Liquid-cooled CDU with secondary-side pressure regulation

Abstract

The utility model relates to a liquid cooling CDU with secondary side pressure regulating function, comprising: a heat exchanger; a primary side pipeline system; a secondary side pipeline system, comprising a secondary side liquid supply pipe, a secondary side liquid return pipe and a water tank; a circulating pump set, comprising a first intelligent water pump, the first intelligent water pump is connected on the secondary side liquid return pipe and is located the water outlet side of water tank;Valve group, comprising a first liquid return valve and a water tank pressure relief valve;Detection assembly, comprising a temperature and pressure sensor;Control module, electric connection circulating pump set, valve group and detection assembly;The secondary side pipeline system further comprises a pressure relief bypass pipe, the pressure relief bypass pipe connects the secondary side liquid supply pipe and the water tank, and the valve group further comprises a bypass pressure relief valve, which is connected to the pressure relief bypass pipe. The utility model realizes multistage intelligent regulation of liquid cooling CDU pressure, ensures that the system automatically pressure relieves under abnormal working conditions, maintains normal operation of the system while avoiding overpressure risk.

Description

Technical Field

[0001] This utility model relates to the field of heat dissipation technology, and in particular to a liquid-cooled CDU with secondary side pressure regulation function. Background Technology

[0002] Liquid-cooled CDU (Coolant Distribution Unit) systems are crucial thermal management devices in data centers and high-power electronic equipment. Their core function is to absorb heat generated by the equipment within the cabinet using secondary-side coolant, transfer this heat to the primary-side coolant via an internal heat exchanger, and finally release it to the atmosphere from an outdoor cold source, completing the entire heat dissipation cycle. With the continuous increase in the power density of electronic equipment, precise control of system operating pressure parameters has become paramount. Current liquid-cooled CDU systems generally suffer from large secondary-side pressure fluctuations and slow adjustment response, especially under high-load conditions where pressure peaks are prone to occur. This not only affects heat exchange efficiency but may also pose safety hazards to the piping system. Traditional solutions often employ a single bypass pressure relief valve design, which struggles to achieve tiered pressure regulation and fails to meet the pressure control requirements under different operating conditions. Furthermore, the systems lack intelligent pressure regulation mechanisms, often resulting in delayed responses to sudden pressure changes. Therefore, achieving multi-level intelligent pressure regulation in liquid-cooled CDU systems to ensure stable operation under various conditions is a pressing technical challenge in this field. Utility Model Content

[0003] Therefore, this utility model provides a liquid-cooled CDU with secondary side pressure regulation function, which realizes multi-level intelligent regulation of the liquid-cooled CDU system pressure and ensures that the system automatically depressurizes under abnormal operating conditions.

[0004] To solve the above-mentioned technical problems, this utility model provides a liquid-cooled CDU with secondary side pressure regulation function, comprising:

[0005] The heat exchanger has a first medium flow channel and a second medium flow channel;

[0006] A primary side piping system includes a primary side supply pipe and a primary side return pipe, wherein the primary side supply pipe is connected to the inlet of the first medium flow channel; and the primary side return pipe is connected to the outlet of the first medium flow channel.

[0007] The secondary side piping system includes a secondary side supply pipe, a secondary side return pipe, and a water tank. The secondary side supply pipe is connected to the outlet of the second medium flow channel; the secondary side return pipe is connected to the inlet of the second medium flow channel; and the water tank is connected to the secondary side return pipe.

[0008] The circulating pump set includes a first intelligent water pump, which is connected to the secondary side return pipe and located on the outlet side of the water tank.

[0009] The valve assembly includes a first return valve and a water tank pressure relief valve. The first return valve is connected to the secondary side supply pipe and located on the outlet side of the first intelligent water pump. The water tank pressure relief valve is connected to the water tank.

[0010] The detection component includes a temperature and pressure sensor, which is connected to the secondary side supply pipe and the secondary side return pipe;

[0011] The control module is electrically connected to the circulating pump group, the valve group, and the detection component;

[0012] The secondary side piping system also includes a pressure relief bypass pipe, which is connected to the secondary side liquid supply pipe and the water tank. The valve group also includes a bypass pressure relief valve, which is connected to the pressure relief bypass pipe.

