Liquid cooling equipment and cooling working medium purification system and method

Abstract

The invention discloses liquid cooling equipment and a cooling working medium purification system and method, and relates to the technical field of liquid cooling working medium treatment, and the purification system comprises a main pipeline, a shunt pipeline, a proportional valve, a filter unit and a return pipeline. According to the application, the liquid cooling equipment does not need to be interrupted, the cooling working medium in the liquid cooling equipment is input into the first branch and the second branch in the shunting pipeline through the main pipeline, the cooling working medium entering the first branch is filtered and purified by the filtering unit, and the cooling working medium entering the second branch is not filtered and purified; the filtered and purified cooling working medium and the unfiltered and purified cooling working medium are converged into the backflow pipeline together and finally circularly flow back into the liquid cooling equipment through the backflow pipeline, and pollutants in the cooling working medium can be dynamically removed in the operation process of the liquid cooling equipment through continuous backflow of the first branch and the second branch. The online continuous purification of the cooling working medium is realized, and the efficiency loss caused by the shutdown of the liquid cooling equipment is avoided.

Description

Technical Field

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

[0002] In a liquid cooling device, a cooling working medium (such as electronic fluorinated liquid) is the key to effective heat dissipation. However, during the recycling process of the cooling working medium, there are some pollutants such as particulate matters, moisture, and ionic impurities in the cooling working medium, which affect its heat dissipation efficiency and the safe operation of the device. Therefore, the cooling working medium needs to be purified to remove the pollutants therein.

[0003] Currently, the common method for purifying the cooling working medium is the off-line distillation regeneration method. This method realizes the purification of the cooling working medium through the way of heating evaporation and condensation recovery. Although it can remove various types of pollutants to a certain extent, it has the following deficiencies: This method is an off-line operation, and it is necessary to interrupt the operation of the liquid cooling system to carry out purification or replace the filter material, which affects the continuous operation of the equipment to be cooled and causes resource idleness. Summary of the Invention

[0004] The present application provides a liquid cooling device, a cooling working medium purification system and a method. By setting a main pipeline to input the cooling working medium in the liquid cooling device into the first branch and the second branch of the shunt pipeline, the cooling working medium entering the first branch is filtered and purified by the filtering unit, and the cooling working medium entering the second branch is not filtered and purified; the filtered and purified cooling working medium and the unfiltered and purified cooling working medium are merged into the return pipeline together, and finally circulate back to the liquid cooling device through the return pipeline. Through the continuous return of the first branch and the second branch, it is possible to dynamically remove the pollutants in the cooling working medium during the operation of the liquid cooling device, realize the on-line continuous purification of the cooling working medium, so as to at least solve the problem that the off-line distillation regeneration method in the prior art can only be operated off-line, and it is necessary to interrupt the operation of the liquid cooling system to carry out purification or replace the filter material, which affects the continuous operation of the equipment to be cooled and causes resource idleness.

[0005] The present application provides a cooling working medium purification system, which is applied to a liquid cooling device. The purification system includes: A main pipeline, the input end of the main pipeline is connected to the liquid cooling device, and the main pipeline is used to output the cooling working medium in the liquid cooling device; A shunt pipeline, 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; A proportional valve, which is arranged on the first branch and / or the second branch; the proportional valve is used to adjust the flow rate of the cooling working medium in the first branch and the second branch; A filtering unit, which is arranged on the first branch; the filtering unit is used to filter the cooling working medium in the first branch; A return pipeline, the input end of the return pipeline is communicated with the output end of the shunt pipeline, the output end of the return pipeline is communicated with the liquid cooling device, and the return pipeline is used to return the filtered cooling working medium in the first branch and the unfiltered cooling working medium in the second branch to the liquid cooling device.

[0006] In a further embodiment, the filtering unit includes: a physical filtering module, a purification tower, a membrane separation module, and an electrostatic purification module, which are sequentially connected in series along the flow direction of the cooling working medium in the first branch; The physical filtering module includes a first filtering box, a second filtering box, and a third filtering box with gradually decreasing filtering pore diameters; The purification tower is configured to adsorb at least moisture, organic substances, and metal ions in the cooling working medium; The membrane separation module is configured to separate at least moisture, organic substances, and metal ions in the cooling working medium; The electrostatic purification module is configured to sterilize microorganisms in the cooling working medium.

[0007] In a further embodiment, the filtering unit further includes: A pure water flushing module for flushing the physical filtering module; The pure water flushing module includes a box for containing pure water and a first pump body; the input end of the first pump body is communicated with the box, and the output end of the first pump body is communicated with the physical filtering module; during flushing, the flow direction of the pure water is set to be opposite to the flow direction of the cooling working medium in the physical filtering module; A drain pipeline is provided on the physical filtering module, the input end of the drain pipeline is connected to the physical filtering module, and the output end of the drain pipeline is connected to the box, and the drain pipeline is used to allow the pure water to flow to the box after flushing is completed.

[0008] In a further embodiment, the purification system further includes: A differential pressure detection module is provided on the physical filtering module, the purification tower, the membrane separation module, and the electrostatic purification module; the differential pressure detection module is used to obtain and output the differential pressure data on the physical filtering module, the purification tower, the membrane separation module, and the electrostatic purification module; A leakage current detection module is provided on the electrostatic purification module; the leakage current detection module is used to obtain and output the current data on the electrostatic purification module.

[0009] In a further embodiment, the purification system further includes: A pollution degree detection module is provided on the liquid cooling device; the pollution degree detection module is used to obtain and output pollutant data of the cooling working medium, and the pollutant data at least includes pH value, turbidity, conductivity, and moisture concentration; A control module is connected to the pollution degree 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.

[0010] In a further embodiment, a second pump body is provided on the main pipeline, the input end of the second pump body is connected to the output end of the main pipeline, and the output end of the second pump body is simultaneously connected to the input ends of the first branch and the second branch.

[0011] In a further embodiment, the proportional valve is provided on the first branch and on the side close to the second pump body in the filtering unit, 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 filtering unit.

