JP2018040555A - Heat pipe and sealing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pipe capable of improving efficiency of work such as bending of a pipe body, pressing of the pipe body and testing, capable of prolonging the length of a metal pipe body, and capable of improving heat conductivity, and also provide a sealing method thereof.SOLUTION: A sealing method of a heat pipe includes the steps of: providing a throttle opening extending from one end of a metal pipe body whose other end has a closed end and having a passage therein; moving a pressing mold in a direction separate from the metal pipe body with the throttle opening pressed by the pressing mold, and crimping and elongating the throttle opening, thereby forming a crimped and elongated column and sealing the passage; and sealing the crimped and elongated column with spot welding, thereby forming a sealing part at a tip part of the crimped and elongated column.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a heat dissipation structure, and more particularly to a heat pipe and a sealing method thereof.

  The heat pipe is a sealed cavity in which a working fluid is filled. Heat is transferred so that the surface of the cavity is quickly soaked by a cycle in which the working fluid absorbs and dissipates heat and changes into a gas-liquid two-phase. In addition, the heat pipe is one of important heat dissipation parts because it has advantages such as small size, light weight, and design that can be designed according to the position of the heat source.

  As a conventional heat pipe sealing method, one end of a metal tube is sealed and the other end is opened, the inside of the metal tube is covered with a capillary structure through the opening, and a working fluid is filled. A method of forming a sealing head B by performing a deaeration operation and finally welding and sealing the opening of the heat pipe A as shown in FIG. 1 is known.

  However, since the sealing head B is large, it has the following drawbacks. First, during the operation of bending the heat pipe A, the sealing head B must be disposed horizontally. If the heat pipe B is pressed without arranging the sealing head B horizontally, the sealing head B is easily cracked and discarded. Further, when the sealing head B is collided during operations such as pipe bending, pressing, and testing, it tends to bend and is discarded.

  An object of this invention is to provide the heat pipe which eliminates such a conventional problem, and its sealing method.

  In order to solve the above-mentioned problem, a heat pipe sealing method according to the present invention includes a step a in which a throttle port portion extending from the other end of a metal tube having a closed end at one end and having a passage inside is provided. The pressing die is moved in a direction away from the metal tube while pressing the throttle port portion with a pressing die, and the throttle port portion is crimped and stretched to form a crimping extension column and the passage A step b, and a step c of forming a sealing portion at the tip of the crimp extension column by spot welding the seal extension column.

  In addition, the heat pipe according to the present invention has a sealed space inside, a closed end at one end and a crimp extension column at the other end, and a tip end portion of the crimp extension column is sealed by a sealing portion. And a capillary structure provided so as to cover the inner wall of the metal tube, and a working fluid filled in the sealed space.

  In the heat pipe sealing method according to the present invention, one end of the heat pipe is crimped and extended with a pressing die to form a crimp extension column to perform the first sealing, and the tip of the crimp extension column is further attached. Spot welding is performed to form a sealing portion, and second sealing is performed. Thereby, compared with the sealing head of the conventional heat pipe, the crimping | extension column and sealing part of this invention can be reduced in size, and also hardness can be improved. As a result, the efficiency of work such as bending of the pipe of the heat pipe, pressing and testing of the pipe can be improved, and the length of the metal pipe can be increased. Can be increased.

Furthermore, the heat pipe of the present invention has the following advantages.
1) By moving the pressing mold in a direction away from the metal tube while pressing the throttle opening with the pressing mold, the throttle opening is crimped and expanded to be deformed into a crimping extension column. When this crimping extension column receives a pressing force and a tensile force in a direction away from the metal tube, the passage is reliably sealed from the bottom to the top of the crimping extension column. As a result, the sealing performance of the heat pipe can be improved.
2) When the crimping extension column is sealed by spot welding, a sealing portion is formed at the tip of the crimp extension column. This sealing part is formed by melting the tip part of the crimping extension column. For this reason, the sealing part and the crimping extension column are integrally molded and have the same thermal expansion coefficient, so that cracking of the sealing part and the crimping extension column due to thermal expansion and contraction can be suppressed. The length can be shortened. Thereby, the length of the invalid end (crimp extension pillar and sealing part) of a heat pipe can be shortened, and the length of the effective end (metal tube) of a heat pipe can be lengthened.
3) The crimping extension column is deformed into a prism such as a triangular column, a quadrangular column, a pentagonal column, or a hexagonal column by being pressed and extended. Thereby, a crimping | compression-bonding extension column will have a some corner | angular part, and has the advantage which raises the structural intensity | strength of a crimping | stretching extension column, and suppresses the bending of a crimping extension column.

