Voltage stabilization module and liquid cooling system

Abstract

The utility model discloses a voltage stabilization module and a liquid cooling system. Wherein the pressure stabilizing module comprises an expansion tank, a first pipeline and a second pipeline; the expansion tank is provided with a liquid inlet and a liquid outlet; one end of the first pipeline is connected with the liquid inlet, and the other end is communicated with a liquid supply pipeline of the liquid cooling system; one end of the second pipeline is connected with the liquid outlet, and the other end is communicated with a liquid return pipeline of the liquid cooling system. The liquid can flow in the first pipeline and the second pipeline through the pressure difference between the liquid supply pipeline and the liquid return pipeline, so that the liquid remained in the expansion tank can be driven to flow, circulate and dilute, the liquid deterioration caused by dead water formed in the expansion tank is effectively avoided, the cleanliness of the circulating flowing liquid in the system is kept, and the normal operation of the system is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of data center cold plate liquid cooling system, and particularly relates to a pressure stabilizing module and a liquid cooling system. BACKGROUND

[0002] The data center liquid cooling system belongs to a closed circulation system, and an expansion tank is usually arranged for the data center liquid cooling system to balance the hydraulic pressure of the system. When the system pressure is greater than the tank pressure of the expansion tank, the liquid in the system can enter the expansion tank, and when the system pressure is less than the tank pressure of the expansion tank, the liquid in the expansion tank can be supplemented to the system.

[0003] However, in actual use, the liquid pressure changes little after the liquid cooling system is stably operated, so that little liquid enters or exits the expansion tank, and most of the liquid in the tank forms dead water because it cannot flow. The dead water is prone to breed bacteria and dirt, and when the liquid in the tank is supplemented to the system, the bacteria and dirt generated by the dead water also enter the system, which is prone to cause the heat exchange plate and the server cold plate to be dirty and blocked and corroded, thereby affecting the normal operation of the system. CONTENT OF THE UTILITY MODEL

[0004] To solve at least one of the above technical problems, the present application provides a pressure stabilizing module and a liquid cooling system, which can prevent the formation of dead water in the expansion tank by using the pressure difference between the liquid supply pipeline and the liquid return pipeline. The technical solutions adopted are as follows.

[0005] In a first aspect, the present application provides a pressure stabilizing module applied to a liquid cooling system, comprising an expansion tank, a first pipeline and a second pipeline. The expansion tank is provided with a liquid inlet and a liquid outlet. One end of the first pipeline is connected with the liquid inlet, and the other end is in communication with a liquid supply pipeline of the liquid cooling system. One end of the second pipeline is connected with the liquid outlet, and the other end is in communication with a liquid return pipeline of the liquid cooling system.

[0006] In some embodiments of the present application, the expansion tank is a bladder type expansion tank.

[0007] In some embodiments of the present application, the liquid inlet and the liquid outlet of the expansion tank are both arranged at the bottom of the expansion tank.

[0008] In some embodiments of the present application, the expansion tank is provided with a liquid inlet pipe, one end of which is connected with the liquid inlet, and the other end of which extends into the expansion tank.

[0009] In some embodiments of the present application, the first pipeline is provided with an electric valve.

[0010] In some embodiments of the present application, the electric valve is provided with a time control element for controlling the electric valve to be opened or closed at a preset time.

[0011] In some embodiments of the present application, the pipe diameter of the first pipeline is smaller than the pipe diameter of the second pipeline.

[0012] In some embodiments of the present application, the first pipeline is provided with a ball valve, and the second pipeline is provided with a hand valve and an exhaust valve.

[0013] In some embodiments of the present application, the bottom of the expansion tank is provided with a blowdown pipe.

[0014] In a second aspect, the present application provides a liquid cooling system, which comprises a heat exchanger and the pressure stabilizing module provided in the first aspect of the present application, a liquid supply pipeline connected to the outlet of one of the heat exchange sides of the heat exchanger, and a liquid return pipeline connected to the inlet of one of the heat exchange sides of the heat exchanger.

