阅读说明：本技术 一种超薄热管及其制作方法 (Ultrathin heat pipe and manufacturing method thereof ) 是由 罗合云 梁平平 李学华 于 2019-10-16 设计创作，主要内容包括：本发明公开了一种超薄热管及其制作方法,以一端锥形的定位棒作为引导,将折弯后贴合与定位棒表面的吸液芯毛细结构置入热管金属管壳内部,通过烧结在管壳内壁形成多支排布的吸液芯毛细结构。本发明可形成多支排布的毛细结构,增加传热面积,提高传热效率,操作灵活,加工难度大大下降,且不易造成铜丝挂在管口,造成毛细结构损坏,从而不会降低毛细结构的毛细能力,热管的传热效率将大大提升。(The invention discloses an ultrathin heat pipe and a manufacturing method thereof.A positioning rod with a conical end is used as a guide, a wick capillary structure which is bent and attached to the surface of the positioning rod is arranged in a metal pipe shell of the heat pipe, and a plurality of wick capillary structures which are distributed in an array are formed on the inner wall of the pipe shell through sintering. The invention can form a plurality of capillary structures which are distributed, increase the heat transfer area, improve the heat transfer efficiency, has flexible operation and greatly reduced processing difficulty, and is not easy to cause copper wires to hang on the pipe orifice to cause the damage of the capillary structures, thereby not reducing the capillary capacity of the capillary structures and greatly improving the heat transfer efficiency of the heat pipe.)

1. An ultra-thin heat pipe, comprising:

the metal tube shell is provided with a length along the axial direction, and a closed cavity is formed inside the metal tube shell;

the liquid absorption core capillary structure is of a plurality of arrangement structures and is attached to the inner wall of the metal pipe shell, and the liquid absorption core capillary structure is an even number of metal wires;

a working fluid sealed within the enclosed cavity of the metal envelope.

2. An ultra-thin heat pipe as claimed in claim 1, wherein the metal pipe case is made of one of copper material, aluminum material, stainless steel, titanium material or alloy thereof; the cross section of the metal pipe shell is circular, elliptical or rectangular.

3. The ultra-thin heat pipe of any of claims 1 or 2 wherein the wire of the wick capillary structure is copper, nickel, zinc, silver; the wick capillary structure can be formed by etching, laser, machining, wire drawing, sintering, printing, 3D printing and other technologies.

4. The ultra-thin heat pipe of any one of claims 1 or 2, wherein the working fluid is a refrigerant medium, and the refrigerant medium is fluorinated liquid, alcohol, acetone, water, 7100, R22, 1233.

5. A method for manufacturing an ultra-thin heat pipe as claimed in claims 1-4, comprising the steps of:

providing a metal pipe shell, wherein the metal pipe shell is provided with a first end and a second end which are respectively provided with openings, the first end of the heat pipe shell is contracted, and the second end of the heat pipe shell is kept unchanged;

providing a positioning rod, wherein the outer diameter of the positioning rod is smaller than the inner diameter of the metal pipe shell, and one end of the positioning rod is conical;

providing a wick capillary structure, wherein the wick capillary structure forms a bend at the conical top of the positioning rod, and the wick capillary structure is attached to the outer surface of the positioning rod after being bent;

placing a positioning rod with a bent wick capillary structure attached to the outer surface into the metal tube shell through a second end opening of the non-shrinking head, wherein the conical end of the positioning rod is positioned at the first end of the shrinking head of the metal tube shell;

sintering;

and after sintering, the positioning rod is extracted from the metal tube shell.

6. The method of claim 5, wherein the wick capillary structures are at least one group, and after the first group of wick capillary structures are bent and attached to the outer surface of the positioning rod, the remaining groups of wick capillary structures are bent and attached to the outer surface of the positioning rod in the same manner.

7. The method of claim 5 or 6, further comprising, after the sintering step, the steps of necking the second end and welding, injecting a cooling medium, degassing, and encapsulating the necked portion; the refrigerant is injected into the tube shell cavity with the wick capillary structure through the first end of the heat pipe shell; the degassing is vacuum degassing; the packaging adopts welding packaging.

8. A method for making an ultra-thin heat pipe as claimed in claim 7, wherein the metal casing is made of one of copper, aluminum, stainless steel, titanium or their alloys; the cross section of the metal pipe shell is circular, elliptical or rectangular.