It is a figure which shows sealing of the conventional heat pipe. It is a flowchart which shows the procedure of the sealing method of the heat pipe which concerns on one Embodiment of this invention. It is a figure which shows the state which the press metal mold | die of one Embodiment of this invention tends to press an aperture part. It is a figure which shows the state which the press metal mold | die of one Embodiment of this invention moves in the direction away from a metal pipe body. It is a figure which shows the state deform | transformed into the crimping | compression-bonding extension pillar by the crimping | compression-bonding extension of one Embodiment of this invention being crimped | compressed and extended. It is a figure which shows the operation | work which carries out spot welding and seal | stickers the crimping | compression-bonding extension column of one Embodiment of this invention. It is a perspective view which shows the heat pipe which concerns on one Embodiment of this invention. It is sectional drawing which shows the heat pipe which concerns on one Embodiment of this invention. It is another perspective view which shows the heat pipe which concerns on one Embodiment of this invention. It is a perspective view which shows the crimping | compression-extension pillar of other embodiment of this invention.

  The technical contents and detailed description of the present invention will be described below with reference to the drawings. However, the drawings are only for reference and explanation, and do not limit the present invention.

  As shown in FIGS. 2 to 10, the present invention relates to a heat pipe and a sealing method thereof. The heat pipe 10 according to the present embodiment mainly includes a metal tube body 1, a capillary structure 2, and a working fluid.

Hereinafter, a method for sealing the heat pipe will be described.
First, as shown in step a of FIG. 2 and FIG. 3, a throttle port portion 12 extending from the other end of the metal tube having a closed end 11 at one end is provided. The inside of the throttle opening 12 has a passage 121. The outer diameter d1 of the metal tube 1 is formed larger than the outer diameter d2 of the throttle port portion 12.

  FIG. 4 is a diagram illustrating a state in which the pressing mold according to the embodiment of the present invention moves in a direction away from the metal tube. As shown in FIG. 4, in step a, the capillary structure 2 is provided so as to cover the inner wall of the metal tube 1. The capillary structure 2 is composed of a group consisting of a particle sintered body, a metal mesh body, an etching groove, or a combination thereof.

  In addition, the method for sealing the heat pipe 10 according to the present embodiment further includes a step b ′ of vacuuming the metal tube 1 after filling the metal tube 1 with the working fluid before the step b.

  Next, as shown in step b of FIG. 2 and FIGS. 4 to 6, the pressing die 100 is moved in a direction away from the metal tube 1 while pressing the throttle opening 12 with the pressing die 100. As a result, the throttle opening 12 is crimped and extended to form the crimping extension column 13 and the passage 121 is sealed.

  Here, as shown in FIGS. 4 to 8 and 10, the pressing mold 100 includes two half molds 101. A half pressing groove 102 is provided on one side of each half mold 101. By pressing the two half-pressing grooves 102 against both sides of the throttle opening 12 so as to sandwich the throttle opening 12, the throttle opening 12 is pressed from the periphery. Each half-pressing groove 102 may be formed in a half-polygonal groove obtained by halving a polygon such as a triangle, a quadrangle, a pentagon, or a hexagon. Thereby, the crimping | stretching extension pillar 13 is formed in prismatic pillars, such as a triangular prism, a quadratic prism, a pentagonal prism, or a hexagonal prism, by being press-extended.

  Each semi-pressing groove 102 may be formed as a semicircular arc groove having a half circular shape. Thereby, the crimping | compression-bonding extension pillar 13 is formed in a cylinder or an elliptical pillar by being press-extended.

