Heat pipe

Abstract

A heat pipe ( 10 ) includes a metal casing ( 12 ) having a closed end ( 14 ) and a sealed end ( 16 ) located opposite to the closed end. The sealed end of the heat pipe includes a cramped section ( 16 a ) having a wave-shaped cross-section. A device for sealing an open end ( 16 a ) of the heat pipe includes a pair of clamping blocks ( 26 ) for clamping the open end of the heat pipe in a first direction and a pair of pressing blocks ( 22, 24 ) located at opposite sides of the open end of the heat pipe and being capable of moving towards each other, thereby approaching the open end of the heat pipe in a second direction perpendicular to the first direction. The pressing blocks have a pair of complementary wave-shaped forming faces ( 22 a, 24 a ) formed thereon.

1 . A heat pipe comprising a metal casing having an integrally closed end and a sealed end located opposite to the closed end, the sealed end including a cramped section having a wave-shaped cross-section.  
   
   
       2 . The heat pipe of  claim 1 , wherein the cramped section has an S-shaped cross-section.  
   
   
       3 . The heat pipe of  claim 1 , wherein the cramped section is symmetric with respect to a longitudinal axis of the metal casing.  
   
   
       4 . The heat pipe of  claim 1 , wherein the cramped section is centrally aligned with a longitudinal axis of the metal casing.  
   
   
       5 . The heat pipe of  claim 1 , wherein the sealed end further includes a tapered section, the tapered section being located between the metal casing and the cramped section.  
   
   
       6 . A device for sealing an open end of a heat pipe comprising: 
 a pair of clamping blocks for clamping the open end of the heat pipe in a first direction; and    a pair of pressing blocks located at opposite sides of the open end of the heat pipe and being capable of moving towards each other, thereby approaching the open end of the heat pipe in a second direction perpendicular to the first direction, the pressing blocks having a pair of complementary wave-shaped forming faces formed thereon.    
   
   
       7 . The device of  claim 6 , wherein each of the complementary wave-shaped forming faces has an S-shaped configuration.  
   
   
       8 . A heat pipe comprising: 
 a casing having an integrally closed end near an evaporating portion of the heat pipe and a cramped sealed end near a condensing portion of the heat pipe, wherein the cramped sealed end has a wave-like cross section.    
   
   
       9 . The heat pipe of  claim 8 , wherein the wave-like cross section has an S-shaped configuration.  
   
   
       10 . The heat pipe of  claim 9 , wherein the S-shaped sealed end is centrally aligned with a longitudinal axis of the casing.  
   
   
       11 . The heat pipe of  claim 10  further comprising a tapered section adjacent to the cramped sealed end.