Liquid cooling system

Abstract

The invention provides a liquid cooling system, and relates to the field of heat exchange. A liquid cooling system comprises: a liquid storage tank; the first circulating pipeline is respectively connected with the liquid outlet and the first liquid return port of the liquid storage tank, and a first electromagnetic valve, a first self-priming pump and a second electromagnetic valve are sequentially arranged from the liquid outlet to the first liquid return port; the second circulating pipeline is respectively connected with a liquid separation port on the first circulating pipeline and a second liquid return port of the liquid storage tank, a third electromagnetic valve, a cold plate, a second self-priming pump and a heat exchanger are sequentially arranged from the liquid separation port to the second liquid return port, and the liquid separation port is formed between the first electromagnetic valve and the first self-priming pump on the first circulating pipeline; when the liquid cooling system works in a negative pressure mode, the negative pressure generated by the first self-priming pump is smaller than the negative pressure generated by the second self-priming pump, and the cold liquid circulating in the first circulating pipeline is pumped into the second circulating pipeline from the liquid separation opening to dissipate heat of the cold plate. Through the system, the heat dissipation reliability of the liquid cooling equipment can be improved.

Description

Technical Field

[0001] This specification relates to the field of heat exchange technology, and in particular to a liquid cooling system. Background Technology

[0002] With the development of network technology, the power consumption of chips in network devices such as routers, switches and servers is getting higher and higher. Air cooling is gradually reaching a bottleneck and can hardly meet the heat dissipation requirements of network devices. Therefore, liquid cooling has been introduced into network devices, forming liquid cooling equipment that includes coolant pipes and cold plates.

[0003] Since the coolant piping needs to be connected to the internal and external circulation through the insertion of joints and interfaces, coolant leakage and dripping may occur at the connection points. If the leaked coolant drips into the electronic components inside the liquid cooling equipment, it will cause damage to the electronic components. Therefore, how to reduce the occurrence of coolant leakage and dripping is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] To overcome the problems existing in related technologies, this specification provides a liquid cooling system.

[0005] According to a first aspect of the embodiments of this specification, a liquid cooling system is provided, comprising: liquid storage tank; The first circulation pipeline is connected to the outlet and the first return port of the liquid storage tank respectively. A first solenoid valve, a first self-priming pump and a second solenoid valve are sequentially arranged from the outlet to the first return port. The second circulation pipeline is connected to the liquid distribution port on the first circulation pipeline and the second return port of the liquid storage tank. A third solenoid valve, a cold plate, a second self-priming pump and a heat exchanger are arranged sequentially from the liquid distribution port to the second return port. The liquid distribution port is formed on the first circulation pipeline between the first solenoid valve and the first self-priming pump. The cold plate is arranged in the equipment to be cooled. When the liquid cooling system operates in negative pressure mode, the negative pressure generated by the first self-priming pump is less than the negative pressure generated by the second self-priming pump. The circulating coolant in the first circulation pipeline is drawn into the second circulation pipeline from the liquid distributor to dissipate heat from the cold plate.

[0006] Optional, the liquid cooling system also includes: A bypass pipeline, one end of which is connected to the first self-priming pump and the second solenoid valve of the first circulation pipeline, and the other end of which is connected between the third solenoid valve of the second circulation pipeline and the cold plate. A fourth solenoid valve is provided on the bypass pipeline. When the first solenoid valve, the second solenoid valve, and the third solenoid valve are open and the fourth solenoid valve is closed, the liquid cooling system operates in negative pressure mode.

[0007] Optionally, when the first solenoid valve and the fourth solenoid valve are open and the second solenoid valve and the third solenoid valve are closed, the liquid cooling system operates in enhanced mode, and the coolant in the first circulation pipeline enters the second circulation pipeline through the bypass pipeline to dissipate heat from the cold plate.

