A rack air liquid cooling distribution unit

Abstract

The utility model relates to cold distribution unit technical field, concretely is a kind of pipe external rack wind liquid type cold distribution unit. The pipe external rack wind liquid type cold distribution unit, including cabinet and its inside heat exchanger, fan is equipped on cabinet, pump liquid assembly is further equipped in cabinet and is communicated with heat exchanger;Liquid supply circuit and liquid return circuit are set in the outside of cabinet, one end of liquid return circuit is communicated with the water outlet line of equipment to be cooled, the other end of liquid return circuit is communicated with heat exchanger, one end of liquid supply circuit is communicated with the water inlet line of equipment to be cooled, the other end of liquid supply circuit is communicated with pump liquid assembly, to send the cooling working medium after heat absorption in liquid return circuit to heat exchanger and cool, then the cooling working medium after cooling is sent to liquid supply circuit. By setting liquid supply circuit and liquid return circuit in the outside of cabinet, the portability of maintenance is greatly improved, without shutdown, the maintenance of each component can be carried out, has very strong practical significance.

Description

Technical Field

[0001] This utility model relates to the technical field of cooling capacity distribution units, specifically a rack-mounted air-liquid cooling capacity distribution unit with external piping. Background Technology

[0002] The distributed air-liquid CDU integrates control, power, buffering, and heat exchange systems. It continuously pumps cooling medium at constant pressure and flow rate into the supply-side pipeline through a circulating pump. The cooling medium is then evenly distributed to each node via a rack-mounted manifold. After the cooling medium flows through the server nodes and removes heat, it flows to the return-side pipeline. The CDU heat exchange module then exchanges heat with the primary-side cold air in the computer room, removing the heat into the computer room environment. Finally, the heat is removed to the external environment by the air conditioning in the data center computer room.

[0003] However, in existing distributed air-cooled CDU structures, all components are typically housed inside the cabinet, resulting in a very compact installation space and virtually no possibility of online maintenance. Due to the limited maintenance space within the cabinet, the entire device must be shut down and the individual components pulled out when maintenance is required. This cannot meet the 24 / 7 uninterrupted operation requirements of the data center industry. Therefore, there is an urgent need to optimize the existing layout design. Utility Model Content

[0004] The purpose of this invention is to propose a rack-mounted air-liquid cooling capacity distribution unit with external piping, which aims to solve the technical problem that the existing distributed air-liquid CDU structure places the components inside the cabinet, making online maintenance inconvenient.

[0005] To achieve the above objectives, this utility model proposes a rack-mounted air-liquid cooling capacity distribution unit with external piping, including a cabinet, a heat exchanger inside the cabinet, several fans detachably mounted on the cabinet for dissipating heat from the heat exchanger, and a pump assembly inside the cabinet, which is connected to the heat exchanger. The liquid supply circuit and the liquid return circuit are located outside the cabinet. One end of the liquid return circuit is connected to the water outlet pipe of the equipment to be cooled, and the other end of the liquid return circuit is connected to the heat exchanger. One end of the liquid supply circuit is connected to the water inlet pipe of the equipment to be cooled, and the other end of the liquid supply circuit is connected to the pump assembly, so as to transport the heat-absorbing cooling medium in the liquid return circuit to the heat exchanger for cooling, and then transport the cooled cooling medium to the liquid supply circuit.

[0006] Preferably, the heat exchanger is provided with a guide pipe at the top, which passes through the cabinet and communicates with a needle valve to discharge gas from the top of the heat exchanger.

[0007] Preferably, the cabinet body is further provided with an electrical control module, which is mounted on a mounting plate. The mounting plate is movably mounted on the guide rail of the cabinet body so that the mounting plate and the electrical control module can be pulled out of the cabinet body.

[0008] Preferably, the return liquid circuit includes a filter, one end of which is connected to the outlet water pipe of the equipment to be cooled via a first return liquid pipe, and the other end of which is connected to a heat exchanger via a second return liquid pipe; The first return pipeline is equipped with a first filter maintenance valve, and the second return pipeline is equipped with a second filter maintenance valve.

[0009] Preferably, the first return pipeline is further provided with a pre-filter pressure sensor and a pre-filter pressure sensor maintenance valve, and the pre-filter pressure sensor and the pre-filter pressure sensor maintenance valve are located at the front end of the first filter maintenance valve; The second return pipeline is equipped with a post-filter pressure sensor and a post-filter pressure sensor maintenance valve, and the post-filter pressure sensor and the post-filter pressure sensor maintenance valve are located at the rear end of the second filter maintenance valve; A return liquid temperature sensor is also provided on the first return liquid pipeline at the front end of the first filter maintenance valve.

