JPS5932852Y2 - heat dissipation device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a heat dissipation device using a heat pipe, in which a heat pipe is almost completely buried in the center of a heat radiator having a plurality of heat dissipation plates on the outer periphery, and a heat generating component is embedded in the heat dissipation plate. The heat dissipation effect is improved by attaching the

2. Description of the Related Art Heat dissipation devices have been known that utilize a device called a heat pipe to efficiently dissipate heat from a power transistor.

FIG. 1a shows such a conventional heat dissipation device, in which 1 is a heat pipe, 2 is a support attached to one end corresponding to the heating part of the heat pipe 1, and 3 is attached to the support 2. 4 is a heat-radiating fin attached to the other end of the heat pipe 1 corresponding to the heat-radiating part.

Figure 1 shows the structure of a heat pipe 1. A porous material 6 with capillary action is provided on the inner wall of a sealed tube 5, and the inside of this sealed tube 5 is depressurized and an appropriate amount of working liquid is poured into it. 7 is enclosed.

In general, focusing on thermal changes, one end 1a is a heating section,
The other end 1b is called a heat dissipation section, and focusing on changes in the working fluid 7, the end 1C corresponding to the heating section 1a is called an evaporation section, and a heat dissipation section 1b.
The end portion 1d corresponding to the end portion 1d is called a condensing portion, and the portion 1e therebetween is called a heat insulating portion.

In the above configuration, when the heat generating component 3 generates heat, the working fluid 7 is heated through the support 2 and the sealed tube 5, and this working fluid 7 absorbs heat from the tube wall and evaporates.

As a result, the vapor pressure in the evaporating section 1C increases, and the working fluid 7 moves through the heat insulating section 1e to the condensing section 1d where the pressure is low.

Here, the hot vapor releases heat to the tube wall and condenses back into liquid.

The condensed working fluid 7 returns to the evaporator 1C due to the capillary action of the porous material 6 and is heated again.

By repeating heating → evaporation → heat radiation → condensation of the working liquid 7 in this way, a heat radiation device with extremely low thermal resistance is realized.

However, in the heat dissipation device shown in FIG. 1a, the heat generating component 3 and the fins 4 are simply thermally coupled via the heat pipe 1, so heat cannot be directly transferred from the heat generating component 3 to the fins 4. Moreover, since the heat dissipation fins 4 are only attached to the condensing part 1d of the heat pipe 1, the fins 4 themselves become small and there is a problem that sufficient heat dissipation effect cannot be expected.

The present invention provides a heat dissipation device that solves these conventional problems.

An embodiment of the present invention will be described below with reference to FIGS. 2a, b, and 3.

In the figure, 8 is a heat sink, 9 is a heat pipe, and 10 is a heat generating component such as a power transistor.

The heat radiator 8 has a hollow portion 8a in the center, and a heat radiation plate 8b and heat radiation fins 8C radially formed on the outer periphery, and these are integrally formed by extrusion molding aluminum.

As shown in FIG. 2, the plate 8b is provided over the entire length in the axial direction, and a heat generating component 10
is attached as close to the tube wall of the hollow portion 8a as possible.

Moreover, as shown in FIG. 2, the fin 8C is the heat generating component 1.
The minimum amount necessary to allow the installation of 0 is removed from the bottom edge.

As shown in FIG. 3, a heat pipe 9 is inserted tightly into the hollow portion 8a and fixed thereto by adhesive or other means.

Further, as is clear from the drawing, the hollow portion 8 of the heat sink 8
a and play) 8b in the axial direction is the heat pump 9
It is configured to be substantially equal to the total length of.

With this configuration, the heat from the heat-generating component 10 heats the working fluid 11 through the radiator 8, and the vaporized high-temperature working fluid 11 moves upward as the pressure rises at the bottom, where it connects the plate 8b and the fins. It transfers heat to 8C, condenses and liquefies, and descends again due to gravity.

Through this operation, heat radiation is performed based on the original function of the heat pipe, but at this time, since the length of both the plate 8b and the fin 8C is approximately equal to the total length of the heat pipe 9, the conventional heat radiation shown in FIG. The heat dissipation effect can be made more excellent than that of other devices.

