WO2024174538A1

WO2024174538A1 - Heat dissipation system, electronic device, and cabinet

Info

Publication number: WO2024174538A1
Application number: PCT/CN2023/123561
Authority: WO
Inventors: 彭欢; 陈泽鸿; 钟惠婷; 张耀文
Original assignee: 华为技术有限公司
Priority date: 2023-02-20
Filing date: 2023-10-09
Publication date: 2024-08-29
Also published as: CN118524669A

Abstract

A heat dissipation system, an electronic device, and a cabinet. The heat dissipation system comprises an evaporator, a condenser, and a gas-liquid pipeline, and the evaporator is communicated with the condenser by means of the gas-liquid pipeline. The evaporator comprises a first housing, a metal pipe, and a heat dissipation fin assembly. A first cavity is formed in the first housing and used for bearing a refrigerant. A pipe cavity is formed in the metal pipe, the metal pipe comprises a first end and a second end in an extension direction, the first end is an open end, and the second end is a closed end. The first end of the metal pipe is connected to the first housing, and the pipe cavity is communicated with the first cavity. The heat dissipation fin assembly is arranged at the side of the first housing connected to the metal pipe, and the metal pipe passes through the heat dissipation fin assembly, so that the metal pipe is in thermally-conductive connection with a heat dissipation fin. Refrigerant vapor generated in the first cavity can flow into the pipe cavity of the metal pipe, and the refrigerant vapor can be condensed into a refrigerant liquid in the metal pipe. The evaporator has a certain heat dissipation capability, improving the heat dissipation efficiency of the heat dissipation system.

Description

Heat dissipation system, electronic equipment and cabinet

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of the Chinese patent application filed with the Chinese Patent Office on February 20, 2023, with application number 202310187874.1 and application name “A kind of evaporator, condenser, heat dissipation device and electronic device”, all contents of which are incorporated by reference into this application; this application claims the priority of the Chinese patent application filed with the Chinese Patent Office on April 28, 2023, with application number 202310488851.4 and application name “A kind of heat dissipation system, electronic device and cabinet”, all contents of which are incorporated by reference into this application.

Technical Field

The present application relates to the field of heat dissipation technology, and in particular to a heat dissipation system, electronic equipment and a cabinet.

Background Art

As people's demand for computing power gradually increases, the power consumption of chips in information and communication equipment such as servers and switches is increasing, which puts higher requirements on the heat dissipation capacity of the heat sink used to dissipate heat for the chips. In addition, the demand for miniaturization and compactness of equipment limits the space for the heat sink of the chip body, resulting in insufficient heat dissipation area of the heat sink of the chip body. Therefore, the method of using two-phase working fluid to equalize the temperature and bring the heat to a remote space for dissipation has gradually become popular, which is the remote heat dissipation solution.

The gravity loop heat pipe radiator (loop thermosiphon, LTS) is an efficient remote heat dissipation solution. LTS forms a pressure difference through the density difference of the gas-liquid two-phase working fluid to drive the working fluid to circulate inside, and uses the latent heat of the two-phase working fluid to take out the heat emitted by the chip. Usually the structure of LTS includes an evaporator and a condenser. The evaporator is in direct contact with the heat source. After the liquid working fluid is heated, it is transformed into steam under the action of boiling and absorbs the heat of the heat source. After that, the steam moves to the condenser. The condenser is usually in a lower temperature environment, such as in a cold wind, cold water, etc. The steam is cooled and condensed into a liquid working fluid in the condenser, and the heat absorbed by the vaporization is released to achieve the purpose of remote heat dissipation. The condensed liquid working fluid flows back to the evaporator through the condensate pipe under the action of gravity for the next cycle. The evaporator and condenser involve complex phase changes and two-phase flow problems, so the quality of their structural design is crucial to the final performance of the LTS radiator.

Summary of the invention

The present application provides a heat dissipation system, an electronic device and a cabinet. The evaporator in the heat dissipation system has heat dissipation capability and good heat dissipation effect, thereby improving the heat dissipation efficiency of the heat dissipation system.

