Control device of liquid cooling system and liquid cooling system

Abstract

The invention discloses a liquid cooling system and a control device thereof. The control device comprises a loop water supply connector, a cabinet water supply connector, a loop water return connector, a cabinet water return connector, a liquid storage tank, a power pump, an electric valve, a liquid supply flow sensor, a liquid return flow sensor and a control unit. The liquid storage tank is connected with the cabinet water supply connector through a first pipeline, and the power pump, the electric valve and the liquid supply flow sensor are all arranged on the first pipeline. The loop water return connector and the cabinet water return connector are connected through a second pipeline, and the liquid return flow sensor is arranged on the second pipeline. The control unit is configured to control the electric valve and the power pump to be closed when the liquid supply flow detected by the liquid supply flow sensor and the liquid return flow detected by the liquid return flow sensor meet a first preset condition. The control device of the liquid cooling system and the liquid cooling system provided by the embodiment of the invention are deployed in a single liquid cooling cabinet, and cabinet-level liquid leakage monitoring and automatic isolation functions are realized by monitoring the flow of the cooling liquid.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid-cooled server, and particularly relates to a control device of a liquid cooling system and the liquid cooling system. BACKGROUND

[0002] In order to realize energy saving and emission reduction, and promote the construction of green and energy-saving data centers, the technical solution of liquid-cooled server products has become the first choice in the industry, especially the plate exchange type liquid-cooled server technology, which not only realizes accurate refrigeration of heat generating devices such as processors and memories, but also greatly improves the energy consumption level and installation capacity of data centers.

[0003] At present, the liquid-cooled server product technology is in a rapid growth period, and the relatively mature product architecture adopts centralized liquid cooling heat exchange units (CDU) and other heat exchange equipment to realize the isolation and heat exchange of the primary side and the secondary side pipelines.

[0004] Based on the above liquid-cooled product architecture, the secondary circulation pipeline, the liquid-cooled cabinet, the server and other components belong to the same fault domain. When the secondary circulation pipeline, the liquid-cooled cabinet, the server and other components have the problems of liquid leakage and liquid seepage, the normal operation of the entire computer room module will be affected, and the risk of business interruption will be caused.

[0005] Based on the above technical problems, the current mainstream liquid leakage monitoring mechanism of liquid-cooled equipment relies on a liquid leakage detection rope. The liquid leakage detection rope is physically deployed and wound in specific components such as the main pipeline, the bottom of the cabinet and the case. It cannot provide effective monitoring for high-risk parts such as pipe joints and valves. In addition, air dust and humidity will interfere with the liquid leakage detection rope, and there are problems such as incomplete monitoring coverage and inaccurate monitoring.

[0006] For cooling liquid with a flow rate of 10L / min, the above monitoring mechanism cannot accurately isolate the risk of liquid leakage, and emergency recovery often needs to rely on manual intervention, which is easy to cause a large amount of liquid leakage of the cooling liquid, increase the risk of business interruption and high asset loss. SUMMARY

[0007] The present application provides a control device of a liquid cooling system and the liquid cooling system to realize accurate detection of liquid leakage and liquid seepage, and quickly isolate the emergency leakage point, reduce the fault influence range, and improve the overall reliability and operation efficiency of the liquid cooling system.

[0008] According to an aspect of the present application, a control device of a liquid cooling system is provided, the liquid cooling system comprising a liquid-cooled cabinet, the liquid-cooled cabinet comprising a liquid cooling heat exchange unit;

[0009] The control device comprises a loop water supply interface, a cabinet water supply interface, a loop water return interface, a cabinet water return interface, a liquid storage tank, a power pump, an electric valve, a liquid supply flow sensor, a liquid return flow sensor and a control unit;

[0010] The loop water supply interface is connected with the liquid storage tank, the liquid storage tank is connected with the cabinet water supply interface through a first pipeline, and the power pump, the electric valve and the liquid supply flow sensor are arranged on the first pipeline;

[0011] The loop water return interface and the cabinet water return interface are connected through a second pipeline, and the liquid return flow sensor is arranged on the second pipeline;

[0012] The loop water supply interface and the cabinet water supply interface are connected with the liquid supply pipeline of the liquid cooling heat exchange unit, and the cabinet water return interface and the loop water return interface are connected with the liquid return pipeline of the liquid cooling heat exchange unit;

[0013] The liquid supply flow sensor, the liquid return flow sensor, the power pump and the electric valve are in communication connection with the control unit, and the control unit is configured to control the electric valve and the power pump to be closed when the liquid supply flow detected by the liquid supply flow sensor and the liquid return flow detected by the liquid return flow sensor satisfy a first preset condition.

[0014] Optionally, the first preset condition comprises that a difference between the liquid supply flow detected by the liquid supply flow sensor and the liquid return flow detected by the liquid return flow sensor is greater than or equal to a first flow threshold value.

[0015] Optionally, a liquid supply pressure sensor arranged on the first pipeline and a liquid return pressure sensor arranged on the second pipeline are further included;

[0016] The liquid supply pressure sensor and the liquid return pressure sensor are in communication connection with the control unit;

[0017] The first preset condition comprises that a difference between the liquid supply flow detected by the liquid supply flow sensor and the liquid return flow detected by the liquid return flow sensor is greater than or equal to a first flow threshold value, and a difference between the liquid supply pressure detected by the liquid supply pressure sensor and the liquid return pressure detected by the liquid return pressure sensor is greater than or equal to a first pressure threshold value.

[0018] Optionally, an output module in communication connection with the control unit is further included;

[0019] The control unit is further configured to send first alarm information through the output module when a difference between the liquid supply flow detected by the liquid supply flow sensor and the liquid return flow detected by the liquid return flow sensor is greater than or equal to a second flow threshold value;

[0020] The second flow threshold is less than the first flow threshold.

[0021] Optionally, a return liquid temperature sensor is further arranged on the second pipeline;

[0022] The return liquid temperature sensor is in communication connection with the control unit;

[0023] The control unit is configured to increase the rotating speed of the power pump when the return liquid temperature detected by the return liquid temperature sensor is greater than a first temperature threshold, and decrease the rotating speed of the power pump when the return liquid temperature detected by the return liquid temperature sensor is less than the first temperature threshold.

[0024] Optionally, a return liquid temperature sensor is further arranged on the second pipeline;

[0025] The return liquid temperature sensor is in communication connection with the control unit;

[0026] The control unit is configured to determine a target opening degree of the electric valve when the return liquid temperature detected by the return liquid temperature sensor is greater than or less than a first temperature threshold, and adjust the opening degree of the electric valve to the target opening degree.

