JP2012184875A - Plane type heat pipe structure and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plane type heat pipe structure and a method of manufacturing the same, for improving a yield, by strengthening bearing power of a plane type heat pipe.SOLUTION: The plane type heat pipe structure includes a pipe body 11, a thin piece body 12 and at least one projecting column 13. The pipe body 11 is a cross-sectional flat shape, and includes a storage space 111 having a first side part 1111 and a second side part 1112. The storage space 111 is formed by respectively continuously connecting the first closing end 112 and the second closing end 113 to both end parts, and has a working liquid 2 inside. The thin piece body 12 has a first drawing part 12a and a second drawing part 12b, and is arranged in the storage space 111 of the pipe body 11. The first drawing part 12a and the second drawing part 12b are continuously connected while crossing with each other, and define a plurality of boxes 121. The projecting column 13 is fixed in the boxes 121 selected on the thin piece body 12 by a sintered powder body, or is arranged in the whole boxes 121.

Description

  The present invention relates to a planar heat pipe structure and a manufacturing method thereof, and more particularly, to a planar heat pipe structure and a manufacturing method thereof that enhance the supporting force of the planar heat pipe and improve the yield.

  Cooling or heat dissipation is always a big problem for the development of the electronics industry. As the demands for performance, integration and functionality increased, so did the demand for improved heat dissipation performance. Therefore, research and development on heat exchange efficiency has become an important issue.

  A heat sink is used to release heat generated by an electronic device or system into the air. When the thermal resistance is small, the heat dissipation efficiency of the radiator is high. The thermal resistance includes thermal conductivity inside the radiator and convection resistance generated between the radiator surface and air. The thermal conductivity can be lowered by a radiator manufactured from a material with high thermal conductivity such as copper or aluminum, but the convection resistance deteriorates the characteristics of the radiator. The request could not be fulfilled.

  Currently, heat sinks with higher heat dissipation efficiency, such as flat heat pipes and vapor chambers, are attracting attention in the market, and they can be used in combination with other heat sinks to solve current heat dissipation problems. ing.

  In the conventional planar heat pipe structure, a hollow portion in the planar heat pipe is filled with metal powder, and a capillary structure is formed on the inner wall of the planar heat pipe by sintering. Further, a capillary structure can be formed by arranging a metal mesh in the hollow portion. Next, the inside of the flat heat pipe is evacuated and filled with a working liquid to be sealed. Since the conventional planar heat pipe structure has no support structure, it may be recessed or thermally expanded. When pressure is applied to the planar heat pipe structure, the internal capillary structure (sintered metal powder) may be destroyed and peeled off from the inner wall. Therefore, the thermal conductivity of the planar heat pipe structure has been greatly reduced. In addition, since the planar heat pipe has only a capillary structure and a hollow metal mesh on the inner wall of the chamber, when the working liquid is condensed from gas to liquid, gas and liquid circulation is performed by gravity and capillary return on the wall surface. The liquid circulation efficiency was very poor.

  Patent Document 1 discloses a vapor chamber and a support structure. The vapor chamber has a cover and a capillary structure and a support structure housed inside the cover. The support structure includes a plate body having a plurality of grooves arranged at intervals. A wave piece is formed in each groove. The upper and lower ends of the wave piece respectively press the capillary structure to bring the capillary structure and the inner wall of the cover into contact with each other. By arranging the wave pieces in the hollow part of the vapor chamber, it was possible to prevent the sintered powder from being pressed and dent, or to increase the amount of gas phase change and accelerate the heat conduction speed, It was not possible to assist the reflux of the working liquid or to improve the capillary effect.

  As described above, the conventional vapor chamber and support structure have three drawbacks. 1. Yield was bad. 2. Gas-liquid circulation was poor. 3. Support structure was weak.

JP 2009-180437 A JP 2004-53186 A Taiwan Patent No. M336673

A first object of the present invention is to provide a planar heat pipe structure that realizes acceleration of heat conduction speed, enhancement of supporting force, and improvement of capillary effect.
The second object of the present invention is to provide a method for manufacturing a planar heat pipe structure that improves the yield and reduces the cost.