In a first aspect, the present application provides a heat dissipation system, which includes an evaporator, a condenser, and a gas-liquid pipeline. The evaporator and the condenser are connected through the gas-liquid pipeline, and the refrigerant circulates between the evaporator and the condenser, absorbs the heat of the heating device in the evaporator, evaporates to generate refrigerant vapor, and the refrigerant vapor flows to the condenser through the gas-liquid pipeline and is condensed into refrigerant liquid, and the refrigerant liquid flows to the evaporator for the next heat dissipation.

The evaporator includes a first shell, a metal tube and a heat dissipation fin assembly. The first shell has a first cavity inside, and the first cavity is used to carry refrigerant. The metal tube has a tube cavity inside, and the metal tube includes a first end and a second end along the extension direction, the first end is an open end, and the second end is a closed end. The first end of the metal tube is connected to the first shell, and the tube cavity is connected to the first cavity. The condensing agent vapor generated in the first cavity can flow into the tube cavity of the metal tube. The heat dissipation fin assembly is arranged on the side of the first shell connected to the metal tube, and the metal tube passes through the heat dissipation fin assembly, so that the metal tube is thermally connected to the heat dissipation fin. The metal tube can dissipate heat through the heat dissipation fin assembly, and the refrigerant vapor in its tube cavity can be condensed into refrigerant liquid in the metal tube. The evaporator in this scheme has a certain heat dissipation capacity, and the heat dissipation effect is good, which improves the heat dissipation efficiency of the entire heat dissipation system.

In a specific technical solution, there is no restriction on the connection method between the metal tube and the first shell, but the metal tube and the first shell must be sealed and the refrigerant vapor will not leak in the gap between the metal tube and the first shell. In a possible technical solution, the first end of the metal tube is welded to the first shell, which has a relatively simple process and a reliable connection, and is not prone to refrigerant vapor leakage.

In another technical solution, the metal tube includes a tube body and an outwardly flared edge connected to each other. The outwardly flared edge is located at the first end of the metal tube, and the outwardly flared edge is welded to the first shell. The outwardly flared edge makes the first end of the metal tube flared in a trumpet shape, and when welded to the first shell, the contact area between the outwardly flared edge and the first shell can be larger, which is conducive to improving the connection reliability between the metal tube and the first shell.

Specifically, when the flared edge and the first shell are welded, at least two welds are formed between the flared edge and the first shell, and further The connection reliability between the metal tube and the first shell is improved, and the sealing effect between the tube cavity and the first cavity is improved.

In order to improve the heat dissipation effect and capacity of the metal tube, the height of the metal tube along the extension direction is equal to or less than the height of the heat dissipation fin assembly along the extension direction. This solution enables different areas of the metal tube along the extension direction to use the heat dissipation fin assembly to dissipate heat, which can improve the heat dissipation capacity of the metal tube.

The condenser in the above heat dissipation system includes a second shell and two end covers. The second shell is an integrally formed structure, so the second shell itself is not prone to leakage. The second shell has a second cavity inside, and the two ends of the second cavity have openings, and the two end covers are welded to the openings at the two ends of the second shell. The condenser structure in this solution is relatively simple and is not prone to leakage.

In a further technical solution, the end cover includes a cover plate and a raised portion, the cover plate and the raised portion are fixed to each other, and the cover plate and the raised portion can be an integrally formed structure. The raised portion of the end cover extends into the opening, the cover plate is welded to the end of the second shell, and the raised portion is welded to the inner wall of the second shell toward the second cavity. In this solution, two welds can also be realized, and the connection surface between the cover plate and the second shell and the connection surface between the raised portion and the inner wall of the second shell are at a certain angle, which is conducive to further improving the sealing effect.

In order to improve the structural strength of the condenser, the second cavity of the condenser has at least one reinforcing rib, and the extending direction of the reinforcing rib is the same as the extending direction of the second cavity, which is conducive to forming the second shell and the reinforcing rib by a one-time molding process.

In another technical solution, the condenser includes a first sheet metal cover and a second sheet metal cover. The first sheet metal cover has a bending portion, and the bending portion includes a first part and a second part that are connected to each other. Specifically, the bending portion can be directly formed by a sheet metal process. The first part and the second part are at a set angle, for example, a 90° angle. The second sheet metal cover has a connecting portion, which extends between the first part and the second part of the bending portion. When realizing the connection between the first sheet metal cover and the second sheet metal cover, a welding process can be used. Specifically, the first part of the bending portion can be welded to the first surface of the connecting portion, and the second part of the bending portion can be welded to the second surface of the connecting portion. In this solution, the connection is realized by using two connecting surfaces that are at a preset angle to each other, which is conducive to improving the connection strength between the first sheet metal cover and the second sheet metal cover, and the condenser is not prone to leakage.

