Liquid cooling distribution device and immersed server cabinet

Abstract

The invention relates to the technical field of server cabinets, in particular to a liquid cooling distribution device and an immersed server cabinet. The liquid cooling distribution device comprises a liquid inlet pipe and a liquid return pipe, a plurality of branch pipe liquid inlets are formed in the liquid inlet pipe, and a plurality of branch pipe liquid return openings are formed in the liquid return pipe; and a plurality of separation blades are arranged in the liquid return pipe, and are positioned above the liquid return ports of the branch pipes corresponding to the separation blades. The liquid cooling distribution device is arranged outside the server cabinet and is connected to the branch pipe liquid inlets and the branch pipe liquid return ports through the corresponding communicating pipes, so that cooling liquid can be introduced into the server for heat dissipation and cooling, and the server cabinet can be conveniently overhauled and maintained. The self-closing connector assemblies and the built-in one-way valves are additionally arranged on the branch pipe liquid inlets and the branch pipe liquid return ports respectively, so that multiple sets of communicating pipes can be adjusted and arranged again according to the number of the server units, and universality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of server cabinets, and more particularly to a liquid cooling distribution device and an immersed server cabinet. Background Art

[0002] my country's demand for high-computing power businesses such as computing nodes, AI training, and ultra-high computing continues to push for the continuous improvement of chip performance, power, and server power. As the scale of data center construction continues to increase, the density of server cabinets increases. Traditional air cooling technology has become increasingly unable to meet the heat dissipation needs of IT equipment. Liquid cooling technology uses the higher specific heat capacity and heat exchange capacity of liquid to support higher power heat dissipation, and is gradually becoming a new type of refrigeration demand.

[0003] Liquid cooling technology mainly includes cold plate liquid cooling, immersion liquid cooling and spray liquid cooling. Cold plate liquid cooling is a method in which the heat of high-heat generating components such as server chips is indirectly transferred to the liquid through a cold plate for heat dissipation, while low-heat generating components are still cooled by air cooling. Immersion liquid cooling is a method in which the server is completely immersed in the coolant, and the heat of all the heat generating components is directly transferred to the coolant, and the heat is dissipated through the circulation of the coolant or the evaporation and condensation phase change. Among them, the circulation of the coolant is single-phase immersion liquid cooling, and the evaporation and condensation phase change of the coolant is phase change immersion liquid cooling.

[0004] Single-phase immersion liquid-cooled server cabinets currently mainly include two types: TANK cabinets and rack-mounted server cabinets. The liquid cooling pipeline layout involved in the rack-mounted server cabinet currently has the following problems: the liquid cooling pipeline design is complex and difficult to maintain. The specific pipeline design needs to be readjusted according to the number of server units, which lacks versatility. At the same time, the coolant needs to perform more cumbersome flow adjustment work according to the number of server units. Summary of the invention

[0005] In view of the deficiencies in the prior art, an object of the present invention is to provide a liquid cooling distribution device to solve at least one technical problem existing in the above-mentioned background technology.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: The liquid cooling distribution device comprises a liquid inlet pipe for receiving the cooling liquid provided by the circulating liquid supply device, and a liquid return pipe for receiving the cooling liquid transported by the liquid inlet pipe and returning the cooling liquid to the circulating liquid supply device; the liquid inlet pipe is provided with a plurality of branch pipe liquid inlets for transporting the cooling liquid to the servers in the server cabinet, and the liquid return pipe is provided with a plurality of branch pipe liquid return ports corresponding to the branch pipe liquid inlets one by one and used for introducing the cooling liquid overflowing from the servers into the liquid return pipe; the lower end of the liquid inlet pipe is provided with a liquid inlet for receiving the cooling liquid provided by the circulating liquid supply device, and the lower end of the liquid return pipe is provided with a liquid return port for returning the cooling liquid to the circulating liquid supply device; the upper end of the liquid inlet pipe is provided with a connecting pipeline for adjusting the pressure of the cooling liquid in the liquid inlet pipe, the liquid inlet end of the connecting pipeline is connected with the upper end of the liquid inlet pipe, and the liquid outlet end of the connecting pipeline is connected with the upper end of the liquid return pipe; The connecting pipeline includes a connecting pipe, a control ball valve and a one-way valve; the liquid inlet end of the one-way valve is connected to the upper end of the liquid inlet pipe, and its liquid outlet end is connected to the liquid inlet end of the control ball valve; the liquid inlet end of the connecting pipe is connected to the liquid outlet end of the control ball valve, and its liquid outlet end is connected to the upper end of the return liquid pipe.

