Liquid cooling CDU with online dilution function

Abstract

The utility model discloses a liquid cooling CDU with an on-line dilution function, which relates to the technical field of liquid cooling heat dissipation and comprises a controller, a primary side liquid cooling pipeline 1, a secondary side liquid cooling pipeline 2 and a heat exchanger 3, a circulating pump 21 is arranged on the secondary side liquid cooling pipeline 2, and the secondary side liquid cooling pipeline 2 is connected with a clean cooling liquid unit 4, a dirty cooling liquid discharge unit 5 and a working medium detection unit 6 through pipelines; the pipelines between the secondary side liquid cooling pipeline 2 and the clean cooling liquid unit 4, between the secondary side liquid cooling pipeline 2 and the dirty cooling liquid discharge unit 5 and between the secondary side liquid cooling pipeline 2 and the working medium detection unit 6 are provided with electrically operated valves controlled by a controller, and the electrically operated valves are the first electrically operated valve, the second electrically operated valve and the third electrically operated valve respectively. According to the liquid cooling CDU, on the premise that the heat dissipation function is not interrupted, cooling liquid quality adjustment can be automatically completed, cooling liquid dilution, discharging and detection functions are integrated in a CDU pipeline system, and the reliability and operation and maintenance efficiency of the system are remarkably improved.

Description

A liquid-cooled CDU with online dilution function Technical Field

[0001] This utility model relates to the field of liquid cooling technology, specifically a liquid-cooled CDU with online dilution function for use in data center liquid cooling systems. Background Technology

[0002] Liquid-cooled CDUs, as core equipment for heat dissipation in data center servers, transfer heat between their primary and secondary sides via heat exchangers. During long-term operation or initial commissioning, the secondary coolant may experience quality degradation (such as abnormal pH, increased conductivity, or excessive turbidity) due to pipe contamination or medium deterioration, affecting heat dissipation efficiency and even corroding the pipes. Traditional coolant maintenance methods have the following significant drawbacks:

[0003] 1) Downtime risks and fluid loss associated with traditional discharge-based cleaning. Current technology often involves directly discharging contaminated coolant through a drain valve on the CDU and refilling with clean coolant. This method requires interrupting the secondary circulation, causing the server's cooling function to stop, posing a risk of downtime due to cooling interruption. Furthermore, full discharge results in significant coolant waste, especially for large data center liquid cooling systems, where a single coolant replacement can cost tens of thousands of yuan, and the replenishment process requires venting and readjustment, taking several hours.

[0004] 2) Space and cost issues associated with external purification equipment. Another solution is to integrate a separate coolant purification device (such as a filter or ion exchanger) into the liquid cooling pipeline to purify the medium through circulation filtration. However, such equipment requires additional space in a computer room or outdoors, increasing initial infrastructure costs and the complexity of subsequent maintenance. Furthermore, the filter elements need to be replaced regularly, further increasing operation and maintenance costs.

[0005] 3) The lag and insufficient precision of manual intervention. Traditional maintenance relies on manual periodic checks of coolant parameters. Upon detecting anomalies, the drain and replenishment valves are manually opened, but the adjustment process lacks real-time feedback. Manual operation is prone to over-adjustment, such as insufficient or excessive dilution, and cannot handle sudden contamination events, such as rapid contamination caused by pipeline leaks, posing significant operational risks. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, this utility model provides a liquid-cooled CDU and a data center liquid-cooled pump with online dilution function, which can achieve online maintenance without stopping the system, integrated intelligent adjustment and lightweight system architecture.

[0007] The above-mentioned objective of this utility model is achieved through the following technical means:

[0008] A liquid-cooled CDU with online dilution function, including a controller,

[0009] It also includes the primary side liquid cooling pipeline 1, the secondary side liquid cooling pipeline 2, and the heat exchanger 3, which participate in heat exchange;

[0010] The secondary side liquid cooling pipeline 2 is equipped with a circulation pump 21, and is also connected to a clean coolant unit 4, a dirty coolant discharge unit 5, and a working fluid detection unit 6.