Furthermore, since the heat generating component 3 is attached to the plate 8b of the heat radiator 8, the heat from the heat generating component 3 is transmitted not only to the heat pipe 9 but also directly to the heat pipe 8b and the fins 8C.

Therefore, heat radiation by the heat pipe 9 and direct plate 8b
Further superior heat dissipation effects can be expected due to the heat dissipation transmitted to the fins 8C.

Furthermore, since the radiator 8 is formed into a cylindrical shape as a whole, and the heat pipe 9 is inserted into the center of the radial plates 8b and fins 8C, the heat generation source is substantially concentrated on the axis of the radiator 8. Since heat is dissipated radially from this point, the heat dissipation effect can be enhanced in this respect as well.

FIGS. 4a and 4l) show another embodiment of the present invention, in which the space occupied by the radiator 8 is made square so that the space can be used effectively.

5a and l), in order to attach the heat generating part 10 closer to the pipe wall of the hollow part 8a, a part of the pipe wall is used as a plate 8b, and the heat generating part 10 is mounted there. By considering the arrangement of the fins 8C for attaching the heat generating part 10, the heat resistance is low and the number of processing steps is reduced, so that the structure can be made at low cost.

In Fig. 6 a, l), a wind tunnel 12 is provided inscribed in the plate 8b and the fin 8C, and the outside air is forced to pass through the fin 13 from the end opposite to the side where the heat generating component 10 is attached, thereby dissipating heat. This is designed to increase the effect.

In addition, in FIGS. 4 to 6, parts having the same reference numerals as in FIGS. 2 and 3 have the same functions.

Further, in each embodiment, the heat radiator 8 and the heat pipe 9 are made to have substantially the same length, but it is clear that the radiator 8 may be longer.

Further, as long as the heat pipe 9 is arranged in the vertical direction, there is no need to provide a porous material inside as in the conventional case.

As described above, in the present invention, the length of the hollow part of the radiator and the plate are substantially equal to or longer than the total length of the heat pipe, and the heat pipe is inserted closely into the hollow part. Therefore, heat dissipation using a heat pipe can be carried out efficiently by using a sufficiently large plate.

Moreover, since the heat generating components are attached to the plate, the heat from the heat generating components is not only transmitted to the heat dissipation plate via the heat pipe, but also directly to the heat dissipation plate, and this function also promotes heat dissipation. Ru.

Further, the heat radiator itself is formed in a columnar shape such as a cylinder or a square column, and the heat source is concentrated at the axis of the heat radiator, and the heat is uniformly radiated around the entire circumference via the plurality of plates.

Therefore, by integrating all of these heat dissipation functions, the heat dissipation effect as a whole can be significantly improved.

Furthermore, since the heat-generating component is attached at one end of the plate at the position closest to the heat pipe, the distance between the heat pipe and the heat-generating component can be shortened, and heat dissipation efficiency can be increased accordingly.

[Brief Description of the Drawings] Figures 1a and 1b are perspective views and sectional views showing a conventional heat dissipation device and a heat pipe used therein, and Figures 2a and 1) are top views and sectional views showing an embodiment of the present invention. Side view, Figure 3 is a sectional view, Figure 4 a, l), Figure 5 a, l), Figure 6 a,
l) is the second aspect of the present invention. Third. It is a figure showing the 40th example. 8...Radiator, 8a...Hollow part, 8
b... Heat dissipation play 1~. 8C... Heat dissipation fin, 9... Heat pipe, 10...
...Heat-generating parts.

Claims (1)

[Scope of utility model registration request] comprising a heat pipe with a working fluid sealed inside, and a heat radiator integrally formed with a plurality of plates having a hollow part in the center and having a length approximately equal to the hollow part in the axial direction of the outer periphery, The length of the hollow part and the plate in the axial direction is substantially equal to or slightly longer than the total length of the heat pipe, and the heat pipe is inserted closely into the hollow part, and the A heat dissipation device consisting of a heat generating component attached to one end of a plate at a position closest to the heat pipe.