An underwater data center and a pump module maintenance operation method thereof

Abstract

The application relates to the technical field of underwater data centers, in particular to an underwater data center and a pump module maintenance operation method thereof. The pump module maintenance operation method of the underwater data center comprises the following steps: when a first pump module needs to be maintained and a second pump module can normally operate, closing an inlet connected with the first pump body, closing an outlet connected with the first return pipeline, controlling water to enter a condenser module from a second inlet pipeline, and discharging the water from a second return pipeline through a second three-way valve after completing the cooling work. Therefore, the underwater data center can continuously and normally operate when the pump module is maintained.

Description

Technical Field

[0001] This invention relates to the field of underwater data center technology, and more specifically to an underwater data center and its pump module maintenance and operation method. Background Technology

[0002] Land-based data centers are large, energy-intensive, and consume large amounts of freshwater. Meanwhile, the main users of these data centers are concentrated in developed coastal cities in China, where land resources are scarce and expensive. All newly built land-based data centers are located in the suburbs, leading to high data latency. With technological advancements, underwater data centers have emerged. Underwater data centers do not consume freshwater, using seawater for cooling; they do not require energy-intensive chillers or air conditioners, saving electricity; they do not occupy land resources; and they are located close to developed coastal cities, resulting in low data latency. As a new technological development direction, underwater data centers feature low heat dissipation and energy consumption, short construction cycles, and flexible layout.

[0003] In existing underwater data center cooling systems, when maintenance of the pump module requires shutdown, the entire system must be lifted out of the water to access the pump module. During maintenance, the pump module must be disconnected from the condenser module. This prevents the data center itself from being cooled, necessitating a shutdown and impacting the stability of continuous operation. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the underwater data center body needs to be shut down when maintaining the pump module of the underwater data center cooling system, thereby providing a method for maintaining and operating an underwater data center and its pump module.

[0005] To address the aforementioned technical problems, the present invention provides an underwater data center, comprising:

[0006] The first pump module is provided with a first inlet pipe and a first return pipe, and the first pump body is installed on the first inlet pipe;

[0007] The second pump module is provided with a second inlet pipe and a second return pipe, and the second pump body is installed on the second inlet pipe.

[0008] The data center body is equipped with a condenser module, which has an inlet and an outlet. The first pump body and the second pump body are both connected to the inlet. The first return pipe and the second return pipe are both connected to the outlet. A first branch is connected to the downstream pipe of the inlet, and a second branch is connected to the upstream pipe of the outlet.

[0009] The outlet end of the first return line is connected to the first inlet line, and the outlet end of the second return line is connected to the second inlet line. A first three-way valve is installed on the first return line, and a second three-way valve is installed on the second return line.

[0010] Optionally, control valves are installed at both the inlet and outlet of the condenser module.

[0011] Optionally, the first pump body and the second pump body are connected to the inlet via quick connectors, and the first return pipe and the second return pipe are connected to the outlet via quick connectors.

[0012] Optionally, multiple heat exchangers are connected in parallel within the condenser module, with the inlet of each heat exchanger connected to the water inlet and the outlet of each heat exchanger connected to the water outlet.

[0013] Optionally, a switch valve is installed on both the first and second branches.

[0014] This invention also provides a maintenance and operation method for an underwater data center pump module. The underwater data center described in this invention includes the following steps:

[0015] When the first pump module needs maintenance and the second pump module is operating normally, close the inlet port connected to the first pump body and close the outlet port connected to the first return pipe. Control the water to enter the condenser module from the second inlet pipe. After completing the cooling work, the water is discharged from the second return pipe through the second three-way valve.

[0016] Optionally, the following steps are included:

[0017] When the second pump module needs maintenance and the first pump module is operating normally, the inlet connected to the second pump body is closed, the outlet connected to the second return pipe is closed, and water is controlled to enter the condenser module from the first inlet pipe. After completing the cooling work, the water is discharged from the first return pipe through the first three-way valve.

[0018] Optionally, the following steps are also included:

[0019] When both the first pump module and the second pump module require maintenance, connect the maintenance submersible pump on the first branch.

[0020] Start the maintenance submersible pump, close all inlets and outlets, and control the water to enter the condenser module from the maintenance submersible pump. After the cooling work is completed, the water will be discharged from the second branch.

[0021] Optionally, before connecting the maintenance submersible pump on the first branch, the process also includes: raising the entire underwater data center above sea level.