[0011] The secondary side liquid cooling pipeline 2 is equipped with electric valves controlled by the controller in the pipelines between it and the clean coolant unit 4, the dirty coolant discharge unit 5, and the working fluid detection unit 6. These are the first electric valve, the second electric valve, and the third electric valve.

[0012] Optionally, the working fluid detection unit 6 includes at least one of the following: a pH detector, an EC detector, and a TU detector connected to the controller;

[0013] The other end of the working fluid detection unit 6 is connected to a discharge pipeline.

[0014] Furthermore, the clean coolant unit 4 is externally connected to a clean coolant source.

[0015] Furthermore, the turbid coolant discharge unit 5 is externally connected to a discharge pipeline.

[0016] Optionally, the heat exchanger 3 includes at least one of the following: shell and tube heat exchanger, spiral plate heat exchanger, and plate-fin heat exchanger.

[0017] Optionally, the discharge pipe of the working fluid detection unit 6 is connected to a collection vessel.

[0018] Optionally, the discharge pipeline of the working fluid detection unit 6 is connected to the secondary side liquid cooling pipeline 2.

[0019] Furthermore, the secondary side liquid cooling pipeline 2 between the clean coolant unit 4 and the dirty coolant discharge unit 5 is also connected to the liquid replenishment unit 7; the pipeline between the secondary side liquid cooling pipeline 2 and the liquid replenishment unit 7 is equipped with a fourth electric valve controlled by the controller and a diaphragm pump 22.

[0020] The secondary side liquid cooling pipeline 2 is also equipped with a hydraulic sensor connected to the controller.

[0021] Preferably, the replenishment unit 7 has a coolant tank, which is equipped with a replenishment port and a level detector.

[0022] Furthermore,

[0023] The secondary side liquid cooling pipeline 2 between the clean coolant unit 4 and the replenishment unit 7 is equipped with a fifth electric valve controlled by the controller;

[0024] The secondary side liquid cooling pipeline 2 between the turbid coolant discharge unit 5 and the liquid replenishment unit 7 is equipped with a sixth electric valve controlled by the controller.

[0025] The beneficial effects of adopting the above technical solution are as follows:

[0026] 1) In this utility model, the liquid-cooled CDU can automatically complete the coolant quality adjustment without interrupting the heat dissipation function. The coolant dilution, discharge and detection functions are integrated into the CDU piping system, which significantly improves the system reliability and operation and maintenance efficiency.

[0027] 2) Through real-time monitoring and feedback by hydraulic sensors, abnormal hydraulic conditions in the secondary liquid cooling pipeline can be detected and corrected in a timely manner, avoiding pipeline damage and leakage caused by excessively high or low hydraulic pressure, and preventing the circulating pump from running dry due to insufficient liquid in the secondary pipeline; combined with hydraulic information and other detection parameters, the controller can more accurately control the replenishment flow rate and timing of the replenishment unit, avoiding over-replenishment or under-replenishment, improving the dilution effect and quality of the coolant; and ensuring the safety and reliability of the system.

[0028] 3) Through refined valve control, the liquid cooling system achieves full-process intelligent operation from status monitoring to response. While improving heat dissipation stability, it also takes into account safety, economy and operating condition adaptability, providing technical support for reliable operation in scenarios such as high-density data centers. Attached Figure Description

[0029] Figure 1 is a schematic diagram of a liquid-cooled CDU with online dilution function.

[0030] The system includes: a primary liquid cooling pipeline 1; a secondary liquid cooling pipeline 2; a circulating pump 21; a diaphragm pump 22; a hydraulic sensor 23; a heat exchanger 3; a clean coolant unit 4; a contaminated coolant discharge unit 5; a working fluid detection unit 6; a replenishment unit 7; a first electric valve V1; a second electric valve V2; a third electric valve V3; a fourth electric valve V4; a fifth electric valve V5; and a sixth electric valve V6. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Example 1. This example illustrates a liquid-cooled CDU with online dilution function, as shown in Figure 1, including a controller.

