Automatic liquid supplementing system and method for rack-mounted CDU

Abstract

The invention provides an automatic liquid supplementing system of a rack-mounted CDU, which is arranged in a rack and comprises a liquid supplementing pipeline, a secondary side circulation pipeline and a control module, a liquid supplementing water tank, a liquid supplementing pump and a liquid supplementing pipe are arranged on the liquid supplementing pipeline, a liquid level sensor for detecting the liquid level is arranged on the liquid supplementing water tank, a liquid outlet end of the liquid supplementing pump is connected with the secondary side circulation pipeline, and a liquid outlet end of the liquid supplementing pump is connected with the secondary side circulation pipeline. The liquid inlet end is connected with a liquid supplementing water tank or a liquid supplementing pipe, and the liquid supplementing pipe is connected with a liquid storage device arranged outside the rack through a quick connector corresponding to an internal liquid supplementing mode or an external liquid supplementing mode; a pressure detection mechanism is arranged on the secondary side circulation pipeline, and the control module can control automatic liquid supplementing or liquid supplementing stopping and the liquid supplementing mode according to the pressure value detected by the pressure detection mechanism and the liquid level value detected by the liquid level sensor. By monitoring the pressure and the liquid level of the cooling medium in real time, automatic switching between an external liquid supplementing mode and an internal liquid supplementing mode can be achieved, automatic liquid supplementing is achieved, and the system stability and the operation and maintenance efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation equipment, in particular to an automatic fluid replenishment system for a rack-type CDU, and also to a fluid replenishment method. Background Art

[0002] As data center (IDC) power density continues to increase, liquid cooling technology has become a mainstream solution due to its efficient heat dissipation capabilities. As the core equipment of liquid cooling systems, rack-mounted cooling distribution units (CDUs) must ensure stable circulation and pressure control of the cooling medium. Traditional CDU refill systems rely on manual operation or simple mechanical control of refill operations, which presents the following problems:

[0003] High dependence on manual labor: The liquid level needs to be checked regularly and the liquid needs to be replenished manually, which is inefficient and prone to system pressure fluctuations due to operational delays;

[0004] Insufficient reliability: Lack of real-time monitoring and adaptive adjustment functions, unable to respond quickly when liquid level abnormalities or leaks occur. Summary of the Invention

[0005] The present invention aims to provide an automatic fluid replenishment system for a rack-type CDU to overcome the deficiencies in the prior art.

[0006] To solve the above technical problems, the technical solution of the present invention is: an automatic fluid replenishment system for a rack-type CDU, which is arranged in a rack and includes a fluid replenishment pipeline, a secondary side circulation pipeline, and a control module; the fluid replenishment pipeline is provided with a fluid replenishment water tank, a fluid replenishment pump, and a fluid replenishment tube; the fluid replenishment water tank is provided with a liquid level sensor for detecting the liquid level in the fluid replenishment water tank; the liquid outlet end of the fluid replenishment pump is connected to the secondary side circulation pipeline through a connecting pipe, and the liquid inlet end is connected to the fluid replenishment water tank or the fluid replenishment tube through a connecting pipe, corresponding to the built-in fluid replenishment mode or the external fluid replenishment mode; the end of the fluid replenishment tube is provided with a quick-plug connector located on the rack shell, and is connected to a liquid storage device located outside the rack through the quick-plug connector; the secondary side circulation pipeline is provided with a pressure detection mechanism, and the control module is used to control fluid replenishment, and can control automatic fluid replenishment or stop fluid replenishment according to the pressure value detected by the pressure detection mechanism, and can start fluid replenishment in the built-in fluid replenishment mode or the external fluid replenishment mode according to the liquid level value detected by the liquid level sensor.

[0007] Furthermore, in the automatic liquid replenishment system of the rack-mounted CDU, the secondary side circulation pipeline includes a liquid supply pipeline and a liquid return pipeline, a zero-load conduction pipeline is provided between the liquid supply pipeline and the liquid return pipeline, and a solenoid valve is provided on the zero-load conduction pipeline.