[0022] Optionally, the following steps are also included:

[0023] After completing the maintenance of the pump module, open all inlets and outlets;

[0024] Start the first pump body, shut down the second pump body, and control the water to enter the condenser module from the first inlet pipe. After completing the cooling work, the water flows from the second return pipe into the second inlet pipe and is discharged.

[0025] The first pump body is shut down, the second pump body is started, and water is controlled to enter the condenser module from the second inlet pipe. After completing the cooling work, water flows from the first return pipe into the first inlet pipe and is discharged.

[0026] The first pump body and the second pump body start and run alternately, and the time interval between the alternation is a preset time.

[0027] The technical solution of this invention has the following advantages:

[0028] 1. The underwater data center provided by this invention, when the first pump module needs maintenance and the second pump module is operating normally, closes the inlet port connected to the first pump body and closes the outlet port connected to the first return pipe, controlling water to enter the condenser module from the second inlet pipe, and after completing the cooling work, discharges from the second return pipe through the second three-way valve. When the second pump module needs maintenance and the first pump module is operating normally, closes the inlet port connected to the second pump body and closes the outlet port connected to the second return pipe, controlling water to enter the condenser module from the first inlet pipe, and after completing the cooling work, discharges from the first return pipe through the first three-way valve. When both the first pump module and the second pump module need maintenance, connects a maintenance submersible pump to the first branch; starts the maintenance submersible pump, closes all inlets and all outlets, controls water to enter the condenser module from the maintenance submersible pump, and after completing the cooling work, discharges from the second branch. By connecting the outlet of the first return pipeline to the first inlet pipeline and installing a first three-way valve on the first return pipeline, and connecting the outlet of the second return pipeline to the second inlet pipeline and installing a second three-way valve on the second inlet pipeline, the first and second pump modules can be backflushed when the first three-way valve connects the first return pipeline to the first inlet pipeline. Similarly, when the second three-way valve connects the second return pipeline to the second inlet pipeline, the second inlet pipeline can be backflushed, enabling mutual backflushing between the first and second pump modules. When a pump module needs to be shut down for maintenance, the three-way valve of the operating pump module connects its return pipeline to the outside, allowing both the first and second pump modules to operate independently. When both pump modules need to be shut down for maintenance simultaneously, a maintenance submersible pump is connected to the first branch, and drainage is achieved through the second branch. This ensures that the underwater data center can continue to operate normally, whether only one or both pump modules require maintenance.

[0029] 2. The underwater data center provided by this invention has control valves installed at both the inlet and outlet of the condenser module. By installing these control valves, when one or both of the first and second pump modules require maintenance, the corresponding control valves can be closed to disconnect the first and second pump modules from the condenser module, facilitating operation. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of an underwater data center provided in an embodiment of the present invention.

[0032] Figure 2 This is a schematic diagram of the structure of an underwater data center provided in another embodiment of the present invention.

[0033] Figure 3 This is a schematic diagram of the structure of an underwater data center cooling system provided in another embodiment of the present invention.

[0034] Explanation of reference numerals in the attached drawings: 1. First pump module; 2. Second pump module; 3. Condenser module; 4. First filter; 5. Second filter; 6. First pump body; 7. Second pump body; 8. First three-way valve; 9. Second three-way valve; 10. First branch; 11. Second branch; 12. Flow meter; 13. Heat exchanger; 14. Pressure sensor; 15. Temperature sensor. Detailed Implementation

[0035] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] Example 1

[0040] Figure 1 The illustration shows an underwater data center provided in this embodiment. The underwater data center can be installed on the bottom of any large body of water, such as rivers, lakes, or seas. In this embodiment, the underwater data center is installed on the seabed and includes a data center body and a first pump module 1, a second pump module 2, and a condenser module 3 installed on the data center body. In actual installation, the first pump module 1, the second pump module 2, and the condenser module 3 are installed on top of the data center body. Multiple heat exchangers 13 are installed within the condenser module 3. Cooling water pumped in from the first pump module 1 and the second pump module 2 flows through one side of the heat exchanger 13, while a heat exchange medium flows through the other side. The heat exchange medium absorbs the heat dissipated by the equipment operating within the data center body and then exchanges this heat with the cooling water within the heat exchanger 13, thereby cooling the data center body.