In order to achieve the above object, the present invention provides a planar heat pipe structure and a manufacturing method thereof. The planar heat pipe structure of the present invention includes a tube, a thin piece, and at least one convex column. The tubular body has a flat cross section and is provided with a storage space having a first side and a second side. The storage space has a first closed end and a second closed end connected to both ends, respectively, and has working liquid therein. The thin piece body has a first extending portion and a second extending portion, and is disposed in the storage space of the tubular body. The first extending portion and the second extending portion are connected to each other while crossing each other to define a plurality of cells. The convex column is made of a sintered powder body, and is fixed in the grid selected on the thin piece body or arranged in all the grids. The ends of both of the convex columns are connected to the first side and the second side, respectively.

The planar heat pipe structure and the manufacturing method thereof according to the present invention not only greatly increase the support strength of the planar heat pipe structure by providing a convex column, but also improve the internal gas-liquid circulation efficiency and operate. The liquid can be refluxed from the convex column and the heat conduction efficiency can be improved. Moreover, the thermal resistance phenomenon can be prevented by strengthening the coupling between the convex column and the tubular body using diffusion bonding.

1 is an exploded perspective view showing a planar heat pipe structure according to a first embodiment of the present invention. It is another exploded perspective view which shows the planar heat pipe structure by the 1st Embodiment of this invention. It is sectional drawing which shows the planar heat pipe structure by the 1st Embodiment of this invention. It is sectional drawing which shows the planar heat pipe structure by the 2nd Embodiment of this invention. It is sectional drawing which shows the planar heat pipe structure by the 3rd Embodiment of this invention. It is sectional drawing which shows the planar heat pipe structure by the 4th Embodiment of this invention. It is sectional drawing which shows the planar heat pipe structure by the 5th Embodiment of this invention. It is sectional drawing which shows the planar heat pipe structure by the 6th Embodiment of this invention. It is a perspective view which shows the thin piece body of the planar heat pipe structure by the 7th Embodiment of this invention. It is a flowchart which shows the manufacturing method of the planar heat pipe structure by the 1st Embodiment of this invention. It is a flowchart which shows the manufacturing method of the planar heat pipe structure by the 3rd Embodiment of this invention. It is sectional drawing which shows the manufacturing method of the planar heat pipe structure by the 1st Embodiment of this invention. It is sectional drawing which shows the manufacturing method of the planar heat pipe structure by the 1st Embodiment of this invention. It is sectional drawing which shows the manufacturing method of the planar heat pipe structure by the 2nd Embodiment of this invention. It is sectional drawing which shows the manufacturing method of the planar heat pipe structure by the 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  Please refer to FIGS. FIG. 1 is an exploded perspective view showing a planar heat pipe structure according to a first embodiment of the present invention. FIG. 2 is another exploded perspective view showing the planar heat pipe structure according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view showing a planar heat pipe structure according to the first embodiment of the present invention. As shown in FIGS. 1 to 3, the planar heat pipe structure 1 of the present invention includes a tube body 11, a thin piece body 12, and at least one convex column 13.

  The tubular body 11 has a flat cross section, and a storage space 111 is provided between the first side portion 1111 and the second side portion 1112. The storage space 111 is provided with a first closed end 112 and a second closed end 113 at both ends, respectively, and is filled with the working liquid 2.

  The thin piece body 12 has a first extending portion 12 a and a second extending portion 12 b, and is disposed in the storage space 111 of the tube body 11. The first extending portion 12a and the second extending portion 12b are connected while intersecting each other to define a plurality of grids 121.

  The convex column 13 is a sintered powder body, and is fixed in the selected cell 121 of the thin piece 12 or is disposed in all the cells 121 (see FIG. 2). Both end portions of the convex column 13 are connected to the first side portion 1111 and the second side portion 1112, respectively.

  The shape of the convex column 13 can be changed as necessary, and can be increased or decreased, or can be concentrated in a part of the thin piece body 12.

  Please refer to FIG. FIG. 4 is a sectional view showing a planar heat pipe structure according to the second embodiment of the present invention. As shown in FIG. 4, since the second embodiment is almost the same as the first embodiment, only different parts will be described. The convex column 13 further has at least one groove 131 on the outer edge.

