JPS6213598B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat pipe type heat sink, and particularly to a heat pipe type heat sink for heat radiation of transistors and ICs used in audio equipment, computers, and the like.

Conventionally, a loop-shaped heat pipe with a condensing section in the upper part and an evaporating part in the lower part has been proposed (Japanese Unexamined Patent Publication No. 82445/1983). In this proposed loop-shaped heat pipe, the condensing section is formed by a horizontal straight pipe section, and the evaporating section is formed by a horizontal meandering pipe section. are connected by vertical straight pipes. If the straight pipe connecting the condensing part and the evaporating part is vertical in this way, the liquid working fluid flowing back from the condensing part to the evaporating part flows down the entire inner peripheral wall of the vertical straight pipe part in the form of a film. The contact area between the gaseous working fluid and the liquid working fluid rising from the evaporating section to the condensing section increases. As a result, both the reflux rate of the liquid working fluid and the rising rate of the gaseous working fluid become slow, and the number of cycles of evaporation and condensation per unit time decreases, so that the heat transport capacity decreases accordingly. Heat dissipation of the gaseous working fluid already begins at the upper part of the vertical straight pipe, but as mentioned above, the liquid working fluid flows down the entire inner circumferential wall of the vertical straight pipe in the form of a film. Heat is dissipated through the liquid film, resulting in poor heat dissipation efficiency.

SUMMARY OF THE INVENTION An object of the present invention is to provide a heat pipe type heat radiator which solves the above-mentioned problems, is compact as a whole, has good heat radiation efficiency, and is easy to attach the fins and the heat transfer member for connecting the heat source.

This invention will be explained below with reference to the drawings.

The heat pipe type radiator according to the present invention has a first
As shown in the figure and FIG. 2, a pair of parallel straight pipe parts 1a and 1b and a bent pipe part 1c connecting the left ends and right ends of both the straight pipe parts 1a and 1b, respectively. The inside of the loop-shaped tube is made into a vacuum state, and a working fluid forming a gas-liquid two-phase flow is sealed inside, and one straight tube section 1a
is located above the other straight pipe part 1b, and the side bent pipe part 1c is inclined when viewed from the side, the upper straight pipe part 1a is a condensing part, and the lower straight pipe part 1b is an evaporating part. 1, a heat transfer member 6 for connecting a heat source attached to a lower straight pipe portion 1b, and a heat radiation fin 4 fixed to the heat pipe 1.

The loop-shaped tube is formed into a horizontally long dowel shape as a whole by butt-welding the hairpin tube 2 and the U-shaped tube 3. The working fluid W is injected through a small hole 5 made in one end of the loop tube.
The small hole 5 is closed after the working fluid W is injected. A large number of rectangular heat dissipating fins 4 are fixed to the loop-shaped tube astride both straight tube sections 1a and 1b. Heat transfer member 6
has a block shape with a rectangular cross section and has a fitting hole with a hole diameter matching the outer diameter of the straight pipe portion 1b, and has a horizontal protrusion 6a on one side of the lower end, into which a heat source such as a transistor is attached. Ready to be installed. The heat transfer member 6 is located in the middle of the length of the lower straight pipe portion 1b, and the lower half of the fin 4 where the heat transfer member 6 is present is removed.

Note that the heat pipe type radiator according to the present invention, as shown in FIGS. 4 and 5,
It is also possible to use the pair of straight pipe portions 1a and 1b in an inclined manner when viewed from the front. FIG. 4 shows a wick type pipe, in which a wick 7 is installed only in the lower straight pipe portion 1b. The upper straight pipe portion 1a functions as a gravity type with low thermal resistance.
FIG. 5 shows a completely gravity type heat radiator, and this heat pipe type radiator is filled with a slightly larger amount of working fluid W than the Wick type heat radiator shown in FIG.
If this is not the case, the heat transfer member 6 is moved to a position in the lower straight pipe portion 1b where the working fluid W is present.

The heat pipe type radiator according to the present invention has a heat pipe 1 which is the main body of the heat pipe 1, which connects a pair of parallel straight pipe parts 1a and 1b, and the left ends of both straight pipe parts 1a and 1b, and the right ends of the straight pipe parts 1a and 1b. The inside of the loop-shaped tube consisting of the bent tube portion 1c is made into a vacuum state, and a working fluid forming a gas-liquid two-phase flow is sealed inside the loop-shaped tube, and one straight tube portion 1a is lower than the other straight tube portion 1b. The bent side pipe part 1c is positioned upward and is inclined when viewed from the side, the upper straight pipe part 1a is a condensing part, the lower straight pipe part 1b is an evaporation part, and the lower straight pipe part 1b is a heat source. Since the connecting heat transfer member 6 is attached and the heat radiation fin 4 is fixed to the heat pipe, the working fluid W is heated by the heat absorbed from the heat transfer member 6.
The operation of evaporating in the lower straight pipe section 1b, radiating heat from the heat radiation fins 4 in the upper straight pipe section 1a, condensing it, and refluxing is repeated. When the liquid working fluid W flows back, since the side bent pipe portion 1c of the loop-shaped pipe is inclined when viewed from the side, the liquid working fluid W flows down only along the inner wall on the lower side of the pipe cross section, not the entire inner wall of the pipe. .
Therefore, compared to when the side bent pipe section is vertical when viewed from the side, the contact area between the countercurrent liquid working fluid and the gaseous working fluid becomes smaller, and as the heat transport capacity increases, the heat dissipation efficiency decreases. get better. Furthermore, since the loop-shaped tube has a pair of parallel straight pipe parts 1a and 1b, and the left ends and right ends of both straight pipe parts 1a and 1b are respectively connected by a bent pipe part 1c, a pair of parallel straight pipe parts 1a and 1b are connected. It is easy to fix the radiation fin 4 using the pipe parts 1a and 1b, and it is also easy to attach the heat transfer member 6 for connecting the heat source to one of the straight pipe parts 1b. This has the advantage that the heat sink can be made more compact.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view of a radiator according to the invention, and FIG.
Figure 3 is a vertical cross-sectional view of the radiator when the straight pipe section is horizontal when viewed from the front.
Figure 4A is a vertical cross-sectional view of a radiator with a straight pipe section tilted when viewed from the front, and Figure 4B is a side view.
FIG. 5A is a vertical cross-sectional view of a gravity-type radiator with inclined straight pipe portions, and FIG. 5B is a side view, and the fins are omitted from FIGS. DESCRIPTION OF SYMBOLS 1...Loop-shaped pipe, 1a...Upper straight pipe part, 1b...Lower straight pipe part, 1c...Side bent pipe part, 4...Radiation fin, 6...Heat transfer member.

Claims (1)

[Claims] 1 The inside of a loop-shaped tube consisting of a pair of parallel straight tube sections 1a and 1b and a bent tube section 1c connecting the left ends and right ends of both straight tube sections 1a and 1b, respectively, is made into a vacuum state. At the same time, a working fluid forming a gas-liquid two-phase flow is sealed inside the pipe, one straight pipe part 1a is positioned above the other straight pipe part 1b, and the side bent pipe part 1c is inclined when viewed from the side. , a heat pipe 1 in which the upper straight pipe part 1a is a condensing part and the lower straight pipe part 1b is an evaporating part, a heat transfer member 6 for connecting a heat source attached to the lower straight pipe part 1b, and A heat pipe type radiator equipped with radiating fins 4.