CN219679095U

CN219679095U - Data center refrigerating system and liquid cooling equipment

Info

Publication number: CN219679095U
Application number: CN202320655568.1U
Authority: CN
Inventors: 张炳华; 李明江; 冯淑琴
Original assignee: Hebei Qinhuai Data Co Ltd
Current assignee: Hebei Qinhuai Data Co Ltd
Priority date: 2023-03-29
Filing date: 2023-03-29
Publication date: 2023-09-12
Anticipated expiration: 2033-03-29

Abstract

The utility model discloses a data center refrigerating system and liquid cooling equipment. The first valve is arranged on a pipeline of the backwater end of the heat exchange structure and is used for controlling communication between the backwater end of the heat exchange structure and the server; the second valve is arranged on a pipeline of the backwater end of the refrigeration structure and is used for controlling communication between the backwater end of the refrigeration structure and the server. The utility model has the technical effect that the return water end pipeline communicated with the server can be switched and selected by utilizing the first valve and the second valve so as to adjust the refrigeration mode and the refrigeration capacity of the refrigeration system of the data center, thereby adapting to different external environments and refrigeration requirements.

Description

Data center refrigerating system and liquid cooling equipment

Technical Field

The utility model relates to the technical field of data center refrigeration, in particular to a data center refrigeration system and liquid cooling equipment.

Background

In recent years, with the rapid development of novel technologies such as 5G mobile communication, internet, cloud computing, big data, internet of things, AR/VR and artificial intelligence, a data center is used as a user with a larger energy use scale, more heat can be generated in the operation process, and the operation efficiency of the data center can be affected by heat aggregation.

At present, some data centers can set up the server in liquid cooling equipment, cool down the server through liquid cooling equipment to improve the radiating effect of server. In the prior art, chilled water is generally adopted to directly cool, however, the traditional chilled water cooling method needs to consume a large amount of water resources, has a single refrigeration mode, and is difficult to adapt to different external environments and refrigeration requirements.

Disclosure of Invention

The utility model aims to provide a data center refrigerating system and liquid cooling equipment, and aims to solve the technical problem that the refrigerating mode of the data center refrigerating system in the prior art is single.

According to one aspect of the present utility model, a data center refrigeration system is provided.

The data center refrigeration system includes:

the cooling device comprises a cooling structure, a heat exchange structure and a refrigerating structure, wherein one end of the cooling structure is connected with a heat exchange structure pipeline to form cooling water circulation, the other end of the cooling structure is connected with the refrigerating structure pipeline to form refrigerant circulation, and the heat exchange structure is connected between the cooling structure and the refrigerating structure and is used for carrying out heat exchange on cooling water flowing through;

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

Optionally, the data center refrigeration system comprises three refrigeration modes, when 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 cooling water flowing through to cool a server, and the refrigeration structure does not work;

when the data center refrigerating system is in a second refrigerating mode, the first valve is closed, the second valve is opened, and the heat exchange structure and the refrigerating structure sequentially exchange heat of cooling water flowing through the heat exchange structure to cool the server;

and under the condition that the data center refrigerating system is in a third refrigerating mode, the first valve is opened, the second valve is opened, after the heat exchange structure exchanges heat with the flowing cooling water, part of the cooling water directly flows back to the server through the first valve and cools the server, and the other part of cooling water flows back to the server through the refrigerating structure and the second valve and cools the server.

Optionally, the two opposite sides of the heat exchange structure are provided with a water inlet end and a water return end, and the water inlet end of the first side of the heat exchange structure and the water return end of the first side of the heat exchange structure are both used for being connected with a server so that cooling water can circulate between the server and the heat exchange structure;

the water inlet end of the second side of the heat exchange structure and the water return end of the second side of the heat exchange structure are connected with the cooling structure, so that cooling water can circulate between the cooling structure and the heat exchange structure, heat exchange cooling can be formed on the cooling water of the first side of the heat exchange structure, and the first valve is located on a pipeline of the water return end of the first side of the heat exchange structure.

