Liquid cooling equipment and cooling medium purification system and method

Abstract

The present application discloses a liquid cooling device and a cooling medium purification system and method, which relate to the field of liquid cooling medium processing technology. The purification system includes a main line, a shunt line, a proportional valve, a filter unit and a reflux line. In the present application, there is no need to interrupt the liquid cooling device. The cooling medium in the liquid cooling device is input into the first branch and the second branch in the shunt line through the main line. The cooling medium entering the first branch is filtered and purified by the filter unit, and the cooling medium entering the second branch is not filtered and purified. The filtered and purified cooling medium and the unfiltered and purified cooling medium are combined into the reflux line, and finally circulate back to the liquid cooling device through the reflux line. Through the continuous reflux of the first branch and the second branch, the pollutants in the cooling medium can be dynamically removed during the operation of the liquid cooling device, thereby realizing online continuous purification of the cooling medium and avoiding efficiency loss caused by shutdown of the liquid cooling device.

Description

Technical Field

[0001] The present application relates to the technical field of liquid cooling medium processing, and in particular to a liquid cooling device and a cooling medium purification system and method. Background Art

[0002] In liquid-cooled equipment, the coolant (such as electronic fluorinated liquid) is crucial for effective heat dissipation. However, during its circulation, contaminants such as particulate matter, moisture, and ionic impurities can accumulate in the coolant, compromising its heat dissipation efficiency and the safe operation of the equipment. Therefore, the coolant needs to be purified to remove these contaminants.

[0003] Currently, the most common method for purifying cooling fluids is to use offline distillation regeneration. This method purifies the cooling fluid through heating evaporation and condensation recovery. Although it can remove various types of pollutants to a certain extent, it has the following shortcomings: this method is an offline operation and requires interrupting the operation of the liquid cooling system to purify or replace the filter material, which affects the continuous operation of the equipment to be cooled and causes idle resources. Summary of the Invention

[0004] The present application provides a liquid cooling device and a cooling medium purification system and method, which inputs the cooling medium in the liquid cooling device into the first branch and the second branch in the branch pipeline by setting a main pipeline, the cooling medium entering the first branch is filtered and purified by the filter unit, and the cooling medium entering the second branch is not filtered and purified; the filtered and purified cooling medium and the cooling medium that has not been filtered and purified are merged into the reflux pipeline together, and finally circulate back to the liquid cooling device through the reflux pipeline, and the contaminants in the cooling medium can be dynamically removed during the operation of the liquid cooling device through the continuous reflux of the first branch and the second branch, thereby realizing online continuous purification of the cooling medium, so as to at least solve the problem that the offline distillation regeneration method in the prior art can only be operated offline, and the operation of the liquid cooling system needs to be interrupted for purification or replacement of the filter material, which affects the continuous operation of the equipment to be cooled and causes idle resources.

[0005] The present application provides a cooling medium purification system for liquid cooling equipment, the purification system comprising:

[0006] a main line, the input end of which is connected to the liquid cooling device, and the main line is used to output the cooling medium in the liquid cooling device;

[0007] A shunt pipeline, wherein the input end of the shunt pipeline is connected to the output end of the main pipeline, and the shunt pipeline includes a first branch and a second branch connected in parallel;

[0008] a proportional valve, provided on the first branch and / or the second branch; the proportional valve is used to adjust the flow of the cooling medium in the first branch and the second branch;

[0009] A filter unit is provided on the first branch; the filter unit is used to filter the cooling medium in the first branch;

[0010] A reflux pipeline, the input end of which is connected to the output end of the branch pipeline, the output end of which is connected to the liquid cooling device, and the reflux pipeline is used to return the filtered cooling medium in the first branch and the unfiltered cooling medium in the second branch to the liquid cooling device.

[0011] In a further embodiment, the filtration unit comprises: a physical filtration module, a purification tower, a membrane separation module, and an electrostatic purification module, which are sequentially arranged in series along the flow direction of the cooling medium in the first branch;

[0012] The physical filtration module includes a first filter box, a second filter box, and a third filter box with successively smaller filtration apertures;

[0013] The purification tower is configured to at least adsorb moisture, organic matter and metal ions in the cooling medium;

[0014] The membrane separation module is configured to separate at least water, organic matter and metal ions in the cooling medium;

[0015] The electrostatic purification module is configured to sterilize microorganisms in the cooling medium.

[0016] In a further embodiment, the filtration unit further comprises:

[0017] A pure water flushing module, used for flushing the physical filtration module;

[0018] The pure water flushing module includes: a box containing pure water and a first pump; the input end of the first pump is connected to the box, and the output end of the first pump is connected to the physical filtration module; during flushing, the flow direction of the pure water is set to be opposite to the flow direction of the cooling medium in the physical filtration module;

[0019] The physical filtration module is provided with a drainage pipeline, the input end of the drainage pipeline is connected to the physical filtration module, and the output end of the drainage pipeline is connected to the box. The drainage pipeline is used to allow pure water to flow to the box after flushing is completed.

[0020] In a further embodiment, the purification system further comprises:

[0021] A pressure differential detection module is provided on the physical filtration module, the purification tower, the membrane separation module, and the electrostatic purification module; the pressure differential detection module is used to obtain and output pressure differential data on the physical filtration module, the purification tower, the membrane separation module, and the electrostatic purification module;

[0022] A leakage current detection module is provided on the electrostatic purification module; the leakage current detection module is used to obtain and output current data on the electrostatic purification module.

[0023] In a further embodiment, the purification system further comprises:

[0024] A contamination detection module is provided on the liquid cooling device; the contamination detection module is used to obtain and output contaminant data of the cooling medium, the contaminant data including at least pH, turbidity, conductivity and water concentration;

[0025] A control module is connected to the pollution detection module, the pressure difference detection module, and the leakage current detection module; the control module is used to receive the pollutant data, the pressure difference data, and the current data and make judgments.

[0026] In a further embodiment, a second pump body is provided on the main line, the input end of the second pump body is connected to the output end of the main line, and the output end of the second pump body is simultaneously connected to the input end of the first branch line and the input end of the second branch line.

[0027] In a further embodiment, the proportional valve is arranged on the first branch and is located on the side of the filter unit close to the second pump body, the input end of the proportional valve is connected to the output end of the second pump body, and the output end of the proportional valve is connected to the input end of the filter unit.

