Data center refrigeration system and liquid cooling device

Abstract

The application discloses a data center refrigeration system and a liquid cooling equipment, and the data center refrigeration system comprises a cooling structure, a heat exchange structure, a refrigeration structure, a first valve and a second valve. The first valve is arranged on a pipeline of a water return end of the heat exchange structure and is used for controlling the communication between the water return end of the heat exchange structure and a server. The second valve is arranged on a pipeline of a water return end of the refrigeration structure and is used for controlling the communication between the water return end of the refrigeration structure and the server. One technical effect of the application is that the water return end pipeline in communication with the server can be switched and selected by the first valve and the second valve, so that the refrigeration mode and the refrigeration capacity of the data center refrigeration system can be adjusted, thereby adapting to different external environments and refrigeration requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of data center refrigeration, and more particularly, to a data center refrigeration system and a liquid cooling device. BACKGROUND

[0002] In recent years, with the rapid development of new technologies such as 5G mobile communication, Internet, cloud computing, big data, Internet of Things, AR / VR, artificial intelligence, etc., data centers, as users with large energy consumption, will generate a lot of heat during operation, and the heat accumulation will affect the operation efficiency of the data center.

[0003] At present, some data centers will set servers in liquid cooling devices to cool the servers through the liquid cooling devices, thereby improving the heat dissipation effect of the servers. In the prior art, chilled water is usually used for direct cooling. However, this traditional chilled water cooling method consumes a large amount of water resources, and the refrigeration mode is single, which is difficult to adapt to different external environments and refrigeration requirements. SUMMARY

[0004] The purpose of the present application is to provide a data center refrigeration system and a liquid cooling device, which aims to solve the technical problem of single refrigeration mode of the data center refrigeration system in the prior art.

[0005] According to one aspect of the present application, a data center refrigeration system is provided.

[0006] The data center refrigeration system comprises:

[0007] a cooling structure, a heat exchange structure and a refrigeration structure, one end of the cooling structure is connected to the pipeline of the heat exchange structure and forms a cooling water circulation, the other end of the cooling structure is connected to the pipeline of the refrigeration structure and forms a refrigerant circulation, the heat exchange structure is connected between the cooling structure and the refrigeration structure, and is used for heat exchange of the cooling water flowing therethrough;

[0008] a first valve and a second valve, the first valve is arranged on the pipeline of the return water end of the heat exchange structure, and is used for controlling the communication between the return water end of the heat exchange structure and the server; the second valve is arranged on the pipeline of the return water end of the refrigeration structure, and is used for controlling the communication between the return water end of the refrigeration structure and the server.

[0009] Optionally, the data center refrigeration system comprises three refrigeration modes, in the case that the data center refrigeration system is in a first refrigeration mode, the first valve is opened, the second valve is closed, the heat exchange structure exchanges heat with the cooling water flowing therethrough to form cooling for the server, and the refrigeration structure does not work;

[0010] In the case that the data center refrigeration system is in the second refrigeration mode, the first valve is closed, the second valve is opened, and the heat exchange structure and the refrigeration structure sequentially exchange heat with the cooling water flowing therethrough to cool the servers.

[0011] In the case that the data center refrigeration system is in the third refrigeration mode, the first valve is opened, the second valve is opened, and after the heat exchange structure exchanges heat with the cooling water flowing therethrough, part of the cooling water directly flows back to the servers through the first valve to cool the servers, and the other part of the cooling water flows back to the servers through the refrigeration structure and the second valve to cool the servers.

[0012] Optionally, the heat exchange structure is provided with a water inlet end and a water return end on opposite sides, and the water inlet end on the first side of the heat exchange structure and the water return end on the first side of the heat exchange structure are connected with the servers to enable the cooling water to circulate between the servers and the heat exchange structure.

[0013] The water inlet end on the second side of the heat exchange structure and the water return end on the second side of the heat exchange structure are connected with the cooling structure to enable the cooling water to circulate between the cooling structure and the heat exchange structure to enable the cooling water on the first side of the heat exchange structure to be cooled by heat exchange, and the first valve is located on the pipeline of the water return end on the first side of the heat exchange structure.

[0014] Optionally, the water return end on the first side of the heat exchange structure further comprises a first water return pipeline and a second water return pipeline connected in parallel, the first water return pipeline and the second water return pipeline are connected between the heat exchange structure and the servers, the first valve is located on the first water return pipeline, and the refrigeration structure and the second valve are located on the second water return pipeline.