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

Optionally, the refrigeration structure includes the fluorine pump and the evaporimeter that the pipeline links to each other, the fluorine pump with the one end of evaporimeter all with cooling structure links to each other, the other end of evaporimeter has into water end and return water end, the evaporimeter advance water end with heat transfer structure links to each other, the evaporimeter return water end be used for with the server links to each other, the second valve is located the evaporimeter return water end's pipeline.

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.

Optionally, the refrigeration structure further comprises a third valve and a fourth valve, wherein the third valve is connected in parallel with two sides of the fluorine pump so as to control the communication between the fluorine pump and the evaporator; the fourth valve is connected in parallel with two sides of the compressor so as to control the communication between the compressor and the evaporator.

Optionally, the cooling structure includes condenser and spray portion, the condenser with refrigeration structure links to each other and forms the refrigerant circulation, spray portion set up in the below of condenser, spray portion with heat transfer structure links to each other and forms the cooling water circulation.

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

According to another aspect of the present utility model, a liquid cooling apparatus is provided. The liquid cooling equipment comprises a box body and the data center refrigerating system, the cooling structure is arranged above the box body, and the heat exchange structure, the refrigerating structure, the first valve and the second valve are all arranged below the box body.

The utility model has the technical effect that the return water end pipeline communicated with the server can be switched and selected by utilizing the first valve and the second valve so as to adjust the refrigeration mode and the refrigeration capacity of the refrigeration system of the data center, thereby adapting to different external environments and refrigeration requirements.

Other features of the present utility model and its advantages will become apparent from the following detailed description of exemplary embodiments of the utility model, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description, serve to explain the principles of the utility model.

FIG. 1 is a schematic diagram of a data center refrigeration system according to an embodiment of the present utility model;

fig. 2 is another schematic diagram of a data center refrigeration system in accordance with an embodiment of the present utility model.

Reference numerals illustrate:

1. a cooling structure; 11. a condenser; 12. a spraying part; 13. a pre-cooling section; 2. a heat exchange structure; 3. a refrigeration structure; 31. a fluorine pump; 32. an evaporator; 33. a compressor; 34. a third valve; 35. a fourth valve; 4. a first valve; 5. and a second valve.

Detailed Description

Various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise.

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

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

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

The utility model provides a data center refrigerating system which can be used in liquid cooling equipment of a data center, and can realize the utilization of natural cold sources to the greatest extent in the refrigerating process of the data center refrigerating system so as to realize lower power utilization efficiency PUE (Power Usage Effectiveness), thereby reducing the energy consumption of the data center.

As shown in fig. 1, a data center refrigeration system provided in an embodiment of the present utility model includes:

the cooling structure comprises a cooling structure 1, a heat exchange structure 2 and a refrigerating structure 3, wherein one end of the cooling structure 1 is connected with a pipeline of the heat exchange structure 2 and forms a cooling water circulation, the other end of the cooling structure 1 is connected with a pipeline of the refrigerating structure 3 and forms a refrigerant circulation, and the heat exchange structure 2 is connected between the cooling structure 1 and the refrigerating structure 3 and is used for carrying out heat exchange on cooling water flowing through;

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

As shown in fig. 1, one end of a cooling structure 1 is connected with a pipeline of a heat exchange structure 2 to form cooling water circulation, so that cooling water in the pipeline can be cooled by the cooling structure 1, the heat exchange capability of the heat exchange structure 2 is ensured, and the cooling of a server by the heat exchange structure 2 is facilitated. The other end of the cooling structure 1 is connected with the pipeline of the refrigerating structure 3 to form a refrigerant cycle, so that the high-temperature refrigerant transmitted from the refrigerating structure 3 can reach the cooling structure 1 through the pipeline and can radiate heat and cool at the cooling structure 1, for example, an external natural cold source can be utilized for radiating heat, or a cooling device can be arranged for radiating heat. The low-temperature refrigerant after heat dissipation and temperature reduction can be transmitted back to the refrigeration structure 3 through the pipeline, so that the refrigeration capacity of the refrigeration structure 3 is ensured.

