A liquid cooling system

Abstract

The utility model discloses a liquid cooling system, including plate heat exchanger, control device and respectively with control device electricity connection primary side, secondary side and system fluctuation detection mechanism, and primary side realizes heat exchange with secondary side through plate heat exchanger, secondary side includes respectively with control device electricity connection pumping mechanism, expansion tank, solenoid valve and liquid supplement unit, and expansion tank and pumping mechanism arrange and set along the cooling liquid input direction of secondary side in proper order, and the output of liquid supplement unit is connected with the input of expansion tank through solenoid valve, the liquid cooling system of the application, through the linkage of liquid supplement unit and solenoid valve, constructs dynamic pressure compensation structure, replaces the physical expansion means of traditional redundant volume expansion tank, with the aid of dynamic pressure compensation structure, the volume of expansion tank is significantly reduced, and the strict requirement of compactness of rack type CDU etc. scene is fully satisfied, and the pipeline damage possibly caused by pressure overrun or deficiency is effectively avoided.

Description

Technical Field

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

[0002] As a core component of data center temperature control, the compactness and pressure stability of liquid cooling systems directly impact equipment adaptability and operational safety.

[0003] In existing liquid cooling systems, redundant volume expansion tanks are commonly used to cope with volume fluctuations in the coolant caused by environmental changes such as temperature and altitude. The principle of this design is to absorb changes in coolant volume by increasing the physical volume of the expansion tank, thereby maintaining the system pressure of the liquid cooling system.

[0004] However, this design of redundant volumetric expansion tanks has many drawbacks:

[0005] Firstly, in scenarios with extremely stringent space requirements, such as rack-mounted CDUs, redundant volume increases the size of the expansion tank, making the overall structure of the liquid cooling system bulky. Since rack-mounted CDUs require equipment to be arranged closely, and the size of the redundant expansion tank exceeds the limitations of integrated design, this design is not applicable in such scenarios.

[0006] Secondly, fixed-volume expansion tanks cannot be adapted to environmental changes throughout their entire life cycle through structural optimization; when the ambient temperature fluctuates drastically, the redundant volume may be insufficient or excessive; this will lead to unstable system pressure, which in turn will affect the service life of components such as pipelines and pump sets.

[0007] Third, large-capacity expansion tanks not only require additional space and increase material costs, but their installation location also limits the overall layout flexibility of the liquid cooling system, which is not conducive to modular design.

[0008] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0009] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a liquid cooling system with the advantages of compact structure, stable pressure and strong adaptability. It can achieve stable pressure throughout the entire life cycle without relying on redundant volume expansion tanks, and meets the structural requirements of integrated scenarios such as rack-mounted CDUs.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A liquid cooling system includes a plate heat exchanger, a control device, and a primary side, a secondary side, and a system fluctuation detection mechanism, all electrically connected to the control device. The primary side is used to connect to external refrigeration equipment, and heat exchange is achieved between the primary side and the secondary side through the plate heat exchanger. The secondary side is used to connect to a server to be cooled. The secondary side includes a pumping mechanism, an expansion tank, a solenoid valve, and a liquid replenishment unit, all electrically connected to the control device. The expansion tank and the pumping mechanism are arranged sequentially along the coolant input direction of the secondary side. The output end of the liquid replenishment unit is connected to the input end of the expansion tank through the solenoid valve.

[0012] In the liquid cooling system, the system fluctuation detection mechanism includes an ambient temperature and humidity sensor, a second pressure sensor, and a second temperature sensor, which are electrically connected to the control device. The ambient temperature and humidity sensor is used to acquire the temperature and humidity of the environment in which the liquid cooling system is located. The second pressure sensor and the second temperature sensor are respectively located at the input end of the secondary side to acquire the input pressure and input temperature of the secondary side.

[0013] In the liquid cooling system, the pumping mechanism includes a first pump group and a second pump group arranged in parallel. The first pump group and the second pump group have the same structure, and the output end of the expansion tank is connected to the input end of the first pump group and the input end of the second pump group, respectively.

[0014] In the liquid cooling system, the first pump group includes a circulating pump and two check valves. The two check valves are respectively located at the input end and the output end of the circulating pump. The output end of the expansion tank is connected to the input end of the check valve located at the input end of the circulating pump. The circulating pump is electrically connected to the control device.

