CDU system

Abstract

The CDU system comprises a primary side pipeline, a secondary side pipeline and a heat exchanger, the primary side pipeline is used for being connected with cooling equipment, the secondary side pipeline comprises a secondary side main pipeline and a detection pipeline, the secondary side main pipeline is used for being connected with equipment to be cooled, the two ends of the detection pipeline are connected to different point positions of the secondary side main pipeline respectively, and the detection pipeline is connected with the heat exchanger. The heat exchanger is respectively connected with the primary side pipeline and the secondary side main pipeline, a cooling medium in the primary side pipeline exchanges heat with a cooling medium in the secondary side main pipeline through the heat exchanger, and a water quality detection device is arranged on the detection pipeline and is used for detecting the quality of the cooling medium in the secondary side main pipeline. The continuous and real-time water quality data is provided through the water quality detection device, so that online quality detection of the cooling medium in the secondary side main pipeline is realized, the heat dissipation efficiency of the CDU system and the stability and safety of the system are ensured, and normal work of the equipment to be subjected to heat dissipation is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of temperature control equipment, in particular to a CDU system. BACKGROUND

[0002] The liquid cooling temperature control unit, also known as coolant distribution unit (English full name: Coolant Distribution Unit, for short: CDU), refers to a system for distributing cooling liquid between liquid-cooled electronic equipment, which has secondary side flow distribution, pressure control, temperature control, physical isolation and anti-condensation functions. The working principle of the liquid cooling temperature control unit is that the secondary side working medium cools the server and then enters the plate heat exchanger. The primary side working medium is filtered and flow-regulated and then enters the plate heat exchanger, indirectly exchanges heat with the secondary side working medium, and is then transported to an external cooling tower or air cooler, etc., to release heat to the outdoor.

[0003] In the process of implementing the present application, the inventors found that at least the following technical problems exist in the prior art:

[0004] In the prior art, the CDU system is connected to the secondary side and the server, and the water quality parameter in the secondary side directly affects the heat dissipation efficiency of the CDU system and the stability and safety of the system. The reduction of the heat dissipation efficiency of the CDU system will lead to the decline of the heat dissipation effect of the server, thereby affecting the normal work of the server. CONTENT OF THE UTILITY MODEL

[0005] In order to overcome the above-mentioned problems existing in the prior art, the main purpose of the present application is to provide a CDU system capable of online detecting water quality to ensure heat dissipation efficiency.

[0006] In order to achieve the above-mentioned purpose, the present application specifically adopts the following technical solutions:

[0007] A CDU system, comprising:

[0008] A primary side pipeline for connecting with a cooling device;

[0009] A secondary side pipeline, the secondary side pipeline comprising a secondary side main pipeline and a detection pipeline, the secondary side main pipeline being used for connecting with a device to be cooled, and the two ends of the detection pipeline being respectively connected to different points of the secondary side main pipeline;

[0010] A heat exchanger connected with the primary side pipeline and the secondary side main pipeline respectively, and the cooling medium in the primary side pipeline and the cooling medium in the secondary side main pipeline performing heat exchange through the heat exchanger;

[0011] The water quality detection device is arranged on the detection pipeline, and is used for detecting the quality of the cooling medium in the secondary side main pipeline.

[0012] In some embodiments, the secondary side main pipeline is provided with a circulating pump, and the secondary side main pipeline comprises a liquid supply pipeline and a liquid return pipeline, the circulating pump is used to drive the cooling medium in the secondary side main pipeline to flow to the equipment to be cooled through the liquid supply pipeline, and then flow to the heat exchanger through the liquid return pipeline, and the detection pipeline is in communication with the liquid supply pipeline and the liquid return pipeline, respectively.

[0013] In some embodiments, the secondary side pipeline further comprises a bypass pipeline in communication with the liquid supply pipeline and the liquid return pipeline, respectively, the bypass pipeline is provided with an electric two-way valve and a reverse osmosis device, the electric two-way valve is used to control the flow of the cooling medium in the bypass pipeline, and the reverse osmosis device is used to filter impurities in the bypass pipeline.

[0014] In some embodiments, the bypass pipeline is further provided with two first butterfly valves, and the electric two-way valve and the reverse osmosis device are located between the two first butterfly valves, respectively.

[0015] In some embodiments, the CDU system further comprises a controller connected with the water quality detection device and the electric two-way valve, respectively, and used to control the opening of the electric two-way valve based on the detection result of the water quality detection device.