As shown in fig. 1, the embodiment of the utility model connects the heat exchange structure 2 between the cooling structure 1 and the refrigerating structure 3, so that the heat exchange structure 2 can be used for carrying out heat exchange on cooling water flowing out from the server to cool the server, and the cooling structure 1 can also ensure the heat exchange capability of the heat exchange structure 2. On the basis, the refrigerating capacity of the refrigerating system of the data center can be controlled by controlling a backwater end pipeline communicated with the server so as to adapt to different external environments and refrigerating demands. In addition, a cooling water pump can be further arranged between the cooling structure 1 and the heat exchange structure 2, so that the cooling water pump can be utilized to maintain the circulation of cooling water in the data center refrigerating system.

Specifically, a first valve 4 and a second valve 5 may be respectively disposed on the pipeline of the water return end of the heat exchange structure 2 and the pipeline of the water return end of the refrigeration structure 3, where the first valve 4 may control communication between the water return end of the heat exchange structure 2 and the server, and the second valve 5 may control communication between the water return end of the refrigeration structure 3 and the server. The first valve 4 and the second valve 5 may be electric ball valves, electronic expansion valves, electromagnetic valves, or the like.

For example, the first valve 4 can be controlled to be opened and the second valve 5 can be controlled to be closed so as to communicate the water return end of the heat exchange structure 2 with the server, and at the moment, the heat exchange structure 2 can be utilized to cool the server; the first valve 4 can be controlled to be closed and the second valve 5 can be controlled to be opened so as to communicate the backwater end of the refrigeration structure 3 with the server, and the heat exchange structure 2 and the refrigeration structure 3 can be utilized to cool the server in double modes at the moment; the first valve 4 and the second valve 5 can be controlled to be opened, so that the backwater end of the heat exchange structure 2 and the backwater end of the server and the backwater end of the refrigerating structure 3 are communicated simultaneously, and the heat exchange structure 2 can be utilized to rapidly cool the server, and the heat exchange structure 2 and the refrigerating structure 3 can be utilized to doubly cool the server. Therefore, the return water end pipeline communicated with the server can be switched by utilizing the first valve 4 and the second valve 5 so as to adjust the refrigeration mode and the refrigeration capacity of the refrigeration system of the data center, thereby adapting to different external environments and refrigeration demands and reducing the energy consumption of the data center.

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

when the data center refrigerating system is in the second refrigerating mode, the first valve 4 is closed, the second valve 5 is opened, and the heat exchange structure 2 and the refrigerating structure 3 sequentially exchange heat of the flowing cooling water to cool the server;

when the data center refrigerating system is in the third refrigerating mode, the first valve 4 is opened, the second valve 5 is opened, after the heat exchange structure 2 exchanges heat with the flowing cooling water, part of the cooling water directly flows back to the server through the first valve 4 and cools the server, and the other part of cooling water flows back to the server through the refrigerating structure 3 and the second valve 5 and cools the server.

As shown in fig. 1, in the embodiment of the present utility model, the return water pipe connected to the server is switched by using the first valve 4 and the second valve 5, so that the refrigeration system of the data center may include three refrigeration modes, that is, a first refrigeration mode, a second refrigeration mode and a third refrigeration mode.

Under the condition that the data center refrigerating system is in the first refrigerating mode, the first valve 4 is set to be opened so as to communicate the backwater end of the heat exchange structure 2 with the server, at the moment, the heat exchange structure 2 can be utilized to conduct heat exchange on flowing cooling water so as to quickly cool the server, and the second valve 5 is closed, so that the refrigerating structure 3 does not work, and the energy consumption of the data center can be reduced.

In the case of a data center refrigeration system in the second refrigeration mode, the first valve 4 is closed to disconnect the return water end of the heat exchange structure 2 from the server. And the second valve 5 is opened to communicate return water end and the server of refrigeration structure 3 for after cooling water can be through heat exchange structure 2 once cooling, flow to refrigeration structure 3 again and carry out the secondary cooling, and heat exchange can be carried out in proper order to the cooling water that flows through with refrigeration structure 3 in order to form dual cooling to the server promptly, thereby can guarantee the operating temperature of server.