[0008] Furthermore, in the automatic fluid replenishment system of the above-mentioned rack-mounted CDU, the pressure detection mechanism includes pressure sensor 1 and pressure sensor 2. The pressure sensor 1 and pressure sensor 2 are arranged on the liquid supply pipeline of the secondary side circulation pipeline and are arranged in sequence along the liquid flow direction of the liquid supply pipeline.

[0009] Furthermore, in the automatic liquid replenishing system of the rack-mounted CDU, the pressure detection mechanism further includes a third pressure sensor, and the third pressure sensor is provided on the liquid return pipeline of the secondary side circulation pipeline.

[0010] Furthermore, the aforementioned automatic fluid replenishment system for a rack-mounted CDU further includes a circulating water tank, which is mounted on the fluid replenishment pipeline and connected to the fluid replenishment pump and the fluid supply pipeline of the secondary circulation pipeline. Preferably, the system further includes a gas nozzle and a buffer tank, wherein the gas nozzle is fixed to the rack housing and connected to the air outlet of the circulating water tank via a pipe, and the buffer tank is connected to the circulating water tank.

[0011] Furthermore, the automatic liquid replenishment system of the rack-mounted CDU further includes a circulation pump 1 and a circulation pump 2, which are connected in parallel, and one end of the circulation pump 1 and the circulation pump 2 is connected to the circulating water tank, and the other end is connected to the liquid supply pipeline of the secondary side circulation pipeline.

[0012] Furthermore, in the automatic rehydration system of the rack-mounted CDU, a rehydration valve is provided on the rehydration pipeline. The rehydration valve is provided between the rehydration water tank and the rehydration pump, and the rehydration valve, the rehydration pump and the rehydration pipe are connected via a tee.

[0013] Furthermore, in the automatic rehydration system of the rack-mounted CDU, the rehydration water tank is further provided with a liquid inlet, which is connected to the liquid supply pipeline of the secondary circulation pipeline through an external rehydration pipeline, and the external rehydration pipeline is provided with a ball valve and a pressure relief valve arranged in sequence.

[0014] Furthermore, the automatic rehydration system of the rack-type CDU further includes a breathing valve. The rehydration water tank is provided with an air outlet. The breathing valve is fixed to the rack housing and connected to the air outlet of the rehydration water tank through a pipeline.

[0015] The present invention also provides a fluid replenishment method, comprising the following steps:

[0016] S1. When the pressure sensor 1 and the pressure sensor 2 of the pressure detection mechanism detect that the pressure of the liquid supply pipeline of the secondary side circulation pipeline is lower than the pressure setting value, the control module issues a liquid replenishment command;

[0017] S2. The control module determines whether the liquid level of the refill tank is lower than the set liquid level 1. If it is not lower than the set liquid level 1, the refill pipeline is started and the refill is performed according to the built-in refill mode; if it is lower than the set liquid level 1, the refill pipeline is started and the refill is performed according to the external refill mode.

[0018] Furthermore, the above-mentioned rehydration method, the rehydration method of the built-in rehydration mode is:

[0019] S31. When fluid replenishment is required, the control module sends a fluid replenishment command, the fluid replenishment valve opens, and the cooling medium in the fluid replenishment water tank is replenished to the fluid supply pipeline of the secondary side circulation pipeline through the fluid replenishment valve, tee, fluid replenishment pump, and circulating water tank;

[0020] S32. When pressure sensor 1 and pressure sensor 2 detect that the pressure of the liquid supply pipeline of the secondary side circulation pipeline reaches the pressure setting value, the control module issues a stop liquid replenishment command, and the liquid replenishment pump and the liquid replenishment valve are closed.