[0007] Optionally, a plurality of branch pipe liquid inlets are arranged at equal intervals along the length direction of the liquid inlet pipe, and a plurality of branch pipe liquid return ports are arranged at equal intervals along the length direction of the liquid return pipe, and the branch pipe liquid return ports are located below the corresponding branch pipe liquid inlets.

[0008] Optionally, a plurality of baffle blades are provided in the liquid return pipe, corresponding one-to-one to the branch pipe return liquid ports and used to guide the coolant from top to bottom in the liquid return pipe so that the coolant does not directly pass through the branch pipe return liquid ports, and the baffle blades are located above the corresponding branch pipe return liquid ports.

[0009] Optionally, a plurality of inner liquid return holes corresponding to the baffle leaves one by one are formed between the baffle leaves from top to bottom and the liquid return pipe, and the cross-sectional areas of the plurality of inner liquid return holes from top to bottom are the same or decrease step by step.

[0010] Optionally, a baffle fixing bracket is provided in the liquid return pipe, and a plurality of baffle leaves are arranged on the baffle fixing bracket at equal intervals.

[0011] Optionally, the liquid inlet pipe and the liquid return pipe are arranged in parallel and integrated; the lower end of the liquid inlet pipe is provided with a liquid inlet port for receiving the coolant provided by the circulating liquid supply device, and the lower end of the liquid return pipe is provided with a liquid return port for returning the coolant to the circulating liquid supply device; the upper end of the liquid inlet pipe is provided with a connecting pipeline for adjusting the pressure of the coolant in the liquid inlet pipe, the liquid inlet end of the connecting pipeline is connected with the upper end of the liquid inlet pipe, and the liquid outlet end of the connecting pipeline is connected with the upper end of the liquid return pipe.

[0012] Optionally, the connecting pipeline includes a connecting pipe, a control ball valve and a one-way valve; the liquid inlet end of the one-way valve is connected to the upper end of the liquid inlet pipe, and its liquid outlet end is connected to the liquid inlet end of the control ball valve; the liquid inlet end of the connecting pipe is connected to the liquid outlet end of the control ball valve, and its liquid outlet end is connected to the upper end of the return pipe.

[0013] Optionally, a self-closing joint assembly for quick connection or disassembly with the connecting pipe is provided on the liquid inlet of the branch pipe.

[0014] Optionally, an anti-seepage joint for connecting with the connecting pipe is provided on the liquid return port of the branch pipe.

[0015] Optionally, a primary sealing ring and a secondary sealing ring are provided at one end of the anti-seepage joint close to the liquid return pipe.

[0016] Optionally, a plurality of hanging ears are provided on the liquid inlet pipe or the liquid return pipe.

[0017] Another object of the present invention is to provide an immersed server cabinet, which includes the aforementioned liquid cooling distribution device.

[0018] In summary, the present invention has the following beneficial effects: the liquid cooling distribution device of the present invention is arranged outside the server cabinet, and the corresponding connecting pipe is connected to the branch pipe liquid inlet and the branch pipe liquid return port to introduce coolant into the server for heat dissipation and cooling, thereby facilitating the inspection and maintenance of the server cabinet. By respectively installing a self-closing joint assembly and a one-way valve on the branch pipe liquid inlet and the branch pipe liquid return port, multiple groups of connecting pipes can be readjusted and arranged according to the number of server units, thereby improving versatility. Providing a connecting pipeline between the liquid inlet pipe and the liquid return pipe can realize the exhaust of the liquid inlet cavity in the liquid inlet pipe, and the liquid inlet cavity pressure and the coolant flow rate can be adjusted according to the number of cabinet server units, thereby balancing the relative stability of the coolant flow of other server units in the cabinet at the cabinet level, simplifying the overall data center coolant flow regulation work. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a perspective view of the present invention; Figure 2 It is a schematic diagram of the structure of the present invention; Figure 3 yes Figure 2 The main view; Figure 4 yes Figure 3 Cutaway view at section AA; Figure 5 is an exploded view of the present invention; Figure 6 yes Figure 4 Enlarged view of area B; Figure 7 yes Figure 5 Enlarged view of the middle C area; Figure 8 is a flow diagram of the coolant inside the present invention; Fig. 9 is a schematic diagram of the connection between the present invention and an immersion server cabinet; Fig.10 It is a front view of the anti-seepage joint of the present invention; Fig.11 yes Fig.10 Cutaway view at section DD. DETAILED DESCRIPTION