[0041] The first pump module 1 is equipped with a first inlet pipe and a first return pipe. A first filter 4 is installed at the inlet end of the first inlet pipe, and a first pump body 6 is installed at the outlet end of the first inlet pipe. The outlet end of the first pump body 6 is connected to the outside of the first pump module 1 via a pipe. One end of the first return pipe extends to the outside of the first pump module 1, and the other end is connected to the first inlet pipe. To facilitate quick connection and docking between the first pump module 1 and the condenser module 3, quick connectors are provided at the pipe end at the outlet end of the first pump body 6 and at the end of the first return pipe extending to the outside of the first pump module 1. A first three-way valve 8 is provided on the first return pipe to control the water flow in the first return pipe to flow back into the first inlet pipe or to be discharged directly through the first three-way valve 8.

[0042] The second pump module 2 is equipped with a second inlet pipe and a second return pipe. A second filter 5 is installed at the inlet end of the second inlet pipe, and a second pump body 7 is installed at the outlet end of the second inlet pipe. The outlet end of the second pump body 7 is connected to the outside of the second pump module 2 via a pipe. One end of the second return pipe extends to the outside of the second pump module 2, and the other end is connected to the second inlet pipe. To facilitate quick connection and docking between the second pump module 2 and the condenser module 3, quick connectors are provided at the pipe end at the outlet end of the second pump body 7 and at the end of the second return pipe extending to the outside of the second pump module 2. A second three-way valve 9 is provided on the second return pipe to control the water flow in the second return pipe to flow back into the second inlet pipe or to be discharged directly through the second three-way valve 9.

[0043] The condenser module 3 is equipped with two inlets and two outlets, and quick-connect fittings are also provided at the inlets and outlets. When the first pump module 1 and the second pump module 2 are connected to the condenser module 3, pipes with quick-connect fittings at both ends are used to connect the outlet pipes of the first pump body 6 and the outlet pipes of the second pump body 7 to the two inlets, respectively, and the first return pipe and the second return pipe are connected to the two outlets, respectively. The downstream pipes of the two inlets are connected to the first branch 10, and the upstream pipes of the two outlets are connected to the second branch 11. Ball valves, acting as control valves, are provided at both the inlets and outlets of the condenser module 3 to control the on / off connection between the first pump module 1 and the second pump module 2 and the condenser module 3.

[0044] In this embodiment, the condenser module 3 is provided with four sets of heat exchangers 13 connected in parallel. The pipes downstream of the two inlets in the condenser module 3 are first merged into one pipe, and then divided into four inlet branches, which are respectively connected to the inlets of the four sets of heat exchangers 13. The pipes at the outlets of the four sets of heat exchangers 13 are first merged into one pipe, and then divided into two outlet branches, which are respectively connected to the two outlets.

[0045] Ball valves, serving as on / off valves, are installed at the outlet ends of both the first branch 10 and the second branch 11. Pressure sensors 14 are installed at the inlet and outlet ends of both the first pump body 6 and the second pump body 7 to monitor the seawater pressure in the pipeline in real time. A temperature sensor 15 and a ball valve are installed on the outlet pipeline of each heat exchanger 13. The temperature sensor 15 is used to monitor the temperature of the seawater at the outlet of the heat exchanger 13 in real time. Temperature sensors 15 are installed on the inlet pipelines of both heat exchangers 13 to monitor the temperature of the seawater entering the heat exchangers 13 in real time. During normal system operation, the seawater temperature entering multiple heat exchangers 13 is equal. Temperature sensors are only installed at the inlet of two heat exchangers 13 to monitor the inlet seawater temperature. The temperature values ​​of the two temperature sensors are compared, reducing the number of temperature sensors and lowering equipment costs. A ball valve is installed on the inlet pipeline of each heat exchanger 13 to control the on / off state of the heat exchanger 13, allowing a heat exchanger 13 to be disconnected from the pipeline when maintenance is required. Inside the condenser module 3, a flow meter 12 is installed on the pipeline where the two inlets converge downstream, to monitor the total flow rate of seawater entering the condenser module 3 in real time.

[0046] By setting up two sets of pump modules, the first pump module 1 and the second pump module 2, the underwater cooling system operates alternately. When the operating power of the first pump module 1 or the second pump module 2 cannot meet the cooling power requirements of the underwater data center, the water flow into the underwater cooling system can be increased by connecting the first filter 4 in parallel at the inlet end of the first return pipe or the second filter 5 in parallel at the inlet end of the second return pipe. This eliminates the need for additional water flow pipes, pump bodies, sensors, and other equipment, greatly simplifying the pipeline layout of the underwater cooling system, reducing the overall size of the underwater cooling system, reducing the number of components and control points in the system, and reducing the failure rate of the underwater cooling system during high-power operation.

