Liquid cooling system for cooling a server cabinet

Abstract

A liquid cooling system for cooling a server cabinet includes a supply liquid outlet and a recovery liquid inlet connected to the server cabinet, a radiator receiving coolant from the server cabinet at the recovery liquid inlet and cooling the coolant by a plurality of fans, a water storage tank supplying the coolant to the server cabinet by a pump, and a controller recording a pressure difference between the supply liquid outlet and the recovery liquid inlet as a second set value when a flow value of the coolant reaches a first set value. When the liquid cooling system operates in a flow control mode and the controller determines that the flow value of the coolant is abnormal, the controller switches to a pressure difference control mode and controls the pump according to the second set value.

Description

Technical Field

[0001] This application relates to a servo cabinet, and more particularly to a liquid cooling system for cooling the servo cabinet. Background Technology

[0002] A liquid cooling system (liquid heat dissipation system) is a system that dissipates heat from multiple servers within a server rack by delivering a coolant to the rack. Specifically, the liquid cooling system introduces a low-temperature coolant into the server rack to absorb the heat dissipated by the servers and recovers the high-temperature coolant after heat absorption. Furthermore, after cooling the high-temperature coolant back to a low-temperature coolant, the system recirculates the low-temperature coolant back into the server rack.

[0003] In general, liquid cooling systems are controlled using flow control and differential pressure control. Flow control maintains a constant total flow rate of coolant into the servo cabinet, while differential pressure control maintains a constant pressure difference between the input (the end receiving low-temperature coolant into the servo cabinet) and the output (the end receiving high-temperature coolant from the servo cabinet). However, regardless of whether flow control or differential pressure control is used, the system will become uncontrollable if the flow sensor / differential pressure sensor fails.

[0004] Some liquid cooling systems will directly supply coolant to the servo machine based on a preset flow rate after a sensor failure. Other systems will immediately switch to a different control mode upon sensor failure; for example, if originally using flow control, they will immediately switch to differential pressure control after a flow sensor failure. However, after a period of use, liquid cooling system pipes and filters may experience sedimentation or blockage, and the servo cabinet may experience impedance changes due to the replacement of internal servos. These factors can cause a large discrepancy between the preset flow rate and the actual flow rate, leading to drastic fluctuations in the pump's speed after the control mode switch.

[0005] On the other hand, if the switch from flow control to differential pressure control is instantaneous, a mismatch between the flow rate setpoint and the differential pressure setpoint may cause severe fluctuations in the pump, which could adversely affect the server rack. Similarly, the same mismatch between the differential pressure setpoint and the flow rate setpoint will occur when switching from differential pressure control to flow control. Summary of the Invention

[0006] This application provides a liquid cooling system for cooling servo cabinets, which can switch the liquid cooling system from flow control mode to differential pressure control mode, or vice versa, without causing drastic fluctuations in the pump.

[0007] In one embodiment, the liquid cooling system of this application includes:

[0008] A liquid supply outlet is connected to a liquid inlet of a server cabinet;

[0009] A liquid recovery inlet is connected to a liquid outlet of the servo cabinet;

[0010] A radiator includes multiple fans, wherein the radiator is configured to receive a coolant from the server rack after the temperature rises via the recovery liquid inlet, and to operate the multiple fans to cool the coolant.

[0011] A water tank, including at least one pump, wherein the water tank is configured to operate the at least one pump to supply cooled coolant from the supply liquid outlet to the server rack; and

[0012] A controller is configured to detect a flow rate of the coolant at the recovery liquid inlet or the supply liquid outlet, and to record a pressure difference between the supply liquid outlet and the recovery liquid inlet as a second set value when the flow rate reaches a first set value.

[0013] The liquid cooling system operates in a flow control mode, and the controller is configured to switch to a differential pressure control mode when the flow value of the recovered liquid inlet or the supplied liquid outlet is abnormal during the operation of the at least one pump, and control the operation of the at least one pump according to the second set value.