Under the condition that the data center refrigerating system is in the third refrigerating mode, the first valve 4 is opened to communicate the backwater end of the heat exchange structure 2 with the server, and at the moment, heat exchange can be carried out on cooling water flowing through by the heat exchange structure 2. The second valve 5 is also opened, so that after the heat exchange structure 2 performs heat exchange on the cooling water flowing through, part of the cooling water can directly flow back to the server through the first valve 4 and 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 and form double cooling for the server, so that extreme or complex cooling requirements can be met.

Optionally, the two opposite sides of the heat exchange structure 2 are provided with a water inlet end and a water return end, and the water inlet end of the first side of the heat exchange structure 2 and the water return end of the first side of the heat exchange structure 2 are both used for being connected with a server so that cooling water can circulate between the server and the heat exchange structure 2;

the water inlet end of the second side of the heat exchange structure 2 and the water return end of the second side of the heat exchange structure 2 are connected with the cooling structure 1, so that cooling water can circulate between the cooling structure 1 and the heat exchange structure 2 to be capable of forming heat exchange and cooling for the cooling water of the first side of the heat exchange structure 2, and the first valve 4 is located on a pipeline of the water return end of the first side of the heat exchange structure 2.

As shown in fig. 1, in the embodiment of the present utility model, the water inlet end and the water return end are disposed on opposite sides of the heat exchange structure 2, the water inlet end and the water return end of the first side (i.e., the side connected to the server) of the heat exchange structure 2 are both used for being connected to the server, and the water inlet end and the water return end of the second side (i.e., the side not connected to the server) of the heat exchange structure 2 are both connected to the cooling structure 1, so that heat exchange and cooling can be formed on the cooling water of the first side of the heat exchange structure 2 by using the cooling water of the second side of the heat exchange structure 2, thereby cooling the server.

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

Optionally, the water return end of the first side of the heat exchange structure 2 further includes 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 located on the first water return pipeline, and the refrigeration structure 3 and the second valve 5 are both located on the second water return pipeline, so that the first valve 4 can be used for controlling the on-off of the first water return pipeline, and the second valve 5 can be used for controlling the on-off of the second water return pipeline, so as to adjust the refrigeration mode and the refrigeration capacity of the refrigeration system of the data center.

Optionally, the refrigeration structure 3 includes a fluorine pump 31 and an evaporator 32 connected by a pipeline, one ends of the fluorine pump 31 and the evaporator 32 are 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, the water return end of the evaporator 32 is used for being connected with a server, and the second valve 5 is located on the pipeline of the water return end of the evaporator 32.

As shown in fig. 2, the refrigerating structure 3 according to the embodiment of the present utility model may include a fluorine pump 31 and an evaporator 32 connected by a pipeline, so as to perform refrigeration and cooling by using a freon working medium. Specifically, one ends of the fluorine pump 31 and the evaporator 32 are each provided in connection with the cooling structure 1 so that the fluorine pump 31, the evaporator 32 and the cooling structure 1 can form a refrigerant cycle to secure a refrigerating capacity. At this time, the external natural cold source can be directly utilized to cool and dissipate heat of the refrigerant, so as to reduce the energy consumption of the data center.

And, the other end that sets up the evaporimeter 32 has into water end and return water end respectively, and the water end that intakes of evaporimeter 32 links to each other with heat exchange structure 2, and the return water end of evaporimeter 32 is used for linking to each other with the server for the cooling water that flows out by heat exchange structure 2 flows into evaporimeter 32 and cools down from the water end that intakes of evaporimeter 32, and the cooling water after the cooling can flow back to the server through the return water end of evaporimeter 32 in order to cool down the server. The second valve 5 may be disposed on a pipeline at the water return end of the evaporator 32, so that the second valve 5 may be used to control the on-off between the pipeline at the water return end of the evaporator 32 and the server, so as to control the on-off of the refrigeration structure 3.

Optionally, as shown in fig. 2, the embodiment of the present utility model provides that 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, so that the compressor 33 can be used 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, so as to be capable of meeting extreme refrigeration requirements.