  Please refer to FIG. FIG. 5 is a sectional view showing a planar heat pipe structure according to the third embodiment of the present invention. As shown in FIG. 5, since the third embodiment is almost the same as the first embodiment, only different parts will be described. The convex column 13 is a copper column.

  Please refer to FIG. FIG. 6 is a sectional view showing a planar heat pipe structure according to the fourth embodiment of the present invention. As shown in FIG. 6, since the fourth embodiment is almost the same as the third embodiment, only different parts will be described. The convex column 13 further includes at least one groove 132 on the outer edge.

  Please refer to FIG. FIG. 7 is a sectional view showing a planar heat pipe structure according to the fifth embodiment of the present invention. As shown in FIG. 7, since the fifth embodiment is almost the same as the third embodiment, only different parts will be described. The convex column 13 has a sintered powder ring body 133 on the outer edge.

  Please refer to FIG. FIG. 8 is a sectional view showing a planar heat pipe structure according to the sixth embodiment of the present invention. As shown in FIG. 8, since the sixth embodiment is almost the same as the fifth embodiment, only different parts will be described. The sintered powder ring body 133 has at least one groove 1331.

  Please refer to FIG. FIG. 9 is a perspective view showing a thin piece body of a planar heat pipe structure according to a seventh embodiment of the present invention. As shown in FIG. 9, since the seventh embodiment is almost the same as the first embodiment, only different parts will be described. The first extending portion 12a is an arc-shaped protrusion having a passage 12c on the inner edge.

  In each of the above-described embodiments, by providing the convex column 13, not only the support strength of the planar heat pipe structure 1 is greatly increased, but also the internal gas-liquid circulation efficiency is further increased, and the working liquid 2 is convex. It can be refluxed from the column 13 to accelerate the heat conduction efficiency.

Please refer to FIG. 10, FIG. 12, and FIG. FIG. 10 is a flowchart showing a method for manufacturing a planar heat pipe structure according to the first embodiment of the present invention.
FIG. 12 is a cross-sectional view showing a method for manufacturing a planar heat pipe structure according to the first embodiment of the present invention. FIG. 13 is a cross-sectional view showing a method for manufacturing a planar heat pipe structure according to the first embodiment of the present invention. As shown in FIGS. 10, 12 and 13, the method for manufacturing the planar heat pipe structure 1 includes a first step S1 and a second step S2.

  In the first step S1, a thin piece body having a tube having a flat cross section and a plurality of grids and convex columns is prepared. A thin piece body (thin piece body 12) having a prepared tubular body having a flat cross section (tube body 11) and a plurality of cells (cells 121) and a convex column (convex column 13). In this embodiment, the copper material is used, which is either copper or aluminum material or one having high heat conduction efficiency, but the present invention is not limited to this. The convex column 13 is a sintered powder body, and is pressed into the grid 121 of the thin piece body 12 using a press die 31 and a punch 32 by a pressing method that is machining, and is bonded to the thin piece body 12.

  In the second step S2, a thin piece body is disposed in a tubular body having a flat cross section, and the thin piece body is sealed. In short, the thin piece body (thin piece body 12) and the convex column (convex column 13) are arranged in the tube body (tube body 11), and the thin piece body (thin piece body 12) is sealed.

Please refer to FIG. 10, FIG. 14 and FIG. FIG. 14 is a cross-sectional view showing a method of manufacturing a planar heat pipe structure according to the second embodiment of the present invention. FIG. 15 is a cross-sectional view illustrating a method of manufacturing a planar heat pipe structure according to the second embodiment of the present invention. As shown in FIGS. 10, 14, and 15, the method for manufacturing the planar heat pipe structure 1 includes a first step S <b> 1 and a second step S <b> 2.

  In the first step S1, a tube having a flat cross section, and a thin piece having a plurality of grids and convex columns are prepared. The prepared tubular body having a flat cross section (tubular body 11), and a thin piece body (thin piece body 12) having a plurality of cells (cells 121) and a convex column (convex column 13). In the present embodiment, a copper material is used, which is either an aluminum material or one having high heat conduction efficiency, but the present invention is not limited to this. The convex column 13 is a sintered powder body. The metal powder 4 and the thin piece body 12 are bonded together by sintering. In the sintering process, the metal powder 4 is filled in the portion to be sintered and formed on the convex column 13, and when the metal powder 4 is pressed and sintered, the convex column 13 is formed and joined to the thin piece body 12 (FIG. 13 and 14).