[0012] In a further embodiment, a switching valve is provided on the second branch, the input end of the switching valve is connected to the output end of the second pump body, and the output end of the switching valve is connected to the input end of the return pipeline.

[0013] This application also provides a method for purifying a cooling working medium. Based on a cooling working medium purification system as described above, the purification method includes the following steps: Obtain the current pollutant data of the cooling working medium to be purified, calculate the current opening degree of the proportional valve based on the current pollutant data, and adjust the flow rates of the cooling working medium in the first branch and the second branch based on the current opening degree; The cooling working medium in the first branch is filtered by the filtering unit, and the filtered cooling working medium in the first branch and the unfiltered cooling working medium in the second branch flow through the return pipeline and flow into the liquid cooling device.

[0014] In a further embodiment, calculating the current opening degree of the proportional valve based on the current pollutant data includes the following steps: Judge whether the current pollutant data meets the first condition. If so, calculate the current opening degree of the proportional valve based on the current pollutant data and using a preset model; Otherwise, determine that the current pollutant data is abnormal data, and re-obtain new pollutant data after a predetermined period; Wherein, the current pollutant data includes the current moisture concentration, and the first condition is that the current moisture concentration is greater than 0.

[0015] In a further embodiment, the preset model is as follows: ; wherein, K is the current opening degree, K base is the basic opening degree, 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 degree control range.

[0016] In a further embodiment, the purification method further comprises the following steps: Obtain real-time differential pressure data, and calculate the current differential pressure rising rate based on the differential pressure data , wherein, is the differential pressure value, t is the time, and d represents differentiation; Compare the current differential pressure rising rate with the differential pressure rising rate critical value M 0 to obtain a comparison result: If , then generate a reminder instruction; wherein, the reminder instruction includes reminding to replace the filter unit and / or flush the filter unit; If , then generate a keep status quo instruction.

[0017] In a further embodiment, the purification method further comprises the following steps: Preset flushing conditions, and flush the filter unit according to the flushing conditions; wherein, the flushing conditions include a standard flushing period and a standard flushing pressure; Obtain the current differential pressure rising rate , and compare the current differential pressure rising rate with a first differential pressure rising rate threshold M 1 , a second differential pressure rising rate threshold M 2 , and the differential pressure rising rate critical value M 0 to obtain a comparison result: When , then maintain the standard flushing period and increase the standard flushing pressure; When , then shorten the standard flushing period and increase the standard flushing pressure; At When, the standard flushing cycle is extended and the standard flushing pressure is maintained; Wherein, M 0 > M 1 > M 2 .

[0018] In a further embodiment, the purification method further includes the following steps: Obtain real-time current data I w , and compare the current data I w with a current threshold I 0 to obtain a comparison result: If I w > I 0 , an alarm instruction is generated; If I w ≤ I 0 , a keep status instruction is generated.

[0019] The present application also provides a liquid cooling device, including a cooling working medium purification system and an immersion tank as described above; The input end of the main pipeline is communicated with the immersion tank, the output end of the return pipeline is communicated with the immersion tank, and the return pipeline is used to return the filtered cooling working medium in the first branch and the unfiltered cooling working medium in the second branch to the immersion tank.

[0020] Through the present application, without interrupting the liquid cooling device, the cooling working medium in the liquid cooling device is input into the first branch and the second branch in the shunt pipeline through the main pipeline. The cooling working medium entering the first branch is filtered and purified by the filtering unit, and the cooling working medium entering the second branch is not filtered and purified; the filtered and purified cooling working medium and the unfiltered and purified cooling working medium are together incorporated into the return pipeline, and finally circulate back to the liquid cooling device through the return pipeline. Through the continuous return of the first branch and the second branch, the pollutants in the cooling working medium can be dynamically removed during the operation of the liquid cooling device, realizing the on-line continuous purification of the cooling working medium and avoiding the efficiency loss caused by the shutdown of the liquid cooling device. Description of the Drawings

[0021] To more clearly illustrate the embodiments of the present application, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of a cooling working medium purification system provided by an embodiment of the present application; Figure 2 It is a schematic principle diagram of a cooling working medium purification system provided by an embodiment of the present application; Figure 3 It is a module topology diagram of a cooling working medium purification system provided by an embodiment of the present application; Figure 4 It is a flowchart of a cooling working medium purification method provided by an embodiment of the present application.

[0023] Among them, the above-mentioned accompanying drawings include the following reference numerals: 1. Liquid cooling equipment; 2. Main pipeline; 3. First branch; 4. Second branch; 5. Proportion valve; 6. Physical filtration module; 61. First filtration box; 62. Second filtration box; 63. Third filtration box; 7. Purification tower; 8. Membrane separation module; 9. Electrostatic purification module; 10. Return pipeline; 11. Pure water flushing module; 111. Box body; 112. First pump body; 12. Drainage pipeline; 13. Pressure difference detection module; 14. Pollution degree detection module; 141. pH sensor; 142. Turbidity sensor; 143. Conductivity sensor; 144. Moisture sensor; 15. Second pump body; 16. Switch valve. Specific embodiments

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present application.

[0025] It should be noted that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. The terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. The terms "parallel", "perpendicular", and "equal" include the described situations and situations similar to the described situations, and the range of the similar situations is within the acceptable deviation range, where the acceptable deviation range is determined by those of ordinary skill in the art considering the measurements being discussed and the errors associated with the measurements of specific quantities (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallel and approximate parallel, where the acceptable deviation range of approximate parallel can be, for example, within 5° deviation; "perpendicular" includes absolute perpendicular and approximate perpendicular, where the acceptable deviation range of approximate perpendicular can also be, for example, within 5° deviation. "Equal" includes absolute equality and approximate equality, where the acceptable deviation range of approximate equality can be, for example, that the difference between the two equal ones is less than or equal to 5% of either one. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0026] In order to enable those skilled in the art of the present technology to better understand the solution of the present application, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0027] Currently, the common purification methods mainly include the method of offline distillation regeneration and the method of adsorption purification using static adsorbents. Using the method of offline distillation regeneration, this method can effectively separate impurities, but has the following disadvantages: (1) It can only be carried out regularly and cannot cope with the real-time pollution of the cooling working medium during operation; (2) It requires shutdown maintenance, resulting in interruptions in the operation of cooling equipment such as servers, affecting the operation of the equipment to be cooled; (3) The purification efficiency is limited, especially the removal effect on sub-micron particles or dissolved ionic impurities is not good; (4) Distillation involves high-temperature operations and consumes a large amount of energy.