[0008] Optional, the liquid cooling system also includes: A first pressure sensor, disposed on the inlet side of the cold plate, is used to detect a first pressure value; and, A second pressure sensor is located on the outlet side of the cold plate to detect a second pressure value. CDU is electrically connected to the first pressure sensor and the second pressure sensor, respectively; When the liquid cooling system is operating in negative pressure mode, if the difference between the second pressure value and the first pressure value determined by the CDU is less than the pressure threshold, the CDU controls the liquid cooling system to switch to enhanced mode.

[0009] Optional, the liquid cooling system also includes: The CDU is used to collect the temperature value of the device to be cooled; if the collected temperature value is greater than the temperature threshold when the liquid cooling system is operating in negative pressure mode, the CDU controls the liquid cooling system to switch to enhanced mode.

[0010] Optionally, the CDU obtains the temperature value of the heat-generating device in the device to be cooled via the baseboard management controller (BMC) in the device to be cooled.

[0011] Optional, the liquid cooling system also includes: A temperature sensor is installed in the device to be cooled and is electrically connected to the CDU, wherein the temperature value is acquired by the temperature sensor and transmitted to the CDU.

[0012] Optional, the liquid cooling system also includes: An air intake pipe is provided at the air inlet between the cold plate and the second self-priming pump, and a fifth solenoid valve is provided on the air intake pipe. When the second, third, and fifth solenoid valves are open and the first and fourth solenoid valves are closed, the liquid cooling system operates in recovery mode. Under the action of the first and second self-priming pumps, the air drawn in from the suction line pushes the coolant in the first and second circulation lines back into the storage tank.

[0013] Optional, the liquid cooling system also includes: An exhaust valve is installed on the second circulation pipeline between the heat exchanger and the second self-priming pump.

[0014] Optionally, a liquid cooling system may be used, wherein the heat exchanger is either an air-cooled heat exchanger or a liquid-cooled heat exchanger.

[0015] The technical solutions provided in the embodiments of this specification may include the following beneficial effects: In this embodiment, the liquid cooling system includes a first circulation pipeline and a second circulation pipeline. A first self-priming pump is installed on the first circulation pipeline, and a second self-priming pump is installed on the second circulation pipeline. When the first self-priming pump is running, the coolant circulates in the storage tank and the first circulation pipeline. The second self-priming pump, with a pressure at its inlet greater than that of the first self-priming pump, draws the coolant circulating in the first circulation pipeline into the second circulation pipeline from the distributor port. The coolant is then cooled by a cooling plate installed in the second circulation pipeline. Because a negative pressure circulation is formed between the first and second circulation pipelines, the leakage and dripping of coolant from the connection points of the circulation pipelines are reduced, thus improving the reliability of the liquid cooling system in cooling electronic equipment.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this specification. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this specification and, together with the description, serve to explain the principles of this specification.

[0018] Figure 1 This is a schematic diagram of the structure of a liquid cooling system involved in this application; Figure 2 This application Figure 1 The diagram shows the flow direction of the coolant in a liquid cooling system according to the embodiment shown. Figure 3 This is a schematic diagram of a liquid cooling system according to an embodiment of this application, wherein a bypass pipe is provided in the liquid cooling system; Figure 4 This application Figure 3 The diagram shows the flow direction of the coolant in a liquid cooling system according to the embodiment shown. Figure 5 This is a schematic diagram of a liquid cooling system according to an embodiment of this application, wherein the liquid cooling system is provided with an air intake pipe; Figure 6 This application Figure 5 The diagram shows the flow direction of the coolant in a liquid cooling system according to the embodiment shown. Figure 7 This is a schematic diagram of a liquid cooling system according to an embodiment of this application, wherein an exhaust valve is provided in the liquid cooling system. Detailed Implementation

[0019] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this specification. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this specification as detailed in the appended claims.