[0015] In the liquid cooling system, the replenishment unit includes a replenishment pump and a replenishment tank. The replenishment tank is connected to the input terminal of the solenoid valve through the replenishment pump. The replenishment pump is electrically connected to the control device.

[0016] In the liquid cooling system, the secondary side further includes a third pressure sensor, a first temperature sensor, and a first pressure sensor, which are electrically connected to the control device respectively; the third pressure sensor is disposed at the output end of the pumping mechanism, and the first temperature sensor and the first pressure sensor are disposed at the output end of the secondary side respectively.

[0017] In the liquid cooling system, the secondary side also includes a safety valve, which is located at the secondary output end of the plate heat exchanger.

[0018] In the liquid cooling system, the primary side includes a fourth temperature sensor, a fourth pressure sensor, a fifth temperature sensor, and a fifth pressure sensor, which are electrically connected to the control device respectively; the fourth pressure sensor and the fourth temperature sensor are disposed at the input end of the primary side, and the fifth pressure sensor and the fifth temperature sensor are disposed at the output end of the primary side.

[0019] In the liquid cooling system, the primary side further includes a switching valve electrically connected to the control device, and the switching valve is located at the input end of the primary side.

[0020] Beneficial effects:

[0021] This invention provides a liquid cooling system that uses a dynamic pressure compensation structure by linking a liquid replenishment unit with a solenoid valve. Under this structure, the liquid cooling system can use a smaller expansion tank. By flexibly adjusting the opening and closing of the solenoid valve, the liquid flow state can be changed, thereby achieving the goal of actively balancing pressure. This replaces the traditional physical expansion method of redundant volume expansion tanks. With the help of the dynamic pressure compensation structure, the volume of the expansion tank is significantly reduced, fully meeting the stringent compactness requirements of rack-mounted CDUs and other scenarios, while effectively avoiding pipeline damage that may be caused by excessive or insufficient pressure. Attached Figure Description

[0022] Figure 1 The system schematic diagram of the liquid cooling system provided by this utility model.

[0023] Explanation of key component symbols: 1-Ambient temperature and humidity sensor, 21-Circulation pump, 22-Check valve, 31-Expansion tank, 32-Solenoid valve, 33-Replenishment pump, 34-Replenishment tank, 41-Second pressure sensor, 42-Second temperature sensor, 43-Third pressure sensor, 44-First pressure sensor, 45-First temperature sensor, 5-Safety valve, 6-Plate heat exchanger, 71-Fourth pressure sensor, 72-Fourth temperature sensor, 73-Fifth temperature sensor, 74-Fifth pressure sensor, 8-Switch valve. Detailed Implementation

[0024] This utility model provides a liquid cooling system. To make the purpose, technical solution and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments.

[0025] In the description of this utility model, it should be understood that the terms "installation" and "connection" should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Please see Figure 1This utility model provides a liquid cooling system, including a plate heat exchanger 6, a control device, and a primary side, a secondary side, and a system fluctuation detection mechanism, all electrically connected to the control device. The primary side is used to connect to external refrigeration equipment, and the primary side and the secondary side exchange heat through the plate heat exchanger 6. The secondary side is used to connect to a server to be cooled. The secondary side includes a pumping mechanism, an expansion tank 31, a solenoid valve 32, and a liquid replenishment unit, all electrically connected to the control device. The expansion tank 31 and the pumping mechanism are arranged sequentially along the coolant input direction of the secondary side. The output end of the liquid replenishment unit is connected to the input end of the expansion tank 31 through the solenoid valve 32.

[0027] This utility model discloses a liquid cooling system. By linking the liquid replenishment unit with the solenoid valve 32, a dynamic pressure compensation structure is constructed. Under this structure, the liquid cooling system can use a smaller volume expansion tank 31. By flexibly adjusting the opening and closing of the solenoid valve 32, the liquid flow state is changed, thereby achieving the goal of actively balancing pressure. This replaces the traditional physical expansion method of redundant volume expansion tank 31. With the help of the dynamic pressure compensation structure, the volume of expansion tank 31 is significantly reduced, which fully meets the stringent compactness requirements of rack-mounted CDU and other scenarios, while effectively avoiding pipeline damage that may be caused by excessive or insufficient pressure.

