JP2017172858A - heat pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pipe which increases intensity of a hydrogen permeation part while maintaining the speed of exhausting hydrogen to the outside from the inside of the heat pipe.SOLUTION: A heat pipe includes: a pipe in which water or a water solution is sealed; a through-hole penetrating the outside and inside of the pipe; and a hydrogen permeation part for closing the through-hole and for selectively permeating hydrogen to the outside of the pipe from the inside of the pipe. The hydrogen permeation part has a palladium layer and a porous body layer which is in contact with the palladium layer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat pipe.

  The heat pipe can be used as a heat transport means such as exhaust heat recovery. The heat pipe can be applied to a heat transport system such as warm-up, heating, or cooling. More specifically, it can be applied to, for example, a heat pipe system for warming up / heating that uses exhaust heat of an automobile for engine warming and air conditioning, or a cooling heat pipe system such as inverter cooling of an automobile. .

  The heat pipe has a configuration in which a working fluid such as water or an aqueous solution is sealed inside a hollow pipe made of metal or the like. It is known that the hydraulic fluid sealed inside the heat pipe may corrode the inner wall of the heat pipe and generate hydrogen inside the heat pipe. When hydrogen is generated inside the heat pipe, circulation of the working fluid inside the heat pipe is hindered, which may cause a problem that the heat transport function of the heat pipe is lowered.

  In order to prevent the heat transport function of the heat pipe from being deteriorated by hydrogen generated due to corrosion or the like inside the heat pipe, it is known to discharge the generated hydrogen to the outside of the heat pipe.

  The heat pipe disclosed in Patent Document 1 has a hydrogen permeable portion that penetrates the inside and the outside of the heat pipe. Then, the hydrogen generated inside the heat pipe through the hydrogen permeation part is discharged to the outside of the heat pipe. Moreover, palladium or its alloy is used as a hydrogen permeation | transmission part.

JP 58-86391 A

  In order to quickly discharge the hydrogen generated inside the heat pipe to the outside of the heat pipe, it is preferable that the hydrogen permeation portion is thin. However, when the hydrogen permeation part is thin, the strength of the hydrogen permeation part is lowered, and there is a problem that the hydrogen permeation part cannot withstand the internal pressure of the heat pipe and is damaged.

  On the other hand, when the thickness of the hydrogen permeable portion is increased in order to increase the strength of the hydrogen permeable portion, the speed of discharging hydrogen is reduced, and thus there is a problem that hydrogen generated inside the heat pipe cannot be sufficiently discharged.

  An object of this invention is to provide the heat pipe which increased the intensity | strength of the hydrogen permeation | transmission part, maintaining the speed | rate which discharges | emits hydrogen from the inside to the outside of a heat pipe.

Means for solving the problems of the present invention are as follows:
A pipe in which water or an aqueous solution is enclosed,
A through-hole penetrating the outside and inside of the pipe; and a hydrogen-permeating portion that closes the through-hole and selectively permeates hydrogen from the inside of the pipe to the outside of the pipe;
The hydrogen permeable part has a palladium layer and a porous layer in contact with the palladium layer.
heat pipe.

  ADVANTAGE OF THE INVENTION According to this invention, the heat pipe which increased the intensity | strength of the hydrogen permeation | transmission part can be provided, maintaining the speed | rate which discharges | emits hydrogen from the inside to the outside of a heat pipe.

FIG. 1 is a schematic cross-sectional view of a portion of a heat pipe according to one embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a hydrogen permeable portion of a heat pipe according to another embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of a portion of a heat pipe according to another embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail. The present invention is not limited to the following embodiments, and various modifications can be made within the scope of the gist of the invention.

  The heat pipe of the present invention includes a pipe in which water or an aqueous solution is sealed, a through-hole penetrating the outside and inside of the pipe, and a through-hole, and hydrogen is passed from the inside of the pipe to the outside of the pipe. It has a hydrogen permeation portion that allows selective permeation. The hydrogen permeable part has a palladium layer and a porous layer in contact with the palladium layer.

