CN113566627B

CN113566627B - Heat pipe structure

Info

Publication number: CN113566627B
Application number: CN202110699140.2A
Authority: CN
Inventors: 林子平; 张富贵
Original assignee: Asia Vital Components Co Ltd
Current assignee: Asia Vital Components Co Ltd
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2023-04-11
Anticipated expiration: 2041-06-23
Also published as: CN113566627A

Abstract

The present invention provides a heat pipe structure, comprising: the body is internally provided with an airtight chamber, the wall surface of the airtight chamber is provided with at least one capillary structure and is filled with a working fluid, the body is provided with at least one stress concentration area, the capillary structure corresponding to the stress concentration area is provided with a fixed strengthening piece used for strengthening and fastening the capillary structure on the wall surface, and when the heat pipe is bent, bent and deformed by the aid of the fixed strengthening piece arranged in the stress concentration area, the fixed strengthening piece can prevent or avoid the capillary structure arranged in the stress concentration area from being cracked, damaged or destroyed.

Description

Heat pipe structure

Technical Field

The present invention relates to a heat pipe structure, and more particularly, to a heat pipe structure capable of preventing the deflection, bending, and deformation of a heat pipe and ensuring that an internal capillary structure is not damaged by cracking.

Background

The heat pipe is a common heat transfer element, and is often used in heat conduction work of a part needing surface-to-surface heat conduction in electronic equipment or a handheld device, an airtight chamber is arranged in the heat pipe and filled with a working liquid, and heat conduction is carried out by the working liquid in a two-phase flow mode, and the heat pipe belongs to point-to-point rapid heat conduction.

As the electronic devices are becoming lighter and thinner, the space inside the electronic devices and the heat pipes is becoming smaller, so the heat pipes must be shaped (i.e. bent and deformed) in a limited space to fit the remaining space, and to be placed in the space for heat conduction with the heat source.

When the heat pipe is manufactured, firstly, a hollow pipe is provided, a central rod with the diameter smaller than the inner diameter of the hollow pipe is arranged in the hollow pipe, metal powder is filled between the central rod and the hollow pipe, the metal powder is compacted, then, sintering operation is carried out, then, the hollow pipe is filled with water, vacuumized, sealed and the like, and the capillary structure is used by a manufacturer by arranging an axial groove on the wall surface of the hollow pipe or placing a curled mesh body in the hollow pipe, wherein the three capillary structures are common capillary structures in the heat pipe, and finally, the heat pipe is pressed into a flat shape to form the flat heat pipe after the capillary structure is arranged in the hollow pipe, so that the flat heat pipe can be conveniently arranged at a narrow space.

When the formed heat pipe is bent and deformed, the internal capillary is easily damaged, for example, the sintered powder body cracks and falls off at the bent position, and the groove is excessively deformed when the heat pipe is flattened, for example, the groove is squeezed to lose the original width of the groove or is excessively stretched to expand the original width of the groove, or the grid body is separated from the wall surface to cause the heat pipe to lose the capillary force.

Therefore, it is the first goal of those skilled in the art to improve the problem of the internal capillary structure damage caused by the heat pipe being flattened or shaped.

Disclosure of Invention

Accordingly, the present invention is directed to a heat pipe structure for preventing the internal capillary structure from being damaged and lost after the heat pipe is bent and deformed.

In order to achieve the purpose, the invention adopts the technical scheme that:

a heat pipe structure, comprising:

the body is internally provided with an airtight cavity, the wall surface of the airtight cavity is provided with at least one capillary structure and is filled with working fluid, the body is provided with at least one stress concentration area, and the capillary structure corresponding to the stress concentration area is provided with a holding strengthening piece.

The heat pipe structure, wherein: the stress concentration area is arranged at one of the deformed part of the body or the secondary processed part after molding or the bent and bent deformed part.

The heat pipe structure, wherein: the capillary structure is a plurality of grooves, sintered powder bodies or grid bodies, and the holding strengthening piece is covered on the surface of the capillary structure which is combined with the corresponding stress concentration area of the airtight chamber or embedded in the capillary structure.

The heat pipe structure, wherein: the body, the capillary structure and the holding and strengthening piece are made of any one of copper, aluminum, stainless steel, titanium alloy and aluminum alloy, and the body, the capillary structure and the holding and strengthening piece are made of the same or different materials.

The heat pipe structure, wherein: the working fluid is any one of acetone, pure water and alcohol.

The heat pipe structure of the invention can prevent the internal capillary structure of the heat pipe from being damaged after the heat pipe is deformed by bending and bending after the heat pipe is manufactured.

Drawings

FIG. 1 is a sectional view of a first embodiment of a heat pipe structure of the present invention;

FIG. 2 is a cross-sectional view of a second embodiment of the heat pipe structure of the present invention.

Description of reference numerals: a body 1; a gas-tight chamber 11; a capillary structure 12; a stress concentration zone 13; a working fluid 2; holding the stiffener 3.

Detailed Description

The above objects, together with the structural and functional features thereof, are accomplished by the preferred embodiments according to the accompanying drawings.