[0028] In this embodiment, the closed-loop control of the system fluctuation detection mechanism and the control device can sense environmental parameters and the working status of the liquid cooling system in real time. When temperature fluctuations or pressure fluctuations are detected, the control device compensates for the coolant volume by controlling the opening and closing of the solenoid valve 32, thereby achieving dynamic balance of the system pressure of the liquid cooling system. The control device can be an embedded microcontroller, such as an STM32 series microcontroller.

[0029] Furthermore, the system fluctuation detection mechanism includes an ambient temperature and humidity sensor 1, a second pressure sensor 41, and a second temperature sensor 42, which are electrically connected to the control device respectively. The ambient temperature and humidity sensor 1 is used to acquire the temperature and humidity of the environment in which the liquid cooling system is located. The second pressure sensor 41 and the second temperature sensor 42 are respectively disposed at the input end of the secondary side to acquire the input side pressure and input side temperature of the secondary side.

[0030] In this embodiment, the system pressure fluctuation is confirmed based on the real-time input pressure fed back by the second pressure sensor 41, and the system temperature difference is confirmed based on the real-time ambient temperature fed back by the ambient temperature and humidity sensor 1 and the real-time input temperature fed back by the second temperature sensor 42. When the system fluctuation detection mechanism reports high liquid cooling system pressure and large temperature difference, it means that the system pressure of the liquid cooling system exceeds the expected range due to factors such as coolant volume expansion. In this case, the solenoid valve 32 is opened, with its opening duration set to 3-7 seconds, to provide an additional flow channel for the coolant, allowing some coolant to flow through this channel, such as returning to the replenishment tank 34, thereby reducing the system pressure and balancing the pressure surge caused by the temperature increase. When the system fluctuation detection mechanism indicates that the system pressure of the liquid cooling system is low, the solenoid valve 32 is also opened, but the opening duration is adjusted to 1-4 seconds. The system pressure is adjusted by controlling the flow of coolant to cope with the low temperature and volume contraction.

[0031] In this embodiment, the solenoid valve 32 can react quickly to real-time changes in system pressure, opening or closing in a very short time to achieve rapid adjustment of system pressure. This rapid response capability is of vital importance in dealing with sudden pressure fluctuations during system operation, such as instantaneous changes in coolant temperature and pressure caused by sudden changes in equipment load. By adjusting the opening and closing of the solenoid valve 32, the system pressure can be stabilized in a timely manner, ensuring the normal operation of the equipment to be cooled and keeping the system pressure within a preset reasonable range, thereby significantly improving the operational stability and reliability of the liquid cooling system.

[0032] In this embodiment, when the expansion tank 31 is applied to the liquid cooling system, its working principle is based on the thermal expansion and contraction characteristics of the coolant. During the operation of the liquid cooling system, if the coolant expands in volume due to the increase in temperature, some of the coolant will flow into the expansion tank 31, causing the pressure inside the expansion tank 31 to increase, while the system pressure is buffered. Conversely, when the coolant contracts in volume due to the decrease in temperature, the coolant in the expansion tank 31 flows back into the system under the action of the pressure difference, replenishing the insufficient coolant in the system and maintaining the stability of the system pressure. The expansion tank 31 is usually equipped with a structure such as an elastic diaphragm or air bladder to isolate the coolant inside the tank from the outside air or other gases, preventing the coolant from being contaminated or oxidized, while improving the efficiency and stability of pressure buffering.

[0033] In this embodiment, by employing a dynamic pressure compensation structure in the liquid cooling system, the selection of the expansion tank 31 eliminates the reliance on traditional redundant volume design. Based on the actual operating conditions and pressure regulation requirements of the liquid cooling system, a small-volume expansion tank 31 can be selected. In some extreme optimization scenarios, if the liquid cooling system pressure can be effectively stabilized through the linkage of the solenoid valve 32 and the replenishment unit, the expansion tank 31 may not even be necessary. For example, in small liquid cooling devices where space requirements are extremely stringent and system operating conditions are relatively stable, the expansion tank 31 can be omitted, and the changes in coolant volume can be addressed through the coordinated operation of components such as the solenoid valve 32, the pumping mechanism, and the replenishment unit. Small volume... The design of expansion tank 31 or without expansion tank 31 greatly saves installation space for liquid cooling systems, making it particularly suitable for applications with strict space requirements, such as compact data center cabinets and liquid cooling modules for distributed energy storage systems. This space optimization not only facilitates the integrated design of the equipment but also reduces the overall size and weight of the equipment, making transportation and installation more convenient. Reducing the volume requirement of expansion tank 31 or eliminating expansion tank 31 directly reduces the material and manufacturing costs of the equipment. At the same time, the system pressure regulation of the liquid cooling system becomes more efficient, reducing damage to other components caused by unstable pressure, lowering maintenance costs, and further improving the economic benefits of the liquid cooling system.