[0020] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings. Several embodiments of the present invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0022] In the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. The terms "vertical", "horizontal", "left", "right", "above", "below" and similar expressions are for illustrative purposes only, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0023] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] The present invention provides a liquid cooling distribution device, such as Figure 1-9As shown, it includes a liquid inlet pipe 1 for receiving the coolant provided by the circulating liquid supply device, and a liquid return pipe 2 for receiving the coolant transported by the liquid inlet pipe 1 and returning the coolant to the circulating liquid supply device; the liquid inlet pipe 1 is provided with a plurality of branch pipe liquid inlets 11 for transporting the coolant to the server 7 in the server cabinet, and the liquid return pipe 2 is provided with a plurality of branch pipe liquid return ports 21 corresponding to the branch pipe liquid inlets 11 and used for introducing the coolant overflowing from the server 7 into the liquid return pipe 2; the lower end of the liquid inlet pipe 1 is provided with a liquid inlet 12 for receiving the coolant provided by the circulating liquid supply device, and the lower end of the liquid return pipe 2 is provided with a liquid return port 22 for returning the coolant to the circulating liquid supply device; the upper end of the liquid inlet pipe 1 is provided with a pressure regulating valve for adjusting the coolant in the liquid inlet pipe 1 The connecting pipeline 4 of the force, the liquid inlet end of the connecting pipeline 4 is connected with the upper end of the liquid inlet pipe 1, and the liquid outlet end of the connecting pipeline 4 is connected with the upper end of the return liquid pipe 2; the connecting pipeline 4 includes a connecting pipe 41, a control ball valve 42 and a one-way valve 43; the liquid inlet end of the one-way valve 43 is connected with the upper end of the liquid inlet pipe 1, and its liquid outlet end is connected with the liquid inlet end of the control ball valve 42; the liquid inlet end of the connecting pipe 41 is connected with the liquid outlet end of the control ball valve 42, and its liquid outlet end is connected with the upper end of the return liquid pipe 2. The return liquid pipe 2 is provided with a plurality of baffle leaves 31 corresponding to the branch pipe return liquid ports 21 one by one and used to guide the coolant from top to bottom in the return liquid pipe 2 so that the coolant does not directly pass through the branch pipe return liquid port 21, and the baffle leaves 31 are located above the corresponding branch pipe return liquid port 21.

[0025] In this embodiment, the liquid inlet pipe 1 and the liquid return pipe 2 are vertically installed in the server cabinet through the hanging ears 5. The circulating liquid supply device is located inside and outside the server cabinet to provide circulation power for the coolant. The coolant enters the liquid inlet pipe 1 from bottom to top, and then enters the server 7 through the branch pipe liquid inlet 11 and the connecting pipe 6 in turn for heat exchange, and then overflows into the liquid return pipe 2 through another connecting pipe 6 and the branch pipe liquid return port 21 in turn, and then flows back to the circulating liquid supply device from top to bottom in the liquid return pipe 2. The number of branch pipe liquid inlets 11 and the number of branch pipe liquid return ports 21 correspond one to one, and are equal to the number of servers 7 in the server cabinet. Figure 1 The number of branch pipe liquid inlets 11 shown in the figure is four, which can be set as needed in other embodiments.

[0026] The above technical solution can provide corresponding connecting pipes 6 connected to the branch pipe liquid inlet 11 and the branch pipe liquid return port 21 to pass cooling liquid into the server 7 for heat dissipation and cooling, thereby facilitating the inspection and maintenance of the server cabinet.

