TWI787749B - Heat dissipation structure, manufacturing method of the heat dissipation structure, and device - Google Patents

Abstract

A heat dissipation structure includes a first housing, a pipe body, a second housing, a first capillary structure and a working fluid. The first housing includes a main body part and a connecting part, the connecting part is on one side of the main body part and is bent and enclosed to form a through hole. The pipe body includes a first end and a second end. The first end is open, and the second end is sealed. The first end connects to the second end to form a cavity, the first end is connected to the connecting portion, and the cavity is connected to the through hole. The second housing is connected to the first housing and the pipe body to form a sealed accommodating cavity. The first capillary structure is located on the inner wall of the pipe body and the same surface where the first housing and the tube body are connected. The working liquid is contained in the containing cavity. The disclosure also provides a method for manufacturing a heat dissipation structure and a device including the heat dissipation structure.

Description

Heat dissipation structure, manufacturing method and device of heat dissipation structure

The present application relates to the field of heat dissipation, and in particular to a heat dissipation structure, a manufacturing method and a device for the heat dissipation structure.

For devices with heat generating parts (such as mechanical equipment, electronic products, etc.), with the operation of the device, the heat generated by the heat generating parts is also increasing. Usually, a heat dissipation structure with a heat dissipation function is arranged on the surface of the heating element to dissipate the heat.

In the current heat dissipation structure, the capillary structure in the heat pipe is connected to the capillary structure at the bottom of the vapor chamber along the extension direction of the heat pipe, which will block the capillary structure at the steam channel, and the flow resistance of steam flowing into the end of the heat pipe is relatively high, which requires high steam pressure. Let the steam pass through, and the high steam pressure means that the temperature will increase and the thermal resistance will increase; and the above-mentioned capillary structure needs to be filled twice during the formation process, and there will be faults at the connection, which will affect the capillary return and cause thermal resistance. Increase.

Therefore, it is necessary to provide a heat dissipation structure with small thermal resistance.

In addition, it is also necessary to provide a method for manufacturing a heat dissipation structure and a device including the heat dissipation structure.

A heat dissipation structure, comprising a first shell, a pipe body, a second shell, a first capillary structure, and a working liquid; the first shell includes a main body and a connecting portion, the connecting portion is on one side of the main body and Bend to form a through hole; the tube body includes a first end and a second end, the first end is open, the second end is sealed, the first end communicates with the second end to form a cavity, The first end is connected to the connection part, and the cavity communicates with the through hole; the second shell is connected with the first shell and the tube body to form a sealed cavity; the first capillary The structure is located on the inner wall of the pipe body and the same surface where the first shell is connected to the pipe body; and the working liquid is accommodated in the accommodating chamber.

In some embodiments, the first end is located inside the connecting portion and connected to the connecting portion.

In some embodiments, the first end is located at the end connected to the connection part, and the first capillary structure also covers the connection part.

In some embodiments, the second housing has a groove, and the groove communicates with the cavity to form the accommodation cavity.

In some embodiments, the surface of the second housing facing the first housing is further provided with a second capillary structure, and the second capillary structure is connected to the first capillary structure.

A method for manufacturing a heat dissipation structure, comprising the following steps: providing a first shell, including a main body and a connecting portion, the connecting portion is bent to form a through hole on one side of the main body; providing a pipe body, The tube body includes a first end and a second end, the first end is open, the second end is sealed, the first end communicates with the second end to form a cavity, and the first end Connected with the connection part, the cavity communicates with the through hole; insert a core rod into the tube body, and reserve a gap between the core rod and the tube body; in the gap and the The same surface where the first shell is connected to the pipe body is filled with metal powder and then sintered, so that the metal powder forms a first capillary structure; Take out the mandrel; provide a second shell, connect the second shell and the first shell, the second shell and the first shell and the tube form a liquid injection and sealing the liquid injection port after injecting working liquid into the accommodation cavity, so as to obtain the heat dissipation structure.

In some embodiments, the number of the connecting parts is plural, and each of the connecting parts is connected to one of the tube bodies.

In some embodiments, the pipe body is passed through the through hole and overlapped with the connecting portion to connect with each other.

In some embodiments, a surface of the second housing facing the first housing is provided with a second capillary structure, and the second capillary structure is connected to the first capillary structure.

A device includes the heat dissipation structure.

In the heat dissipation structure provided by the present application, a first capillary structure with an integrated structure is provided on the surface of the first shell and the tube body, and the flow resistance is small and the heat dissipation is fast when the working fluid is heated and flows.