[0020] The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of this specification. The singular forms “a,” “the,” and “the” as used in this specification and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0021] It should be understood that although the terms first, second, third, etc., may be used in this specification to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this specification, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0022] This application provides a liquid cooling system 100, such as Figure 1 As shown, it includes: A liquid storage tank 1, which may be equipped with an outlet 10, a first return outlet 11, and a second return outlet 12; The first circulation pipeline 2 is connected to the outlet 10 and the first return port 11 of the liquid storage tank 1 respectively. A first solenoid valve 30, a first self-priming pump 40 and a second solenoid valve 31 are sequentially arranged from the outlet 10 to the first return port 11. The second circulation pipeline 5 is connected to the liquid distribution port 20 on the first circulation pipeline 2 and the second return port 12 of the liquid storage tank 1. A third solenoid valve 32, a cold plate 6, a second self-priming pump 41 and a heat exchanger 7 are arranged sequentially from the liquid distribution port 20 to the second return port 12. The liquid distribution port 20 is formed on the first circulation pipeline 2 between the first solenoid valve 30 and the first self-priming pump 40. The cold plate 6 is arranged in the heat dissipation device (not shown). When the liquid cooling system 100 is operating in negative pressure mode, the negative pressure generated by the first self-priming pump 40 is less than the negative pressure generated by the second self-priming pump 41. The cool liquid circulating in the first circulation pipeline 2 is drawn into the second circulation pipeline 5 from the liquid distribution port 20 to dissipate heat from the cold plate 6.

[0023] The first solenoid valve 30, the second solenoid valve 31, and the third solenoid valve 32 can be opened and closed by a controller. The first self-priming pump 40 and the second self-priming pump 41 can be started and stopped by a controller, and their power can be controlled by the controller to control the magnitude of the negative pressure generated by the first self-priming pump 40 and the second self-priming pump 41. The cold plate 6 is disposed in the equipment to be cooled and can be attached to the heat-generating components of the equipment, such as processors, logic chips, etc. The liquid cooling system 100 may also include other valves and / or other detection devices, without limitation.

[0024] When the liquid cooling system 100 needs to operate in negative pressure mode, at least the first solenoid valve 30 and the second solenoid valve 31 are opened, and the first self-priming pump 40 is started. At this time, under the negative pressure generated by the first self-priming pump 40, the coolant in the storage tank 1 is drawn out from the outlet 10 and returns to the storage tank 1 along the first circulation pipeline 2 to the first return port 11 to form a circulation.

[0025] Then, the third solenoid valve 32 is opened, and the second self-priming pump 41 is started. At this time, the negative pressure generated by the second self-priming pump 41 is greater than that generated by the first self-priming pump 40. For example, if the negative pressure generated by the first self-priming pump 40 is 5 kPa, the negative pressure generated by the second self-priming pump 41 is 60 kPa. The coolant circulating in the first circulation pipeline 2 can be drawn from the distributor port 20 into the second circulation pipeline 5, and then along the second circulation pipeline 5, it passes through the cold plate to dissipate heat from the heat dissipation equipment, then passes through the heat exchanger 7 for further cooling, and finally returns to the storage tank 1 through the second return port 12. The flow pattern of the coolant is as follows: Figure 2 As shown, this achieves the heat dissipation cycle of the coolant.

[0026] It should be noted that the opening of the first solenoid valve 30, the second solenoid valve 31, and the third solenoid valve 32, as well as the starting of the first self-priming pump 40 and the second self-priming pump 41, can be performed in a time-sharing manner as described above. That is, the circulation of the coolant in the first circulation pipeline 2 can be achieved first, and then the circulation of the coolant in the second circulation pipeline 5 can be achieved. Alternatively, the circulation of the first circulation pipeline 2 and the second circulation pipeline 5 can be performed at approximately the same time to achieve the circulation of the first circulation pipeline 2 and the third circulation pipeline 5.

