JP3040058U - heatsink - Google Patents

Abstract

(57) [PROBLEMS] To provide a heat sink that is easy to manufacture and has excellent fin heat dissipation. SOLUTION: A large number of fins 2 made of a press-molded body of a thin metal plate are spaced apart from each other and fixed to the surface of a base 1 by implantation. The fin 2 has a rectangular wave-shaped plane with a large amplitude, with a connecting portion 2a left at one end.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a heat sink for cooling a heat generating element such as a power thyristor.

[0002]

[Prior art]

 The conventional type of heat sink is mainly one in which a base portion that constitutes an element mounting surface and a fin portion that increases a heat radiation area are integrally formed. FIG. 7 shows an example thereof, which was formed by cold forging. There has also been a proposal to separate the base member and the fin member and join a corrugated fin member to the base member.

[0003]

[Problems to be solved by the device]

 The integrally-formed heat sink by cold forging has a limitation in fin thickness, fin pitch, overall size, and the like due to manufacturing restrictions, and has a drawback that it is difficult to quickly respond to various heat capacities. In addition, a heat sink consisting of a corrugated fin and a base joined together can increase the heat radiation area and easily manufacture heat sinks of various capacities, but it is difficult to distribute airflow to all parts of the inner and outer surfaces of the corrugated fin. At the same time, the natural convection type heat sink has a drawback that heat is easily accumulated. Then, this invention makes it a subject to solve these problems.

[0004]

[Means for Solving the Problems]

 The heat sink of the present invention comprises a base 1 made of a flat metal plate to which an exothermic element is bonded on one surface, and a press-formed body of a metal plate thinner than the thickness of the base 1, with a connecting portion at one end. 2a is left, and a large number of fins 2 whose planes are cut out in a rectangular wave shape with a large amplitude are provided, and the connection portions 2a of the respective fins 2 are separated from each other on the other surface of the base 1. It was then heat-transferred and fixed. Further, in a preferred embodiment of the present invention, a large number of fin-fitting slits 1a are formed in parallel on the base 1, and the connecting portions 2a of the fins 2 are fitted and fixed to the respective slits 1a. It is a thing. Further, each of the fins 2 is bent and formed in a groove shape as a whole, the connecting portion 2a is formed in the groove bottom portion thereof, and the rectangular wave is formed in the side wall portion thereof, and the groove bottom portion thereof is formed as described above. It is joined to the surface of the base 1. Further, the wave width W of the rectangular wave of the fin 2 and the cutout width V are formed to be equal. Furthermore, in the above configuration, the wave phases of the adjacent fins 2 are displaced by a half pitch position and fixed by implantation.

[0005]

[Embodiment of the invention]

 Next, an embodiment of the present invention will be described with reference to the drawings. 1 and 2 are explanatory views showing a first example of the present invention, FIG. 1 is an exploded perspective view of a main part thereof, and FIG. 2 is an explanatory view showing a molding state of fins 2 used in the heat sink. . This heat sink has a base 1 and fins 2 each made of an aluminum material, and the base 1 has a relatively thick plate and has a large number of slits 1a formed on its surface. This slit 1a can be easily formed by extrusion molding or cutting. The fin 2 is an aluminum plate whose surface is clad with a brazing material, and is cut by press molding as shown in FIG. 2 as an example. The fin 2 has a rectangular wave-shaped plane with a large amplitude, with a connecting portion 2a left at one end. Then, as shown in FIG. 1, the connecting portions 2a of the fins 2 are attached to the slits 1a of the base 1, respectively. Preferably, the adjacent fins 2 are displaced by a half pitch in wave pitch. Then, the assembly is inserted into a high-temperature furnace, the filter material (not shown) on the surface of the fin 2 is melted, and then it is solidified, so that the base 1 and the fin 2 are integrally brazed. It is something that is fixed.

