JPS5921477B2 - heat pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat pipe, and particularly aims to improve the wick retainer thereof.

Heat pipes generally transport a large amount of heat at high speed, so
If the working fluid and pipe material are selected appropriately, it can be used in a wide range of temperatures, and by combining its size and shape, it can be used for cooling semiconductor devices, cooling motors, molds, solar energy collection systems, etc. It is about to be expanded to industrial furnaces, etc.

As shown in Figure 1, a typical heat pipe uses water, fluorocarbon, or alcohol as the working fluid, and the tube 1 that forms the heat pipe body is made of copper, copper alloy, aluminum, etc. A wick 2 is provided on the inner circumferential wall of this tube 1.
A fine wire mesh is tightly attached to the wick via the wick presser 2a.

In this case, an attempt is made to bring the wire mesh (wick) 2 into close contact with the inner circumferential wall of the tube 1, but this adhesion is poor, and air bubbles with low thermal conductivity are interposed in the gap, resulting in so-called paper lock, which significantly reduces heat transfer resistance. To increase.

In addition, there is a known device in which a coil spring 3 is interposed to press the inner surface of the wick 2 so that the wick 2 can be positively brought into close contact with the inner circumferential surface of the tube 1.

In this case, since the coil spring 3 is used as a wick holder for the wick 2, the degree of adhesion between the wick 2 and the inner surface of the tube 1 is improved to a certain degree, and the paper lock is alleviated to some extent. In the configuration, coil spring 3 is wick 2
The disadvantage is that the work of screwing into the inner circumferential surface of the screw is extremely troublesome.

The present invention eliminates the above-mentioned drawbacks, and one embodiment of the present invention will be described in detail below with reference to the drawings.

In FIGS. 3 to 6, 11 is a tube forming the main body of the heat pipe, and both end surfaces are closed by end plates 11a made of the same material.
A fine cylindrical wire mesh 12 serving as a wick is closely attached to the inner circumferential surface of the tube 1 in the longitudinal direction, and in the present invention, the inner surface of the wire mesh 12 forming the wick exhibits a corrugated cross section perpendicular to the axis. A corrugated member 13 is inserted as a wick retainer,
The axial protrusion 13a of the corrugated member 13 linearly supports the inner surface of the wick 12, ensuring that the wick 12 is in close contact with the inner circumferential wall of the tube 1, while the recess serves as a steam passage.

Further, this corrugated member 13 is made of a thin plate, and as shown in the developed view in FIG. 5, small holes 13b forming radial steam passages are also formed as appropriate.

In addition, in order to strengthen the pressing force of the corrugated member 13, a leaf spring material 14 is provided to press the inside.This leaf spring material 14 has a cylindrical shape, and as shown in FIG. A small hole 14a in the radial direction is also formed as appropriate.

When the amount of heat input to the heat pipe is small, the amount of steam movement is small, so the steam passage formed by the recess of the corrugated member 13 is sufficient, and the small holes 13b and 14a do not necessarily need to be formed.

Note that the end of the wick 12 that is in close contact with the tube 11 is cut off to reduce heat transfer resistance.

In the above configuration, since the wick is pressed by the linear protrusion in the axial direction so as to make it come into close contact with the inner circumferential surface of the tube that forms the heat pipe body, it is possible to cause poor heat transfer due to paper lock due to poor adhesion of the wick, as in the past. It is also easy to insert into the wick.

Further, a leaf spring material is provided inside the wick retainer, and the pressing force can be concentrated on the protruding portion of the corrugated member, so that the above-mentioned effect is further enhanced.

Furthermore, small radial holes are provided in both the corrugated member and the spring member to ensure the escape of steam, thereby providing a heat pipe with good heat pipe characteristics and easy manufacture.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an example of a conventional heat pipe, Fig. 2 is a sectional view of another conventional configuration, Fig. 3 is a longitudinal sectional view of a heat pipe according to the present invention, and Fig. 4 is a cross-sectional view perpendicular to its axis. FIG. 5 is a developed view of the corrugated member, and FIG. 6 is a developed view of the spring member. In the figure, 11 is a tube, 12 is a wick, 13 is a corrugated member, 13a is an axial linear protrusion, 13b is a hole, and 14
indicates a leaf spring material, and 14a indicates a hole.

Claims (1)

[Claims] 1. In order to bring the wick into close contact with the inner circumferential wall of the heat pipe body, a corrugated member whose cross section perpendicular to the tube axis is corrugated is provided inside the wick, and the axial straight protrusion of this corrugated member covers the inner surface of the wick. A heat pipe characterized in that a plate spring member is provided for pressing the corrugated member from inside to hold it down, and a hole forming a radial steam passage is formed in the corrugated member and the plate spring member.