[0028] In a further embodiment, a switch valve is provided on the second branch, the input end of the switch valve is connected to the output end of the second pump body, and the output end of the switch valve is connected to the input end of the reflux pipeline.

[0029] The present application also provides a cooling medium purification method, based on the cooling medium purification system as described above, the purification method comprises the following steps:

[0030] Acquiring current contaminant data of the cooling medium to be purified, calculating a current opening of the proportional valve based on the current contaminant data, and adjusting the flow of the cooling medium in the first branch and the second branch based on the current opening;

[0031] The cooling medium in the first branch is filtered by the filter unit, and the filtered cooling medium in the first branch and the unfiltered cooling medium in the second branch flow through the return line to the liquid cooling device.

[0032] In a further embodiment, the calculating the current opening of the proportional valve based on the current pollutant data comprises the following steps:

[0033] Determining whether the current pollutant data satisfies a first condition, and if so, calculating the current opening of the proportional valve based on the current pollutant data and using a preset model;

[0034] Otherwise, the current pollutant data is determined to be abnormal data, and new pollutant data is acquired again after a predetermined period;

[0035] The current pollutant data includes a current moisture concentration, and the first condition is that the current moisture concentration is greater than 0.

[0036] In a further embodiment, the preset model is as follows:

[0037] ;

[0038] Where, K is the current opening, K base is the basic opening, α is the gain coefficient, C w is the current moisture concentration, C target is the target moisture concentration, ( y 1 ,y 2 ) is the opening control range.

[0039] In a further embodiment, the purification method further comprises the following steps:

[0040] Obtain real-time pressure differential data and calculate the current pressure differential rising rate based on the pressure differential data ,in, is the pressure difference, t is the time, and d represents the differential;

[0041] The current pressure difference rising rate and the critical value of the pressure difference rising rate M 0 Compare and get the comparison results:

[0042] like , a reminder instruction is generated; wherein, the reminder instruction includes a reminder to replace the filter unit and / or flush the filter unit;

[0043] like , a maintain status quo instruction is generated.

[0044] In a further embodiment, the purification method further comprises the following steps:

[0045] Presetting flushing conditions and flushing the filter unit according to the flushing conditions; wherein the flushing conditions include a standard flushing cycle and a standard flushing pressure;

[0046] Get the current pressure difference rising rate and the current pressure difference rising rate The first pressure difference rising rate threshold M 1 , the second pressure difference rising rate threshold M 2 , critical value of pressure difference rising rate M 0 Compare and get the comparison results:

[0047] exist When the standard flushing cycle is maintained and the standard flushing pressure is increased;

[0048] exist When the standard flushing cycle is shortened and the standard flushing pressure is increased;

[0049] exist When , the standard flushing cycle is extended and the standard flushing pressure is maintained;

[0050] in, M 0 > M 1 > M 2 .

[0051] In a further embodiment, the purification method further comprises the following steps:

[0052] Get real-time current data I w , the current data I w With current threshold I 0 Compare and get the comparison results:

[0053] like I w > I 0 , then generate an alarm instruction;

[0054] like I w ≤ I 0 , a maintain status quo instruction is generated.

[0055] The present application also provides a liquid cooling device, comprising a cooling medium purification system and an immersion tank as described above;

[0056] The input end of the main line is connected to the immersion tank, and the output end of the return line is connected to the immersion tank. The return line is used to return the filtered cooling medium in the first branch and the unfiltered cooling medium in the second branch to the immersion tank.

[0057] Through the present application, there is no need to interrupt the liquid cooling equipment. The cooling medium in the liquid cooling equipment is input into the first branch and the second branch in the branch line through the main line. The cooling medium entering the first branch is filtered and purified by the filter unit, and the cooling medium entering the second branch is not filtered and purified; the filtered and purified cooling medium and the unfiltered and purified cooling medium are merged into the return line together, and finally circulate back to the liquid cooling equipment through the return line. Through the continuous reflux of the first branch and the second branch, the pollutants in the cooling medium can be dynamically removed during the operation of the liquid cooling equipment, thereby realizing online continuous purification of the cooling medium and avoiding efficiency loss caused by shutdown of the liquid cooling equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0059] Figure 1 A schematic structural diagram of a cooling medium purification system provided in an embodiment of the present application;

[0060] Figure 2 A schematic diagram of the principle of a cooling medium purification system provided in an embodiment of the present application;

[0061] Figure 3 A module topology diagram of a cooling medium purification system provided in an embodiment of the present application;

[0062] Figure 4 This is a flow chart of a cooling fluid purification method provided in an embodiment of the present application.

[0063] Among them, the above-mentioned drawings include the following figure marks: 1. liquid cooling equipment; 2. main line; 3. first branch; 4. second branch; 5. proportional valve; 6. physical filtration module; 61. first filter box; 62. second filter box; 63. third filter box; 7. purification tower; 8. membrane separation module; 9. electrostatic purification module; 10. return line; 11. pure water flushing module; 111. box body; 112. first pump body; 12. drainage line; 13. pressure difference detection module; 14. pollution detection module; 141. pH sensor; 142. turbidity sensor; 143. conductivity sensor; 144. moisture sensor; 15. second pump body; 16. switch valve. DETAILED DESCRIPTION

[0064] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0065] It should be noted that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like, indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely for ease of description and simplification of the present application. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present application. The terms "mounted," "connected," and "connected" should be interpreted broadly, and may include, for example, fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. The terms "parallel," "perpendicular," and "equal" encompass the described conditions and conditions similar to the described conditions, provided that the range of the similar conditions is within an acceptable range of deviation, as determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes both absolute parallelism and approximate parallelism, where the acceptable deviation range for approximate parallelism may be, for example, within 5°; "perpendicular" includes both absolute perpendicularity and approximate perpendicularity, where the acceptable deviation range for approximate perpendicularity may also be, for example, within 5°. "Equal" includes both absolute equality and approximate equality, where the acceptable deviation range for approximate equality may be, for example, that the difference between the two is less than or equal to 5% of either. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0066] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0067] Currently, common purification methods include offline distillation and regeneration, and adsorption purification using static adsorbents. While offline distillation and regeneration can effectively separate impurities, it suffers from the following drawbacks: (1) it can only be performed periodically and cannot address real-time contamination of the coolant during operation; (2) it requires downtime for maintenance, which can disrupt the operation of, for example, servers waiting for cooling equipment, impacting the operation of the equipment being cooled; (3) purification efficiency is limited, particularly for submicron particles or dissolved ionic impurities; and (4) distillation involves high-temperature operation, resulting in high energy consumption.

