Heat pipe structure

Abstract

A heat pipe structure includes a first tubular body and a second tubular body. The first tubular body has a first chamber and a working fluid. A first capillary structure is disposed on outer circumference of the second tubular body. The second tubular body is disposed in the first chamber and has a second chamber. In the heat pipe structure, the vapor-phase working fluid flows within the first chamber, while the liquid-phase working fluid flows within the second chamber in separation from the vapor-phase working fluid. Accordingly, the impedance against the vapor is greatly reduced and the heat transfer efficiency is greatly enhanced to achieve excellent heat dissipation effect.

What is claimed is: 
     
         1 . A heat pipe structure comprising:
 a first tubular body having a first chamber and a working fluid;   a second tubular body disposed in the first chamber and having a second chamber; and   a first capillary structure disposed on outer circumference of the second tubular body.   
     
     
         2 . The heat pipe structure as claimed in  claim 1 , wherein a second capillary structure is disposed in the first chamber. 
     
     
         3 . The heat pipe structure as claimed in  claim 1 , wherein the first tubular body has an evaporation end at one end for contacting at least one heat source and a condensation end at the other end opposite to the evaporation end. 
     
     
         4 . The heat pipe structure as claimed in  claim 1 , wherein the first capillary structure is selected from a group consisting of a sintered powder body, a structure formed with multiple channels, a mesh body and a coating. 
     
     
         5 . The heat pipe structure as claimed in  claim 2 , wherein the second capillary structure is selected from a group consisting of a sintered 
     
     
         6 . The heat pipe structure as claimed in  claim 1 , wherein the working fluid is selected from a group consisting of pure water, coolant and acetone. 
     
     
         7 . The heat pipe structure as claimed in  claim 1 , further comprising a first section and a second section disposed at two ends of the first tubular body respectively, the first and second sections communicating with the first and second chambers.