Heat pipe manufacturing method and heat pipe thereof

Abstract

A heat pipe includes a step pipe and a sintered powder structure. The inner wall of the step pipe has a plurality of grooves. The step pipe has an evaporating section and two condensing sections. The condensing sections are on the two ends of the step pipe, respectively. The evaporating section lies between the two condensing sections. The inner spaces of the two condensing sections and the evaporating section are interconnected. The peripheral dimension of the evaporating section is larger than the peripheral dimension of each of the condensing sections. The sintered powder structure is bounded inside each of the condensing sections, improving the heat pipe's inner air flow rate and heat conduction efficiency.

1 . A method of manufacturing a heat pipe, comprising:
 a) providing a hollow pipe, an inner wall of the hollow pipe having a plurality of grooves;   b) shrinking a part of the hollow pipe so as to convert the hollow pipe into a step pipe having varying peripheral dimensions;   c) inserting an insertion rod into the step pipe, and filling a metal powder into a space between the step pipe and the insertion rod; and   d) after step c), sintering the step pipe and the insertion rod so as to form a sintered powder structure on an inner wall of the step pipe;   
     
     
         2 . The method of  claim 1 , further comprising a step e) of sealing the step pipe, filling in a working fluid, and degassing the step pipe after step d). 
     
     
         3 . The method of  claim 2 , further comprising a step f) of flatting the step pipe after step e). 
     
     
         4 . A heat pipe, comprising:
 a step pipe, wherein the step pipe's inner wall has a plurality of grooves, the step pipe has an evaporating section and two condensing sections, the two condensing sections are formed on two ends of the step pipe, respectively, the evaporating section lies between the two condensing sections, inner spaces of the two condensing sections and the evaporating section are interconnected, and a peripheral dimension of the evaporating section is larger than a peripheral dimension of each of the condensing sections; and   a sintered powder structure, bounded inside at least one of the condensing sections.   
     
     
         5 . The heat pipe of  claim 4 , wherein the heat pipe is a straight step pipe with round traverse sections. 
     
     
         6 . The heat pipe of  claim 4 , wherein the heat pipe is a straight step pipe with flat traverse sections. 
     
     
         7 . The heat pipe of  claim 4 , wherein each of the grooves is parallel to an axis of the step pipe. 
     
     
         8 . The heat pipe of  claim 4 , wherein the sintered powder structure adheres to each of the grooves within the evaporating section. 
     
     
         9 . The heat pipe of  claim 4 , wherein the sintered powder structure adheres to each of the grooves within at least one of the condensing sections. 
     
     
         10 . The heat pipe of  claim 4 , wherein the evaporating section is round, semicircular, or flat. 
     
     
         11 . The heat pipe of  claim 10 , wherein the condensing sections are round or flat. 
     
     
         12 . The heat pipe of  claim 4 , further comprising a working fluid, the working fluid being filled inside the step pipe. 
     
     
         13 . The heat pipe of  claim 4 , further comprising a mesh, the mesh being contained inside the evaporating section. 
     
     
         14 . The heat pipe of  claim 13 , further comprising a supporting component, the supporting component being contained inside the mesh and contacting the mesh. 
     
     
         15 . The heat pipe of  claim 14 , wherein the supporting component is a helical spring.