[0068] Adsorption purification using static adsorbents, although simple in structure, has the following disadvantages: (1) limited adsorption capacity and the need for frequent replacement, which increases operation and maintenance costs and labor dependence; (2) it is designed only for a single type of pollutant and lacks the ability to comprehensively treat multiple impurities; (3) it lacks a real-time monitoring and feedback mechanism, making it difficult to dynamically adjust the purification strategy according to the degree of contamination and difficult to integrate into a compact liquid cooling system, limiting its application in high-density computing environments.

[0069] In order to solve the above problems, this application is proposed, and the application is explained below with reference to specific embodiments.

[0070] An embodiment of the present application provides a cooling medium purification system (hereinafter referred to as a purification system), which is applied to a liquid cooling device 1 . The purification system includes: a main line 2 , a branch line, a proportional valve 5 , a filter unit, and a return line 10 .

[0071] like Figure 1 and Figure 2 As shown, the input end of the main line 2 is connected to the liquid cooling device 1, and the main line 2 is used to output the cooling medium in the liquid cooling device 1. The input end of the branch line is connected to the output end of the main line 2, and the branch line includes a first branch 3 and a second branch 4 connected in parallel. The proportional valve 5 is installed on the first branch 3 and / or the second branch 4, and the proportional valve 5 is used to adjust the flow of the cooling medium in the first branch 3 and the second branch 4. For example, if the first branch 3 is equipped with a proportional valve 5, the second branch 4 is equipped with a valve for controlling the switch; for example, if the second branch 4 is equipped with a proportional valve 5, the first branch 3 is equipped with a valve for controlling the switch; for example, if both the first branch 3 and the second branch 4 are equipped with proportional valves 5 to control the flow of the cooling medium. A filter unit is provided on the first branch 3, and the filter unit is used to filter the cooling medium in the first branch 3.

[0072] The input end of the return line 10 is connected to the output end of the branch line, and the output end of the return line 10 is connected to the liquid cooling device 1. The return line 10 is used to return the filtered cooling medium in the first branch 3 and the unfiltered cooling medium in the second branch 4 to the liquid cooling device 1.

[0073] In the above technical solution, there is no need to interrupt the liquid cooling equipment 1. The main line 2 inputs the cooling medium in the liquid cooling equipment 1 into the first branch 3 and the second branch 4 in the branch line. The cooling medium entering the first branch 3 is filtered and purified by the filter unit, and the cooling medium entering the second branch 4 is not filtered and purified; the filtered and purified cooling medium and the unfiltered and purified cooling medium are merged into the return line 10 together, and finally circulate back to the liquid cooling equipment 1 through the return line 10, thereby realizing online continuous purification of the cooling medium and avoiding efficiency loss caused by shutdown of the liquid cooling equipment 1.

[0074] It should be noted that the proportional valve 5 is used to adjust the flow rate of the cooling medium in the first branch 3 and the second branch 4, and the flow rate of the cooling medium in the second branch 4 is greater than the flow rate of the cooling medium in the first branch 3. For example, if the proportional valve 5 is used to adjust the flow rate of the cooling medium in the first branch 3 to account for 5% of the flow rate of the cooling medium in the main line 2, the flow rate of the cooling medium in the second branch 4 will account for 95% of the flow rate of the cooling medium in the main line 2. For another example, if the proportional valve 5 is used to adjust the flow rate of the cooling medium in the first branch 3 to account for 20% of the flow rate of the cooling medium in the main line 2, the flow rate of the cooling medium in the second branch 4 will account for 80% of the flow rate of the cooling medium in the main line 2.

[0075] By providing a first branch 3 and a second branch 4, the cooling medium in the main line 2 is diverted and the flow of the cooling medium in the first branch 3 and the second branch 4 is regulated. Consequently, during purification of the cooling medium, only a small amount of the cooling medium passes through the filter unit in the first branch 3. This allows the filter unit to process only a portion of the cooling medium, reducing clogging of the filter unit, extending the filter unit replacement cycle, and reducing the frequency of filter unit maintenance. Furthermore, since only a small amount of cooling medium passes through the filter unit, the flow resistance of the entire purification system is reduced, thereby lowering the load and energy consumption of the pump in the purification system. Since the majority of the cooling medium flows directly to the return line 10 without being processed by the filter unit, the effects of the filtration operation on the majority of the cooling medium, such as increasing the cooling medium temperature, are avoided, thereby ensuring the cooling effect of the liquid cooling device. The long-term circulation of the cooling medium in the first branch 3 and the second branch 4 gradually reduces the concentration of contaminants in the cooling medium, and the clean state of the cooling medium is continuously maintained during long-term operation. Without interrupting the operation of the liquid cooling equipment and the equipment to be cooled, the purification system must remove moisture, particulate matter, ionic impurities, and organic decomposition products from the coolant in real time, maintaining the coolant's (e.g., fluorinated liquid) dielectric strength ≥40 kV (ASTM D877), water content ≤50 ppm (ISO 760), and particulate matter concentration ≤NAS 1638 Class 6. The contaminant removal rate for a single-cycle coolant in the first branch 3 must be ≥90% (for moisture and particulate matter), the total pressure drop across the filter units in the first branch 3 must be ≤0.2 MPa (the redundant capacity of the second pump 15 must cover this pressure drop), and the purification system power consumption must be ≤5% of the total power of the second pump 15.

[0076] It is worth mentioning that when the filter unit is replaced or maintained, it is only necessary to interrupt the flow of the cooling medium in the first branch 3. In other words, the filter unit can be replaced or maintained without interrupting the flow of the coolant in the second branch 4, thereby achieving online operation.

[0077] In a further embodiment, the filtration unit includes: a physical filtration module 6, a purification tower 7, a membrane separation module 8, and an electrostatic purification module 9, which are sequentially connected in series along the flow direction of the cooling medium in the first branch 3.

