CN209978683U

CN209978683U - Heat pipe capable of reducing heat transfer obstruction

Info

Publication number: CN209978683U
Application number: CN201920609580.2U
Authority: CN
Inventors: 周志勇
Original assignee: Shenzhen Shangyi Industrial Co Ltd
Current assignee: Shenzhen Shangyi Industrial Co Ltd
Priority date: 2019-04-29
Filing date: 2019-04-29
Publication date: 2020-01-21
Anticipated expiration: 2029-04-29

Abstract

The utility model relates to a heat transfer element technical field discloses a can reduce heat pipe that heat transfer hinders, including shell, porous capillary structure, sintering layer capillary structure, evaporation zone and condensation zone, the shell seals and inside has the cavity, the evaporation zone with the condensation zone is located respectively can reduce the both ends of the heat pipe that heat transfer hinders, porous capillary structure is including being located a plurality of holes on the inner wall of shell, sintering layer capillary structure including cover in the powder sintering layer on porous capillary structure's surface. The utility model provides a capillary structure of heat pipe can reduce radial heat transfer and hinder to increase capillary suction, can go out the heat transfer in evaporating zone as early as possible, and the liquid in the shell can flow back smoothly.

Description

Heat pipe capable of reducing heat transfer obstruction

Technical Field

The utility model relates to a heat transfer element technical field especially relates to a can reduce heat pipe that heat transfer hinders.

Background

With the increasing demands of consumers on various electronic products, the electronic products are gradually developing towards small and portable. However, after the volume of the product is reduced, the internal space of the product is also limited, the internal elements are arranged compactly, heat dissipation is not facilitated, and the problem of overheating of the elements is easy to occur. In order to solve this problem, a heat pipe is usually disposed at the position of the heat-generating element to reduce the temperature. The heat pipe is generally composed of a shell, a liquid absorption core and an end cover, wherein the interior of the heat pipe is pumped into a negative pressure state and filled with a proper amount of liquid with a lower boiling point, and the liquid is easy to volatilize. The liquid absorption core is positioned at the pipe wall and has a capillary structure. One end of the heat pipe is an evaporation end, and the other end is a condensation end. When the evaporation end of the heat pipe is heated, the liquid in the pipe is quickly evaporated, the vapor flows to the condensation end under a slight pressure difference, the vapor is condensed into liquid again when meeting the cold at the condensation end to release heat, and the liquid flows back to the evaporation section along the liquid absorption core, so that the heat can be continuously conducted. In this process, the liquid needs to be refluxed by the capillary suction of the wick capillary structure. The conventional capillary structure has a sintered layer capillary structure, but the sintered layer capillary structure has a large heat transfer resistance along the radial direction, and therefore, a heat pipe capable of reducing the heat transfer resistance is urgently needed.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a can reduce the heat pipe that blocks of conducting heat, the capillary structure of this heat pipe can reduce radial heat transfer and block to increase capillary suction, can go out the heat transfer in evaporation zone as early as possible, and the liquid in the shell can flow back smoothly.

The utility model provides a technical scheme that its technical problem adopted is:

the heat pipe comprises a shell, a porous capillary structure, a sintering layer capillary structure, an evaporation area and a condensation area, wherein the shell is closed, a cavity is formed in the shell, the evaporation area and the condensation area are respectively located at two ends of the heat pipe capable of reducing heat transfer obstruction, the porous capillary structure comprises a plurality of holes located on the inner wall of the shell, and the sintering layer capillary structure comprises a powder sintering layer covering the surface of the porous capillary structure.

As an improvement of the technical scheme, a plurality of bulges and/or grooves are arranged on the surface of one side of the sintering layer, which is far away from the inner side wall of the shell.

As a further improvement of the above technical solution, the thickness of the sintered layer capillary structure gradually decreases from the evaporation zone to the condensation zone.

As a further improvement of the above technical solution, the powder particle size of the powder sintered layer from the evaporation zone to the condensation zone gradually increases.

As a further improvement of the technical scheme, the porosity range of the porous capillary structure is 20% -60%, the pore diameter range of the pores is 0.01-0.2 mm, and the depth range of the pores is 0.05-0.8 mm.