In a further technical solution, the second sheet metal cover plate has a convex structure. The convex structure protrudes toward the first sheet metal cover plate, and the convex structure is welded to the first sheet metal cover plate. In this solution, the convex structure can support the first sheet metal cover plate and the second sheet metal cover plate, so that the condenser is not easily deformed when squeezed. In addition, the convex structure is welded to the first sheet metal cover plate, which can improve the connection strength between the first sheet metal cover plate and the second sheet metal cover plate.

In a second aspect, the present application further provides an electronic device, which includes the heat dissipation system and a heating device according to the first aspect. The evaporator of the heat dissipation system is thermally connected to the heating device, and the heat dissipation system can be used to dissipate heat for the heating device. The evaporator has a certain heat dissipation capacity, and the heat dissipation capacity of the heat dissipation system is also relatively strong, which is conducive to improving the heat dissipation effect of the heating device and the power level of the electronic device.

In a third aspect, the present application further provides a cabinet, the cabinet comprising a cabinet body and the electronic device of the second aspect, wherein the electronic device is arranged in the cabinet body. The heat dissipation capacity of the heat dissipation system in the cabinet is strong, which is conducive to improving the power integration of the cabinet.

In a fourth aspect, the present application also provides an evaporator, which includes a first shell, a metal tube and a heat dissipation fin assembly. Among them, the first shell has a first cavity inside, and the first cavity is used to carry refrigerant. The metal tube has a tube cavity inside, and the metal tube includes a first end and a second end along the extension direction, the first end is an open end, and the second end is a closed end. The first end of the metal tube is connected to the first shell, and the tube cavity is connected to the first cavity. The condenser vapor generated in the first cavity can flow into the tube cavity of the metal tube. The heat dissipation fin assembly is arranged on the side of the first shell connected to the metal tube, and the metal tube passes through the heat dissipation fin assembly, so that the metal tube is thermally connected to the heat dissipation fin. Then the metal tube can dissipate heat through the heat dissipation fin assembly, and the refrigerant vapor in its tube cavity can be condensed into refrigerant liquid in the metal tube. The evaporator in this scheme has a certain heat dissipation capacity and a good heat dissipation effect.

Specifically, when welding the flared edge and the first shell, at least two welds are formed between the flared edge and the first shell, which can further improve the connection reliability between the metal tube and the first shell and improve the sealing effect between the tube cavity and the first cavity.

In a fifth aspect, the present application also provides a condenser, which includes a second shell and two end covers. Wherein, the second shell is an integrally formed structure, so the second shell itself is not prone to leakage. The second shell has a second cavity inside, and the two ends of the second cavity have openings respectively, and the two end covers are welded to the openings at the two ends of the second shell respectively. The condenser structure in this solution is relatively simple and is not prone to leakage.

In a sixth aspect, the present application also provides another condenser, the condenser comprising a first sheet metal cover plate and a second sheet metal cover plate. The first sheet metal cover plate has a bending portion, the bending portion comprising a first part and a second part connected to each other, and the bending portion can be directly formed by a sheet metal process. The first part and the second part are at a set angle, for example, a 90° angle. The second sheet metal cover plate has a connecting portion, which extends between the first part and the second part of the bending portion. When realizing the connection between the first sheet metal cover plate and the second sheet metal cover plate, a welding process can be used. Specifically, the first part of the bending portion can be welded to the first surface of the connecting portion, and the second part of the bending portion can be welded to the second surface of the connecting portion. In this solution, the connection is realized by using two connecting surfaces at a preset angle to each other, which is conducive to improving the connection strength between the first sheet metal cover plate and the second sheet metal cover plate, and the condenser is not prone to leakage.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a structure of an electronic device in the present application;

FIG2 is a schematic diagram of a structure of a heat dissipation system in the present application;

FIG3 is a schematic cross-sectional structure diagram of an evaporator in the present application;

FIG4 is an enlarged view of the local structure in FIG3;

FIG5 is a schematic diagram of a structure of a condenser in the present application;

FIG6 is a partial cross-sectional view of a condenser in the present application;

FIG7 is a perspective structural diagram of a condenser in the present application;

FIG8 is another schematic diagram of the structure of the condenser in the present application;

FIG. 9 is a partial cross-sectional view of the condenser in the present application.