[0027] In the aforementioned liquid cooling system 100, the liquid cooling system 100 operates under negative pressure by circulating the coolant through two circulation pipes, thereby reducing the leakage and dripping of coolant at the pipe connections and improving the reliability of liquid cooling heat dissipation.

[0028] The devices to be cooled can be network devices such as routers, switches, and servers. The liquid cooling system 100 can provide liquid cooling for multiple devices through piping configuration. In the liquid cooling system 100, the control of solenoid valves and self-priming pumps can be achieved through CDUs (Cooling Distribution Units), and the mode control of the liquid cooling system 100 can be realized based on parameters collected from the devices to be cooled.

[0029] Furthermore, the liquid cooling system 100, such as Figure 3 As shown, it also includes: A bypass pipe 80, one end of which is connected to the first self-priming pump 40 and the second solenoid valve 31 of the first circulation pipe 2, and the other end of which is connected between the third solenoid valve 32 of the second circulation pipe 5 and the cold plate 6. A fourth solenoid valve 33 is provided on the bypass pipe 80. When the first solenoid valve 30, the second solenoid valve 31, and the third solenoid valve 32 are open and the fourth solenoid valve 33 is closed, the liquid cooling system 100 operates in negative pressure mode.

[0030] To enable the liquid cooling system 100 to operate flexibly, the operating modes of the liquid cooling system 100 can be switched by setting the bypass pipe 80 and the fourth solenoid valve 33.

[0031] Optionally, when the first solenoid valve 30 and the fourth solenoid valve 33 are opened and the second solenoid valve 31 and the third solenoid valve 32 are closed, the liquid cooling system 100 operates in enhanced mode, and the coolant in the first circulation pipe 2 enters the second circulation pipe 5 through the bypass pipe 80 to dissipate heat from the cold plate 6.

[0032] When the liquid cooling system 100 is operating in negative pressure mode, since each self-priming pump maintains a cold liquid cycle, and the second self-priming pump 41 needs to draw cold liquid from the cold liquid cycle maintained by the first self-priming pump 40, the flow rate of cold liquid in the second circulation pipeline 5 will be limited.

[0033] When the heat in the device to be cooled is high, increasing the flow rate in the second circulation pipe 5 can improve the heat dissipation efficiency of the device. This can be achieved by first controlling the negative pressure generated by the second self-priming pump 41 to increase the flow rate of the coolant passing through the cold plate 6. However, due to the limitations of the negative pressure mode, the coolant flow rate is a bottleneck. At this time, the liquid cooling system 100 can close the second solenoid valve 31 and the third solenoid valve 32, open the first solenoid valve 30 and the fourth solenoid valve 33, and maintain the operation of the first self-priming pump 40 and the second self-priming pump 41, entering an enhanced mode. This enhanced mode is used to improve the heat dissipation efficiency of the liquid cooling system 100, that is, the coolant in the circulation pipe flows in the same direction under the action of the first self-priming pump 40 and the second self-priming pump 41 respectively, forming a flow pattern as shown in the image. Figure 4 The direction of the cold liquid flow is shown.

[0034] At this time, after the coolant flows out from the outlet 10, it flows through the first self-priming pump 40 to the side branch pipe 80, and then flows into the second circulation pipe 5 through the side branch pipe 80. Under the action of the second self-priming pump 41, it enters the cold plate 6 to dissipate heat from the heat dissipation equipment, and continues to cool down along the second circulation pipe 5 through the heat exchanger 7. Finally, it returns to the storage tank 1 through the second return port 12 to complete the circulation.

[0035] In the enhanced mode described above, the first self-priming pump 40 and the second self-priming pump 41 act on the coolant to make it flow faster and pass through the cold plate 6 at a faster speed, thereby improving the heat dissipation efficiency of the liquid cooling system 100 on the heat dissipation equipment.