[0021] The rehydration method of the external rehydration mode is:

[0022] S41. When the liquid level sensor detects that the liquid level in the replenishing water tank is lower than the set liquid level 1, the control module controls the system to switch to the external replenishing mode, closes the replenishing valve, opens the ball valve, and issues a warning, prompting that external replenishing is required. Manually connect the quick connector at the end of the replenishing tube to the liquid storage device, and the cooling medium in the liquid storage device is replenished to the liquid supply pipeline of the secondary side circulation pipeline through the replenishing tube, tee, replenishing pump, circulating water tank, circulating pump 1 or circulating pump 2;

[0023] S42. When the pressures of the liquid supply pipe and the liquid return pipe of the secondary side circulation pipe reach the pressure setting value, the circulating water tank and the circulating pump circulate; at the same time, when the pressure on the liquid supply pipe of the secondary side circulation pipe is greater than the pressure of the pressure relief valve, the cooling medium is discharged into the liquid replenishment tank through the external liquid replenishment pipe;

[0024] S43. When the liquid level sensor detects that the liquid level in the refill tank reaches the set liquid level 2, the control module switches the external refill mode to the internal refill mode, and the refill valve opens.

[0025] Preferably, the set liquid level 1 is 10%-20% of the capacity of the replenishing water tank, and the set liquid level 2 is 70%-80% of the capacity of the replenishing water tank.

[0026] Compared with the existing technology, the beneficial effects of the present invention are: through real-time monitoring of the pressure and replenishment liquid level of the secondary side circulation pipeline, the control module adjusts the replenishment volume and pressure in real time according to the monitoring data, and can automatically switch between external replenishment mode and built-in replenishment mode to achieve automatic replenishment, reduce manual intervention, improve system stability and operation and maintenance efficiency, reduce the risk of server downtime, reduce cooling medium waste, and save system operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a schematic diagram of the automatic fluid replenishment system of the rack-mounted CDU of the present invention;

[0029] Figure 2 Schematic diagram of the structure of the automatic liquid replenishment system of the rack-mounted CDU of the present invention;

[0030] Figure 3 A schematic diagram of the partial structure of the automatic liquid replenishment system of the rack-mounted CDU of the present invention;

[0031] In the figure: 100, rack;

[0032] 1. Fluid infusion line;

[0033] 2. Secondary side circulation pipeline; 21. Liquid supply pipeline; 22. Liquid return pipeline;

[0034] 3. Fluid replenishment tank; 31. Liquid level sensor; 32. Breathing valve; 4. Fluid replenishment pump; 5. Fluid replenishment tube; 51. Quick connector;

[0035] 61. Pressure sensor 1; 62. Pressure sensor 2; 63. Pressure sensor 3;

[0036] 7. Circulating water tank; 71. Gas nozzle; 72. Buffer tank;

[0037] 81. Circulation pump 1; 82. Circulation pump 2;

[0038] 9. Liquid replenishing valve; 10. Three-way valve; 11. Zero-load conduction pipeline;

[0039] 12. External fluid infusion line; 121. Ball valve; 122. Pressure relief valve;

[0040] 13. Primary side circulation pipeline; 14. Heat exchanger; 15. Temperature sensor; 16. Flow meter; 17. Filter. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] Example 1

[0043] like Figure 1-3 As shown, an automatic fluid replenishment system for a rack-type CDU is arranged in a rack 100, including a fluid replenishment pipeline 1, a secondary side circulation pipeline 2, and a control module. The fluid replenishment pipeline 1 is provided with a fluid replenishment water tank 3, a fluid replenishment pump 4, and a fluid replenishment tube 5. The fluid replenishment water tank 3 is provided with a liquid level sensor 31 for detecting the liquid level in the fluid replenishment water tank 3. The liquid outlet end of the fluid replenishment pump 4 is connected to the secondary side circulation pipeline 2 through a connecting pipe, and the liquid inlet end is connected to the fluid replenishment water tank 3 or the fluid replenishment tube 5 through a connecting pipe, corresponding to the built-in fluid replenishment mode or the external fluid replenishment mode. The end of the fluid replenishment tube 5 is provided with a quick-connect connector 51 located on the outer shell of the rack 100, and is connected to a liquid storage device (not shown in the figure) provided outside the rack 100 through the quick-connect connector 51. The liquid storage device is a device for storing cooling medium, such as a liquid storage barrel, a liquid storage tank, etc. That is, when the liquid inlet end of the rehydration pump 4 is connected to the rehydration water tank 3, the system is in the built-in rehydration mode, and when the liquid inlet end of the rehydration pump 4 is connected to the rehydration tube 5, the system is in the external rehydration mode; a pressure detection mechanism is provided on the secondary side circulation pipeline 2, and the control module is used to control the rehydration. It can control the automatic rehydration or stop the rehydration according to the pressure value detected by the pressure detection mechanism, and can start the built-in rehydration mode or the external rehydration mode according to the liquid level value detected by the liquid level sensor 31. The rehydration system of the present invention is integrated in a 4U rack, has a compact structure, occupies a small space, and automatically rehydrates by real-time monitoring of the pressure and rehydration level of the secondary side circulation pipeline, reduces manual intervention, avoids the problem of misoperation, and improves the system operation stability and operation and maintenance efficiency.