[0028] Using a static adsorbent for adsorption purification, although the structure is simple, it has the following disadvantages: (1) The adsorption capacity is limited and needs to be replaced frequently, increasing the operation and maintenance costs and the dependence on labor; (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 pollution degree and also difficult to integrate into a compact liquid cooling system, which limits its application in high-density computing environments.

[0029] To solve the above problems, this application is proposed, and the following will illustrate this application in combination with specific embodiments.

[0030] An embodiment of this application provides a cooling working medium purification system (hereinafter referred to as the purification system), which is applied to a liquid cooling device 1. The purification system includes: a main pipeline 2, a shunt pipeline, a proportional valve 5, a filtering unit, and a return pipeline 10.

[0031] As Figure 1 and Figure 2 shown, the input end of the main pipeline 2 is connected to the liquid cooling device 1, and the main pipeline 2 is used to output the cooling working medium in the liquid cooling device 1. The input end of the shunt pipeline is connected to the output end of the main pipeline 2. The shunt pipeline 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 rate of the cooling working medium in the first branch 3 and the second branch 4. If the proportional valve 5 is installed on the first branch 3, a valve with a control switch is installed on the second branch 4 again; if the proportional valve 5 is installed on the second branch 4, a valve with a control switch is installed on the first branch 3 again; if the proportional valve 5 is installed on both the first branch 3 and the second branch 4 to control the flow of the cooling working medium. The filtering unit is arranged on the first branch 3, and the filtering unit is used to filter the cooling working medium in the first branch 3.

[0032] The input end of the return pipeline 10 is connected to the output end of the shunt pipeline, and the output end of the return pipeline 10 is connected to the liquid cooling device 1. The return pipeline 10 is used to return the filtered cooling working medium in the first branch 3 and the unfiltered cooling working medium in the second branch 4 to the liquid cooling device 1.

[0033] In the above technical solution, without interrupting the liquid cooling device 1, the main pipeline 2 inputs the cooling working medium in the liquid cooling device 1 into the first branch 3 and the second branch 4 in the shunt pipeline. The cooling working medium entering the first branch 3 is filtered and purified by the filtering unit, and the cooling working medium entering the second branch 4 is not filtered and purified; the filtered and purified cooling working medium and the unfiltered and purified cooling working medium are together fed into the return pipeline 10, and finally circulate back to the liquid cooling device 1 through the return pipeline 10, realizing the on-line continuous purification of the cooling working medium and avoiding the efficiency loss caused by the shutdown of the liquid cooling device 1.

[0034] It should be noted that the flow rate of the cooling working fluid in the first branch 3 and the second branch 4 is adjusted by the proportional valve 5, and the flow rate of the cooling working fluid in the second branch 4 is greater than that in the first branch 3. For example, the proportional valve 5 is used to adjust the flow rate of the cooling working fluid in the first branch 3 to account for 5% of the flow rate of the cooling working fluid in the main pipeline 2, and the flow rate of the cooling working fluid in the second branch 4 accounts for 95% of the flow rate of the cooling working fluid in the main pipeline 2; another example is that the proportional valve 5 is used to adjust the flow rate of the cooling working fluid in the first branch 3 to account for 20% of the flow rate of the cooling working fluid in the main pipeline 2, and the flow rate of the cooling working fluid in the second branch 4 accounts for 80% of the flow rate of the cooling working fluid in the main pipeline 2.

[0035] By setting the first branch 3 and the second branch 4, the cooling working fluid in the main pipeline 2 is shunted, and the flow rates of the cooling working fluid in the first branch 3 and the second branch 4 are regulated. Then, when purifying the cooling working fluid, only a small amount of the cooling working fluid passes through the filtering unit in the first branch 3, so that the filtering unit only needs to process a part of the cooling working fluid, slowing down the blockage of the filtering unit, extending the replacement cycle of the filtering unit and reducing the maintenance frequency of the filtering unit. In addition, only a small amount of the cooling working fluid passes through the filtering unit, reducing the flow resistance of the entire purification system, reducing the load and energy consumption of the pump in the purification system. Since most of the cooling working fluid does not pass through the filtering unit and directly flows to the return pipeline 10, the influence on most of the cooling working fluid during the filtering operation, such as increasing the temperature of the cooling working fluid, is avoided, thereby ensuring the cooling effect in the liquid cooling device. The pollutant concentration of the cooling working fluid is gradually reduced through the long-term circulation of the cooling working fluid in the first branch 3 and the second branch 4, and the cleanliness of the cooling working fluid is continuously maintained during long-term operation. Under the condition of not interrupting the operation of the liquid cooling device and the device to be cooled, the purification system can remove moisture, particulate matter, ionic impurities and organic decomposition products in the cooling working fluid in real time, and maintain the dielectric strength of the cooling working fluid (such as fluorinated liquid) ≥ 40 kV (ASTM D877), water content ≤ 50 ppm (ISO 760), and particulate matter concentration ≤ NAS 1638 Class 6 standard. The pollutant removal rate of the cooling working fluid in a single cycle in the first branch 3 is ≥ 90% (for moisture and particulate matter), the total pressure drop of the filtering unit in the first branch 3 is ≤ 0.2 MPa (the redundancy capacity of the second pump body 15 needs to cover this pressure loss), and the power consumption of the purification system is ≤ 5% of the total power of the second pump body 15.

[0036] It is worth mentioning that when replacing or maintaining the filtering unit, only the flow of the cooling working fluid in the first branch 3 needs to be interrupted. In other words, it is not necessary to interrupt the flow of the cooling liquid in the second branch 4 to replace or maintain the filtering unit, realizing on-line operation.