200: device

210: heating element

100: heat dissipation structure

10: The first shell

12: Main body

14: Connecting part

16: Through hole

20: tube body

22: first end

24: second end

26: Cavity

30: mandrel

35: The first capillary structure

50: second shell

52: Groove

53: sealing plug

54:Second capillary structure

60:Accommodating cavity

FIG. 1 is a schematic structural diagram of a device provided by an embodiment of the present application.

FIG. 2 is a structural schematic diagram of the heat dissipation structure shown in FIG. 1 .

FIG. 3 is a schematic cross-sectional view of a heat dissipation structure in an embodiment of the present application.

Fig. 4 is a schematic cross-sectional view of a first casing provided by an embodiment of the present application.

Fig. 5 is a schematic cross-sectional view of connecting the pipe body on the first casing shown in Fig. 4 .

Fig. 6 is a schematic cross-sectional view after a mandrel is inserted into the tube body shown in Fig. 5 .

Fig. 7 is a schematic cross-sectional view of the first capillary structure formed after the metal powder is filled and sintered between the tube body and the mandrel shown in Fig. 6 and the surface of the first shell.

Fig. 8 is a schematic cross-sectional view after removing the mandrel shown in Fig. 7 .

In order to more clearly understand the above objects, features and advantages of the present application, the present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. A lot of specific details are set forth in the following description to facilitate a full understanding of the application, and the described implementations are only a part of the implementations of the application, but not all of the implementations.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terminology used herein in the description of the application is only for the purpose of describing specific embodiments, and is not intended to limit the application. As used herein, the term "and/or" includes all and any combination of one or a plurality of the associated listed items.

In each embodiment of the present application, for the convenience of description and not to limit the present application, the term "connection" used in the description of the patent application and the patent scope of the present application is not limited to physical or mechanical connection, whether direct or indirect of. "Up", "Down", "Above", "Bottom", "Left", "Right" and so on are only used to indicate the relative positional relationship. When the absolute position of the described object changes, the relative positional relationship is also corresponding Change.

Please refer to FIG. 1 , a device 200 includes a heating element 210 and a heat dissipation structure 100 . The heat dissipation structure 100 is connected to the heat generating element 210, the heat generating element 210 generates heat during operation, the heat dissipation structure 100 transfers the heat to the heat dissipation structure 100, and the heat is quickly dissipated through the heat dissipation structure 100 sent out to maintain the stability of the working environment of the heating element 210. Wherein, the heating element 210 may be a battery, a CPU, and the like.

Please refer to FIG. 2 and FIG. 3 , the heat dissipation structure 100 includes a first shell 10 , a second shell 50 , a tube body 20 , a first capillary structure 35 and a working liquid (not shown).

The first shell 10 , the tube body 20 and the second shell 50 form a closed accommodating chamber 60 , the first capillary structure 35 is located on the inner wall of the tube body 20 and the first On the surface of the casing 10 , the working fluid is accommodated in the accommodating cavity 60 .

The first housing 10 includes a main body 12 and a connecting portion 14. The connecting portion 14 is extended to form a through hole 16 on one side of the main body 12, and each connecting portion 14 is surrounded to form a through hole. The holes 16 are surrounded by a plurality of connecting parts 14 to form a plurality of through holes 16 .

In some embodiments, the number of the tube body 20 is plural, each of the connecting parts 14 is connected to one of the tube bodies 20, and the plurality of connecting parts 14 are located on the same side of the main body part 12, and the plural The two tubes 20 are located on the same side of the main body 12 . The plural tubes 20 are beneficial to increase the heat dissipation area of the heat dissipation structure 100 , thereby improving the heat dissipation efficiency of the heat dissipation structure 100 .

The tube body 20 is substantially tubular. The tube body 20 includes a first end 22 and a second end 24 . The first end 22 and the second end 24 are connected to each other to form a cavity 26 . The first end 22 is open, the second end 24 is sealed, the first end 22 is connected to the connecting portion 14, the cavity 26 communicates with the through hole 16, and the second end 24 is connected to the through hole 16. The connecting portions 14 extend towards the same direction.

The first capillary structure 35 covers the inner wall of the tube body 20 and the same surface where the main body 12 and the tube body 20 are connected.

In some embodiments, the first end 22 of the tube body 20 is located inside the connecting portion 14 and connected to the connecting portion 14, that is, the tube body 20 overlaps with the connecting portion 14, and the The outer wall of the pipe body 20 is connected to the inner wall of the connecting portion 14 .

