JP2000216305A - Heat sink, its using method, and its manufacturing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat sink for a heating body whose cross-sectional perim eter is circular and which is easy to manufacture and install. SOLUTION: At both ends of a plate 2, a pair of clamping flanges 1 matching each other is raised. A corrugated fin 3 is provided on the surface of plate 2 between the pair of clamping flanges 1, with the corrugated fin 3 brazed/fixed to the plate 2 to form a plate heat sink 4. Then the plate sink 4 is wound around a cylinder or column to constitute a cylindrical heat sink.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sink for cooling a power semiconductor or the like, the heat sink having a circular outer periphery.

[0002]

2. Description of the Related Art Although a heat generating portion has a circular outer periphery, a heat sink has a large number of fins formed directly on the outer periphery thereof.
Cooling was performed by natural cooling or forced air.

[0003]

It is not economical to directly form a fin or the like on a heat-generating portion having a circular cross-sectional periphery, because it requires a lot of man-hours and many materials for its production. Therefore, an object of the present invention is to provide a heat sink which can be easily attached to various heating elements having a circular outer cross section and which can be easily manufactured, a method of using the heat sink, and a method of manufacturing the same.

[0004]

According to the first aspect of the present invention, there is provided a flat plate 2 having a pair of fastening flanges 1 standing up at both ends thereof, and a wave propagating direction of the pair. The corrugated fins 3 are disposed in the direction of separation of the fastening flanges 1, the tops or the valleys of the flat plate 2 come into contact with the surface of the flat plate 2, and the contact portions are brazed and fixed. A heat sink 4 is formed, and the flat heat sink 4 is wound around the outer periphery of a cylindrical body or a columnar body with the traveling direction of the wave of the corrugated fin 3 positioned in the circumferential direction to form the cylindrical heat sink 5. A heating element 6 having a circular cross section and having a circular outer periphery is arranged in the cylindrical heat sink 5, and a pair of the fastening flanges 1 is fastened and fixed by fasteners 7. It is a heat sink.

According to a second aspect of the present invention, there is provided the heat sink according to the first aspect, wherein the cylindrical body or the cylindrical body is the heating element 6 itself. According to a third aspect of the present invention, there is provided the heat sink according to the first or second aspect, wherein the pair of fastening flanges 1 are formed with bolt holes 8 which are aligned with each other. According to a fourth aspect of the present invention, in the third aspect, both sides of the fastening flange 1 in the width direction are arranged outside the both sides of the corrugated fin 3 in the width direction, and both sides of the respective fastening flanges 1 are provided. This is a heat sink provided with bolt holes 8.

According to a fifth aspect of the present invention, a pair of fastening flanges 1 aligned on both ends are provided on a surface of a flat plate 2 on which a pair of fastening flanges 1 are raised. And a step of manufacturing a flat heat sink 4 for contacting the top or valley outer surface of each of the corrugated fins 3 and brazing and fixing the contact portions. A step of wrapping the flat heat sink 4 around the outer periphery of a cylindrical or columnar heating element 6 to be cooled in a circumferential direction, and fastening and fixing the pair of fastening flanges 1 with a fastener 7; This is a method for using a heat sink having:

According to a sixth aspect of the present invention, there is provided a flat plate 2 having a pair of fastening flanges 1 aligned with each other at both ends thereof, the surface of a flat plate 2 being provided with a wave traveling direction. A flat heat sink 4 manufacturing step of contacting the top or valley outer surface of each of the corrugated fins 3 and brazing and fixing the contact portions;
Manufacturing process of a tubular heat sink 5 in which the direction of propagation of the waves of the corrugated fins 3 is located in the circumferential direction, and the flat heat sink 4 is wound around the outer periphery of a cylindrical or cylindrical plastic deformation member to be plastically deformed into a cylindrical shape. This is a method for manufacturing a heat sink having:

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a first manufacturing step of the heat sink of the present invention, FIG. 2 is a front view of a main part thereof, and FIG. 3 is a perspective view showing the second step. In the heat sink of this embodiment, first, a flat heat sink 4 shown in FIG. 1 is formed, which is wound around the outer periphery of a heating element 6 as shown in FIG. It is used as a heat sink 5. The flat heat sink 4 includes a flat plate 2 and a corrugated fin 3 placed on the flat plate 2.
And The plate 2 has fastening flanges 1 erected at right angles at both ends in the longitudinal direction. The width of the fastening flange 1 is wider than other portions. Then, bolt holes 8 are provided on both of the widened side portions, and the bolt holes 8 of the pair of fastening flanges 1 are aligned with each other.
Note that a screw hole may be formed in one inner circumference of the pair of bolt holes 8 aligned with each other, and the other bolt hole 8 may be formed slightly larger than the diameter of the screw hole. Thereby, the nut can be omitted.