[0015] Optionally, the refrigeration structure comprises a fluorine pump and an evaporator connected by pipelines, one end of the fluorine pump and one end of the evaporator are connected with the cooling structure, the other end of the evaporator has a water inlet end and a water return end, the water inlet end of the evaporator is connected with the heat exchange structure, the water return end of the evaporator is connected with the servers, and the second valve is located on the pipeline of the water return end of the evaporator.

[0016] Optionally, the refrigeration structure further comprises a compressor, one end of the compressor is connected with the evaporator, and the other end of the compressor is connected with the cooling structure.

[0017] Optionally, the cooling structure further comprises a third valve and a fourth valve, the third valve is connected in parallel to both sides of the fluorine pump to control the communication between the fluorine pump and the evaporator, and the fourth valve is connected in parallel to both sides of the compressor to control the communication between the compressor and the evaporator.

[0018] Optionally, the cooling structure comprises a condenser and a spraying part, the condenser is connected with the refrigeration structure to form a refrigerant circulation, and the spraying part is arranged below the condenser and connected with the heat exchange structure to form a cooling water circulation.

[0019] Optionally, the cooling structure further comprises a pre-cooling part arranged between the spraying part and the heat exchange structure, and used for pre-cooling the cooling water.

[0020] According to another aspect of the present application, a liquid cooling device is provided. The liquid cooling device comprises a cabinet and the above-mentioned data center refrigeration system, the cooling structure is arranged above the cabinet, and the heat exchange structure, the refrigeration structure, the first valve and the second valve are all arranged below the cabinet.

[0021] One technical effect of the present application is that the first valve and the second valve can be used to switch and select the backwater pipeline connected with the server, so as to adjust the refrigeration mode and the refrigeration capacity of the data center refrigeration system, thereby adapting to different external environments and refrigeration requirements.

[0022] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which constitute a part of this specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application.

[0024] Figure 1 is a schematic view of a data center refrigeration system according to an embodiment of the present application;

[0025] Figure 2 is another schematic view of a data center refrigeration system according to an embodiment of the present application.

[0026] Legend of reference signs:

[0027] 1, cooling structure; 11, condenser; 12, spraying part; 13, pre-cooling part; 2, heat exchange structure; 3, refrigeration structure; 31, fluorine pump; 32, evaporator; 33, compressor; 34, third valve; 35, fourth valve; 4, first valve; 5, second valve. DETAILED DESCRIPTION

[0028] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. Note that the relative arrangement of the components and steps illustrated in these embodiments, numerical expressions, and numerical values are merely examples, and do not limit the scope of the present application unless otherwise specifically stated.

[0029] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the scope of the application, its application, or uses.

[0030] Techniques and equipment known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered part of the specification where appropriate.

[0031] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary, and not as a limitation. Thus, other examples of the exemplary embodiments can have different values.

[0032] Note that like reference numerals and letters indicate like items in the accompanying drawings and, as such, once an item is defined in one drawing, it is not necessary to discuss it further in subsequent drawings.

[0033] The present application provides a data center refrigeration system, which can be used in liquid cooling equipment of a data center, and is capable of achieving maximum utilization of natural cold sources in the refrigeration process of the data center refrigeration system to achieve a lower power usage effectiveness (PUE) and thus reduce energy consumption of the data center.

[0034] As shown in Figure 1 The data center refrigeration system provided by the embodiment of the present application comprises:

[0035] a cooling structure 1, a heat exchange structure 2, and a refrigeration structure 3, one end of the cooling structure 1 is connected to the pipeline of the heat exchange structure 2 and forms a cooling water circulation, the other end of the cooling structure 1 is connected to the pipeline of the refrigeration structure 3 and forms a refrigerant circulation, the heat exchange structure 2 is connected between the cooling structure 1 and the refrigeration structure 3 and is used for heat exchange of the cooling water flowing therethrough;

[0036] a first valve 4 and a second valve 5, the first valve 4 is arranged on the pipeline of the water return end of the heat exchange structure 2 and is used for controlling the communication between the water return end of the heat exchange structure 2 and the server, and the second valve 5 is arranged on the pipeline of the water return end of the refrigeration structure 3 and is used for controlling the communication between the water return end of the refrigeration structure 3 and the server.