[0013] Furthermore, the heat exchanger is a plate heat exchanger.

[0014] Furthermore, the water tank is a closed expansion tank.

[0015] Furthermore, the secondary side piping system also includes a return bypass pipe, the two ends of which are connected to the inlet side and the outlet side of the first intelligent water pump. The circulating pump group also includes a second intelligent water pump, which is connected to the return bypass pipe. The valve group also includes a second return valve, which is connected to the return bypass pipe and located on the outlet side of the second intelligent water pump.

[0016] Furthermore, both the first return valve and the second return valve are one-way valves.

[0017] Furthermore, the temperature and pressure sensor on the secondary side supply pipe is located near its outlet end, and the temperature and pressure sensor on the secondary side return pipe is located near its inlet end.

[0018] Furthermore, the detection component also includes a flow meter, which is connected to the secondary side supply pipe and the primary side return pipe.

[0019] Furthermore, the secondary side piping system also includes a filter, which is connected to the secondary side return pipe and located between the water tank and the circulating pump unit.

[0020] Furthermore, it also includes an alarm system, which is electrically connected to the control module.

[0021] Compared with the prior art, the above-mentioned technical solution of this utility model has the following advantages: The liquid-cooled CDU with secondary side pressure regulation function of this utility model realizes multi-level intelligent regulation of liquid-cooled CDU pressure by setting a first intelligent water pump, bypass pressure relief valve, water tank pressure relief valve, temperature and pressure sensor and control module, ensuring that the system automatically depressurizes under abnormal working conditions, and avoiding overpressure risk while maintaining normal system operation. Attached Figure Description

[0022] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the liquid-cooled CDU in this utility model.

[0024] Explanation of reference numerals in the accompanying drawings: 1. Heat exchanger; 11. First medium flow channel; 12. Second medium flow channel; 2. Primary side piping system; 21. Primary side supply pipe; 22. Primary side return pipe; 3. Secondary side piping system; 31. Secondary side supply pipe; 32. Secondary side return pipe; 33. Water tank; 34. Pressure relief bypass pipe; 35. Return bypass pipe; 36. Filter; 41. First intelligent water pump; 42. Second intelligent water pump; 51. First return valve; 52. Water tank pressure relief valve; 53. Bypass pressure relief valve; 54. Second return valve; 61. Temperature and pressure sensor; 62. Flow meter. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0026] Example 1: See Figure 1 As shown, this utility model provides an embodiment of a liquid-cooled CDU with secondary side pressure regulation function.

[0027] The aforementioned liquid-cooled CDU with secondary side pressure regulation function includes:

[0028] Heat exchanger 1 has a first medium flow channel 11 and a second medium flow channel 12;

[0029] The primary side piping system 2 includes a primary side supply pipe 21 and a primary side return pipe 22. The primary side supply pipe 21 is connected to the inlet of the first medium flow channel 11, and the primary side return pipe 22 is connected to the outlet of the first medium flow channel 11.

[0030] The secondary side piping system 3 includes a secondary side liquid supply pipe 31, a secondary side liquid return pipe 32, and a water tank 33. The secondary side liquid supply pipe 31 is connected to the outlet of the second medium flow channel 12; the secondary side liquid return pipe 32 is connected to the inlet of the second medium flow channel 12; and the water tank 33 is connected to the secondary side liquid return pipe 32.

[0031] The circulating pump set includes a first intelligent water pump 41, which is connected to the secondary side return pipe 32 and located on the outlet side of the water tank 33.

[0032] The valve assembly includes a first return valve 51 and a water tank pressure relief valve 52. The first return valve 51 is connected to the secondary side supply pipe 31 and is located on the outlet side of the first intelligent water pump 41. The water tank pressure relief valve 52 is connected to the water tank 33.

[0033] The detection component includes a temperature and pressure sensor 61, which is connected to the secondary side supply pipe 31 and the secondary side return pipe 32.

[0034] The control module is electrically connected to the aforementioned circulating pump group, the aforementioned valve group, and the aforementioned detection components;

[0035] The secondary side piping system 3 also includes a pressure relief bypass pipe 34, which is connected to the secondary side liquid supply pipe 31 and the water tank 33. The valve group also includes a bypass pressure relief valve 53, which is connected to the pressure relief bypass pipe 34.