  Although not limited by the principle, it is considered that the operation principle of the present invention is as follows.

  When the palladium layer of the hydrogen permeable part is thickened to increase the strength of the hydrogen permeable part, the rate at which hydrogen is discharged from the inside of the heat pipe to the outside decreases, so the hydrogen generated inside the heat pipe is fully discharged. I can't.

  The present inventor applied a hydrogen permeable portion having a palladium layer and a porous body layer in contact with the palladium layer to the heat pipe, thereby preventing the hydrogen permeable portion of the heat pipe from being thickened without increasing the palladium layer of the hydrogen permeable member. It has been found that the strength of the hydrogen permeable portion is increased while maintaining hydrogen permeability.

  In the present invention, the hydrogen permeable part has a palladium layer and a porous layer in contact with the palladium layer. The porous layer functions as a support for the palladium layer and suppresses damage to the palladium layer due to the internal pressure of the heat pipe. Therefore, it is not necessary to thicken the palladium layer in order to increase pressure resistance, and the palladium layer can be thinned in order to increase hydrogen permeability.

  FIG. 1 is a schematic cross-sectional view of a portion of a heat pipe according to an embodiment of the present invention. In FIG. 1, the heat pipe of the present invention includes a through hole (40) passing through the outside (20) of the heat pipe and the inside (30) of the heat pipe, and a hydrogen permeable portion ( 50). The hydrogen permeable part (50) has a palladium layer (52) and a porous layer (54) in contact with the palladium layer (52). In FIG. 1, the palladium layer (52) is arranged in the inner (30) direction of the heat pipe, and the porous body layer (54) is arranged in the outer (20) direction of the heat pipe. The arrangement of the layer and the porous layer may be reversed.

<Heat pipe>
In the present invention, the heat pipe has water or an aqueous solution sealed inside the hollow pipe. The inner wall of the heat pipe may have a capillary structure.

<Water or aqueous solution>
In the present invention, the water or aqueous solution sealed inside the pipe absorbs heat outside the heat pipe at the heat absorption portion of the heat pipe and evaporates to become a gas, and from the gas to the liquid at the heat dissipation portion of the heat pipe. Aggregates and releases heat to the outside of the heat pipe.

  The water or aqueous solution enclosed inside the pipe can be selected, for example, according to the use conditions of the heat pipe, evaporates into a gas at the temperature of the heat absorption part of the heat pipe and the pressure inside the heat pipe, and It is possible to select one that aggregates and becomes a liquid at the temperature of the heat radiation portion of the heat pipe and the pressure inside the heat pipe.

<Pipe>
In the present invention, water or an aqueous solution is sealed inside the pipe. Examples of the material of the pipe include, but are not limited to, metals such as iron, aluminum, and copper.

  Further, the pipe has a through hole penetrating the outside and the inside of the pipe. The diameter (diameter) of the through hole may be 10 mm or less, 8 mm or less, or 6 mm or less, and may be 1 mm or more, 2 mm or more, or 4 mm or more.

<Hydrogen permeation part>
The hydrogen permeable portion is a member that blocks the through hole and can selectively permeate hydrogen from the inside of the pipe to the outside of the pipe. The hydrogen permeable part has a palladium layer and a porous layer in contact with the palladium layer.

  The hydrogen permeable part may be inserted and attached to the through hole of the heat pipe, or may be attached to the outer wall of the heat pipe so as to close the through hole of the heat pipe. A method for attaching the hydrogen permeable portion to the heat pipe is not particularly limited, and examples thereof include welding, brazing, and adhesion using an adhesive.

  The palladium layer of the hydrogen permeable part can be arranged to pass through the palladium layer when hydrogen inside the heat pipe is discharged to the outside of the heat pipe. The palladium layer may be arranged in the inner direction of the heat pipe and the porous body layer may be arranged in the outer direction of the heat pipe, but the arrangement of the palladium layer and the porous body layer may be arranged in the reverse order.

