JPH04225791A - Heat pipe type radiator and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide high radiation performance by a method wherein the one surface forms a heat absorbing surface, the interior is protruded from the other surface of a hollow base part, a plurality of radiation parts communicating to the interior of the base part to form a heat pipe, and one or more fins for radiation are mounted to the radiation part. CONSTITUTION:A heat pipe 10 is roughly divided into a base part 11 and a radiation part 12. The base part 11 is formed in the shape of a box having parallel planes, and a heat generating element 90, e.g. a thyristor and a power transistor, is joined with a flat heat absorbing surface 11b being an outer surface on the other side. The radiation part 12 is formed in the shape of a cylinder with a bottom in a square in cross section. A number of the radiation parts are protruded from the other side of the base part 11, and a number of fins 14 are inserted in the radiation part 12. The base part 11 and the radiation parts 12 are molded in a shape that a metallic block formed of a thermal conductive material is extruded and the radiation parts 12 are arranged in a combform shape an upper base part 11A. An internal space formed such that a recessed part 11a is made to communicate with slits 12a is sealed with working liquid.

Description

[Detailed description of the invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pipe type heat radiator that diffuses heat generated by a semiconductor element, etc., and a method for manufacturing the same.

[Industrial application field]

0002

2. Description of the Related Art Semiconductor devices such as thyristors and power transistors that generate a medium amount of heat often use air-cooled heat sinks. FIG. 16 is a perspective view showing an example of a conventional heat radiator. The heat sink 80 is made of a thermally conductive material such as copper or aluminum by extrusion molding or casting.
It is manufactured in a shape having a base part 81 and a fin part 82. The heating element 90 was mounted in close contact with one plane of the base portion 81 of the heat radiator 80, and the heat was radiated by the fin portions 82.

0003

[Problems to be Solved by the Invention] However, in the conventional heat radiator described above, as the amount of heat radiated from the heating element increases,
There was a problem that the heat radiator 80 became heavier and larger in size. In addition, the fin portion 8 of the heat sink 80
If the pitch of 2 cannot be made narrower than a certain interval and the capacity is constant, there is a problem in that the heat dissipation area is limited and the cooling capacity is reduced.

On the other hand, in the case of electronic equipment, etc., which are placed together with other elements in a limited internal space, the basic shape of the heatsink is kept as is, and the cooling performance is improved while the occupied volume is reduced. It is necessary to realize reduction in weight and weight reduction.

[0005] An object of the present invention is to solve the above-mentioned problems and provide a heat pipe type heat radiator that improves heat radiation performance and is small and lightweight. Another object of the present invention is to provide a method for manufacturing a heat pipe type radiator that can easily manufacture such a heat pipe type radiator.

[0006]

[Means for Solving the Problems] A heat pipe type heat radiator according to the present invention includes a base portion having one surface as a heat absorbing surface and having a hollow interior, and a base portion protruding from the other surface of the base portion and having an interior portion as the base portion. The heat pipe is composed of a plurality of heat dissipating parts communicating with the inside of the heat pipe, and a working fluid is sealed inside the base part and the heat dissipating part, and one or more heat dissipating sheets attached to the heat dissipating part of the heat pipe. It consists of fins.

[0007] In this case, the heat dissipation section has a rectangular cross section,
The configuration may be circular or irregularly shaped. Further, the heat dissipation section may be provided at an angle to the base section or may be curved. Furthermore, a groove may be formed in the inner walls of the base part and the heat radiation part, or a mesh-like wick may be inserted therein. On the other hand, the groove may be a spiral groove.

On the other hand, in the method for manufacturing a heat pipe type radiator according to the present invention, in the method for manufacturing a heat pipe type radiator described above, the base portion of the heat pipe is replaced with a first base portion. and a second base part, and cutting the heat dissipation part and the first base part together,
manufactured by forging or extrusion or a combination thereof, the second base part is manufactured by cutting, forging or extrusion or a combination thereof, and the first and second base parts are joined by sawing or electron beam welding. It is configured to do so.

[0009] In this case, the heat dissipating portion of the heat pipe may have a structure in which a hole is bored inside the heat pipe and then a groove is formed using a drill. Method of manufacturing heating appliances. Further, a pipe is used as a heat dissipation part of the heat pipe,
It can be configured to be connected to an opening provided in the base portion by welding or the like.

0010

[Function] According to the present invention, a working fluid is sealed in the internal space of the base part and the heat radiating part, and the heat pipe is formed up to the tip of the heat radiating part, and the heat radiating part is provided with a large number of fins. Compared to conventional heat sinks that rely on solid conduction, heat radiation efficiency is dramatically increased.