[0027] Optionally, the target opening degree is greater than the current opening degree of the electric valve when the return liquid temperature detected by the return liquid temperature sensor is greater than a first temperature threshold, and the target opening degree is less than the current opening degree of the electric valve when the return liquid temperature detected by the return liquid temperature sensor is less than the first temperature threshold.

[0028] Optionally, the opening degree of the electric valve is adjusted to the target opening degree when the target opening degree is less than or equal to a preset maximum opening degree;

[0029] The opening degree of the electric valve is adjusted to the preset maximum opening degree when the target opening degree is greater than the preset maximum opening degree.

[0030] Optionally, a supply liquid temperature sensor arranged on the first pipeline, a return liquid temperature sensor arranged on the second pipeline, and an output module in communication connection with the control unit are further included;

[0031] The supply liquid temperature sensor and the return liquid temperature sensor are both in communication connection with the control unit;

[0032] The control unit is further configured to determine the heat load of the liquid cooling cabinet based on the supply liquid temperature detected by the supply liquid temperature sensor and the return liquid temperature detected by the return liquid temperature sensor, and send a second alarm information through the output module when the heat load is less than a first heat load threshold.

[0033] Optionally, an exhaust valve may also be included;

[0034] The exhaust valve is located on the second pipeline.

[0035] According to another aspect of the present invention, a liquid cooling system is provided, including any of the control devices described in the first aspect.

[0036] The control device and liquid cooling system provided in this embodiment of the invention are deployed inside a single liquid cooling cabinet. By monitoring the coolant flow rate of the liquid cooling cabinet, the cabinet-level leakage monitoring and automatic isolation functions are realized, improving the accuracy of leakage and seepage detection, and enabling rapid emergency isolation of leakage points to reduce the scope of fault impact and improve the overall reliability and operation and maintenance efficiency of the liquid cooling system.

[0037] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of a liquid cooling system provided in an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the structure of a control device for a liquid cooling system provided in an embodiment of the present invention. Detailed Implementation

[0041] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0042] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0043] Figure 1 This is a schematic diagram of a liquid cooling system provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of a control device for a liquid cooling system provided in an embodiment of the present invention, as shown below. Figure 1 and Figure 2 As shown, the liquid cooling system 10 includes a liquid cooling cabinet 11, which includes a liquid cooling heat exchange unit 111. The control device 20 includes a loop water supply interface 21, a cabinet water supply interface 22, a loop return water interface 23, a cabinet return water interface 24, a storage tank 25, a power pump 26, an electric valve 27, a supply flow sensor 28, a return flow sensor 29, and a control unit 30. The loop water supply interface 21 is connected to the storage tank 25, which is connected to the cabinet water supply interface 22 via a first pipe 31. The power pump 26, the electric valve 27, and the supply flow sensor 28 are all mounted on the first pipe 31. The loop return water interface 23 and the cabinet return water interface 24 are connected via a second pipe 32, and the return flow sensor 29 is mounted on the second pipe 32. The loop water supply interface 21 and the cabinet water supply interface 22 are connected to the liquid supply pipeline 1112 of the liquid-cooled heat exchange unit 111, and the cabinet return water interface 24 and the loop return water interface 23 are connected to the return pipeline of the liquid-cooled heat exchange unit 111. The liquid supply flow sensor 28, the return flow sensor 29, the power pump 26, and the electric valve 27 are all communicatively connected to the control unit 30. The control unit 30 is configured to control the electric valve 27 and the power pump 26 to close when the liquid supply flow detected by the liquid supply flow sensor 28 and the return flow detected by the return flow sensor 29 meet a first preset condition.

[0044] Specifically, the liquid cooling system 10 is used in data centers or other environments that require efficient heat dissipation. It uses a coolant (such as water or a special coolant) as a medium to transfer heat from heat-generating devices (such as servers, processors, etc.) to maintain the optimal operating temperature of the devices.

[0045] The liquid-cooled cabinet 11 is a server cabinet in the liquid-cooling system 10 that is equipped with a liquid-cooling device. It is located within the outer wall 40 of the computer room. Each liquid-cooled cabinet 11 can contain multiple server nodes 110. The server node 110 can be a physical server, which can contain components such as processor (CPU), memory (RAM), storage device (hard disk / SSD) and network interface.

[0046] Server node 110 is cooled by a liquid cooling device, which may include a plate heat exchanger (PHE) 112. The coolant can transfer the heat generated by key heat-generating components (such as CPU, GPU, etc.) inside server node 110 through the plate heat exchanger 112.

[0047] The liquid cooling heat exchange unit 111 (Cooling Distribution Unit, CDU) is a liquid cooling device installed inside the liquid cooling cabinet 11. The liquid cooling heat exchange unit 111 includes a heat exchanger 1111, which is connected to the primary side and the secondary side piping to realize the process of transferring heat from the coolant inside the liquid cooling cabinet 11 to the external cold water source 50 outside the computer room wall 40.

[0048] The primary side refers to the coolant circulation loop that is directly connected to the external cold water source 50 (such as cooling tower 41) of the computer room. The coolant in the primary side coolant circulation loop has a lower temperature and is used to absorb heat from the secondary side and transfer it to the external environment.

[0049] The secondary side refers to the coolant circulation loop that is in direct contact with heat-generating devices such as server node 110. The secondary side coolant circulation loop is used to absorb the heat generated by server node 110. The coolant in the secondary side coolant circulation loop increases in temperature after passing through server node 110, and then transfers the heat to the primary side coolant through heat exchanger 1111.

[0050] It should be noted that the current liquid-cooled server product architecture adopts a centralized liquid cooling heat exchange unit (CDU). The centralized CDU provides cooling services for all liquid-cooled cabinets in the liquid cooling system. When there is a leakage problem in the secondary coolant circulation pipeline, liquid-cooled cabinets and other components, it will affect the normal operation of the entire data center module, and thus cause the risk of business interruption.

[0051] In this embodiment of the invention, a distributed liquid cooling heat exchange unit (CDU) architecture is adopted, in which each liquid cooling cabinet 11 is equipped with an independent liquid cooling heat exchange unit 111. The liquid cooling heat exchange unit 111 meets the cooling requirements inside the liquid cooling cabinet 11 it is located in. Even if a liquid cooling cabinet 11 experiences a fault such as leakage, it will not affect the normal operation of other liquid cooling cabinets 11.