[0047] When the first pump body 6 is operating, water flows in from the first inlet pipe and out from the second inlet pipe, backwashing the second filter 5 on the second inlet pipe. When the second pump body 7 is operating, water flows in from the second inlet pipe and out from the first inlet pipe, backwashing the first filter 4 on the first inlet pipe. By backwashing the filters, microorganisms attached to the filters can be washed off the filter screen, reducing the adhesion of microorganisms to the filters and increasing the heat exchange efficiency of the heat exchange device in the underwater data center refrigerant system.

[0048] By installing a first three-way valve 8 on the first return pipe, water from the first return pipe can enter the first inlet pipe to backwash the first filter 4 at the inlet end of the first inlet pipe. This also controls the water flow in the first return pipe to bypass the first inlet pipe and exit directly from the first three-way valve 8. Similarly, by installing a second three-way valve 9 on the second return pipe, water from the second return pipe can enter the second inlet pipe to backwash the second filter 5 at the inlet end of the second inlet pipe. This also controls the water flow in the second return pipe to bypass the first inlet pipe and exit directly from the second three-way valve 9. During the operation of the underwater data center cooling system, the first pump body 6 and the second pump body 7 operate alternately during normal system operation. When a heat exchanger 13 within the condenser module 3 malfunctions, the data center's operational requirements cannot be met if only the first pump body 6 or the second pump body 7 operates. In this case, the first pump body 6 and the second pump body 7 can be started simultaneously. Water is controlled to enter the condenser module 3 from the first inlet pipe and the second inlet pipe, and after completing the cooling process, it is discharged from the first return pipe and the second return pipe through the first three-way valve 8 and / or the second three-way valve 9. This allows the underwater data center to continue operating normally even when the heat exchanger 13 malfunctions, enabling maintenance of the malfunctioning heat exchanger 13 without shutting down the underwater data center, thus maintaining long-term stable operation.

[0049] When the first pump module 1 requires maintenance and the second pump module 2 is operating normally, close the inlet port connected to the first pump body 6 and the outlet port connected to the first return pipe. Control water to enter the condenser module 3 from the second inlet pipe. After cooling, water is discharged from the second return pipe through the second three-way valve 9. When the second pump module 2 requires maintenance and the first pump module 1 is operating normally, close the inlet port connected to the second pump body 7 and the outlet port connected to the second return pipe. Control water to enter the condenser module 3 from the first inlet pipe. After cooling, water is discharged from the first return pipe through the first three-way valve 8. When both the first pump module 1 and the second pump module 2 require maintenance, connect a maintenance submersible pump to the first branch 10; start the maintenance submersible pump, close all inlets and outlets, control water to enter the condenser module 3 from the maintenance submersible pump, and after cooling, water is discharged from the second branch 11. By connecting the outlet of the first return pipeline to the first inlet pipeline and installing a first three-way valve 8 on the first return pipeline, and connecting the outlet of the second return pipeline to the second inlet pipeline and installing a second three-way valve 9 on the second inlet pipeline, the first pump module 1 and the second pump module 2 can be backflushed when the first three-way valve 8 connects the first return pipeline to the first inlet pipeline. When the second three-way valve 9 connects the second return pipeline to the second inlet pipeline, the second inlet pipeline can be backflushed, enabling mutual backflushing between the first pump module 1 and the second pump module 2. When a pump module needs to be shut down for maintenance, the three-way valve of the operating pump module connects the return pipeline to the outside, allowing the first pump module 1 and the second pump module 2 to operate independently. When both pump modules need to be shut down for maintenance simultaneously, an external maintenance submersible pump is connected via the first branch 10, and drainage is achieved via the second branch 11, ensuring that the underwater data center can continue to operate normally regardless of whether only one pump module or both pump modules require maintenance.

[0050] As an alternative implementation method, such as Figure 2 As shown, to increase the seawater flow rate pumped by the first pump module 1 and the second pump module 2 and improve the cooling power, two sets of first filters 4 are connected in parallel at the inlet end of the first inlet pipe, and two sets of second filters 5 are connected in parallel at the inlet end of both the first and second inlet pipes. In other embodiments, the number of first filters 4 and second filters 5 connected in parallel can be set according to the cooling power requirements of the underwater data center.