[0044] like Figure 1 As shown, the secondary circulation pipeline 2 includes a liquid supply pipeline 21 and a liquid return pipeline 22. The pressure detection mechanism includes a pressure sensor 1 61 and a pressure sensor 2 62. The pressure sensors 1 61 and 2 62 are installed on the liquid supply pipeline 21 of the secondary circulation pipeline 2 and are arranged sequentially along the liquid flow direction of the liquid supply pipeline 21. The pressure sensors 1 61 and 2 62 are redundant to ensure real-time pressure monitoring.

[0045] like Figure 1 As shown, the pressure detection mechanism further includes a pressure sensor 3 63 , and the pressure sensor 3 63 is arranged on the return liquid pipeline 22 of the secondary side circulation pipeline 2 .

[0046] like Figure 1 、 3 As shown, the rehydration pipeline 1 is further provided with a rehydration valve 9 , which is arranged between the rehydration water tank 3 and the rehydration pump 4 , and the rehydration valve 9 , the rehydration pump 4 and the rehydration pipe 5 are connected through a tee 10 .

[0047] like Figure 1 、 3 As shown, the automatic liquid replenishment system of the rack-type CDU further includes a circulating water tank 7 , which is arranged on the liquid replenishment pipeline 1 and connected to the liquid replenishment pump 4 and the liquid supply pipeline 21 of the secondary side circulation pipeline 2 .

[0048] like Figure 1 As shown, the automatic liquid replenishment system of the rack-mounted CDU also includes a circulation pump 1 81 and a circulation pump 2 82 , which are connected in parallel. One end of each of the two pumps is connected to the circulating water tank 7 , and the other end is connected to the liquid supply line 21 of the secondary circulation line 2 . The two pumps 1 81 and 2 82 are connected in parallel, with one pump serving as a backup. The circulating water tank 7 and the two pumps 1 81 and 2 82 work together to achieve continuous and efficient heat dissipation control, preventing performance degradation or safety hazards caused by overheating and ensuring stable operation of the liquid cooling system.

[0049] like Figure 1 、 3 As shown, the liquid inlet is also provided on the liquid infusion tank 3, and the liquid inlet is connected to the liquid supply pipeline 21 of the secondary side circulation pipeline through an external liquid infusion pipeline 12. The external liquid infusion pipeline 12 is provided with a ball valve 121 and a pressure relief valve 122 arranged in sequence.

[0050] like Figure 1 、 2 As shown, the automatic rehydration system of the above-mentioned rack-type CDU also includes a breathing valve 32. The breathing valve 32 is fixed to the outer shell of the rack 100 and is connected to the air outlet of the rehydration water tank 3 through a pipeline. It has the functions of exhausting and relieving pressure, and is used to accommodate the volume changes caused by changes in water temperature to ensure the stability of the pressure in the rehydration water tank.

[0051] like Figure 1-3 As shown, the automatic rehydration system of the above-mentioned rack-type CDU also includes an air nozzle 71 and a buffer tank 72. The air nozzle 71 is fixed on the outer shell of the rack 100 and is connected to the air outlet of the circulating water tank 7 through a pipe to discharge residual air in the system. The buffer tank 72 is connected to the circulating water tank 7 to stabilize the flow rate.