[0016] In some embodiments, the secondary side pipeline further comprises a liquid supplement pipeline, one end of the liquid supplement pipeline is connected to the secondary side main pipeline and located at the input end of the circulating pump, the other end of the liquid supplement pipeline is connected to a liquid supplement tank, and the liquid supplement pipeline is provided with a liquid supplement pump, the liquid supplement pump is used to drive the liquid in the liquid supplement tank to flow into the secondary side main pipeline from the liquid supplement pipeline.

[0017] In some embodiments, the input end of the circulating pump and the input end of the equipment to be cooled are respectively provided with a safety valve, and the liquid supplement tank is connected with the safety valve.

[0018] In some embodiments, the secondary side main pipeline is further provided with a manual exhaust valve and an automatic exhaust valve, and the manual exhaust valve and the automatic exhaust valve are located at the input end of the circulating pump, respectively.

[0019] In some embodiments, the secondary side main pipeline is further provided with a secondary side filter, a second butterfly valve, a third butterfly valve and a fourth butterfly valve, the second butterfly valve is located at the input end of the secondary side filter, the third butterfly valve is located at the output end of the secondary side filter, and the fourth butterfly valve is provided in parallel with the secondary side filter, the second butterfly valve and the third butterfly valve, respectively.

[0020] In some embodiments, an exhaust valve and a drain valve are provided between the second butterfly valve and the third butterfly valve.

[0021] Compared with the prior art, the CDU system provided by the application has at least the following beneficial effects:

[0022] The two ends of the detection pipeline are connected to different points of the secondary side main pipeline, so that the cooling medium in the secondary side pipeline can be distributed to the secondary side main pipeline and the detection pipeline, and the water quality detection device is arranged on the detection pipeline, and the water quality detection device is used for detecting the quality of the cooling medium in the secondary side main pipeline. Continuous and real-time water quality data is provided by the water quality detection device, so that online quality detection of the cooling medium in the secondary side main pipeline is realized, and the heat dissipation efficiency of the CDU system and the stability and safety of the system are ensured, so that the normal work of the equipment to be cooled is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The structure schematic diagram of the CDU system provided by the embodiment of the application is shown in the figure;

[0024] Figure 2 The structure schematic diagram of the secondary side pipeline of the CDU system provided by the embodiment of the application is shown in the figure;

[0025] Figure 3 The structure schematic diagram of the primary side pipeline of the CDU system provided by the embodiment of the application is shown in the figure.

[0026] REFERENCE NUMERALS:

[0027] 1. Primary side pipeline;

[0028] 2. Secondary side pipeline; 201, secondary side main pipeline; 201a, liquid supply pipeline; 201b, liquid return pipeline; 202, detection pipeline; 203, liquid supplement pipeline; 204, bypass pipeline; 205, shock absorption pipeline;

[0029] 3. Heat exchanger;

[0030] 4. Water quality detection device; 41, conductivity meter; 42, PH meter; 43, turbidity meter; 44, coupon detection tank;

[0031] 5. Ball valve;

[0032] 6. Flow meter;

[0033] 7. Drain valve;

[0034] 8. Circulating pump;

[0035] 9. Electric two-way valve;

[0036] 10. Reverse osmosis device;

[0037] 11. First butterfly valve;

[0038] 12, secondary side filter;

[0039] 13, second butterfly valve;

[0040] 14, third butterfly valve;

[0041] 15, fourth butterfly valve;

[0042] 16, pressure sensor;

[0043] 17, degassing tank;

[0044] 18, expansion tank;

[0045] 19, manual exhaust valve;

[0046] 20, automatic exhaust valve;

[0047] 21, liquid supplement tank;

[0048] 22, safety valve;

[0049] 23, check valve;

[0050] 24, temperature sensor;

[0051] 25, primary side filter;

[0052] 100, cooling device;

[0053] 200, device to be cooled. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0055] In the description of the present application, unless otherwise explicitly specified and limited, the terms "first", "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" means two or more, and the term "multiple" means two or more; the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, or detachable connection, or integral connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] In the description of the specification, it needs to be understood that the "upper", "lower" and other orientation words described in the embodiments of the application are described in the angle shown in the drawings, and should not be understood as the limitation of the embodiments of the application. In addition, in the context, it also needs to be understood that when referring to one element connected to another element "on" or "under", it can not only be directly connected to another element "on" or "under", but also indirectly connected to another element "on" or "under" through an intermediate element.

