Liquid cooling system and online liquid replacement method

Abstract

The present application discloses a liquid cooling system and an online liquid replacement method, wherein the liquid cooling system includes: a primary cooling system and a secondary cooling system, and the primary cooling system and the secondary cooling system perform heat exchange through a heat exchanger; the secondary cooling system includes: a heat dissipation circulation loop formed with the hot side of the heat exchanger, and an online liquid replacement loop is arranged on the pipeline forming the heat dissipation circulation loop; the online liquid replacement loop is used to replace the medium in the secondary cooling system. The liquid cooling system is provided with an online liquid replacement loop on the pipeline of the secondary cooling system, thereby realizing liquid replacement of the secondary cooling system without stopping the machine, and ensuring the continuous efficient, reliable and stable operation of the host.

Description

Technical Field

[0001] The present disclosure generally relates to the technical field of liquid cooling systems, and in particular to a liquid cooling system and an online liquid replacement method. Background Art

[0002] The server side of the secondary side of the liquid cooling system has strict requirements on water quality. It is necessary to monitor the conductivity, turbidity and pH value of the secondary side water online or conduct regular inspections to timely understand the secondary side water quality and prevent server downtime due to water quality problems.

[0003] However, the existing shutdown for water replacement will cause the client and server to be unable to use normally, resulting in unstable or even interrupted operation of the client and server. Therefore, there is an urgent need for a liquid cooling system that can ensure that the server is not affected and can replace the secondary side medium. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a liquid cooling system and an online liquid replacement method.

[0005] In a first aspect, the present application provides a liquid cooling system, comprising: a primary cooling system and a secondary cooling system, wherein heat exchange is performed between the primary cooling system and the secondary cooling system via a heat exchanger; the secondary cooling system comprises: a heat dissipation circulation loop formed with the hot side of the heat exchanger, an online liquid exchange circuit being arranged on the pipeline forming the heat dissipation circulation loop; the online liquid exchange circuit is used to replace the medium in the secondary cooling system.

[0006] According to the technical solution provided by the present application, the heat dissipation circulation loop at least includes:

[0007] A first main pipe connected to a first end of the hot side of the heat exchanger, wherein a first check valve, a first regulating valve, a circulating pump group and a second regulating valve are sequentially connected to the first main pipe;

[0008] A second main pipe is connected to the second end of the hot side of the heat exchanger, and a third regulating valve and a drain valve are sequentially connected to the second main pipe.

[0009] According to the technical solution provided in this application, the online liquid exchange circuit includes:

[0010] a liquid replenishing tank, the liquid replenishing tank being in communication with the first main pipeline through a first pipeline; one end of the first pipeline is connected to the liquid replenishing tank, and the connection point of the other end of the first pipeline with the first main pipeline is located between the circulation pump group and the second regulating valve, for replenishing liquid to the heat dissipation circulation loop;

[0011] The first pipeline is also provided with a liquid replenishing pump and a first ball valve.

[0012] According to the technical solution provided in the present application, the top of the fluid replenishment tank is provided with a liquid injection port, and the liquid injection port is used to inject liquid into the interior of the fluid replenishment tank;

[0013] The side wall of the fluid replenishment tank is also provided with a sight glass and a liquid level sensor is arranged inside the sight glass, the sight glass is used to observe the liquid level changes in the fluid replenishment tank; the liquid level sensor is used to monitor the liquid level in the fluid replenishment tank and generate a liquid level signal.

[0014] According to the technical solution provided in the present application, a filter is further provided on the second main pipe, one end of the filter is connected to the third regulating valve, and the other end of the filter is connected to the drain valve.

[0015] According to the technical solution provided by the present application, the heat dissipation circulation loop includes a branch pipeline, one end of which is connected to the first main pipeline, and the connection port enables the branch pipeline to communicate with the second regulating valve;

[0016] The other end of the branch pipeline is connected to the second main pipeline, and the connection port enables the branch pipeline to communicate with the third regulating valve;

[0017] The branch pipeline is provided with a first electric two-way valve.

[0018] According to the technical solution provided in the present application, the first main line and the second main line also include a plurality of temperature sensors and pressure sensors, and the temperature sensors and the pressure sensors are respectively used to collect pressure values ​​and temperature values ​​at various locations in the liquid cooling system.