[0052] In addition, if Figure 1As shown, a zero-load conducting line 11 is provided between the liquid supply line 21 and the liquid return line 22. A solenoid valve is provided on the zero-load conducting line 11. When the system is unloaded, the solenoid valve of the zero-load conducting line 11 is opened, thereby connecting the liquid supply line 21 and the liquid return line 22 to reduce the pressure difference.

[0053] In addition, if Figure 1 As shown, the secondary side circulation pipeline 2 is also provided with a temperature sensor 15, a flow meter 16, a filter 17, etc. The circulation pump can automatically adjust the water pump speed and flow rate according to the temperature signal of the temperature sensor 15 to adapt to different working conditions.

[0054] like Figure 1 、 2 As shown, the liquid cooling system of the present invention also includes a primary side circulation pipeline 13 and a heat exchanger 14. The heat exchanger 14 connects the primary side circulation pipeline 13 and the secondary side circulation pipeline 2. The primary side circulation pipeline 13 and the secondary side circulation pipeline 2 exchange heat in the heat exchanger 14.

[0055] Example 2

[0056] Based on the structure of Example 1, the present invention also provides a fluid replenishment method, comprising the following steps:

[0057] S1. When the pressure sensor 1 61 and the pressure sensor 2 62 of the pressure detection mechanism detect that the pressure of the liquid supply pipeline 21 of the secondary side circulation pipeline is lower than the pressure setting value, the control module issues a liquid replenishment command;

[0058] S2. The control module determines whether the liquid level of the refill tank 3 is lower than the set liquid level 1. If it is not lower than the set liquid level 1, the refill pipeline 1 is started and the refill is carried out according to the built-in refill mode; if it is lower than the set liquid level 1, the refill pipeline is started and the refill is carried out according to the external refill mode.

[0059] Among them, the rehydration method of the built-in rehydration mode is:

[0060] S31. When fluid replenishment is required, the control module sends a fluid replenishment command, the fluid replenishment valve 9 opens, and the cooling medium in the fluid replenishment tank is replenished to the fluid supply pipeline 21 of the secondary side circulation pipeline 2 through the fluid replenishment valve 9, the tee 10, the fluid replenishment pump 4, and the circulating water tank 7;

[0061] S32. When the pressure sensor 1 61 and the pressure sensor 2 62 detect that the pressure of the liquid supply pipeline 21 of the secondary side circulation pipeline reaches the pressure setting value, the control module issues a stop liquid replenishment command, and the liquid replenishment pump 4 and the liquid replenishment valve 9 are closed.

[0062] The rehydration method in external rehydration mode is:

[0063] S41. When the liquid level sensor 31 detects that the liquid level in the refilling water tank 3 is lower than the set liquid level 1, the control module control system switches to the external refilling mode, the refilling valve 9 is closed, the ball valve 121 is opened, and a warning is issued, prompting that external refilling is required. The quick connector 51 at the end of the refilling tube 5 is manually connected to the liquid storage device. The cooling medium in the liquid storage device is replenished to the liquid supply pipeline 21 of the secondary side circulation pipeline through the refilling tube 5, the tee 10, the refilling pump 4, the circulating water tank 7, the circulating pump 1 81 or the circulating pump 2 82;

[0064] S42. When the pressures of the liquid supply line 31 and the liquid return line 22 of the secondary side circulation pipeline reach the pressure setting values, that is, the pressure sensor 1 61, the pressure sensor 2 62, and the pressure sensor 3 63 all reach the pressure setting values, the circulating water tank 7 and the circulating pump circulate; at the same time, when the pressure on the liquid supply line 21 of the secondary side circulation pipeline is greater than the pressure of the pressure relief valve 122, the cooling medium is discharged to the liquid replenishment tank 3 through the external liquid replenishment line 12; when external liquid replenishment is performed, the liquid supply line is replenished first, and the liquid replenishment tank is replenished at the same time.