[0078] The physical filtration module 6 includes a first filter box 61, a second filter box 62, and a third filter box 63, each with successively smaller pore sizes. The first filter box 61 utilizes a stainless steel sintered filter element with a pore size of 10 μm and a compressive strength of ≥1.5 MPa. The second filter box 62 utilizes a ceramic fiber filter element with a pore size of 1 μm and a temperature resistance of 200°C. The third filter box 63 utilizes a PTFE membrane filter element with a pore size of 0.1 μm, which is used for hydrophobicity and anti-clogging.

[0079] Purification tower 7 is used to absorb at least moisture, organic matter, and metal ions from the coolant. In this embodiment, the tower body of purification tower 7 is made of 316L stainless steel (lined with PTFE for corrosion protection). Three different adsorbent layers are installed within purification tower 7: 3A molecular sieve adsorbent, coconut shell activated carbon adsorbent, and strongly acidic cation adsorbent. The 3A molecular sieve adsorbent adsorbs moisture and has a capacity of 200 g / L; the coconut shell activated carbon adsorbent adsorbs organic pollutants (VOCs) and has a capacity of 150 g / L; and the strongly acidic cation adsorbent adsorbs metal ions (such as Fe³ and Cu²) and has a capacity of 100 g / L.

[0080] Membrane separation module 8 is used to separate at least water, organic matter, and metal ions from the cooling medium. The membrane material in membrane separation module 8 is a hydrophobic PTFE hollow fiber membrane with a pore size of 0.02 μm and a porosity of ≥80%. Furthermore, the membrane surface is coated with perfluoroalkylsilane to reduce the adhesion of organic matter.

[0081] Electrostatic purification module 9 is used to sterilize microorganisms in the cooling fluid. It utilizes titanium-plated ruthenium plates, which offer excellent resistance to corrosion from fluorinated fluids. A voltage gradient of 5 kV / cm effectively captures charged particles sized 0.5-1 μm, improving purification efficiency. To prevent electrolysis of fluorinated fluids, electrostatic purification module 9 incorporates a current limiting function, with an operating current of ≤15 μA, ensuring safe and stable operation. A perfluoroether rubber seal is used between the plates and the housing for insulation protection, ensuring long-term, reliable operation of the module.

[0082] like Figure 1 As shown, the input end of the first filter box 61 is connected to the output end of the proportional valve 5, the output end of the first filter box 61 is connected to the input end of the second filter box 62, the output end of the second filter box 62 is connected to the input end of the third filter box 63, the output end of the third filter box 63 is connected to the input end of the purification tower 7, the output end of the purification tower 7 is connected to the input end of the membrane separation module 8, the output end of the membrane separation module 8 is connected to the input end of the electrostatic purification module 9, and the output end of the electrostatic purification module 9 is connected to the input end of the reflux pipeline 10.

[0083] In the above technical solution, a multi-stage physical filtration module 6 (comprising a first filter box 61, a second filter box 62, and a third filter box 63, each with successively decreasing pore sizes) efficiently removes particulate impurities of varying sizes, particularly improving the capture efficiency of submicron particles. Simultaneously, a purification tower 7 adsorbs and removes moisture, organic matter, and metal ions from the coolant. A membrane separation module 8 further selectively separates moisture, organic matter, and metal ions, enhancing the removal capacity of soluble ionic impurities. The electrostatic purification module 9 effectively sterilizes microorganisms in the coolant, comprehensively addressing the problem of biological contamination. The filtration unit achieves comprehensive treatment of multiple types of contaminants (particles, ions, organic matter, and microorganisms), significantly improving purification efficiency and applicability, and effectively addressing the low efficiency and limited specificity of traditional purification methods.

[0084] In a further embodiment, the filtration unit further includes: a pure water flushing module 11 for flushing the physical filtration module 6 .

[0085] The pure water flushing module 11 comprises a tank 111 for holding pure water and a first pump 112. The input of the first pump 112 is connected to the tank 111, and the output of the first pump 112 is connected to the physical filtration module 6. During flushing, the pure water flows in the opposite direction of the coolant in the physical filtration module 6. The first pump 112 is a booster water pump.

[0086] The physical filter module 6 is provided with a drainage pipe 12 , the input end of the drainage pipe 12 is connected to the physical filter module 6 , and the output end of the drainage pipe 12 is connected to the box 111 . The drainage pipe 12 is used to allow pure water to flow to the box 111 after flushing is completed.

[0087] In the above technical solution, starting the first pump 112 causes the pure water in the box 111 to sequentially flush the third filter box 63, the second filter box 62, and the first filter box 61 in the filter module, removing impurities from the filter elements of the first filter box 61, the second filter box 62, and the third filter box 63, preventing filter element clogging and ensuring filtration effectiveness. The flushed pure water then flows back into the box 111 through the drainage pipe 12. After flushing, the filter module is purged with clean compressed air or heated and dried to minimize residual moisture, prevent microbial contamination, and affect the purity of the cooling medium.

[0088] It is worth mentioning that in this embodiment, during flushing, the flow direction of pure water is set to be opposite to the flow direction of the cooling medium in the physical filtration module 6. During the filtration process, particulate impurities in the cooling medium will gradually deposit on the surface of the filter element and in the internal pores. Larger particles are intercepted by the surface of the filter element, while smaller particles penetrate deep into the filter element. Backwashing can more effectively push out these deeply trapped pollutants, improve the cleaning effect, and backwashing can change the fluid path, improve the overall cleaning coverage, and reduce pollutant residues. In addition, for structures with a certain pore gradient such as stainless steel sintered filter elements, backwashing can avoid structural damage caused by excessive internal pressure of the filter material due to forward high-pressure flushing, and play a role in protecting the integrity of the filter element. It should be noted that it is prohibited to start the first pump body 112 before the proportional valve 5 is closed; after flushing is completed, delay for a period of time (such as 5s, 10s, 15s, etc.) before starting the proportional valve 5 to resume filtration.

[0089] In a further embodiment, the purification system further includes: a pressure difference detection module 13 and a leakage current detection module.