[0037] In a further embodiment, the filtering unit includes: a physical filtering 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 working fluid in the first branch 3.

[0038] The physical filtration module 6 includes a first filtration tank 61, a second filtration tank 62, and a third filtration tank 63 with gradually decreasing filtration pore sizes. The first filtration tank 61 uses a stainless steel sintered filter element with a filtration pore size of 10 μm and a compressive strength of ≥1.5 MPa; the second filtration tank 62 uses a ceramic fiber filter element with a filtration pore size of 1 μm and a temperature resistance of 200 °C; the third filtration tank 63 uses a PTFE membrane filter element with a filtration pore size of 0.1 μm, and the PTFE membrane filter element is used for hydrophobic anti-blocking.

[0039] The purification tower 7 is used to adsorb at least moisture, organic substances, and metal ions in the cooling working fluid. In this embodiment, the material of the tower body of the purification tower 7 is 316L stainless steel (lined with PTFE for corrosion prevention), and three different adsorbents are respectively arranged in the purification tower 7: 3A molecular sieve adsorbent, coconut shell activated carbon adsorbent, and strong acid cation adsorbent. The 3A molecular sieve adsorbent is used to adsorb moisture with a capacity of 200 g / L; the coconut shell activated carbon adsorbent is used to adsorb organic pollutants (Vocs) with a capacity of 150 g / L; the strong acid cation adsorbent is used to adsorb metal ions (such as Fe³ and Cu² ions) with a capacity of 100 g / L.

[0040] The membrane separation module 8 is used to separate at least moisture, organic substances, and metal ions in the cooling working fluid. The membrane material in the membrane separation module 8 uses a PTFE hollow fiber membrane, which has hydrophobic characteristics, with a pore size of 0.02 μm and a porosity of ≥80%. In addition, the surface of the membrane material is coated with perfluoroalkylsilane (to facilitate reducing the attachment of organic substances).

[0041] The electrostatic purification module 9 is used to sterilize microorganisms in the cooling working fluid. The electrostatic purification module 9 uses a ruthenium-plated titanium plate with excellent corrosion resistance to fluorinated liquid. The voltage gradient is set to 5 kV / cm, effectively capturing charged particles of 0.5 - 1 μm and improving the purification efficiency. To prevent the electrolysis of the fluorinated liquid, the electrostatic purification module 9 is equipped with a current limiting function, and the operating current ≤15 μA to ensure safe and stable operation. An insulating protection is carried out between the plate and the shell using a perfluoroether rubber sealing ring to ensure the long-term reliable operation of the module.

[0042] As Figure 1 shown, the input end of the first filtration tank 61 is connected to the output end of the proportional valve 5, the output end of the first filtration tank 61 is connected to the input end of the second filtration tank 62, the output end of the second filtration tank 62 is connected to the input end of the third filtration tank 63, the output end of the third filtration tank 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 return pipeline 10.

[0043] In the above technical solution, through the multi-stage physical filtration module 6 (including the first filtration tank 61, the second filtration tank 62, and the third filtration tank 63 with gradually decreasing pore sizes), particulate impurities of different particle sizes are efficiently removed, especially improving the capture efficiency of sub-micron particles. At the same time, the purification tower 7 can adsorb and remove moisture, organic matter, and metal ions in the cooling working medium, and the membrane separation module 8 further realizes the selective separation of moisture, organic matter, and metal ions, enhancing the removal ability of dissolved ionic impurities. The electrostatic purification module 9 efficiently sterilizes microorganisms in the cooling working medium to comprehensively address the problem of biological contamination. The filtration unit realizes the comprehensive treatment of various types of pollutants (particles, ions, organic matter, microorganisms), significantly improving the purification efficiency and scope of application, and effectively solving the problems of low efficiency and weak pertinence of traditional purification means.

[0044] In a further embodiment, the filtration unit further includes: a pure water flushing module 11 for flushing the physical filtration module 6.

[0045] The pure water flushing module 11 includes: a box body 111 for containing pure water and a first pump body 112. The input end of the first pump body 112 is communicated with the box body 111, and the output end of the first pump body 112 is communicated with the physical filtration module 6; during flushing, the flow direction of the pure water is set to be opposite to the flow direction of the cooling working medium in the physical filtration module 6. The first pump body 112 is a booster water pump.

[0046] A drainage pipeline 12 is provided on the physical filtration module 6. The input end of the drainage pipeline 12 is communicated with the physical filtration module 6, and the output end of the drainage pipeline 12 is connected to the box body 111. The drainage pipeline 12 is used to make the pure water flow to the box body 111 after flushing is completed.

[0047] In the above technical solution, starting the first pump body 112 will cause the pure water in the box body 111 to sequentially flush the third filtration tank 63, the second filtration tank 62, and the first filtration tank 61 in the filtration module, washing away the impurities on the filter elements of the first filtration tank 61, the second filtration tank 62, and the third filtration tank 63, preventing the filter elements from being blocked, ensuring the filtration effect, and the flushed pure water flows back into the box body 111 through the drainage pipeline 12. After flushing is completed, the filtration module is purged with clean compressed air or dried by heating to minimize the residual moisture as much as possible, preventing microbial contamination or affecting the purity of the cooling working medium.

[0048] It is worth mentioning that during the flushing process in this embodiment, the flow direction of pure water is set to be opposite to the flow direction of the cooling working medium in the physical filtration module 6. During the filtration process, particulate impurities in the cooling working medium will gradually deposit on the surface and internal pores of the filter element. Larger particles are intercepted by the surface layer of the filter element, while smaller particles penetrate deeper into the filter element. Reverse flushing can more effectively push out these deeply intercepted pollutants, improving the cleaning effect. Moreover, reverse flushing can change the fluid path, increasing the overall cleaning coverage rate and reducing pollutant residues. In addition, for structures with a certain pore gradient such as stainless steel sintered filter elements, reverse flushing can prevent structural damage caused by excessive internal pressure of the filter material during forward high-pressure flushing, protecting the integrity of the filter element. It should be noted that the first pump body 112 is prohibited from starting before the proportional valve 5 is closed; after flushing is completed, the proportional valve 5 is restarted after a delay period (such as 5s, 10s, 15s, etc.) to resume filtration.

