JPS58156191A - Manufacturing method of Utsuk type heat pipe - Google Patents

Abstract

PURPOSE:To stabilize the quality of the titled heat pipe by a method wherein a wick and an elastic tube are inserted into a blank heat pipe and the tube is expanded by introducing a fluid pressure so that the wick is adhered closely and uniformly to the wall surface of the blank heat pipe. CONSTITUTION:The wick 2 is inserted into the blank heat pipe 1, the elastic tube 3 is expanded by introducing a fluid pressure P into the tube 3 so that the wick 2 is adhered closely to the inner wall surface of the blank heat pipe 1. Further, as a material for tube 3, rubber is the best and for the pressure fluid, water and air most suitable. Next, the tube 3 opens at both ends thereof and the open ends may are be connected to a pressure device or alternatively, only one open end of the tube may be connected to the pressure device while the other end is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of bringing a wick into close contact with the inner wall surface of a heat pipe base tube in manufacturing a wick type heat pipe.

Wick-type heat pipes have a wick on the inner wall of a metal heat pipe element tube, seal a working fluid inside, and use the capillary action of the wick to return the working fluid that condenses in the heat dissipation section to the heating section. It performs a heat transfer action. Various wicks are used, but
Wire mesh is often used.

In order to make this wire mesh-like wick adhere tightly to the inner wall of the heat pipe, the wick is rolled up and inserted into the heat pipe, and then a round bar is pushed into the inner wall of the heat pipe. The method used is to expand the wick and bring it into close contact with the inner wall of the heat pipe.

In addition, a core core wire having plasticity and a wick wound around it are inserted into the inner surface of the heat pipe material tube, and the core wire is pulled out as one piece to bring the wick into close contact with the inner wall surface of the heat pipe material tube.
Thereafter, a method of dissolving and removing the core wire is also used. These are so-called mechanical methods that ensure uniform contact between the inner wall surface of the heat pipe element and the wick.
Further, foreign matter such as metal powder is likely to be generated.

The present invention was made to improve this point, and after inserting a tube made of an elastic body and a wick inside a heat pipe raw tube, fluid pressure is introduced into the tube to expand the cheap. The gist of the present invention is a method for manufacturing a wick-type heat pipe, which is characterized by bringing the wick into close contact with the inner wall surface of the heat pipe element tube.

The following explanation will be given based on the drawings. First, as shown in FIG. 1, the wick 2 is inserted inside the heat pipe element tube l.

Next, as shown in FIG. 2, a tube 3 made of an elastic body is inserted into the inside of the wick 2, and as shown in FIG. 3, fluid pressure P is introduced into the tube 3 to inflate the tube 3. 2 is brought into close contact with the inner wall surface of the heat pipe element tube l. The optimal material for the tube 3 is rubber, and the optimal pressurized fluid is water or air. Moreover, the tube 3 is the second tube.
As shown in Figure 3, both ends may be open and both ends connected to the pressurizing device, but as shown in Figure 4 as tube 3', one end may be closed and only one end connected to the pressurizing device. You may also connect it to

A protective film such as resin may be provided on the surface of the tube for the purpose of protecting the surface of the cheep 3 or 3' and preventing foreign matter such as peeled off material from the tube from adhering to the wick. however,
This membrane must not affect the expansion and contraction of the tube.

In addition to the above method, first wind the wick 2 around the tube 3 and insert it into the heat pipe raw tube 1,
The same thing is true even if you expand it.

As described above, since the present invention applies a fluid pressure tube expansion method instead of a mechanical method, the state of close contact of the wick to the inner wall surface of the heat pipe element tube 1 is uniform, and the fluid pressure can be adjusted appropriately. This also improves the degree of adhesion. Once the optimum internal pressure is set, the degree of expansion remains constant.
The adhesion is stable and the quality is stable. Furthermore, since there is no mechanical contact, there is little generation of foreign matter such as metal powder, and the wick will not be damaged.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the state in which the wick is inserted into the heat pipe element tube, Figure 2 is a cross-sectional view of the state in which the tube 3 is further inserted, Figure 3 is a cross-sectional view of the state at the time of pressurized expansion, and Figure 4. 1 and 2 show cross-sectional views of modified examples of the tube, respectively. l... Heat pipe raw tube 2... Wick 3.3
'... Tube patent applicant Sumitomo Light Metal Industries Co., Ltd. Patent attorney Hidetaka Komatsu 10 ':;'J 4 Figure 1

Claims (1)

[Claims] After inserting a tube made of an elastic body and a wick inside the heat pipe material tube, fluid pressure is introduced into the tube to expand the tube and bring the wick into close contact with the inner wall surface of the heat pipe material tube. A method for manufacturing a wick type heat pipe characterized by the following.