  The palladium layer is a layer containing palladium and can contain palladium or an alloy of palladium.

  The porous body layer is a porous layer and may contain a porous material. Examples of the porous material include materials such as zeolite, porous glass, silica gel, silica alumina, a ceramic filter, a ceramic honeycomb, and a metal sintered body. From the viewpoint of heat resistance, pressure resistance, impact resistance and the like, a metal sintered body is preferable. As the metal sintered body, a sintered body such as aluminum, copper, titanium, bronze, or stainless steel can be raised.

  The pore diameter of the porous body is not particularly limited as long as it has a diameter capable of supporting the palladium layer while allowing hydrogen to pass therethrough. The pore diameter of the porous body may be 10 μm or more, 25 μm or more, 50 μm or more, 75 μm or more, or 100 μm or more, and may be 200 μm or less, 175 μm or less, 150 μm or less, or 125 μm or less.

  The thickness of the porous body layer and the palladium layer is not particularly limited, but the thickness of the porous body layer has such a thickness that it is not damaged by the internal pressure of the heat pipe, and the thickness of the palladium layer is the heat pipe. It has a thickness that can sufficiently permeate hydrogen inside. The thickness of the palladium film may be 100 μm or less, 50 μm or less, 25 μm or less, 10 μm or less, or 5 μm or less, and may be 1 μm or more, 2 μm or more, 3 μm or more, or 4 μm or more.

  The hydrogen permeation part used in the heat pipe of the present invention can further have the structure shown in FIG.

  In FIG. 2, the hydrogen permeable part (50) has a palladium layer (52), a porous body layer (54), a case member (56), a thick palladium layer (58), and a sub chamber (59). The case member (56) has a palladium layer (52), a porous body layer (54), and a thick palladium layer (58) so that hydrogen can selectively permeate from the inside of the heat pipe to the outside of the heat pipe. Support. Further, on the inner side of the case member (56), a sub chamber (59) exists between the laminated body including the palladium layer (52) and the porous body layer (54) and the thick palladium layer (58). Further, the thick palladium layer (58) is exposed outside the heat pipe. The arrangement of the palladium layer (52) and the porous body layer (54) may be reversed.

  FIG. 3 is a schematic cross-sectional view of a part of the heat pipe having the hydrogen permeation section shown in FIG. As shown in FIG. 3, the hydrogen permeation section shown in FIG. 2 is arranged such that the thick palladium layer (58) is exposed to the outside (20) of the heat pipe.

  Since the hydrogen permeation section has a structure as shown in FIG. 2, hydrogen generated in the heat pipe is immediately discharged into the sub chamber (59) through the palladium layer (52) and discharged into the sub chamber (59). The released hydrogen is gradually released to the outside of the heat pipe through the thick palladium layer (58).

  In the hydrogen permeable part having the structure shown in FIG. 2, the palladium layer (52) and the porous body layer (54) are not exposed to the outside of the heat pipe. Thereby, it is possible to prevent the palladium layer (52) from being damaged by an impact or the like during manufacture of the heat pipe or installation in a vehicle, etc., and dust, dust, or droplets outside the heat pipe can be prevented. By entering the porous layer, it is possible to prevent the pores of the porous layer from being blocked.

DESCRIPTION OF SYMBOLS 10 Pipe 20 Outer side of heat pipe 30 Inner side of heat pipe 40 Through hole 50 Hydrogen permeation part 52 Palladium layer 54 Porous body layer 56 Case member 58 Thick palladium layer 59 Sub chamber

Claims (1)

A pipe in which water or an aqueous solution is enclosed,
A through-hole penetrating the outside and inside of the pipe; and a hydrogen-permeating portion that closes the through-hole and selectively permeates hydrogen from the inside of the pipe to the outside of the pipe;
The hydrogen permeable part has a palladium layer and a porous layer in contact with the palladium layer.
heat pipe.

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