[0015] The embodiments of the present application have at least the following beneficial effects: the cooling medium flows in the liquid cooling system with a pressure drop, a water pump is arranged in the cooling capacity distribution unit to pressurize the cooling medium to overcome the pipeline resistance and ensure that the cooling medium can complete the circulating flow in the pipeline, therefore, there is always a pressure difference between the liquid supply pipeline and the liquid return pipeline in the liquid cooling system, specifically, the pressure of the liquid supply pipeline is greater than the pressure of the liquid return pipeline. By connecting the first pipeline to the liquid supply pipeline and the liquid inlet of the expansion tank, and connecting the second pipeline to the liquid return pipeline and the liquid outlet of the expansion tank, the pressure difference between the liquid supply pipeline and the liquid return pipeline can make the liquid flow in the first pipeline and the second pipeline, that is, the cooling medium in the pipeline can enter the expansion tank through the first pipeline, then flow out of the expansion tank and enter the liquid return pipeline through the second pipeline, and form a circulating flow. When the cooling medium flows through the expansion tank, it can drive the liquid remaining in the expansion tank to flow and dilute, effectively avoiding the formation of dead water in the expansion tank to cause the liquid to deteriorate, thereby maintaining the cleanliness of the circulating liquid in the system and ensuring the normal operation of the system. BRIEF DESCRIPTION OF DRAWINGS

[0016] The present application will be further illustrated below in combination with the drawings and embodiments. It should be noted that the embodiments embodied in the following drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0017] Figure 1 The working principle schematic diagram of the pressure stabilizing module provided in the embodiments of the present application is shown in the figure;

[0018] Figure 2 The structure schematic diagram of the expansion tank provided in the embodiments of the present application is shown in the figure;

[0019] Figure 3 The A-A sectional view of the Figure 2 ;

[0020] Figure 4 The working logic schematic diagram of the time control element provided in the embodiments of the present application is shown in the figure;

[0021] Figure 5A liquid cooling system process schematic diagram provided by the embodiment of the application.

[0022] The figure reference: 100, voltage stabilizing module; 10, expansion tank; 11, liquid inlet; 12, liquid outlet; 13, liquid inlet pipe; 20, first pipe; 21, electric valve; 22, ball valve; 30, second pipe; 31, exhaust valve; 32, hand valve; 200, liquid supply pipe; 300, liquid return pipe; 400, heat exchanger. DETAILED DESCRIPTION

[0023] The embodiments of the application are described in detail below with reference to the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the application, and cannot be understood as a limitation on the application.

[0024] In the description of the application, it should be understood that if the terms "center", "middle", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and therefore cannot be understood as indicating or implying 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 application.

[0025] In the description of the application, if the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0026] In the description of the application, unless otherwise explicitly specified and limited, the terms "set", "mount", "connected", "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; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between the two elements inside. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0027] In the description of the present application, if the description of the term "as an embodiment", "an embodiment", "some examples", "some embodiments", "illustrative embodiments", "example", "specific example", "some examples" and the like appears, it means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present description, the illustrative description of the above terms does 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.

[0028] Please refer to Figure 1 , the present application provides a voltage stabilizing module 100 applied to a liquid cooling system, comprising an expansion tank 10, a first pipeline 20 and a second pipeline 30. Wherein, the expansion tank 10 is provided with a liquid inlet 11 and a liquid outlet 12; one end of the first pipeline 20 is connected with the liquid inlet 11, and the other end is communicated with a liquid supply pipeline 200 of the liquid cooling system; one end of the second pipeline 30 is connected with the liquid outlet 12, and the other end is communicated with a liquid return pipeline 300 of the liquid cooling system.

[0029] The cold distribution unit as a heat exchange unit in the liquid cooling system can be used to distribute cooling medium to the pipe network, and the cooling medium can reach the end device source through the liquid supply pipeline 200 in the pipe network and cool the device. After completing the cooling of the device, the cooling medium which has absorbed the heat of the device will flow to the heat exchanger 400 through the liquid return pipeline 300 for heat exchange and cooling, so that the cooling medium can be cooled and re-enter the liquid supply pipeline 200 to circulate and cool the device source.