  Next, as shown in step c of FIG. 2 and FIGS. 6 to 8, the crimping extension column 13 is spot welded and sealed, thereby forming a sealing portion 131 at the tip of the crimping extension column 13. . Thus, the heat pipe 10 according to the present embodiment can be completed by steps a to c. Finally, as shown in FIG. 9, the heat pipe 10 is pressed. The outer diameter d3 of the crimping extension column 13 is formed smaller than the outer diameter d4 of the sealing portion 131. That is, the outer diameter d1 of the metal tube 1 is formed larger than the outer diameter d3 of the crimping extension column 13, and the outer diameter d3 of the crimping extension column 13 is formed smaller than the outer diameter d4 of the sealing portion 131. Yes.

  The sealing portion 131 is formed by melting the tip end portion of the crimping extension column 13. For this reason, the sealing part 131 and the crimping | compression-bonding extension pillar 13 are integrally molded with the same material. Examples of the spot welding operation include an electron beam welding method, a TIG (TIG) welding method, and a laser welding method.

  The heat pipe 10 according to the present embodiment includes a metal tube body 1 in which a sealed space s is provided. The metal tube 1 has a closed end 11 at one end and a crimp extension column 13 at the other end. A sealing portion 131 is provided at the distal end portion of the crimping extension column 13. The capillary structure 2 is provided so as to cover the inner wall of the metal tube 1. The sealed space s of the metal tube body 1 is filled with a working fluid. Here, one end of the metal tube 1 is crimped and extended with the pressing mold 100 to form the crimping extension column 13 to perform the first sealing, and further, the tip of the crimping extension column 13 is spot-welded. A sealing portion 131 is formed to perform second sealing. Thus, since the tip end portion of the crimping extension column 13 is sealed, the welding area necessary for the tip portion of the crimping extension column 13 can be reduced, and the heat pipe 10 has excellent adhesion at the sealed portion. The advantage of lower costs is obtained.

  Further, the pressing die 100 is moved in a direction away from the metal tube 1 while pressing the throttle port portion 12 with the pressing die 100, whereby the throttle port portion 12 is crimped and extended to form the crimping extension column 13. . The crimping extension column 13 receives the pressing force and the tensile force in the direction away from the metal tube 1, so that the passage 121 is reliably sealed from the bottom to the top. As a result, the sealing performance of the heat pipe 10 can be improved.

Further, when the crimping extension column 13 is sealed by spot welding, a sealing portion 131 is formed at the tip of the crimping extension column 13. This has the following advantages.
1) Compared to a conventional heat pipe sealing head, the crimping extension column 13 and the sealing portion 131 according to this embodiment are formed in a small size, and therefore, when the metal tube 1 is bent, the crimping extension column 13 and the sealing portion 131 are sealed. The orientation of the stop 131 is free. Thus, the working efficiency of tube bending can be improved.
2) The crimping extension column 13 is crimped and stretched and spot welded. Since the crimping extension column 13 and the sealing portion 131 eliminate or reduce the gap between them by crimping extension, the hardness of the crimping extension column 13 and the sealing portion 131 can be made higher than the sealing head of the conventional heat pipe. . As a result, even if the tube collides during operations such as bending the tube, pressing and testing the tube in post-processing, the crimping extension column 13 and the sealing portion 131 are not easily bent and discarded. Can be suppressed.
3) When the length of the heat pipe 10 according to the present embodiment is the same as the length of the conventional heat pipe, the length of the crimp extension 13 and the sealing portion 131 is longer than the length of the sealing head of the conventional heat pipe. Therefore, the length of the metal tube 1 can be increased, and the thermal conductivity of the heat pipe 10 can be increased.

  The sealing part 131 is formed by melting the tip part of the crimping extension column 13. For this reason, the sealing part 131 and the crimping extension column 13 are integrally molded and have the same thermal expansion coefficient, and cracking of the sealing part 131 and the crimping extension column 13 due to thermal expansion and contraction can be suppressed. Further, since the sealing portion 131 is formed by melting the tip end portion of the crimping extension column 13, the length of the crimping extension column 13 can be shortened. Thereby, the length of the invalid end (the crimping | compression-bonding extension pillar 13 and the sealing part 131) of the heat pipe 10 can be shortened, and the length of the effective end (metal pipe body 1) of the heat pipe 10 can be lengthened.