[0033] It also includes the primary side liquid cooling pipeline 1, the secondary side liquid cooling pipeline 2, and the heat exchanger 3, which participate in heat exchange;

[0034] The secondary side liquid cooling pipeline 2 is equipped with a circulation pump 21, and is also connected to a clean coolant unit 4, a dirty coolant discharge unit 5, and a working fluid detection unit 6.

[0035] The secondary side liquid cooling pipeline 2 is equipped with electric valves controlled by the controller in the pipelines between it and the clean coolant unit 4, the dirty coolant discharge unit 5, and the working fluid detection unit 6. These are the first electric valve, the second electric valve, and the third electric valve.

[0036] In this embodiment, a primary-side liquid cooling pipeline 1 and a secondary-side liquid cooling pipeline 2 are provided, and heat exchange between the two is achieved through a heat exchanger 3. A circulation pump 21 is connected in series on the secondary-side liquid cooling pipeline 2 to drive the coolant to circulate in the secondary-side liquid cooling pipeline 2. The secondary-side pipeline is respectively connected to a clean coolant unit 4, a contaminated coolant discharge unit 5, and a working fluid detection unit 6, and each connected pipeline is equipped with an electric valve. The pipeline between the clean coolant unit 4 and the secondary-side pipeline 2 is equipped with a first electric valve, which is controlled by a controller; the pipeline between the contaminated coolant discharge unit 5 and the secondary-side pipeline 2 is equipped with a second electric valve, which is controlled by the controller; and the pipeline between the working fluid detection unit 6 and the secondary-side pipeline 2 is equipped with a third electric valve, which is opened or closed by the controller.

[0037] Example of online coolant dilution:

[0038] I. Initial State and Monitoring Trigger

[0039] 1. System in normal operation: The coolant in the secondary side liquid cooling pipeline 2 is continuously circulated under the drive of the circulating pump 21, and exchanges heat with the primary side pipeline 1 through the heat exchanger 3. The working fluid detection unit 6 is connected to the secondary side pipeline 2 through the third electric valve. The controller periodically opens the third electric valve to draw a small amount of coolant to the working fluid detection unit 6, and monitors parameters such as pH value, EC (conductivity), and TU (turbidity) in real time.

[0040] 2. Non-compliance signal trigger: When the detection parameter exceeds the preset threshold (such as abnormal pH value, excessive conductivity or excessive turbidity), the working fluid detection unit 6 transmits the signal to the controller to trigger the automatic adjustment program.

[0041] II. The discharge of turbid liquid and the dilution of clean liquid are started simultaneously.

[0042] 1. Activation of the discharge and replenishment pathway: The controller commands the second electric valve to open, connecting the contaminated coolant discharge unit 5, and discharging part of the contaminated coolant from the secondary side pipeline 2; simultaneously, the first electric valve opens, connecting the clean coolant unit 4, and replenishing the secondary side pipeline with external clean coolant. During this process, the circulation pump 21 continues to run, ensuring that the fluid in the pipeline remains in a flowing state and promoting uniform mixing of the old and new coolants.

[0043] 2. Dynamic Flow Matching: The flow rates for discharge and replenishment need to be coordinated by the controller to avoid excessive fluctuations in pipeline pressure. For example, if the detected parameters are severely out of control, the controller can increase the opening of the second electric valve to accelerate discharge, while simultaneously increasing the opening of the first electric valve to replenish the clean liquid. If the parameters are close to the critical value, the flow rates of both can be reduced, and a slow adjustment with a small flow rate can be used.

[0044] III. Real-time Feedback and Closed-Loop Regulation

[0045] 1. Continuous monitoring and parameter calibration: The working fluid detection unit 6 maintains real-time monitoring and continuously feeds back the parameters of the mixed coolant to the controller. The controller dynamically adjusts the opening of the electric valve based on the real-time data. For example, if the parameter improvement trend is obvious, the current discharge / replenishment flow rate is maintained; if the parameter improvement is slow, the clean liquid replenishment amount is increased or the discharge time is extended; if the parameter fluctuates (such as excessive dilution), the second electric valve is closed to suspend discharge, and the replenishment amount is finely adjusted only through the first electric valve.