[0030] The cooling medium flows in the liquid cooling system, and a water pump is arranged in the cold distribution unit to pressurize the cooling medium to overcome the pipeline resistance and ensure that the cooling medium can complete the circulation flow in the pipeline. Therefore, there is always a pressure difference between the liquid supply pipeline 200 and the liquid return pipeline 300 in the liquid cooling system, specifically, the pressure of the liquid supply pipeline 200 will be greater than that of the liquid return pipeline 300. By connecting the first pipeline 20 with the liquid inlet 11 of the expansion tank 10 and the liquid outlet 12 of the second pipeline 30 with the liquid return pipeline 300, the pressure difference between the liquid supply pipeline 200 and the liquid return pipeline 300 can make the liquid flow in the first pipeline 20 and the second pipeline 30, that is, the cooling medium in the pipeline can enter the expansion tank 10 through the first pipeline 20, then flow out of the expansion tank 10 and enter the liquid return pipeline 300 through the second pipeline 30, and form a circulating flow. When the cooling medium flows through the expansion tank 10, it can drive the liquid remaining in the expansion tank 10 to flow and dilute, effectively avoiding the formation of dead water in the expansion tank 10 to cause the liquid to deteriorate, so as to maintain the cleanliness of the circulating liquid in the system and ensure the normal operation of the system.

[0031] Optionally, the liquid inlet 11 and the liquid outlet 12 can be arranged at the bottom of the expansion tank 10 simultaneously; or the liquid inlet 11 can be arranged at the top of the expansion tank 10, and the liquid outlet 12 can be arranged at the bottom of the expansion tank 10; or the liquid inlet 11 and the liquid outlet 12 can be arranged at the sidewall of the expansion tank 10, and the liquid inlet 11 is arranged higher than the liquid outlet 12. It can be understood that a communication passage is formed between the liquid inlet 11 and the liquid outlet 12.

[0032] Exemplarily, the expansion tank 10 can be a gas bag type expansion tank or a diaphragm type expansion tank.

[0033] Please refer to Figures 2-3 In some embodiments, the expansion tank 10 is a bag type expansion tank. By using the bag type expansion tank, the liquid entering the expansion tank 10 can only enter the gas bag part of the tank body, and can not directly contact the inner wall of the tank body. Thus, the inner wall of the tank body can be prevented from rusting due to corrosion of the liquid, thereby prolonging the service life of the tank body. Meanwhile, the dust or stains accumulated on the inner wall of the tank body can also be prevented from polluting the liquid in the tank, thereby ensuring the cleanliness of the liquid flowing through the expansion tank 10.

[0034] In some embodiments, the liquid inlet 11 and the liquid outlet 12 of the expansion tank 10 are arranged at the bottom of the expansion tank 10. Since the expansion tank 10 is used for adjusting the hydraulic pressure in the system, the amount of liquid remaining in the expansion tank 10 will not be too much. By arranging the liquid inlet 11 and the liquid outlet 12 of the expansion tank 10 at the bottom of the expansion tank 10, the flow path of the cooling medium in the tank can be concentrated at the bottom of the expansion tank 10, i.e., the area where the liquid remains, after the cooling medium enters the expansion tank 10 through the first pipeline 20. Thus, the flow of the cooling medium can be ensured to sufficiently drive the flow of the liquid remaining in the expansion tank 10, and at the same time, the liquid remaining in the expansion tank 10 can be sufficiently diluted, thereby effectively inhibiting the formation of dead water in the expansion tank 10.

[0035] In some embodiments, the expansion tank 10 is provided with a liquid inlet pipe 13, one end of the liquid inlet pipe 13 is connected with the liquid inlet 11, and the other end of the liquid inlet pipe 13 extends into the expansion tank 10. By arranging the liquid inlet pipe 13 in the expansion tank 10, and connecting one end of the liquid inlet pipe 13 with the liquid inlet 11 and extending the other end of the liquid inlet pipe 13 into the expansion tank 10, the cooling medium can flow through the liquid inlet pipe 13 before entering the expansion tank 10. Thus, the actual liquid inlet position and the liquid outlet position of the cooling medium can form a height difference in the direction of gravity along the tank body, thereby prolonging the flow path of the cooling medium in the expansion tank 10, and further driving more liquid remaining in the tank to flow and at the same time more fully mixing and diluting the liquid remaining in the tank, thereby further improving the water quality in the expansion tank 10.