[0065] S43. When the liquid level sensor 31 detects that the liquid level of the liquid replenishing tank 3 reaches the set liquid level 2, the control module switches the external liquid replenishing mode to the internal liquid replenishing mode, and the liquid replenishing valve 9 opens.

[0066] The first liquid level is set to 10%-20% of the capacity of the replenishing water tank 3 , and the second liquid level is set to 70%-80% of the capacity of the replenishing water tank 3 .

[0067] In addition, it should be noted that when the system is used for the first time, the external fluid replenishment mode is also used for fluid replenishment.

[0068] The automatic liquid replenishment system of the rack-type CDU of the present invention has a system pressure fluctuation range of ±0.1 bar and a response time of <3 seconds (refer to national standard GB / T 13384-2008) under rated load (50kW), and has good operating stability.

[0069] The replenishment tank takes ≤2 minutes to replenish from the lower limit (20%) of the liquid level to the upper limit (80%), with a flow error of <3% and high replenishment efficiency.

[0070] After 1000 hours of continuous operation, the rehydration system has no faults and the sensor signal drift is less than 0.5%, indicating good operational reliability.

[0071] In summary, the present invention monitors the pressure and liquid level of the cooling medium in real time, and the control module adjusts the fluid replenishment volume and pressure in real time according to the monitoring data. It can automatically switch between the external fluid replenishment mode and the built-in fluid replenishment mode to achieve automatic fluid replenishment, reduce manual intervention, improve system stability and operation and maintenance efficiency, reduce the risk of server downtime, reduce cooling medium waste, and save system operation and maintenance costs.

[0072] The present invention is mainly suitable for liquid-cooled CDU systems in scenarios such as data centers and high-performance computing clusters, and is compatible with cooling media such as deionized water, ethylene glycol (EG25), and propylene glycol (PG25).

[0073] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0074] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An automatic fluid replenishment system for a rack-mounted CDU, characterized by: It is arranged in the frame, including a fluid infusion pipeline, a secondary side circulation pipeline, and a control module. The fluid infusion pipeline is provided with a fluid infusion water tank, a fluid infusion pump, and a fluid infusion tube. The fluid infusion water tank is provided with a liquid level sensor for detecting the liquid level in the fluid infusion water tank. The liquid outlet end of the fluid infusion pump is connected to the secondary side circulation pipeline through a connecting pipe, and the liquid inlet end is connected to the fluid infusion water tank or the fluid infusion tube through a connecting pipe, corresponding to the built-in fluid infusion mode or the external fluid infusion mode. The end of the fluid infusion tube is provided with a quick-plug connector located on the frame shell, and is connected to a liquid storage device located outside the frame through the quick-plug connector; a pressure detection mechanism is provided on the secondary side circulation pipeline, and the control module is used to control fluid infusion. It can control automatic fluid infusion or stop fluid infusion according to the pressure value detected by the pressure detection mechanism, and can start fluid infusion in the built-in fluid infusion mode or the external fluid infusion mode according to the liquid level value detected by the liquid level sensor.

2. The automatic liquid replenishment system for a rack-mounted CDU according to claim 1, characterized in that: The secondary side circulation pipeline includes a liquid supply pipeline and a liquid return pipeline. A zero-load conduction pipeline is provided between the liquid supply pipeline and the liquid return pipeline, and a solenoid valve is provided on the zero-load conduction pipeline.

3. The automatic fluid replenishment system for a rack-mounted CDU according to claim 1 or 2, characterized in that: The pressure detection mechanism includes pressure sensor 1 and pressure sensor 2. The pressure sensor 1 and pressure sensor 2 are arranged on the liquid supply pipeline of the secondary side circulation pipeline and are arranged in sequence along the liquid flow direction of the liquid supply pipeline.

4. The automatic liquid replenishment system for a rack-mounted CDU according to claim 3, characterized in that: The pressure detection mechanism further includes a third pressure sensor, which is arranged on the liquid return pipeline of the secondary side circulation pipeline.