[0014] In another embodiment, the liquid cooling system of this application includes:

[0015] A liquid supply outlet is connected to a liquid inlet of a server cabinet;

[0016] A liquid recovery inlet is connected to a liquid outlet of the servo cabinet;

[0017] A radiator includes multiple fans, wherein the radiator is configured to receive a coolant from the server rack after the temperature rises via the recovery liquid inlet, and to operate the multiple fans to cool the coolant.

[0018] A water tank, including at least one pump, wherein the water tank is configured to operate the at least one pump to supply cooled coolant from the supply liquid outlet to the server rack; and

[0019] A controller is configured to detect a pressure difference between the coolant at the recovery liquid inlet and the supply liquid outlet, and to record a flow rate of the coolant at the supply liquid outlet or the recovery liquid inlet as a second set value when the pressure difference reaches a first set value.

[0020] The liquid cooling system operates in a differential pressure control mode, and the controller is configured to switch to a flow control mode when the at least one pump is running and the differential pressure value is determined to be abnormal, and to control the operation of the at least one pump according to the second set value.

[0021] Compared to related technologies, the liquid cooling system of this application can avoid large fluctuations in the system after switching the currently used control mode, thereby maintaining the stability of system control. It will not affect the delivery of coolant due to sensor failure, nor will it damage the servo cabinet connected to the liquid cooling system. Attached Figure Description

[0022] Figure 1 This is a first embodiment of the liquid cooling system of this application;

[0023] Figure 2 This is an embodiment of the liquid cooling system of this application, shown in a block diagram;

[0024] Figure 3 This is a first embodiment of the control method flowchart for the liquid cooling system of this application;

[0025] Figure 4 This is a second embodiment of the control method flowchart for the liquid cooling system of this application;

[0026] Figure 5 This is a second embodiment of the liquid cooling system of this application.

[0027] Explanation of reference numerals in the attached figures

[0028] 1: Liquid cooling system

[0029] 10: Controller

[0030] 11: Supply liquid outlet

[0031] 12: Recycled Liquid Inlet

[0032] 13: Radiator

[0033] 131: Fan

[0034] 14: Water storage tank

[0035] 141: Pump

[0036] 15: Memory

[0037] 151: First setting value

[0038] 152: Second setting value

[0039] 16: Flow meter

[0040] 17: Differential pressure gauge

[0041] 2: Coolant

[0042] 3: Servo cabinet

[0043] 31: Liquid Inlet

[0044] 32: Liquid outlet

[0045] 4: Server

[0046] S31~S37: Control Steps

[0047] S41~S47: Control Steps Detailed Implementation

[0048] Please see Figure 1 and Figure 2 ,in Figure 1 This is a schematic diagram of the first embodiment of the liquid cooling system of this application. Figure 2 This is a block diagram of an embodiment of the liquid cooling system of this application. This application discloses a liquid cooling system 1 for cooling a servo cabinet 3. As shown... Figure 1 As shown, the liquid cooling system 1 has a supply liquid outlet 11 and a recovery liquid inlet 12, and the servo cabinet 3 has a liquid inlet 31 and a liquid outlet 32. The liquid cooling system 1 is connected to the liquid inlet 31 of the servo cabinet 3 through the supply liquid outlet 11, and is connected to the liquid outlet 32 ​​of the servo cabinet through the recovery liquid inlet 12.

[0049] The liquid cooling system 1 contains a coolant 2. The coolant 2 can be, for example, water, an aqueous solution of ethylene glycol, an aqueous solution of propylene glycol, refrigeration oil, or a refrigerant, and is not limited thereto. The liquid cooling system 1 supplies the coolant to the server rack 3 through a liquid outlet 11 and receives the coolant 2 from the server rack 3 through a liquid return inlet 12. The liquid cooling system 1 internally cools the coolant 2 to produce a low-temperature coolant, and then delivers the low-temperature coolant to the server rack 3 to dissipate heat from the multiple servers 4 housed within the server rack 3. Specifically, after flowing into the server rack 3, the coolant 2 absorbs the heat generated by the multiple servers 4 and gradually transforms into a high-temperature coolant (e.g., 25–40°C). Once the coolant 2 absorbs heat and transforms into a high-temperature coolant (e.g., its temperature is equal to or higher than that of the server 4), it no longer has a heat dissipation function.

[0050] The liquid cooling system 1 receives high-temperature coolant from the server rack 3 through the liquid recovery inlet 12, and cools the high-temperature coolant through internal operation, so that the high-temperature coolant is transformed back into a low-temperature coolant that can be used for heat dissipation (e.g., 15-25°C, i.e., the temperature is lower than that of the server 4).

[0051] like Figure 1 and Figure 2 As shown, the liquid cooling system 1 has at least one set of heat sinks 13, each heat sink 13 including multiple fans 131. In this application, after receiving coolant 2 (i.e., high-temperature coolant) from the server rack 3, the liquid cooling system 1 guides the coolant 2 to the heat sink 13. The heat sink 13 operates the multiple fans 131 and receives the cooled coolant 2 from the server rack 3 via the liquid recovery inlet 12 after its temperature has increased. The operation of the multiple fans 131 then cools the coolant 2, converting the high-temperature coolant into a low-temperature coolant.

[0052] In the above embodiments, the radiator 13 cools the coolant 2 using multiple fans 131. In other embodiments, the radiator 13 may also be equipped with components such as a heat exchanger, a cooling tower, or a chiller to cool the coolant 2, and is not limited to the aforementioned fans 131.

[0053] like Figure 1 and Figure 2 As shown, the liquid cooling system 1 also has at least one set of water storage tanks 14, and each water storage tank 14 includes at least one pump 141. In this application, the water storage tank 14 is used to collect the cooled coolant 2. Furthermore, the water storage tank 14 is controlled by the controller 10 to operate at least one pump 141 to deliver the coolant 2 (i.e., cryogenic coolant) through pipelines to the liquid supply outlet 11, and to input the cryogenic coolant into the server rack 3 through the liquid supply outlet 11. Through the cooling process of the radiator 13 and the delivery process of the water storage tank 14, the coolant 2 can continuously circulate between the liquid cooling system 1 and the server rack 3 to continuously dissipate heat for the multiple servers 4 in the server rack 3.

[0054] like Figure 2 As shown, the liquid cooling system 1 also includes a controller 10, which is electrically connected to the heat sink 13 and the water tank 14 to control the heat sink 13, multiple fans 131, the water tank 14, and the pump 141. In one embodiment, the controller 10 may be implemented by a central processing unit (CPU), a micro control unit (MCU), a programmable logic controller (PLC), a system-on-a-chip (SoC), or a field-programmable gate array (FPGA).

[0055] In this application, the controller 10 can control the liquid cooling system 1 to operate in either flow control mode or differential pressure control mode. In flow control mode, when the liquid cooling system 1 outputs coolant 2 to the server rack 3, it maintains the coolant 2 at a required flow rate, such as 100 lpm, 130 lpm, or 150 lpm, depending on the size of the server rack 3, the type and number of servers 4, and other heat dissipation factors. In differential pressure control mode, when the liquid cooling system inputs coolant 2 to the server rack 3, it maintains a fixed pressure difference between the output and input coolant 2. Therefore, the liquid cooling system 1 can ensure that the coolant 2 input to the server rack 3 is stable.

[0056] When the controller 10 controls the liquid cooling system 1 to operate in flow control mode, the controller 10 continuously monitors the flow rate of the coolant 2. In one embodiment, the controller 10 monitors the flow rate of the coolant 2 at the recovery liquid inlet 12. In another embodiment, the controller 10 monitors the flow rate of the coolant 2 at the supply liquid outlet 11. In yet another embodiment, the controller 10 monitors the flow rate of the coolant at any point in the piping within the liquid cooling system 1. A key feature of this application is that when the flow rate of the coolant 2 is detected to reach a preset first set value 151, the controller 10 obtains the pressure difference between the coolant 2 at the output end (e.g., at the supply liquid outlet 11) and the coolant 2 at the input end (e.g., at the recovery liquid inlet 12), and records this pressure difference as a second set value 152.

