JPS5917352B2 - Heat pipe arteri formation method - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for forming heat pipes.

In a heat pipe, as shown in FIGS. 1a and 1b, a wick 2, which is a porous material and exhibits a capillary phenomenon, is brought into close contact with the inner wall surface of a heat pipe container 1, for example, so that the working fluid flows from a condensing part 1a to an evaporating part. A reflux path of 1b is formed,
The reflux of the working fluid through the wick 2 is a seepage flow, so there is a large resistance, and if the heat and load are too high, there is a risk that the liquid near the evaporation section will completely evaporate. An arteries 3 as shown in FIG. 1C, which has the function of refluxing only the liquid, is provided between the sections to increase the reflux efficiency of the working fluid.

As this type of arteri, constructions as shown in FIGS. 2a, b, and c have been used, and all of them are constructed using a metal mesh screen.

Figure 2a shows a metal mesh screen wound into a pipe with a diameter (1 to 2 mm) that allows for capillary action. Different parts are arranged concentrically with a minute interval between them to create a capillary phenomenon, and both figures are supported by a metal mesh screen support 4.

What is C in Figure 2? A metal mesh screen formed into a gutter shape is spot welded or metal sewn onto a flat metal felt to form an arteri.

In this way, in the past, arteries were formed using metal mesh screens that were not easy to work with, making it impossible to make the shape uniform, and when manufacturing heat pipes in large quantities, each heat pipe In addition, spot welding must be done by sewing for support, and in the former case, the wick performance in the vicinity of the weld may deteriorate or local breakage may occur. In the latter case, there was a drawback that a great deal of labor and time was required.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional method, in which fine grooves are formed on the surface of a plate-shaped sintered wick, and these fine grooves are covered with a porous material. Accordingly, it is an object of the present invention to provide a method for forming an arteri of a heat pipe that can form an arteri easily, inexpensively, and uniformly.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 3, 5 is a plate-shaped sintered wick, that is, a sintered metal felt wick, and 5 is a lid wick 6 of the same shape.
are bonded and fixed to both surfaces.

This joined body is disposed between a working fluid evaporating section and a working fluid condensing section (not shown) of the heat pipe container 1, and is fixed to the circumferential groove wick 2 on both sides by welding or the like.

7 is a fine groove with a depth of 1-2 mm formed on both surfaces of the sintered metal felt wick 5 over its entire length, with one end opening in the evaporation section and the other end opening near the condensation section, respectively; The heat pipe container 1 is provided at or near the axial center.

This fine groove T is formed by machining on the surface of the sintered metal felt 5, and in order to cover the cut rear fine groove of this fine groove 7, the wick 5 of the lid wick 6 is bonded and fixed. This assembly is then installed inside the heat pipe container 1.

As the lid wick 6, it is preferable to use sintered metal, metal felt, etc. from the viewpoint of workability.

In this case, sintered metal felt wick 5 and lid wick 6
Bonding and fixing can be achieved by overlapping the two and resintering them.

Of course, since the lid wick 6 only needs to be plate-shaped, a metal mesh screen may be used as the lid wick 6.

The wick 5 can be made of sintered metal.

Further, the fine grooves 7 are formed by pressing a fine diameter quartz rod or ceramic rod against the surface of the metal felt wick 5 when sintering the metal felt wick 5, or by pressing a metal felt with a fine gap formed therein before sintering. It may be sintered to form the wick 5.

As described above, according to the present invention, fine grooves are formed on the surface of a plate-shaped sintered wick to the extent that a capillary phenomenon occurs, and a separate wick is simply bonded to the surface of the plate-shaped sintered wick. Since the arteries are formed by fixing and covering the fine grooves, the work is easier compared to the conventional method that requires bending of the metal mesh screen, and therefore there are no variations in the properties. Arteries can be formed at low cost without having to grow them.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional example of a heat pipe, Fig. 2 is a sectional view of a heat pipe showing a conventional example of Artery, and Fig. 3 is a sectional view of a heat pipe showing an embodiment of the present invention. It is. 1...Heat pipe container, 2...Peripheral groove wick, 5...Plate-shaped sintered body wick, 6...
... Lid wick, 7... Fine grooves. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. Fine grooves are formed on the surface of a plate-shaped sintered body wick, and a lid wick that covers the fine grooves is bonded to the surface, so that the circumferential groove wick on the inner periphery of the heat pipe container is formed on both sides. sticks to,
A method for forming a heat pipe by forming a heat pipe, characterized in that both ends of the fine grooves are opened toward an evaporating section and a condensing section of the working fluid of the heat pipe container. 2. The heat pipe according to claim 1, wherein a sintered body is used as the lid wick, and the lid wick and the plate-shaped sintered body wick are joined by overlapping and resintering. Niteri formation method. 3 Using a metal mesh screen as the lid wick,
2. The method of forming a heat pipe as claimed in claim 1, wherein the lid wick and the plate-shaped sintered body wick are fixed to each other by welding or sewing. 4. A heat pipe forming method according to claim 1, 2, or 3, wherein the fine grooves are formed by machining. 5. A heat pipe forming method according to claim 1, 2, or 3, characterized in that the fine grooves are formed during sintering of the plate-shaped sintered body wick.