[0036] In the above text, heat exchanger 1 refers to a heat exchange device with an independent medium flow channel, which achieves heat transfer by isolating the primary and secondary medium flow channels. Primary side piping system 2 refers to the circulation piping connected to an external cold source. Secondary side piping system 3 refers to the circulation piping connected to the equipment being cooled. Water tank 33 is a device used to buffer coolant. The first intelligent water pump 41 is an automated water supply device integrating modern sensing, communication, and control technologies. By monitoring parameters such as pressure and flow rate in real time and dynamically adjusting its operating status, it achieves efficient and energy-saving water supply management. The first intelligent water pump 41 performs primary pressure relief. Pressure relief bypass pipe 34 refers to an auxiliary pipe connecting the secondary side supply pipe 31 and water tank 33. Water tank pressure relief valve 52 and bypass pressure relief valve 53 are devices used to regulate and protect the system. Their main function is to release excess pressure when the system pressure is too high to prevent system damage or performance degradation. Bypass pressure relief valve 53 is used for secondary pressure relief. Water tank pressure relief valve 52 is used for tertiary pressure relief. The temperature and pressure sensor 61 refers to a sensing element that integrates temperature and pressure detection functions to monitor the physical parameters of the supply and return pipes in real time.

[0037] Specifically, when the secondary pipeline pressure is within the normal range, the control module maintains the pump at its rated speed, and the bypass pressure relief valve 53 remains closed. The detection component continuously collects pressure data from the secondary supply pipe 31. When the pressure exceeds the first threshold, the control module reduces the speed of the first intelligent water pump 41 to decrease flow output, achieving primary active pressure relief. If the pressure continues to rise to the second threshold, the bypass pressure relief valve 53 opens, guiding some of the high-pressure medium back to the water tank 33 via the pressure relief bypass pipe 34, achieving secondary pressure control through diversion and pressure relief. When extreme conditions cause the pressure to reach the third threshold, the water tank pressure relief valve 52 automatically opens to implement tertiary emergency pressure relief.

[0038] The above technical solution, by setting up a first intelligent water pump, a bypass pressure relief valve, a water tank pressure relief valve, a temperature and pressure sensor and a control module, achieves multi-level intelligent adjustment of the liquid-cooled CDU pressure, ensuring that the system automatically depressurizes under abnormal operating conditions, and avoiding the risk of overpressure while maintaining normal system operation.

[0039] In this embodiment, the heat exchanger 1 is a plate heat exchanger.

[0040] As described above, a plate heat exchanger is a highly efficient heat exchange device, consisting of a series of corrugated metal plates stacked together. Heat exchange occurs through these plates, primarily for heat transfer between liquids and between liquids and vapors. The core component of a plate heat exchanger is the corrugated metal plates, typically made of thermally conductive materials such as stainless steel. These plates are stacked and secured with bolts to form staggered flow channels. Hot and cold fluids flow in opposite directions within adjacent channels, achieving heat exchange through the plates.

[0041] By using the above technical solution, heat exchanger 1 can be configured as a plate heat exchanger, which can improve the heat exchange efficiency of the primary side coolant and the secondary side coolant.

[0042] In this embodiment, the water tank 33 is a closed expansion tank.

[0043] In the above text, a closed expansion tank refers to a liquid storage container with a sealed cavity and a built-in flexible diaphragm structure. The closed expansion tank absorbs the volume change of the coolant by compressing or expanding the flexible diaphragm, thus maintaining a constant pipeline pressure.

[0044] Specifically, when the secondary coolant temperature rises due to equipment heating, the liquid expands and its volume increases. At this time, the diaphragm in the expansion tank is compressed and contracts, providing storage space for the excess liquid. When the coolant temperature drops and its volume decreases, the diaphragm returns to its original position due to its own elasticity, pushing the stored liquid back into the pipeline to replenish the liquid volume.

[0045] The above technical solution configures water tank 33 as a closed expansion tank, achieving automatic regulation through the dynamic balance between gas pressure within the sealed cavity and pipeline pressure, without the need for external control intervention. Because the tank is completely sealed, the coolant has no contact with outside air, effectively preventing liquid oxidation and impurity intrusion, thus reducing system maintenance requirements.

