JPS6244542Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a heatsink, and more specifically, to a heat sink to which a heating element such as a semiconductor element such as a transistor or a thyrist, or an electric component such as an integrated circuit is attached. The present invention relates to a heat radiator used to radiate heat from a heated heating element.

Prior Art and Its Problems This type of radiator is generally made of an extruded material in which a heating element mounting portion and a radiating fin are integrally formed. In this radiator, a hollow part is provided in the heating element mounting part that penetrates in a direction parallel to the extrusion direction, and this hollow part is turned into a heat pipe by filling the working fluid for the heat pipe and closing both ends. Heat is dissipated through the action of the pipes. However, even in this heat radiator, the heat radiation efficiency is becoming insufficient.

This invention was made in view of the above-mentioned circumstances, and the purpose is to provide a heat radiator with better heat radiation efficiency than conventional ones.

Means for Solving the Problems The heat sink according to this invention is made of an extruded material in which the heating element mounting part and the heat radiation fins are integrally molded, and these are extruded into the heat generating element mounting part and the heat radiation fins, respectively. Hollow portions are provided that penetrate in a direction parallel to the direction and communicate with each other, and both hollow portions are made into heat pipes by sealing a heat pipe working fluid and closing both ends.

This heat sink is made of a metal with good thermal conductivity, such as aluminum (including aluminum alloy). The hollow part is formed during extrusion molding of this radiator.
formed at the same time. As the working fluid for the heat pipe, for example, water, freon, etc. are used.

Embodiments This invention will be explained below with reference to the drawings. In the following description, front and rear refer to FIG. 2, and the front refers to the left side of the figure, and the rear refers to the right side of the figure. In addition, left and right refer to the direction toward the rear.

In the drawing, the heat sink 1 according to this invention is made of extruded aluminum, and includes a horizontally rectangular vertical plate-shaped heating element mounting part 2, and a front side of the heating element mounting part 2 at predetermined intervals in the left and right direction. It consists of a plurality of heat dissipation fins 3 that are integrally formed in a projecting shape and extend in the vertical direction. Hollow portions 4 and 14 are formed in the heating element mounting portion 2 and the heat radiation fin 3, respectively, passing through them in the vertical direction and communicating with each other. These hollow parts 4 and 14 are formed at the same time when the radiator 1 is extruded. And both hollow parts 4,
The heat pipe working fluid 5 is sealed in the hollow parts 4 and 14, and both upper and lower ends are closed.
4 is a heat pipe. Hollow part 4,1
The lower end of 4 is made of aluminum (made of aluminum alloy) and includes a rectangular part and a plurality of forward protrusions having a shape corresponding to the cross-sectional shape of fins 3 which are connected to the front edge of the rectangular part and are provided in a comb-tooth shape. ) Lid 6
is blocked by. The upper ends of the hollow parts 4 and 14 are closed with a lid 8 made of aluminum (including aluminum alloy) having the same shape as the lid 6 and having an injection port 7. Both lids 6 and 8 are welded to the heating element mounting portion 2 and the fins 3. And injection port 7
Working fluid 5 is flowed into the hollow parts 4 and 14 from
This injection port 7 is then caulked and sealed.

In this radiator 1, the heating element 9 is attached by screws or the like to the lower part of the rear surface of the heating element mounting portion 2, which is the surface opposite to the surface on which the fins 3 are provided. The thickness of the rear side wall of the heat generating element attachment part 2 to which the heat generating element 9 is attached is made thicker than the length of the above-mentioned screws, so that the screws penetrate the above-mentioned wall and release the heat pipe working fluid 5 in the hollow parts 4 and 14. Make sure that it does not leak. The working fluid 5 staying in the lower part of the hollow parts 4 and 14 is heated and vaporized by the heat transmitted from the heating element 9 through the lower part of the rear side wall of the heating element mounting part 2, and the working fluid 5 stays in the lower part of the hollow parts 4 and 14. The gaseous working fluid liquefies heat and then liquefies.
It circulates to the bottom. The heat released when the gaseous working fluid is liquefied is transmitted to the fins 3 and is radiated therefrom.

In the above embodiment, the hollow part may be designed with partition walls orthogonal to the front and rear walls of the heat generating element attachment part at a predetermined interval in the left-right direction, and the hollow part may be divided into a plurality of partitions. Then, the heating element can be screwed to the portion corresponding to the partition wall, and there is no need to make the rear wall thick. In this case, it is preferable to cut out both the upper and lower ends of the partition wall to allow the respective sections to communicate with each other.

Effects of the invention Since the radiator according to this invention is configured as described above, the heat radiation efficiency is higher than that of conventional radiators due to the action of the heat pipe formed across the heating element mounting part and the radiating fin. Significantly improved.
Therefore, the heat sink can be made smaller and lighter. That is, not only the heating element mounting part but also the heat dissipation fin is provided with a hollow part that communicates with the hollow part provided in the heating element mounting part, and both hollow parts are
Since the heat pipe is formed by enclosing the working fluid for the heat pipe and closing both ends, the cross section of the heat pipe becomes larger and the amount of working fluid increases, so that the heat pipe is formed only at the heating element attachment part. The heat dissipation efficiency is improved compared to the conventional one.

[Brief explanation of the drawing]

The drawings show an embodiment of the invention, with FIG. 1 being an exploded perspective view and FIG. 2 being a vertical cross-sectional view. DESCRIPTION OF SYMBOLS 1... Heat radiator, 2... Heat generating element attachment part, 3... Heat radiation fin, 4, 14... Hollow part, 5... Working fluid.

Claims (1)

[Scope of utility model registration request] The heat generating element attachment part 2 and the heat dissipation fin 3 are made of an integrally molded extruded material, and the heat generating element attachment part 2 and the heat dissipation fin 3 are each penetrated in a direction parallel to the extrusion direction and communicated with each other. hollow parts 4, 14 are provided, and both hollow parts 4, 14
However, this radiator is made into a heat pipe by enclosing a heat pipe working fluid 5 and closing both ends.