[0019] In a second aspect, the present application provides an online liquid replacement method, which is applied to the liquid cooling system described above, and the online liquid replacement method comprises:

[0020] S100, sending a first control instruction to the first ball valve, where the first control instruction is used to close the first ball valve;

[0021] S200, after the online liquid exchange circuit and the liquid drain valve are set according to preset requirements, control the liquid drain valve to open to a preset opening to drain liquid;

[0022] S300, controlling the liquid infusion pump to operate and opening the first ball valve to inject liquid into the first main pipeline through the first pipeline;

[0023] S400, monitoring the water inlet pressure value of the circulation pump group in real time, and adjusting the real-time opening of the drain valve according to the water inlet pressure value;

[0024] S500, obtaining the liquid injection volume of the secondary cooling system, and when the preset liquid replacement volume is reached, closing the drain valve and the liquid replenishing pump.

[0025] According to the technical solution provided by the present application, after closing the drain valve and the refill pump, the method further includes:

[0026] S600, adjusting the water inlet pressure value of the circulation pump group to a preset pressure value.

[0027] According to the technical solution provided by the present application, after adjusting the water inlet pressure value of the circulation pump group to a preset pressure value, the method further includes:

[0028] S700, after the liquid cooling system has been running for a preset time, liquid is collected at a liquid discharge port of the liquid cooling system, and the extracted liquid to be tested is tested;

[0029] S800, judging whether the liquid to be tested is qualified, if not qualified, executing step S900;

[0030] S900, repeating steps S200 to S800 until the re-extracted liquid to be tested is qualified.

[0031] In summary, the present technical solution specifically discloses a liquid cooling system and an online liquid exchange method, wherein the liquid exchange system comprises: a primary side cooling system and a secondary side cooling system, and heat exchange is performed between the primary side cooling system and the secondary side cooling system through a heat exchanger; the secondary side cooling system comprises: a heat dissipation circulation loop formed with the hot side of the heat exchanger, and an online liquid exchange loop is arranged on the pipeline forming the heat dissipation circulation loop; the online liquid exchange loop is used to replace the medium in the secondary side.

[0032] The existing shutdown for water change will cause the client and server to not be used normally, which can easily lead to abnormal operation of the client and server. In addition to the heat dissipation circulation loop formed with the hot side of the heat exchanger in the secondary cooling system of the present application, an online liquid exchange loop is also provided on the pipeline of the heat dissipation circulation loop; the online liquid exchange can replace the medium in the secondary cooling system without shutting down the machine, which can not only monitor the medium status in the secondary cooling system, but also ensure the normal use of the client and server. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0034] Figure 1 This is a schematic diagram of the primary side structure of a liquid cooling system.

[0035] Figure 2 A schematic diagram of the secondary side structure of a liquid cooling system.

[0036] Figure 3 Schematic diagram of a process of online liquid replacement method.

[0037] Numbers in the figure: 1. heat exchanger; 2. first main line; 3. first non-return valve; 4. first regulating valve; 5. circulation pump group; 6. second regulating valve; 7. second main line; 8. third regulating valve; 9. drain valve; 10. first pipeline; 11. replenishing pump; 12. first ball valve; 13. filter; 14. fourth regulating valve; 15. branch pipeline; 16. first electric two-way valve; 17. replenishing tank; 18. filling port; 19. sight glass; 20. low liquid level sensor; 21. third main line; 22. fourth main line; 23. automatic exhaust valve; 24. second electric two-way valve; 25. expansion tank; 26. first flow meter; 27. second flow meter; 28. safety valve. DETAILED DESCRIPTION

[0038] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0039] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] Example 1

[0041] Please refer to Figure 1 and Figure 2 The embodiment shown in the figure shows a schematic diagram of the primary and secondary side structures of a liquid cooling system, wherein the liquid cooling system comprises: a primary cooling system and a secondary cooling system, and heat exchange is performed between the primary cooling system and the secondary cooling system via a heat exchanger 1;

[0042] The secondary cooling system comprises: a heat dissipation circulation loop formed with the hot side of the heat exchanger, and an online fluid replacement loop is arranged on the pipeline forming the heat dissipation circulation loop; the online fluid replacement loop is used to replace the medium in the secondary cooling system.

[0043] In this embodiment, the liquid cooling system includes a primary-side cooling system connected to the cold side of the heat exchanger 1 and a secondary-side cooling system connected to the hot side of the heat exchanger 1; wherein the secondary-side cooling system can be used to absorb the heat generated by the server side, and absorb the heat from the server side by exchanging heat with the primary-side cooling system at the heat exchanger 1, so as to cool the server side; here, the type of heat exchanger 1 can be a plate heat exchanger.

[0044] The entire liquid cooling system is circulated with a heat exchange medium, such as coolant. At the same time, the water quality of the coolant in the secondary cooling system will also affect the operation of the entire server. Therefore, it is necessary to replace the medium in the secondary cooling system in time, that is, to replace the liquid in the secondary cooling system.

[0045] In order to avoid the situation where the server host cannot be used normally due to the existing shutdown and fluid replacement methods, and to ensure the host's continued efficient, reliable and stable operation, an online fluid replacement circuit is provided on the pipeline forming the heat dissipation circulation loop to realize the online fluid replacement function.

[0046] In a preferred embodiment, see Figure 2 , the heat dissipation circulation loop at least includes:

[0047] A first main pipe 2 connected to a first end of the hot side of the heat exchanger 1, wherein a first check valve 3, a first regulating valve 4, a circulation pump set 5 and a second regulating valve 6 are sequentially connected to the first main pipe 2;

[0048] See also Figure 2 , if the arrangement positions of the components during actual installation are ignored, it is equivalent to that the first non-return valve 3, the first regulating valve 4, the circulating pump group 5 and the second regulating valve 6 are connected in sequence in the direction away from the heat exchanger 1; the first non-return valve 3 is used to control the flow direction of the medium in the first main pipeline 2; the first regulating valve 4 and the second regulating valve 6 can be butterfly valves, which are used to control the flow of the medium in the first main pipeline 2; the circulating pump group 5 is used to pump the medium for liquid replacement into the first main pipeline 2;

[0049] Here, the circulating pump group 5 includes two circulating water pumps, so that the single pump or dual-mode mode can be selected, but it should be noted that when the dual-pump mode is selected, the two circulating water pumps are also a standby water pump and an execution water pump.

[0050] The dual pump mode can cope with some emergencies. For example, when the executive water pump directly installed on the first main pipeline 2 fails, the backup water pump (the water pump in the dotted box) can be activated in time. Here, the backup water pump and the executive water pump are in "parallel" state. The backup water pump is connected in parallel with the executive water pump through a one-way valve. For specific connection methods, see Figure 2 .

[0051] A second main pipe 7 is connected to the second end of the hot side of the heat exchanger 1 , and a third regulating valve 8 and a drain valve 9 are sequentially connected to the second main pipe 7 .

[0052] Similarly, if the arrangement position of the components during actual installation is ignored, it is equivalent to that the third regulating valve 8 and the drain valve 9 are connected sequentially in a direction away from the heat exchanger 1; the third regulating valve 8 can also be a butterfly valve, and the drain valve 9 is used to discharge the medium in the secondary cooling system to the outside through an external drain pipe.

[0053] It should be noted that the heat dissipation circulation loop is mainly connected to the two ports on the hot side of the heat exchanger 1, but in essence there is no difference between the first and second ports. For the convenience of introduction, the first end and the second end are used to distinguish them. In addition, the formation of the heat dissipation circulation loop also depends on the server side, so that the first main line 2 and the second main line 7 constitute a complete heat dissipation loop for absorbing the heat of the server side. The server side is equivalent to being connected to the end of the first main line 1 and the second main line 7 that is not connected to the heat exchanger 1. Generally, the server-side host is placed in a cabinet where a medium can flow, and the medium takes away the heat generated by the operation of the host during the circulation process.

[0054] In a preferred implementation, see Figure 2 , the online liquid replacement circuit comprises:

[0055] A liquid replenishing tank 17, the liquid replenishing tank 17 is connected to the first main line 2 through the first pipeline 10; one end of the first pipeline 10 is connected to the liquid replenishing tank 17, and the connection point of the other end of the first pipeline 10 and the first main line 2 is located between the circulation pump group 5 and the second regulating valve 6, for replenishing liquid to the heat dissipation circulation loop;

[0056] The first pipeline 10 is also provided with a liquid replenishing pump 11 and a first ball valve 12 .

[0057] The replenishing tank 17 is the main replenishing component in the online liquid exchange circuit, and contains a medium for replacing the liquid in the secondary cooling system. The medium in the replenishing tank 17 is transported to the first main line 2 with the cooperation of the replenishing pump 11, the first ball valve 12 and the circulating pump group 5. At the same time, in order to prevent the backflow of the medium, a one-way valve is also arranged between the first ball valve 12 and the replenishing pump 11.

[0058] For the flow direction of the medium, see Figure 1 and Figure 2 The arrow in the .

[0059] In a preferred embodiment, see Figure 2 The top of the liquid replenishing tank 17 has a liquid injection port 18, and the liquid injection port 18 is used to inject liquid into the interior of the liquid replenishing tank 17;

[0060] The side wall of the fluid replenishment tank 17 is also provided with a sight glass 19 and a liquid level sensor 20 is arranged inside the sight glass 19, the sight glass 19 is used to observe the liquid level changes in the fluid replenishment tank 17; the liquid level sensor 20 is used to monitor the liquid level in the fluid replenishment tank 17 and generate a liquid level signal.

[0061] The replenishing tank 17 is mainly used for replenishing the secondary cooling system. Generally, pure water can be used as the liquid replacement medium. The liquid level sensor 20 here can collect the liquid level data in the replenishing tank 17 in real time to ensure that there is a continuous water source when the replenishing tank 17 is performing replenishing operations, thereby avoiding water shortage in the replenishing tank 17; generally, the liquid level sensor 20 will be set near the bottom of the replenishing tank 17.

[0062] In a preferred embodiment, see Figure 2 , a filter 13 is also provided on the second main pipe 7, one end of the filter is connected to the third regulating valve, and the other end of the filter is connected to the drain valve;

[0063] See also Figure 2 If the arrangement position of the components during actual installation is ignored, the filter 13 is located between the third regulating valve 8 and the drain valve 9 , and a fourth regulating valve 14 is also provided between the filter 13 and the drain valve 9 .

[0064] The filter 13 is used to filter out particulate impurities in the medium circulating in the heat dissipation circulation loop. The filter 13 can filter out abnormalities in the medium through the filter structure arranged inside it. In order to ensure the stability of the system pressure, a pressure sensor can be arranged on the side of the filter 13 close to the heat exchanger 1 to monitor the pressure before the filter 13.

[0065] In a preferred embodiment, see Figure 2 The heat dissipation circulation loop includes a branch pipeline 15, one end of which is connected to the first main pipeline 2, and the connection port enables the branch pipeline to communicate with the second regulating valve, which is equivalent to the connection port being located on the side of the second regulating valve 6 away from the circulation pump group 5;

[0066] The other end of the branch pipeline 15 is connected to the second main pipeline 7, and the connection port enables the branch pipeline to communicate with the third regulating valve, which is equivalent to the connection port being located at one end of the third regulating valve 8 close to the heat exchanger 1;

[0067] The branch pipeline 15 is provided with a first electric two-way valve 16 .

[0068] Specifically, the first electric two-way valve 16 can adjust the medium flow rate through the liquid supply pressure sensor and the liquid return pressure sensor of the secondary cooling system, wherein the control method of the secondary flow rate mainly includes:

[0069] The difference between [secondary supply pressure - secondary return pressure] is used as the control target and the secondary flow rate is used as the control target. The CDU secondary flow rate and the supply and return pressure differential are adjusted by changing the pump frequency of the circulation pump group 5 and the opening of the bypass valve.

[0070] (1) The control target parameter is the secondary side supply and return hydraulic pressure difference

[0071] When pressure differential control is selected, if the actual value of the secondary side supply and return hydraulic pressure differential is less than the set value - lower deviation, the secondary side bypass valve will be closed first. If the bypass valve is fully closed, the pump frequency will increase; if the actual value of the secondary side supply and return hydraulic pressure differential is greater than the set value + upper deviation, the corresponding device will act in the opposite way; if the set value - lower deviation is less than the actual value of the secondary side supply and return hydraulic pressure differential is less than the set value + upper deviation, the secondary side load remains unchanged.

[0072] (2) The second control target parameter is the secondary side flow

[0073] When flow control is selected, the pump adjusts the speed according to the target flow. When the actual flow is greater than the set value + deviation value, if the pump operating frequency has not reached the lower limit, the pump frequency will decrease. If the pump has reached the lower limit operating frequency, the bypass valve will be opened; when the actual flow is less than the set value - deviation value, if the secondary bypass water valve is not fully closed, the valve will be closed; if the secondary bypass water valve is fully closed, the pump frequency will increase. If the set value - deviation value < actual flow < set value + deviation value, each load remains unchanged. This regulation mechanism is mainly to maintain the pressure balance in the system and ensure that the fluid flows and is controlled according to the preset requirements. This regulation mechanism is mainly to maintain the pressure balance in the system and ensure that the fluid flows and is controlled according to the preset requirements.

[0074] The liquid supply pressure sensor and liquid return pressure sensor here can be found in detail. Figure 2 The two rightmost groups of sensors (the sensors in the dotted box are optional parts and are also used as spare parts in the actual process), among which the temperature sensor and pressure sensor on the first main line 2 are used to monitor the return liquid pressure and return liquid temperature; and the temperature sensor and pressure sensor on the second main line 7 are used to monitor the supply liquid pressure and supply liquid temperature. The main function of these sensors is also to monitor the real-time pressure and temperature in the system and send signals when they deviate from the set values, thereby controlling the first electric two-way valve 16 to adjust the valve opening degree according to the preset control logic.

[0075] In a preferred embodiment, see Figure 2The first main line 2 and the second main line 7 also include a plurality of temperature sensors and pressure sensors, which are used to collect pressure values ​​and temperature values ​​at various locations in the liquid cooling system, respectively; in addition, an automatic exhaust valve 23 and a safety valve 28 are also included, wherein the temperature sensor can be found in Figure 2 The circle in the figure contains a T symbol. For pressure sensors, see Figure 2 The circle contains a P symbol.

[0076] The temperature sensor, pressure sensor, automatic exhaust valve 23 and safety valve 28 are all used to ensure and monitor the safety of the liquid cooling system. They can promptly detect whether the liquid cooling system is over-pressurized or overheated. The data collection and data presentation of these sensors can be updated in real time through the large-screen interface of the liquid cooling system control end. The liquid cooling system control end is the central control machine. The liquid cooling system control end is used to monitor various collected data (pressure values ​​at various locations in the system). At the same time, it is also necessary to control the valve operating conditions by analyzing these data, such as opening, closing or adjusting the opening, etc.

[0077] It should be noted that a pressure sensor is provided at the front and rear ends of the circulation pump group 5, and the collected data are the water outlet pressure value (the pressure sensor provided near the first regulating valve 3) and the water inlet pressure value (the pressure sensor provided near the second regulating valve 6).

[0078] In a preferred embodiment, see Figure 2 An expansion tank 25 and a first flow meter 26 are also provided on the first main line 2. Specifically, the expansion tank 25 is located on a side of the second regulating valve 6 away from the circulation pump group 5, and the first flow meter 26 is located on a side of the expansion tank 25 away from the second regulating valve 6.

[0079] The first flow meter 26 is used to monitor the liquid flow of the secondary cooling system, and the expansion tank 25 is used to stabilize the pressure of the liquid cooling system.

[0080] In a preferred embodiment, see Figure 1 Since the primary cooling system is mainly responsible for the refrigeration cycle of the entire liquid cooling system, the primary cooling system includes: a third main line 21 and a fourth main line 22 connected to the third end of the cold side of the heat exchanger 1,

[0081] A second electric two-way valve 24 and a corresponding regulating valve are sequentially arranged on the third main line 21 in a direction away from the heat exchanger 1 .

[0082] An automatic exhaust valve, a second flow meter 27 and a corresponding regulating valve are sequentially arranged on the fourth main line 22 in a direction away from the heat exchanger 1 .

[0083] It should be noted that the pipeline of the primary cooling system is also provided with a number of pressure sensors and temperature sensors. Figure 1 Meanwhile, the two ports on the cold side of the heat exchanger 1 are essentially not the third and fourth ports, but for ease of description, the third and fourth ports are used to distinguish them.

[0084] Example 2

[0085] See also Figure 3 Based on the online liquid replacement system of a liquid cooling system shown in Example 1, the present application embodiment provides an online liquid replacement method for a cooling system, which specifically includes the following steps:

[0086] S100, sending a first control instruction to the first ball valve 12, where the first control instruction is used to close the first ball valve 12;

[0087] First, close the first ball valve 12. The first control instruction can be issued by the control end of the online liquid replacement system of the liquid cooling system to close the first ball valve 12 to facilitate the operation of subsequent steps.

[0088] S200, after the online liquid exchange circuit and the drain valve 9 are set according to the preset requirements, the drain valve 9 is controlled to open to a preset opening to drain the liquid;

[0089] The preset opening can be selected between 10% and 20%. The setting of the preset opening can avoid the phenomenon that the system pressure fluctuates greatly or even stops due to the delay in opening the injection tooling.