[0057] When the flow rate of coolant 2 falls within the first set value 151, it indicates that the liquid cooling system 1 is operating normally in the flow control mode. Therefore, the pressure difference at this time is a reference value that allows the liquid cooling system 1 to operate normally under similar conditions in the differential pressure control mode. In other words, if the controller 10 controls the liquid cooling system 1 to operate in the differential pressure control mode based on the second set value 152, the liquid cooling system 1 can operate under the same or similar operating conditions as in the current flow control mode (e.g., the pump speed is the same or similar).

[0058] In this application, the controller 10 detects the flow rate of the coolant 2 based on a preset frequency. When the current flow rate reaches the first preset value 151, it detects the pressure difference and records / updates the second preset value 152. When the liquid cooling system 1 is operating normally (e.g., pump 141 is running) and the flow rate at the recovery liquid inlet 12 or the supply liquid outlet 11 is determined to be abnormal, the controller 10 switches the current control mode from flow control mode to pressure difference control mode, and controls at least one pump 141 to operate according to the last second preset value 152. The preset frequency can be, for example, every 100ms, every 1s, or every 5s, and is not limited thereto.

[0059] As described above, the controller 10 of this application continuously updates the second setpoint 152 (pressure differential value in this embodiment) when the liquid cooling system 1 is operating normally and the flow rate is normal. In other words, the second setpoint 152 is updated according to the condition of the liquid cooling system 1 / servo cabinet 3. In other words, the second setpoint 152 compensates for the actual condition of the liquid cooling system 1 through continuous updates, and therefore synchronizes with the flow rate to some extent. When the controller 10 instantly switches from flow control mode to pressure differential control mode due to an abnormal flow rate, although the control of the liquid cooling system 1 changes from being based on the flow rate to being based on the second setpoint 152, because the second setpoint 152 has already been compensated, the mode switch will not cause drastic fluctuations in the operation of the pump 141, and therefore will not affect the connected servo cabinet 3.

[0060] Compared to the above embodiments, when the controller 10 controls the liquid cooling system 1 to operate in differential pressure control mode, the controller 10 continuously monitors the pressure difference between the output and input terminals of the coolant 2. In one embodiment, the controller 10 detects a first pressure value of the coolant 2 at the supply liquid outlet 11 and a second pressure value of the coolant 2 at the recovery liquid inlet 12, and calculates the pressure difference between the first and second pressure values. The technical feature of this application is that when the pressure difference of the coolant 2 is detected to reach a preset first set value 151, the controller 10 obtains the current flow rate of the coolant 2 at the supply liquid outlet 11 or the flow rate of the coolant 2 at the recovery liquid inlet 12, and records this flow rate value as a second set value 152.

[0061] When the pressure difference of coolant 2 falls within the first set value 151, it indicates that the liquid cooling system 1 is operating normally in the differential pressure control mode. Therefore, the flow rate value at this time is a reference value that allows the liquid cooling system 1 to operate normally under similar conditions in the flow control mode. In other words, if the controller 10 controls the liquid cooling system 1 to operate in the flow control mode based on the second set value 152, the liquid cooling system 1 can operate under the same or similar operating conditions as in the current differential pressure control mode (e.g., the pump speed is the same or similar).

[0062] Similar to the aforementioned embodiments, in differential pressure control mode, the controller 10 can also detect and calculate the current pressure difference value based on a preset frequency. When the current pressure difference value is detected to reach the first set value 151, the flow rate value is detected and the second set value 152 is recorded / updated. When the liquid cooling system 1 is operating normally (e.g., the pump 141 is running) and the pressure difference value of the coolant 2 is determined to be abnormal, the controller 10 will switch the current control mode from differential pressure control mode to flow rate control mode, and control at least one pump 141 to operate according to the last second set value 152.