Reference numerals:
1-heating device; 2-heat dissipation system; 21-evaporator; 211-first shell;
2111-first wall; 2112-second wall; 212-metal tube; 2121-first end;
2122-second end; 2123-tube body; 2124-outward edge; 213-heat dissipation fin assembly;
22-condenser; 221-second shell; 222-end cover; 2221-cover plate;
2222-protrusion; 223-reinforcement rib; 224-first sheet metal cover; 2241-bending portion;
2241a-first part; 2241b-second part; 225-second sheet metal cover; 2251-connecting part;
2251a-first surface; 2251b-second surface; 2252-convex hull structure; 23-gas-liquid pipeline;
3-circuit board; Z-first direction; Y-second direction.

DETAILED DESCRIPTION

In order to facilitate understanding of the heat dissipation system, electronic equipment and cabinet provided by the present application, the following first introduces its application scenarios. The heat dissipation system provided by the present application is mainly used in the heat dissipation field of the information and communications technology industry (information and communications technology, ICT) or the automotive industry. For example, the present application provides a cabinet, which may include a cabinet body and electronic equipment, the above-mentioned electronic equipment is arranged in the cabinet body, and the electronic equipment has a heating device.

In a specific implementation, the above-mentioned cabinet can be a computing device (such as a server), a network device (such as a switch) or a storage device (such as a storage array) and other devices with high-power consumption devices, or the above-mentioned electronic device can also be located in a vehicle-mounted device.

FIG1 is a schematic diagram of a structure of an electronic device in the present application. As shown in FIG1 , the present application also provides an electronic device. The electronic device includes a heating device 1 and a heat dissipation system 2. The heating device 1 can be specifically located on a circuit board 3, such as forming a node of a server, etc. The heat dissipation system 2 can specifically be a gravity loop heat pipe radiator. The heat dissipation system 2 is thermally connected to the heating device 1 for dissipating heat for the heating device 1.

FIG2 is a schematic diagram of the structure of the heat dissipation system in the present application. As shown in FIG2 , the heat dissipation system 2 includes an evaporator 21, a condenser 22 and a gas-liquid pipeline 23. The evaporator 21 and the condenser 22 are connected through the gas-liquid pipeline 23, and the refrigerant circulates between the evaporator 21 and the condenser 22 through the gas-liquid pipeline 23. Specifically, the gas-liquid pipeline 23 includes a gas pipeline and a liquid pipeline. The gas pipeline connects the gas outlet of the evaporator 21 and the gas inlet of the condenser 22, so that the refrigerant vapor flows from the evaporator 21 to the condenser 22, and condenses into a refrigerant liquid in the condenser 22. The above-mentioned liquid pipeline connects the liquid outlet of the condenser 22 and the liquid inlet of the evaporator 21, and the refrigerant liquid flows from the condenser 22 to the evaporator 21. During specific operation, the evaporator 21 is installed in the electronic device and is thermally connected to the heating device 1. The refrigerant liquid exchanges heat with the heating device 1 in the evaporator 21 and evaporates into refrigerant vapor, thereby taking away the heat generated by the heating device 1 and achieving heat dissipation of the heating device 1; the refrigerant vapor flows along the gas pipeline to the condenser 22 for condensation to form a refrigerant liquid, and the refrigerant liquid then flows along the liquid pipeline to the evaporator 21 to perform the next heat dissipation process for the heating device 1, thereby forming a refrigerant cycle in the heat dissipation system 2. Therefore, the heat dissipation system 2 can take away the heat generated by the heating device 1, thereby dissipating the heat for the heating device 1 and achieving the heat dissipation function of the heat dissipation system 2.