[0046] 2. Compliance Judgment and Process Termination: When the test parameters fall within the qualified range for N consecutive times, the controller determines that the working fluid meets the standard and performs the following operations: close the second electric valve to stop the discharge of turbid liquid; close the first electric valve to stop the replenishment of clean liquid; resume normal operation and periodically perform working fluid testing.

[0047] IV. Flowchart

[0048] The circulating pump maintains flow → the working fluid fails to meet the standard → the controller triggers discharge and replenishment → real-time parameter monitoring → dynamic adjustment of valve opening → parameters meet the standard → return to normal.

[0049] This utility model allows the liquid-cooled CDU to automatically adjust the coolant quality without interrupting its heat dissipation function. Coolant dilution, drainage, and detection functions are integrated into the CDU piping system, significantly improving system reliability and operational efficiency. Specifically:

[0050] Non-stop online maintenance: While maintaining the secondary side circulation, the dirty liquid is discharged and the clean liquid is replenished simultaneously to ensure continuous heat dissipation of the server;

[0051] Integrated intelligent regulation: Through the closed-loop control of the working fluid detection unit and electric valve, the coolant parameters can be monitored and dynamically adjusted in real time, avoiding the lag of manual intervention;

[0052] Lightweight system architecture: Clean liquid replenishment, turbid liquid discharge and detection functions are integrated into the CDU piping system, eliminating the need for additional purification equipment and reducing space occupation and cost.

[0053] Example 2. This example shows a working fluid detection unit, as shown in Figure 1. The working fluid detection unit 6 includes at least one of the following: a pH detector, an EC detector, and a TU detector connected to the controller.

[0054] The other end of the working fluid detection unit 6 is connected to a discharge pipeline.

[0055] Example of detection process for a single pH detector

[0056] 1) Detection scenario: After the liquid-cooled CDU has been running for a period of time, the secondary side coolant may accumulate acidic substances due to the absorption of CO2 from the air, and the pH value may be suspected to deviate from the neutral range (such as the preset threshold of 6.5 to 8.5).

[0057] 2) Detection execution, controller instruction: periodically open the third electric valve to draw coolant to the pH detector of the working fluid detection unit 6.

[0058] 3) Detection action: The pH detector measures the sample in real time and outputs a voltage signal to the controller (e.g., pH = 5.8, below the lower threshold).

[0059] 4) System Response

[0060] Alarm Trigger: The controller determines that the pH value is not up to standard, illuminates the alarm light on the operation panel, and sends a warning message to the maintenance terminal.

[0061] Adjustment start-up: Open the second electric valve to discharge the turbid liquid and the first electric valve to replenish the clean liquid, and run the circulation pump 21 synchronously (Example 1);

[0062] 5) Intelligent adjustment: The system repeats the detection every 10 minutes. When the pH value stabilizes in the range of 7.0 to 7.5 for three consecutive times, the controller closes the electric valve and resumes normal operation.

[0063] Example of combined detection using EC detector and TU detector

[0064] 1) Detection scenario: During the initial commissioning of the liquid cooling system, residual metal debris and ionic impurities in the secondary side pipeline may cause the conductivity (EC) and turbidity (TU) to exceed the standard (e.g., preset EC threshold ≤10μS / cm, TU threshold ≤5NTU).

[0065] 2) Detection execution, synchronous detection: The controller simultaneously activates the EC detector and the TU detector, and extracts a 1000mL coolant sample. Detection results: EC = 25μS / cm (150% exceeding the standard), TU = 12NTU (140% exceeding the standard), and the data is synchronously transmitted to the controller.