[0090] The preset requirements here refer to the structural changes that need to be made for the subsequent system to drain and inject fluid, for example, removing the clamp that fixes the outlet pipe of the infusion pump 11 to the infusion port (the interface between the infusion pump 11 and the first main line 2 is the infusion port), and slowly pulling out the outlet hose of the infusion pump 11 from the pagoda head, connecting and fixing the water outlet of the online fluid exchange and injection tooling to the infusion port, and connecting and fixing one end of the drain pipe to the drain port of the inner ring network of the secondary cooling system. The drain port is the port for discharging liquid from the secondary cooling system, and the drain valve 9 is provided at this port; the drain pipe is used to discharge the medium of the secondary cooling system to the outside. When the drain valve 9 is open, the medium inside the secondary cooling system can flow out from the drain port and be discharged to the outside of the system through the drain pipe.

[0091] S300, controlling the liquid infusion pump 11 to operate and opening the first ball valve 12 to inject liquid into the first main pipeline 2 through the first pipeline 10;

[0092] After the drain valve 9 is opened, it means that the secondary cooling system has begun to drain through the drain pipe, so the replenishing pump 11 can be turned on, and the replenishing tank 17 replenishes the secondary cooling system with fluid. At this time, the secondary cooling system is in a state of draining and filling at the same time.

[0093] S400, monitoring the water inlet pressure value of the circulation pump group 5 in real time, and adjusting the real-time opening of the drain valve 9 according to the water inlet pressure value;

[0094] The parameters that need to be paid attention to during the entire liquid exchange process are mainly the pressure and flow fluctuation during the liquid exchange. Since the entire liquid cooling system includes multiple pressure sensors, during the liquid exchange process, generally, the system minimum flow is 224.5L / min, the maximum can reach 233.5L / min, and the flow fluctuation is 9L / min, which is a normal fluctuation and will not affect the normal operation of the system. However, in the early stage of heat exchange, the system pressure cannot be balanced due to the inability to maintain balance between drainage and discharge. Therefore, it is necessary to control the opening of the drain valve 9 at this time to avoid excessive drainage, which will cause the system pressure to drop too much and cause the liquid cooling system to shut down.

[0095] An example of a specific control process is to obtain the target flow value of the medium in the secondary cooling system at this time, and determine the target opening value of the drain valve 9 corresponding to the current water inlet pressure value; adjust the current opening of the drain valve 9 to another opening value, and calculate the actual flow value flowing through the drain valve 9 and the real-time change of the water inlet pressure value, collect multiple groups of sample data as training sets to train and test the neural network, and obtain a model that can control the opening of the drain valve 9 according to the water inlet pressure value. At the same time, during the opening control process, the flow change can also be displayed in real time at the control end of the online liquid exchange system of the liquid cooling system, so that the technicians can monitor the liquid exchange efficiency in real time.

[0096] S500, obtaining the liquid injection volume of the secondary cooling system, and when the preset liquid replacement volume is reached, closing the drain valve 9 and the liquid replenishing pump 11.

[0097] The preset fluid replacement amount is set based on the actual volume of the secondary cooling system. When the fluid replacement amount reaches the actual volume of the secondary cooling system, the injection and drainage can be stopped.

[0098] The amount of liquid replacement can be collected by the first flow meter 26 .

[0099] In a preferred embodiment, after closing the drain valve 9 and the rehydration pump 11, the method further includes:

[0100] S600, adjusting the water inlet pressure value of the circulation pump group 5 to a preset pressure value.

[0101] The preset pressure value can be selected as 1±0.2bar. After closing the drain valve 9 and the replenishing pump 11, the water inlet pressure value of the circulating pump group 5 needs to be adjusted to 1±0.2bar. Such a design can stabilize the system inlet pressure within the normal liquid cooling system operating pressure range (1±0.2bar). Because after online liquid replacement, the circulating water pump inlet pressure will operate outside the recommended inlet pressure operating range. If the water pump inlet pressure is lower than 0.8bar, in extreme cases, when the water pump inlet pressure is lower than 0.1bar, the system "lack of liquid alarm" is triggered, causing the circulating water pump to shut down due to lack of liquid protection. If the system pressure is higher than 1.2bar, in extreme cases, the excessive water pump inlet pressure will cause the system liquid supply pressure to be too high, causing the user-side cold plate to run in a high-pressure state for a long time, reducing the service life of the cold plate.