[0034] In this embodiment, the expansion tank 31 works in conjunction with the system's dynamic pressure compensation structure. When a pressure change is detected by the second pressure sensor 41, the solenoid valve 32 is activated for rapid pressure regulation. Simultaneously, the expansion tank 31, acting as an auxiliary pressure buffer, absorbs or releases coolant to further stabilize the system pressure. For example, in the event of a sudden increase in system pressure, the solenoid valve 32 opens rapidly to release pressure, while the expansion tank 31 absorbs some of the expanded coolant, sharing the pressure regulation load. During slow pressure changes, the expansion tank 31 continuously plays its buffering role, making system pressure changes more stable and reducing the pressure regulation burden on other components. Through the coordinated operation of the expansion tank 31 and the dynamic pressure compensation structure, the system's ability to cope with pressure changes is enhanced, making the system pressure more stable. Stable system pressure helps improve the coolant circulation efficiency, ensuring that the cooling effect on the equipment is always maintained at its optimal state, extending the equipment's service life, and improving the reliability and stability of the liquid cooling system during operation.

[0035] Furthermore, the pumping mechanism includes a first pump group and a second pump group arranged in parallel. The first pump group and the second pump group have the same structure, and the output end of the expansion tank 31 is connected to the input end of the first pump group and the input end of the second pump group, respectively.

[0036] In this embodiment, a dual-pump redundancy design is adopted, with two pump sets connected in parallel in the secondary circulation loop. This greatly improves the reliability of the liquid cooling system. Even if one circulation pump 21 fails, the other circulation pump 21 can immediately and seamlessly switch to operation, ensuring uninterrupted coolant circulation and thus guaranteeing continuous cooling of the equipment. This is of paramount importance for applications with extremely high heat dissipation requirements that cannot tolerate any cooling interruption, such as critical heat dissipation systems in large data centers and medical equipment. It can effectively prevent serious consequences such as equipment damage or data loss due to heat dissipation interruption.

[0037] In this embodiment, check valves 22 are installed in series at both the inlet and outlet ends of the pump set. The structure of the check valves 22 allows only unidirectional flow of coolant. When the main pump is running, the coolant flows forward through the check valves 22 under the push of the circulating pump 21. When the main pump stops due to failure or the pump set is switched, the check valves 22 can close quickly, effectively preventing coolant backflow. This design ensures the independence and stability of the circuit when a single pump is running, avoids damage to the pump set and other components caused by coolant backflow, and provides a basic guarantee for system pressure stability. Stable fluid flow helps maintain the normal working state of each component in the liquid cooling system, reduces additional losses caused by fluid turbulence, and thus extends the overall service life of the liquid cooling system.

[0038] Furthermore, the first pump set includes a circulation pump 21 and two check valves 22. The two check valves 22 are respectively disposed at the input end and the output end of the circulation pump 21. The output end of the expansion tank 31 is connected to the input end of the check valve 22 located at the input end of the circulation pump 21. The circulation pump 21 is electrically connected to the control device.

[0039] Furthermore, the replenishment unit includes a replenishment pump 33 and a replenishment tank 34. The replenishment tank 34 is connected to the input terminal of the solenoid valve 32 through the replenishment pump 33. The replenishment pump 33 is electrically connected to the control device.

[0040] In this embodiment, the replenishment tank 34 is used to store a certain amount of coolant, and its volume is reasonably designed according to the scale of the liquid cooling system and possible replenishment needs. The replenishment pump 33 and the solenoid valve 32 are connected between the replenishment tank 34 and the secondary circulation loop of the liquid cooling system. The replenishment pump 33 is usually a corrosion-resistant, low-flow, high-pressure pump to ensure that the coolant in the replenishment tank 34 can be accurately replenished to the liquid cooling system when needed. The materials of the replenishment pump 33 and the replenishment tank 34 are selected to be compatible with the coolant to prevent the coolant from corroding them and affecting their service life and replenishment effect.