[0027] like Figure 1-7As shown, the top of the liquid inlet chamber is connected to the top of the liquid return chamber through the connecting pipe 4, and the one-way valve 43 and the control ball valve 42 in the connecting pipe 4 work together to exhaust the liquid inlet chamber and adjust the coolant pressure in the liquid inlet chamber. When the liquid cooling pipeline is first filled with liquid, there is air in the liquid inlet chamber, and the coolant fills the liquid inlet chamber from bottom to top through the liquid inlet 12 at the bottom of the liquid inlet chamber. The air and part of the coolant enter the liquid return chamber through the one-way valve 43, the control ball valve 42, and the connecting pipe 41 in turn to complete the exhaust of the liquid inlet chamber. Furthermore, a plurality of branch pipe liquid inlets 11 are arranged at equal intervals along the length direction of the liquid inlet pipe 1, and a plurality of branch pipe liquid return ports 21 are arranged at equal intervals along the length direction of the liquid return pipe 2, and the branch pipe liquid return ports 21 are located below the corresponding branch pipe liquid inlets 11.

[0028] like Figure 1 As shown, four branch pipe liquid inlets 11 are evenly spaced apart on the side of the liquid inlet pipe 1, and the height of the intervals corresponds to the height of the upper and lower adjacent servers 7. Four branch pipe liquid return ports 21 are evenly spaced apart on the side of the liquid return pipe 2, and the height of the intervals corresponds to the height of the upper and lower adjacent servers 7. The branch pipe liquid return ports 21 are located below the corresponding branch pipe liquid inlet 11, and the baffle leaf 31 is located between the corresponding branch pipe liquid inlet 11 and the corresponding branch pipe liquid return port 21. The equal spacing of the branch pipe liquid inlet 11 and the branch pipe liquid return port 21 is conducive to balancing the pressure of the coolant flowing into the upper and lower servers 7.

[0029] Furthermore, a plurality of baffle blades 31 are provided in the liquid return pipe 2, which correspond one-to-one with the branch pipe liquid return ports 21 and are used to guide the coolant from top to bottom in the liquid return pipe 2 so that the coolant does not directly pass through the branch pipe liquid return ports 21. The baffle blades 31 are located above the corresponding branch pipe liquid return ports 21.

[0030] In actual applications, the branch pipe liquid return port 21 at the bottom of the server cabinet (the lower part of the server cabinet) will be affected by the gravity and water tension of the reflux liquid at the upper part (the upper part) in the liquid return chamber, causing blockage, resulting in a decrease in the liquid return efficiency of the branch pipe liquid return port 21 at the lower layer (that is, the liquid return efficiency of the branch pipe liquid return port 21 at the lower layer is lower than the liquid return efficiency of the branch pipe liquid return port 21 at the upper layer). By providing a baffle leaf 31 above the corresponding branch pipe liquid return port 21, the reflux liquid from top to bottom in the liquid return pipe 2 is guided by the baffle leaf 31 and does not directly pass through the branch pipe liquid return port 21, thereby preventing blockage from occurring.

[0031] Furthermore, a plurality of inner liquid return holes 24 corresponding to the baffle blades 31 are formed between the baffle blades 31 from top to bottom and the liquid return pipe 2, and the cross-sectional areas of the plurality of inner liquid return holes 24 from top to bottom are the same or decrease step by step.

[0032] like Figure 6-7As shown, a liquid return hole 24 is formed between the baffle blade 31 and the inner wall of the liquid return pipe 2. The coolant in the liquid return pipe 2 flows from top to bottom through the four liquid return holes 24 in sequence to the bottom of the liquid return pipe 2. The cross-sectional area of ​​all the liquid return holes 24 is the same. In another embodiment, in order to further reduce the influence of the gravity and water tension of the reflux liquid on the branch pipe liquid return port 21, the cross-sectional area of ​​the lower liquid return hole 24 is smaller than that of the upper liquid return hole 24, that is, the distance between the baffle blade 31 and the inner wall of the liquid return pipe 2 ( Figure 6 In another embodiment, in order to further improve the liquid return efficiency, the baffle blade 31 is in the shape of an obtuse angle iron (its cross section is an obtuse angle).

[0033] Furthermore, a baffle fixing bracket 3 is arranged in the liquid return pipe 2 , and a plurality of baffle leaves 31 are arranged on the baffle fixing bracket 3 at equal intervals.

[0034] like Figure 5-7 As shown, in order to facilitate the processing and manufacturing of the liquid cooling distribution device, the baffle blade 31 is welded to the lower baffle fixing bracket 3, and the baffle fixing bracket 3 is attached to the side wall of the liquid return pipe 2.

[0035] Furthermore, the liquid inlet pipe 1 and the liquid return pipe 2 are arranged in parallel and integrated.