Optionally, the refrigeration structure 3 further includes a third valve 34 and a fourth valve 35, where the third valve 34 is connected in parallel to two sides of the fluorine pump 31 to control the communication between the fluorine pump 31 and the evaporator 32; the fourth valve 35 is connected in parallel to both sides of the compressor 33 to control communication between the compressor 33 and the evaporator 32.

As shown in fig. 2, the refrigeration structure 3 according to the embodiment of the present utility model may further include a third valve 34 and a fourth valve 35, where the third valve 34 and the fourth valve 35 are respectively connected in parallel to two sides of the fluorine pump 31 and the compressor 33, so as to be capable of controlling working states of the fluorine pump 31 and the compressor 33, respectively. For example, the third valve 34 may be set to be opened and the fourth valve 35 may be set to be closed so that the compressor 33 is in an operating state and the fluorine pump 31 is short-circuited to be able to drive the refrigerant cycle by using the compressor 33 to satisfy an extreme refrigeration demand; it is also possible to provide that the third valve 34 is closed and the fourth valve 35 is opened so that the fluorine pump 31 is in an operating state and the compressor 33 is short-circuited to be able to drive the refrigerant cycle by the fluorine pump 31 to reduce the energy consumption of the data center.

Alternatively, as shown in fig. 1, the cooling structure 1 according to the embodiment of the present utility model may include a condenser 11 and a spray portion 12, where the condenser 11 is connected to the refrigeration structure 3 and forms a refrigerant cycle to ensure the refrigerating capacity of the refrigeration structure 3. The spraying part 12 is arranged below the condenser 11, so that the spraying part 12 can be connected with the heat exchange structure 2 to form cooling water circulation, and cooling water flowing in through the heat exchange structure 2 can also be sprayed and cooled through the spraying part 12.

Optionally, as shown in fig. 1, the cooling structure 1 according to the embodiment of the present utility model may further include a pre-cooling portion 13, where the pre-cooling portion 13 is disposed between the spraying portion 12 and the heat exchange structure 2, and the pre-cooling portion 13 includes, but is not limited to, cooling fillers such as a schottky material, asbestos cement, a cement grid, plastics, glass fiber reinforced plastics, and ceramics, and by using these cooling fillers, the heat dissipation capacity of cooling water can be increased, and the refrigerating capacity of the refrigeration system of the data center is also improved.

The utility model also provides liquid cooling equipment, which comprises a box body and the data center refrigerating system, wherein the cooling structure 1 is arranged above the box body, the heat exchange structure 2, the refrigerating structure 3, the first valve 4 and the second valve 5 are arranged below the box body, so that the space utilization rate of the liquid cooling equipment can be improved, the miniaturization development of the liquid cooling equipment is facilitated, the connection wiring of the data center refrigerating system and a server is also facilitated, and the realization of the refrigerating function of the liquid cooling equipment is facilitated.

The foregoing embodiments mainly describe differences between the embodiments, and as long as there is no contradiction between different optimization features of the embodiments, the embodiments may be combined to form a better embodiment, and in consideration of brevity of line text, no further description is given here.

While certain specific embodiments of the utility model have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the utility model. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the utility model. The scope of the utility model is defined by the appended claims.

Claims

1. A data center refrigeration system, comprising:

the cooling device comprises a cooling structure (1), a heat exchange structure (2) and a refrigerating structure (3), wherein one end of the cooling structure (1) is connected with a pipeline of the heat exchange structure (2) to form a cooling water circulation, the other end of the cooling structure (1) is connected with a pipeline of the refrigerating structure (3) to form a refrigerant circulation, and the heat exchange structure (2) is connected between the cooling structure (1) and the refrigerating structure (3) and is used for carrying out heat exchange on cooling water flowing through;

the first valve (4) and the second valve (5) are arranged on a pipeline of the water return end of the heat exchange structure (2) and used for controlling communication between the water return end of the heat exchange structure (2) and a server; the second valve (5) is arranged on a pipeline of the water return end of the refrigeration structure (3) and is used for controlling communication between the water return end of the refrigeration structure (3) and the server.