FIG3 is a schematic diagram of a cross-sectional structure of the evaporator in the present application. Please refer to FIG2 and FIG3. The evaporator 21 includes a first shell 211, a metal tube 212 and a heat dissipation fin assembly 213. Specifically, the evaporator 21 may include a plurality of metal tubes 212. Among them, the first shell 211 has a first cavity inside, and the refrigerant flows in the first cavity. The first shell 211 includes a first wall 2111 and a second wall 2112, and the first wall 2111 and the second wall 2112 are located on opposite sides of the first cavity. The first wall 2111 can be considered as a heat source contact surface. When the evaporator 21 is actually used, the first wall 2111 is thermally connected to the heating device 1, thereby exchanging heat with the heating device 1. The second wall 2112 is located on the side of the evaporator 21 away from the heating device 1. The metal tube 212 has a tube cavity inside. The metal tube 212 extends along the first direction Z, and the two ends along the first direction Z are respectively a first end 2121 and a second end 2122. The first end 2121 of the metal tube 212 is an open end having an opening connected to the tube cavity, and the second end 2122 is a closed end, so the metal tube 212 is equivalent to forming a blind tube. The first end 2121 of the metal tube 212 is connected to the first shell 211, and the tube cavity of the metal tube 212 is connected to the first cavity. The heat sink fin assembly 213 is arranged on the side of the first shell 211 connected to the metal tube 212. Specifically, the heat sink fin assembly 213 includes a plurality of heat sink fins. Each heat sink fin includes a through hole, and the metal tube 212 passes through the above-mentioned through hole of the heat sink fin assembly 213 and is thermally connected to the heat sink fin.

When the evaporator 21 in the present application is working, there is a refrigerant in the first cavity, and the first wall 2111 is thermally connected to the heating device 1. The refrigerant absorbs the heat of the heating device 1 and vaporizes to form steam, and a part of the steam rises to the metal tube 212; and the metal tube 212 is thermally connected to the heat dissipation fin assembly 213, so the heat dissipation fin assembly 213 improves the heat exchange efficiency of the metal tube 212, so that the steam condenses in the metal tube 212 to form a liquid condensing agent, and flows back to the first cavity to participate in the next process of heat dissipation for the heating device 1. Another part of the steam flows to the condenser 22 through the gas-liquid pipeline 23, and the refrigerant vapor is condensed by the condenser 22 to form a refrigerant liquid. The evaporator 21 in this solution itself has a certain heat dissipation capacity, which can improve the heat dissipation capacity and heat dissipation efficiency of the heat dissipation system 2, thereby adapting to the situation where the heat dissipation demand of the heating device 1 is getting higher and higher.

In a specific implementation, the number and arrangement positions of the metal tubes 212 included in the evaporator 21 are not limited, and can be specifically designed according to the heat dissipation requirements of the heating device 1. For example, thermal test simulation data of the heat conduction effect of different regions of the evaporator 21 can be obtained by simulation, and then the arrangement position and number of the metal tubes 212 with the best heat dissipation effect can be selected.

3 , when the metal tube 212 is connected to the first shell 211, the first end 2121 of the metal tube 212 can be welded to the first shell 211. In this implementation, the connection process between the metal tube 212 and the first shell 211 is relatively simple, which is conducive to simplifying the manufacturing process of the evaporator 21.

FIG4 is an enlarged view of the local structure in FIG3. Please refer to FIG3 and FIG4 to see that the metal tube 212 includes a tube body 2123 and an outward edge 2124 connected to each other. Specifically, the outward edge 2124 is located at the first end 2121 of the metal tube 212, so that the opening of the metal tube 212 forms a trumpet shape. The outward edge 2124 is welded to the first shell 211. Since the contact area between the outward edge 2124 and the first shell 211 can be larger, the connection strength between the metal tube 212 and the first shell 211 can be improved.

Specifically, when the metal tube 212 is welded to the first shell 211, at least two welds may be formed between the outer edge 2124 and the first shell 211. In this implementation, the metal tube 212 and the first shell 211 are connected by multiple welds, which can further improve the connection strength between the metal tube 212 and the first shell 211.

The present application does not limit the material of the metal tube 212. For example, in a possible implementation, the metal tube 212 may be a copper tube, an aluminum tube, or a stainless steel tube. The metal tube 212 made of the above materials has good thermal conductivity, is relatively stable, and is not easily corroded.