[0046] In this embodiment, the secondary side pipeline system 3 further includes a return bypass pipe 35, the two ends of which are connected to the inlet side and the outlet side of the first intelligent water pump 41. The circulating pump group further includes a second intelligent water pump 42, which is connected to the return bypass pipe 35. The valve group further includes a second return valve 54, which is connected to the return bypass pipe 35 and located on the outlet side of the second intelligent water pump 42.

[0047] In the above text, the return bypass pipe 35 refers to the auxiliary flow channel connecting the inlet and outlet sides of the first intelligent water pump 41, used to establish a backup circulation path when the first intelligent water pump 41 malfunctions. The second intelligent water pump 42 refers to the backup power unit connected in parallel with the first intelligent water pump 41, which can be implemented using a centrifugal pump of the same model, used to provide auxiliary driving force when the first intelligent water pump 41 fails.

[0048] Specifically, when the first intelligent water pump 41 stops due to a malfunction or insufficient output pressure, the control module starts the second intelligent water pump 42, causing the coolant to flow from the inlet side of the return bypass pipe 35, where it is pressurized by the second intelligent water pump 42, to the outlet side, maintaining the secondary side circulation flow. The first and second intelligent water pumps form a parallel structure through the return bypass pipe 35.

[0049] Through the above technical solution, by setting up a return bypass pipe 35, a second intelligent water pump 42 and a second return valve 54, the second intelligent water pump 42 is immediately activated when the first intelligent water pump 41 suddenly fails, maintaining the continuous circulation of the secondary side coolant and preventing the electronic equipment from overheating and being damaged due to heat dissipation interruption.

[0050] In this embodiment, both the first return valve 51 and the second return valve 54 are one-way valves.

[0051] As mentioned above, a check valve is a type of valve that allows fluid to flow in only one direction. It is also known as a non-return valve or non-return valve and is mainly used to prevent the reverse flow of media in hydraulic or pneumatic systems.

[0052] Specifically, when the coolant in the secondary return pipe 32 and the return bypass pipe 35 is in a normal flow state, the one-way valve remains open under positive pressure, allowing the coolant to flow through the heat exchanger in a preset direction. When a fault shutdown or abnormal system pressure causes a reverse pressure difference in the pipeline, the valve core of the one-way valve is pushed by the reverse pressure, completely blocking the flow path through the mechanical sealing structure.

[0053] The above technical solution sets the first return valve 51 and the second return valve 54 as one-way valves to prevent fluid backflow.

[0054] In this embodiment, the temperature and pressure sensor 61 on the secondary side supply pipe 31 is located near its outlet end, and the temperature and pressure sensor 61 on the secondary side return pipe 32 is located near its inlet end.

[0055] In the above text, the outlet end of the secondary side liquid supply pipe 31 refers to the end position where the secondary side liquid supply pipe connects to the heat exchange area of ​​the cooling equipment, and the inlet end of the secondary side liquid return pipe 32 refers to the starting position where the secondary side liquid return pipe connects to the heat exchange area of ​​the cooling equipment.

[0056] By using the above technical solution, the temperature and pressure sensor 61 is placed near the equipment being cooled, so as to directly obtain the state of the coolant before entering the cooling equipment and accurately capture the state of the coolant after heat exchange in the cooling equipment, thereby improving the control accuracy.

[0057] In this embodiment, the detection component further includes a flow meter 62, which is connected to the secondary side supply pipe 31 and the primary side return pipe 22.

[0058] In the above text, flow meter 62 refers to a device used to measure the flow rate of liquid in a pipeline. It calculates real-time flow data by measuring the fluid velocity and the cross-sectional area of ​​the pipeline. Installing flow meter 62 on the secondary side supply pipe 31 allows direct monitoring of changes in the flow rate of coolant output to the cooled equipment. Installing flow meter 62 on the primary side return pipe 22 allows acquisition of primary side coolant recovery flow rate data.

[0059] The above technical solution, by setting up flow meter 62, ensures the safety and efficiency of the production process.

[0060] In this embodiment, the secondary side pipeline system 3 further includes a filter 36, which is connected to the secondary side return pipe 32 and located between the water tank 33 and the circulating pump group.