[0090] The pressure difference detection module 13 is set on the physical filtration module 6, purification tower 7, membrane separation module 8 and electrostatic purification module 9. The pressure difference detection module 13 is used to obtain and output the pressure difference data on the physical filtration module 6, purification tower 7, membrane separation module 8 and electrostatic purification module 9. The pressure difference detection module 13 uses a pressure difference sensor with a range of 0-0.1 MPa and an accuracy of ±1%. Figure 1 As shown, the pressure difference sensor detects the pressure difference between the input and output ends of the first filter box 61. The pressure difference detection of the second filter box 62, the third filter box 63, the purification tower 7, the membrane separation module 8 and the electrostatic purification module 9 is the same as that of the first filter box 61 and will not be repeated here.

[0091] The leakage current detection module is provided on the electrostatic purification module 9 and is used to obtain and output current data on the electrostatic purification module 9. The leakage current detection module uses a current sensor.

[0092] In the above technical solution, the pressure differential data of the input and output ends of the first filter box 61, the second filter box 62, the third filter box 63, the purification tower 7, the membrane separation module 8, and the electrostatic purification module 9 are monitored in real time using a pressure differential sensor. The pressure differential data is used to determine whether they are blocked. If the pressure differential rise rate is greater than 0.01 MPa / h, a replacement reminder is triggered to achieve timely replacement of blocked components to ensure the filtration effect. The current on the electrostatic purification module 9 is monitored in real time using a current sensor. When the monitored current is greater than 15μA, an alarm is triggered to effectively prevent safety hazards caused by overcurrent or leakage current.

[0093] In a further embodiment, the purification system further includes: a contamination detection module 14 and a control module.

[0094] The contamination detection module 14 is installed on the liquid cooling device 1. It is used to obtain and output contamination data of the cooling medium. The contamination data includes at least pH, turbidity, conductivity, and moisture concentration. The contamination detection module 14 includes at least a pH sensor 141, a turbidity sensor 142, a conductivity sensor 143, and a moisture sensor 144.

[0095] like Figure 3 As shown, the control module is in communication with the pollution detection module 14, the pressure difference detection module 13, and the leakage current detection module. The control module is configured to receive pollutant data, pressure difference data, and current data, and perform judgments based on the pollutant data, pressure difference data, and current data to obtain judgment results. The control module then generates corresponding instructions based on the judgment results. The control module includes, but is not limited to, a programmable logic controller and an industrial computer.

[0096] In the above-described technical solution, the control module receives pollutant data, pressure differential data, and current data obtained through real-time monitoring by the contamination detection module 14, the pressure differential detection module 13, and the leakage current detection module. The control module then makes corresponding judgments based on the pollutant data, pressure differential data, and current data, obtains judgment results, and generates corresponding instructions based on the judgment results. These instructions include, but are not limited to, adjusting the opening of the proportional valve 5, issuing an alarm, changing flushing conditions, maintaining the current status, etc. Based on the detection data, the control module promptly detects abnormal data that occurs during the operation of the purification system and automatically adjusts the purification strategy based on the abnormal data, achieving dynamic intelligent control and improving the reliability and stability of the purification system. It is worth mentioning that the purification system includes a human-computer interaction interface that can display key data such as pH, turbidity, conductivity, water concentration, and pressure differential in real time, allowing personnel to promptly understand the operating status of the purification system.

[0097] In a further embodiment, a second pump body 15 is provided on the main line 2. The input end of the second pump body 15 is connected to the output end of the main line 2, and the output end of the second pump body 15 is simultaneously connected to the input end of the first branch line 3 and the input end of the second branch line 4. The second pump body 15 is a booster water pump.

[0098] In the above technical solution, the second pump body 15 pressurizes the cooling medium, and the water pressurized by the second pump body 15 flows into the first branch 3 and the second branch 4 respectively.

[0099] In a further embodiment, the proportional valve 5 is arranged on the first branch 3 and is located on the side of the filter unit close to the second pump body 15, the input end of the proportional valve 5 is connected to the output end of the second pump body 15, and the output end of the proportional valve 5 is connected to the input end of the filter unit.

[0100] In the above technical solution, the proportional valve 5 uses PID control to control the opening degree to control the flow of the cooling medium entering the first branch 3, thereby controlling the purification amount of the cooling medium. In this embodiment, the opening degree range of the proportional valve 5 is 5% to 35%.

[0101] In a further embodiment, a switch valve 16 is provided on the second branch 4 , the input end of the switch valve 16 is connected to the output end of the second pump body 15 , and the output end of the switch valve 16 is connected to the input end of the reflux pipeline 10 .

[0102] In the above technical solution, the switch valve 16 is an electric ball valve. During the operation of the purification system, the electric ball valve is in an open state. The opening is adjusted by the proportional valve 5 to adjust the purification amount of the cooling medium in the first branch 3. The remaining cooling medium flows to the return line 10 through the second branch 4 and returns to the liquid cooling device 1.

[0103] It is worth noting that in this embodiment, the flow rate of the cooling medium in the first branch 3 is smaller than the flow rate of the cooling medium in the second branch 4. That is to say, most of the cooling medium flowing out of the main branch 2 is not filtered and quickly flows back to the liquid cooling device 1. In this embodiment, a multi-stage filtration module is set in the filter unit. Due to the resistance of the filter material, the flow rate of the cooling medium in the first branch 3 is reduced when it flows through the filter unit, which easily causes the cooling medium to accumulate or be retained in the filter unit, and the heat exchange efficiency in the liquid cooling device 1 is reduced. In order to solve this problem, a second branch is designed. Through the rapid reflux of a large amount of cooling medium in the second branch 4, it is ensured that there is still enough cooling medium in the liquid cooling device 1 to maintain the cooling effect of the liquid cooling device 1.

[0104] Another embodiment of the present application provides a cooling medium purification method (hereinafter referred to as the purification method), based on a cooling medium purification system as in the above embodiment, such as Figure 4 As shown, the purification method comprises the following steps:

[0105] Acquiring current contaminant data of the cooling medium to be purified, calculating a current opening of the proportional valve 5 based on the current contaminant data, and adjusting the flow of the cooling medium in the first branch and the second branch based on the current opening;

[0106] The cooling medium in the first branch is filtered by the filter unit, and the filtered cooling medium in the first branch and the unfiltered cooling medium in the second branch flow through the return line 10 into the liquid cooling device 1 .

