JP2688617B2 - heat pipe - Google Patents

Description

The present invention relates to a structure of a long heat pipe that can be used in a vertical state.

(Prior Art) (Problems to be Solved by the Invention) A conventionally known structure of a heat pipe is such that a wick layer is provided inside a metal extruding or drawing pipe, etc. A typical structure is a sealed structure.

However, it is good to manufacture a metal tube by extrusion or drawing, but the thinner and longer the pipe is, the more difficult it is to provide a wick layer inside, and in order to solve this difficulty, we have squeezed the wick on one side of the metal tape. It was proposed that a layer was formed in advance, which was rolled by a vertical roll or wound by wrapping, and the side edges of the tape were airtightly joined by means such as welding or adhesion.

However, although this structure has been improved as a manufacturing technique, it has the drawback that the working fluid is less likely to stay in the wick and it is mechanically weak because it is a tape-molded tube. A long heat pipe that can be installed almost vertically in order to utilize the above has not appeared to date, and its solution is expected.

(Means for Solving the Problem) The present invention has been made to solve the above-mentioned problems, and the size of the wave of the outer convex portion is changed to the inner concave portion in the radial direction or the oblique direction around the pipe. The heat pipe is characterized by having an Ω-shaped waveform that is larger than the size of the wave.

(Operation) The mechanical strength of the heat pipe is increased by the above-mentioned structure, and as a result of having a large void on the inner surface of the pipe over the entire length of the pipe, the working fluid is positively retained, which is particularly remarkable in the vertical use state of the heat pipe. With a long heat pipe that pumps up geothermal heat, there is a special effect that the working fluid is distributed over a wide range in a long endothermic part.

(Example) Hereinafter, the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view of an example of a heat pipe obtained by the present invention, 1 is a pipe made of a metal tape, 2 is a wick on the inner surface of the pipe, 3 is a pipe, and 3a and 3b are radial or oblique of the pipe. Grooves formed by Ω-shaped ridges and grooves provided in rows are provided so that Wb <Wa when the widths are Wa and Wb, respectively.

Here, Wa is 1.01 to 5 times, preferably 1.1 to 2 times Wb. This is the inner diameter of the pipe, wall thickness, operating temperature,
It is determined in consideration of the heat transport amount.

In the pipe having such a structure, there is no fear that the wick 2 attached to the inner surface, particularly on the Wa side, will be separated during the processing stage, and there is a reinforcing effect against the crushing force from the outside.
Has a large space inside, so the working fluid traveling along the wall surface inside the heat pipe is sufficiently stored in the inner space, and the heat from the outside of the pipe is quickly transferred to the remaining working fluid. Therefore, the thermal efficiency can be improved.

In particular, the effect is remarkable in the vertical use state of the heat pipe, and there is a special effect in distributing the working fluid in a wide range in a long endothermic portion in a long heat pipe that pumps up geothermal heat.

Next, a manufacturing example of the heat pipe of the present invention will be described with reference to the drawings.

As shown in FIG. 2, the metal tape 1 is delivered from the delivery reel.

The metal tape 1 is made of copper, aluminum, iron, stainless steel, etc., and has a width of 30 to 450 mm and a thickness of 0.2 to 2.0 m.
The m type is selected and used according to the intended heat pipe design.

This metal tape is subjected to wavy processing in the shape of Ω as shown in FIG. 1 at a predetermined position in consideration of the case of vertical attachment or wrapping.

This corrugation is carried out by a corrugating machine 11 such as a corrugating roll, and then an adhesive is applied to the upper surface of the metal tape 1 by an adhesive applicator 12, and a wick material is sprinkled by a wick material supply device 13 on this. , A wick layer is formed after forming a wick layer, and is formed into a circular shape by a forming device 15, and the joining edge of the metal tape 1 is airtightly joined by welding or adhesion by a joining device 16 such as a welding device. Get a heat pipe. The corrugating machine 11 has been described as an example in which the corrugating machine 11 is positioned at the first processing stage of the metal tape 1. However, it goes without saying that the corrugating processing may be performed after the circular upper joining device 16 has passed. Is.

(Effects of the Invention) In the present invention, it is essential that the Ω-shaped corrugation of Wb <Wa is provided as shown in FIG. 1, which allows the external projection to be large and the wick to be formed in a large space. Because it has a working fluid, it also has a reinforcing effect against crushing by quickly transferring heat from the outside, and at the same time maximizes the action of the working fluid. It is possible to provide an excellent heat pipe, in particular, a long heat pipe that is installed almost vertically in order to utilize geothermal heat and the like.

[Brief description of the drawings]

FIG. 1 is a partial vertical sectional view showing an example of a heat pipe of the present invention, and an explanatory view showing its manufacturing line in FIG. 1: Metal tape, 2: Wick, 3: Ω-shaped waveform 3a: Convex part, 3b: Recessed part, Wa: 3a width Wb: 3b width, 12: Adhesive applicator 13: Wick material supply device, 14: Presser roll 15: Forming device, 16: Joining device

Front Page Continuation (72) Inventor Koichi Masuko 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Electric Wire Co., Ltd. (56) Reference JP 56-133593 (JP, A) JP 48-85469 ( JP, A)

Claims (1)

(57) [Claims] 1. A heat pipe comprising a pipe in which metal tapes are joined at seams and a wick layer on the inner surface of the pipe, the size of the wave of the outward convex portion in the radial direction or the oblique direction around the pipe. A heat pipe characterized by having an Ω-shaped corrugation in which the width is larger than the wave size of the inward recess.