In some embodiments, the tube body 20 is located at the end of the connecting portion 14 away from the main body portion 12 and connected to the connecting portion 14 , the first capillary structure 35 covers the inside of the tube body 20 The wall covers the surface of the connecting portion 14 as well as the surface of the main body portion 12 .

The second housing 50 has a groove 52, the second housing 50 is located on the side of the first housing 10 away from the tube body 20, the second housing 50 and the first housing 50 The main body 12 at the outermost edge of a casing 10 is connected, and the groove 52 and the plurality of cavities 26 jointly form the accommodating cavity 60 . The arrangement of the groove 52 can increase the volume of the accommodating cavity 60 so as to accommodate more working liquid and improve the heat dissipation efficiency of the heat dissipation structure 100 .

In some embodiments, the surface of the second housing 50 facing the first housing 10 is further provided with a second capillary structure 54 , and the second capillary structure 54 is connected to the first capillary structure 35 . When the heat dissipation structure 100 is installed in the device 200, the surface of the second housing 50 facing away from the first housing 10 is connected to the heating element 210, and when the heating element 210 generates heat, the The temperature of the second casing 50 is higher than the temperature of the first casing 10 and the tube body 20, the working fluid in the second capillary structure 54 absorbs heat, and the working fluid after absorbing heat moves with the The first capillary structure 35 transfers heat into the tube body 20 so as to quickly dissipate the heat.

Please refer to FIG. 3 to FIG. 8 , the embodiment of the present application provides a manufacturing method of the heat dissipation structure 100 , including steps S1-S7.

Step S1 : Referring to FIG. 4 , a first housing 10 is provided, including a main body 12 and a connecting portion 14 . The connecting portion 14 is bent to form a through hole 16 on one side of the main body 12 .

That is, the area of the first casing 10 where the through hole 16 is not formed is the main body 12 , and the connecting portion 14 is connected to the main body 12 .

The number of said through holes 16 can be one or plural. In this embodiment, the number of the through holes 16 is plural, and the positions of the plural through holes 16 can be set as required, for example arranged in a certain array.

It can be understood that each through-hole 16 has a connecting portion 14 on its periphery, and a plurality of through-holes 16 has a plurality of connecting portions 14 . The plurality of connecting portions 14 are bent and extend toward the same direction, that is, the plurality of connecting portions 14 are located on the same side of the main body portion 12 .

Step S2: Please refer to FIG. 5, provide a tube body 20, the tube body 20 includes a first end 22 and a second end 24, the first end 22 is open, the second end 24 is sealed, and the first end 22 communicates with the second end 24 to form a cavity 26 for connecting the first end 22 with the connecting portion 14 , and the cavity 26 communicates with the through hole 16 .

The number of the tube bodies 20 is the same as the number of the connecting parts 14 , each of the connecting parts 14 is connected to one of the tube bodies 20 , and the second end 24 extends along the bending direction of the connecting parts 14 .

In some embodiments, the outer diameter of the first end 22 of the tube body 20 is adapted to the diameter of the through hole 16 , and the tube body 20 is passed through the through hole 16 . The outer wall of the first end 22 is connected to the inner wall of the connecting portion 14 , and can be integrated into one body by means of laser welding, diffusion welding, or the like.

In other embodiments, the first end 22 of the tube body 20 is connected to the end of the connecting portion 14 away from the main body 12 .

The material of the tube body 20 is a material with good thermal conductivity, such as metal, for improving heat dissipation efficiency.

Step S3: Please refer to FIG. 6 , insert a core rod 30 into the tube body 20 , and reserve a gap between the core rod 30 and the tube body 20 .

Understandably, the diameter of the mandrel 30 is smaller than the diameter of the through hole 16 . The mandrel 30 is inserted into the tubular body 20 from the first end 22 of the opening, the mandrel 30 is located at the center of the tubular body 20, and one end of the mandrel 30 abuts against the second end 24 or set apart from the second end 24 to reserve a space for subsequent formation of the first capillary structure 35 .

Step S4 : Please refer to FIG. 7 , filling the gap and the same surface where the first housing 10 and the tube body 20 are connected are filled with metal powder and then sintered, so that the metal powder forms a first capillary structure 35 .

In some embodiments, the metal powder fills the gap between the pipe body 20 and the mandrel 30 , and the metal powder is also laid on the joint between the main body 12 and the pipe body 20 . The surface of the same side, so that in the one-step sintering process, the first capillary structure 35 is continuously formed on the inner wall of the tube body 20 and the surface of the main body 12 at the same time, which can avoid the first capillary structure caused by multiple sintering. The case of Structure 35 Faults, additionally, can simplify the process.