[0037] As shown in Figure 1As shown, one end of the cooling structure 1 is connected with the pipeline of the heat exchange structure 2 and forms a cooling water circulation, so that the cooling water in the pipeline can be cooled by the cooling structure 1, thereby ensuring the heat exchange capacity of the heat exchange structure 2, and facilitating the cooling of the server by the heat exchange structure 2. The other end of the cooling structure 1 is connected with the pipeline of the refrigeration structure 3 and forms a refrigerant circulation, so that the high-temperature refrigerant from the refrigeration structure 3 can reach the cooling structure 1 through the pipeline and be cooled and cooled at the cooling structure 1, such as being cooled by the external natural cold source, or a cooling device can be provided for cooling. The low-temperature refrigerant after cooling and cooling can also be transmitted back to the refrigeration structure 3 through the pipeline to ensure the refrigeration capacity of the refrigeration structure 3.

[0038] As shown, Figure 1 The heat exchange structure 2 is connected between the cooling structure 1 and the refrigeration structure 3, so that the cooling water flowing out of the server can be heat exchanged by the heat exchange structure 2 to cool the server, and the cooling structure 1 can ensure the heat exchange capacity of the heat exchange structure 2. On this basis, by controlling the return water pipeline connected with the server, the refrigeration capacity of the data center refrigeration system can be controlled to adapt to different external environments and refrigeration requirements. In addition, a cooling water pump can be further provided between the cooling structure 1 and the heat exchange structure 2 to maintain the circulation of the cooling water in the data center refrigeration system by the cooling water pump.

[0039] Specifically, the first valve 4 and the second valve 5 can be respectively arranged on the pipeline of the return water end of the heat exchange structure 2 and the pipeline of the return water end of the refrigeration structure 3. The first valve 4 can control the communication between the return water end of the heat exchange structure 2 and the server, and the second valve 5 can control the communication between the return water end of the refrigeration structure 3 and the server. The first valve 4 and the second valve 5 can be electric ball valves, electronic expansion valves or solenoid valves.

[0040] For example, the first valve 4 can be controlled to be opened and the second valve 5 can be controlled to be closed to connect the return water end of the heat exchange structure 2 and the server, so that the server can be cooled by the heat exchange structure 2; the first valve 4 can be controlled to be closed and the second valve 5 can be controlled to be opened to connect the return water end of the refrigeration structure 3 and the server, so that the server can be cooled by the heat exchange structure 2 and the refrigeration structure 3; the first valve 4 and the second valve 5 can be controlled to be opened to connect the return water end of the heat exchange structure 2 and the server and the return water end of the refrigeration structure 3 and the server at the same time, so that the server can be cooled by the heat exchange structure 2 and the refrigeration structure 3 at the same time. In this way, the first valve 4 and the second valve 5 can be used to switch the return water end pipeline connected to the server, so as to adjust the refrigeration mode and the refrigeration capacity of the data center refrigeration system, so as to adapt to different external environments and refrigeration requirements, and reduce the energy consumption of the data center.

[0041] Optionally, the data center refrigeration system includes three refrigeration modes, in the case that the data center refrigeration system is in the first refrigeration mode, the first valve 4 is opened, the second valve 5 is closed, the heat exchange structure 2 exchanges heat with the cooling water flowing through to cool the server, and the refrigeration structure 3 does not work;

[0042] In the case that the data center refrigeration system is in the second refrigeration mode, the first valve 4 is closed, the second valve 5 is opened, the heat exchange structure 2 and the refrigeration structure 3 exchange heat with the cooling water flowing through to cool the server in turn;

[0043] In the case that the data center refrigeration system is in the third refrigeration mode, the first valve 4 is opened, the second valve 5 is opened, after the heat exchange structure 2 exchanges heat with the cooling water flowing through, part of the cooling water directly flows back to the server through the first valve 4 to cool the server, and the other part of the cooling water flows back to the server through the refrigeration structure 3 and the second valve 5 to cool the server.

[0044] As shown in Figure 1 The first valve 4 and the second valve 5 are used to switch the return water end pipeline connected to the server, so that the data center refrigeration system can include three refrigeration modes, which are the first refrigeration mode, the second refrigeration mode and the third refrigeration mode.

[0045] In the case that the data center refrigeration system is in the first refrigeration mode, the first valve 4 is opened to connect the return water end of the heat exchange structure 2 and the server, so that the heat exchange structure 2 exchanges heat with the cooling water flowing through to cool the server quickly, and the second valve 5 is closed, so that the refrigeration structure 3 does not work, and the energy consumption of the data center can be reduced.