[0036] Optionally, the extension height of the liquid inlet pipe 13 relative to the liquid inlet port 11 can be set according to the liquid level of the liquid retained in the expansion tank 10. The extension height of the liquid inlet pipe 13 can be slightly higher than the liquid level of the liquid retained, or the extension height of the liquid inlet pipe 13 can be slightly lower than the liquid level of the liquid retained. Here, the extension height of the liquid inlet pipe 13 is not limited.

[0037] In some embodiments, the first pipeline 20 is provided with an electric valve 21. Since it takes a certain time for the dead water to form in the expansion tank 10, the liquid retained in the expansion tank 10 can maintain cleanliness for a certain period of time. By providing the electric valve 21 in the first pipeline 20, the opening and closing of the first pipeline 20 can be controlled, that is, the frequency of the cooling medium flowing into the expansion tank 10 to drive the liquid retained in the tank to flow and dilute can be controlled, so that the frequency of the cooling medium circulating through the expansion tank 10 can be controlled within a suitable range while maintaining the cleanliness of the liquid retained in the expansion tank 10, thereby improving the utilization efficiency of the cooling medium in the pipeline and reducing the energy consumption of the system.

[0038] Optionally, the electric valve 21 is in a normally closed state. It can be understood that the second pipeline 30 of the pressure stabilizing module 100 is in a normally open state. When the electric valve 21 is in a closed state, the first pipeline 20 is closed, the expansion tank 10 is connected to the liquid return pipeline 300 through the second pipeline 30, at this time, the pressure in the expansion tank 10 is the same as the pressure in the liquid return pipeline 300, the liquid in the second pipeline 30 is in a static state, and there is a pressure difference between the liquid supply pipeline 200 and the liquid return pipeline 300 in the liquid cooling system; when the electric valve 21 is adjusted to an open state, the expansion tank 10 is connected to the liquid supply pipeline 200 through the first pipeline 20, and the pressure difference between the liquid supply pipeline 200 and the liquid return pipeline 300 causes the flow path in the pressure stabilizing module 100 to have a pressure drop between port B and port C (see Figure 1 ), which can drive the cooling medium to flow from the liquid supply pipeline 200 through the first pipeline 20 into the expansion tank 10, and then enter the second pipeline 30 through the liquid outlet 12 of the expansion tank 10, and finally flow to the liquid return pipeline 300; when the liquid retained in the expansion tank 10 is sufficiently driven to flow and dilute, the electric valve 21 is adjusted to a closed state, at this time the first pipeline 20 is closed, the expansion tank 10 is connected to the liquid return pipeline 300 through the second pipeline 30, the pressure in the expansion tank 10 is the same as the pressure in the liquid return pipeline 300, and the liquid in the second pipeline 30 returns to a static state.

[0039] In some embodiments, the electric valve 21 is provided with a time control element for controlling the electric valve 21 to open or close at a preset time. By providing the electric valve 21 with a time control element, the electric valve 21 can automatically execute the opening or closing instruction according to the preset time, so that the timing of the circulation of the cooling medium in the pressure stabilizing module 100 can be accurately controlled, and the automatic cleaning of the liquid retained in the expansion tank 10 can be realized.

[0040] Optionally, referring to Figure 4 , the electric valve 21 can be controlled by the time control element to execute the open or close command according to the established flow cycle. Specifically, when the interval time is T2, the electric valve 21 executes the open command; when the open time reaches T1, the electric valve 21 executes the close command; wherein the specific values of T1 and T2 can be determined by pre-test, such as detecting the deterioration time of the liquid stored in the expansion tank 10 by pre-experiment to obtain the preset value of T2, and detecting the flow and dilution time required by the liquid stored in the expansion tank 10 by pre-experiment to obtain the preset value of T1; or, the preset values of T1 and T2 can also be set according to the conventional time interval of per hour, per day, per week, etc.

