Heat pipe

Abstract

A heat pipe includes a hollow metal casing and a wick structure arranged at an inner surface of the hollow metal casing. A part of the inner surface of the hollow metal casing is covered with the wick structure and other parts of the inner surface are uncovered with the wick structure.

1 . A heat pipe comprising:
 a hollow metal casing; and   a wick structure layer arranged at an inner surface of the hollow metal casing, wherein a part of the inner surface of the hollow metal casing is covered with the wick structure, and other parts of the inner surface of the hollow metal casing uncovered with the wick structure.   
   
   
       2 . The heat pipe as claimed in  claim 1 , wherein the hollow metal casing is a cylindrical pipe, and the wick structure is arranged on part of the inner surface of the hollow metal casing along a circumferential direction. 
   
   
       3 . The heat pipe as claimed in  claim 2 , wherein the wick structure is arranged on half of the inner surface of the hollow metal casing along a circumferential direction. 
   
   
       4 . The heat pipe as claimed in  claim 2 , wherein the wick structure is continuously arranged on the inner surface of the hollow metal casing along an axial direction. 
   
   
       5 . The heat pipe as claimed in  claim 1 , wherein the wick structure is a sintered copper powder layer. 
   
   
       6 . The heat pipe as claimed in  claim 1 , wherein a plurality of spiral micro-channels is defined in the inner surface of the hollow metal casing. 
   
   
       7 . The heat pipe as claimed in  claim 6 , wherein the wick structure covers on the micro-channels and a maximum thickness of the wick structure is larger than a depth of the micro-channels.