[0049] In a further embodiment, the purification system further includes: a differential pressure detection module 13 and a leakage current detection module.

[0050] The differential pressure detection module 13 is arranged on the physical filtration module 6, the purification tower 7, the membrane separation module 8, and the electrostatic purification module 9. The differential pressure detection module 13 is used to obtain and output the differential pressure data on the physical filtration module 6, the purification tower 7, the membrane separation module 8, and the electrostatic purification module 9. The differential pressure detection module 13 uses a differential pressure sensor with a measurement range of 0 - 0.1 MPa and an accuracy of ±1%. As Figure 1 shown, the differential pressure sensor detects the differential pressure between the input end and the output end of the first filtration tank 61. The differential pressure detection of the second filtration tank 62, the third filtration tank 63, the purification tower 7, the membrane separation module 8, and the electrostatic purification module 9 is the same as that of the first filtration tank 61, which will not be elaborated here.

[0051] The leakage current detection module is arranged on the electrostatic purification module 9; the leakage current detection module is used to obtain and output the current data on the electrostatic purification module 9. The leakage current detection module uses a current sensor.

[0052] In the above technical solution, by using a differential pressure sensor to monitor and obtain the differential pressure data of the input end and the output end of the first filtration tank 61, the second filtration tank 62, the third filtration tank 63, the purification tower 7, the membrane separation module 8, and the electrostatic purification module 9 in real time, and using the differential pressure data to judge whether they are blocked. If the differential pressure rising rate > 0.01 MPa / h, a replacement reminder is triggered to realize timely replacement of the blocked components and ensure the filtration effect. By using a current sensor to monitor the current on the electrostatic purification module 9 in real time, when the monitored current is greater than 15 μA, an alarm reminder is triggered to effectively prevent potential safety hazards caused by overcurrent or leakage current.

[0053] In a further embodiment, the purification system further includes: a contamination detection module 14 and a control module.

[0054] The contamination detection module 14 is installed on the liquid cooling device 1; the contamination detection module 14 is used to obtain and output the pollutant data of the cooling working medium, and the pollutant data at least includes pH value, turbidity, conductivity, and moisture concentration. The contamination detection module 14 at least includes a pH sensor 141, a turbidity sensor 142, a conductivity sensor 143, and a moisture sensor 144.

[0055] As Figure 3 shown, the control module is respectively communicatively connected to the contamination detection module 14, the differential pressure detection module 13, and the leakage current detection module; the control module is used to receive the pollutant data, differential pressure data, and current data and make a judgment based on the pollutant data, differential pressure data, and current data to obtain a judgment result, and the control module generates corresponding instructions based on the judgment result. The control module includes but is not limited to a programmable logic controller and an industrial computer.

[0056] In the above technical solution, the control module receives the pollutant data, differential pressure data, and current data obtained by real-time monitoring of the contamination detection module 14, the differential pressure detection module 13, and the leakage current detection module. The control module makes corresponding judgments based on the pollutant data, differential pressure data, and current data to obtain a judgment result, and generates corresponding instructions based on the judgment result. The instructions include but are not limited to adjusting the opening of the proportional valve 5, alarming, changing the flushing conditions, maintaining the status quo, etc. The control module timely discovers abnormal data during the operation of the purification system based on the detection data, and automatically adjusts the purification strategy based on the abnormal data to achieve dynamic intelligent control and improve the reliability and stability of the purification system. It is worth mentioning that the purification system includes a human-machine interface, which can display key data such as pH value, turbidity, conductivity, moisture concentration, and differential pressure in real time, facilitating the staff to timely grasp the operation status of the purification system.

[0057] In a further embodiment, a second pump body 15 is provided on the main pipeline 2. The input end of the second pump body 15 is connected to the output end of the main pipeline 2, and the output end of the second pump body 15 is simultaneously connected to the input ends of the first branch 3 and the second branch 4. The second pump body 15 is a booster water pump.

[0058] In the above technical solution, the second pump body 15 pressurizes the cooling working medium, and the water pumps pressurized by the second pump body 15 respectively flow into the first branch 3 and the second branch 4.

[0059] In a further embodiment, the proportional valve 5 is provided on the first branch 3 and is located on the side close to the second pump body 15 in the filtering unit. 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 filtering unit.

[0060] In the above technical solution, the proportional valve 5 controls the opening degree through PID to control the flow rate of the cooling working medium entering the first branch 3, and further controls the purification amount of the cooling working medium. In this embodiment, the opening degree range of the proportional valve 5 is 5% - 35%.

[0061] In a further embodiment, a switching valve 16 is provided on the second branch 4. The input end of the switching valve 16 is connected to the output end of the second pump body 15, and the output end of the switching valve 16 is connected to the input end of the return pipeline 10.

[0062] In the above technical solution, the switching valve 16 is an electric ball valve. During the operation of the purification system, the electric ball valve is in an open state. The purification amount of the cooling working medium in the first branch 3 is adjusted by adjusting the opening degree of the proportional valve 5, and the remaining cooling working medium flows through the second branch 4 to the return pipeline 10 and returns to the liquid cooling device 1.

[0063] It should be noted that in this embodiment, the flow rate of the cooling working medium in the first branch 3 is set to be less than that in the second branch 4. That is to say, most of the cooling working medium flowing out of the main pipeline 2 is not filtered and quickly returns to the liquid cooling device 1. In the filtration unit of this embodiment, a multi-stage filtration module is provided. Due to the resistance of the filter material, the flow rate of the cooling working medium in the first branch 3 is reduced when flowing through the filtration unit, which easily causes the cooling working medium to accumulate or stay in the filtration unit, and the heat exchange efficiency in the liquid cooling device 1 decreases. To solve this problem, a second branch is designed. Through the rapid return of a large amount of cooling working medium in the second branch 4, it is ensured that there is still enough cooling working medium in the liquid cooling device 1 to maintain the cooling effect of the liquid cooling device 1.