[0066] 3) System Response

[0067] High-priority adjustment: The controller determines that the two parameters are seriously out of control and triggers the "rapid purification mode": the opening of the second electric valve is adjusted to 100% and the discharge flow rate is increased to 15L / min;

[0068] The opening of the first electric valve is set to 100%, and the clean liquid replenishment flow rate is simultaneously set to 15L / min.

[0069] The speed of the circulation pump 21 is increased to 120% of its rated speed, enhancing fluid turbulence to accelerate mixing.

[0070] 4) Dynamic calibration

[0071] The system measures every 5 minutes. When EC drops to 12 μS / cm and TU drops to 8 NTU, the controller switches to "slow adjustment mode" (flow rate halved).

[0072] When EC = 8 μS / cm and TU = 3 NTU, the standard is met, and discharge and replenishment are stopped.

[0073] Example of multi-detector collaborative detection and waste liquid reflux

[0074] 1) Testing scenario: After long-term operation of the liquid-cooled CDU, the pH value of the coolant decreases (e.g., 6.2) and the turbidity increases (7 NTU) due to the proliferation of microorganisms, but the conductivity remains normal (8 μS / cm).

[0075] 2) Detection and Execution, Multi-Parameter Fusion: The pH detector and TU detector work simultaneously, and the controller analyzes the pollution type through an algorithm (determining it to be organic pollution). Differential Adjustment: Open the second electric valve to discharge 10% of the pipeline volume of turbid liquid; open the first electric valve to replenish an equal amount of clean liquid.

[0076] Example 3. This example shows a clean coolant unit 4, as shown in Figure 1. The clean coolant unit 4 is externally connected to a clean coolant source. The clean coolant source in this example can be a coolant storage tank or an external coolant source connected via pipeline.

[0077] Example 4. This example illustrates a contaminated coolant discharge unit, as shown in Figure 1. The contaminated coolant discharge unit 5 is externally connected to a discharge pipeline. This discharge pipeline can be connected to a coolant recovery tank or a wastewater treatment system for centralized management, preventing environmental pollution.

[0078] Example 5. This example shows a heat exchanger, as shown in Figure 1. The heat exchanger 3 includes at least one of the following: a shell-and-tube heat exchanger, a spiral plate heat exchanger, and a plate-fin heat exchanger.

[0079] Example 6. This example illustrates a direct discharge from the working fluid detection unit, as shown in Figure 1. The discharge pipeline of the working fluid detection unit 6 is connected to a collection container. The discharge path is completely isolated from the secondary pipeline and is unaffected by the system's operating status.

[0080] Example 7. This example illustrates the recycling of the working fluid detection unit (not shown in the figure). The discharge pipeline of the working fluid detection unit 6 is connected to the secondary side liquid cooling pipeline 2.

[0081] Compared to Example 6, in this example, the tested coolant can be directly returned to the secondary side pipeline, reducing the loss of clean coolant, lowering the replenishment cost, eliminating the need for external receiving containers, simplifying the pipeline layout, saving space, and making it suitable for compact liquid-cooled CDU designs or mobile scenarios.

[0082] Example 8. This example shows a liquid replenishment unit. As shown in Figure 1, the secondary side liquid cooling pipeline 2 between the clean coolant unit 4 and the dirty coolant discharge unit 5 is also connected to the liquid replenishment unit 7; the pipeline between the secondary side liquid cooling pipeline 2 and the liquid replenishment unit 7 is equipped with a fourth electric valve controlled by a controller and a diaphragm pump 22.

[0083] The secondary side liquid cooling pipeline 2 is also equipped with a hydraulic sensor 23 connected to the controller.

[0084] Control example of Example 8:

[0085] Initial state monitoring

[0086] The hydraulic sensor in the secondary side liquid cooling line 2 monitors the hydraulic pressure of the secondary side liquid cooling line in real time, while other detectors (such as PH, EC, TU detectors, etc.) detect various parameters of the coolant according to a preset cycle.

[0087] The controller collects data from all the detectors / sensors mentioned above, performs comprehensive analysis, and determines whether the system is operating normally.