The height of the metal tube 212 along the extension direction is equal to or less than the height of the heat sink fin assembly 213 along the extension direction of the metal tube 212. The extension direction of the metal tube 212 can be fully connected to the heat sink fin assembly 213 for heat dissipation to improve the heat dissipation capacity of the metal tube 212.

FIG5 is a schematic diagram of a structure of a condenser in the present application. As shown in FIG5 , the condenser 22 includes a second shell 221 and two end covers 222. The second shell 221 is an integrally formed structure, and specifically, the second shell 221 can be formed by a profile extrusion process. The second shell 221 extends along the second direction Y, and has openings at both ends of the second direction Y, respectively, and the two end covers 222 are welded to the openings at both ends of the second shell 221, respectively. In this implementation, the second shell 221 is an integral structure, so that the condenser 22 has fewer connecting parts, the condenser 22 has better structural strength, is not prone to leakage, etc., and the assembly process is relatively simple, and the cost is low.

FIG6 is a partial cross-sectional view of the condenser in the present application. As shown in FIG6, in a specific implementation, the end cover 222 includes a cover plate 2221 and a protrusion 2222, and the protrusion 2222 is fixed to the cover plate 2221. In a specific implementation, the cover plate 2221 and the protrusion 2222 are an integrally formed structure, and the reliability of the connection between the cover plate 2221 and the protrusion 2222 is relatively strong. In a specific implementation, the outer contour of the circumferential side of the protrusion 2222 can be matched with the contour of the opening of the second cavity, so that the protrusion 2222 forms a better connection relationship with the inner wall of the second shell 221. When the cover plate 2221 is installed to the second shell 221, the protrusion 2222 extends into the opening of the second shell 221. The cover plate 2221 contacts the end of the second shell 221 to form a mounting surface, which can specifically form a weld. The raised portion 2222 contacts the inner wall of the second shell 221 facing the second cavity to form another mounting surface, specifically another welding seam. This solution can improve the connection strength between the end cover 222 and the second shell 221.

The protrusion 2222 extends out of the second cavity of the second shell 221 , and can also support the second shell 221 , thereby improving the strength of the second shell 221 .

FIG7 is a perspective structural diagram of the condenser in the present application. As shown in FIG7 , in a specific implementation, at least one reinforcing rib 223 is provided in the second cavity to enhance the structural strength of the condenser 22. The extending direction of the reinforcing rib 223 is the same as the extending direction of the second cavity, and specifically can extend from one opening of the second shell 221 to another opening. In this solution, the reinforcing rib 223 and the second shell 221 can be an integrally formed structure, which can simplify the preparation process of the condenser 22 on the one hand, and improve the connection strength between the reinforcing rib 223 and the second shell 221 on the other hand.

FIG8 is another structural schematic diagram of the condenser in the present application. As shown in FIG8 , in another implementation, the condenser 22 includes a first sheet metal cover plate 224 and a second sheet metal cover plate 225, which are welded to form a third cavity between the first sheet metal cover plate 224 and the second sheet metal cover plate 225. In this implementation, the second sheet metal cover plate 225 and the first sheet metal cover plate 224 can be formed separately by using a sheet metal process, so that the first sheet metal cover plate 224 and the second sheet metal cover plate 225 are not prone to leakage; and then the second sheet metal cover plate 225 and the first sheet metal cover plate 224 are welded by a welding process, so that the second sheet metal cover plate 225 and the first sheet metal cover plate 224 are reliably connected.

FIG9 is a partial cross-sectional view of the condenser in the present application. As shown in FIG9 , in order to improve the connection strength between the first sheet metal cover plate 224 and the second sheet metal cover plate 225, the first sheet metal cover plate 224 may have a bending portion 2241. The bending portion 2241 includes a first portion 2241a and a second portion 2241b connected to each other, and the first portion 2241a and the second portion 2241b are at a set angle. Specifically, the first portion 2241a and the second portion 2241b may be arranged vertically. The second sheet metal cover plate 225 has a connecting portion 2251 connected to the first sheet metal cover plate 224, the connecting portion 2251 extends into the bending portion 2241, and the connecting portion 2251 includes a first surface 2251a and a second surface 2251b, and the angle between the first surface 2251a and the second surface 2251b is consistent with the set angle between the first portion 2241a and the second portion 2241b of the bending portion 2241. The first part 2241a is welded to the first surface 2251a of the connecting part 2251, and the second part 2241b is welded to the second surface 2251b of the connecting part 2251. In this solution, there are two interconnected connecting surfaces between the first sheet metal cover plate 224 and the second sheet metal cover plate 225, which can improve the connection strength between the first sheet metal cover plate 224 and the second sheet metal cover plate 225 and improve the sealing of the third cavity.