[0102] Method for regulating the circulating water pump inlet pressure: When the circulating water pump inlet pressure is higher than 1.2 bar (collected by the corresponding pressure sensor), the valve of the system drain valve 9 (both manual and automatic can be used as drain valve discharge types) can be opened for drainage. During the drainage process, when the circulating water pump inlet pressure drops to 1±0.2 bar, the valve of the drain valve 9 is closed, and the pressure regulation of the system after online fluid exchange is terminated. When the circulating water pump inlet pressure is lower than 0.8 bar, the liquid cooling system can be replenished. During the replenishment process, when the circulating water pump inlet pressure increases to 1±0.2 bar, the replenishment is stopped, and the pressure regulation of the system after online fluid exchange is terminated.

[0103] In a preferred embodiment, after adjusting the water inlet pressure value of the circulation pump group 5 to a preset pressure value, the method further includes:

[0104] S700, after the liquid cooling system has been running for a preset time, liquid is collected at a liquid discharge port of the liquid cooling system, and the extracted liquid to be tested is tested;

[0105] The preset time length can be selected as 5 minutes, and there is no special limitation on the specific time length. The setting of the preset time length can make the liquid cooling system run for a period of time after the liquid is replaced to ensure the stability of the medium in the system.

[0106] S800, judging whether the liquid to be tested is qualified, if not qualified, executing step S900;

[0107] S900, repeating steps S200 to S800 until the re-extracted liquid to be tested is qualified.

[0108] The detection of the liquid to be tested may include turbidity, conductivity and pH. Any abnormal value is considered unqualified, which proves that the medium in the secondary cooling system still needs to be replaced. Therefore, it is necessary to execute the aforementioned steps S200 to S800 and continue the liquid replacement operation until the re-extracted liquid test result is qualified.

[0109] For example, if the initial water quality has a conductivity of 350-370, a turbidity of 3.0-4.0, and a pH of 7.38, then if pure water is used for liquid replacement, the conductivity of the liquid to be tested obtained after the liquid replacement is 199.3, the turbidity is less than 1, and the pH is about 7.2, then the liquid to be tested is considered qualified.

[0110] In a preferred embodiment, after the online liquid replacement is completed, the liquid injection port 18 and the liquid discharge valve 9 are closed, and then the liquid discharge pipe and the liquid injection pipe are removed, and the inlet pipe of the unit liquid replenishment pump is reconnected to the liquid injection port 18 and fixed.

[0111] This is a corresponding step for the aforementioned step S200. After the liquid replacement of the secondary cooling system is completed, the settings of the online liquid replacement circuit and the drain valve 9 can be restored.

[0112] In summary, this embodiment proposes an online liquid replacement method for a liquid cooling system, which first sends a first control instruction to the first ball valve 12, and then after the online liquid replacement circuit and the drain valve are set according to preset requirements, the drain valve 9 is controlled to open to a preset opening to discharge liquid, and then the fluid replenishment pump is controlled to operate to inject liquid into the first main pipeline 2 through the first pipeline 10. At this time, the secondary cooling system is in a state of replenishing liquid and draining liquid at the same time. During the whole process, it is necessary to monitor the water inlet pressure value of the circulation pump group 5 in real time, and adjust the real-time opening of the drain valve 9 according to the water inlet pressure value; finally, the injection amount of the secondary cooling system is obtained. When the preset liquid replacement amount is reached, the drain valve 9 and the fluid replenishment pump are closed to complete an online liquid replacement.

[0113] Based on the above description, it can be seen that this method controls the balance of the replenishment and discharge rates of the circulating pump group 5 itself, maintains the pressure stability of the water inlet and outlet of the circulating pump group 5 and the entire system, effectively ensures that the liquid cooling system does not trigger a low-pressure alarm to cause the water pump to shut down, and realizes the entire liquid cooling system to change liquid without stopping, avoiding the situation where the host is shut down and cannot be used normally due to shutdown for liquid change, and ensures the host's continued efficient, reliable and stable operation.