[0064] Another embodiment of the present application provides a method for purifying a cooling working medium (hereinafter referred to as the purification method), based on a cooling working medium purification system as in the above embodiment, as Figure 4 shown, the purification method includes the following steps: Obtain the current pollutant data of the cooling working medium to be purified, calculate the current opening degree of the proportional valve 5 based on the current pollutant data, and adjust the flow rates of the cooling working medium in the first branch and the second branch based on the current opening degree; The cooling working medium in the first branch is filtered by the filtration unit, and the filtered cooling working medium in the first branch and the unfiltered cooling working medium in the second branch flow through the return pipeline 10 to the liquid cooling device 1.

[0065] In the above technical solution, in this embodiment, the opening degree of the proportional valve 5 is dynamically adjusted in real time based on the pollutant data of the cooling working medium to be purified in the liquid cooling device 1. When the pollutant concentration in the pollutant data is high, the opening degree of the proportional valve 5 is increased to increase the purification amount of the cooling working medium in the first branch and accelerate purification. Conversely, the opening degree of the proportional valve 5 is decreased to avoid damage caused by over-purification and reduce mechanical wear of structures such as filter elements.

[0066] In a further embodiment, calculating the current opening degree of the proportional valve 5 based on the current pollutant data includes the following steps: Judge whether the current pollutant data meets the first condition. If so, calculate the current opening degree of the proportional valve 5 based on the current pollutant data and using a preset model; Conversely, determine that the current pollutant data is abnormal data, and re-obtain new pollutant data after a predetermined period; Wherein, the current pollutant data includes the current moisture concentration, and the first condition is that the current moisture concentration is greater than 0.

[0067] In the above technical solution, in this embodiment, the current opening degree 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 > 0, the current opening degree of the proportional valve 5 is calculated using a preset model, which responds to moisture fluctuations in real time, avoids a decrease in the dielectric strength of the cooling working medium caused by excessive moisture, and diverts and purifies as needed, reducing ineffective circulation and suppressing losses caused by over-purification, and reducing mechanical wear of the filter element.

[0068] It should be noted that when it is detected that the current moisture concentration ≤ 0, it is determined that the current moisture concentration is abnormal data, the abnormal data is excluded, and new moisture concentration is re-obtained after a predetermined period (such as 0.5 s, 1 s, 2 s, or 3 s, etc.) until the new moisture concentration > 0, and then the opening degree of the proportional valve 5 is calculated according to the new moisture concentration.

[0069] In a further embodiment, the preset model is as follows: ; In the formula, K is the current opening degree, K base is the basic opening degree, 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 degree control range, K base =y 1 。

[0070] In the above technical solution, the opening control range is set based on actual purification requirements such as the properties of the cooling working fluid and purification efficiency. 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 coefficient, and target moisture concentration are also set based on actual purification requirements. For the convenience of understanding, specific numerical values are used in the following description: In this embodiment, the basic opening is set to 5%, the gain coefficient is set to 12%, and the target moisture concentration is set to 50 ppm.

[0071] Based on the current moisture concentration and the above equations (1) and (2), calculate the current opening and control the current opening within ( y 1 ,y 2 ). For example, when C w = 100 ppm, the K calculated using equation (1) is 13.32%, and then using equation (2) to get K = 13.32%. Finally, the current opening of proportional valve 5 is adjusted to 13.32%. Another example, when = 25 ppm, the K calculated using equation (1) is -3.32%, and then using equation (2) to get K = 5%. Finally, the current opening of proportional valve 5 is adjusted to 5%. Another example, when C w = 650 ppm, the K calculated using equation (1) is 35.78%, and then using equation (2) to get K = 35%. Finally, the current opening of proportional valve 5 is adjusted to 35%.

[0072] It is worth mentioning that in this embodiment, the opening of proportional valve 5 is limited within ( y 1 ,y 2 ), which can ensure the balanced dynamic cycle of the entire purification system. If the opening of proportional valve 5 is less than y 1 , the purification flow rate of the cooling working fluid in the first branch 3 will be too small, resulting in a low pollutant removal rate. The conductivity and particulate concentration of the cooling working fluid in the liquid cooling equipment are still not effectively reduced, and the filtration unit does not fully participate in the reaction, resulting in a low utilization rate of the filtration unit. If the opening of proportional valve 5 is greater thany 2 Then, the purification flow rate of the cooling working medium in the first branch 3 is excessive. The excessive flow rate will accelerate the consumption rate of each module in the filtration unit, and the modules of the filtration unit need to be frequently replaced; the excessive flow rate will bring too fast a flow velocity, resulting in incomplete purification of the cooling working medium and reducing the purification efficiency.

[0073] In a further embodiment, the purification method further comprises the following steps: Obtain real-time differential pressure data, and calculate the current differential pressure rising rate based on the differential pressure data , where is the differential pressure value, t is the time, and d represents differentiation; Compare the current differential pressure rising rate with the critical differential pressure rising rate M 0 to obtain a comparison result: If , a reminder instruction is generated; wherein, the reminder instruction includes a reminder to replace the filtration unit and / or flush the filtration unit; If , a keep-the-status quo instruction is generated.

[0074] In the above technical solution, the real-time differential pressure data is obtained by the differential pressure detection module 13, and the control module calculates the current differential pressure rising rate based on the differential pressure data , and compares the current differential pressure rising rate with the critical differential pressure rising rate M 0 : If , it indicates that the modules in the filtration unit (such as the first filtration box 61, the purification tower 7, etc.) are blocked, and a reminder instruction is generated to remind the staff to replace the filtration unit and / or flush the filtration unit (such as replacing the purification tower 7 and flushing the first filtration box 61). If , it indicates that the modules in the filtration unit are not blocked and the working state is good, and a keep-the-status quo instruction is generated.

[0075] It should be noted that the specific value of the critical differential pressure rising rate M 0 is determined based on actual requirements. For the convenience of understanding, the critical differential pressure rising rate M 0 in this embodiment is set to 0.01 MPa / h. By obtaining real-time differential pressure data, it is judged whether the modules in the filtration unit are blocked, and the blockage situation is processed in a timely manner to ensure the purification efficiency of the purification system.