[0011]

[Examples] Below, with reference to drawings, etc., examples will be explained.
The present invention will be explained in detail. 1 to 3 are views showing a first embodiment of a heat pipe type radiator according to the present invention, in which FIG. 1 is a perspective view, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. It is an exploded perspective view.

The heat sink of the first embodiment includes a heat pipe 1
0 and fins 14 for heat radiation. The heat pipe 10 is roughly divided into a base part 11 and a heat radiation part 12. The base portion 11 is a box-shaped portion having parallel planes, and a flat endothermic surface 11b is formed on the outer surface of one side. A heat generating element 90 such as a thyristor or a power transistor can be bonded to this heat absorbing surface 11b. The heat dissipation section 12 is a bottomed cylindrical section with a square cross section, and is provided in large numbers to protrude from the other side of the base section 11 . Further, the fins 14 are metal plates made of copper, aluminum, or the like, and a large number of fins are inserted into the heat dissipation section 12 at predetermined intervals.

The base portion 11 and the heat radiation portion 12 are integrally molded from a thermally conductive material such as copper or aluminum. As shown in FIG. 3, a metal block is extruded and formed into a shape in which the heat radiating parts 12 are arranged in a comb shape on the upper base part 11A, and the recesses 11 are formed in the upper base part 11A from the other side.
a1, and at the same time, a long and narrow hole 12a is made approximately at the center of each heat radiating portion 12 using a drill or the like. Then, a lower base portion 11B in which a recess 11a2 is formed is joined by brazing material 13 from below. Base part 11 and heat radiation part 12
That is, the recess 11a and the elongated hole 12a communicate with each other to form a hollow internal space, in which pure water or the like is sealed as a working fluid. A groove or the like may be formed in the inner wall of the recess 11a and the elongated hole 12a, or a mesh-like wick or the like may be inserted.

In the first embodiment, a large number of thin heat radiating parts 12 are provided, and the ends thereof are formed into heat pipes, and heat radiating fins 14 are provided, so that the heat radiating efficiency is extremely high.

4 to 15 are diagrams showing second to ninth embodiments of the heat pipe type radiator according to the present invention. In each of the embodiments described below, parts that perform the same functions as those in the first embodiment are given the same reference numerals at the end, and redundant explanations are omitted.

In the heat radiator of the second embodiment (FIGS. 4 and 5), the heat pipe 20 has a heat radiating portion 22 having a cylindrical shape with a bottom, and the heat radiating portion 22 is attached to the upper surface of the upper base portion 21A. It is integrally joined to the drilled attachment hole 21c by welding or the like. Further, a large number of heat radiating fins 24 are inserted into the heat radiating portion 22 . In the second embodiment, the heat dissipation section 22
It is possible to use a pipe that has already been manufactured as a pipe, and if necessary, it is possible to use a pipe whose inner surface is grooved, so that it can be suitably used when fine groove processing is required.

Heat sink of the third embodiment (Figs. 6, 7, 8)
), the heat pipe 30 has a heat radiating section 32 having a rectangular parallelepiped shape. In this embodiment, after forming a thin hole 32a inside the heat dissipation part 32, a spiral groove 32d is formed using a drill or the like to make the return of the working fluid efficient. Further, the heat dissipation section 32 includes a large number of heat dissipation fins 3.
4 has been inserted. In the third embodiment, the heat radiating section 32 has a rectangular cross section with one side of the thin heat radiating section 12 of the first embodiment as a short side, so that the number of processing steps can be reduced. Inside this heat dissipation part 32, there are elongated holes 3.
2a is processed so that it is evenly distributed in the longitudinal direction of the rectangular cross section, so the heat dissipation properties are also excellent.

In the heat radiator of the fourth embodiment (FIGS. 9 to 11), a heat pipe 40 has a base portion 41 and a large number of plate-shaped heat radiating portions 42 arranged therein. The inside of the heat dissipation section 42 is 1
It is hollow. On the other hand, in the heat sink of the fifth embodiment (FIGS. 12 and 13), the heat pipe 50 is
The external appearance is the same as the heat pipe 40, but a large number of elongated holes 52a are formed inside. Moreover, the heat radiation part 42,
A large number of heat radiation fins 44, 54 are inserted into the fin 52. In the fourth and fifth embodiments, the heat dissipating parts 42, 52 are made as long as possible relative to the dimensions of the base parts 41, 51 to further reduce the number of processing steps. At this time, the inside of the heat radiating section 42 has one cavity for each heat radiating section 42, but the inside of the heat radiating section 52 is the same as in the third embodiment, so that the heat dissipation characteristics are also excellent. There is.