[0063] In this embodiment, the controller 10 continuously updates the second set value 152 (flow rate value in this embodiment) when the liquid cooling system 1 is operating normally and the pressure difference is normal. In other words, the second set value 152 is updated according to the condition of the liquid cooling system 1 / servo cabinet 3. In other words, the second set value 152 compensates for the actual condition of the liquid cooling system 1 through continuous updates, and therefore synchronizes with the pressure difference to some extent. When the controller 10 instantly switches from differential pressure control mode to flow control mode due to an abnormal pressure difference, it will not cause drastic fluctuations in the operation of the pump 141, and thus will not affect the connected servo cabinet 3.

[0064] like Figure 2 As shown, the liquid cooling system 1 of this application also includes a memory 15, a flow meter 16 and a differential pressure gauge 17, wherein the controller 10 is electrically connected to the memory 15, the flow meter 16 and the differential pressure gauge 17.

[0065] In one embodiment, the memory 15 may be implemented by flash memory, read-only memory, hard disk or any equivalent storage component, for recording the first set value 151 and the second set value 152.

[0066] In one embodiment, the flow meter 16 may be implemented by an ultrasonic flow meter, an electromagnetic flow meter, a turbine flow meter, a Coriolis mass flow meter, or a positive displacement flow meter to detect the flow rate of coolant 2 inside, at the output end, or at the input end of the liquid cooling system 1.

[0067] In one embodiment, the differential pressure gauge 17 includes at least a first pressure sensor and a second pressure sensor. The differential pressure gauge 17 detects a first pressure value of the coolant 2 at the output end using the first pressure sensor and a second pressure value of the coolant 2 at the input end using the second pressure sensor. Then, the controller 10 or the differential pressure gauge 17 calculates the difference between the first pressure value and the second pressure value as the pressure difference value.

[0068] Please refer to the following for further details. Figures 1 to 3 ,in Figure 3 This is a first embodiment of the control method flowchart for the liquid cooling system of this application. Figure 3 The control program for anomalies occurring when the liquid cooling system 1 of this application is operating in flow control mode is disclosed.

[0069] In this application, the first set value 151 recorded in the memory 15 of the liquid cooling system 1 corresponds to the initial control parameters of the flow control mode. For example... Figure 3 As shown, after the liquid cooling system 1 is started, the controller 10 controls the liquid cooling system 1 to operate in flow control mode (step S31). Furthermore, the controller controls at least one pump 141 of the water tank 14 to operate based on a first set value 151 to deliver coolant 2, and controls multiple fans 131 of the radiator 13 to rotate to cool the coolant 2 (step S32). In this application, the liquid cooling system 1 inputs the cooled coolant 2 to the server rack 3 through the liquid supply outlet 11, and receives the cooled coolant 2 from the server rack 3 through the liquid recovery inlet 12.

[0070] While the liquid cooling system 1 continuously supplies and recovers coolant 2, the controller 10 determines whether the flow rate of coolant 2 has reached a preset first set value 151 (step S33). Furthermore, when the controller 10 determines that the flow rate of coolant 2 has reached the first set value 151, it obtains the pressure difference between the coolant 2 at the supply liquid outlet 11 and the coolant 2 at the recovery liquid inlet 12, and records it as a second set value 152 (step S34).

[0071] In one embodiment, the controller 10 can set an error range for a first set value 151. The error range may include a positive error value and a negative error value. For example, the first set value 151 is 130 lpm (liters per minute), with a positive error value of +5 lpm and a negative error value of -5 lpm. In this embodiment, the controller 10 determines that the flow rate of the coolant 2 has reached the first set value 151 when the flow rate falls within the error range of the first set value 151 (i.e., 125 lpm to 135 lpm).