[0010] Preferably, the return circuit further includes a bypass pipeline connected in parallel with the first return pipeline and the second return pipeline, and the bypass pipeline is equipped with a filter bypass valve.

[0011] Preferably, the liquid supply circuit includes a flow meter, one end of which is connected to the water inlet pipe of the equipment to be cooled via a pipe, and the other end of which is connected to the pump assembly via a pipe; The flow meter is equipped with a liquid supply pressure sensor and a liquid supply temperature sensor on the pipe at the front end.

[0012] Preferably, both the liquid supply circuit and the liquid return circuit are equipped with drain valves for draining liquid.

[0013] Preferably, the liquid supply circuit and the liquid return circuit are connected through a first pipeline, and a first bypass valve is provided on the first pipeline.

[0014] Preferably, the pump assembly includes an expansion tank and a pump body connected in sequence, and the pump body is connected to the liquid supply circuit; The pump assembly also includes a water tank and a replenishment pump. The water tank is detachably installed inside the cabinet. One end of the replenishment pump is connected to the water tank through a pipe, and the other end of the replenishment pump is connected to the liquid supply circuit through a pipe. The water tank is equipped with a first liquid level sensor and a second liquid level sensor. The first liquid level sensor is used to detect the lowest liquid level in the water tank, and the second liquid level sensor is used to detect the highest liquid level in the water tank.

[0015] The externally mounted rack-mounted air-liquid cooling capacity distribution unit disclosed in this utility model has the following beneficial effects: 1. The externally mounted rack-mounted air-liquid cooling distribution unit mainly includes a heat exchanger, a fan, and a pump assembly. The heat exchanger works in conjunction with the fan to quickly remove heat through air cooling, and the circulating cooling medium in the heat exchanger achieves efficient dual heat dissipation. The pump assembly receives the cooling medium after heat absorption from the return assembly and drives the cooling medium to circulate within the heat exchanger to deliver the cooled cooling medium to the supply circuit. Notably, this solution places the supply circuit and return circuit outside the cabinet, greatly improving the portability of maintenance. Maintenance of each component can be performed without stopping the machine and removing the cabinet, which has strong practical significance.

[0016] 2. A guide pipe and needle valve are installed at the top of the heat exchanger to discharge gas from the top, ensuring normal flow of the cooling medium and preventing dry running of the pump components and cavitation problems. Furthermore, the needle valve is externally mounted, eliminating the problem of rapid venting caused by installation limitations for the air-liquid CDU system, significantly reducing maintenance difficulty. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the externally mounted rack-type air-liquid cooling capacity distribution unit of this utility model; Figure 2 This is a structural schematic diagram of the externally mounted rack-type air-liquid cooling capacity distribution unit of this utility model from another angle. Figure 3 This is a schematic diagram of the internal structure of the externally mounted rack-type air-liquid cooling capacity distribution unit of this utility model. Figure 4 This is a structural schematic diagram of the internal structure of the externally mounted rack-type air-liquid cooling capacity distribution unit of this utility model from another angle. Figure 5 This is a schematic diagram of the structure of the externally mounted rack-mounted air-liquid cooling capacity distribution unit of this utility model when the electrical control module is pulled out.

[0019] In the attached diagram: 1-Cabinet, 2-Heat Exchanger, 21-Guide Pipe, 22-Needle Valve, 23-Mounting Plate, 24-Guide Rail, 3-Fan, 4-Pump Liquid Assembly, 41-Expansion Tank, 42-Pump Body, 43-Water Tank, 431-First Liquid Level Sensor, 432-Second Liquid Level Sensor, 44-Replenishment Pump, 5-Supply Circuit, 51-Flow Meter, 52-Supply Pressure Sensor, 53-Supply Temperature Sensor, 54-Drain Valve, 6-Return Circuit, 60- Filter, 61-First return liquid pipeline, 611-First filter maintenance valve, 62-Second return liquid pipeline, 621-Second filter maintenance valve, 63-Pre-filter pressure sensor, 64-Pre-filter pressure sensor maintenance valve, 65-Post-filter pressure sensor, 66-Post-filter pressure sensor maintenance valve, 67-Return liquid temperature sensor, 68-Bypass pipeline, 681-Filter bypass valve, 7-Electrical control module, 8-First pipeline, 81-First bypass valve.