[0107] In the above technical solution, the opening of the proportional valve 5 in this embodiment is dynamically adjusted based on the real-time update of the pollutant data of the cooling medium to be purified in the liquid cooling equipment 1. When the pollutant concentration in the pollutant data is high, the opening of the proportional valve 5 is increased to increase the purification amount of the cooling medium in the first branch and accelerate the purification. Conversely, the opening of the proportional valve 5 is reduced to avoid damage caused by excessive purification and reduce mechanical wear of structures such as the filter element.

[0108] In a further embodiment, the calculating the current opening of the proportional valve 5 based on the current pollutant data comprises the following steps:

[0109] Determine whether the current pollutant data satisfies a first condition, and if so, calculate the current opening of the proportional valve 5 based on the current pollutant data and using a preset model;

[0110] Otherwise, the current pollutant data is determined to be abnormal data, and new pollutant data is acquired again after a predetermined period;

[0111] The current pollutant data includes a current moisture concentration, and the first condition is that the current moisture concentration is greater than 0.

[0112] In the above technical solution, in this embodiment, the current opening of the proportional valve 5 is controlled by the current moisture concentration in the current pollutant data. When it is detected that the current moisture concentration is greater than 0, the current opening of the proportional valve 5 is calculated using a preset model, and the moisture fluctuation is responded to in real time to avoid excessive moisture causing the dielectric strength of the cooling medium to decrease. In addition, the purification is diverted on demand to reduce invalid circulation, suppress the loss caused by excessive purification, and reduce the mechanical wear of the filter element.

[0113] It should be noted that, when it is detected that the current moisture concentration is ≤0, the current moisture concentration is determined to be abnormal data, the abnormal data is discarded, and a new moisture concentration is obtained again in a predetermined period (such as 0.5s, 1s, 2s, or 3s, etc.) until the new moisture concentration is greater than 0, and then the opening of the proportional valve 5 is calculated based on the new moisture concentration.

[0114] In a further embodiment, the preset model is as follows:

[0115] ;

[0116] Where, K is the current opening, K base is the basic opening, α is the gain coefficient, C w is the current moisture concentration, C target is the target moisture concentration, ( y 1,y 2 ) is the opening control range, K base = y 1 .

[0117] In the above technical solution, the opening control range is set based on actual purification requirements such as the properties of the cooling medium, purification efficiency, etc. For example, in this embodiment, the opening control range ( y 1 ,y 2 ) is set to (5%, 35%). In other embodiments, it can be set to (10%, 30%), (6%, 32%), etc. The basic opening, gain factor, and target moisture concentration are also set based on actual purification requirements. For ease of understanding, the following description uses specific numerical values: In this embodiment, the basic opening is set to 5%, the gain factor is set to 12%, and the target moisture concentration is set to 50 ppm.

[0118] The current opening is calculated based on the current moisture concentration and the above formulas (1) and (2), and the current opening is controlled within ( y 1 ,y 2 ) within. C w =100 ppm, calculated using formula (1) K =13.32%, and then using formula (2) we can get K =13.32%, the final adjustment proportional valve 5 current opening is 13.32%. =25 ppm, calculated using formula (1) K =-3.32%, and then using formula (2) we can get K =5%, the final adjustment ratio valve 5 current opening is 5%. C w =650 ppm, calculated using formula (1) K =35.78%, and then using formula (2) we can get K =35%, and the current opening of the final adjustment proportional valve 5 is 35%.

[0119] It is worth mentioning that in this embodiment, the opening of the proportional valve 5 is limited to ( y 1 ,y 2 ) can ensure the balanced dynamic circulation of the entire purification system. If the opening of the proportional valve 5 is less than y 1, the purified flow of the cooling medium in the first branch 3 is too small, resulting in a low pollutant removal rate, the conductivity of the cooling medium in the liquid cooling equipment, the concentration of particulate matter, etc. are still not effectively reduced, and the filter unit does not fully participate in the reaction, resulting in a low utilization rate of the filter unit. If the opening of the proportional valve 5 is greater than y 2 , the purification flow of the cooling medium in the first branch 3 will be too much, and the excessive flow will accelerate the consumption rate of each module in the filter unit, requiring frequent replacement of each module of the filter unit; the excessive flow will bring about an excessively fast flow rate, resulting in incomplete purification of the cooling medium and reducing the purification efficiency.

[0120] In a further embodiment, the purification method further comprises the following steps:

[0121] Obtain real-time pressure differential data and calculate the current pressure differential rising rate based on the pressure differential data ,in, is the pressure difference, t is the time, and d represents the differential;

[0122] The current pressure difference rising rate and the critical value of the pressure difference rising rate M 0 Compare and get the comparison results:

[0123] like , a reminder instruction is generated; wherein, the reminder instruction includes a reminder to replace the filter unit and / or flush the filter unit;

[0124] like , a maintain status quo instruction is generated.

[0125] In the above technical solution, the real-time pressure difference data is obtained by the above-mentioned pressure difference detection module 13, and the control module calculates the current pressure difference rising rate based on the pressure difference data. and the current pressure differential rising rate and the critical value of the pressure difference rising rate M 0 Compare: If , indicating that the module in the filter unit (such as the first filter box 61, purification tower 7, etc.) is clogged, a reminder instruction is generated to remind the staff to replace the filter unit and / or flush the filter unit (such as replacing the purification tower 7, flushing the first filter box 61). , indicating that the module in the filter unit is not blocked and is in good working condition, a maintain status quo instruction is generated.

[0126] It is worth noting that the critical value of the pressure difference rising rate M 0 The specific value of is determined based on actual needs. For ease of understanding, the critical value of the pressure difference rising rate in this embodiment isM 0 Set to 0.01 MPa / h. By acquiring real-time differential pressure data, it is possible to determine whether the modules in the filtration unit are clogged, and to promptly respond to and address the clogged situation, thus ensuring the purification efficiency of the purification system.