[0052] Furthermore, the control device 20 is an intelligent control device for a liquid cooling system.

[0053] like Figure 1 and Figure 2 As shown, the loop water supply interface 21 of the control device 20 is connected to the liquid supply pipeline 1112 of the liquid-cooled heat exchange unit 111. The liquid-cooled heat exchange unit 111 outputs coolant cooled by the heat exchanger 1111 through the liquid supply pipeline 1112, and the coolant enters the control device 20 through the loop water supply interface 21.

[0054] Within the control device 20, the liquid storage tank 25 is connected to the loop water supply interface 21. Coolant input through the loop water supply interface 21 enters the liquid storage tank 25. The liquid storage tank 25 stores coolant, which can play a buffering role and help maintain pressure stability.

[0055] The liquid storage tank 25 has a capacity range of 4L to 5L to match the needs of a single liquid cooling cabinet 11. It can be easily integrated into the equipment rack at the bottom, side or near the liquid cooling cabinet 11 to avoid taking up too much space.

[0056] Optionally, the temperature of the coolant in the storage tank 25 is 35°C to 40°C, which helps to maximize the use of natural cooling (cooling tower, dry cooler or indirect evaporative cooling, etc.) and thus reduce refrigeration energy consumption.

[0057] The coolant tank 25 is connected to the cabinet water supply interface 22 through the first pipe 31. The coolant in the coolant tank 25 is output to the server node 110 through the first pipe 31 and the cabinet water supply interface 22 to absorb heat and cool the server node 110.

[0058] The power pump 26 is installed on the first pipeline 31 to push the coolant in the storage tank 25 along the first pipeline 31 to the cabinet water supply interface 22, and to ensure that the coolant can effectively flow through all the server nodes 110 that need to be cooled, thereby providing the power required for the circulation of the coolant.

[0059] An electric valve 27 is installed on the first pipe 31. The electric valve 27 is a valve that can be remotely or automatically controlled to open, close and adjust the opening degree, and can be used to precisely control the flow rate of coolant flowing through the first pipe 31.

[0060] Optionally, along the direction of coolant flow, the electric valve 27 can be located after the power pump 26. This can prevent the power pump 26 from running dry and causing damage to the pump body when the electric valve 27 is closed, but it is not limited to this.

[0061] A coolant flow sensor 28 is installed on the first pipe 31 to monitor the coolant flow rate (i.e., coolant supply flow rate) flowing through the first pipe 31 in real time.

[0062] Along the direction of coolant transmission, the coolant flow sensor 28 can be installed after the power pump 26 and the electric valve 27, that is, close to the water supply interface 22 of the rack, to measure the actual coolant flow (i.e., coolant supply flow) entering the server node 110 after being pressurized by the power pump 26 and regulated by the electric valve 27.

[0063] like Figure 1 and Figure 2 As shown, optionally, the liquid-cooled heat exchange unit 111 outputs coolant cooled by the heat exchanger 1111 through the liquid supply pipeline 1112. This coolant enters the storage tank 25 through the loop water supply interface 21. After flowing out of the storage tank 25, the coolant is first pressurized by the power pump 26 to obtain flow kinetic energy, ensuring sufficient pressure to push the coolant through the entire control device 20. The pressurized coolant flows through the electric valve 27, which can precisely control the flow rate of the coolant to dynamically adjust the supply of coolant according to demand. After passing through the electric valve 27, the coolant flows through the liquid supply flow sensor 28, and its flow rate can be accurately measured. The coolant continues to flow along the first pipeline 31 to the rack water supply interface 22, and finally enters the server node 110 to cool the server node 110.

[0064] like Figure 1 and Figure 2 As shown, optionally, the liquid-cooled cabinet 11 also includes a vertical cooling distribution unit (VCDU). The vertical cooling distribution unit 113 includes a liquid supply distribution pipeline 1131. The cabinet water supply interface 22 and each server node 110 are connected through the liquid supply distribution pipeline 1131. The coolant output from the cabinet water supply interface 22 flows into the liquid supply distribution pipeline 1131, and the liquid supply distribution pipeline 1131 evenly distributes the coolant obtained from the control device 20 to each server node 110.

[0065] Optionally, the vertical cooling distribution unit 113 is installed in the vertical direction of the liquid cooling cabinet 11, that is, along the height direction of the liquid cooling cabinet 11. It can be installed on a dedicated vertical bracket on the back, side or inside of the liquid cooling cabinet 11. The vertical arrangement can reduce the length of pipes and the number of bends, thereby reducing the pressure drop during the flow of coolant and improving the overall cooling efficiency.

[0066] like Figure 1 and Figure 2 As shown, the cabinet return water interface 24 of the control device 20 is connected to the return liquid pipeline 1113 of the liquid cooling heat exchange unit 111. The coolant that absorbs heat through the server node 110 re-enters the control device 20 through the cabinet return water interface 24.

[0067] Within the control device 20, the loop return water interface 23 and the cabinet return water interface 24 are connected by a second pipe 32. The coolant entering the control device 20 through the cabinet return water interface 24 returns to the liquid-cooled heat exchange unit 111 via the second pipe 32 and the loop return water interface 23. The high-temperature coolant that returns enters the heat exchanger 1111 and exchanges heat with the low-temperature coolant on the primary side again. The primary side coolant carries away the heat from the secondary side coolant, thereby lowering the temperature of the secondary side coolant and restoring its cooling capacity.

[0068] The return flow sensor 29 is installed on the second pipe 32 to monitor the flow rate of coolant flowing through the second pipe 32 in real time, thereby obtaining the actual flow rate of coolant returned from each server node 110 (i.e., return flow rate).

[0069] like Figure 1 and Figure 2 As shown, optionally, the vertical cooling distribution unit 113 also includes a return liquid distribution pipe 1132. The cabinet return water interface 24 and each server node 110 are connected through the return liquid distribution pipe 1132. The coolant that absorbs heat through each server node 110 flows into the return liquid distribution pipe 1132. The return liquid distribution pipe 1132 collects the coolant obtained from each server node 110 and sends it to the control device 20.

[0070] Furthermore, such as Figure 1 and Figure 2 As shown, the control device 20 includes a control unit 30, which is used to receive real-time data from various sensors, run preset control logic and algorithms, and send control commands to actuators (such as power pumps and electric valves).

[0071] The coolant flow sensor 28 is communicatively connected to the control unit 30 to provide the control unit 30 with the coolant flow rate (i.e., coolant supply flow rate) it acquires entering each server node 110.