As a further improvement of the above technical solution, the pore diameter of the pores of the porous capillary structure from the evaporation zone to the condensation zone gradually increases, and the porosity gradually decreases.

As a further improvement of the technical scheme, a plurality of supporting columns are further arranged in the cavity.

As a further improvement of the technical scheme, a supporting plate is further arranged in the cavity, and a plurality of through holes are formed in the supporting plate.

The utility model has the advantages that: the utility model provides a capillary structure of heat pipe can reduce radial heat transfer and hinder to increase capillary suction, can go out the heat transfer in evaporating zone as early as possible, and the liquid in the shell can flow back smoothly.

Drawings

The invention will be further described with reference to the following figures and examples:

FIG. 1 is a cross-sectional view of a heat pipe (excluding support posts/plates) in a first embodiment of the invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a schematic cross-sectional view of a heat pipe according to a first embodiment of the present invention;

fig. 4 is a schematic cross-sectional view of a heat pipe according to a second embodiment of the present invention.

Detailed Description

The conception, specific structure and technical effects of the present invention will be described clearly and completely with reference to the accompanying drawings and embodiments, so as to fully understand the objects, aspects and effects of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Furthermore, the description of the upper, lower, left, right, front, rear, etc. used in the present invention is only relative to the mutual position relationship of the components of the present invention in the drawings.

Furthermore, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any combination of one or more of the associated listed items.

Referring to fig. 1 to 3, a cross-sectional view (excluding the support column/plate), a partially enlarged view and a cross-sectional view of the heat pipe in the first embodiment of the present invention are shown. The heat pipe comprises a housing 1 and a capillary structure 2. The capillary structure 2 is located at the inner side wall of the housing 1. The shell 1 of the heat pipe is hollow and closed at the end, and a cavity 3 is formed inside the shell. A proper amount of low-melting-point working liquid such as water, ethanol or acetone is placed in the cavity 3. The capillary structure 2 is formed by compounding a porous capillary structure 21 and a sintered layer capillary structure 22. The porous capillary structure 21 includes a plurality of minute holes 211 on the inner side wall of the housing 1, and the sintered layer capillary structure 22 includes a powder sintered layer attached to the surface of the porous capillary structure 21.

A plurality of minute holes 211 are formed on the inner side wall of the housing 1 by a chemical etching or electrochemical etching method to form the porous capillary structure 21. If the size of the hole 211 is too large, the porosity is too small, and the capillary suction force to the liquid may be insufficient, and if the size of the hole 211 is too small, the porosity is too large, and although the capillary suction force is large, the flow resistance of the liquid is increased accordingly, and therefore, the porosity and the size of the hole need to be in a relatively balanced range. Typically, the porosity of the porous capillary structure 21 ranges from 20% to 60%, the pore diameter of the pores 211 ranges from 0.01mm to 0.2mm, and the depth of the pores 211 ranges from 0.05mm to 0.8 mm.

The material of the heat pipe can be adjusted according to the parameters of the etching solution or the etching power supply, and usually, copper, aluminum, stainless steel, titanium alloy, and the like can be selected. And selecting the parameters of the porous capillary structure according to the use requirement, and selecting proper concentration of the etching solution and power supply parameters according to the parameters. The fabrication of holes in a metal surface by etching is well known in the art and will not be described herein.

After the porous capillary structure 21 is formed on the inner side wall of the housing 1, metal powder sintering is performed on the surface of the porous capillary structure 21, thereby forming a sintered layer capillary structure 22 at the surface of the porous capillary structure 21. If the thickness of the sintered layer capillary structure 22 is too small, the capillary suction force for the working liquid may be insufficient, and if the thickness of the sintered layer capillary structure 22 is too large, the radial heat transfer capability thereof is not good. Typically, the sintered layer capillary structure 22 is set to a thickness in the range of 0.05mm to 0.8 mm.

In this embodiment, the surface of the sintering layer 22 is a smooth curved surface, and a plurality of protrusions and/or grooves may be further disposed on the surface of the sintering layer 22 on the side away from the inner wall of the housing, so as to increase the surface area of the sintering layer 22, thereby improving the heat transfer efficiency.