[0127] In a further embodiment, the purification method further comprises the following steps:

[0128] Presetting flushing conditions and flushing the filter unit according to the flushing conditions; wherein the flushing conditions include a standard flushing cycle and a standard flushing pressure;

[0129] Get the current pressure difference rising rate and the current pressure difference rising rate The first pressure difference rising rate threshold M 1 , the second pressure difference rising rate threshold M 2 , critical value of pressure difference rising rate M 0 Compare and get the comparison results:

[0130] exist When the standard flushing cycle is maintained and the standard flushing pressure is increased;

[0131] exist When the standard flushing cycle is shortened and the standard flushing pressure is increased;

[0132] exist When , the standard flushing cycle is extended and the standard flushing pressure is maintained;

[0133] in, M 0 > M 1 > M 2 .

[0134] In the above technical solution, the flushing process is implemented by the above pure water flushing module 11. Standard flushing cycle, standard flushing pressure, first pressure difference rising rate threshold M 1 , the second pressure difference rising rate threshold M 2All settings are based on actual needs. For ease of understanding, the following is an example using specific numerical values: In this embodiment, the standard flushing cycle is set to 30 minutes, and the flushing pressure is set to 0.8 MPa. That is to say, in the initial state, the pure water flushing module 11 reversely flushes the physical filtration module 6, flushing once every 30 minutes, the flushing pressure is 0.8 MPa, and the flushing time is 3 minutes (or 5 minutes). In this embodiment, the first pressure difference rising rate threshold Set to 0.005 MPa / h, the second pressure difference rising rate threshold M 2 Set to 0.002 MPa / h.

[0135] exist When the pressure is greater than 0.005 MPa / h, the standard flushing cycle is maintained and the standard flushing pressure is increased, flushing is performed every 30 minutes, and the flushing pressure is 1.0 MPa.

[0136] exist When the pressure is >0.01MPa / h, the standard flushing cycle is shortened and the standard flushing pressure is increased, flushing once every 10 minutes, and the flushing pressure is 1.0 MPa (or higher).

[0137] exist <0.002MPa / h, extend the standard flushing cycle and maintain the standard flushing pressure, flushing once every 60 minutes, and the flushing pressure is 0.8 MPa.

[0138] The flushing cycle and flushing pressure are dynamically adjusted through pressure difference data, making back flushing more intelligent and automated, avoiding excessive cleaning caused by fixed-cycle flushing. In addition, dynamic control can prevent mechanical fatigue of the filter element caused by frequent flushing, and can remove pollutants in time to prevent long-term backlog from causing damage to the filter element structure or performance degradation.

[0139] In a further embodiment, the purification method further comprises the following steps:

[0140] Get real-time current data I w , the current data I w With current threshold I 0 Compare and get the comparison results:

[0141] like I w > I 0 , then generate an alarm instruction;

[0142] like I w ≤I 0 , a maintain status quo instruction is generated.

[0143] In the above technical solution, the current data I w The control module receives the current data obtained by the leakage current detection module. I w and compare it with the current threshold I 0 Compare. I w > I 0 , indicating that the current on the electrostatic purification module 9 exceeds the threshold, an alarm instruction is generated to remind the staff to take corresponding measures; if I w ≤ I 0 , indicating that the current on the electrostatic purification module 9 is within the safe range, then a maintenance instruction is generated. It should be noted that the current threshold I 0 Based on actual needs, for ease of understanding, the current threshold in this embodiment is I 0 Set to 15μA. By real-time monitoring of the current data on the electrostatic purification module 9 I w , timely respond to current current data In the event of excessively high pressure, ensure the safe operation of the purification system.

[0144] Another embodiment of the present application provides a liquid cooling device, including a cooling medium purification system and an immersion tank as described in the above embodiment;

[0145] The input end of the main line 2 is connected to the immersion tank, and the output end of the return line 10 is connected to the immersion tank. The return line 10 is used to return the filtered cooling medium in the first branch 3 and the unfiltered cooling medium in the second branch 4 to the immersion tank.

[0146] The cooling medium in the immersion tank is input into the first branch 3 and the second branch 4 through the main line 2. The cooling medium entering the first branch 3 is filtered and purified by the filter unit, and the cooling medium entering the second branch 4 is not filtered and purified. The filtered and purified cooling medium and the unfiltered and purified cooling medium are combined into the return line 10, and finally circulate back to the immersion tank through the return line 10. The above cycle realizes the online purification of the cooling medium.

[0147] Through online purification of the cooling fluid, the service life of the cooling fluid (such as fluorinated liquid) is effectively extended, and its replacement cycle is extended from the original 2-3 years to 5-8 years, significantly improving resource utilization efficiency. At the same time, the downtime required in the traditional offline purification process (usually 3-7 days) is avoided, ensuring the operation of the equipment to be cooled. This embodiment also reduces the reliance on manual inspection and frequent replacement of the cooling fluid, reduces maintenance intensity, and improves the stability and continuity of the system operation. Through the circulation purification method, not only is the consumption of water resources reduced, but the impact of cooling fluid emissions on the environment is also reduced.

[0148] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core ideas of this application. It should be noted that for those skilled in the art, without departing from the principles of this application, various improvements and modifications can be made to this application, and such improvements and modifications also fall within the scope of protection of this application.

Claims

1. A cooling medium purification system, applied to a liquid cooling device (1), characterized in that: The purification system comprises: A main line (2), the input end of the main line (2) being connected to the liquid cooling device (1), and the main line (2) being used to output the cooling medium in the liquid cooling device (1); A shunt pipeline, wherein the input end of the shunt pipeline is connected to the output end of the main pipeline (2), and the shunt pipeline comprises a first branch (3) and a second branch (4) connected in parallel; A proportional valve (5) is provided on the first branch (3) and / or the second branch (4); the proportional valve (5) is used to adjust the flow of the cooling medium in the first branch (3) and the second branch (4); A filter unit is provided on the first branch (3); the filter unit is used to filter the cooling medium in the first branch (3); A return line (10), wherein the input end of the return line (10) is connected to the output end of the branch line, and the output end of the return line (10) is connected to the liquid cooling device (1), and the return line (10) is used to return the filtered cooling medium in the first branch (3) and the unfiltered cooling medium in the second branch (4) to the liquid cooling device (1); The filtration unit comprises: a physical filtration module (6), a purification tower (7), a membrane separation module (8), and an electrostatic purification module (9), which are sequentially arranged in series along the flow direction of the cooling medium in the first branch (3); The physical filtration module (6) comprises a first filter box (61), a second filter box (62), and a third filter box (63) whose filter apertures decrease in sequence; The purification tower (7) is configured to adsorb at least moisture, organic matter and metal ions in the cooling medium; The membrane separation module (8) is configured to separate at least water, organic matter and metal ions in the cooling medium; The electrostatic purification module (9) is configured to sterilize microorganisms in the cooling medium.