Referring to fig. 1, a cross-sectional view of a first embodiment of a heat pipe structure of the present invention is shown, wherein the heat pipe structure of the present invention comprises: a body 1;

the body 1 can be a single body or a corresponding cover of upper and lower plates, wherein the body has an airtight chamber 11 inside, the wall of the airtight chamber 11 is provided with at least one capillary structure 12 and filled with a working fluid 2, the body 1 has at least one stress concentration region 13, the capillary structure 12 corresponding to the stress concentration region 13 is provided with a holding strengthening member 3.

The stress concentration area 13 of the body 1 is mainly formed after the body 1 is manufactured, and in order to conform to the set space or position, an external force is applied to flex, bend and deform the body 1, including flattening the body 1 into a flat shape by a circle, at this time, the stress concentration area 13 is located at a corner position of a joint of the flat surface and an arc surface of the body 1, or at a plane position where the body 1 is excessively extended, or at a position where the body 1 is bent, and the capillary structure 12 correspondingly arranged at the stress concentration area 13 is damaged due to stress concentration.

The body 1, the capillary structure 12 and the holding reinforcement member 3 are made of any one of copper, aluminum, stainless steel, titanium alloy, aluminum alloy or plastic, the body 1, the capillary structure 12 and the holding reinforcement member 3 can be made of any one of the same or different materials, and the working fluid 2 is any one of refrigerant, acetone, pure water and alcohol.

The capillary structure 12 of the present embodiment is a sintered powder body, a groove, a grid body, and a fiber body, and the present embodiment uses sintered powder as an illustrative embodiment, and not limited thereto, the holding and reinforcing member 3 is covered or embedded on the surface and/or inside of the capillary structure 12 (sintered powder) of the stress concentration region 13 of the body 1, and when the body 1 is pressed by an external force (bent and bent) to deform, the holding and reinforcing member 3 can completely grip the surface of the capillary structure 12 disposed in the stress concentration region 13, so as to prevent the capillary structure 12 (sintered powder) from cracking and falling off, so that the internal capillary structure 12 is kept complete, and thus the complete operation of the internal two-phase flow is maintained.

Referring to fig. 2, a cross-sectional view of a second embodiment of the heat pipe structure of the present invention is shown, and a part of the structure of this embodiment is the same as that of the first embodiment, and therefore will not be described herein again, but the difference between this embodiment and the first embodiment is that the capillary structure 12 is a plurality of grooves, the holding and strengthening member 3 covers and is combined on the surface of the capillary structure 12 at the stress concentration region 13 of the airtight chamber 11, and the width of the grooves is limited by the holding and strengthening member 3, so as to prevent the internal capillary structure 12 (grooves) from being excessively deformed (reduced or excessively expanded) when the body 1 is plastically deformed by an external force, and to maintain the capillary force of the capillary structure 12.

The capillary structure 12 is a plurality of grooves, the holding reinforcement member 3 is covered and combined on the surface of the airtight chamber 11 corresponding to the stress concentration area 13, and the holding reinforcement member 3 limits the width of the grooves to prevent the grooves from being deformed excessively.

In addition to the above description, the combination of the capillary structure 12 and the holding reinforcement member 3 in the first and second embodiments is to arrange the holding reinforcement member 3 on the surface of the capillary structure 12 in a flat manner, and the holding reinforcement member 3 can also be arranged inside a single-layer capillary structure 12 in a framework manner, the holding reinforcement member 3 is covered by the capillary structure 12, or a plurality of layers of capillary structures 12 or multiple types of composite capillary structures 12 are selected to insert or stack the holding reinforcement member 3 therein in a stacking manner to combine them into a whole, or the holding reinforcement member 3 is arranged on the surface of the airtight chamber 11 of the body 1 and then the capillary structure 12 is arranged, so that the holding reinforcement member 3 provides more stable strength and supporting reinforcement for fastening on the wall surface of the chamber, thereby preventing the capillary structure 12 from being damaged and brittle fracture when the body 1 is subjected to stress concentration due to bending or twisting, which leads to reduction or incapability of capillary efficiency.

The scheme is mainly that when the body 1 is subjected to bending deformation, the fixed strengthening piece 3 is arranged on the internal capillary structure 12 of the part which is easy to generate stress concentration in the bending deformation for strengthening and reinforcing, the part which is easy to generate stress concentration in the body 1, the bent part, the part which is excessively extended or extended, the corner part after extrusion and the like can eliminate the stress concentration of the body 1 by processing in a mode of a guide angle or a guide fillet, and the internal capillary structure 12 cannot be arranged in the way, so the strength of the capillary structure 12 is enhanced by combining the fixed strengthening piece 3 with the capillary structure 12 of the part, and the existing defects are improved.

Claims

1. A heat pipe structure, comprising:

2. A heat pipe structure according to claim 1, wherein: the stress concentration area is arranged at one of a deformed part of the body, a secondary processing part after forming or a bending and bending deformation part.

3. A heat pipe structure according to claim 1, wherein: the capillary structure is a plurality of grooves, sintered powder bodies or grid bodies, and the holding strengthening piece is covered on the surface of the capillary structure which is combined with the corresponding stress concentration area of the airtight chamber or embedded in the capillary structure.

4. A heat pipe structure according to claim 1, wherein: the body, the capillary structure and the holding and strengthening piece are made of any one material of copper, aluminum, stainless steel, titanium alloy and aluminum alloy, and the body, the capillary structure and the holding and strengthening piece are made of the same or different materials.

5. A heat pipe structure according to claim 1, wherein: the working fluid is any one of acetone, pure water and alcohol.