[0076] In a further embodiment, the purification method further comprises the following steps: Preset the flushing conditions and flush the filtration unit according to the flushing conditions; wherein, the flushing conditions include a standard flushing cycle and a standard flushing pressure; Obtain the current differential pressure rising rate , and use the current differential pressure rising rate to be compared with a first differential pressure rising rate threshold M 1 , a second differential pressure rising rate threshold M 2 , and a differential pressure rising rate critical value M 0 respectively to obtain a comparison result: When , maintain the standard flushing cycle and increase the standard flushing pressure; When , shorten the standard flushing cycle and increase the standard flushing pressure; When , extend the standard flushing cycle and maintain the standard flushing pressure; Wherein, M 0 > M 1 > M 2 .

[0077] In the above technical solution, the flushing process is implemented by using the above pure water flushing module 11. The standard flushing cycle, the standard flushing pressure, the first differential pressure rising rate threshold M 1 , and the second differential pressure rising rate threshold M 2 are all set based on actual requirements. For the convenience of understanding, the following takes specific numerical examples to illustrate: In this embodiment, the standard flushing cycle is set to 30 min, and the flushing pressure is set to 0.8 Mpa. That is to say, initially, the pure water flushing module 11 backwashes the physical filtration module 6 once every 30 min, the flushing pressure is 0.8 Mpa, and the flushing duration is 3 min (or 5 min). In this embodiment, the first differential pressure rising rate threshold is set to 0.005 MPa / h, and the second differential pressure rising rate threshold M 2 is set to 0.002 MPa / h.

[0078] When >0.005 MPa / h, maintain the standard flushing cycle and increase the standard flushing pressure, flush once every 30 min, and the flushing pressure is 1.0 Mpa.

[0079] When When it is > 0.01 MPa / h, the standard flushing cycle is shortened and the standard flushing pressure is increased, flushing once every 10 min, and the flushing pressure is 1.0 Mpa (or higher).

[0080] at When it is < 0.002 MPa / h, the standard flushing cycle is extended and the standard flushing pressure is maintained, flushing once every 60 min, and the flushing pressure is 0.8 Mpa.

[0081] Dynamically adjust the flushing cycle and flushing pressure through differential pressure data, making the reverse flushing more intelligent and automated, avoiding over-cleaning caused by fixed-cycle flushing, and dynamic control can not only prevent mechanical fatigue of the filter element caused by frequent flushing, but also timely remove pollutants, preventing damage to the filter element structure or performance degradation caused by long-term accumulation.

[0082] In a further embodiment, the purification method further includes the following steps: Obtain real-time current data I w , and compare the current data I w with a current threshold I 0 to obtain a comparison result: If I w > I 0 , an alarm instruction is generated; If I w ≤ I 0 , a keep-the-status quo instruction is generated.

[0083] In the above technical solution, the current data I w is obtained by the above leakage current detection module, and the control module receives the current data I w and compares it with the current threshold I 0 . If I w > I 0 , it means that the current on the electrostatic purification module 9 exceeds the threshold, and an alarm instruction is generated to remind the staff to make corresponding treatment; if I w ≤ I 0 , it means that the current on the electrostatic purification module 9 is within the safe range, and a keep-the-status quo instruction is generated. It should be noted that the current threshold I0 Set based on actual requirements. For the convenience of understanding, the current threshold in this embodiment I 0 is set to 15 μA. By real-time monitoring of the current current data on the electrostatic purification module 9 I w , and promptly responding to the situation where the current current data is too high to ensure the safe operation of the purification system.

[0084] Another embodiment of the present application provides a liquid cooling device, including a cooling working fluid purification system and an immersion tank described in the above embodiment; The input end of the main pipeline 2 is communicated with the immersion tank, and the output end of the return pipeline 10 is communicated with the immersion tank. The return pipeline 10 is used to return the filtered cooling working fluid in the first branch 3 and the unfiltered cooling working fluid in the second branch 4 to the immersion tank.

[0085] The cooling working fluid in the immersion tank is input into the first branch 3 and the second branch 4 through the main pipeline 2. The cooling working fluid entering the first branch 3 is filtered and purified by the filtering unit, and the cooling working fluid entering the second branch 4 is not filtered and purified; the filtered and purified cooling working fluid and the unfiltered and purified cooling working fluid are merged into the return pipeline 10 together, and finally circulate back to the immersion tank through the return pipeline 10, and the online purification of the cooling working fluid is realized through the above cycle.

[0086] Through the online purification of the cooling working fluid, the service life of the cooling working 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 the resource utilization efficiency. At the same time, the shutdown operation (usually 3 - 7 days) required in the traditional offline purification process is avoided, ensuring the operation of the equipment to be cooled. This embodiment also reduces the dependence on manual detection and frequent replacement of the cooling working fluid, reduces the maintenance intensity, and improves the stability and continuity of the system operation. Through the cyclic purification method, not only the consumption of water resources is reduced, but also the environmental impact of the discharge of the cooling working fluid is reduced.

[0087] In this article, specific examples are used to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can still be made to the present application, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. A cooling working fluid purification system, applied to a liquid cooling device (1), is characterized in that, The purification system includes: A main pipeline (2), the input end of the main pipeline (2) is connected to the liquid cooling device (1), and the main pipeline (2) is used to output the cooling working medium in the liquid cooling device (1); A shunt pipeline, the input end of the shunt pipeline is connected to the output end of the main pipeline (2), and the shunt pipeline includes a first branch (3) and a second branch (4) connected in parallel; A proportional valve (5) provided on the first branch (3) and / or the second branch (4); the proportional valve (5) is used to adjust the flow rate of the cooling working medium in the first branch (3) and the second branch (4); A filtering unit provided on the first branch (3); the filtering unit is used to filter the cooling working medium in the first branch (3); A return pipeline (10), the input end of the return pipeline (10) is connected to the output end of the shunt pipeline, and the output end of the return pipeline (10) is connected to the liquid cooling device (1), and the return pipeline (10) is used to return the filtered cooling working medium in the first branch (3) and the unfiltered cooling working medium in the second branch (4) to the liquid cooling device (1).