[0072] The return flow sensor 29 is communicatively connected to the control unit 30 to provide the control unit 30 with the coolant flow rate (i.e., return flow rate) of the return liquid heat exchange unit 111 that it acquires.

[0073] The power pump 26 is communicatively connected to the control unit 30 to receive start / stop and speed regulation commands from the control unit 30.

[0074] The electric valve 27 is communicatively connected to the control unit 30 to receive opening / closing or opening degree adjustment commands from the control unit 30.

[0075] Optionally, the control unit 30 employs a microcontroller unit (MCU), which is equipped with a multi-core or powerful single-core processor, capable of handling multiple tasks simultaneously, such as temperature monitoring, flow control, and pressure regulation. It also possesses the ability to quickly respond to external events, helping to adjust cooling parameters promptly to prevent server overheating. Furthermore, MCUs are less expensive and can meet most control requirements, but are not limited to them.

[0076] Furthermore, in a sealed, leak-free liquid-cooled cabinet 11, the supply flow rate of the coolant should theoretically be very close to the return flow rate, allowing for a small, acceptable difference (e.g., ±5%) to accommodate flow fluctuations.

[0077] After acquiring the coolant supply flow rate and return flow rate, the control unit 30 can compare the supply flow rate and return flow rate. When the supply flow rate and return flow rate meet the first preset condition, it can determine that a leak has occurred.

[0078] The first preset condition can be defined as the supply flow rate being significantly greater than the return flow rate.

[0079] Optionally, the first preset condition may include the difference between the supply flow rate and the return flow rate exceeding a set threshold, such as 200 mL, in which case it is determined to be a leak.

[0080] Optionally, the first preset condition may include the proportion of return flow loss exceeding a set threshold, such as the ratio of the difference between supply flow and return flow to supply flow exceeding a set threshold, such as 10%, in which case it is determined to be a leak.

[0081] Optionally, the first preset condition may include the leakage state lasting for a certain period of time (e.g., 3 to 5 seconds) to eliminate misjudgments caused by instantaneous fluctuations or brief imbalances during startup, but it is not limited to this.

[0082] The traditional leak detection rope solution covers about 60% of the points, but there are blind spots in the monitoring of vertical cooling distribution unit 113, adapters, etc. In addition, the leak detection rope is easily affected by factors such as dust and ambient humidity. The leak can only be detected when the volume of the leak has accumulated to a sufficient amount and comes into contact with the leak detection rope. By this time, the leak may have been going on for some time, causing significant damage.

[0083] Based on the above-mentioned technical problems, the control device 20 provided in this embodiment of the invention does not rely on whether the leaking liquid comes into contact with a physical sensor. Instead, it is based on accurate flow monitoring of the entire cooling circuit and combined with a flow comparison algorithm. If the coolant leaks at any point in the path from "supply" to "return" (whether in the vertical cooling distribution unit 113, the adapter, the radiator 112, or other pipelines), the leak can be detected. This achieves comprehensive and accurate coverage of the leak scenario and significantly improves the effectiveness and accuracy of leak monitoring.

[0084] Furthermore, traditional leak detection rope solutions rely on manual on-site verification of leaks in the computer room and activation of corresponding emergency response measures when leaks are detected. This results in long response times and is highly susceptible to causing a cascading leak across the entire system.

[0085] The control device 20 provided in this embodiment of the invention is equipped with an independent liquid supply flow sensor 28 and a liquid return flow sensor 29 for each liquid cooling cabinet 11 (or each control device 20), realizing flow monitoring on a unit basis for liquid cooling cabinets 11. When the supply / return flow of a certain liquid cooling cabinet 11 is abnormal, the control device 20 can directly locate the liquid cooling cabinet 11 in which it is located, greatly improving the accuracy of leakage location.

[0086] After the control unit 30 determines that a leak has occurred, it immediately closes the electric valve 27 and stops the power pump 26 to automatically shut down the electric valve 27 and the power pump 26 at the liquid cooling cabinet 11 where the leak has occurred, thus quickly and effectively isolating the leak point.

[0087] In this case, only the coolant supply to the leaking liquid-cooled cabinet 11 is cut off, while the coolant supply to other normal liquid-cooled cabinets 11 remains unaffected. This allows other server nodes 110 to continue operating stably, thereby reducing the radius of impact of the fault from the ring network level to the single cabinet level. The radius of impact can be reduced by more than 90%, ensuring business continuity and improving the reliability and operation and maintenance efficiency of the liquid cooling system.

[0088] In summary, the control device provided in this embodiment of the invention is deployed inside a single liquid-cooled cabinet. By monitoring the coolant flow rate of the liquid-cooled cabinet, it realizes cabinet-level leakage monitoring and automatic isolation functions, improves the accuracy of leakage and seepage detection, and can quickly isolate leakage points in emergencies, reduce the scope of fault impact, and improve the overall reliability and operation and maintenance efficiency of the liquid cooling system.

[0089] like Figure 1 and Figure 2 As shown, optionally, the first preset condition includes the difference between the liquid supply flow rate detected by the liquid supply flow sensor 28 and the liquid return flow rate detected by the liquid return flow sensor 29 being greater than or equal to a first flow threshold.

[0090] The first flow threshold is a pre-set, non-negative flow value.

[0091] In this embodiment, the control unit 30 calculates the difference between the supply flow rate detected by the liquid flow sensor 28 and the return flow rate detected by the return flow sensor 29, and determines that a large amount of leakage has occurred when the difference is greater than or equal to the first flow threshold. Then, the electric valve 27 and the power pump 26 are shut down to automatically isolate the liquid cooling cabinet 11 where leakage has occurred.

[0092] The first flow rate threshold can be set within the range of 200 mL to 1 L, or further set to 500 mL to 1 L, so as to achieve the required sensitivity, thereby timely detecting leakage and avoiding unnecessary shutdown due to misjudgment.

[0093] like Figure 1 and Figure 2 As shown, optionally, the control device 20 provided in this embodiment of the invention further includes a supply pressure sensor (not shown) disposed on the first pipeline 31 and a return pressure sensor (not shown) disposed on the second pipeline 32. Both the supply pressure sensor and the return pressure sensor are communicatively connected to the control unit 30. The first preset condition includes that the difference between the supply flow rate detected by the supply flow rate sensor 28 and the return flow rate detected by the return flow rate sensor 29 is greater than or equal to a first flow rate threshold, and the difference between the supply pressure detected by the supply pressure sensor and the return pressure detected by the return pressure sensor is greater than or equal to a first pressure threshold.