[0051] As an alternative implementation method, such as Figure 3 As shown, to prevent sudden shutdown in case of pump body failure in either the first pump module 1 or the second pump module 2, two sets of the first pump body in the first pump module 1 and the second pump body in the second pump module 2 are connected in parallel. In other embodiments, the number of the first and second pump bodies connected in parallel can be set according to the usage requirements and maintenance cycle of the underwater data center.

[0052] Example 2

[0053] This embodiment provides an operation method for an underwater cooling system of an underwater data center, including an operation method under normal operating conditions, an operation method when the heat exchanger 13 needs to be shut down for maintenance, and an operation method for maintaining the pump module of the underwater data center when maintenance is required. This achieves uninterrupted maintenance of the underwater data center. Applying the underwater data center described in Embodiment 1, the method includes the following steps:

[0054] The first pump module 1 is used in conjunction with the second pump module 2. Taking the first pump module 1 as the main unit as an example, there are the following five operating conditions.

[0055] Operating Condition 1 (Normal Operating Condition): The first pump body 6 is running. Seawater is drawn in by the first filter 4 and passes through the first pump body 6, the water pump, and the flow meter 12 in sequence. It then enters the four heat exchangers 13 in the condenser module 3 to complete heat exchange. After heat exchange, it passes through the second return pipeline, the second three-way valve 9, and the second inlet pipeline, and is discharged through the second filter 5, thus achieving backwashing of the second filter 5.

[0056] Operating Condition 2 (Normal Operating Condition): The second pump body 7 is running. Seawater is drawn in by the second filter 5 and passes through the second pump body 7 and flow meter 12 in sequence into the four heat exchangers 13 in the condenser module 3. After heat exchange, it is discharged through the first return pipeline, the first three-way valve 8, and the first filter 4. The above can complete the backwashing of the first filter 4 and realize the rotation operation of the second pump body 7.

[0057] By switching between operating mode 1 and operating mode 2 at regular intervals, the alternating operation of the first pump body 6 and the second pump body 7, as well as the mutual backwashing of the first filter 4 and the second filter 5, can be completed.

[0058] Operating Condition 3 (Heat Exchanger 13 Failure Condition): In this condition, the first pump module 1 and the second pump module 2 operate simultaneously. Assuming that one of the four heat exchangers 13 fails, it is necessary to start the dual pumps in parallel to increase the flow rate and the heat exchange capacity of the other three normal heat exchangers 13, thereby ensuring the normal operation of the server equipment inside the data center. This is an emergency condition, and the operating procedure is as follows: After the condenser fails, the first pump body 6 and the second pump body 7 operate in parallel. Seawater is simultaneously drawn in by the first filter 4 and the second filter 5, and enters the normally operating heat exchanger 13 through the first pump body 6, the second pump body 7, and the flow meter 12 to complete the heat exchange. Finally, it is discharged through the first three-way valve 8 on the first return pipeline and the second three-way valve 9 on the second return pipeline.

[0059] Operating Condition 4 (Maintenance of First Pump Module 1 or Second Pump Module 2): Assuming that the first pump module 1 needs maintenance, the ball valve connecting the first pump module 1 to the condenser module 3 is closed, the second pump body 7 is running, seawater is drawn in by the second filter 5, passes through the second pump body 7 and flow meter 12 into the four heat exchangers 13 to complete heat exchange, and then flows back into the second return pipeline and is discharged through the second three-way valve 9.

[0060] Similarly, if the second pump module 2 needs maintenance, the ball valve connecting the second pump module 2 to the condenser module 3 is closed, the first pump body 6 is running, seawater is drawn in by the first filter 4, passes through the first pump body 6 and the flow meter 12 and enters the heat exchanger 13 to complete heat exchange, and finally is discharged through the first three-way valve 8.

[0061] After completing the maintenance work on the corresponding pump module, open the ball valve connecting the pump module to condenser module 3 and switch to normal operating conditions.