2. The purification system of a cooling working medium according to claim 1, wherein The filtering unit includes: a physical filtering module (6), a purification tower (7), a membrane separation module (8), and an electrostatic purification module (9) arranged in series in sequence along the flow direction of the cooling working medium in the first branch (3); The physical filtering module (6) includes a first filtering box (61), a second filtering box (62), and a third filtering box (63) with gradually decreasing filtering pore diameters; The purification tower (7) is configured to adsorb at least moisture, organic substances, and metal ions in the cooling working medium; The membrane separation module (8) is configured to separate at least moisture, organic substances, and metal ions in the cooling working medium; The electrostatic purification module (9) is configured to sterilize microorganisms in the cooling working medium.

3. The cooling working medium purification system according to claim 2, characterized in that, The filtering unit further includes: A pure water flushing module (11) for flushing the physical filtering module (6); The pure water flushing module (11) includes: a box body (111) for containing pure water and a first pump body (112); the input end of the first pump body (112) is connected to the box body (111), and the output end of the first pump body (112) is connected to the physical filtering module (6); during flushing, the flow direction of the pure water is set to be opposite to the flow direction of the cooling working medium in the physical filtering module (6); A drain pipeline (12) is provided on the physical filtering module (6), the input end of the drain pipeline (12) is connected to the physical filtering module (6), and the output end of the drain pipeline (12) is connected to the box body (111), and the drain pipeline (12) is used to allow the pure water to flow to the box body (111) after the flushing is completed.

4. A cooling working fluid purification system according to claim 2, characterized in that, The purification system further includes: A differential pressure 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 differential pressure detection module (13) is used to acquire and output differential pressure 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 acquire and output current data on the electrostatic purification module (9).

5. The purification system of a cooling working medium according to claim 4, characterized in that, The purification system further includes: A contamination detection module (14) is provided on the liquid cooling device (1); the contamination detection module (14) is used to acquire and output pollutant data of the cooling working medium, and the pollutant data at least includes pH value, turbidity, conductivity, and moisture concentration. A control module is connected to the contamination detection module (14), the differential pressure detection module (13), and the leakage current detection module; the control module is used to receive the pollutant data, the differential pressure data, and the current data and make judgments.

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

7. A cooling working fluid purification system according to claim 6, characterized in that, The proportional valve (5) is provided on the first branch (3) and is located on the side close to the second pump body (15) in the filtration unit. 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 filtration unit.

8. A cooling working medium purification system according to claim 7, characterized in that, A switching valve (16) is provided on the second branch (4). The input end of the switching valve (16) is connected to the output end of the second pump body (15), and the output end of the switching valve (16) is connected to the input end of the return pipeline (10).

9. A method for purifying a cooling working medium, based on a cooling working medium purification system according to any one of claims 1 to 8, characterized in that, The purification method includes the following steps: Acquire the current pollutant data of the cooling working medium to be purified, calculate the current opening of the proportional valve (5) based on the current pollutant data, and adjust the flow rates of the cooling working medium in the first branch (3) and the second branch (4) based on the current opening. The cooling working medium in the first branch (3) is filtered by the filtration unit, and the filtered cooling working medium in the first branch (3) and the unfiltered cooling working medium in the second branch (4) flow through the return pipeline (10) and flow into the liquid cooling device (1).

10. A method for purifying a cooling working fluid according to claim 9, characterized in that, The calculating the current opening of the proportional valve (5) based on the current pollutant data includes the following steps: Judge whether the current pollutant data meets the first condition. If so, calculate the current opening of the proportional valve (5) based on the current pollutant data and using a preset model. Otherwise, determine that the current pollutant data is abnormal data, and re-acquire new pollutant data after a predetermined period. Wherein, the current pollutant data includes the current moisture concentration, and the first condition is that the current moisture concentration is greater than 0.

11. A method for purifying a cooling working medium according to claim 10, characterized in that, The preset model is as follows: ； Wherein, K is the current opening degree, K base is the basic opening degree, and 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 degree control range.

12. A method for purifying a cooling working medium according to claim 9, characterized in that, The purification method further includes the following steps: Obtain real-time differential pressure data and calculate the current differential pressure rising rate based on the differential pressure data , where is the differential pressure value, t is the time, and d represents differentiation; Compare the current pressure difference rising rate with the critical value of the pressure difference rising rate M 0 to obtain a comparison result: If , a reminder instruction is generated; wherein, the reminder instruction includes a reminder to replace the filter unit and / or flush the filter unit; If , a keep - as - is instruction is generated.

13. A method for purifying a cooling working medium according to claim 12, characterized in that, The purification method further includes the following steps: Flush conditions are preset, and the filtration unit is flushed according to the flush conditions; wherein, the flush conditions include a standard flush cycle and a standard flush pressure; Obtain the current differential pressure rising rate and compare the current differential pressure rising rate with a first differential pressure rising rate threshold M 1 , a second differential pressure rising rate threshold M 2 , and a differential pressure rising rate critical value M 0 respectively to obtain a comparison result: When is reached, the standard flushing cycle is maintained and the standard flushing pressure is increased; When the standard flushing cycle is shortened and the standard flushing pressure is increased; When occurs, extend the standard flushing cycle and maintain the standard flushing pressure; Among them, M 0 > M 1 > M 2 。 14. A method for purifying a cooling working medium according to claim 9, characterized in that, The purification method further includes the following steps: Obtain real-time current data I w , and compare the current data I w with a current threshold I 0 to obtain a comparison result: If I w > I 0 , an alarm instruction is generated; If I w ≤ I 0 , a keep - as - is instruction is generated.

15. A liquid cooling device, characterized in that, including a cooling working medium purification system and an immersion tank according to any one of claims 1 to 8; The input end of the main pipeline (2) is communicated with the immersion tank, the output end of the return pipeline (10) is communicated with the immersion tank, and the return pipeline (10) is used to return the filtered cooling working medium in the first branch (3) and the unfiltered cooling working medium in the second branch (4) to the immersion tank.

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