  The crimping extension column 13 is deformed into a prism such as a triangular column, a quadrangular column, a pentagonal column, or a hexagonal column by being pressed and extended. For this reason, the crimping extension column 13 has a plurality of corners. Along with this, the structure of the corner portion is thicker than the side structure and protrudes, and when the crimping extension column 13 receives an impact, the stress tends to concentrate on the corner portion, that is, deformation is concentrated on the corner portion. Therefore, it is possible to prevent the occurrence of wide deformation such as side deformation. Thereby, the structural strength of the crimping extension column 13 can be increased, and the folding of the crimping extension column 13 can be suppressed.

  In summary, the heat pipe and the sealing method thereof according to the present invention are not found in similar products, are not publicly used, and have industrial applicability, novelty and inventive step. Therefore, it completely satisfies the patent requirements and applies for a patent under the Patent Law. The examiner hopes that this case will be patented after detailed examination to ensure the rights of the inventor.

<Conventional technology>
A Heat pipe B Sealing head <Invention>
DESCRIPTION OF SYMBOLS 10 Heat pipe 1 Metal pipe body 11 Closed end 12 Restriction opening part 121 Passage 13 Crimp extension pillar 131 Sealing part 2 Capillary structure 100 Pressing die 101 Half die 102 Half pressing groove d1, d2, d3, d4 Outer diameter s Sealed space

Claims (10)

A heat pipe sealing method,
Providing a throttle opening extending from the other end of the metal tube having a closed end at one end and having a passage inside;
The pressing die is moved in a direction away from the metal tube while pressing the throttle port portion with a pressing die, and the throttle port portion is crimped and elongated to form a crimping extension column and the passage. Sealing step b;
And a step c of forming a sealing portion at a tip of the crimping extension column by spot welding the crimping extension column and sealing it.   2. The heat pipe sealing method according to claim 1, wherein in the step c, the sealing portion is formed by melting a tip end portion of the crimping extension column. 3. In the step b, the pressing mold includes two half molds,
A half pressing groove is provided on one side of each of the half molds,
2. The heat pipe sealing method according to claim 1, wherein the throttle opening is pressed by abutting inner walls of the two half-pressing grooves to both sides of the throttle opening.   4. The heat pipe sealing method according to claim 3, wherein each of the half-pressing grooves is formed in a half-polygonal groove, and the crimping extension column is formed in a rectangular column. 5.   4. The heat pipe sealing method according to claim 3, wherein each of the half-pressing grooves is formed in a semicircular arc-shaped groove, and the crimping extension column is formed in a cylinder or an elliptical column.   2. The heat pipe sealing according to claim 1, wherein in step c, the tip end portion of the crimp extension column is spot welded and sealed using an electron beam welding method, a TIG welding method, or a laser welding method. Method. In the step a, a capillary structure is provided so as to cover the inner wall of the metal tube,
The capillary structure is composed of a group consisting of a particle sintered body, a metal mesh body, an etching groove or a combination thereof,
The metal tube has a larger outer diameter than the throttle port,
2. The heat pipe sealing method according to claim 1, wherein, in the step c, the crimp extension pillar has an outer diameter smaller than that of the throttle port. 3. A heat pipe,
A metal tube having a sealed space inside, a closed end at one end and a crimp extension column at the other end, and a sealing portion formed at the tip of the crimp extension column;
A capillary structure provided so as to cover the inner wall of the metal tube;
And a working fluid filled in the sealed space. The sealing part and the crimping extension column are integrally formed of the same material,
The metal tube has a larger outer diameter than the crimp extension column,
The crimping extension column has a smaller outer diameter than the sealing portion,
The heat pipe according to claim 8, wherein the capillary structure is composed of a group consisting of a particle sintered body, a metal mesh body, an etching groove, or a combination thereof. The heat pipe according to claim 8, wherein the crimp extension column is a cylinder, an elliptic column, or a prism.