is below and the hot flow is above, which is more conducive to the extraction and heat dissipation of the hot flow. In one embodiment, the liquid outlets are multiple and are arranged at the same height, so that one or more liquid outlets can be selected for connection according to the required flow rate, and when the heat dissipation is uneven, the liquid outlets close to the high-heat area can be preferably connected to output the immersion liquid for heat exchange. In this embodiment, the connecting pipe 1 is detachably connected to the first interface and the second interface, and the temperature control device 20 is arranged outside the immersion liquid cooling device 10, and can be independently moved relative to the immersion liquid cooling device 10 after the connecting pipe 1 is removed, so as to facilitate use. In this embodiment, the immersion liquid cooling device 10 is a single-phase immersion liquid cooling device, that is, the immersion liquid is always in liquid state during use and no phase change occurs.

[0052] The temperature control method using the above system can be used to control the temperature of the immersion liquid in the immersion liquid cooling device 10. The immersion liquid is driven by the variable frequency liquid pump 24 to flow and flows through the coolant circuit component of the throttle valve 27 to control the flow of the coolant for heat exchange. The temperature control method includes:

[0053] Detecting an inlet temperature and a return temperature of the immersion liquid, wherein the inlet temperature is the temperature of the immersion liquid when it flows out of the immersion liquid cooling device 10, and the return temperature is the temperature of the immersion liquid when it flows back into the immersion liquid cooling device 10;

[0054] The operating frequency of the variable frequency liquid pump 24 and the opening of the throttle valve 27 are adjusted according to the liquid inlet temperature and the liquid return temperature to change the flow state of the immersion liquid and the flow state of the cooling liquid.

[0055] In one embodiment, the operating frequency of the variable frequency liquid pump 24 is controlled by the following PID algorithm:

[0056] f(t)=f(t-1)+Kp*[△T(t)-△T(t-1)]+Ki*[△T(t)-SP1]*dt+Kd*{[△T(t)-△T(t-1)]-[△T(t-1)-△T(t-2)]} / dt;

[0057] Among them, f(t) represents the operating frequency of the variable frequency liquid pump at time t, f(t-1) represents the operating frequency of the variable frequency liquid pump at time t-1, △T(t) represents the difference between the inlet temperature and the return temperature at time t, △T(t-1) represents the difference between the inlet temperature and the return temperature at time t-1, △T(t-2) represents the difference between the inlet temperature and the return temperature at time t-2, SP1 represents the target temperature difference, dt represents the time interval between two adjacent moments, Kp represents the proportional coefficient, Ki represents the integral coefficient, and Kd represents the differential coefficient.

[0058] In one embodiment, the opening of the throttle valve 27 is controlled by the following PID algorithm:

[0059] P(t)=P(t-1)+Kp*[T(t)-T(t-1)]+Ki*[T(t)-SP2]*dt+Kd*

[0060] {[T(t)-T(t-1)]-[T(t-1)-T(t-2)]} / dt;

[0061] Among them, P(t) represents the opening of the throttle valve at time t, P(t-1) represents the opening of the throttle valve at time t-1, T(t) represents the inlet liquid temperature at time t, T(t-1) represents the inlet liquid temperature at time t-1, T(t-2) represents the inlet liquid temperature at time t-2, SP2 represents the target inlet liquid temperature, dt represents the time interval between two adjacent moments, Kp represents the proportional coefficient, Ki represents the integral coefficient, and Kd represents the differential coefficient.

[0062] The temperature control method is performed by a temperature control device 20. In one embodiment, the temperature control device 20 is independent of the immersion liquid cooling device 10 and is connected to the immersion liquid cooling device 10 through a connecting pipe 1. The temperature control device 20 includes a shell, and a liquid inlet pipe 22, a liquid return pipe 23, a temperature detection unit, a variable frequency liquid pump 24, a coolant circuit assembly and a controller unit 25 assembled in the shell.

[0063] From the above description of multiple specific embodiments, it can be seen that compared with the prior art, the temperature control system of the immersion liquid cooling device provided in the present application includes a variable frequency liquid pump 24 for driving the flow of immersion liquid and a throttle valve 27 connected to the coolant pipeline 26. The controller unit 25 controls the operating frequency of the variable frequency liquid pump 24 and the opening of the throttle valve 27 according to the data measured by the temperature detection unit, so that the temperature of the immersion liquid can be accurately controlled, thereby ensuring the stability of the heat dissipation performance of the immersion liquid cooling device 10 and improving the reliability and life of the server cooled by it.

[0064] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0065] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A temperature control system for an immersion liquid cooling device, comprising an immersion liquid cooling device and a temperature control device connected to the immersion liquid cooling device by heat exchange, wherein the immersion liquid cooling device is filled with an immersion liquid, the immersion liquid flows to the temperature control device through a liquid inlet pipe, and flows back to the immersion liquid cooling device through a liquid return pipe, characterized in that: The temperature control device comprises: A temperature detection unit, disposed on the liquid inlet pipe and the liquid return pipe of the immersion liquid, for detecting the liquid inlet temperature and the liquid return temperature of the immersion liquid; A variable frequency liquid pump connected to a liquid inlet pipe or a liquid return pipe of the immersion liquid to drive the immersion liquid to flow; a cooling liquid circuit assembly, comprising a heat exchanger for performing heat exchange between the immersion liquid and the cooling liquid and a cooling liquid pipeline for conveying the cooling liquid to the heat exchanger, wherein a throttle valve is connected to the cooling liquid pipeline; and The controller unit is electrically connected to the temperature detection unit, the variable frequency liquid pump and the throttle valve. The controller unit controls the operating frequency of the variable frequency liquid pump and the opening of the throttle valve according to the data measured by the temperature detection unit to adjust the temperature of the immersion liquid.

2. The temperature control system of the immersion liquid cooling device according to claim 1, characterized in that: The controller unit comprises a PID frequency adjustment module, and the PID frequency adjustment module is used to adjust the working frequency of the variable frequency liquid pump.

3. The temperature control system of the immersion liquid cooling device according to claim 1 or 2, characterized in that: The controller unit comprises a PID opening adjustment module, and the PID opening adjustment module is used to adjust the opening of the throttle valve.

4. The temperature control system of the immersion liquid cooling device according to claim 1, characterized in that: The temperature control device comprises a shell, and the liquid inlet pipe, the liquid return pipe, the temperature detection unit, the variable frequency liquid pump, the coolant circuit component and the controller unit are all assembled in the shell.

5. The temperature control system of the immersion liquid cooling device according to claim 4, characterized in that: The liquid inlet pipe and the liquid return pipe have a first interface exposed from the shell, and the first interface is connected to a second interface exposed on the immersion liquid cooling device through a connecting pipe.

6. The temperature control system of the immersion liquid cooling device according to claim 5, characterized in that: The second interface includes a liquid outlet and a liquid return port, and the liquid return port is located below the liquid outlet.

7. The temperature control system of the immersion liquid cooling device according to claim 6, characterized in that: The liquid outlets are multiple and are arranged at the same height.

8. The temperature control system of the immersion liquid cooling device according to claim 5, characterized in that: The connecting pipe is detachably connected to the first interface and the second interface.

9. The temperature control system of the immersion liquid cooling device according to claim 8, characterized in that: The temperature control device is arranged outside the immersion liquid cooling device, and can move independently relative to the immersion liquid cooling device after the connecting pipe is removed.

10. The temperature control system of the immersion liquid cooling device according to claim 1, characterized in that: The immersion liquid cooling device is a single-phase immersion liquid cooling device.

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