In other embodiments, the metal powder also covers the surface of the connecting portion 14 .

Step S5: Referring to FIG. 8 , take out the mandrel 30 .

The first capillary structure 35 formed by sintering the metal powder is fixed on the inner wall of the tube body 20 and the surface of the connecting portion 14 . After the mandrel 30 is taken out from the tube body 20 , a cavity 26 is formed in the tube body 20 . It can be understood that the first capillary structure 35 is formed in the same sintering step, and the first capillary structure 35 is an integral structure without faults.

In some embodiments, the first capillary structure 35 also covers the surface of the connecting portion 14 .

It can be understood that, in this embodiment, the number of cavities 26 is plural.

Step S6: Please refer to FIG. 3 again, provide a second housing 50, connect the second housing 50 and the first housing 10, the second housing 50 and the first housing 10 and all The tube body 20 forms an accommodating chamber 60 with a liquid injection port (not shown).

The shape of the second shell 50 is roughly matched with the shape of the first shell 10 . The second housing 50 has a groove 52, the second housing 50 is located on the side of the first housing 10 away from the tube body 20, the second housing 50 and the first housing 50 The main body 12 at the outermost edge of a casing 10 is connected, and the groove 52 and the plurality of cavities 26 jointly form the accommodating cavity 60 .

When the second housing 50 is connected to the first housing 10 , a liquid injection port is reserved for injecting working fluid into the accommodating cavity 60 in a subsequent step.

In some embodiments, the surface of the second shell 50 facing the first shell 10 is further provided with a second capillary structure 54, and the second capillary structure 54 is connected with the first capillary structure 35, so as to facilitate Vapor transmission reduces thermal resistance.

Step S7: inject working liquid from the liquid injection port into the accommodation chamber 60 and then seal the liquid injection port to obtain the heat dissipation structure 100 .

The working liquid may be water, or other liquids capable of phase change during use, such as acetone, ethanol, and the like.

After injecting the working liquid 40 , perform vacuum treatment, and then seal the liquid injection port by welding or a sealing plug 53 .

In the heat dissipation structure 100 provided in the present application, a first capillary structure 35 with an integrated structure is provided on the surface of the first housing 10 and the tube body 20, and the flow resistance is small when the working fluid 40 is heated and flows. Fast heat dissipation; in the manufacturing process of the heat dissipation structure 100 provided by the present application, the first capillary structure 35 is formed in one sintering step to avoid faults; at the same time, the process is simplified and the cost is saved.

The above embodiments are only used to illustrate the technical solutions of the present application without limitation. Although the present application has been described in detail with reference to the above preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present application can be modified or equivalently replaced All should not deviate from the spirit and scope of the technical solution of the present application.

100: heat dissipation structure

10: The first shell

12: Main body

14: Connecting part

20: tube body

22: first end

24: second end

26: Cavity

35: The first capillary structure

50: second shell

52: Groove

54:Second capillary structure

60:Accommodating cavity

Claims (4)

A method for manufacturing a heat dissipation structure, the improvement of which includes the following steps: providing a first housing, including a main body and a connecting portion, the connecting portion is bent to form a through hole on one side of the main body; Provide a pipe body, the pipe body includes a first end and a second end, the first end is open, the second end is sealed, the first end communicates with the second end to form a cavity, and the The first end is connected to the connecting part, and the cavity communicates with the through hole; a core rod is inserted into the tube body, and a gap is reserved between the core rod and the tube body; The gap and the same surface where the first shell is connected to the pipe body are filled with metal powder and then sintered, so that the metal powder forms a first capillary structure; the mandrel is taken out; a second shell is provided to connect the The second housing and the first housing, the second housing, the first housing and the pipe body form an accommodating chamber with a liquid injection port; and inject work into the accommodating chamber The liquid then seals the liquid injection port to obtain the heat dissipation structure. The manufacturing method of the heat dissipation structure according to claim 1, wherein the number of the connecting parts is plural, and each of the connecting parts is connected to one of the tube bodies. The manufacturing method of the heat dissipation structure according to claim 1, wherein the pipe body is passed through the through hole and overlapped with the connecting part and connected with each other. The method for manufacturing a heat dissipation structure according to claim 1, wherein a second capillary structure is provided on the surface of the second shell facing the first shell, and the second capillary structure is connected to the first capillary structure .

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