[0041] In this embodiment, when the second pressure sensor 41 detects that the system pressure is too low and the pressure cannot be restored to the normal range by adjusting the solenoid valve 32, a liquid replenishment operation is required. At this time, the control device sends a start signal to the liquid replenishment pump 33, and the liquid replenishment pump 33 starts to work, pumping the coolant in the liquid replenishment tank 34 into the secondary side circulation loop. When the input pressure on the secondary side is restored to the normal range, the liquid replenishment pump 33 stops working.

[0042] Furthermore, the secondary side also includes a third pressure sensor 43, a first temperature sensor 45, and a first pressure sensor 44, which are electrically connected to the control device respectively; the third pressure sensor 43 is disposed at the output end of the pumping mechanism, and the first temperature sensor 45 and the first pressure sensor 44 are respectively disposed at the output end of the secondary side.

[0043] Furthermore, the primary side includes a fourth temperature sensor 72, a fourth pressure sensor 71, a fifth temperature sensor 73, and a fifth pressure sensor 74, which are electrically connected to the control device respectively; the fourth pressure sensor 71 and the fourth temperature sensor 72 are disposed at the input end of the primary side, and the fifth pressure sensor 74 and the fifth temperature sensor 73 are disposed at the output end of the primary side.

[0044] In this embodiment, a first pressure sensor 44, a second pressure sensor 41, and a third pressure sensor 43 are respectively arranged in the secondary circulation loop of the liquid cooling system to monitor the pressure at different locations. The second pressure sensor 41 is located at a critical position and is used to monitor the main operating pressure of the liquid cooling system in real time. The first pressure sensor 44 and the third pressure sensor 43 are used to monitor the pressure of other key nodes, such as the inlet and outlet pressures of the pump group. By monitoring the pressure at multiple locations, the pressure distribution of the entire secondary circulation loop can be fully understood. In the primary circulation loop, a fourth pressure sensor 71 and a fifth pressure sensor 74 are also set to monitor the pressure of the primary cooling medium in order to grasp the operating status of the primary system and provide data support for heat exchange and pressure balance between the primary and secondary sides.

[0045] In this embodiment, the first temperature sensor 45 and the second temperature sensor 42 are used to monitor the temperature of the secondary side coolant. The first temperature sensor 45 can be installed in the pipeline before the coolant enters the equipment to be cooled to monitor the initial temperature of the coolant. The second temperature sensor 42 is installed in the pipeline after the coolant flows out of the equipment to be cooled to monitor the temperature of the coolant after absorbing heat. In the primary side circulation loop, the fourth temperature sensor 72 and the fifth temperature sensor 73 monitor the temperature of the primary side cooling medium to control the flow rate and temperature of the primary side cooling medium in order to achieve efficient heat exchange with the secondary side coolant.

[0046] In this embodiment, multiple sensors are rationally arranged and work together to monitor the overall operating status of key parameters such as pressure, temperature, humidity, and temperature and humidity of the liquid cooling system. The comprehensive monitoring data allows the control device to understand the operating status of the liquid cooling system in a timely and accurate manner, laying a solid data foundation for the opening and closing control of the solenoid valve 32. In addition, based on the correlation between the data of different sensors, faults can be quickly diagnosed, the location and cause of the fault can be determined, providing strong support for timely maintenance, reducing equipment downtime, and improving the reliability and availability of the liquid cooling system.

[0047] Furthermore, the secondary side also includes a safety valve 5, which is located at the secondary side output end of the plate heat exchanger 6.

[0048] In this embodiment, during the operation of the liquid cooling system, various factors may cause the system pressure to rise abnormally. For example, a sudden increase in coolant temperature may cause a significant expansion in its volume; pump failure may lead to excessive flow and uncontrolled pressure; failure of control components such as solenoid valve 32 may also cause the pressure to be unable to be regulated normally. When the system pressure exceeds the preset opening pressure threshold of safety valve 5, safety valve 5 will automatically activate to discharge excess coolant or release some pressure, thereby preventing the system pressure of the liquid cooling system from rising continuously. This effectively avoids damage to system pipelines, joints, pumps, expansion tank 31 and other components caused by excessive pressure, reduces the risk of leakage and rupture, ensures the integrity of the system hardware, and extends the service life of each component.