[0041] In some embodiments, the pipe diameter of the first pipeline 20 is smaller than the pipe diameter of the second pipeline 30. When the circulation loop of the cooling medium flowing through the expansion tank 10 is controlled by the electric valve 21, after the electric valve 21 is opened, the expansion tank 10 will change from the state of communicating with the liquid return pipeline 300 to the state of simultaneously communicating with the liquid return pipeline 300 and the liquid supply pipeline 200. Because the cooling medium needs to flow in the pressure stabilizing module 100 additionally, the pressure of the liquid return pipeline 300 will decrease slightly compared with before the electric valve 21 is opened. By setting the pipe diameter of the first pipeline 20 to be smaller than the pipe diameter of the second pipeline 30, the proportion of the flow resistance of the second pipeline 30 in the circulation loop of the pressure stabilizing module 100 can be reduced, thereby reducing the pressure difference between the tank of the expansion tank 10 and the liquid return pipeline 300, so as to improve the pressure drop phenomenon of the liquid return pipeline 300, thereby ensuring the normal operation of the liquid cooling system.

[0042] Optionally, the proportion of the flow resistance of the second pipeline 30 in the circulation loop of the pressure stabilizing module 100 can also be reduced by lengthening the pipe length of the first pipeline 20 or shortening the pipe length of the second pipeline 30.

[0043] In some embodiments, the first pipeline 20 is provided with a ball valve 22, and the second pipeline 30 is provided with a hand valve 32 and an exhaust valve 31. The ball valve 22 provided on the first pipeline 20 can effectively block the passage between the expansion tank 10 and the liquid supply pipeline 200, and the hand valve 32 provided on the second pipeline 30 can be used to block the passage between the expansion tank 10 and the liquid return pipeline 300. The provision of the ball valve 22 and the hand valve 32 can facilitate the regular maintenance of the expansion tank 10. It can be understood that the ball valve 22 is in a normally open state under the normal operating state of the pressure stabilizing module 100. When the ball valve 22 is closed, even if the electric valve 21 is in an open state, the cooling medium can be blocked from entering the expansion tank 10 through the first pipeline 20. By providing the exhaust valve 31 on the second pipeline 30, the pressure can be quickly released when the pressure in the expansion tank 10 exceeds the safety set value, thereby avoiding the blocking of the flow of the cooling medium when flowing through the expansion tank 10 due to the excessive gas pressure in the tank, and thus achieving the expected liquid retention and dilution effect in the tank.

[0044] Specifically, the ball valve 22 is arranged on the side of the first pipeline 20 close to the liquid supply pipeline 200, the hand valve 32 is arranged on the side of the second pipeline 30 close to the liquid return pipeline 300, and the exhaust valve 31 is arranged on the side of the second pipeline 30 close to the water outlet of the expansion tank 10.

[0045] Optionally, the first pipeline 20 is provided with two ball valves 22, and the two ball valves 22 are arranged on the two sides of the electric valve 21. At this time, by blocking the first pipeline 20 through the two ball valves 22, the electric valve 21 can be conveniently maintained and daily maintained.

[0046] Optionally, the exhaust valve 31 is connected with a pressure sensor. When the pressure sensor detects that the pressure in the expansion tank 10 exceeds the safety set value, the pressure sensor sends a signal to the exhaust valve 31, and the exhaust valve 31 automatically opens to release the pressure upon receiving the instruction. Alternatively, the exhaust valve 31 can be a manually operated exhaust valve 31, and the operator can independently release the pressure of the expansion tank 10 according to the pipeline pressure data of the liquid cooling system.

[0047] Optionally, the second pipeline 30 is further provided with a vent valve to quickly discharge the liquid in the pipeline in an emergency to prevent the pipeline pressure from being too high to cause damage to the system, thereby providing more comprehensive safety protection for the pipeline.

[0048] In some embodiments, the bottom of the expansion tank 10 is provided with a blowdown pipe. By providing the blowdown pipe at the bottom of the expansion tank 10, the waste water after cleaning can be conveniently discharged when the expansion tank 10 is cleaned, thereby avoiding the pollution of the waste water to the liquid outlet 12 when the waste water is discharged through the liquid outlet 12.

[0049] Please refer to Figure 5In the second aspect, the application provides a liquid cooling system, which comprises the heat exchanger 400 and the pressure stabilizing module 100 provided in the first aspect of the application. The liquid supply pipeline 200 is connected to the outlet of one of the heat exchange sides of the heat exchanger 400, and the liquid return pipeline 300 is connected to the inlet of one of the heat exchange sides of the heat exchanger 400. By applying the pressure stabilizing module 100 provided in the first aspect of the application to the liquid cooling system, the pressure difference between the liquid supply pipeline 200 and the liquid return pipeline 300 can be used to make the liquid in the expansion tank 10 flow, so as to avoid the formation of dead water and the breeding of bacteria.