[0088] When the detection parameters such as pH, EC, and TU exceed the preset threshold, it indicates that the coolant needs to be diluted, triggering the operation of Example 1.

[0089] Infusion Trigger Condition Judgment

[0090] Hydraulic anomaly trigger: If the hydraulic sensor 23 detects that the hydraulic pressure in the secondary side liquid cooling pipeline is lower than the normal range, it indicates that there may be a problem with the amount or flow state of the coolant in the pipeline, triggering a fluid replenishment operation.

[0091] Fluid resuscitation procedure

[0092] Access opening: When the hydraulic abnormality triggering condition is met, the controller opens the fourth electric valve between the secondary side liquid cooling pipeline and the liquid replenishment unit and starts the diaphragm pump.

[0093] Flow and pressure coordinated control: The controller dynamically adjusts the pumping flow of the diaphragm pump and the opening degree of the fourth electric valve based on the hydraulic value fed back by the hydraulic sensor.

[0094] Real-time feedback and dynamic adjustment

[0095] Hydraulic sensors and other detectors continuously monitor the hydraulic and coolant parameters of the secondary liquid-cooled piping in real time and feed the data back to the controller.

[0096] Standards assessment and cessation

[0097] When the hydraulic sensor detects that the hydraulic pressure has returned to the normal range, the controller determines that the coolant hydraulic pressure is up to standard.

[0098] The controller shuts off the fourth electric valve and the diaphragm pump, stopping the replenishment. The system returns to normal operation and continues to periodically monitor various parameters.

[0099] In this embodiment, real-time monitoring and feedback via hydraulic sensors enable timely detection and correction of hydraulic anomalies in the secondary liquid-cooled piping, preventing issues such as pipe damage and leakage caused by excessively high or low hydraulic pressure, and avoiding dry running of the circulation pump due to insufficient liquid in the secondary piping. By combining hydraulic information with other detection parameters, the controller can more accurately control the replenishment flow rate and timing of the replenishment unit, avoiding over- or under-replenishment, improving the dilution effect and quality of the coolant, and ensuring the safety and reliability of the system.

[0100] Example 9. This example further illustrates a replenishment unit, as shown in Figure 1. The replenishment unit 7 has a coolant tank, which is equipped with a replenishment port and a level detector. In this example, the level detector provides real-time feedback on the coolant tank level, preventing the diaphragm pump from running dry or the system from being interrupted due to insufficient coolant. It is linked with the controller to automatically activate an external clean liquid source for replenishment when the coolant level falls below a threshold, ensuring the continuity of the dilution process. This avoids the lag of manual replenishment checks and prevents pipeline pressure fluctuations or decreased heat dissipation efficiency caused by untimely replenishment.

[0101] Example 10. This example illustrates a further refined control logic, as shown in Figure 1.

[0102] The secondary side liquid cooling pipeline 2 between the clean coolant unit 4 and the replenishment unit 7 is equipped with a fifth electric valve controlled by the controller;

[0103] The secondary side liquid cooling pipeline 2 between the turbid coolant discharge unit 5 and the liquid replenishment unit 7 is equipped with a sixth electric valve controlled by the controller.

[0104] Working fluid detection control logic: The coolant in the secondary side liquid cooling pipeline 2 is continuously circulated under the drive of the circulation pump 21. The first electric valve V1 and the second electric valve V2 are closed, and the fifth electric valve V5 and the sixth electric valve V6 are opened. The opening degree of the third electric valve V3 is controlled to allow the coolant to enter the working fluid detection unit 6 for pH value, conductivity EC and turbidity TU monitoring. The detected coolant is discharged to the collection container through the discharge pipeline or re-enters the secondary side liquid cooling pipeline 2 for recycling. If the monitoring data exceeds the preset threshold, the dilution control logic or replacement control logic is triggered.