[0036] like Figure 1-7 As shown, in order to further facilitate the processing and manufacturing of the liquid cooling distribution device, reduce the processing cost, reduce the device volume and the installation space required for the device, the liquid inlet pipe 1 and the liquid return pipe 2 are arranged in parallel and integrated. Specifically: a baffle is sealed and welded inside a square stainless steel tube, and the internal space of the square stainless steel tube is sealed and divided into a liquid return chamber corresponding to the liquid return pipe 2, and a liquid inlet chamber corresponding to the liquid inlet pipe 1; then the baffle fixing bracket 3 is inserted into the liquid return chamber; a liquid inlet port 12 connected to the liquid inlet chamber and a liquid return port 22 connected to the liquid return chamber are respectively arranged at the bottom end of the square stainless steel tube. A connecting pipe 4 is arranged at the top of the square stainless steel tube, so that one end of the connecting pipe 4 is connected to the liquid inlet chamber, and the other end is connected to the liquid return chamber.

[0037] Furthermore, a self-closing joint assembly 13 for quick connection or disassembly with the connecting pipe 6 is provided on the branch pipe liquid inlet 11 .

[0038] Furthermore, an anti-seepage joint 23 for connecting with the connecting pipe 6 is provided on the branch pipe liquid return port 21 .

[0039] Furthermore, a primary sealing ring 231 and a secondary sealing ring 232 are provided at one end of the anti-seepage joint 23 close to the liquid return pipe 2 .

[0040] like Figure 1-11As shown, when the number of servers 7 in the cabinet is reduced, only the corresponding connecting pipe 6 needs to be removed. The branch pipe liquid inlet 11 adopts a self-closing joint assembly 13, and no leakage occurs. The control ball valve 42 is further adjusted to allow part of the coolant to flow directly into the return liquid chamber through the connecting pipe 4, thereby reducing the pressure in the liquid inlet chamber, and then balancing the hydraulic pressure of the remaining branch pipe liquid inlet 11, so as to achieve a smooth circulation of the coolant in the cabinet. The self-closing joint assembly 13 is a connection device with an automatic closing function, which is a prior art and generally includes an elastic element (such as a spring) and a sealing component (such as a rubber sealing ring). The function of the spring is to provide the power for closing. When the joint is separated, the spring will push the sealing component to quickly close the channel to prevent fluid leakage.

[0041] The connecting pipe 41 can be a U-shaped, C-shaped, or special-shaped connecting bellows that can conduct the cooling liquid. The anti-seepage joint 23 has a double-headed thread, and the primary sealing ring 231 and the secondary sealing ring 232 are respectively sleeved on the thread of one end of the anti-seepage joint 23 close to the liquid return pipe 3. In order to prevent the cooling liquid in the liquid return chamber from leaking to the outside of the device from the branch pipe liquid return port 21, a built-in one-way valve 233 is also provided inside the anti-seepage joint 23. In other embodiments, a self-closing joint assembly 13 can also be used to replace the built-in one-way valve 233 and the anti-seepage joint 23 and be installed on the branch pipe liquid return port 21.

[0042] Furthermore, a plurality of hanging ears 5 are provided on the liquid inlet pipe 1 or the liquid return pipe 2 .

[0043] like Figure 1-7 As shown, a hanging ear 5 is welded on the main body of the liquid cooling pipeline (square stainless steel pipe), which is connected to the frame in the cabinet through the hanging ear 5 and fixed with screw fasteners. The installation is convenient and simple, and the maintenance is convenient.

[0044] In summary, the present invention has the following beneficial effects: the liquid inlet pipe 1 and the liquid return pipe 2 are integrated and fixed in the cabinet directly through the hanging ear 5, the coolant flows into the liquid inlet cavity through the liquid inlet port 12, flows into the immersion server cavity through the branch pipe liquid inlet port 11, and performs heat exchange with the heat generating device. The coolant after heat exchange flows from the server overflow port to the connecting pipe 6 by overflow, and then enters the liquid return cavity in the liquid return pipe 2 through the branch pipe liquid return port 21, and the cooling of the components in the server is achieved through this cycle. When the number of servers 7 in the cabinet changes, the corresponding self-closing joint assembly 13 is not connected to the connecting pipe 6, and the cooling will not leak. Further, the control ball valve 42 in the connecting pipeline 4 is manually adjusted to make the coolant flow from the liquid inlet cavity into the liquid return cavity, thereby achieving pressure regulation in the liquid inlet cavity and balancing the pressure of the remaining branch pipe liquid inlets 11. The baffle leaf 31 in the baffle fixing bracket 3 avoids the problem of blockage of the branch pipe liquid return port 21 caused by the coolant at the connecting pipe 6 and the connecting pipe 41 used for liquid return. In addition, the invention also solves the technical problems that the complex design of the liquid cooling pipeline of the single-phase immersion liquid-cooled rack-mounted server cabinet causes inconvenience in maintenance, and the cooling liquid needs to undergo a relatively cumbersome flow adjustment process according to the number of server units.