Next, FIGS. 3 and 4 show a second example of the present invention. In this example, the connecting portion 2a of the fin 2 is placed on one surface of the base 1, and the placing portion is integrated. The brazing is fixed. The fin 2 is formed by bending a plate material into a groove shape, a connecting portion 2a is formed at the groove bottom portion thereof, a rectangular wave is formed at the side wall portion thereof, and an outer surface of the groove bottom portion is joined to the surface of the base 1. It is a thing. Also in this example, the phases of adjacent waves are shifted by a half pitch in the traveling direction. FIG. 5 shows another example of the present invention, and the wave phases may be the same as in this example. Further, FIG. 6 is an explanatory view showing another example of the fin 2, and the fin 2 of this example has a wave shape formed on both side edges of a rectangular wave. The corrugations may be three-dimensionally formed on the rectangular wave plane. 1, 4, and 5, the heat sink of the present invention thus constructed has a heat-generating element for electric power such as a thyristor and the like, which is heat-conductively bonded to the lower surface side thereof by means of bonding or the like. . Cooling air is generally blown to the heat sink by a fan.

[0007]

[Functions and effects of the invention]

 The heat sink of the present invention has a large number of fins 2 made of a press-molded body of a thin metal plate and fixed to the surface of a thick base 1. The fin 2 is formed by cutting a flat surface in a rectangular wave shape having a large amplitude, leaving the connecting portion 2a, and fixing the connecting portion 2a on the surface of the base 1 so as to be spaced apart from each other. Therefore, the fins 2 are opened at their respective tip ends, and the heat dissipation can be improved, and the uncut notch connecting portion 2a is joined to the base 1, so that the fins of the base 1 and the fins 2 are joined together. It is possible to provide a heat sink with a high mass productivity that ensures sufficient heat conductivity and is easy to manufacture with high density. Since each fin 2 is made of a press-molded product, its heat dissipation area can be freely formed according to various heat capacities. Further, in the case where a large number of slits 1a to be fitted are arranged in parallel to the base 1 and the connecting portions 2a of the fins 2 are fitted and fixed to the respective slits 1a, the heat transfer between the base 1 and the fins 2 is further improved. You can

Next, the fin 2 is formed in a groove shape as a whole, the connection portion 2 a is formed in the groove bottom portion, and a rectangular wave is formed in the side wall portion, and the groove bottom portion is formed on the surface of the base 1. In the case where they are joined together, the joint area between the base 1 and the fins 2 becomes wider, and the heat transfer between them can be improved. Further, in the heat sink in which the wave width W of the rectangular wave of the fin 2 and the cutout width V are formed to be equal to each other, when the fin 2 is press-molded, wasteful material does not come out and the planing is efficiently performed. You can In a heat sink in which the wave phases of the adjacent fins 2 are displaced by a half pitch position and fixed in place, the distance between adjacent heat dissipation surfaces is widened to prevent thermal interference with each other and to dissipate heat in a small space. It can be a highly effective heat sink.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of essential parts of a heat sink of the present invention.

FIG. 2 is an explanatory view showing a manufacturing process of fins 2 used for the heat sink.

FIG. 3 is an explanatory view showing a manufacturing process of another heat sink fin 2 of the present invention.

FIG. 4 is a perspective view of a main part of the other heat sink.

FIG. 5 is a perspective view showing another example of a heat sink.

FIG. 6 is an explanatory view showing a manufacturing process of the fin 2 of still another heat sink.

FIG. 7 is a perspective view of a main part showing an example of a conventional heat sink.

[Explanation of symbols]

 1 Base 1a Slit 2 Fin 2a Connection part

Claims (5)

[Utility model registration claims] 1. A base 1 made of a flat metal plate having an exothermic element heat-conductively bonded to one surface, and a press-formed body of a metal plate thinner than the thickness of the base 1, one end of which is formed. And a large number of fins 2 whose planes are cut out in a rectangular wave shape with a large amplitude, leaving the connecting portion 2a, and the connecting portion 2a of each fin 2 is formed on the other surface of the base 1 with respect to each other. A heat sink that is separated and heat-transferred and fixed. 2. The heat sink according to claim 1, wherein a large number of fin-fitting slits 1a are formed in parallel on the base 1, and the connecting portions 2a of the fins 2 are fitted and fixed to the respective slits 1a. 3. The fins 2 according to claim 1,
Is bent in a groove shape as a whole, the connection portion 2a is formed in the groove bottom portion thereof, the rectangular wave is formed in the side wall portion thereof, and the groove bottom portion is joined to the surface of the base 1. . 4. The heat sink according to claim 1, wherein the wave width W of the rectangular wave of the fin 2 and the cutout width V are formed to be equal to each other. 5. The fins 2 adjacent to each other according to claim 4,
A heat sink in which the wave phase of is shifted by half a pitch and fixed by implantation.