[0036] Optional, liquid cooling system 100, such as Figure 3 As shown, it also includes: A first pressure sensor 90 is disposed on the inlet side of the cold plate 6 for detecting a first pressure value; and, The second pressure sensor 91 is disposed on the outlet side of the cold plate 6 and is used to detect the second pressure value; CDU (not shown) is electrically connected to the first pressure sensor 90 and the second pressure sensor 91, respectively; When the liquid cooling system 100 is operating in negative pressure mode, if the difference between the second pressure value and the first pressure value determined by the CDU is less than the pressure threshold, the CDU controls the liquid cooling system 100 to switch to enhanced mode.

[0037] In the liquid cooling system 100, the CDU acquires the first pressure value from the first pressure sensor 90 and the second pressure value from the second pressure sensor 91. A pressure threshold can be set, corresponding to the difference between the first and second pressure values, to determine whether the current flow rate of the coolant in the circulation pipeline meets expectations. If the difference is not less than the pressure threshold, the current flow rate is considered fast enough to meet the heat dissipation requirements, and the liquid cooling system's operating mode is maintained. If the difference is less than the pressure threshold, the current flow rate of the liquid cooling circulation is considered slow and needs to be increased. At this time, the CDU can control the switching of various solenoid valves as described above, switching the liquid cooling system 100 from negative pressure mode to enhanced mode, causing the first self-priming pump 40 and the second self-priming pump 41 to act on the coolant along the same circulation path, accelerating the coolant flow rate in the circulation and improving the heat dissipation efficiency of the liquid cooling system.

[0038] In addition, a working cycle can be set in the CDU. When switching to enhanced mode, the timer starts and the cooling of the equipment to be cooled is considered to be achieved after the timer reaches the working cycle. After switching from enhanced mode to negative pressure mode, the system continues to operate. By switching between negative pressure mode and enhanced mode, the liquid cooling system 100 can adapt to more changing situations, thereby improving the flexibility of the liquid cooling system.

[0039] Optionally, the liquid cooling system 100 also includes: The CDU is used to collect the temperature value of the device to be cooled. When the liquid cooling system 100 is operating in negative pressure mode, if the collected temperature value is greater than the temperature threshold, the CDU controls the liquid cooling system 100 to switch to enhanced mode.

[0040] In addition to determining the timing of mode switching of the coolant system 100 by using a pressure sensor as mentioned above, the timing of mode switching can also be confirmed by detecting the temperature of the heat dissipation equipment, thus allowing for more flexible heat dissipation control of the heat dissipation equipment.

[0041] A temperature threshold can also be set in the CDU. This temperature threshold is used to determine when the liquid cooling system 100 switches modes. The mode switch is performed when the collected temperature value is greater than the temperature threshold.

[0042] In addition, a working cycle can be set in the CDU. When switching to enhanced mode, the timer starts and after the timer reaches the working cycle, it is considered that the cooling of the equipment to be cooled has been achieved. Then, the system switches from enhanced mode to negative pressure mode to maintain operation.

[0043] In one possible implementation, the CDU obtains the temperature value of the heat-generating device in the device to be cooled via the BMC (Baseboard Management Controller) in the device to be cooled.

[0044] A network device can be configured with a BMC to manage it. The BMC can read the temperature values ​​recorded in heat-generating components such as processors. Since processors are generally considered to be the main heat-generating components in devices that need to be cooled, the temperature value can be used as a criterion. The BMC can send the temperature value to the CDU for judgment through external communication. If the temperature value is greater than the temperature threshold, the mode switching is triggered, i.e., switching from negative pressure mode to enhanced mode.

[0045] In another possible implementation, the liquid cooling system 100 further includes: A temperature sensor is installed in the device to be cooled and is electrically connected to the CDU, wherein the temperature value is acquired by the temperature sensor and transmitted to the CDU.

[0046] A temperature sensor can also be installed inside the device to be cooled. This temperature sensor is electrically connected to the CDU. After the temperature sensor detects a temperature value, it transmits it to the CDU, and the CDU makes a judgment to trigger the mode switching.