[0046] In the case that the data center refrigeration system is in the second refrigeration mode, the first valve 4 is closed to disconnect the return water end of the heat exchange structure 2 and the server. The second valve 5 is opened to connect the return water end of the refrigeration structure 3 and the server, so that the cooling water can be cooled once by the heat exchange structure 2 and then cooled twice by the refrigeration structure 3, that is, the heat exchange structure 2 and the refrigeration structure 3 can exchange heat with the cooling water flowing through them in turn to form double cooling for the server, thereby ensuring the working temperature of the server.

[0047] In the case that the data center refrigeration system is in the third refrigeration mode, the first valve 4 is opened to connect the return water end of the heat exchange structure 2 and the server, so that the heat exchange structure 2 can exchange heat with the cooling water flowing through it. The second valve 5 is also opened, so that after the cooling water flowing through the heat exchange structure 2 is exchanged, part of the cooling water can directly flow back to the server through the first valve 4 to form rapid cooling for the server, and the other part of the cooling water can flow back to the server through the refrigeration structure 3 and the second valve 5 to form double cooling for the server, so as to meet the extreme or complex cooling demand.

[0048] Optionally, the heat exchange structure 2 is provided with water inlet ends and return water ends on opposite sides, and the water inlet end on the first side of the heat exchange structure 2 and the return water end on the first side of the heat exchange structure 2 are connected with the server, so that the cooling water can circulate between the server and the heat exchange structure 2.

[0049] The water inlet end on the second side of the heat exchange structure 2 and the return water end on the second side of the heat exchange structure 2 are connected with the cooling structure 1, so that the cooling water can circulate between the cooling structure 1 and the heat exchange structure 2 to form heat exchange cooling for the cooling water on the first side of the heat exchange structure 2, and the first valve 4 is located on the pipeline of the return water end on the first side of the heat exchange structure 2.

[0050] As shown in Figure 1 The heat exchange structure 2 is provided with water inlet ends and return water ends on opposite sides, the water inlet end and the return water end on the first side (that is, the side connected with the server) of the heat exchange structure 2 are connected with the server, and the water inlet end and the return water end on the second side (that is, the side not connected with the server) of the heat exchange structure 2 are connected with the cooling structure 1, so that the cooling water on the second side of the heat exchange structure 2 can form heat exchange cooling for the cooling water on the first side of the heat exchange structure 2, thereby realizing the cooling for the server.

[0051] And, the first valve 4 is arranged on the pipeline of the water return end of the first side of the heat exchange structure 2, so as to control the communication between the water return end of the first side of the heat exchange structure 2 and the server by the first valve 4, thereby adjusting the refrigeration mode and refrigeration capacity of the data center refrigeration system.

[0052] Optionally, the water return end of the first side of the heat exchange structure 2 further comprises a first water return pipeline and a second water return pipeline connected in parallel, the first water return pipeline and the second water return pipeline are both connected between the heat exchange structure 2 and the server, the first valve 4 is arranged on the first water return pipeline, and the refrigeration structure 3 and the second valve 5 are both arranged on the second water return pipeline, so as to control the opening and closing of the first water return pipeline by the first valve 4 and control the opening and closing of the second water return pipeline by the second valve 5, thereby adjusting the refrigeration mode and refrigeration capacity of the data center refrigeration system.

[0053] Optionally, the refrigeration structure 3 comprises a fluorine pump 31 and an evaporator 32 connected by pipelines, one end of the fluorine pump 31 and the evaporator 32 is connected with the cooling structure 1, the other end of the evaporator 32 has a water inlet end and a water return end, the water inlet end of the evaporator 32 is connected with the heat exchange structure 2, and the water return end of the evaporator 32 is used to be connected with the server, and the second valve 5 is arranged on the pipeline of the water return end of the evaporator 32.

[0054] As shown in Figure 2 The refrigeration structure 3 can comprise a fluorine pump 31 and an evaporator 32 connected by pipelines, so as to carry out refrigeration and cooling by fluorine refrigerant. Specifically, one end of the fluorine pump 31 and the evaporator 32 is connected with the cooling structure 1, so that the fluorine pump 31, the evaporator 32 and the cooling structure 1 can form a refrigerant circulation to ensure the refrigeration capacity. At this time, the external natural cold source can be directly used to cool the refrigerant, so as to reduce the energy consumption of the data center.

