Patent ID: 7261142
Filing Date: 2007-08-28
Classification: F28D

Abstract:
1. A heat pipe comprising a condensable, liquid phase working fluid encapsulated in a container sealed in an air-tight condition and a wick provided in the container composed of a porous body sheet for refluxing the condensable, liquid phase working fluid by a capillary pressure to an evaporating part of the container, in which a part of the container functioning as the evaporating part for evaporating the condensable, liquid phase working fluid by means of inputting heat from outside, and in which another part of the container functions as a condensing part for condensing a vapor of the condensed working fluid by means of radiating heat to the outside: wherein the container is constructed to have a flat thin-shaped section comprising a top face and a bottom face; wherein the porous body sheet is arranged on the bottom face of the container; wherein a direct reflux flow passage has a flow cross-sectional area greater than that of a cavity formed in a wick, the direct reflux flow passage is formed from the condensing part to the evaporating part in the container and the direct reflux flow passage is formed between the porous body sheet and an inner face of the container where the porous body sheet is mounted; wherein the direct reflux flow passage is formed on the inner face of the container and the porous body sheet is mounted thereon to close an opening of the direct reflux passage; wherein the direct reflux flow passage includes a thin slit or thin slits formed on the surface of the porous body sheet; and wherein a clearance between the thin slits in the width direction of the porous body sheet changes flexibly in accordance with the change in width of the porous body sheet.