[0047] Optionally, a liquid cooling system 100, such as Figure 5 As shown, it also includes: The suction pipe 81 is provided with an air inlet 50 between the cold plate 6 and the second self-priming pump 41, and a fifth solenoid valve 34 is provided on the suction pipe 81. When the second solenoid valve 31, the third solenoid valve 32, and the fifth solenoid valve 34 are open and the first solenoid valve 30 and the fourth solenoid valve 33 are closed, the liquid cooling system 100 operates in recovery mode. Under the action of the first self-priming pump 40 and the second self-priming pump 41, the air drawn in from the suction pipe 81 pushes the coolant in the first circulation pipe 2 and the second circulation pipe 5 back into the liquid storage tank 1.

[0048] When maintenance is required on the liquid cooling system 100, the coolant in the circulation pipeline needs to be recovered to the storage tank 1. At this time, the liquid cooling system 100 can switch from negative pressure mode or enhanced mode to recovery mode, which can be achieved by receiving a recovery command through the CDU.

[0049] Taking CDU control as an example, after receiving a recovery command, the CDU can control the second solenoid valve 31, the third solenoid valve 32 and the fifth solenoid valve 34 to be opened, and control the first solenoid valve 30 and the fourth solenoid valve 33 to be closed. The intake pipe 81 can be connected to the outside.

[0050] When the first self-priming pump 40 and the second self-priming pump 41 are working, air can be drawn from the outside into the circulation pipeline. The air moves from the air inlet 50 to the side of the first self-priming pump 40 and the side of the second self-priming pump 41, respectively, thereby pushing the coolant in the circulation pipeline along the path such as... Figure 6 The liquid moves in the direction shown and eventually flows back to the storage tank 1 through the first return port 11 and the second return port 12.

[0051] The above settings enable the liquid cooling system 100 to have better maintainability.

[0052] Optionally, a liquid cooling system 100, such as Figure 7 As shown, it also includes: An exhaust valve 35 is installed on the second circulation pipeline 5 between the heat exchanger 7 and the second self-priming pump 41.

[0053] During the coolant circulation process, some air may be introduced into the circulation pipe. In order to avoid the increase of air causing blockage of the circulation pipe, especially at the cold plate 6, an exhaust valve 35 can be added to the second circulation pipe 5 and set to open periodically to discharge the air carried by the coolant in the second circulation pipe 5, thereby improving the reliability of the liquid cooling system.

[0054] Optionally, the heat exchanger 7 can be an air-cooled heat exchanger or a liquid-cooled heat exchanger, depending on actual needs.

[0055] The technical solutions provided in the embodiments of this specification may include the following beneficial effects: In this embodiment, the liquid cooling system includes a first circulation pipeline and a second circulation pipeline. A first self-priming pump is installed on the first circulation pipeline, and a second self-priming pump is installed on the second circulation pipeline. When the first self-priming pump is running, the coolant circulates in the storage tank and the first circulation pipeline. The second self-priming pump, with a pressure at its inlet greater than that of the first self-priming pump, draws the coolant circulating in the first circulation pipeline into the second circulation pipeline from the distributor port. The coolant is then cooled by a cooling plate installed in the second circulation pipeline. Because a negative pressure circulation is formed between the first and second circulation pipelines, the leakage and dripping of coolant from the connection points of the circulation pipelines are reduced, thus improving the reliability of the liquid cooling system in cooling electronic equipment.

[0056] Other embodiments of this specification will readily occur to those skilled in the art upon consideration of the specification and practice of the invention claimed herein. This specification is intended to cover any variations, uses, or adaptations that follow the general principles of this specification and include common knowledge or customary techniques in the art not claimed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this specification are indicated by the following claims.

[0057] It should be understood that this specification is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this specification is limited only by the appended claims.

[0058] The above description is merely a preferred embodiment of this specification and is not intended to limit this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this specification should be included within the scope of protection of this specification.