  Since 2nd process S2 of 2nd Embodiment is the same as that of 1st Embodiment, description is abbreviate | omitted.

  In the thin piece body 12 in the first embodiment and the second embodiment, the grid 121 is also formed by pressing.

Please refer to FIG. 1, FIG. 2 and FIG. FIG. 11 is a flowchart showing a method for manufacturing a planar heat pipe structure according to the third embodiment of the present invention. As shown in FIGS. 1, 2 and 11, the method for manufacturing the planar heat pipe structure 1 includes a first step S1 and a second step S2.

  Since the first step S1 and the second step S2 of the third embodiment are almost the same as those of the first embodiment, only different portions will be described. After the second step S2, a third step S3 was added. In the third step S3, a diffusion bonding step is performed on the convex column and the tube having a flat cross section.

  By tightly coupling the convex column 13 and the tubular body 11 using diffusion bonding, the coupling between the convex column 13 and the tubular body 11 is strengthened, and the heat conduction resistance is reduced.

  Although preferred embodiments of the present invention have been disclosed as described above, they are not intended to limit the present invention in any way, and anyone skilled in the art is within the spirit and scope of the present invention. Various changes and modifications can be made. Therefore, the scope of protection of the present invention is based on the contents specified in the claims.

DESCRIPTION OF SYMBOLS 1 Planar type heat pipe structure 2 Working liquid 4 Metal powder 11 Tubular body 12 Thin piece body 12a First extending part 12b Second extending part 12c Passage 13 Convex pillar 31 Pressing die 32 Punch 111 Storage space 112 First closing End 113 second closed end 121 cell 131 groove 132 groove 133 sintered powder ring 1111 first side 1112 second side 1331 groove S1 step 1
S2 Process 2
S3 Step 3

Claims (13)

A storage space is formed between the flat first side portion and the second side portion, the first closed end and the second closed end are coupled to both ends of the storage space, respectively, and the working liquid is contained therein. The first and second extending portions that define a plurality of grids are connected to each other by extending and connecting to a tube having a flat cross section filled with A thin flake body,
At least one convex column fixed in the grid of the thin piece body and having both end portions joined to the first side portion and the second side portion;
A planar heat pipe structure characterized by comprising: The planar heat pipe structure according to claim 1, wherein the convex column is a copper column. The planar heat pipe structure according to claim 1, wherein the convex column is a copper column further having at least one groove on an outer edge. The planar heat pipe structure according to claim 1, wherein the convex column is a sintered powder body. The planar heat pipe structure according to claim 1, wherein the convex column is a copper column having a sintered powder ring at an outer edge.   The planar heat pipe structure according to claim 1, wherein the convex column is a sintered powder body having at least one groove on an outer edge.   The planar heat pipe structure according to claim 1, wherein the convex column is disposed in each square.   The planar heat pipe structure according to claim 1, wherein the first extending portion is an arc-shaped protrusion having a passage at an inner edge. Preparing a thin piece body having a tube having a flat cross section and a plurality of grids and convex columns; and
A method of manufacturing a planar heat pipe structure, comprising: a step 2 of disposing the thin piece body in the tubular body having a flat cross section and sealing the thin piece body. The method for manufacturing a planar heat pipe structure according to claim 9, wherein the convex column is bonded to the thin piece body by a pressing method. The method for manufacturing a planar heat pipe structure according to claim 9, wherein the convex column is molded on the thin piece body by powder sintering. The method for manufacturing a planar heat pipe structure according to claim 9, wherein the thin piece is formed by pressing a plurality of squares.   The step 2 for disposing the thin piece body in the tubular body having a flat cross section and sealing the thin piece body further includes a step 3 for increasing the degree of coupling between the convex column and the flat cross section tubular body by diffusion bonding. The method for manufacturing a planar heat pipe structure according to claim 9.

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