[0020] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] 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 some embodiments of the present utility model, and not all embodiments. 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.

[0022] It should be noted that if the embodiments of this utility model involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0023] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0024] like Figures 1 to 5 As shown, a rack-mounted air-liquid cooling capacity distribution unit with external piping includes a cabinet 1, a heat exchanger 2 is provided inside the cabinet 1, and several fans 3 for dissipating heat from the heat exchanger 2 are detachably provided on the cabinet 1. A pump assembly 4 is also provided inside the cabinet 1, and the pump assembly 4 is connected to the heat exchanger 2. The liquid supply circuit 5 and the liquid return circuit 6 are located outside the cabinet 1. One end of the liquid return circuit 6 is connected to the water outlet pipe of the equipment to be cooled, and the other end of the liquid return circuit 6 is connected to the heat exchanger 2. One end of the liquid supply circuit 5 is connected to the water inlet pipe of the equipment to be cooled, and the other end of the liquid supply circuit 5 is connected to the pump assembly 4, so as to transport the heat-absorbing cooling medium in the liquid return circuit 6 to the heat exchanger 2 for cooling, and then transport the cooled cooling medium to the liquid supply circuit 5.

[0025] The externally mounted rack-mounted air-liquid cooling distribution unit mainly includes a heat exchanger 2, a fan 3, and a pump assembly 4. The fan 3 is detachably mounted on the cabinet 1 for easy independent maintenance or replacement, enhancing heat dissipation flexibility. Multiple fans 3 can be installed on the cabinet 1, with redundant layout improving system reliability. The heat exchanger 2 works in conjunction with the fan 3 to quickly remove heat through air cooling, achieving efficient dual heat dissipation through the circulation of the cooling medium in the heat exchanger 2. The pump assembly 4 receives the cooling medium after heat absorption from the return liquid assembly and drives the cooling medium to circulate within the heat exchanger 2 to deliver the cooled cooling medium to the supply liquid circuit 5. All of the above structures are integrated inside the cabinet 1, resulting in a compact structure that optimizes space utilization. The enclosed design reduces external interference and ensures stable system operation. In particular, in order to solve the problem that the rack-mounted air-liquid CUD structure in the existing technology cannot be maintained online, this solution places most of the key components, such as the liquid supply circuit 5 and the liquid return circuit 6, outside the cabinet 1. By adopting the above-mentioned external structure, the portability of maintenance is greatly improved. Maintenance of each component can be carried out without stopping the machine and removing the cabinet 1, which has strong practical significance.

[0026] Furthermore, the heat exchanger 2 is provided with a guide pipe 21 at the top, which passes through the cabinet 1 and communicates with the needle valve 22 to discharge gas from the top of the heat exchanger 2.

[0027] like Figure 2 As shown, during operation or initial commissioning of the air-liquid CDU system, air easily mixes into the cooling medium (such as ethylene glycol solution or customized non-aqueous media), forming bubbles. These bubbles accumulate in the dead corners of heat exchanger 2, such as high points of pipes or microchannels, in the circulation loop, hindering the flow of the cooling medium, reducing heat exchange efficiency, and even causing the pump to run dry. Traditional systems rely on natural venting. Although automatic venting valves are provided, due to the compact internal structure and complex piping layout of the air-liquid CDU system, the automatic venting valve is often not installed at the highest point, but rather in the middle or lower part of heat exchanger 2. However, the gas density is low, and it is mainly concentrated at the top of the copper tubes and aluminum fins of heat exchanger 2, making it difficult to completely vent the gas. In addition, the air-liquid CDU system is often installed at the bottom of the cabinet, leaving almost no space for manual assistance in venting maintenance.

[0028] Therefore, this solution includes a guide pipe 21 and a needle valve 22 at the highest point of the copper tube aluminum finned heat exchanger 2. If the gas fails to exit through the automatic exhaust valve of the heat exchanger 2 during high-speed flow, it will accumulate at the top of the heat exchanger 2. Manually unscrewing the valve cap of the needle valve 22 and gently pressing the pin will release the gas from the heat exchanger 2, ensuring the normal flow of the cooling medium and preventing the pump fluid assembly 4 from running dry and causing cavitation problems. The needle valve 22 in this solution is also externally mounted, fundamentally solving the operational challenges for maintenance personnel. This eliminates the problem of rapid exhaust caused by installation limitations in the air-liquid CDU system, significantly reducing maintenance difficulty and greatly improving maintenance convenience.