Claims

1. A liquid cooling system, characterized in that, include: liquid storage tank; The first circulation pipeline is connected to the outlet and the first return port of the liquid storage tank respectively. A first solenoid valve, a first self-priming pump and a second solenoid valve are sequentially arranged from the outlet to the first return port. The second circulation pipeline is connected to the liquid distribution port on the first circulation pipeline and the second return port of the liquid storage tank. A third solenoid valve, a cold plate, a second self-priming pump and a heat exchanger are arranged sequentially from the liquid distribution port to the second return port. The liquid distribution port is formed on the first circulation pipeline between the first solenoid valve and the first self-priming pump. The cold plate is arranged in the equipment to be cooled. When the liquid cooling system operates in negative pressure mode, the negative pressure generated by the first self-priming pump is less than the negative pressure generated by the second self-priming pump. The circulating coolant in the first circulation pipeline is drawn into the second circulation pipeline from the liquid distributor to dissipate heat from the cold plate.

2. The liquid cooling system according to claim 1, characterized in that, Also includes: A bypass pipeline, one end of which is connected to the first self-priming pump and the second solenoid valve of the first circulation pipeline, and the other end of which is connected between the third solenoid valve of the second circulation pipeline and the cold plate. A fourth solenoid valve is provided on the bypass pipeline. When the first solenoid valve, the second solenoid valve, and the third solenoid valve are open and the fourth solenoid valve is closed, the liquid cooling system operates in negative pressure mode.

3. The liquid cooling system according to claim 2, characterized in that, When the first and fourth solenoid valves are open and the second and third solenoid valves are closed, the liquid cooling system operates in enhanced mode, and the coolant in the first circulation pipeline enters the second circulation pipeline through the bypass pipeline to dissipate heat from the cold plate.

4. The liquid cooling system according to claim 3, characterized in that, Also includes: A first pressure sensor is installed on the inlet side of the cold plate to detect a first pressure value; as well as, A second pressure sensor is located on the outlet side of the cold plate to detect a second pressure value. The cooling capacity distribution unit (CDU) is electrically connected to the first pressure sensor and the second pressure sensor, respectively. When the liquid cooling system is operating in negative pressure mode, if the difference between the second pressure value and the first pressure value determined by the CDU is less than the pressure threshold, the CDU controls the liquid cooling system to switch to enhanced mode.

5. The liquid cooling system according to claim 3, characterized in that, Also includes: CDU is used to collect the temperature value of the device to be cooled. When the liquid cooling system is operating in negative pressure mode, if the collected temperature value is greater than the temperature threshold, the CDU controls the liquid cooling system to switch to enhanced mode.

6. The liquid cooling system according to claim 5, characterized in that, The CDU obtains the temperature value of the heat-generating device in the heat-generating device through the baseboard management controller (BMC) in the heat-generating device.

7. The liquid cooling system according to claim 5, characterized in that, Also includes: A temperature sensor is installed in the device to be cooled and is electrically connected to the CDU, wherein the temperature value is acquired by the temperature sensor and transmitted to the CDU.

8. The liquid cooling system according to claim 2, characterized in that, Also includes: An air intake pipe is provided at the air inlet between the cold plate and the second self-priming pump, and a fifth solenoid valve is provided on the air intake pipe. When the second, third, and fifth solenoid valves are open and the first and fourth solenoid valves are closed, the liquid cooling system operates in recovery mode. Under the action of the first and second self-priming pumps, the air drawn in from the suction line pushes the coolant in the first and second circulation lines back into the storage tank.

9. The liquid cooling system according to any one of claims 1-8, characterized in that, Also includes: An exhaust valve is installed on the second circulation pipeline between the heat exchanger and the second self-priming pump.

10. The liquid cooling system according to any one of claims 1-8, characterized in that, The heat exchanger is either an air-cooled heat exchanger or a liquid-cooled heat exchanger.

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