[0072] In this application, the controller 10 obtains the flow rate value based on a preset measurement frequency. When the flow rate value falls within the error range of the first set value 151, it obtains the current pressure difference of the coolant 2 (e.g., 100 kPa) and updates the second set value 152. If the controller 10 determines that the flow rate value exceeds the error range of the first set value 151, the controller 10 may either not obtain the pressure difference value, or obtain the pressure difference value but not update the second set value 152. More specifically, when the flow rate value detected by the flow meter 16 exceeds the error range of the first set value 151, it only indicates that the liquid cooling system 1 is currently unstable, but the flow meter 16 is not faulty, and the flow rate value may return to normal after a period of time. Therefore, when the flow rate value exceeds the error range of the first set value 151, the controller 10 only pauses updating the second set value 152, but does not immediately switch the control mode.

[0073] Next, the controller 10 determines whether the flow rate of the coolant 2 is abnormal according to a preset frequency (step S35). If the flow rate is not abnormal, the controller 10 returns to step S32 to continuously deliver the coolant 2, continuously measure the flow rate, and continuously update the second set value 152. In one embodiment, the controller 10 determines that the flow meter 16 is faulty and the abnormal flow rate is caused when the pump 141 is operating normally but the flow rate is abnormal (e.g., the obtained flow rate is zero, or the flow rate exceeds the normal detection range of the flow meter 16).

[0074] If the flow rate is determined to be abnormal in step S35, the controller 10 immediately switches the liquid cooling system 1 from flow control mode to differential pressure control mode (step S36), and in differential pressure control mode, controls the pump 141 to operate according to the last updated second setpoint 152 (step S37). Thus, the controller 10 can switch the control mode of the liquid cooling system 1 without causing drastic fluctuations, thereby resolving the problem that the flow meter 16 might malfunction or fail, potentially leading to unstable coolant delivery if it continues to operate in flow control mode.

[0075] Please refer to the following for further details. Figure 1 , Figure 2 and Figure 4 ,in Figure 4 This is a second embodiment of the control method flowchart for the liquid cooling system of this application. Figure 4 The control program for anomalies occurring when the liquid cooling system 1 of this application is operating in differential pressure control mode is disclosed.

[0076] At Figure 4In the second embodiment, the first set value 151 recorded in the memory 15 of the liquid cooling system 1 corresponds to the initial control parameters of the differential pressure control mode. In the second embodiment, the controller 10 controls the liquid cooling system 1 to operate in the differential pressure control mode after the liquid cooling system 1 is started (step S41).

[0077] In one embodiment, the user can set the liquid cooling system 1 to operate in flow control mode or differential pressure control mode via a human-machine interface (not shown) before or after startup. In another embodiment, the liquid cooling system 1 can be preset to operate in flow control mode or differential pressure control mode. In yet another embodiment, the controller 10 can detect and evaluate the execution environment after the liquid cooling system 1 is started to determine whether the liquid cooling system 1 should operate in flow control mode or differential pressure control mode.

[0078] In differential pressure control mode, the controller controls at least one pump 141 to operate to deliver coolant 2 based on a first set value 151, and controls multiple fans 131 to rotate to cool the coolant 2 (step S42). When the liquid cooling system 1 delivers and recovers coolant 2, the controller 10 continuously determines whether the pressure difference of coolant 2 reaches the preset first set value 151 (step S43). Furthermore, when the controller 10 determines that the pressure difference of coolant 2 has reached the first set value 151, it obtains the current flow rate of coolant 2 at the supply liquid outlet 11 or the flow rate of coolant 2 at the recovery liquid inlet 12, and records this flow rate as a second set value 152 (step S44).

[0079] Similar to the first embodiment described above, the controller 10 can set an error range for the first set value 151 in the differential pressure control mode, and when the pressure difference of the coolant 2 falls within the error range of the first set value 151 (for example, the first set value 151 is 100 kPa and the error range is ±5 kPa), it determines that the pressure difference has reached the first set value 151.