[0029] Furthermore, the cabinet 1 is also equipped with an electrical control module 7, which is mounted on a mounting plate 23. The mounting plate 23 is movably mounted on a guide rail 24 of the cabinet 1 so that the mounting plate 23 and the electrical control module 7 can be pulled out of the cabinet 1.

[0030] In this embodiment, as Figures 4 to 5 As shown, this air-liquid CDU system further improves the ease of maintenance by optimizing the layout and maintenance design of the electrical control module 7. The electrical control module 7 centralizes the electrical control functions of the management system, ensuring the coordinated operation of components such as the fan 3, heat exchanger 2, and pump assembly 4. Through the cooperation of the electrical control module 7 with the mounting plate 23 and guide rail 24, it supports an overall pull-out design, allowing the electrical control module 7 to be quickly pulled out of the cabinet 1 for easy inspection, debugging, or replacement, avoiding downtime. Furthermore, multiple cable trays can be installed on the inner side of the mounting plate 23 to prevent internal cables from becoming tangled.

[0031] Furthermore, the return liquid circuit 6 includes a filter 60, one end of which is connected to the outlet water pipe of the equipment to be cooled through a first return liquid pipe 61, and the other end of which is connected to the heat exchanger 2 through a second return liquid pipe 62. The first return pipe 61 is provided with a first filter maintenance valve 611, and the second return pipe 62 is provided with a second filter maintenance valve 621.

[0032] like Figures 1 to 4 As shown, in the return circuit 6, the filter 60 can effectively intercept impurity particles in the cooling medium, prevent the heat exchanger 2 and / or the pump liquid assembly 4 from clogging, and extend the service life of the core components; while the first / second filter maintenance valve 621 is respectively set on the return pipes at the front and rear ends of the filter 60, which can isolate the filter 60 after closing, making it convenient to disassemble, clean or replace the filter 60.

[0033] Furthermore, the first return liquid pipeline 61 is also provided with a pre-filter pressure sensor 63 and a pre-filter pressure sensor maintenance valve 64, and the pre-filter pressure sensor 63 and the pre-filter pressure sensor maintenance valve 64 are located at the front end of the first filter maintenance valve 611. The second return pipeline 62 is equipped with a post-filter pressure sensor 65 and a post-filter pressure sensor maintenance valve 66, and the post-filter pressure sensor 65 and the post-filter pressure sensor maintenance valve 66 are located at the rear end of the second filter maintenance valve 621. A return liquid temperature sensor 67 is also provided on the first return liquid pipeline 61 at the front end of the first filter maintenance valve 611.

[0034] The pre- / post-filter pressure sensor 65 in the return circuit 6 can accurately monitor the pressure difference before and after the filter 60, detecting the real-time pressure of the coolant and providing data for maintenance. The pre- / post-filter pressure sensor maintenance valve 66 can isolate the pre- / post-filter pressure sensor 65 without interrupting system operation, facilitating its periodic calibration or replacement. Combined with the existing filter 60 maintenance valve, a segmented isolation capability of "sensor-filter 60" is formed, enabling targeted maintenance. The return temperature sensor 67 in the return circuit 6 can monitor the temperature of the coolant, and its linkage with pressure data can comprehensively assess the system's heat exchange efficiency, minimizing the risk of system downtime while ensuring maintenance convenience.

[0035] Online maintenance of pressure sensors 65 (before / after filtration): Simply close the corresponding pressure sensor maintenance valve, then unscrew the faulty pressure sensor for maintenance. No machine shutdown is required. Online maintenance of return liquid temperature sensors 67: This uses a blind-tube insertion method; simply unscrew the temperature sensor.

[0036] Furthermore, the return circuit 6 also includes a bypass pipe 68 connected in parallel with the first return pipe 61 and the second return pipe 62, and the bypass pipe 68 is provided with a filter bypass valve 681.

[0037] The bypass line 68 and the filter bypass valve 681 are mainly for the online maintenance of the filter 60: when the pressure difference across the filter 60 reaches the maintenance value, open the filter bypass valve 681, close the first filter maintenance valve 611 and the second filter maintenance valve 621, and the filter 60 can be removed for cleaning or replacement. Then reset it, open the first filter maintenance valve 611 and the second filter maintenance valve 621 in sequence, and finally close the filter bypass valve 681 to complete the maintenance.

[0038] Furthermore, the liquid supply circuit 5 includes a flow meter 51, one end of which is connected to the water inlet pipe of the equipment to be cooled via a pipe, and the other end of which is connected to the pump assembly 4 via a pipe. The flow meter 51 is equipped with a liquid supply pressure sensor 52 and a liquid supply temperature sensor 53 on the pipe at the front end.