[0094] Specifically, a coolant supply pressure sensor is installed on the first pipe 31 to measure the coolant pressure (i.e., the coolant supply pressure) in the first pipe 31.

[0095] Along the direction of coolant transmission, the coolant supply pressure sensor can be installed after the power pump 26 and the electric valve 27, that is, close to the water supply interface 22 of the rack, to measure the actual coolant pressure (i.e., supply pressure) entering the server node 110 after being pressurized by the power pump 26 and regulated by the electric valve 27.

[0096] A return pressure sensor is installed on the second pipe 32 to monitor the coolant pressure in the second pipe 32 in real time, thereby obtaining the actual coolant pressure (i.e., return pressure) returned from each server node 110.

[0097] In a sealed, leak-free liquid-cooled cabinet 11, the supply pressure of the coolant should theoretically be very close to the pressure flow rate, allowing for a small, acceptable difference (e.g., ±5%) to accommodate pressure fluctuations.

[0098] It should be noted that in certain specific situations, relying solely on flow monitoring may lead to misjudgments. For example, when the return line is blocked, the return flow may suddenly decrease, causing the difference between the supply flow and the return flow to be greater than or equal to the first flow threshold. In this case, the control unit 30 may misjudge the blockage as a leak.

[0099] In this embodiment, the control unit 30 calculates the difference between the supply flow rate detected by the liquid flow sensor 28 and the return flow rate detected by the return flow sensor 29, and calculates the difference between the supply pressure detected by the supply pressure sensor and the return pressure detected by the return pressure sensor. When the difference between the supply flow rate and the return flow rate is greater than or equal to a first flow rate threshold, and the difference between the supply pressure and the return pressure is greater than or equal to a first pressure threshold, the control unit 30 determines that a large amount of leakage has occurred, and then shuts down the electric valve 27 and the power pump 26 to automatically isolate the liquid cooling cabinet 11 where leakage has occurred.

[0100] With this configuration, under certain specific circumstances, such as when the return line is blocked, the pressure in the return line may rise abnormally due to the obstruction of the return flow. This causes the difference between the supply pressure and the return pressure to decrease or become negative, failing to meet the condition that the difference between the supply pressure and the return pressure is greater than or equal to the first pressure threshold. This prevents the control unit 30 from misjudging the leak.

[0101] The setting range of the first pressure threshold can be set according to actual needs, so as to achieve the required sensitivity and detect leakage in time while avoiding false judgments that lead to unnecessary shutdowns.

[0102] The combined flow and pressure data can provide the control unit 30 with richer status information, which helps to make more accurate fault diagnosis. For example, when the difference between the supply flow and the return flow is greater than or equal to the first flow threshold, the control unit 30 can further identify the fault type (such as leakage or blockage) based on the difference between the supply pressure and the return pressure, so that the control device 20 is more stable and reliable when facing complex and changing operating conditions.

[0103] In another embodiment, the control unit 30 can also determine the fault type based solely on the supply pressure and / or return pressure. For example, when the supply pressure is less than the second pressure threshold, it indicates that the supply pressure is too low and there may be problems such as a fault in the power pump 26. In this case, the control unit 30 can issue an alarm to prompt maintenance personnel to troubleshoot the fault.

[0104] The second pressure threshold can be set within the range of 1.5 MPa to 2 MPa, for example, 1.5 MPa or 2 MPa, to ensure that the liquid cooling cabinet 11 has sufficient liquid supply pressure, but is not limited to this.

[0105] likeFigure 1 and Figure 2 As shown, optionally, the control device 20 provided in this embodiment of the invention further includes an output module (not shown) communicatively connected to the control unit 30. The control unit 30 is also configured to issue a first alarm message through the output module when the difference between the supply flow rate detected by the supply flow rate sensor 28 and the return flow rate detected by the return flow rate sensor 29 is greater than or equal to a second flow threshold. The second flow threshold is less than the first flow threshold.

[0106] Specifically, the output module is used to output the internal status or decision results of the control unit 30 to the outside. The output module may include a display screen, indicator lights, voice module, buzzer and remote alarm module, but is not limited to these.

[0107] In this embodiment, a second flow threshold is set that is less than the first flow threshold. The second flow threshold can be greater than the normal flow fluctuation range of the system, but much less than the leakage amount that may cause serious harm.

[0108] Optionally, the second flow threshold can be set in the range of 20mL to 50mL to achieve the required sensitivity and detect minute leaks in a timely manner while avoiding false alarms. This embodiment of the invention does not specifically limit this.

[0109] When the difference between the supply flow rate and the return flow rate calculated by the control unit 30 is greater than or equal to the second flow threshold, the first alarm message is issued through the output module to provide an early warning of abnormal flow difference. This allows for a warning even when the leakage is still in its minor seepage stage, prompting maintenance personnel to proactively inspect the site and confirm whether there are any hidden dangers such as loose joints or aging seals. Tightening or replacement can be performed before the problem worsens. Furthermore, for minor leaks, it is not necessary to immediately shut down the isolation liquid-cooled cabinet 11, avoiding unplanned server downtime due to minor issues and ensuring business continuity.

[0110] like Figure 1 and Figure 2 As shown, optionally, the control device 20 provided in this embodiment of the invention further includes a return liquid temperature sensor (not shown) disposed on the second pipeline 32. The return liquid temperature sensor is communicatively connected to the control unit 30. The control unit 30 is configured to increase the speed of the power pump 26 when the return liquid temperature detected by the return liquid temperature sensor is greater than a first temperature threshold; and to decrease the speed of the power pump 26 when the return liquid temperature detected by the return liquid temperature sensor is less than the first temperature threshold.

[0111] Specifically, a return temperature sensor is installed on the second pipe 32 to measure the coolant temperature (i.e., return temperature) returning from the server node 110 to the control device 20.

[0112] The return temperature directly reflects the heat dissipation effect. Specifically, the coolant flows through the plate-cooled radiator 112 at server node 110, absorbing the heat from server node 110. Therefore, the temperature at which the coolant flows out of server node 110 (i.e., the return temperature) reflects the amount of heat carried away from server node 110.

[0113] Understandably, a higher return fluid temperature results in a higher temperature for server node 110. If the return fluid temperature continues to rise, it indicates that server node 110 is generating a large amount of heat, or that the current coolant flow rate is insufficient to dissipate all the heat. Conversely, a lower return fluid temperature results in a lower temperature for server node 110. If the return fluid temperature is very low, it indicates that server node 110 is generating relatively little heat, or that the current coolant flow rate exceeds the actual demand.