[0114] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A liquid cooling system, characterized in that: include: A primary cooling system and a secondary cooling system, wherein heat exchange is performed between the primary cooling system and the secondary cooling system via a heat exchanger (1); The secondary cooling system comprises: a heat dissipation circulation loop formed with the hot side of the heat exchanger, and an online liquid replacement loop is arranged on the pipeline forming the heat dissipation circulation loop; the online liquid replacement loop is used to replace the medium in the secondary cooling system; The heat dissipation circulation loop at least includes: A first main pipe (2) connected to a first end of the hot side of the heat exchanger (1), the first main pipe (2) being connected in sequence to a first non-return valve (3), a first regulating valve (4), a circulating pump group (5) and a second regulating valve (6); a second main pipe (7) connected to the second end of the hot side of the heat exchanger (1), the second main pipe (7) being connected in sequence to a third regulating valve (8) and a drain valve (9); The online liquid replacement circuit comprises: a liquid replenishing tank (17), the liquid replenishing tank (17) being in communication with the first main pipeline (2) via a first pipeline (10); one end of the first pipeline (10) being connected to the liquid replenishing tank (17), and the connection point between the other end of the first pipeline and the first main pipeline (2) being located between the circulation pump group (5) and the second regulating valve (6), for replenishing liquid to the heat dissipation circulation circuit; the liquid replenishing tank (17) contains a medium for replacing liquid in the secondary cooling system; The first pipeline (10) is also provided with a liquid replenishing pump (11) and a first ball valve (12), and a one-way valve is also provided between the first ball valve (12) and the liquid replenishing pump (11); The first main pipeline (2) and the second main pipeline (7) also include a plurality of temperature sensors and pressure sensors, wherein the temperature sensors and the pressure sensors are used to collect pressure values ​​and temperature values ​​at various locations of the liquid cooling system, respectively; The temperature sensor and pressure sensor on the first main pipe (2) are used to monitor the return liquid pressure and return liquid temperature; while the temperature sensor and pressure sensor on the second main pipe (7) are used to monitor the supply liquid pressure and supply liquid temperature; wherein a pressure sensor is respectively provided at the front and rear ends of the circulation pump group (5), and the collected data are respectively the outlet pressure values.

2. A liquid cooling system according to claim 1, characterized in that: The top of the liquid replenishing tank (17) is provided with a liquid injection port (18), and the liquid injection port (18) is used to inject liquid into the interior of the liquid replenishing tank (17); The side wall of the liquid replenishing tank (17) is also provided with a sight glass (19) and a liquid level sensor (20) is arranged inside the sight glass (19), the sight glass (19) is used to observe the change of the liquid level in the liquid replenishing tank (17); the liquid level sensor (20) is used to monitor the liquid level in the liquid replenishing tank (17) and generate a liquid level signal.

3. The online liquid replacement system for a liquid cooling system according to claim 1, characterized in that: A filter (13) is also provided on the second main pipe (7); one end of the filter (13) is connected to the third regulating valve (8), and the other end of the filter (13) is connected to the drain valve (9).

4. A liquid cooling system according to claim 3, characterized in that: The heat dissipation circulation loop comprises a branch pipeline (15), one end of the branch pipeline (15) is connected to the first main pipeline (2), and the connection port enables the branch pipeline (15) to communicate with the second regulating valve (6); The other end of the branch pipeline (15) is connected to the second main pipeline (7), and the connection port enables the branch pipeline (15) to communicate with the third regulating valve (8); The branch pipeline (15) is provided with a first electric two-way valve (16).

5. An online liquid replacement method, characterized in that: Applied to a liquid cooling system according to any one of claims 1 to 4 above, the online liquid replacement method comprises: S100, sending a first control instruction to the first ball valve (12), wherein the first control instruction is used to close the first ball valve (12); S200, after the online liquid exchange circuit and the liquid drain valve (9) are set according to preset requirements, the liquid drain valve (9) is controlled to open to a preset opening to drain liquid; S300, controlling the liquid infusion pump (11) to operate and opening the first ball valve (12), and injecting liquid into the first main pipeline (2) through the first pipeline (10); S400, monitoring the water inlet pressure value of the circulation pump group (5) in real time, and adjusting the real-time opening of the drain valve (9) according to the water inlet pressure value; S500, obtaining the liquid injection volume of the secondary cooling system, and when the preset liquid replacement volume is reached, closing the drain valve (9) and the liquid replenishing pump (11); S600, adjusting the water inlet pressure value of the circulation pump group (5) to a preset pressure value; When the inlet pressure of the circulating water pump in the circulating pump group (5) is higher than the maximum value of the preset pressure value, the liquid can be discharged again by starting the valve of the drain valve (9); when the inlet pressure of the circulating water pump is lower than the minimum value of the preset pressure value, the liquid cooling system can be replenished with liquid again.

6. An online liquid replacement method according to claim 5, characterized in that: After the water inlet pressure value of the circulation pump group (5) is adjusted to a preset pressure value, the method further comprises: S700, after the liquid cooling system has been running for a preset time, liquid is collected at a liquid discharge port of the liquid cooling system, and the extracted liquid to be tested is tested; S800, judging whether the liquid to be tested is qualified, if not qualified, executing step S900; S900, repeating steps S200 to S800 until the re-extracted liquid to be tested is qualified.

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