[0055] And, the other end of the evaporator 32 has a water inlet end and a water return end respectively, the water inlet end of the evaporator 32 is connected with the heat exchange structure 2, and the water return end of the evaporator 32 is used to be connected with the server, so that the cooling water flowing out of the heat exchange structure 2 can flow into the evaporator 32 from the water inlet end of the evaporator 32 and be cooled, and the cooled cooling water can flow back to the server through the water return end of the evaporator 32 to cool the server. The second valve 5 can be arranged on the pipeline of the water return end of the evaporator 32, so as to control the opening and closing of the pipeline between the water return end of the evaporator 32 and the server by the second valve 5, thereby controlling the opening and closing of the refrigeration structure 3.

[0056] Optionally, as shown in Figure 2As shown, in this embodiment of the invention, the refrigeration structure 3 may further include a compressor 33. One end of the compressor 33 is connected to the evaporator 32, and the other end of the compressor 33 is connected to the cooling structure 1. This allows the compressor 33 to drive the refrigerant to circulate between the evaporator 32 and the cooling structure 1, thereby ensuring the refrigeration effect of the evaporator 32 and improving the refrigeration capacity of the refrigeration structure 3 to meet extreme refrigeration demands.

[0057] Optionally, the refrigeration structure 3 further includes a third valve 34 and a fourth valve 35. The third valve 34 is connected in parallel to both sides of the refrigerant pump 31 to control the connection between the refrigerant pump 31 and the evaporator 32. The fourth valve 35 is connected in parallel to both sides of the compressor 33 to control the connection between the compressor 33 and the evaporator 32.

[0058] like Figure 2 As shown, the refrigeration structure 3 in this embodiment of the invention may further include a third valve 34 and a fourth valve 35, which are connected in parallel on both sides of the refrigerant pump 31 and the compressor 33, respectively, so as to control the working state of the refrigerant pump 31 and the compressor 33 respectively. For example, the third valve 34 can be set to be open and the fourth valve 35 to be closed, so that the compressor 33 is in working state and the refrigerant pump 31 is short-circuited, so that the compressor 33 can drive the refrigerant circulation to meet extreme cooling demands; or the third valve 34 can be set to be closed and the fourth valve 35 to be open, so that the refrigerant pump 31 is in working state and the compressor 33 is short-circuited, so that the refrigerant pump 31 can drive the refrigerant circulation to reduce the energy consumption of the data center.

[0059] Optionally, such as Figure 1 As shown, in this embodiment of the invention, the cooling structure 1 may include a condenser 11 and a spray section 12. The condenser 11 is connected to the refrigeration structure 3 to form a refrigerant circulation, thereby ensuring the cooling capacity of the refrigeration structure 3. The spray section 12 is positioned below the condenser 11, allowing it to connect to the heat exchange structure 2 and form a cooling water circulation. The cooling water flowing into the heat exchange structure 2 can also be sprayed and cooled by the spray section 12.

[0060] Optionally, such as Figure 1 As shown, in this embodiment of the invention, the cooling structure 1 may further include a pre-cooling section 13, which is disposed between the spray section 12 and the heat exchange structure 2. The pre-cooling section 13 includes, but is not limited to, cooling fillers such as calcite, asbestos cement, cement mesh, plastic, fiberglass, and ceramics. Using these cooling fillers can increase the heat dissipation of the cooling water and improve the cooling capacity of the data center cooling system.

[0061] The application further provides a liquid cooling device, which comprises a box body and the data center refrigeration system, the cooling structure 1 is arranged above the box body, and the heat exchange structure 2, the refrigeration structure 3, the first valve 4 and the second valve 5 are arranged below the box body, so that the space utilization of the liquid cooling device is improved, the miniaturization development of the liquid cooling device is facilitated, the connection wiring of the data center refrigeration system and the server is facilitated, and the refrigeration function of the liquid cooling device is facilitated.

[0062] The differences between the various embodiments are mainly described in the above embodiments, and the optimization features different between the various embodiments can be combined to form a better embodiment without contradiction.

[0063] Although some specific embodiments of the application have been described in detail by examples, those skilled in the art should understand that the above examples are only for illustration, but not for limiting the scope of the application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.