In the heat sink of the sixth embodiment (FIG. 14), the heat pipe 60 has a heat dissipating section 62 with respect to the base section 61.
are provided at a predetermined angle. Furthermore, in the heat radiator of the seventh embodiment (FIG. 15), the heat pipe 70 has a heat radiating portion 72 that is curved. In this case as well, the heat dissipation parts 62, 7
A large number of heat dissipation fins 64, 74 are inserted into 2. In the sixth and seventh embodiments, the return of the working fluid from the evaporating section to the condensing section is good, and there is no need to provide a groove or the like inside. Note that the components other than the heat pipe 2 of the second embodiment can be manufactured by the same method as the first embodiment.

[0020]

As explained in detail above, according to the present invention, the base portion is provided with a large number of protruding heat radiating portions that are formed into heat pipes up to the tip, and the heat radiating portion is further provided with heat radiating fins. Since it has a larger capacity, it has a larger thermal cooling capacity, and with the same cooling capacity, both the occupied volume and weight can be significantly reduced. Therefore, even if the amount of heat generated by various elements increases, sufficient heat radiation can be achieved with the same or less than the conventional exclusive volume and weight, and there is no need to change the current positional relationship of the printed circuit board.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of a heat pipe type radiator according to the present invention.

FIG. 2 is a sectional view taken along line AA in FIG. 1;

FIG. 3 is an exploded perspective view showing a first embodiment of a heat pipe type radiator according to the present invention.

FIG. 4 is a perspective view showing a second embodiment of the heat pipe type radiator according to the present invention.

FIG. 5 is an exploded perspective view showing a second embodiment of the heat pipe type radiator according to the present invention.

FIG. 6 is a perspective view showing a third embodiment of the heat pipe type radiator according to the present invention.

FIG. 7 is a sectional view taken along line BB in FIG. 6;

FIG. 8 is a sectional view taken along line CC in FIG. 6;

FIG. 9 is a perspective view showing a fourth embodiment of a heat pipe type radiator according to the present invention.

FIG. 10 is a sectional view taken along line DD in FIG. 9;

FIG. 11 is a sectional view taken along line EE in FIG. 9;

FIG. 12 is a sectional view showing a fifth embodiment of the heat pipe type radiator according to the present invention.

FIG. 13 is a sectional view taken along line FF in FIG. 12;

FIG. 14 is a perspective view showing a sixth embodiment of the heat pipe type radiator according to the present invention.

FIG. 15 is a perspective view showing a seventh embodiment of a heat pipe type radiator according to the present invention.

FIG. 16 is a perspective view showing an example of a conventional heat radiator.

[Explanation of symbols]

10~70 Heat pipe 11-71 Base part 12-72 Heat dissipation part 14-74 Fin 90 Heating element

Claims (8)

[Claims] 1. A base part having a hollow interior and a heat absorbing surface on one side, and a plurality of heat radiating parts protruding from the other surface of the base part and communicating with the inside of the base part, A heat pipe type heat radiator comprising a base part, a heat pipe in which a working fluid is sealed inside the heat radiating part, and one or more heat radiating fins attached to the heat radiating part of the heat pipe. 2. The heat pipe type radiator according to claim 1, wherein the heat radiating section has a rectangular, circular, or irregular cross section. 3. The heat pipe type radiator according to claim 1, wherein the heat radiating part is provided on the base part at an angle or is curved. 4. The heat pipe type heat radiator according to claim 1, wherein a groove is formed or a mesh-like wick is inserted into the inner walls of the base part and the heat radiating part. 5. The heat pipe type radiator according to claim 4, wherein the groove is a spiral groove. 6. A method of manufacturing a heat pipe type radiator according to claim 1, wherein the base portion of the heat pipe is divided into a first base portion and a second base portion. , the heat dissipation part and the first base part are manufactured integrally by cutting, forging, or extrusion, or a combination thereof, and the second base part is manufactured by cutting, forging, extrusion, or a combination thereof,
A method of manufacturing a heat pipe type radiator, characterized in that the first and second base parts are joined by welding or electron beam welding. 7. The method of manufacturing a heat pipe type heat radiator according to claim 6, wherein the heat radiating portion of the heat pipe is formed into a groove by drilling after perforating the inside thereof. 8. A method of manufacturing a heat pipe radiator according to claim 1, wherein a pipe is used as the heat radiating portion of the heat pipe, and an opening provided in the base portion is provided with a pipe. A method for manufacturing a heat pipe type radiator, which is characterized by being connected by welding or the like.