[0080] Similar to the first embodiment described above, in differential pressure control mode, the controller 10 can obtain the pressure difference value according to a preset measurement frequency, and when it determines that the pressure difference value falls within the error range of the first set value 151, it obtains the current flow rate value of the coolant 2 and updates the second set value 152. If the controller 10 determines that the pressure difference value exceeds the error range of the first set value 151, the controller 10 may not obtain the flow rate value, or obtain the flow rate value but not update the second set value 152.

[0081] In the second embodiment, the controller 10 also determines whether the pressure difference of the coolant 2 is abnormal according to a preset frequency (step S45). If the pressure difference is not abnormal, the controller 10 returns to step S42 to continuously deliver coolant 2, continuously measure the pressure difference, and continuously update the second set value 152. In one embodiment, the controller 10 determines that the differential pressure gauge 17 is faulty and causes the abnormal pressure difference when the pump 141 is operating normally but the pressure difference is abnormal (for example, the obtained pressure difference exceeds the normal detection range of the differential pressure gauge 17).

[0082] If the flow rate is determined to be abnormal in step S45, the controller 10 immediately switches the liquid cooling system 1 from differential pressure control mode to flow control mode (step S46), and in flow control mode, controls the pump 141 to operate according to the last updated second setting value 152 (step S47). Thus, the controller 10 can switch the control mode of the liquid cooling system 1 without causing drastic fluctuations, thereby resolving the problem that the coolant 2 might not be stably delivered if the differential pressure gauge 17 continues to operate in differential pressure control mode due to malfunction or failure.

[0083] Please see below. Figure 5 This is a second embodiment of the liquid cooling system of this application. To detect the flow rate and pressure difference of the coolant 2, the liquid cooling system 1 must be equipped with a flow meter 16 and a differential pressure gauge 17 on the pipeline. For example... Figure 5 As shown, in one embodiment, the flow meter 16 may be positioned near the supply liquid outlet 11 to detect the flow rate of the coolant 2 at the supply liquid outlet 11. In another embodiment, the flow meter 16 may be positioned near the recovery liquid inlet 12 to detect the flow rate of the coolant 2 at the recovery liquid inlet 12.

[0084] In another embodiment, the liquid cooling system 1 may be configured with two flow meters 16, respectively located near the supply liquid outlet 11 and near the recovery liquid inlet 12. Thus, the liquid cooling system 1 can simultaneously detect the flow rate of the coolant 2 at the supply liquid outlet 11 and the flow rate of the coolant 2 at the recovery liquid inlet 12, and the controller 10 can selectively use one of the two flow rates for judgment, or calculate the average of the two flow rates for judgment.

[0085] In addition, such as Figure 5As shown, the differential pressure gauge 17 of the liquid cooling system 1 can be installed at the supply liquid outlet 11 and the recovery liquid inlet 12. More specifically, the liquid cooling system 1 can be equipped with a single differential pressure gauge 17, and the two detection terminals of the differential pressure gauge 17 are respectively installed at the supply liquid outlet 11 and the recovery liquid inlet 12, thereby detecting the first pressure value of the coolant 2 at the supply liquid outlet 11 and the second pressure value of the coolant 2 at the recovery liquid inlet 12, and then calculating the pressure difference between the first pressure value and the second pressure value.

[0086] In another embodiment, the differential pressure gauge 17 includes two pressure sensors. The liquid cooling system 1 sets the two pressure sensors at the supply liquid outlet 11 and the recovery liquid inlet 12, respectively. The first pressure sensor detects the first pressure value of the coolant 2 at the supply liquid outlet 11, and the second pressure sensor detects the second pressure value of the coolant 2 at the recovery liquid inlet 12. The controller 10 or the differential pressure gauge 17 then calculates the pressure difference between the first pressure value and the second pressure value.

[0087] When the liquid cooling system is operating stably in flow control mode or differential pressure control mode, this application updates and compensates the initial control parameters of the other control mode based on the current state of the liquid cooling system. As a result, the liquid cooling system will not experience large fluctuations after the control mode is switched, thereby maintaining system stability and avoiding the impact on the servo cabinet connected to the liquid cooling system due to sensor failure inside the liquid cooling system.