[0057] Referring to Figures 1-3 as shown, Figure 1 a structure schematic diagram of the CDU system provided by the embodiments of the application, Figure 2 a structure schematic diagram of the secondary side pipeline of the CDU system provided by the embodiments of the application, Figure 3 a structure schematic diagram of the primary side pipeline of the CDU system provided by the embodiments of the application. The embodiments disclose a CDU system, which comprises a primary side pipeline 1, a secondary side pipeline 2 and a heat exchanger 3. The primary side pipeline 1 is used to be connected with a cooling device 100. The cooling device 100 is used to cool the cooling medium in the primary side pipeline 1. The cooling device 100 can be a cooling tower or a dry cooler and the like. The secondary side pipeline 2 comprises a secondary side main pipeline 201 and a detection pipeline 202. The secondary side main pipeline 201 is used to be connected with a to-be-cooled device 200. The cooling medium in the secondary side pipeline 2 is used to cool the to-be-cooled device 200. The to-be-cooled device 200 can be a server terminal cold plate or other structure needing heat dissipation. The two ends of the detection pipeline 202 are respectively connected to different points of the secondary side main pipeline 201. The heat exchanger 3 is connected with the primary side pipeline 1 and the secondary side main pipeline 201 respectively. The cooling medium in the primary side pipeline 1 and the cooling medium in the secondary side main pipeline 201 exchange heat through the heat exchanger 3. A water quality detection device 4 is arranged on the detection pipeline 202. The water quality detection device 4 is used to detect the quality of the cooling medium in the secondary side main pipeline 201. The two ends of the water quality detection device 4 are respectively provided with ball valves 5. When it is needed to disassemble and maintain the water quality detection device 4, the ball valves 5 at the two ends of the detection device are closed. The CDU system does not need to stop working. The online maintenance of the water quality detection device 4 is realized.

[0058] In the embodiments, the primary side pipeline 1 and the secondary side pipeline 2 are respectively provided with flow meters 6. The flow of the fluid is monitored in real time. Once the flow exceeds the safe range, measures can be taken in time to reduce the occurrence of accidents.

[0059] In the embodiments, the primary side pipeline 1 and the secondary side pipeline 2 are respectively provided with a plurality of drainage valves 7. The drainage valves 7 are used to control the discharge of the liquid when stopping and to discharge the excess cooling medium when working normally. The drainage valves 7 are located at the lowest part of the system to facilitate the discharge of the cooling medium.

[0060] The two ends of the detection pipeline 202 are connected to different points of the secondary side main pipeline 201 respectively, so that the cooling medium in the secondary side pipeline 2 can be branched to the secondary side main pipeline 201 and the detection pipeline 202, and the water quality detection device 4 is arranged on the detection pipeline 202, the water quality detection device 4 is used for detecting the quality of the cooling medium in the secondary side main pipeline 201, and continuous and real-time water quality data is provided through the water quality detection device 4, so as to realize online quality detection of the cooling medium in the secondary side main pipeline 201, ensure the heat dissipation efficiency of the CDU system and the stability and safety of the system, and ensure the normal work of the equipment to be cooled 200.

[0061] Referring to Figure 2 The secondary side main pipeline 201 is provided with a circulating pump 8, and the secondary side main pipeline 201 includes a liquid supply pipeline 201a and a liquid return pipeline 201b, the circulating pump 8 is arranged on the liquid return pipeline 201b, and the circulating pump 8 is used to drive the cooling medium in the secondary side main pipeline 201 to flow to the equipment to be cooled 200 through the liquid supply pipeline 201a, and then flow to the heat exchanger 3 from the liquid return pipeline 201b. The detection pipeline 202 communicates with the liquid supply pipeline 201a and the liquid return pipeline 201b respectively, so as to realize comprehensive monitoring of the secondary side main pipeline 201, thereby ensuring the reliability of the CDU system.

[0062] In the embodiment, the detection pipeline 202 communicates with the liquid supply pipeline 201a and the liquid return pipeline 201b respectively, and it can be understood that in other embodiments, the two ends of the detection pipeline 202 can also be connected to the liquid supply pipeline 201a at the same time, or connected to the liquid return pipeline 201b at the same time.

[0063] In the embodiment, the circulating pump 8 is connected to the liquid return pipeline 201b through the shock absorption pipe 205, and the shock absorption pipe 205 is used to absorb the vibration generated when the circulating pump 8 operates, so as to protect the system pipeline, thereby improving the safety of the CDU system.