5. The automatic liquid replenishment system for a rack-mounted CDU according to claim 1, characterized in that: It also includes a circulating water tank, which is arranged on the liquid infusion pipeline and is connected to the liquid infusion pump and the liquid supply pipeline of the secondary side circulation pipeline.

6. The automatic liquid replenishment system for a rack-mounted CDU according to claim 5, characterized in that: It also includes a circulation pump 1 and a circulation pump 2, which are connected in parallel, and one end of the circulation pump 1 and the circulation pump 2 is connected to the circulating water tank, and the other end is connected to the liquid supply pipeline of the secondary side circulation pipeline.

7. The automatic fluid replenishment system for a rack-mounted CDU according to claim 1, characterized in that: The rehydration pipeline is further provided with a rehydration valve, which is arranged between the rehydration water tank and the rehydration pump, and the rehydration valve, the rehydration pump and the rehydration pipe are connected through a tee.

8. The automatic liquid replenishment system for a rack-mounted CDU according to claim 1, characterized in that: The rehydration water tank is also provided with a liquid inlet, which is connected to the liquid supply pipeline of the secondary side circulation pipeline through an external rehydration pipeline. The external rehydration pipeline is provided with a ball valve and a pressure relief valve arranged in sequence.

9. The automatic liquid replenishment system for a rack-mounted CDU according to claim 1, characterized in that: It also includes a breathing valve. The rehydration water tank is provided with an air outlet. The breathing valve is fixed on the frame shell and connected to the air outlet of the rehydration water tank through a pipeline.

10. A fluid replenishment method, applied to the automatic fluid replenishment system of the rack-mounted CDU according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. When the pressure sensor 1 and the pressure sensor 2 of the pressure detection mechanism detect that the pressure of the liquid supply pipeline of the secondary side circulation pipeline is lower than the pressure setting value, the control module issues a liquid replenishment command; S2. The control module determines whether the liquid level of the refill tank is lower than the set liquid level 1. If it is not lower than the set liquid level 1, the refill pipeline is started and the refill is performed according to the built-in refill mode; if it is lower than the set liquid level 1, the refill pipeline is started and the refill is performed according to the external refill mode.

11. The fluid replenishing method according to claim 10, characterized in that: The rehydration method of the built-in rehydration mode is: S31. When fluid replenishment is required, the control module sends a fluid replenishment command, the fluid replenishment valve opens, and the cooling medium in the fluid replenishment water tank is replenished to the fluid supply pipeline of the secondary side circulation pipeline through the fluid replenishment valve, tee, fluid replenishment pump, and circulating water tank; S32. When pressure sensor 1 and pressure sensor 2 detect that the pressure of the liquid supply pipeline of the secondary side circulation pipeline reaches the pressure setting value, the control module issues a stop liquid replenishment command, and the liquid replenishment pump and the liquid replenishment valve are closed. The rehydration method of the external rehydration mode is: S41. When the liquid level sensor detects that the liquid level in the replenishing water tank is lower than the set liquid level 1, the control module controls the system to switch to the external replenishing mode, closes the replenishing valve, opens the ball valve, and issues a warning, prompting that external replenishing is required. Manually connect the quick connector at the end of the replenishing tube to the liquid storage device, and the cooling medium in the liquid storage device is replenished to the liquid supply pipeline of the secondary side circulation pipeline through the replenishing tube, tee, replenishing pump, circulating water tank, circulating pump 1 or circulating pump 2; S42. When the pressures of the liquid supply pipe and the liquid return pipe of the secondary side circulation pipe reach the pressure setting value, the circulating water tank and the circulating pump circulate; at the same time, when the pressure on the liquid supply pipe of the secondary side circulation pipe is greater than the pressure of the pressure relief valve, the cooling medium is discharged into the liquid replenishment tank through the external liquid replenishment pipe; S43. When the liquid level sensor detects that the liquid level in the refill tank reaches the set liquid level 2, the control module switches the external refill mode to the internal refill mode, and the refill valve opens.

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