9. A method for fabricating an ultra-thin heat pipe as claimed in claim 7, wherein the wick is a capillary structure of copper, nickel, zinc, or silver; the wick capillary structure can be formed by etching, laser, machining, wire drawing, sintering, printing, 3D printing and other technologies.

10. A method for fabricating an ultra-thin heat pipe as claimed in claim 7, wherein the working fluid is a refrigerant medium, and the refrigerant medium is fluorinated liquid, alcohol, acetone, water, 7100, and refrigerant R22, 1233.

Technical Field

The invention belongs to the field of heat pipe temperature equalizing plates, and particularly relates to a manufacturing process of an ultrathin heat pipe.

Background

With the advance of science and technology, the current electronic products are developed towards high functionality, high efficiency, and light weight, especially, 5G is the future development trend in the field of consumer electronics, and the power consumption of the chip is much higher than that of a 4G chip while the computing power of the chip is significantly improved, so that the demand of the consumer electronics for heat dissipation in the future will be more intense. The power consumption of the chip is increased, so that the heat generated in a unit area is greatly increased, and how to quickly disperse the heat of the chip is always a difficult point and bottleneck in the industry. Therefore, the super heat conductive material and the heat dissipation material for rapidly conducting the heat of the chip need to be continuously improved to solve the problem of heat dissipation of the chip, so as to promote the continuous development of technology.

The heat pipe has the advantages of light weight, high heat conduction, high reliability, no maintenance, no noise and the like, and is a recyclable green and environment-friendly technology. Compared with the conventional copper sheet or aluminum sheet, the heat conduction coefficient of the heat pipe is more than 10 times, and the high heat conduction characteristic of the heat pipe is very suitable for heat dissipation of a concentrated heat source. The existing heat pipe is complex in manufacturing process, often adopts a capillary structure to be directly placed in, but the processing accuracy and difficulty are high and the efficiency is low due to the small pipe diameter opening; or the core body is firstly placed into the metal tube shell to form a gap, then the metal powder is filled into the gap, and sintering is carried out to form the capillary structure on the surface of the tube shell, but the capillary structure with the required shape (such as a line or a plurality of arranged lines) can not be formed by the method.

Disclosure of Invention

The invention provides a multi-branch distribution structure of an ultrathin heat pipe liquid absorption core and a manufacturing method thereof aiming at the existing problems, and particularly provides the following technical scheme:

an ultra-thin heat pipe, comprising:

the metal tube shell is provided with a length along the axial direction, and a closed cavity is formed inside the metal tube shell;

the liquid absorption core capillary structure is of a plurality of arrangement structures and is attached to the inner wall of the metal pipe shell, and the liquid absorption core capillary structure is an even number of metal wires;

a working fluid sealed within the enclosed cavity of the metal envelope.

The manufacturing method of the ultrathin heat pipe is characterized by comprising the following steps of:

providing a metal pipe shell, wherein the metal pipe shell is provided with a first end and a second end which are respectively provided with openings, the first end of the heat pipe shell is contracted, and the second end of the heat pipe shell is kept unchanged;

providing a positioning rod, wherein the outer diameter of the positioning rod is smaller than the inner diameter of the metal pipe shell, and one end of the positioning rod is conical;

providing a wick capillary structure, wherein the wick capillary structure forms a bend at the conical top of the positioning rod, and the wick capillary structure is attached to the outer surface of the positioning rod after being bent;

placing a positioning rod with a bent wick capillary structure attached to the outer surface into the metal tube shell through a second end opening of the non-shrinking head, wherein the conical end of the positioning rod is positioned at the first end of the shrinking head of the metal tube shell;

sintering;

and after sintering, the positioning rod is extracted from the metal tube shell.

Furthermore, the manufacturing method of the ultrathin heat pipe further comprises the step of bending and attaching the multiple groups of wick capillary structures to the surface of the positioning rod, and then placing the positioning rod into the metal pipe shell. Therefore, multiple groups of liquid absorption core capillary structures which are uniformly or non-uniformly distributed without overlapping along the circumferential direction can be formed on the inner wall of the metal tube shell through sintering.

Furthermore, the manufacturing method of the ultrathin heat pipe also comprises the steps of necking the second end and welding, injecting a refrigerant, degassing and packaging the necking after the sintering step; the refrigerant is injected into the tube shell cavity with the wick capillary structure through the first end of the heat pipe shell; the degassing is vacuum degassing; the packaging adopts welding packaging.