[0064] Referring to Figure 2 The water quality detection device 4 includes a conductivity meter 41, a pH meter 42, a turbidimeter 43 and a coupon detection tank 44 arranged on the detection pipeline 202 respectively, the conductivity meter 41 is used for monitoring and controlling the ion concentration in the cooling medium. The pH meter 42 is used for measuring the acidity and alkalinity of the cooling medium, that is, the pH value. The turbidimeter 43 is used for measuring the turbidity of the cooling medium. The coupon detection is used for testing the corrosion of the pipeline.

[0065] The secondary side pipeline 2 further comprises a bypass pipeline 204 in communication with the liquid supply pipeline 201a and the liquid return pipeline 201b respectively, and the bypass pipeline 204 is provided with an electric two-way valve 9 and a reverse osmosis device 10. The electric two-way valve 9 is used to control the flow of the cooling medium in the bypass pipeline 204, so as to realize shunt pressure reduction of the secondary side main pipeline 201 by opening and closing of the electric two-way valve 9. The reverse osmosis device 10 is used to filter impurities in the bypass pipeline 204, so as to purify the cooling medium. The safety and stability of the secondary side main pipeline 201 are ensured by the electric two-way valve 9 and the reverse osmosis device 10. The CDU system further comprises a controller connected with the water quality detection device 4 and the electric two-way valve 9 respectively, and used to control the opening degree of the electric two-way valve 9 and the opening and closing of the reverse osmosis device 10 based on the detection result of the water quality detection device 4, so as to realize automation of online monitoring of water quality of the CDU system. The reverse osmosis device 10 can also be an ion exchanger, which is used to reduce the size of the system conductivity. When the conductivity meter 41 detects that the conductivity of the cooling medium is too high, the data is transmitted to the controller, the controller controls the electric two-way valve 9 to open and adjusts the flow, at this time, the cooling medium flows into the ion exchanger, and the ion exchanger adsorbs the ions in the cooling medium, so that the conductivity of the cooling medium reaches the normal value.

[0066] In the embodiment, two first butterfly valves 11 are further provided on the bypass pipeline 204, and the electric two-way valve 9 and the reverse osmosis device 10 are respectively located between the two first butterfly valves 11. When it is necessary to disassemble and maintain the electric two-way valve 9 and the reverse osmosis device 10, the two first butterfly valves 11 can be closed, without stopping the work of the CDU system, so as to realize online maintenance of the electric two-way valve 9 and the reverse osmosis device 10.

[0067] Referring to Figure 2 As shown in the figure, the liquid supply pipeline 201a is further provided with a secondary side filter 12, a second butterfly valve 13, a third butterfly valve 14 and a fourth butterfly valve 15. The secondary side filter 12 is used to filter the cooling medium entering the equipment to be cooled 200, so as to reduce the blocking of the cold plate of the equipment to be cooled 200 and ensure the normal work of the equipment to be cooled 200. The second butterfly valve 13 is located at the input end of the secondary side filter 12, and the third butterfly valve 14 is located at the output end of the secondary side filter 12. The fourth butterfly valve 15 is provided in parallel with the secondary side filter 12, the second butterfly valve 13 and the third butterfly valve 14. When it is necessary to disassemble and maintain the secondary side filter 12, the second butterfly valve 13 and the third butterfly valve 14 are closed, and the fourth butterfly valve 15 is opened, so that the cooling medium flows out through the fourth butterfly valve 15, so as to ensure the normal operation of the system during online maintenance of the system.

[0068] In the embodiment, the second butterfly valve 13 and the third butterfly valve 14 are further provided with an exhaust valve and a drain valve 7 to reduce the pressure in the secondary side filter 12 connecting pipeline when the secondary side filter 12 is disassembled, facilitating disassembly.

[0069] In the embodiment, the input end of the secondary side filter 12 is provided with a pressure sensor 16 to monitor and control the operation state of the secondary side filter 12, ensuring its normal and efficient operation.