[0114] In this embodiment, the return liquid temperature sensor is communicatively connected to the control unit 30 to send the monitored return liquid temperature to the control unit 30. The control unit 30 compares the return liquid temperature with a preset first temperature threshold and dynamically adjusts the rotation speed of the power pump 26.

[0115] When the return fluid temperature exceeds the first temperature threshold, the server node 110 generates excessive heat, or the current coolant flow rate is insufficient, causing the server node 110 temperature to be too high and posing a potential overheating risk. In this case, the control unit 30 can increase the speed of the power pump 26 to increase the coolant flow rate, allowing more coolant to flow through the server node 110 more quickly, so as to remove the heat generated by the server node 110 more rapidly.

[0116] When the return fluid temperature is below the first temperature threshold, the server node 110 generates less heat, or the current coolant flow is sufficient, resulting in a low temperature for the server node 110 and wasted energy. At this time, the control unit 30 can reduce the speed of the power pump 26 and reduce the coolant flow rate. While ensuring the operating temperature of the server node 110, this reduces the power and energy consumption of the power pump 26, saving electrical energy.

[0117] The first temperature threshold is a preset target temperature or reference temperature, which can be understood as the expected normal operating temperature point during the design of the liquid cooling system. The setting range of the first temperature threshold can be from 40°C to 55°C (e.g., 45°C, 50°C, or 55°C, etc.) to simultaneously meet cooling and energy efficiency requirements. This embodiment of the invention does not specifically limit this range.

[0118] In this embodiment, during the operation of the liquid cooling system, the control device 20 dynamically compensates the speed of the power pump 26 based on the return liquid temperature to dynamically replenish the cooling capacity of the coolant, improve the cooling accuracy, stabilize the operating temperature of core components such as the processor and memory of the IT equipment in the server node 110, and help improve green efficiency.

[0119] like Figure 1 and Figure 2 As shown, optionally, the control device 20 provided in this embodiment of the invention further includes a return liquid temperature sensor (not shown) disposed on the second pipeline 32. The return liquid temperature sensor is communicatively connected to the control unit 30. The control unit is configured to determine the target opening degree of the electric valve 27 and adjust the opening degree of the electric valve 27 to the target opening degree when the return liquid temperature detected by the return liquid temperature sensor is greater than or less than a first temperature threshold.

[0120] The location, connection, and function of the return liquid temperature sensor can be referred to in the above embodiments, and will not be repeated here.

[0121] The target opening degree refers to the ideal opening degree that the electric valve 27 should achieve, calculated based on the current liquid cooling system status (such as temperature, flow rate, etc.) and control strategy.

[0122] In this embodiment, the control unit 30 compares the return liquid temperature with a preset first temperature threshold. When the return liquid temperature detected by the return liquid temperature sensor is greater than or less than the first temperature threshold, it indicates that the current cooling capacity of the coolant does not match the operating temperature requirements of the server node 110. At this time, the control unit 30 dynamically adjusts the opening of the electric valve 27 to dynamically adjust the coolant flow rate so that the return liquid temperature reaches the first temperature threshold. This can improve the cooling accuracy and stabilize the operating temperature of core components such as the processor and memory of the IT equipment in the server node 110.

[0123] The control unit 30 can determine the target opening degree based on the return liquid temperature and a first temperature threshold through a preset algorithm. The preset algorithm can be a PID control algorithm (Proportional Integral Derivative Controller), which calculates a control variable (such as the target opening degree of the electric valve 27) based on the current error (i.e., the difference between the return liquid temperature and the first temperature threshold) and the trend of error change, so as to drive the controlled object (such as the electric valve 27) to reach the desired state, but is not limited to this.

[0124] For example, the target opening U(t) can be calculated using the formula U(t)=K1*e(t)+C.

[0125] Wherein, K1 is the proportional gain coefficient. The value of K1 can be adjusted according to the specific application scenario to achieve the best control effect. This embodiment of the invention does not impose specific limitations on this.

[0126] e(t) is the difference between the return liquid temperature and the first temperature threshold.

[0127] C represents the current opening degree of electric valve 27.

[0128] Furthermore, the control unit 30 sends an opening command to the electric valve 27 based on the final calculated target opening degree U(t), adjusting the opening degree of the electric valve 27 to the target opening degree, thereby dynamically adjusting the coolant flow rate, improving cooling accuracy, and stabilizing the operating temperature of core components such as the processor and memory of the IT equipment in the server node 110.

[0129] In other embodiments, a return liquid temperature-target opening degree mapping table can be preset, and the target opening degree can be determined based on the return liquid temperature and the first temperature threshold by looking up the table. This embodiment of the invention does not specifically limit this.

[0130] like Figure 1 and Figure 2 As shown, optionally, when the return liquid temperature detected by the return liquid temperature sensor is greater than the first temperature threshold, the target opening degree is greater than the current opening degree of the electric valve 27; when the return liquid temperature detected by the return liquid temperature sensor is less than the first temperature threshold, the target opening degree is less than the current opening degree of the electric valve 27.

[0131] Specifically, when the return fluid temperature exceeds the first temperature threshold, the server node 110 generates a large amount of heat, or the current coolant flow is insufficient, causing the server node 110 temperature to be too high and posing a potential overheating risk. At this time, the control unit 30 determines a target opening degree greater than the current opening degree of the electric valve 27 to increase the opening degree of the electric valve 27, thereby increasing the coolant flow and enabling the server node 110 to be cooled more effectively.

[0132] When the return temperature is lower than the first temperature threshold, the server node 110 generates less heat, or the current coolant flow is sufficient, resulting in a lower temperature for the server node 110. At this time, the control unit 30 can determine a target opening degree that is less than the current opening degree of the electric valve 27, thereby reducing the opening degree of the electric valve 27 and decreasing the coolant flow, which helps to stabilize the operating temperature of core components such as the processor and memory of the IT equipment in the server node 110.

[0133] Optionally, the return liquid temperature sensor can be connected to the control unit 30 via a filtering unit. The filtering unit is used to filter the raw return liquid temperature data of the return liquid temperature sensor (such as a low-pass filter) to remove noise interference and ensure the accuracy of the data.

[0134] In this embodiment, during the operation of the liquid cooling system, the control device 20 dynamically compensates the opening of the electric valve 27 based on the return liquid temperature to dynamically adjust the coolant flow rate, improve the cooling accuracy, and stabilize the operating temperature of core components such as the processor and memory of the IT equipment in the server node 110.

[0135] like Figure 1 and Figure 2As shown, optionally, when the target opening is less than or equal to the preset maximum opening, the opening of the electric valve 27 is adjusted to the target opening. When the target opening is greater than the preset maximum opening, the opening of the electric valve 27 is adjusted to the preset maximum opening.

[0136] Specifically, the electric valve 27 has limitations in its mechanical design. For example, the opening range of the electric valve 27 is designed to be from 0 (fully closed) to 100 (fully open).

[0137] In this embodiment, to prevent an unrealistic command from being output due to the target opening degree exceeding the opening range of the electric valve 27, thereby damaging the actuator or drive circuit of the electric valve 27, a maximum physical opening degree that the electric valve 27 is allowed to reach is preset as the preset maximum opening degree of the target opening degree.

[0138] The preset maximum opening can be set to 100, but it is not limited to this. In other embodiments, the preset maximum opening can also be set to 95, 90, etc., to leave a certain safety margin.

[0139] In this embodiment, when the target opening is less than or equal to the preset maximum opening, it means that the target opening determined by the control unit 30 is within the physical capability range of the electric valve 27. At this time, the control unit 30 can directly adjust the opening of the electric valve 27 to the target opening to achieve on-demand adjustment.

[0140] When the target opening is greater than the preset maximum opening, it means that the target opening determined by the control unit 30 exceeds the physical limit of the electric valve 27. At this time, the control unit 30 can adjust the opening of the electric valve 27 to the preset maximum opening so that the electric valve 27 can operate at its maximum capacity and provide the maximum coolant flow rate that the liquid cooling system can provide.

[0141] like Figure 1 and Figure 2 As shown, optionally, the control device 20 provided in this embodiment of the invention further includes a liquid supply temperature sensor (not shown) disposed on the first pipeline 31, a liquid return temperature sensor (not shown) disposed on the second pipeline 32, and an output module (not shown) communicatively connected to the control unit 30. Both the liquid supply temperature sensor and the liquid return temperature sensor are communicatively connected to the control unit 30. The control unit 30 is also configured to determine the heat load of the liquid-cooled cabinet 11 based on the liquid supply temperature detected by the liquid supply temperature sensor and the liquid return temperature detected by the liquid return temperature sensor, and to issue a second alarm message through the output module when the heat load is less than a first heat load threshold.

[0142] Specifically, a coolant supply temperature sensor is installed on the first pipeline 31 to measure the temperature of the coolant entering the server node 110 (i.e., the coolant supply temperature). The coolant supply temperature sensor is communicatively connected to the control unit 30 to send the coolant supply temperature to the control unit 30.

[0143] A return temperature sensor is installed on the second pipe 32 to measure the coolant temperature (i.e., return temperature) returning from server node 110 to control unit 20. The return temperature sensor is communicatively connected to control unit 30 to send the return temperature to control unit 30.

[0144] The control unit 30 is communicatively connected to the output module to send alarm information to the outside through the output module. The structure and function of the output module can be referred to the above embodiment, and will not be repeated here.

[0145] In this embodiment, the output module determines the heat load of the liquid-cooled cabinet 11 based on the supply temperature and return temperature. The heat load represents the total heat absorbed by the coolant from heat sources such as the server node 110 per unit time, which is the core indicator for measuring the actual heat dissipation task undertaken by the liquid-cooled cabinet 11.

[0146] The control unit 30 can determine the heat transfer capacity based on the supply liquid temperature and return liquid temperature through a refrigerant heat transfer algorithm.

[0147] For example, the control unit 30 calculates the heat carrying capacity Q (in W) using the formula Q = M * C * T.

[0148] Where M is the flow rate of the coolant (kg / s), which can be understood as the mass of coolant flowing through a certain cross section per unit time. It can be calculated by multiplying the flow rate of the coolant by the density of the coolant.

[0149] C represents the specific heat capacity of the refrigerant at constant pressure (J / (kg*K)), which can be understood as the amount of heat that needs to be absorbed (or released) for 1 kg of coolant to increase (or decrease) its temperature by 1 Kelvin (or degree Celsius). It reflects the heat storage capacity of the coolant.

[0150] For example, when the coolant is an aqueous solution of ethylene glycol, C can be corrected to x%*C1{p,glycol}+(1-x%)C2{p,water}.

[0151] Where x% is the mass fraction or volume fraction of ethylene glycol.

[0152] C1{p,glycol} is the isobaric specific heat capacity of ethylene glycol.

[0153] C2{p,water} is the specific heat capacity of water at constant pressure.

[0154] T is the temperature difference between the return liquid temperature and the supply liquid temperature.

[0155] Furthermore, when the heat load is less than the first heat load threshold, the coolant may not effectively cool the server node 110, which may result in the server overheating and being damaged.

[0156] At this time, the control unit 30 can send a second alarm message through the output module to provide an early warning of abnormal heat load. This can prompt maintenance personnel to go to the site for inspection to confirm whether there are faults such as inefficient no-load or damaged temperature sensors. This helps to achieve a higher energy efficiency ratio, promote energy conservation and consumption reduction, and effectively improve the level of green operation.

[0157] like Figure 1 and Figure 2 As shown, optionally, the control device 20 provided in this embodiment of the invention further includes an exhaust valve 33, which is disposed on the second pipeline 32.

[0158] Specifically, in a liquid cooling system, gas should not be present in the coolant circulation pipes; otherwise, it will obstruct the normal flow of coolant, leading to a decrease in flow rate or even a complete interruption, preventing effective cooling of server node 110 and easily causing overheating failures. Simultaneously, the thermal conductivity of gas is far lower than that of liquid; bubbles adhering to the surface of the plate-cooled radiator 112 or heat exchanger 1111 will form a heat insulation layer, significantly reducing heat exchange efficiency. Furthermore, the readings of the flow sensor and temperature sensor may be distorted due to bubble interference, thus affecting the judgment of the control device.

[0159] Based on the above-mentioned technical problems, in this embodiment, an exhaust valve 33 is provided on the second pipeline 32 to discharge non-condensable gas (mainly air) accumulated in the second pipeline 32 (return pipeline), ensuring smooth circulation of coolant, which is beneficial to improving cooling efficiency and enabling the control device to accurately detect leakage.

[0160] The exhaust valve 33 may include a manual exhaust valve or an automatic exhaust valve, and the embodiments of the present invention do not specifically limit it.