[0105] Hydraulic detection logic: The coolant in the secondary side liquid cooling pipeline 2 is continuously circulated under the drive of the circulation pump 21. The hydraulic sensor 23 in the secondary side liquid cooling pipeline 2 monitors the hydraulic status of the secondary side liquid cooling pipeline in real time. If the hydraulic pressure is lower than the normal range, it indicates that the amount of coolant in the pipeline is insufficient, triggering the liquid replenishment control logic.

[0106] Liquid replenishment control logic: The coolant in the secondary side liquid cooling pipeline 2 is continuously circulated under the drive of the circulation pump 21. The first electric valve V1, the second electric valve V2, and the third electric valve V3 are closed, and the fourth electric valve V4, the fifth electric valve V5, the sixth electric valve V6, and the diaphragm pump 22 are opened. The coolant in the liquid replenishment unit continues to flow into the secondary side liquid cooling pipeline 2 until the hydraulic pressure returns to the normal range. Then, the working fluid detection control logic and the hydraulic pressure detection logic are switched.

[0107] Dilution control logic: The coolant in the secondary side liquid cooling pipeline 2 is continuously circulated under the drive of the circulation pump 21. The first electric valve V1, the second electric valve V2, the fifth electric valve V5, and the sixth electric valve V6 are opened, the third electric valve V3 is controlled to open and close intermittently, and the fourth electric valve V4 and the diaphragm pump 22 are closed. The clean coolant in the clean coolant unit 4 flows into the secondary side liquid cooling pipeline 2 through the first electric valve V1 under the drive of the circulation pump 21. At the same time, the turbid coolant in the pipeline is discharged from the turbid coolant discharge unit 5 through the second electric valve V2. The inflow and outflow continuously dilute the turbid coolant in the secondary side liquid cooling pipeline 2. During this process, the third electric valve V3 is controlled to open and close intermittently multiple times to monitor whether the working fluid returns to the normal range. If the coolant working fluid returns to the normal range, the logic switches to the working fluid detection control logic and the hydraulic detection logic.

[0108] Replacement control logic: The coolant in the secondary side liquid cooling pipeline 2 is continuously circulated under the drive of the circulation pump 21. The first electric valve V1 and the second electric valve V2 are opened, the fourth electric valve V4 and the diaphragm pump 22 are closed, and the fifth electric valve V5 and the sixth electric valve V6 are closed to cut off the secondary side liquid cooling pipeline between the clean coolant unit 4 and the dirty coolant discharge unit 5. The clean coolant in the clean coolant unit 4 flows into the secondary side liquid cooling pipeline 2 under the drive of the circulation pump 21 through the first electric valve V1. At the same time, the dirty coolant in the pipeline is discharged from the dirty coolant discharge unit 5 through the second electric valve V2. The dirty coolant is quickly replaced by clean coolant. According to the complete replacement time of the test data, when the complete replacement time is reached, the third electric valve V3 is controlled to open and close multiple times to monitor whether the working fluid returns to the normal range. If the coolant working fluid returns to the normal range, the control logic switches to the working fluid detection control logic and the hydraulic detection logic.

[0109] Example 10 refines the control logic by adding a fifth and a sixth electric valve, significantly improving the intelligent control level and operational adaptability of the liquid-cooled CDU system. The specific effects are as follows:

[0110] 1) Multi-mode precise control, covering all scenarios of operation and maintenance needs.

[0111] Layered detection mechanism: Working fluid detection and hydraulic detection are triggered independently, and are respectively adjusted by the opening degree of the third electric valve and fed back in real time by the hydraulic sensor, so as to achieve accurate monitoring of PH / EC / TU parameters and pipeline pressure, and avoid misjudgment caused by interference from multiple parameters.

[0112] Operating condition matching control: Designed with "dilution" and "replacement" dual modes for different levels of contamination. When the contamination is light, the dilution mode of replenishing and draining is adopted (V1, V2, V5, V6 are turned on) and dynamically adjusted through intermittent detection. When the contamination is heavy, the full flow replacement mode is activated (V5 and V6 are turned off to cut off the pipeline) to ensure rapid replacement of clean liquid and improve the treatment efficiency under extreme conditions.