Claims

1. A data center cooling system, characterized in that, include: The cooling structure (1), heat exchange structure (2), and refrigeration structure (3) are provided. One end of the cooling structure (1) is connected to the pipeline of the heat exchange structure (2) to form a cooling water circulation. The other end of the cooling structure (1) is connected to the pipeline of the refrigeration structure (3) to form a refrigerant circulation. The heat exchange structure (2) is connected between the cooling structure (1) and the refrigeration structure (3) and is used to exchange heat with the flowing cooling water. A first valve (4) and a second valve (5). The first valve (4) is installed on the pipe at the return water end of the heat exchange structure (2) and is used to control the connection between the return water end of the heat exchange structure (2) and the server. The second valve (5) is installed on the pipe at the return water end of the refrigeration structure (3) and is used to control the connection between the return water end of the refrigeration structure (3) and the server. The refrigeration structure (3) includes a refrigerant pump (31) and an evaporator (32) connected by pipes. One end of the refrigerant pump (31) and the evaporator (32) are both connected to the cooling structure (1). The other end of the evaporator (32) has a water inlet and a water return. The water inlet of the evaporator (32) is connected to the heat exchange structure (2). The water return of the evaporator (32) is used to connect to the server. The second valve (5) is located on the pipe of the water return of the evaporator (32).

2. The data center cooling system according to claim 1, characterized in that, The data center cooling system includes three cooling modes. When the data center cooling system is in the first cooling mode, the first valve (4) is open, the second valve (5) is closed, the heat exchange structure (2) exchanges heat with the flowing cooling water to cool the server, and the cooling structure (3) does not work. When the data center cooling system is in the second cooling mode, the first valve (4) is closed and the second valve (5) is opened. The heat exchange structure (2) and the cooling structure (3) exchange heat with the flowing cooling water in sequence to cool the server. When the data center cooling system is in the third cooling mode, the first valve (4) is opened and the second valve (5) is opened. After the cooling water flows through the heat exchange structure (2) for heat exchange, part of the cooling water flows directly back to the server through the first valve (4) and cools the server. Another part of the cooling water flows back to the server through the cooling structure (3) and the second valve (5) and cools the server.

3. A data center cooling system according to claim 1, characterized in that, The heat exchange structure (2) is provided with an inlet end and a return end on both sides. The inlet end on the first side of the heat exchange structure (2) and the return end on the first side of the heat exchange structure (2) are both used to connect to the server so that the cooling water can circulate between the server and the heat exchange structure (2). The water inlet end and the water return end on the second side of the heat exchange structure (2) are both connected to the cooling structure (1) so that the cooling water can circulate between the cooling structure (1) and the heat exchange structure (2) to form heat exchange and cooling of the cooling water on the first side of the heat exchange structure (2). The first valve (4) is located on the pipeline of the water return end on the first side of the heat exchange structure (2).

4. A data center cooling system according to claim 3, characterized in that, The return water end on the first side of the heat exchange structure (2) further includes a first return water pipe and a second return water pipe connected in parallel. The first return water pipe and the second return water pipe are both connected between the heat exchange structure (2) and the server. The first valve (4) is located on the first return water pipe, and the refrigeration structure (3) and the second valve (5) are both located on the second return water pipe.

5. A data center cooling system according to claim 1, characterized in that, The refrigeration structure (3) also includes a compressor (33), one end of which is connected to the evaporator (32), and the other end of which is connected to the cooling structure (1).

6. A data center cooling system according to claim 5, characterized in that, The refrigeration structure (3) also includes a third valve (34) and a fourth valve (35). The third valve (34) is connected in parallel to both sides of the refrigerant pump (31) to control the connection between the refrigerant pump (31) and the evaporator (32). The fourth valve (35) is connected in parallel to both sides of the compressor (33) to control the connection between the compressor (33) and the evaporator (32).

7. A data center cooling system according to claim 1, characterized in that, The cooling structure (1) includes a condenser (11) and a spray section (12). The condenser (11) is connected to the refrigeration structure (3) and forms a refrigerant circulation. The spray section (12) is located below the condenser (11) and is connected to the heat exchange structure (2) and forms a cooling water circulation.

8. A data center cooling system according to claim 7, characterized in that, The cooling structure (1) further includes a precooling section (13), which is disposed between the spray section (12) and the heat exchange structure (2). The precooling section (13) is used to precool the cooling water.

9. A liquid cooling device, characterized in that, The system includes a housing and a data center cooling system as described in any one of claims 1 to 8, wherein the cooling structure (1) is disposed above the housing, and the heat exchange structure (2), the cooling structure (3), the first valve (4) and the second valve (5) are all disposed below the housing.

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