The heat pipe is provided with an evaporation area 11 and a condensation area 12, the evaporation area 11 and the condensation area 12 are respectively positioned at two end areas of the heat pipe, and the area between the evaporation area 11 and the condensation area 12 is an adiabatic area. The housing at the evaporation zone 11 is in contact with a heat source that causes the working liquid inside the evaporation zone 11 to evaporate into a gas. The gas flows in the cavity 3 to the condensation area 12, and a heat dissipation fin (not shown) is disposed at the housing of the condensation area 12, and a fan is disposed to accelerate the heat transfer in the area. The gas will be liquefied into liquid in the region when meeting cold, and the liquid will flow back to the evaporation area 11 tightly attached to the inner side wall of the housing 1 under the action of the capillary suction force of the capillary structure 2.

In order to achieve a rapid return of the working fluid, the parameters of the capillary structure 2 can be varied in the axial direction of the heat pipe. The pore size of the porous capillary structure from the evaporation zone 11 to the condensation zone 12 is gradually increased, the pore depth is gradually reduced, and the porosity is gradually reduced. The thickness of the sintered layer capillary structure 22 from the evaporation zone 11 to the condensation zone 12 is gradually reduced and the powder particle size of the powder sintered layer is gradually increased. By the means, the capillary suction force of the capillary structure 2 to the liquid can be gradually reduced from the evaporation area 11 to the condensation area 12, and the liquid in the condensation area 12 can be favorably reflowed to the evaporation area 11 as soon as possible.

In addition, in order to enhance the support for the pipe wall of the heat pipe, a support column 4 can be placed in the cavity of the heat pipe to support the heat pipe, so that the heat pipe is prevented from being deformed due to too low strength in use. The two ends of the support column 4 are fixed on the inner wall of the heat pipe. In order to avoid that the support pillars 4 block the flow channels in the cavity 3, the support pillars 4 may not be arranged too densely. Alternatively, a support plate may be provided, the shape of which is matched with the cross-sectional shape and size of the heat pipe, and a plurality of through holes may be provided on the support plate as gas flow passages.

In this embodiment, the performance of the heat pipe is made more excellent by combining the porous capillary structure with the sintered layer capillary structure. The radial thermal resistance is reduced, and the capillary suction force to the working liquid is increased, so that the heat pipe has better heat transfer capacity.

Referring to fig. 4, a schematic cross-sectional view of a heat pipe in a second embodiment of the present invention is shown. The present embodiment differs from the first embodiment only in the shape of the casing of the heat pipe. The housing may be shaped as desired, tubular being not the only option.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A heat pipe capable of reducing heat transfer obstruction is characterized by comprising a shell, a porous capillary structure, a sintering layer capillary structure, an evaporation area and a condensation area, wherein the shell is closed and is internally provided with a cavity, the evaporation area and the condensation area are respectively positioned at two ends of the heat pipe capable of reducing heat transfer obstruction, the porous capillary structure comprises a plurality of holes positioned on the inner wall of the shell, and the sintering layer capillary structure comprises a powder sintering layer covering the surface of the porous capillary structure.

2. A heat pipe capable of reducing heat transfer hindrance according to claim 1, wherein a surface of a side of said sintered layer away from an inner side wall of said case is provided with protrusions and/or grooves.

3. A heat pipe with reduced heat transfer hindrance according to claim 1 wherein the sintered layer capillary structure decreases in thickness from the evaporation zone to the condensation zone.

4. A heat pipe capable of reducing heat transfer hindrance according to claim 1, wherein a powder particle diameter of said powder sintered layer from said evaporation zone to said condensation zone is gradually increased.

5. A heat pipe capable of reducing heat transfer hindrance according to claim 1 wherein said porous wick structure has a porosity in the range of 20% to 60%, said holes have a pore size in the range of 0.01mm to 0.2mm, and said holes have a depth in the range of 0.05mm to 0.8 mm.

6. A heat pipe with reduced heat transfer resistance as defined in claim 1, wherein the pores of the porous capillary structure from the evaporation zone to the condensation zone have a gradually increasing pore size and a gradually decreasing porosity.

7. A heat pipe with reduced heat transfer obstruction as recited in claim 1 wherein a plurality of support posts are also disposed within said cavity.

8. A heat pipe with reduced heat transfer hindrance according to claim 1 wherein a support plate is further provided in said cavity, and said support plate is provided with a plurality of through holes.