Next, in this example, the corrugated fins 3 are placed in the longitudinal direction of the plate 2 so that the traveling direction of the waves is located in the longitudinal direction of the plate 2. And the contact portion is brazed and fixed. As a brazing method, at least one surface of the plate 2 and the corrugated fin 3 is covered with a brazing material, or a brazing foil is interposed between the two.
The plate 2 and the corrugated fin 3 can be integrally brazed and fixed as shown in FIG. 2 by inserting the combination into a high-temperature furnace, melting the brazing material and then solidifying it. In this example, the thickness of the plate 2 is significantly larger than that of the corrugated fin 3. The plate 2 and the corrugated fin 3 are made of a metal material. For example, an aluminum plate, a copper plate, a stainless steel plate or the like can be used.

In this example, the flat heat sink 4 thus completed is directly wound around the outer periphery of the heating element 6, and a bolt (including a screw, the same applies hereinafter) is inserted into the bolt hole 8, and
What is necessary is just to screw a nut to the tip and fasten and fix between the fastening flanges 1. Thereby, the flat heat sink 4
Becomes the cylindrical heat sink 5. If a slight gap is formed between the pair of fastening flanges 1 in this fastening state, the inner surface of the plate 2 of the cylindrical heat sink 5 and the heating element 6
The outer surface is in close contact and the heat conductivity is good. In this example, since the bolt hole 8 is located outside in the width direction of the corrugated fin 3, it is easy to insert the bolt into the bolt hole 8, and a screwdriver or a spanner that rotates the bolt (screw). Is easy to mount.

FIG. 4 shows a flat heat sink 4 according to another embodiment of the present invention, and FIG. 5 shows the cylindrical heat sink 5. This example is different from the examples shown in FIGS. 1 and 3 in that an intermediate plate 9 is placed on the plate 2 and the corrugated fins 3 are placed on the intermediate plate 9 so that both plates, and the corrugated fins, Are fixed by brazing between the contact portions. The intermediate plate 9 has projections formed at regular intervals, and the corrugated fins 3 are arranged between adjacent projections.

FIGS. 6 and 7 show another embodiment. FIG. 6 shows that the corrugated fins 3 are arranged on the surface of the plate 2 opposite to the rising surface of the fastening flange 1 with respect to the plane of the plate 2. It is an example. Further, in this example, a pair of mounting portions 10 are formed on the side of the plate 2 by bending. Then, the flat heat sink 4 shown in FIG. 6 is completed, and then the corrugated fin side is brought into contact with the outer periphery of the heating element 6 as shown in FIG. That is, the top of each wave of the corrugated fin 3 is arranged so as to be in contact with the heating element 6, and the pair of fastening flanges 1 is fastened and fixed by the fastener 7 via the bolt holes 8. In this example, cooling air is supplied between the plate 2 and the heating element 6 via a duct (not shown). The mounting portion 10 is for mounting the tubular heat sink 5 to the duct or the casing.

[0013]

According to the heat sink of the present invention, the corrugated fins 3 are arranged on the surface of the flat plate 2 and the contact portions thereof are fixed by brazing to form the flat heat sink 4. Then, the flat heat sink 4 is wound around the outer periphery of a cylindrical body or a cylindrical body to form a cylindrical heat sink 5, and a heating element 6 to be cooled is arranged in the cylindrical heat sink 5, and a pair of fastening members is provided. Since the flanges 1 are configured to be fastened and fixed by the fasteners 7, it is easy to manufacture, and the cylindrical heat sink 5 can be in close contact with the outer periphery of the heating element 6, so that a heat sink having good heat dissipation can be provided.

Next, in the heat sink according to the second aspect, the flat heat sink 4 is directly wound around the outer periphery of the heating element 6 and the fastening flanges 1 are fastened and fixed between the fastening flanges 1. And the heating element 6 can be brought into close contact. According to the third aspect of the present invention, the fastening flange 1 is provided with bolt holes 8 which are aligned with each other, and the tubular heat sink 5 can be attached to the heating element 6 via bolts. According to the fourth aspect of the present invention, since the both sides in the width direction of the fastening flange 1 are arranged outside the both sides of the corrugated fin 3 in the width direction, and the bolt holes 8 are provided in the portions, the bolt holes are provided. The screw inserted into the bolt 8 can be easily screwed, and the heat sink can be easily handled.