Claims

1. A liquid cooling system for cooling a servo cabinet, comprising: Supply liquid outlet, connected to the liquid inlet of the servo cabinet; The liquid inlet is connected to the liquid outlet of the servo cabinet; A radiator, including multiple fans, wherein the radiator is configured to receive coolant from the server rack after its temperature rises via the recycled liquid inlet, and to operate the multiple fans to cool the coolant; A water tank, including at least one pump, wherein the water tank is configured to operate the at least one pump to input the cooled coolant from the supply liquid outlet to the servo cabinet; as well as The controller is configured to detect the flow rate of the coolant at the recovery liquid inlet or the supply liquid outlet, and to record the pressure difference between the supply liquid outlet and the recovery liquid inlet as a second set value when the flow rate reaches a first set value. The liquid cooling system operates in flow control mode, and the controller is configured to switch to differential pressure control mode when the flow value of the recovered liquid inlet or the supplied liquid outlet is abnormal during the operation of the at least one pump, and control the operation of the at least one pump according to the second set value.

2. The liquid cooling system of claim 1, further comprising a flow meter disposed near the supply liquid outlet or near the recovery liquid inlet, configured to detect the flow rate of the coolant.

3. The liquid cooling system according to claim 1, further comprising at least one differential pressure gauge disposed at the supply liquid outlet and the recovery liquid inlet, configured to detect the pressure difference.

4. The liquid cooling system according to claim 1, wherein the controller is configured to determine that the flow rate has reached the first set value when the flow rate falls within the error range of the first set value.

5. The liquid cooling system of claim 4, wherein the controller is configured to obtain the flow rate value based on the measurement frequency, obtain the current pressure difference value and update the second set value when the flow rate value falls within the error range of the first set value, and not update the second set value when the flow rate value exceeds the error range of the first set value.

6. The liquid cooling system of claim 1, wherein the controller is configured to determine that the flow value is abnormal when the pump is operating normally but the flow value is zero, or when the flow value exceeds the normal detection range of the flow meter.

7. A liquid cooling system for cooling a servo cabinet, comprising: Supply liquid outlet, connected to the liquid inlet of the servo cabinet; The liquid inlet is connected to the liquid outlet of the servo cabinet; A radiator, including multiple fans, wherein the radiator is configured to receive coolant from the server rack after its temperature rises via the recycled liquid inlet, and to operate the multiple fans to cool the coolant; A water tank, including at least one pump, wherein the water tank is configured to operate the at least one pump to input the cooled coolant from the supply liquid outlet to the servo cabinet; as well as The controller is configured to detect the pressure difference between the coolant at the recovery liquid inlet and the supply liquid outlet, and to record the flow rate of the coolant at the supply liquid outlet or the recovery liquid inlet as a second set value when the pressure difference reaches a first set value. The liquid cooling system operates in differential pressure control mode, and the controller is configured to switch to flow control mode when the at least one pump is operating and the differential pressure value is determined to be abnormal, and to control the operation of the at least one pump according to the second set value.

8. The liquid cooling system of claim 7, further comprising at least one differential pressure gauge disposed at the supply liquid outlet and the recovery liquid inlet, configured to detect the pressure difference.

9. The liquid cooling system of claim 7, further comprising a flow meter disposed near the supply liquid outlet or near the recovery liquid inlet, configured to detect the flow rate of the coolant.

10. The liquid cooling system of claim 7, wherein the controller is configured to determine that the pressure difference has reached the first set value when the pressure difference falls within the error range of the first set value.

11. The liquid cooling system of claim 10, wherein the controller is configured to obtain the pressure difference value based on the measurement frequency, obtain the current flow rate value and update the second set value when the pressure difference value falls within the error range of the first set value, and not update the second set value when the pressure difference value exceeds the error range of the first set value.

12. The liquid cooling system of claim 7, wherein the controller is configured to determine that the pressure difference is abnormal when the pressure difference exceeds the normal detection range of the differential pressure gauge used to detect the pressure difference.

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