2. A data centre refrigeration system according to claim 1, characterized in that the data centre refrigeration system comprises three refrigeration modes, the first valve (4) being open and the second valve (5) being closed with the data centre refrigeration system in a first refrigeration mode, the heat exchange structure (2) exchanging heat with the cooling water flowing through to cool the servers, the refrigeration structure (3) not being operated;

when the data center refrigerating system is in a second refrigerating mode, the first valve (4) is closed, the second valve (5) is opened, and the heat exchange structure (2) and the refrigerating structure (3) sequentially exchange heat of cooling water flowing through to cool a server;

under the condition that the data center refrigerating system is in a third refrigerating mode, the first valve (4) is opened, the second valve (5) is opened, after the heat exchange structure (2) carries out heat exchange on cooling water flowing through, part of cooling water directly flows back to the server through the first valve (4) and forms cooling for the server, and the other part of cooling water flows back to the server through the refrigerating structure (3) and the second valve (5) and forms cooling for the server.

3. A data center refrigeration system according to claim 1, wherein the opposite sides of the heat exchange structure (2) are provided with a water inlet end and a water return end, the water inlet end of the first side of the heat exchange structure (2) and the water return end of the first side of the heat exchange structure (2) being each adapted to be connected to a server so that cooling water can circulate between the server and the heat exchange structure (2);

the water inlet end of the second side of the heat exchange structure (2) and the water return end of the second side of the heat exchange structure (2) are connected with the cooling structure (1) so that cooling water can circulate between the cooling structure (1) and the heat exchange structure (2) to enable cooling water on the first side of the heat exchange structure (2) to form heat exchange and cooling, and the first valve (4) is located on a pipeline of the water return end of the first side of the heat exchange structure (2).

4. A data centre refrigeration system according to claim 3, wherein the return water side of the first side of the heat exchange structure (2) further comprises a first return water line and a second return water line connected in parallel, both the first return water line and the second return water line being connected between the heat exchange structure (2) and the server, the first valve (4) being located on the first return water line, both the refrigeration structure (3) and the second valve (5) being located on the second return water line.

5. A data centre refrigeration system according to claim 1, wherein the refrigeration structure (3) comprises a fluorine pump (31) and an evaporator (32) connected by a pipeline, one end of the fluorine pump (31) and one end of the evaporator (32) are connected with the cooling structure (1), the other end of the evaporator (32) is provided with 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), the water return end of the evaporator (32) is used for being connected with a server, and the second valve (5) is positioned on the pipeline of the water return end of the evaporator (32).

6. A data center refrigeration system according to claim 5, wherein the refrigeration structure (3) further comprises a compressor (33), one end of the compressor (33) being connected to the evaporator (32), the other end of the compressor (33) being connected to the cooling structure (1).

7. A data centre refrigeration system according to claim 6, wherein the refrigeration structure (3) further comprises a third valve (34) and a fourth valve (35), the third valve (34) being connected in parallel to both sides of the fluorine pump (31) to control the communication of the fluorine pump (31) and the evaporator (32); the fourth valve (35) is connected in parallel to both sides of the compressor (33) to control communication between the compressor (33) and the evaporator (32).

8. A data center refrigeration system according to claim 1, characterized in that the cooling structure (1) comprises a condenser (11) and a spray part (12), the condenser (11) is connected with the refrigeration structure (3) and forms a refrigerant cycle, the spray part (12) is arranged below the condenser (11), and the spray part (12) is connected with the heat exchange structure (2) and forms a cooling water cycle.

9. The refrigeration system of claim 8, wherein the cooling structure (1) further comprises a pre-cooling portion (13), the pre-cooling portion (13) is disposed between the spraying portion (12) and the heat exchange structure (2), and the pre-cooling portion (13) is used for pre-cooling water.

10. The liquid cooling device is characterized by comprising a box body and the data center refrigerating system according to any one of claims 1 to 9, wherein the cooling structure (1) is arranged above the box body, and the heat exchange structure (2), the refrigerating structure (3), the first valve (4) and the second valve (5) are all arranged below the box body.