[0039] like Figures 1 to 4 As shown, the flow meter 51 in the liquid supply circuit 5 can monitor the liquid supply flow rate in real time, ensuring that the cooling medium is delivered to the equipment to be cooled as needed and maintaining a stable heat dissipation capacity; the liquid supply pressure sensor 52 can detect the output pressure of the pump liquid assembly 4, and can diagnose pipeline blockage or leakage risks by linking with the flow data; the liquid supply temperature sensor 53 is used to monitor the supply temperature of the cooling medium. Through the combined analysis of flow-pressure-temperature data, the operating efficiency of the pump liquid assembly 4 can be optimized, and abnormal data combinations can be used to warn of system failures.

[0040] Furthermore, both the liquid supply circuit 5 and the liquid return circuit 6 are equipped with drain valves 54 for draining liquid. In this embodiment, both the liquid supply circuit 5 and the liquid return circuit 6 are equipped with drain valves 54. The drain valve 54 of the liquid supply circuit 5 is located on the second liquid return pipe 62 downstream of the second filter maintenance valve 621, and the drain valve 54 of the liquid return circuit 6 is located on the pipe downstream of the flow meter 51. The drain valves 54 are mainly used to drain the cooling working fluid in the system during disassembly.

[0041] Furthermore, the liquid supply circuit 5 and the liquid return circuit 6 are connected through a first pipe 8, on which a first bypass valve 81 is provided. The design of the first bypass valve 81 allows for adjustment of the flow rate of the liquid supply circuit 5, protecting the pump body 42 in the pump assembly 4 from operating at extremely low frequencies. By opening the first bypass valve 81, a portion of the cooling medium can be diverted back to the heat exchanger 2.

[0042] Furthermore, the pump assembly 4 includes an expansion tank 41 and a pump body 42 connected in sequence, and the pump body 42 is connected to the liquid supply circuit 5; The pump assembly 4 also includes a water tank 43 and a replenishment pump 44. The water tank 43 is detachably installed inside the cabinet 1. One end of the replenishment pump 44 is connected to the water tank 43 through a pipe, and the other end of the replenishment pump 44 is connected to the liquid supply circuit 5 through a pipe. The water tank 43 is equipped with a first liquid level sensor 431 and a second liquid level sensor 432. The first liquid level sensor 431 is used to detect the lowest liquid level of the water tank 43, and the second liquid level sensor 432 is used to detect the highest liquid level of the water tank 43.

[0043] like Figures 2 to 3 As shown, the expansion tank 41 of the pump-liquid assembly 4 is equipped with an air bladder, which can stabilize the pressure when the pressure fluctuation of the coolant is too large, thus counteracting the pressure. The coolant is transported to the supply pipeline through the pump body 42. In actual use, two pump bodies 42 can be connected in parallel. If one pump body 42 fails, the system can still operate normally. Both pump bodies are equipped with one-way valves at the rear end to ensure that the coolant flows in the direction of supply. The water tank 43 is detachably mounted on the cabinet 1 for easy and rapid replenishment, reducing maintenance downtime and improving system flexibility. Through the flow meter 51 and the pressure sensor installed in front of the pump, when the detected pressure is too low, the replenishment pump 44 is started. When the detected pressure reaches the predetermined value, the replenishment stops, realizing the above-mentioned automatic replenishment process, ensuring the stability of the system circulation flow and reducing manual intervention. In addition, the water tank 43 is equipped with minimum / maximum liquid level sensors: the first liquid level sensor 431 can alarm when the liquid level is low, prompting maintenance personnel to add water, and at the same time the replenishment pump 44 stops to prevent the replenishment pump liquid 44 component from running dry and being damaged; the second liquid level sensor 432 can detect the maximum liquid level to prevent excessive replenishment, avoid the risk of overflow, improve system reliability and maintenance efficiency, and is suitable for liquid cooling rings that need to operate stably for a long time.

