Method for manufacturing ultrathin heat pipe
阅读说明：本技术 一种超薄热管的制造方法 (Method for manufacturing ultrathin heat pipe ) 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的制作方法,包括提供一热管两端开口的管壳,将管壳的第一端缩头,第二端保持不变,经由未缩头的第二端将毛细结构置入管壳,将置入毛细结构的管壳的第二端进行缩口,并对缩口端进行焊接,将焊接后的热管放入烧结治具内进行烧结。本发明工艺因管尾端未缩口,相比缩管后的缩管口孔径放大数倍级,毛细结构可以很轻松置入,使组装效律大大提升,无需要定位即可将毛细结构置入热管内,节省工序,降低成本且不易造成铜丝挂在管口,避免造成毛细结构损坏,热管的传热效率将大大提升。(The invention discloses a method for manufacturing an ultrathin heat pipe, which comprises the steps of providing a pipe shell with openings at two ends of the heat pipe, reducing the first end of the pipe shell, keeping the second end of the pipe shell unchanged, placing a capillary structure into the pipe shell through the second end without reducing the head, reducing the second end of the pipe shell with the capillary structure, welding the reduced end, and placing the welded heat pipe into a sintering jig for sintering. According to the process, the tail end of the pipe is not reduced, compared with the diameter of the reduced pipe opening which is enlarged by multiple times, the capillary structure can be easily arranged, the assembly efficiency is greatly improved, the capillary structure can be arranged in the heat pipe without positioning, the process is saved, the cost is reduced, the copper wire is not easily hung on the pipe opening, the damage of the capillary structure is avoided, and the heat transfer efficiency of the heat pipe is greatly improved.)
1. A manufacturing method of an ultrathin heat pipe comprises the following steps:
cutting a pipe, and providing a heat pipe shell, wherein the shell is provided with a first end and a second end which are open;
shrinking the first end of the heat pipe shell and keeping the second end unchanged, cleaning the surface and drying;
placing the capillary structure into the tube shell from the second end of the non-contracted head of the tube shell;
necking, namely necking the second end of the tube shell in the capillary structure and welding the necked end;
and sintering, namely placing the welded heat pipe into a sintering jig for sintering.
2. The method of manufacturing of claim 1, said step of capillary structure placement further comprising, prior to said step of capillary structure placement: an expansion part is arranged at the opening of the second end of the pipe shell which is not reduced, one end of the expansion part is connected with the opening of the second end, the caliber size of one end of the expansion part connected with the opening of the second end is smaller than or equal to the caliber size of the second end of the pipe shell, and the caliber size of one end of the expansion part far away from the second end of the heat pipe shell is larger than the caliber size of the second end of the pipe shell.
3. The method according to claim 2, wherein the connection between the expansion portion and the second end opening of the heat pipe shell is formed by welding, gluing, integral molding with the heat pipe shell, or inserting.
4. The manufacturing method according to any one of claims 1 to 3, further comprising the steps of refrigerant injection, degassing and packaging after the sintering step; the refrigerant is injected into the tube shell cavity with the capillary structure through the first end of the heat pipe shell; the degassing is vacuum degassing; the packaging adopts welding packaging.
5. The method according to any one of claims 1 to 3, wherein the heat pipe shell has a circular or elliptical or rectangular cross-section.
6. A method according to claim 3, wherein the wall thickness of the copper tube is less than 0.3mm, and the overall thickness of the copper tube is less than 1 mm.
7. The manufacturing method according to any one of claims 1 to 3, wherein the tube and shell material is one of copper material, aluminum material, stainless steel, titanium material or an alloy thereof.
8. The method of any one of claims 1 to 3, wherein the capillary structure is 3D braided copper wire, 2D braided mesh, foam copper or copper powder.
9. The method of claim 8, wherein the capillary structure is formed by etching, laser, machining, drawing, sintering, printing, or 3D printing.