[0061] In the above text, filter 36 refers to a device used to intercept solid particles in the coolant, so that impurities are intercepted before entering the first intelligent water pump 41, and to prevent impurities from re-entering the heat exchanger 1 with the circulating liquid.

[0062] Specifically, when the coolant flows in the secondary return pipe 32, the impurities it carries first pass through the filter 36. The purified coolant then continues to flow to the inlet of the first intelligent water pump 41.

[0063] The above technical solution, by setting up filter 36, prevents blockage of secondary side liquid supply pipe 31 and secondary side liquid return pipe 32.

[0064] In this embodiment, an alarm system (not shown in the figure) is also included, which is electrically connected to the control module.

[0065] In the above text, the alarm system refers to a device used to monitor the operating status of the system and trigger warning signals. Specifically, it can be implemented by combining a pressure sensor with an audible and visual alarm. Abnormal status can be identified by collecting pressure data in real time and comparing it with a preset threshold.

[0066] Specifically, when the pressure exceeds the third threshold, the water tank pressure relief valve opens, and the alarm system activates an audible and visual alarm.

[0067] With the above technical solution, when the system encounters extreme operating conditions, a warning signal is issued simultaneously with the triggering of the pressure relief action, allowing operators to intervene in a timely manner to handle the abnormal operating conditions.

[0068] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A liquid-cooled CDU with secondary side pressure regulation function, comprising: The heat exchanger has a first medium flow channel and a second medium flow channel; A primary side piping system includes a primary side supply pipe and a primary side return pipe, wherein the primary side supply pipe is connected to the inlet of the first medium flow channel; and the primary side return pipe is connected to the outlet of the first medium flow channel. The secondary side piping system includes a secondary side supply pipe, a secondary side return pipe, and a water tank. The secondary side supply pipe is connected to the outlet of the second medium flow channel; the secondary side return pipe is connected to the inlet of the second medium flow channel; and the water tank is connected to the secondary side return pipe. The circulating pump set includes a first intelligent water pump, which is connected to the secondary side return pipe and located on the outlet side of the water tank. The valve assembly includes a first return valve and a water tank pressure relief valve. The first return valve is connected to the secondary side supply pipe and located on the outlet side of the first intelligent water pump. The water tank pressure relief valve is connected to the water tank. The detection component includes a temperature and pressure sensor, which is connected to the secondary side supply pipe and the secondary side return pipe; The control module is electrically connected to the circulating pump group, the valve group, and the detection component; The secondary side piping system is characterized in that it further includes a pressure relief bypass pipe, which is connected to the secondary side liquid supply pipe and the water tank, and the valve group further includes a bypass pressure relief valve, which is connected to the pressure relief bypass pipe.

2. The liquid-cooled CDU with secondary side pressure regulation function according to claim 1, characterized in that, The heat exchanger is a plate heat exchanger.

3. The liquid-cooled CDU with secondary side pressure regulation function according to claim 1, characterized in that, The water tank is a closed expansion tank.

4. The liquid-cooled CDU with secondary side pressure regulation function according to claim 1, characterized in that, The secondary side piping system also includes a return bypass pipe, the two ends of which are connected to the inlet side and the outlet side of the first intelligent water pump. The circulating pump group also includes a second intelligent water pump, which is connected to the return bypass pipe. The valve group also includes a second return valve, which is connected to the return bypass pipe and located on the outlet side of the second intelligent water pump.

5. The liquid-cooled CDU with secondary side pressure regulation function according to claim 4, characterized in that, Both the first return valve and the second return valve are one-way valves.

6. The liquid-cooled CDU with secondary side pressure regulation function according to claim 1, characterized in that, The temperature and pressure sensor on the secondary side supply pipe is located near its outlet end, and the temperature and pressure sensor on the secondary side return pipe is located near its inlet end.

7. The liquid-cooled CDU with secondary side pressure regulation function according to claim 1, characterized in that, The detection component also includes a flow meter, which is connected to the secondary side supply pipe and the primary side return pipe.

8. The liquid-cooled CDU with secondary side pressure regulation function according to claim 1, characterized in that, The secondary side piping system also includes a filter, which is connected to the secondary side return pipe and located between the water tank and the circulating pump set.

9. The liquid-cooled CDU with secondary side pressure regulation function according to claim 1, characterized in that, It also includes an alarm system, which is electrically connected to the control module.

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