Heat transport device

Abstract

A heat transport device having enhanced heat transport capacity is provided. The heat transport device comprises an evacuated and sealed container 2 , and phase changeable working fluid encapsulated in the container to transport heat a fiber wick 3 is laid on an inner face of the container 2 in a longitudinal direction, and a powder wick is formed on a surface of the fiber wick 3 . A thickness of the powder wick is five to ten times smaller than a diameter of the fiber.

What is claimed is: 
     
         1 . A heat transport device, comprising:
 a sealed container from which air is evacuated;   a working fluid that is encapsulated in the container, and that circulates within the container while being evaporated by being heated and condensed by removing heat therefrom;   a fiber wick that is formed by bundling a plurality of fibers, and that is laid on an inner face of the container in a longitudinal direction; and   a powder wick that is formed on a surface of the fiber wick by depositing particles whose grain diameters fall within a range between 5 to 10 μm that is five to ten times smaller than a diameter of the fiber;   wherein a thickness of the powder wick is one to five times larger than the grain diameter of the particle.   
     
     
         2 . The heat transport device as claimed in  claim 1 ,
 wherein the sealed container includes a heating site heated by an external heat, and a cooling site from which the heat is radiated to outside, and   wherein the powder wick is formed from the surface of the fiber wick to an inner surface of the heating site of the container.   
     
     
         3 . The heat transport device as claimed in  claim 1 , wherein the powder wick is formed entirely on the inner face of the sealed container except for a portion on which the fiber wick is laid. 
     
     
         4 . The heat transport device as claimed in  claim 1 , wherein a diameter of the fiber is 50 μm at smallest, and a grain diameter of the particle is 10 μm at largest. 
     
     
         5 . The heat transport device as claimed in  claim 3 ,
 wherein the sealed container is made of metal material;   wherein the fibers and the particles include metal fibers and metal particles; and   wherein the metal fibers and the metal particles are fixed to an inner face of the container by a sintering method.   
     
     
         6 . The heat transport device as claimed in  claim 1 , wherein the sealed container includes a flat container having a larger width than a thickness.