[0070] Referring to Figure 2 As shown, the input end of the circulating pump 8 is provided with a pressure sensor 16 connected through a ball valve 5, a degassing tank 17, an expansion tank 18 connected through a ball valve 5, a manual exhaust valve 19 and an automatic exhaust valve 20 connected through a ball valve 5, and the output end of the circulating pump 8 is provided with a pressure sensor 16 for detecting the water pressure at the input end and the output end of the circulating pump 8 to reduce system failure or safety hazards caused by excessive or insufficient pressure, thereby ensuring the safety of the CDU system. The degassing tank 17 is used to remove gas in the cooling medium. The expansion tank 18 is used to stabilize the pipeline pressure by absorbing the pressure change of the fluid, ensuring the safe and stable operation of the pipeline system. The manual exhaust valve 19 and the automatic exhaust valve 20 are respectively connected to the degassing tank 17, and the manual exhaust valve 19 and the automatic exhaust valve 20 are located at the highest point of the system. At the initial stage of system operation, the manual exhaust valve 19 is opened to discharge a large amount of gas and improve the exhaust efficiency, and during system operation, the manual exhaust valve 19 is closed and the automatic exhaust valve 20 is opened to discharge gas in the system pipeline in real time. Among them, each component is connected to the pipeline through a ball valve 5 to facilitate disassembly of each component and facilitate adjustment and control of the flow of the medium, further ensuring the safe operation of the system.

[0071] The secondary side pipeline 2 further comprises a liquid supplementing pipeline 203, one end of the liquid supplementing pipeline 203 is connected to the secondary side main pipeline 201 and located at the input end of the circulating pump 8, the other end of the liquid supplementing pipeline 203 is connected to a liquid supplementing tank 21, and the liquid supplementing pipeline 203 is provided with a filter and a liquid supplementing pump, the filter is used to filter the liquid flowing out of the liquid supplementing tank 21. The liquid supplementing pump is used to drive the liquid in the liquid supplementing tank 21 to flow from the liquid supplementing pipeline 203 into the secondary side main pipeline 201. The liquid supplementing tank 21 is provided with a liquid level sensor to monitor the liquid level of the liquid supplementing tank 21 in real time, and alarm when the liquid level is too low to timely inform the on-site maintenance personnel to supplement the liquid in the liquid supplementing tank 21.

[0072] In the embodiment, the input end of the circulating pump 8 and the input end of the device to be cooled 200 are respectively provided with safety valves 22, the liquid supplement tank 21 is connected with the safety valves 22, the safety valves 22 are used to automatically open when the pressure in the pressure container or pipeline exceeds the specified safety value, to rapidly discharge part of the medium, so as to reduce the system pressure, and the fluid discharged by the safety valves 22 is recovered through the liquid supplement tank 21, when the system pressure drops to a certain level, the liquid in the liquid supplement tank 21 can be pressed into the system through the safety valves 22, so as to supplement the pressure loss of the system, and the stability of the system is ensured.

[0073] In the embodiment, the liquid supply pipeline 201a is also provided with a manual exhaust valve 19 and an automatic exhaust valve 20, which are respectively located at the output end of the heat exchanger 3, so as to prevent air blockage and ensure normal operation of the system.

[0074] In the embodiment, the liquid supplement pipeline 203 and the input end of the device to be cooled 200 are provided with one-way valves 23, which are used to reduce the case that the liquid generates back force to the pipeline and the pump when the pump is stopped.

[0075] The embodiment ensures that the system pressure is constant through constant-pressure water supplement, reduces the case that the circulating pump 8 impeller is damaged due to cavitation caused by too low inlet pressure of the circulating pump 8, prolongs the service life of the circulating pump 8, and the pressure of the constant-pressure water supplement can be set, generally according to the static pressure of the pipeline system, and is lowered by 0.1-0.3 bar, and the pressure is higher than the cavitation allowance of the circulating pump 8.

[0076] Referring to Figure 2 As shown, the input end and the output end of the device to be cooled 200 are respectively provided with pressure sensors 16 and temperature sensors 24, so as to detect the pressure and temperature of the liquid supply and liquid return, and ensure that the device to be cooled 200 normally works.

[0077] Referring to Figure 3 Figure 3 As shown, the flow direction of the cooling medium in the primary side pipeline 1 is counterclockwise. The primary side pipeline 1 is provided with an electric two-way valve 9, the adjustment mode of which is based on the liquid supply temperature of the secondary side pipeline 2 to the device to be cooled 200, demand calculation is performed on the detection value, proportional adjustment is performed on the electric two-way valve 9, so that the liquid supply temperature of the secondary side pipeline 2 can reach the required temperature.