Furthermore, the metal pipe shell is made of one of copper, aluminum, stainless steel and titanium or an alloy thereof; the cross section of the metal pipe shell is circular, elliptical or rectangular.

Furthermore, the metal wire of the capillary structure of the liquid absorption core is made of copper, nickel, zinc and silver; the wick capillary structure can be formed by etching, laser, machining, wire drawing, sintering, printing, 3D printing and other technologies.

Further, the working fluid is a refrigerant medium, and the refrigerant medium is fluorinated liquid, alcohol, acetone, water, 7100, and refrigerants R22 and 1233.

The invention has the beneficial effects that:

according to the process, the tail end of the pipe is not reduced, the diameter is larger, and compared with the diameter of the reduced pipe after the pipe is reduced, the diameter is enlarged by multiple times, the capillary structure can be easily arranged, and the efficiency can be greatly improved; the required liquid absorption core structure is placed into the tube shell according to needs under the guide of the positioning rod, a plurality of arranged capillary structures can be formed, the heat transfer area is increased, the heat transfer efficiency is improved, the operation is flexible, the processing difficulty is greatly reduced, the copper wire is not easy to hang on the tube opening, the damage of the capillary structures is caused, the capillary capacity of the capillary structures cannot be reduced, and the heat transfer efficiency of the heat pipe is greatly improved.

Drawings

FIG. 1 is a schematic diagram of materials required by the method for manufacturing an ultra-thin heat pipe according to the present invention;

FIG. 2 is a schematic diagram of the steps of the method for manufacturing an ultra-thin heat pipe according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating some embodiments of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 schematically shows materials required for an ultra-thin heat pipe manufacturing method according to the present invention, a metal pipe shell 1 is provided, the metal pipe shell has a first end 11 and a second end 12 which are respectively opened, the first end 11 of the heat pipe shell 1 is shrunk, the second end 12 is kept unchanged, and the metal pipe shell 1 has a cavity inside for forming a wick capillary structure 3 and packaging a working fluid required for heat transfer; providing a positioning rod 2, wherein the outer diameter of the positioning rod 2 is smaller than the inner diameter of the metal pipe shell 1, and one end of the positioning rod 2 is conical.

Fig. 2 schematically shows the operation steps of the method for manufacturing an ultrathin heat pipe according to the present invention, in which a wick capillary structure 3 is provided, the wick capillary structure 3 forms a bend at the conical vertex of the positioning rod 2, and the wick capillary structure 3 is attached to the outer surface of the positioning rod 2 after being bent; placing a positioning rod 2 with a bent wick capillary structure 3 attached to the outer surface into the metal pipe shell 1 through a second end 12 opening of the metal pipe shell 1, wherein the second end is not contracted, and the conical end of the positioning rod is positioned at a first end 11 of the metal pipe shell 1; sintering; after sintering, the positioning rod 2 is drawn out from the metal tube shell 1, the liquid absorption core capillary structure 3 is combined with the inner wall of the metal tube shell 1 through sintering, and a plurality of required capillary structures are formed on the surface of the inner wall. The sintering step further comprises the steps of necking the second end 12, welding and sealing the necking, injecting a refrigerant, degassing and packaging; the refrigerant is injected into the tube shell cavity with the wick capillary structure through the first end 11 of the heat pipe tube shell 1; the degassing is vacuum degassing; the packaging adopts welding packaging.

In another embodiment, after the first group of wick capillary structures 3 are bent, the plurality of groups of wick capillary structures may be bent in the same manner as required, so that the plurality of groups of wick capillary structures are uniformly or non-uniformly arranged without overlapping along the circumferential direction of the outer surface of the positioning rod 2 after being bent. And then the positioning rod 2 which is bent and provided with a plurality of groups of wick capillary structures is placed into the metal tube shell 1 through the second end 12 opening of the metal tube shell 1 without the head shrinking, the positioning rod 2 is pulled out of the metal tube shell 1 after sintering, and the inner wall of the metal tube shell 1 forms a plurality of groups of wick capillary structures which are uniformly or non-uniformly distributed without overlapping along the circumferential direction.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "both ends", "both sides", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the elements referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus, are not to be construed as limiting the present invention.

What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.