JPS6315518B2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to heat pipes.

Conventionally, a porous pipe is attached to the inner surface of a closed container, and a working fluid is sealed inside the container. By heating one end of the container (evaporation section), the working fluid evaporates and the other end (condensation section) is heated. The working fluid flows to the evaporator section, where it releases heat, condenses and liquefies, and returns to the evaporator section through the capillary pressure, and as a result, a large amount of heat is converted into latent heat of the working fluid and transferred from the high temperature section. A heat pipe that transports heat to a low-temperature area is known. Conventional heat pipes are generally constructed as elongated hollow tubular bodies with a circular or polygonal cross section because the working fluid is heated and turned into steam, which increases the internal pressure. However, in the case of conventional heat pipes, in order to transport heat from a large area of high temperature area to a large area of low temperature area, many heat pipes must be arranged in parallel. The amount of heat is transported between a wide area through a so-called linear heat transport path, that is, a heat pipe, and the amount of heat is not transported between high and low temperature parts through a heat transport path over a wide area. Therefore, thermal efficiency was poor, and as the heat pipes came close to each other, the heat inflow area or heat outflow area of each heat pipe became narrow, resulting in a reduction in the thermal efficiency of the parallel heat pipes as a whole. .

Heat transfer plates or heat transport devices that solve these problems have been proposed in Japanese Patent Application Laid-open Nos. 52-90852 and 55-51293, but these methods do not use hollow flat containers. Because it is a container, it lacks strength against fluctuations in internal pressure, and as a result, the container may deform, crack, or even break. However, with such a structure, a problem arises in that it is difficult to attach the support to the inner surface of the container.

In view of the above circumstances, it is an object of the present invention to provide a heat pipe that has a sufficiently high container strength, is easy to manufacture, and has good heat transfer efficiency.

An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, the container 1 is constructed as a thin plate-like hollow body made of a thin metal plate and having a width w wider than a thickness t, as shown in the drawings. A large number of reinforcing plates 2 are provided on each of the upper and lower surfaces of the container 1 because these surfaces have a large area and are vulnerable to increases in internal pressure. It is supported by a large number of spiral metal wires 4. That is, the wire 3 is formed of a substantially porous structure such as a metal net or a metal fiber bundle,
The spiral metal wires 4 are arranged along the inner surface of the container 1, and the spiral metal wires 4 are arranged parallel to each other along the longitudinal direction of the container 1 on the inner surface of the wick 3 in an elastically curled state. metal wire 4
tries to expand with its own elastic force, thereby pressing and fixing the wick 3 against the inner surface of the container 1, and at the same time, the inner circumferential side of the spiral metal wire 4 becomes hollow, thereby forming a steam flow path 5 here. There is. An appropriate working fluid is sealed inside the container 1 configured as described above.

When the heat pipe configured as described above is arranged so that one longitudinal end of the heat pipe is located in the high temperature range and the other end is located in the low temperature range, the working fluid is located at one end (evaporation part) in the high temperature range. The vapor is evaporated at V and flows through the vapor flow path 5 to the other end (condensation section) C side in the low temperature region, where heat is released and the vapor is condensed and liquefied, changing from the high temperature region to the low temperature region. heat is transported to The condensed and liquefied working fluid then enters the wick 3 and returns to the evaporation section V due to capillary pressure.

Therefore, in the heat pipe having the above structure, both the evaporating section V and the condensing section C have a large area, and the working fluid transforms into a multi-stream vapor flow within the container 1 to transport heat. Therefore, heat can be efficiently transported even when the condensing part C is used as a surface heat source. In addition, since the heat pipe has reinforcing plates 2 protruding from its outer surface, particularly on both the upper and lower surfaces, even if the pressure inside the container 1 increases due to evaporation of the working fluid, the container 1 will not swell abnormally. Cracks do not occur, and the reinforcing plate 2 acts as a fin for the evaporating section V or the condensing section C to expand its surface area, so that the heat transfer coefficient is further improved.

In the above embodiment, the wick 3 is fixed to the inner surface of the container 1 with the spiral metal wire 4, and at the same time
Although the steam flow path 5 is formed along the longitudinal direction of the wick, the present invention is not limited to the above embodiment. For example, instead of the spiral metal wire 4, a flat wick may be erected between the upper and lower wicks 3. Container 1
The container 1 may support the wick 3 attached to the inner surface of the container 1, and at the same time, the passage defined in the container 1 by the erected wick may be used as a steam flow path. Further, the structure of the wick may be either a homogeneous wick structure made of a single material such as a metal net, or a composite wick structure made of a plurality of materials.

As explained above, according to the heat pipe of the present invention, the heat pipe itself has a thin plate shape, and both the evaporation section and the condensation section have a large area, and unlike conventional heat pipes, the heat transport route is linear. Because it is a planar shape with a certain extent of expansion, it is possible to efficiently transport heat from a high temperature range to a heat source as a planar surface.Also, since a reinforcing plate is provided protruding from the outer surface of the container, the container can be made into a thin plate-like hollow structure. In addition to fully compensating for the decrease in strength due to the structure, the reinforcing plate acts as a fin, increasing the area between the evaporation part and the condensation part, improving heat transfer efficiency, and further improving the inner surface of the container. Since there are no protrusions for reinforcement, it is easy to attach a wick and it is easy to manufacture.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a partially cutaway perspective view, and Fig. 2 is a - of Fig. 1.
FIG. 3 is a partially omitted cross-sectional view taken along the - line in FIG. 1. 1... Container, 2... Reinforcement plate, 3... Wick, 5... Steam flow path.

Claims (1)

[Claims] 1. A steam flow path that is continuous from one end to the other end is formed in a thin plate-like hollow container that is wider than its thickness, and a wick is arranged in parallel with this steam flow path, and A heat pipe characterized in that a working fluid is sealed in the heat pipe so that the heat pipe is kept in a wet state, and a large number of thin reinforcing plates are protruded from both upper and lower surfaces of the heat pipe.