[0161] like Figure 1 and Figure 1 As shown, optionally, a return tank 34 is also provided on the second pipeline 32, and an exhaust valve 33 can be installed on the return tank 34.

[0162] The return tank 34 helps maintain pressure stability throughout the entire circulation loop and reduces pressure fluctuations caused by temperature variations.

[0163] In this embodiment, the internal space of the return tank 34 is relatively large, and the coolant flow rate is significantly reduced at the return tank 34, providing sufficient time for bubbles to reside and rise. At this time, the top of the return tank 34 is a relatively ideal point for gas accumulation in the system, and installing the vent valve 33 at this location facilitates the discharge of gas from the system.

[0164] Optionally, the output module adopts a display panel (such as an LCD panel). The control unit 30 can display the operating status information such as coolant flow rate, temperature, temperature difference, heat load, and alarm information in real time through the output module, so as to facilitate on-site maintenance personnel to view parameters, confirm alarms, and perform manual tests (such as starting and stopping pumps and switching valves).

[0165] Optionally, the output module includes components such as a remote communication interface, thereby supporting functions such as remote network monitoring, emergency takeover, and online digitization, which helps to improve the intelligent operation and maintenance level of the liquid cooling system and the continuity of system operation.

[0166] Optionally, the supply flow sensor 28 and the return flow sensor 29 can be ultrasonic flow meters. The ultrasonic flow meters can be directly clamped to the outer wall of the pipe and can work without changing the internal structure of the pipe, which can reduce the risk of leakage, but it is not limited to this.

[0167] Based on the same inventive concept, embodiments of the present invention also provide a liquid cooling system, such as... ​ As shown, the liquid cooling system 10 includes the control device described in any embodiment of the present invention. ​ (not shown in the figure), therefore, the liquid cooling system 10 provided in the embodiments of the present invention has the technical effects of the technical solutions in any of the above embodiments, and the explanations of the same or corresponding structures and terms as in the above embodiments will not be repeated here.

[0168] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0169] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A control device for a liquid cooling system, characterized in that, The liquid cooling system includes a liquid cooling cabinet, and the liquid cooling cabinet includes a liquid cooling heat exchange unit; The control device includes a loop water supply interface, a cabinet water supply interface, a loop return water interface, a cabinet return water interface, a storage tank, a power pump, an electric valve, a supply flow sensor, a return flow sensor, and a control unit. The loop water supply interface is connected to the liquid storage tank, and the liquid storage tank is connected to the cabinet water supply interface through the first pipeline. The power pump, the electric valve and the liquid supply flow sensor are all installed on the first pipeline. The loop return water interface and the cabinet return water interface are connected by a second pipeline, and the return liquid flow sensor is installed on the second pipeline; The loop water supply interface and the cabinet water supply interface are connected to the liquid supply pipeline of the liquid cooling heat exchange unit, and the cabinet return water interface and the loop return water interface are connected to the return pipeline of the liquid cooling heat exchange unit. The supply flow sensor, the return flow sensor, the power pump, and the electric valve are all communicatively connected to the control unit. The control unit is configured to control the electric valve and the power pump to close when the supply flow detected by the supply flow sensor and the return flow detected by the return flow sensor meet a first preset condition.

2. The control device according to claim 1, characterized in that, The first preset condition includes a difference between the liquid supply flow rate detected by the liquid supply flow sensor and the liquid return flow rate detected by the liquid return flow sensor being greater than or equal to a first flow threshold.

3. The control device according to claim 1, characterized in that, It also includes a liquid supply pressure sensor installed on the first pipeline and a liquid return pressure sensor installed on the second pipeline; Both the supply pressure sensor and the return pressure sensor are communicatively connected to the control unit. The first preset condition includes that the difference between the liquid supply flow rate detected by the liquid supply flow sensor and the liquid return flow rate detected by the liquid return flow sensor is greater than or equal to a first flow threshold, and the difference between the liquid supply pressure detected by the liquid supply pressure sensor and the liquid return pressure detected by the liquid return pressure sensor is greater than or equal to a first pressure threshold.

4. The control device according to claim 2 or 3, characterized in that, It also includes an output module that is communicatively connected to the control unit; The control unit is also configured to issue a first alarm message through the output module when the difference between the supply flow rate detected by the supply flow rate sensor and the return flow rate detected by the return flow rate sensor is greater than or equal to a second flow threshold. The second flow threshold is less than the first flow threshold.

5. The control device according to claim 1, characterized in that, It also includes a return liquid temperature sensor installed on the second pipeline; The return liquid temperature sensor is communicatively connected to the control unit; The control unit is configured to increase the speed of the power pump when the return liquid temperature detected by the return liquid temperature sensor is greater than a first temperature threshold, and to decrease the speed of the power pump when the return liquid temperature detected by the return liquid temperature sensor is less than the first temperature threshold.

6. The control device according to claim 1, characterized in that, It also includes a return liquid temperature sensor installed on the second pipeline; The return liquid temperature sensor is communicatively connected to the control unit; The control unit is configured to determine the target opening degree of the electric valve and adjust the opening degree of the electric valve to the target opening degree when the return liquid temperature detected by the return liquid temperature sensor is greater than or less than a first temperature threshold.

7. The control device according to claim 6, characterized in that, When the return liquid temperature detected by the return liquid temperature sensor is greater than the first temperature threshold, the target opening degree is greater than the current opening degree of the electric valve; when the return liquid temperature detected by the return liquid temperature sensor is less than the first temperature threshold, the target opening degree is less than the current opening degree of the electric valve.

8. The control device according to claim 6, characterized in that, When the target opening is less than or equal to the preset maximum opening, the opening of the electric valve is adjusted to the target opening. When the target opening degree is greater than the preset maximum opening degree, the opening degree of the electric valve is adjusted to the preset maximum opening degree.

9. The control device according to claim 1, characterized in that, It also includes a liquid supply temperature sensor installed on the first pipeline, a liquid return temperature sensor installed on the second pipeline, and an output module that is communicatively connected to the control unit; Both the supply temperature sensor and the return temperature sensor are communicatively connected to the control unit. The control unit is also configured to determine the heat load of the liquid cooling cabinet based on the supply temperature detected by the supply temperature sensor and the return temperature detected by the return temperature sensor, and to issue a second alarm message through the output module when the heat load is less than a first heat load threshold.

10. The control device according to claim 1, characterized in that, It also includes an exhaust valve; The exhaust valve is located on the second pipeline.

11. A liquid cooling system, characterized in that, Includes the control device as described in any one of claims 1-10.

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