[0062] Operating Condition 5 (Deck Maintenance Condition): When either Pump Module 1 or Pump Module 2 requires shutdown for maintenance, or when the underwater data center needs to be raised to the deck for maintenance, the seawater pump module on the deck top cannot draw water for heat exchange when the deck is raised above sea level. To ensure the normal operation of the servers on the deck, a first branch 10 and a second branch 11 are reserved on the condenser module 3, serving as the maintenance interface inlet and outlet, respectively. The reserved pipe interfaces and ball valves of the first branch 10 and second branch 11 are normally closed. When the deck is raised to sea level, the maintenance submersible pump and hose are connected to the first branch 10 (maintenance interface inlet), and another hose is connected to the second branch 11 (maintenance interface outlet). After the seawater pump module stops operating, the reserved ball valve and maintenance submersible pump are immediately opened. At this time, the maintenance submersible pump operates, drawing in seawater, which flows through the hose to the maintenance interface inlet and flow meter 12, then enters the four sets of heat exchangers 13 to complete heat exchange, and finally exits through the maintenance interface outlet and hose.

[0063] The underwater cooling system operation method provided in this embodiment can ensure the normal operation of the servers inside the underwater data center body, whether the pump module is being maintained, the data center body is being maintained, or the heat exchanger 13 is being maintained. This allows the underwater data center to operate without downtime, thereby maintaining the long-term stable operation of the underwater data center.

[0064] 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 scope of protection of this invention.

Claims

1. An underwater data center, characterized by, The utility model relates to a kind of underwater data center cooling systems, including: First pump module (1), first inlet pipeline and first return pipeline are provided on it, first pump body (6) is installed on the first inlet pipeline; Second pump module (2), second inlet pipeline and second return pipeline are provided on it, second pump body (7) is installed on the second inlet pipeline; Data center body is installed with condenser module (3), inlet and outlet are provided on the condenser module (3), the first pump body (6) and the second pump body (7) are communicated with the inlet, the first return pipeline and the second return pipeline are communicated with the outlet, first branch (10) is communicated on the inlet downstream pipeline, second branch (11) is communicated on the outlet upstream pipeline, multiple groups of heat exchanger (13) are provided in parallel in the condenser module (3), the inlet of the heat exchanger (13) is communicated with the inlet, the outlet of multiple groups of the heat exchanger (13) is communicated with the outlet; The outlet end of the first return pipeline is communicated on the first inlet pipeline, the outlet end of the second return pipeline is communicated on the second inlet pipeline, first three-way valve (8) is provided on the first return pipeline, second three-way valve (9) is provided on the second return pipeline; When first pump module (1) needs maintenance and second pump module (2) can normally operate, close the inlet communicated with first pump body (6), close the outlet communicated with first return pipeline, control water from second inlet pipeline into condenser module (3), complete cooling work, and discharge from second return pipeline through second three-way valve (9) after cooling work is completed; After completing the maintenance of pump module, open all inlets and outlets; Further including the following steps: Step 1: start first pump body (6), close second pump body (7), control water from first inlet pipeline into condenser module (3), complete cooling work, and flow into second inlet pipeline from second return pipeline and discharge after cooling work is completed; Step 2: close first pump body (6), start second pump body (7), control water from second inlet pipeline into condenser module (3), complete cooling work, and flow into first inlet pipeline from first return pipeline and discharge after cooling work is completed; The step 1 and the step 2 are alternately operated, and the time interval of alternately operating is preset time. Control valve is provided at the inlet and outlet of the condenser module (3).

2. The underwater data center of claim 1, wherein, The first pump body (6) and the second pump body (7) are communicated with the inlet by quick connector, and the first return pipeline and the second return pipeline are communicated with the outlet by quick connector.

3. The underwater data center of claim 2, wherein, Switch valve is installed on the first branch (10) and the second branch (11).

4. The underwater data center according to any one of claims 1 to 3, characterized in that, Including the following steps:

5. The underwater data center according to any of claims 1 to 3, characterized in that, When second pump module (2) needs maintenance and first pump module (1) can normally operate, close the inlet communicated with second pump body (7), close the outlet communicated with second return pipeline, control water from first inlet pipeline into condenser module (3), complete cooling work, and discharge from first return pipeline through first three-way valve (8) after cooling work is completed. ​ 6. The underwater data center of any of claims 1 to 3, wherein, Also comprising the following steps: When the first pump module (1) and the second pump module (2) both need maintenance, the maintenance submersible pump is connected in the first branch (10); Start the maintenance submersible pump, close all water inlets and all water outlets, control the water from the maintenance submersible pump into the condenser module (3), and after completing the cooling work, discharge from the second branch (11).

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