Technical Field
The invention relates to the field of heat pipes, in particular 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 manufacturing process of the existing ultrathin heat pipe is extremely complex, and the process from feeding to finishing needs to be carried out through 20 large and small processes, especially, the process of placing a capillary structure on the ultrathin heat pipe is generally carried out by adopting two modes: the first method is to insert a core rod into the metal tube body to form a gap with a distance between the peripheral edge or partial peripheral edge of the core rod and the inner wall of the metal tube body, to fill metal powder into the gap, to heat and sinter the metal powder, to take out the core rod after sintering, the metal powder forms a capillary structure on the inner wall of the metal tube body, but the method can only form a capillary structure with a continuous shape on the surface of the inner wall, and cannot form capillary structures with other structures in the metal tube shell; the other traditional processing mode comprises the processing steps of pipe cutting, tail shrinking, head shrinking, cleaning, tail welding, wire arrangement, positioning, sintering, water injection, first removing, second removing, testing, packaging and the like, wherein the wire arrangement process is to directly arrange a metal wire or other capillary structures into a metal pipe shell of the heat pipe, but in the wire arrangement process, the threading process is difficult to complete and the processing difficulty is high because the pipe orifice of the metal pipe shell of the heat pipe is too small, and meanwhile, a copper wire is easy to hang on the pipe orifice to cause the damage of the capillary structures, so that the capillary capacity of the capillary structures is reduced, and the yield is too low.
Disclosure of Invention
In order to solve the technical problems, the invention provides the following technical scheme:
a manufacturing method of an ultrathin heat pipe comprises the following steps:
cutting a pipe, and providing a heat pipe shell, wherein the shell is provided with a first end and a second end which are open;
shrinking the first end of the heat pipe shell and keeping the second end unchanged, cleaning the surface and drying;
placing the capillary structure into the tube shell from the second end of the non-contracted head of the tube shell;
necking, namely necking the second end of the tube shell in the capillary structure and welding the necked end;
and sintering, namely placing the welded heat pipe into a sintering jig for sintering.
The manufacturing method also comprises a step of injecting a refrigerant, wherein after the step of sintering, the refrigerant is injected into the tube shell with the capillary structure from the end of the necking pipe, and the refrigerant is fluorinated liquid, alcohol, acetone, water, 7100 and refrigerants R22 and 1233. And (4) degassing the heat pipe filled with the refrigerant for 1-2 times in vacuum, and packaging to obtain an ultrathin heat pipe product.
The cross section of the pipe shell of the heat pipe is circular, elliptical or rectangular, the wall thickness of the copper pipe is less than 0.3mm, the total thickness of the copper pipe is less than 1mm, and the pipe material of the pipe shell is one of copper material, aluminum material, stainless steel and titanium material or alloy thereof.
The capillary structure is one of a 3D braided copper wire, a 2D braided net, foam copper or copper powder, and can be formed by adopting the technologies of etching, laser, machining, wire drawing, sintering, printing, 3D printing and the like.
In other embodiments, an expansion part is arranged at the second end opening of the pipe shell which is not reduced, one end of the expansion part is connected with the second end opening, the caliber size of the end of the expansion part connected with the second end opening is smaller than or equal to the caliber size of the second end of the pipe shell, the caliber size of the end of the expansion part far away from the second end of the heat pipe shell is larger than the caliber size of the second end of the pipe shell, and the connection between the expansion part and the second end opening of the heat pipe shell can be realized by welding, gluing, and integral forming processing or inserting with the heat pipe shell.
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 by multiple times, the copper wire can be easily placed in the reduced pipe, so that the efficiency can be improved by 20%; the heat pipe has a large wire placing pipe opening, so that the capillary structure is easily placed in the temperature equalizing plate, the capillary structure can be placed in the heat pipe without positioning, the working procedures are saved, and the cost is reduced by 10%; put the line back and contract the pipe, put the spool mouth great, be difficult for causing the copper wire to hang at the mouth of pipe, cause the capillary structure to damage to can not reduce the capillary ability of capillary structure, the heat transfer efficiency of heat pipe will promote greatly.
Drawings
FIG. 1 is a schematic view of a first embodiment of a method for manufacturing an ultra-thin heat pipe according to the present invention;
FIG. 2 is a schematic view of a second embodiment of the method for manufacturing an ultra-thin heat pipe according to the present invention;
FIG. 3 is a flow chart of the steps of the method for manufacturing an ultra-thin heat pipe according to the present invention.
Wherein the reference numerals are as follows:
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 the operation steps of a first embodiment of the ultra-thin heat pipe manufacturing method of the present invention, first providing a
And injecting a refrigerant into the
Fig. 2 schematically shows the operation steps of a second embodiment of the ultra-thin heat pipe manufacturing method of the present invention, different from the first embodiment, an
After the
And injecting a refrigerant into the
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.
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