[0049] Furthermore, the primary side also includes a switching valve 8 electrically connected to the control device, the switching valve 8 being disposed at the input end of the primary side.

[0050] In this embodiment, the primary-side switching valve 8 can precisely control the flow rate of the cooling medium flowing into the plate heat exchanger 6 by adjusting its opening degree. When the secondary-side coolant temperature rises, such as when the server load increases, the switching valve 8 increases its opening degree, increasing the primary-side medium flow rate, improving the heat exchange rate with the secondary side, and quickly reducing the secondary-side temperature. When the secondary-side temperature decreases, such as when the server load decreases, the switching valve 8 decreases its opening degree, reducing the primary-side medium flow rate and avoiding energy waste. By adjusting the opening degree of the switching valve 8, it is ensured that the heat exchange between the primary and secondary sides always matches the actual heat dissipation requirements, significantly improving the energy efficiency of the liquid cooling system.

[0051] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of this utility model.

Claims

1. A liquid cooling system, characterized by, The system includes a plate heat exchanger, a control device, and a primary side, a secondary side, and a system fluctuation detection mechanism, all electrically connected to the control device. The primary side is used to connect to external refrigeration equipment, and heat exchange is achieved between the primary side and the secondary side through the plate heat exchanger. The secondary side is used to connect to a server to be cooled. The secondary side includes a pumping mechanism, an expansion tank, a solenoid valve, and a liquid replenishment unit, all electrically connected to the control device. The expansion tank and the pumping mechanism are arranged sequentially along the coolant input direction of the secondary side. The output end of the liquid replenishment unit is connected to the input end of the expansion tank through the solenoid valve.

2. The liquid cooling system of claim 1, wherein, The system fluctuation detection mechanism includes an ambient temperature and humidity sensor, a second pressure sensor, and a second temperature sensor, which are electrically connected to the control device. The ambient temperature and humidity sensor is used to acquire the temperature and humidity of the environment in which the liquid cooling system is located. The second pressure sensor and the second temperature sensor are respectively located at the input end of the secondary side and are used to acquire the input pressure and input temperature of the secondary side.

3. The liquid cooling system of claim 1, wherein, The pumping mechanism includes a first pump group and a second pump group arranged in parallel. The first pump group and the second pump group have the same structure. The output end of the expansion tank is connected to the input end of the first pump group and the input end of the second pump group, respectively.

4. The liquid cooling system of claim 3, wherein, The first pump set includes a circulating pump and two check valves. The two check valves are respectively located at the input end and the output end of the circulating pump. The output end of the expansion tank is connected to the input end of the check valve located at the input end of the circulating pump. The circulating pump is electrically connected to the control device.

5. The liquid cooling system of claim 1, wherein, The replenishment unit includes a replenishment pump and a replenishment tank. The replenishment tank is connected to the input terminal of the solenoid valve through the replenishment pump. The replenishment pump is electrically connected to the control device.

6. The liquid cooling system of claim 1, wherein, The secondary side also includes a third pressure sensor, a first temperature sensor, and a first pressure sensor, which are electrically connected to the control device respectively; the third pressure sensor is disposed at the output end of the pumping mechanism, and the first temperature sensor and the first pressure sensor are disposed at the output end of the secondary side respectively.

7. The liquid cooling system of claim 1, wherein, The secondary side also includes a safety valve, which is located at the secondary side output end of the plate heat exchanger.

8. The liquid cooling system of claim 1, wherein, The primary side includes a fourth temperature sensor, a fourth pressure sensor, a fifth temperature sensor, and a fifth pressure sensor, which are electrically connected to the control device respectively; the fourth pressure sensor and the fourth temperature sensor are disposed at the input terminal of the primary side, and the fifth pressure sensor and the fifth temperature sensor are disposed at the output terminal of the primary side.

9. The liquid cooling system of claim 8, wherein, The primary side also includes a switching valve electrically connected to the control device, and the switching valve is located at the input end of the primary side.

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