According to a fifth aspect of the present invention, there is provided a step of manufacturing a flat heat sink in which the corrugated fins 3 are positioned on the surface of the flat plate 2 and brazed and fixed therebetween, and the flat heat sink is connected to the heating element 6. This is a method of using a heat sink having a process of winding around the outer circumference and fastening and fixing the fastening flange 1 between the fastening flanges 1 with a fastener 7. The method is easy to manufacture and attach, and the heat sink 6 is securely brought into close contact with the heat sink surface. The heat radiation of the heating element 6 can be improved. According to a sixth aspect of the present invention, there is provided a step of manufacturing a flat heat sink, and manufacturing the flat heat sink by winding the flat heat sink 4 around the outer periphery of a cylindrical or cylindrical plastic deformation member to be plastically deformed into a cylindrical shape. And a heat sink that is easy to manufacture and that can reliably perform brazing of the plate 2 and the corrugated fin 3.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first manufacturing process of a heat sink according to the present invention.

FIG. 2 is a front view of a main part of FIG. 1;

FIG. 3 is a perspective view showing a second manufacturing process of the heat sink of the present invention.

FIG. 4 is a perspective view showing an embodiment of another flat heat sink 4 of the present invention.

FIG. 5 is a perspective view showing an embodiment of the cylindrical heat sink 5 of the present invention.

FIG. 6 is a perspective view showing another embodiment of the flat heat sink 4 of the present invention.

FIG. 7 is a perspective view showing an embodiment of the cylindrical heat sink 5 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fastening flange 2 Plate 3 Corrugated fin 4 Flat heat sink 5 Cylindrical heat sink 6 Heating element 7 Fastener 8 Bolt hole 9 Intermediate plate 10 Mounting part

Claims (6)

[Claims] 1. A flat plate 2 having a pair of fastening flanges 1 aligned at both ends thereof rising, and a wave traveling direction is arranged in a direction in which the pair of fastening flanges 1 are separated from each other. A flat heat sink 4 is formed by the corrugated fins 3 whose respective tops or valleys come into contact with the surface of the plate-shaped plate 2 and whose contact portions are brazed and fixed. The corrugated fin 3
Is wound around the outer periphery of a cylindrical body or a cylindrical body to form a cylindrical heat sink 5, and a circular cooling target having a circular cross-sectional outer periphery is formed in the cylindrical heat sink 5. A heat sink in which a heating element 6 is arranged and a pair of the fastening flanges 1 is fastened and fixed by fasteners 7. 2. The heat sink according to claim 1, wherein the cylindrical body or the cylindrical body is the heating element 6 itself. 3. The heat sink according to claim 1, wherein the pair of fastening flanges 1 are provided with bolt holes 8 that are aligned with each other. 4. The fastening flange 1 according to claim 3, wherein both sides in the width direction of the fastening flange 1 are arranged outside the both sides of the corrugated fin 3 in the width direction, and bolt holes 8 are provided on both sides of each fastening flange 1. Heat sink. 5. A flat plate 2 having a pair of fastening flanges 1 aligned at both ends thereof,
Step of manufacturing a flat heat sink 4 in which the traveling direction of the wave is arranged in the direction in which the pair of fastening flanges 1 are separated from each other, the top surfaces or the valley outer surfaces of the corrugated fins 3 are brought into contact, and the contact portions are brazed and fixed. The flat heat sink 4 is wound around the outer periphery of a cylindrical or columnar heating element 6 to be cooled, with the wave traveling direction of the corrugated fin 3 positioned in the circumferential direction, and a pair of the fastening flanges is provided. And a step of fastening and fixing the space between the two with a fastener 7. 6. A flat plate 2 on which a pair of fastening flanges 1 aligned at both ends are raised,
Step of manufacturing a flat heat sink 4 in which the traveling direction of the wave is arranged in the direction in which the pair of fastening flanges 1 are separated from each other, the top surfaces or the valley outer surfaces of the corrugated fins 3 are brought into contact, and the contact portions are brazed and fixed. A tubular heat sink 5 which is positioned in the circumferential direction with the traveling direction of the wave of the corrugated fins 3, and the flat heat sink 4 is wound around the outer periphery of a cylindrical or cylindrical plastic deformation member to be plastically deformed into a cylindrical shape. A method for manufacturing a heat sink, comprising: