JPS61128095A - Heat pipe - Google Patents

Abstract

PURPOSE:To enable transfer of heat for a long distance by maintaining the temperature of a main heat pipe at a specified value, by a method wherein the title heat pipe is of a double pipe structure in that an outer heat pipe is located to the outside of a main heat pipe. CONSTITUTION:The title heat pipe comprises a main heat pipe 1 which has a wick constituting member 3 in an internal space 5 of a container filled with working fluid, an outer pipe 6 which is located outside the main heat pipe 1, is connected in an enclosed manner to the outer peripheral surface of the main heat pipe, and has length shorter than that of the main heat pipe, and ann outer heat pipe 2 which is formed such that an enclosed space 8 between the outer pipe 6 and the main heat pipe 1 is filled with working fluid. This constitution enables a wick to be easily formed in a long pipe, and permits provision of a heat pipe which permits heat to be transferred for a long distance.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention particularly relates to a heat pipe that enables long-distance heat transfer.

(Prior Art and Problems to be Solved) Conventional heat pipes are formed by sealing a working liquid such as water or methanol inside a container that is sealed at both ends of a copper pipe, stainless steel pipe, or the like.

When heat is transferred over a long distance using such a heat pipe, heat radiation or absorption occurs along the way, making it impossible to efficiently transfer the heat from the heat source to the destination remote location. For this reason, the extensive use of hot spring heat, sea water heat, etc. was limited due to distance, and was limited to within 100 meters at most.

Also, one of the problems with conventional heat pipes is the formation of wicks. That is, in the past, a wick was formed on the inner circumferential surface of a pipe. For example, when forming a groove wick, grooves were formed in the pipe by passing the grooves through a machine, which was limited to short pipes. In the case of a wick made of mesh or ultra-fine fibers, the diameter can be reduced by positioning a spiral body stretched into the mesh or fibers to reduce the diameter, inserting it into the pipe, and loosening the spiral body. This was an extremely difficult task as it required expanding and holding it against the inner wall of the pipe, making it unsuitable for long pipes.

(Means for Solving the Problems) The present invention solves the above-mentioned problems and provides a heat pipe that facilitates the formation of a wick in a long pipe and enables long-distance heat transfer. A main heat pipe having a wick component in the inner space of a container whose inner space is filled with a working liquid; It is characterized by comprising an outer pipe having a length shorter than the main heat pipe, and an outer heat pipe formed by sealing a working liquid in a sealed space between the outer pipe and the main heat pipe.

(Embodiment) FIG. 1 shows a longitudinal sectional view of an embodiment of a heat pipe according to the present invention. In the drawing, (1) is the main heat pipe, which is a container formed by sealing both ends of a copper pipe, stainless steel pipe, etc., like a conventional heat pipe. Although the heat absorption part (A) and the heat radiation part (B) of the main heat pipe (1) are equipped with fins Qz1, they are not necessarily required, and only one of them can be used. Sometimes it is set up.

■ is an external heat pipe, and an external pipe 0 of a shorter length such as a copper pipe or stainless steel pipe is placed outside the main heat pipe (1) with a part of it in contact with the main heat pipe (1). or, if necessary, arranged concentrically with an interval therebetween, and both ends (2) are hermetically connected to the outer circumferential surface of the main heat pipe (1) to form a sealed space (1) between the main heat pipe (1) and the main heat pipe (1). It is constructed by sealing the hydraulic fluid in a closed space (■).

(3) is the wick component of the main heat pipe (1),
In this example, an air-core pipe made of metal or hard plastic with both ends open (gl is from the heat absorption part (A) to the heat radiation part (B)
The main heat pipe (11) is placed on the bottom of the internal space (11) or concentrically placed with an appropriate spacer (not shown) as needed, and the air core pipe (9
) is filled with mesh or fibrous wick material.

Note that a heat insulating layer OD is provided on the outer surface of the above-mentioned heat pipe, if necessary, except for the heat absorption part (A) from the outside and the heat radiation part (B) to the outside.

FIG. 2 and FIG. 3 both show longitudinal cross-sectional views of other embodiments of the heat pipe according to the present invention, and in each embodiment, the main heat pipe (1) and the outer heat pipe (1)
The structure is the same as the embodiment shown in FIG. 1, and the only difference is the wick component (3).

Groove processing 04 is applied to the outer circumferential surface of the solid metal rod ql or air-core pipe placed on the bottom of the internal space ■ of the heat pipe (1) or placed via an appropriate spacer as necessary (see Fig. 4). ), or by fixing a mesh or fibrous wick material (+4') (Figure 4). Figure 4 (A) is an example of Groove Wick 04, which can be made by forming grooves on the outer surface of the solid metal rod 0e.
In the example of the wick according to 4'), it is sufficient to place these wick materials on the outer surface of the solid metal rod 011 and secure them by holding them down with a wick material, a band, a belt-like mesh, etc. in either case, and it is extremely easy to do. Furthermore, it can be applied continuously to long pipes.

In the embodiment shown in FIG. 3, the wick component (3) is a bundle of mesh or ultrafine fiber wick material Ocj and is placed at the bottom of the internal space (2) of the main heat pipe (1), or is placed in an appropriate manner as necessary. They are arranged through spacers, and can be applied to a long pipe very easily and continuously in the same way as in the embodiment shown in FIG.

In addition, in any of the embodiments shown in Figs. 1 to 3 above, if the outer heat pipe (2) requires a wick, the main heat A wick (14') to which groove wick A4, Metsu/Yu, or ultrafine fibers are fixed is provided on the outer circumferential surface of the pipe (1), and the method that can be easily and continuously applied to a long pipe is as follows. As mentioned above. Furthermore, depending on how the heat pipe is used or the type of heat pipe, it may be preferable to provide the wick only on a portion of the pipe, and it is extremely easy to provide the wick on a portion of the pipe in this way.

In the embodiments shown in Figures 1 to 3, it is preferable that the main heat pipe (1) and the outer heat pipe (2) be supported via a suitable spacer that does not inhibit the movement of the working fluid. By corrugating the material, it becomes flexible and can be wrapped in a drum in the same way as a cable, making it easier to create a long heat pipe.

(Effects of the Invention) According to the above-described heat pipe of the present invention, it has a double pipe configuration in which the outer heat pipe is provided outside the main heat pipe, so the outer heat pipe becomes the thermal resistance of the main heat pipe. At the same time, since the external heat pipe can transfer heat from the heat source to the main heat pipe to keep it warm, the temperature of the main heat pipe can be maintained at a substantially constant level, making it possible to transfer heat over long distances.

In addition, since it is not necessary to apply wicks to the inner circumferential surface of the pipes for both the main heat pipe and the outer heat pipe as described above, it is extremely easy to perform, and it is also easy to implement long pipes or form partial wicks. .

[Brief explanation of the drawing]

1 to 3 are longitudinal sectional views of an embodiment of the heat pipe according to the present invention, and FIG. 4U) and (e'l are explanatory views of an example of wick formation. 1... Main Heat pipe, 2...Outside heat pipe, 3
... Wick component, 4... Main heat pipe container, 5... Internal space, 6... Outer pipe, 8... Sealed space, 9... Air core pipe, 10... Wick material,
11... Heat insulation layer, 13... Solid metal rod, +5...
Wick timber east.

Claims (6)

[Claims] (1) a main heat pipe including a wick component in the internal space of a container whose internal space is filled with a working liquid;
An outer pipe having a length shorter than the length of the main heat pipe is provided on the outside of the main heat pipe, the end of which is hermetically connected to the outer peripheral surface of the main heat pipe, and the heat pipe operates in a sealed space between the outer pipe and the main heat pipe. A heat pipe characterized by comprising an outer heat pipe formed by sealing a liquid. (2) The heat pipe according to claim 1, wherein the wick component of the main heat pipe is constructed by filling a mesh or fibrous wick material into an air-core pipe with both ends open. (3) The wick component of the main heat pipe is constructed by applying groove processing to the outer peripheral surface of a solid metal rod or an air-core pipe, or by fixing a mesh or fibrous wick material to the outer peripheral surface of the solid metal rod or air-core pipe. The heat pipe described in item 1. (4) The heat pipe according to claim 1, characterized in that the wick component of the main heat pipe is made up of a bundle of mesh or fibrous wick material. (5) The heat pipe according to claim 1, wherein the wick of the outer heat pipe is formed on the outer peripheral surface of the main heat pipe. (6) The heat pipe according to claim 1, characterized in that a heat insulating layer is formed on the outer surface of the heat pipe except for the parts that absorb heat from the outside and radiate heat to the outside.