2. A cooling medium purification system according to claim 1, characterized in that: The filtering unit further comprises: A pure water flushing module (11) is used to flush the physical filtration module (6); The pure water flushing module (11) comprises: a box (111) for accommodating pure water and a first pump body (112); an input end of the first pump body (112) is in communication with the box (111), and an output end of the first pump body (112) is in communication with the physical filter module (6); during flushing, the flow direction of the pure water is set to be opposite to the flow direction of the cooling medium in the physical filter module (6); The physical filter module (6) is provided with a drainage pipeline (12), the input end of the drainage pipeline (12) is connected to the physical filter module (6), and the output end of the drainage pipeline (12) is connected to the box (111). The drainage pipeline (12) is used to allow pure water to flow to the box (111) after flushing is completed.

3. A cooling medium purification system according to claim 1, characterized in that: The purification system also includes: A pressure difference detection module (13) is provided on the physical filtration module (6), the purification tower (7), the membrane separation module (8), and the electrostatic purification module (9); the pressure difference detection module (13) is used to obtain and output pressure difference data on the physical filtration module (6), the purification tower (7), the membrane separation module (8), and the electrostatic purification module (9); A leakage current detection module is provided on the electrostatic purification module (9); the leakage current detection module is used to obtain and output current data on the electrostatic purification module (9).

4. A cooling medium purification system according to claim 3, characterized in that: The purification system also includes: A contamination detection module (14) is provided on the liquid cooling device (1); the contamination detection module (14) is used to obtain and output contamination data of the cooling medium, the contamination data at least including pH, turbidity, conductivity, and water concentration; A control module is connected to the pollution detection module (14), the pressure difference detection module (13), and the leakage current detection module; the control module is used to receive the pollutant data, the pressure difference data, and the current data and make judgments.

5. A cooling medium purification system according to claim 1, characterized in that: A second pump body (15) is provided on the main line (2), the input end of the second pump body (15) is connected to the output end of the main line (2), and the output end of the second pump body (15) is simultaneously connected to the input end of the first branch line (3) and the input end of the second branch line (4).

6. A cooling medium purification system according to claim 5, characterized in that: The proportional valve (5) is provided on the first branch (3) and is located on a side of the filter unit close to the second pump body (15); the input end of the proportional valve (5) is connected to the output end of the second pump body (15), and the output end of the proportional valve (5) is connected to the input end of the filter unit.

7. A cooling medium purification system according to claim 6, characterized in that: The second branch (4) is provided with a switch valve (16), the input end of the switch valve (16) is connected to the output end of the second pump body (15), and the output end of the switch valve (16) is connected to the input end of the return line (10).

8. A cooling medium purification method, based on a cooling medium purification system according to any one of claims 1 to 7, characterized in that: The purification method comprises the following steps: obtaining current contaminant data of the cooling medium to be purified, calculating the current opening of the proportional valve (5) based on the current contaminant data, and adjusting the flow of the cooling medium in the first branch (3) and the second branch (4) based on the current opening; The cooling medium in the first branch (3) is filtered by a filter unit, and the filtered cooling medium in the first branch (3) and the unfiltered cooling medium in the second branch (4) flow through a return line (10) into the liquid cooling device (1).

9. A cooling medium purification method according to claim 8, characterized in that: The calculation of the current opening of the proportional valve (5) based on the current pollutant data comprises the following steps: Determining whether the current pollutant data satisfies a first condition, and if so, calculating the current opening of the proportional valve (5) based on the current pollutant data and using a preset model; Otherwise, the current pollutant data is determined to be abnormal data, and new pollutant data is acquired again after a predetermined period; The current pollutant data includes a current moisture concentration, and the first condition is that the current moisture concentration is greater than 0.

10. A cooling medium purification method according to claim 9, characterized in that: The preset model is as follows: Where, K is the current opening, K base is the basic opening, α is the gain coefficient, C w is the current moisture concentration, C target is the target moisture concentration, and (y1, y2) is the opening control range.

11. A cooling medium purification method according to claim 8, characterized in that: The purification method further comprises the following steps: Obtain real-time pressure differential data and calculate the current pressure differential rising rate based on the pressure differential data Where ΔP is the pressure difference, t is the time, and d represents the differential; The current pressure difference rising rate Comparing with the critical value M0 of the pressure difference rising rate, the comparison result is: like Then a reminder instruction is generated; wherein, the reminder instruction includes a reminder to replace the filter unit and / or flush the filter unit; like A maintain status quo instruction is generated.

12. A cooling medium purification method according to claim 11, characterized in that: The purification method further comprises the following steps: Presetting flushing conditions and flushing the filter unit according to the flushing conditions; wherein the flushing conditions include a standard flushing cycle and a standard flushing pressure; Get the current pressure difference rising rate The current pressure difference rising rate Compare with the first pressure difference rising rate threshold M1, the second pressure difference rising rate threshold M2, and the pressure difference rising rate critical value M0 respectively to obtain the comparison results: exist When the standard flushing cycle is maintained and the standard flushing pressure is increased; exist When the standard flushing cycle is shortened and the standard flushing pressure is increased; exist When , the standard flushing cycle is extended and the standard flushing pressure is maintained; wherein, M0>M1>M2.

13. A cooling medium purification method according to claim 8, characterized in that: The purification method further comprises the following steps: Get real-time current data I w , the current data I w Compare with the current threshold I0 and get the comparison result: If I w >I0, an alarm instruction is generated; If I w ≤I0, a maintain status quo instruction is generated.

14. A liquid cooling device, characterized in that: comprising a cooling medium purification system and an immersion tank as claimed in any one of claims 1 to 7; The input end of the main line (2) is connected to the immersion tank, and the output end of the return line (10) is connected to the immersion tank. The return line (10) is used to return the filtered cooling medium in the first branch (3) and the unfiltered cooling medium in the second branch (4) to the immersion tank.

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