JPS6042296Y2 - heat pipe - Google Patents

Description

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

As is well known, a heat pipe works by heating a working fluid such as water, ammonia, or nitrogen sealed inside a sealed tube from the outside to evaporate it, and after the vapor flows to the other end of the sealed tube, it radiates heat and condenses. , which transports heat as the latent heat of the working fluid, and by circulating the working fluid in a closed tube while repeating evaporation and condensation, heat transport can be carried out continuously without applying any particular driving force from the outside. It is possible.

By the way, in heat pipes, heat dissipation and condensed liquid phase working fluid is refluxed by capillary pressure through a wick provided in a sealed tube. Conventionally, the wick is a metal mesh, porous sintered metal, or the inner surface of the sealed tube. Although vertical grooves formed in the wick are known, the material making up the wick must generate high capillary pressure, form a flow path for refluxing the liquid phase working fluid, and have low flow resistance. In addition to these functions, there are other requirements such as not showing reactivity with various working fluids and being easy to manufacture and process, but although the metal mesh and sintered metal can form flow channels, A wick consisting of vertical grooves has a high flow resistance and is preferable because it has a low flow resistance, but on the other hand, there are problems in that the capillary pressure is low and workability is slightly inferior.

This idea was made in view of the above circumstances, and the purpose is to provide a heat pipe that has a novel wick that has not been seen before and also has a signal transmission function.

An embodiment of this invention will be described below with reference to the attached drawings. FIGS. 1 and 2 show an embodiment of this invention, in which an optical fiber bundle 2 is attached to the inner peripheral surface of a metal tube 1. The optical fiber bundle 2 is arranged along the axial direction of the metal tube 1 with both ends pulled out from both ends of the metal tube 1.
Since the glass fibers constituting the optical fiber bundle 2 have a circular cross section, gaps are formed between each glass fiber along the longitudinal direction.

The metal tube 1 is hermetically sealed by attaching end plates 3 through which the optical fiber bundle 2 passes through both ends thereof, and furthermore, an appropriate working fluid is sealed within the metal tube 1.

Note that the portion of each end plate 3 through which the optical fiber bundle 2 is penetrated and the spaces between the respective glass fibers of the optical fiber bundle 2 in the portion are made airtight by filling, for example, synthetic resin.

However, in the heat pipe having the above configuration, the metal tube 1
When heat is applied from the outside to one end, the internal working fluid evaporates, and the vapor flows through the metal tube 1 to the other end where it radiates heat and condenses, allowing heat to be transported as latent heat of the working fluid. .

In this case, since the width of the gap between the glass fibers constituting the optical fiber bundle 2 is quite narrow, a high capillary pressure can be generated, and the working fluid in the liquid phase is moved between the glass fibers by the capillary pressure. Circulation flows through the gap between the heat pipes as a flow path, but since the flow path runs along the length of the metal tube 1 and the surface of the glass fiber is smooth, the flow resistance is small, and therefore the heat pipe is According to this, since the optical fiber bundle 2 acts as a wick, a high heat transport capacity can be obtained as a whole.

In addition, in the above heat pipe, both ends of the optical fiber bundle 2 are pulled out from the metal tube 1, so if one end of the optical fiber bundle 2 is connected to a transmission light source and the other end is connected to a light receiving detector, , signal transmission can take place via the optical fiber bundle 2.

Note that heat pipes have a limited length due to capillary pressure, so there is a limit to the length that a single heat pipe can transport heat. Therefore, in order to transport heat over a long distance, multiple Two heat pipes are connected one after another with their ends butted against each other, and heat is transferred between each heat pipe by heat conduction through the end plates, and heat is transferred as latent heat of the working fluid within each heat pipe. All you have to do is configure it so that it does.

In this case, if the optical fiber bundle is arranged so as to pass through all the heat pipes, signal transmission can be performed without using any repeaters, as in the case described above.

FIG. 3 shows an application example of the heat pipe, in which the heat pipe is used as a part of an electric cable.

That is, a cable core 4 is arranged around the outer periphery of the heat pipe, an insulating layer 5 is provided on the outer periphery, and the whole is covered with a sheath 6.

In the electric cable nibble constructed in this way, the heat generated during power transmission is transferred to the heat pipe by exposing the end of the heat pipe HP at its end and connecting the end to an appropriate cooling part. By chance, the entire power cable can be cooled while being transported to this cooling section, and therefore the power transmission capacity of the power cable can be increased, and the optical fiber bundle 2 constituting the wick of the heat pipe HP It is possible to perform signal transmission without receiving electromagnetic induction via the .

As explained above, according to the heat pipe of this invention,
Since an optical fiber bundle is used as the wick, it is possible to form a flow path for liquid phase working fluid return that can receive high capillary pressure and has low flow resistance, thus obtaining a heat pipe with excellent heat transport ability. is possible,
In addition, since the optical fiber bundle is arranged with both ends pulled out from the end of the metal tube, the optical fiber bundle can not only act as a wick, but also allow signal transmission through the optical fiber bundle. There are effects such as being able to do it.

[Brief explanation of the drawing]

Fig. 1 is a schematic exploded perspective view showing one embodiment of this invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is an electric cable using the same dove as shown in Fig. 1. FIG. 1...Metal tube, 2...Optical fiber bundle,
3...End plate, HP...Heat pipe.

Claims (1)

[Scope of utility model registration request] An optical fiber bundle is attached to the inner circumferential wall of a metal tube along its axial direction, and both ends of the optical fiber bundle are pulled out from the end of the metal tube, and both ends of the metal tube are attached to an end plate. A heat pipe that is sealed with a metal tube and has a working fluid sealed inside the metal tube.