[0050] Specifically, one end of the liquid supply pipeline 200 is connected to the outlet of one of the heat exchange sides of the heat exchanger 400, and the other end of the liquid supply pipeline 200 is connected to the liquid cooling cabinet. One end of the liquid return pipeline 300 is connected to the inlet of one of the heat exchange sides of the heat exchanger 400, and the other end of the liquid return pipeline 300 is connected to the liquid cooling cabinet. The other heat exchange side of the heat exchanger 400 is connected to a cold source. It can be understood that the cooling medium can be transported to the liquid cooling cabinet through the liquid supply pipeline 200 to cool the equipment in the cabinet. Subsequently, the cooling medium that absorbs the heat of the equipment flows into one of the heat exchange sides of the heat exchanger 400 through the liquid return pipeline 300, and transfers the heat to the cold source of the other heat exchange side of the heat exchanger 400 to realize the cooling of the cooling medium. After the cooling of the cooling medium is completed, the cooling medium flows from the outlet of one of the heat exchange sides of the heat exchanger 400 into the liquid supply pipeline, and the next cooling cycle is started. During the cooling cycle of the cooling medium, there is a pressure difference between the liquid supply pipeline 200 and the liquid return pipeline 300. Since the first pipeline 20 of the pressure stabilizing module 100 is connected to the liquid supply pipeline 200, the second pipeline 30 is connected to the liquid return pipeline 300, and the first pipeline 20 and the second pipeline 30 are both connected to the expansion tank 10, part of the cooling medium in the pipeline can enter the expansion tank 10 through the first pipeline 20, then flow out of the expansion tank 10 and enter the liquid return pipeline 300 through the second pipeline 30, so as to drive the liquid in the expansion tank 10 to flow and dilute, effectively avoiding the formation of dead water in the expansion tank 10, maintaining the cleanliness of the flowing liquid in the liquid cooling system, and ensuring the normal operation of the liquid cooling system.

[0051] The embodiments of the application are described in detail above with reference to the drawings, but the application is not limited to the above-described embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the purpose of the application. In addition, the embodiments of the application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A voltage regulator module, characterized by: The voltage stabilizing module is applied to a liquid cooling system, and comprises An expansion tank provided with a liquid inlet and a liquid outlet; A first pipeline, one end of which is connected with the liquid inlet, and the other end of which is communicated with a liquid supply pipeline of the liquid cooling system; A second pipeline, one end of which is connected with the liquid outlet, and the other end of which is communicated with a liquid return pipeline of the liquid cooling system.

2. The voltage regulator module of claim 1, wherein: The expansion tank is a bladder type expansion tank.

3. The voltage regulator module of claim 1, wherein: The liquid inlet and the liquid outlet of the expansion tank are arranged at the bottom of the expansion tank.

4. The voltage regulator module of claim 3, wherein: The expansion tank is provided with a liquid inlet pipe, one end of which is connected with the liquid inlet, and the other end of which extends into the expansion tank.

5. The voltage regulator module of any one of claims 1-4, wherein: The first pipeline is provided with an electric valve.

6. The voltage regulator module of claim 5, wherein: The electric valve is provided with a time control element for controlling the electric valve to be opened or closed at a preset time.

7. The voltage regulator module of claim 5, wherein: The pipe diameter of the first pipeline is smaller than that of the second pipeline.

8. The voltage regulator module of claim 5, wherein: The first pipeline is provided with a ball valve, and the second pipeline is provided with a hand valve and an exhaust valve.

9. The voltage regulator module of claim 1, wherein: The bottom of the expansion tank is provided with a blowdown pipe.

10. A liquid cooling system, characterized by: The liquid cooling system comprises a heat exchanger and the voltage stabilizing module according to any one of claims 1 to 9, the liquid supply pipeline is communicated with the outlet of one heat exchange side of the heat exchanger, and the liquid return pipeline is communicated with the inlet of one heat exchange side of the heat exchanger.

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