[0045] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A liquid cooling distribution device, characterized in that: It includes a liquid inlet pipe for receiving the coolant provided by the circulating liquid supply device, and a liquid return pipe for receiving the coolant transported by the liquid inlet pipe and returning the coolant to the circulating liquid supply device; the liquid inlet pipe is provided with a plurality of branch pipe liquid inlets for transporting the coolant to the server in the server cabinet, and the liquid return pipe is provided with a plurality of branch pipe liquid return ports corresponding to the branch pipe liquid inlets one by one and used to guide the coolant overflowing from the server into the liquid return pipe; the lower end of the liquid inlet pipe is provided with a liquid inlet for receiving the coolant provided by the circulating liquid supply device, and the lower end of the liquid return pipe is provided with a liquid return port for returning the coolant to the circulating liquid supply device; the upper end of the liquid inlet pipe is provided with a connecting pipeline for adjusting the pressure of the coolant in the liquid inlet pipe, the liquid inlet end of the connecting pipeline is connected with the upper end of the liquid inlet pipe, and the liquid outlet end of the connecting pipeline is connected with the upper end of the liquid return pipe; The connecting pipeline includes a connecting pipe, a control ball valve and a one-way valve; the liquid inlet end of the one-way valve is connected to the upper end of the liquid inlet pipe, and its liquid outlet end is connected to the liquid inlet end of the control ball valve; the liquid inlet end of the connecting pipe is connected to the liquid outlet end of the control ball valve, and its liquid outlet end is connected to the upper end of the return liquid pipe.

2. The liquid cooling distribution device according to claim 1, characterized in that: A plurality of branch pipe liquid inlets are arranged at equal intervals along the length direction of the liquid inlet pipe, a plurality of branch pipe liquid return ports are arranged at equal intervals along the length direction of the liquid return pipe, and the branch pipe liquid return ports are located below the corresponding branch pipe liquid inlets.

3. The liquid cooling distribution device according to claim 1, characterized in that: The return pipe is provided with a plurality of baffles which correspond to the branch pipe return ports one by one and are used to guide the coolant from top to bottom in the return pipe so that the coolant does not directly pass through the branch pipe return ports. The baffles are located above the corresponding branch pipe return ports.

4. The liquid cooling distribution device according to claim 3, characterized in that: A plurality of inner liquid return holes corresponding to the baffle leaves one by one are formed between the baffle leaves from top to bottom and the liquid return pipe, and the cross-sectional areas of the plurality of inner liquid return holes from top to bottom are the same or decrease step by step.

5. The liquid cooling distribution device according to claim 3, characterized in that: A baffle fixing bracket is arranged in the liquid return pipe, and a plurality of baffle leaves are arranged on the baffle fixing bracket at equal intervals.

6. The liquid cooling distribution device according to claim 1, characterized in that: The liquid inlet pipe and the liquid return pipe are arranged in parallel and integrated.

7. The liquid cooling distribution device according to claim 1, characterized in that: A self-closing joint assembly for quick connection or disassembly with the connecting pipe is arranged on the liquid inlet of the branch pipe.

8. The liquid cooling distribution device according to claim 1, characterized in that: The branch pipe liquid return port is provided with an anti-seepage joint for connecting with the connecting pipe.

9. The liquid cooling distribution device according to claim 8, characterized in that: The end of the anti-seepage joint close to the liquid return pipe is provided with a primary sealing ring and a secondary sealing ring.

10. The liquid cooling distribution device according to claim 1, characterized in that: A plurality of hanging ears are arranged on the liquid inlet pipe or the liquid return pipe.

11. Immersed server cabinet, characterized in that: Comprising the liquid cooling distribution device according to any one of claims 1 to 10.

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