[0078] The primary side pipeline 1 is further provided with a primary side filter 25, a second butterfly valve 13, a third butterfly valve 14 and a fourth butterfly valve 15. The primary side filter 25 is used to filter the cooling medium in the primary side pipeline 1 to ensure normal operation of the system. The second butterfly valve 13 is located at the input end of the primary side filter 25, and the third butterfly valve 14 is located at the output end of the primary side filter 25. The fourth butterfly valve 15 is provided in parallel with the primary side filter 25, the second butterfly valve 13 and the third butterfly valve 14. When the primary side filter 25 needs to be disassembled and maintained, the second butterfly valve 13 and the third butterfly valve 14 are closed, and the fourth butterfly valve 15 is opened, so that the cooling medium flows out through the fourth butterfly valve 15, to ensure normal operation of the system during online maintenance of the system.

[0079] In the embodiment, a pressure sensor 16 is arranged at the output end of the primary side filter 25 to monitor the pressure of the filtered fluid in real time, to ensure normal operation of the system.

[0080] In the embodiment, a pressure sensor 16 and a temperature sensor 24 are arranged at the input end and the output end of the cooling device 100 respectively, to detect the pressure and temperature of the primary side pipeline 1, to ensure normal operation of the system.

[0081] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any changes or replacements that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A CDU system, characterized in that, include: A primary side pipeline, which is used to connect to the cooling equipment; The secondary side pipeline includes a secondary side main pipeline and a detection pipeline. The secondary side main pipeline is used to connect to the equipment to be cooled, and the two ends of the detection pipeline are respectively connected to different points of the secondary side main pipeline. A heat exchanger is connected to the primary side pipeline and the secondary side pipeline respectively, and the cooling medium in the primary side pipeline and the cooling medium in the secondary side pipeline exchange heat through the heat exchanger. The detection pipeline is equipped with a water quality detection device, which is used to detect the quality of the cooling medium in the secondary side main pipeline.

2. The CDU system according to claim 1, characterized in that, A circulation pump is installed on the secondary side main pipeline, and the secondary side main pipeline includes a liquid supply pipeline and a liquid return pipeline. The circulation pump is used to drive the cooling medium in the secondary side main pipeline to flow through the liquid supply pipeline to the heat dissipation equipment, and then flow through the liquid return pipeline to the heat exchanger. The detection pipeline is connected to the liquid supply pipeline and the liquid return pipeline respectively.

3. The CDU system according to claim 2, characterized in that, The secondary side pipeline also includes a bypass pipeline connected to the liquid supply pipeline and the liquid return pipeline respectively. The bypass pipeline is equipped with an electric two-way valve and a reverse osmosis device. The electric two-way valve is used to control the flow rate of the cooling medium in the bypass pipeline, and the reverse osmosis device is used to filter impurities in the bypass pipeline.

4. The CDU system according to claim 3, characterized in that, The bypass pipeline is also equipped with two first butterfly valves, and the electric two-way valve and the reverse osmosis unit are respectively located between the two first butterfly valves.

5. The CDU system according to claim 3, characterized in that, The CDU system also includes a controller, which is connected to the water quality testing device and the electric two-way valve respectively, and is used to control the opening degree of the electric two-way valve based on the detection results of the water quality testing device.

6. The CDU system according to claim 2, characterized in that, The secondary side pipeline also includes a replenishment pipeline. One end of the replenishment pipeline is connected to the secondary side main pipeline and located at the input end of the circulation pump. The other end of the replenishment pipeline is connected to the replenishment tank, and a replenishment pump is provided on the replenishment pipeline. The replenishment pump is used to drive the liquid in the replenishment tank to flow from the replenishment pipeline into the secondary side main pipeline.

7. The CDU system according to claim 6, characterized in that, Safety valves are provided at the input end of the circulating pump and the input end of the device to be cooled, and the replenishment tank is connected to the safety valves.

8. The CDU system according to claim 2, characterized in that, The secondary side main pipeline is also equipped with a manual air vent valve and an automatic air vent valve, which are located at the input end of the circulation pump, respectively.

9. The CDU system according to any one of claims 1 to 8, characterized in that, The secondary side main pipeline is also equipped with a secondary side filter, a second butterfly valve, a third butterfly valve and a fourth butterfly valve. The second butterfly valve is located at the input end of the secondary side filter, the third butterfly valve is located at the output end of the secondary side filter, and the fourth butterfly valve is connected in parallel with the secondary side filter, the second butterfly valve and the third butterfly valve.

10. The CDU system according to claim 9, characterized in that, An exhaust valve and a drain valve are provided between the second butterfly valve and the third butterfly valve.

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