[0113] 2) Enhanced system safety and reliability: In the fluid replenishment control logic, by closing unnecessary valves (V1, V2, V3) and linking the diaphragm pump, directional replenishment is achieved when the hydraulic pressure is abnormal, avoiding pipeline pressure fluctuations caused by flow counteraction during the fluid replenishment process, and effectively preventing the circulating pump from running dry and the seals from being damaged.

[0114] 3) Improved operation and maintenance efficiency and economy: Each control logic automatically switches through valve combinations, completing the entire closed loop from detection triggering to mode execution and target determination without manual intervention, thus reducing operation and maintenance costs.

[0115] In summary, Example 10 achieves intelligent operation of the liquid cooling system from status monitoring to response through refined valve control. While improving heat dissipation stability, it also takes into account safety, economy and adaptability to operating conditions, providing technical support for reliable operation in scenarios such as high-density data centers.

[0116] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the scope of the present utility model application shall still fall within the scope of the present utility model.

Claims

1. A liquid-cooled CDU with online dilution function, comprising a controller, characterized in that, It also includes a primary side liquid cooling pipeline (1), a secondary side liquid cooling pipeline (2), and a heat exchanger (3) that participate in heat exchange; the secondary side liquid cooling pipeline (2) is equipped with a circulation pump (21), and is also connected to a clean coolant unit (4), a dirty coolant discharge unit (5), and a working fluid detection unit (6); the pipelines between the secondary side liquid cooling pipeline (2) and the clean coolant unit (4), the dirty coolant discharge unit (5), and the working fluid detection unit (6) are all equipped with electric valves controlled by a controller, namely the first electric valve, the second electric valve, and the third electric valve.

2. The liquid-cooled CDU with online dilution function as described in claim 1, characterized in that, The working fluid detection unit (6) includes at least one of the following: a pH detector, an EC detector, and a TU detector connected to the controller; the other end of the working fluid detection unit (6) is connected to an exhaust pipe.

3. The liquid-cooled CDU with online dilution function as described in claim 1, characterized in that, The clean coolant unit (4) is connected to an external clean coolant source.

4. The liquid-cooled CDU with online dilution function as described in claim 1, characterized in that, The turbid coolant discharge unit (5) is connected to an external discharge pipeline.

5. The liquid-cooled CDU with online dilution function as described in claim 1, characterized in that, The heat exchanger (3) includes at least one of the following: shell and tube heat exchanger, spiral plate heat exchanger, and plate-fin heat exchanger.

6. The liquid-cooled CDU with online dilution function as described in claim 2, characterized in that, The discharge pipe of the working fluid detection unit (6) is connected to a collection vessel.

7. The liquid-cooled CDU with online dilution function as described in claim 2, characterized in that, The discharge pipeline of the working fluid detection unit (6) is connected to the secondary side liquid cooling pipeline (2).

8. The liquid-cooled CDU with online dilution function as described in claim 1, characterized in that, The secondary side liquid cooling pipeline (2) between the clean coolant unit (4) and the dirty coolant discharge unit (5) is also connected to the replenishment unit (7); the pipeline between the secondary side liquid cooling pipeline (2) and the replenishment unit (7) is equipped with a fourth electric valve controlled by the controller and a diaphragm pump (22); the secondary side liquid cooling pipeline (2) is also equipped with a hydraulic sensor connected to the controller.

9. The liquid-cooled CDU with online dilution function as described in claim 8, characterized in that, The replenishment unit (7) has a coolant tank, which is equipped with a replenishment port and a level detector.

10. The liquid-cooled CDU with online dilution function as described in claim 8, characterized in that, The secondary side liquid cooling pipeline (2) between the clean coolant unit (4) and the replenishment unit (7) is equipped with a fifth electric valve (V5) controlled by the controller; the secondary side liquid cooling pipeline (2) between the dirty coolant discharge unit (5) and the replenishment unit (7) is equipped with a sixth electric valve (V6) controlled by the controller.

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