In a further implementation, the second sheet metal cover plate 225 has a convex structure 2252, and the convex structure 2252 protrudes toward the first sheet metal cover plate 224, that is, the convex structure 2252 in the first sheet metal cover plate 224 protrudes toward the third cavity. The convex structure 2252 is welded to the first sheet metal cover plate 224, which can further improve the connection strength between the first sheet metal cover plate 224 and the second sheet metal cover plate 225, and improve the sealing of the third cavity.

In a specific implementation, the convex structure 2252 can be formed by a sheet metal process, so that the second sheet metal cover 225 itself is an integrated sheet metal structure, which simplifies the preparation process on the one hand, and improves the sealing of the third cavity of the condenser 22 on the other hand.

The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

A heat dissipation system, characterized in that it comprises an evaporator, a condenser and a gas-liquid pipeline, wherein the evaporator and the condenser are connected through the gas-liquid pipeline, wherein:

The evaporator includes a first shell, a metal tube and a heat dissipation fin assembly, wherein the first shell has a first cavity inside, the metal tube has a tube cavity inside, the metal tube includes a first end and a second end, the first end is an open end, and the second end is a closed end; the first end of the metal tube is connected to the first shell, and the tube cavity is connected to the first cavity; the heat dissipation fin assembly is arranged on a side of the first shell connected to the metal tube, and the metal tube passes through the heat dissipation fin assembly and is thermally connected to the heat dissipation fin assembly.
The heat dissipation system according to claim 1, characterized in that the first end of the metal tube is welded to the first shell.
The heat dissipation system as described in claim 2 is characterized in that the metal tube includes a tube body portion and a flared edge connected to each other, the flared edge is located at the first end of the metal tube, and the flared edge is welded to the first shell.
The heat dissipation system as described in claim 3 is characterized in that there are at least two welds between the flared edge and the first shell.
The heat dissipation system according to any one of claims 1 to 4, characterized in that a height of the metal tube along the extension direction is equal to or less than a height of the heat dissipation fin assembly along the extension direction.
The heat dissipation system according to any one of claims 1 to 5, characterized in that the condenser comprises a second shell and two end covers, wherein:

The second shell is an integrally formed structure, and the second shell has a second cavity inside, both ends of the second cavity have openings respectively, and the two end covers are respectively welded to the openings at both ends of the second shell.
The heat dissipation system as described in claim 6 is characterized in that the end cover has a cover plate and a protrusion fixed to the cover plate, the protrusion extends into the opening, the cover plate is welded to the end of the second shell, and the protrusion is welded to the inner wall of the second shell toward the second cavity.
The heat dissipation system according to claim 6 or 7 is characterized in that the second cavity has at least one reinforcing rib, and the extension direction of the reinforcing rib is the same as the extension direction of the second cavity.
The heat dissipation system according to any one of claims 1 to 5, characterized in that the condenser comprises a first sheet metal cover plate and a second sheet metal cover plate, wherein:

The first sheet metal cover has a bending portion, which includes a first part and a second part that are connected to each other, and the first part and the second part are at a set angle; the connecting portion of the second sheet metal cover extends into the bending portion, the first part is welded to the first surface of the connecting portion, and the second part is welded to the second surface of the connecting portion.
The heat dissipation system as described in claim 9 is characterized in that the second sheet metal cover has a convex structure, the convex structure protrudes toward the first sheet metal cover, and the convex structure is welded to the first sheet metal cover.
An electronic device, characterized in that it comprises the heat dissipation system according to any one of claims 1 to 10, and further comprises a heating device, wherein the evaporator is thermally connected to the heating device.
A cabinet, characterized in that it comprises a cabinet body and the electronic device according to claim 11, wherein the electronic device is arranged in the cabinet body.