[0044] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A rack-mounted, air-liquid cooling capacity distribution unit with external piping, characterized in that, Includes a cabinet (1), a heat exchanger (2) is provided inside the cabinet (1), and several fans (3) for cooling the heat exchanger (2) are detachably provided on the cabinet (1). A pump assembly (4) is also provided inside the cabinet (1), and the pump assembly (4) is connected to the heat exchanger (2). The liquid supply circuit (5) and the liquid return circuit (6) are located outside the cabinet (1). One end of the liquid return circuit (6) is connected to the water outlet pipe of the equipment to be cooled, and the other end of the liquid return circuit (6) is connected to the heat exchanger (2). One end of the liquid supply circuit (5) is connected to the water inlet pipe of the equipment to be cooled, and the other end of the liquid supply circuit (5) is connected to the pump liquid assembly (4) so ​​as to transport the heat-absorbing cooling medium in the liquid return circuit (6) to the heat exchanger (2) for cooling, and then transport the cooled cooling medium to the liquid supply circuit (5).

2. The externally mounted rack-mounted air-liquid cooling capacity distribution unit according to claim 1, characterized in that, The heat exchanger (2) is provided with a guide pipe (21) at the top, which passes through the cabinet (1) and communicates with the needle valve (22) to discharge gas from the top of the heat exchanger (2).

3. The externally mounted rack-mounted air-liquid cooling capacity distribution unit according to claim 1, characterized in that, The cabinet (1) is also equipped with an electrical control module (7), which is mounted on a mounting plate (23). The mounting plate (23) is movably mounted on the guide rail (24) of the cabinet (1) so that the mounting plate (23) and the electrical control module (7) can be pulled out of the cabinet (1).

4. The externally mounted rack-mounted air-liquid cooling capacity distribution unit according to claim 1, characterized in that, The return liquid circuit (6) includes a filter (60), one end of which is connected to the outlet water pipe of the equipment to be cooled through a first return liquid pipe (61), and the other end of which is connected to the heat exchanger (2) through a second return liquid pipe (62). The first return pipe (61) is provided with a first filter maintenance valve (611), and the second return pipe (62) is provided with a second filter maintenance valve (621).

5. A rack-mounted, externally-piped, air-liquid cooling capacity distribution unit according to claim 4, characterized in that, The first return pipe (61) is also provided with a pre-filter pressure sensor (63) and a pre-filter pressure sensor maintenance valve (64), and the pre-filter pressure sensor (63) and the pre-filter pressure sensor maintenance valve (64) are located at the front end of the first filter maintenance valve (611). The second return pipe (62) is provided with a post-filter pressure sensor (65) and a post-filter pressure sensor maintenance valve (66), and the post-filter pressure sensor (65) and the post-filter pressure sensor maintenance valve (66) are located at the rear end of the second filter maintenance valve (621); A return liquid temperature sensor (67) is also provided on the first return liquid pipeline (61) at the front end of the first filter maintenance valve (611).

6. A rack-mounted, externally-piped, air-liquid cooling capacity distribution unit according to claim 4, characterized in that, The return circuit (6) also includes a bypass line (68) connected in parallel with the first return line (61) and the second return line (62), and the bypass line (68) is provided with a filter bypass valve (681).

7. A rack-mounted, externally-piped, air-liquid cooling capacity distribution unit according to claim 1, characterized in that, The liquid supply circuit (5) includes a flow meter (51), one end of which is connected to the water inlet pipe of the equipment to be cooled through a pipe, and the other end of which is connected to the pump liquid assembly (4) through a pipe. The flow meter (51) is equipped with a liquid supply pressure sensor (52) and a liquid supply temperature sensor (53) on the pipe at the front end.

8. A rack-mounted, externally-piped, air-liquid cooling capacity distribution unit according to claim 1, characterized in that, Both the liquid supply circuit (5) and the liquid return circuit (6) are equipped with drain valves (54) for draining liquid.

9. A rack-mounted, externally-piped, air-liquid cooling capacity distribution unit according to claim 1, characterized in that, The liquid supply circuit (5) and the liquid return circuit (6) are connected through a first pipe (8), and a first bypass valve (81) is provided on the first pipe (8).

10. A rack-mounted, air-liquid cooling capacity distribution unit with external piping according to claim 1, characterized in that, The pump assembly (4) includes an expansion tank (41) and a pump body (42) connected in sequence, and the pump body (42) is connected to the liquid supply circuit (5); The pump assembly (4) also includes a water tank (43) and a replenishment pump (44). The water tank (43) is detachably installed inside the cabinet (1). One end of the replenishment pump (44) is connected to the water tank (43) through a pipe, and the other end of the replenishment pump (44) is connected to the liquid supply circuit (5) through a pipe. The water tank (43) is equipped with a first liquid level sensor (431) and a second liquid level sensor (432). The first liquid level sensor (431) is used to detect the lowest liquid level of the water tank (43), and the second liquid level sensor (432) is used to detect the highest liquid level of the water tank (43).

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