Heat pipe with flat end and method of manufacturing the same

Abstract

The invention is to provide a method for making a heat pipe with a flat end. The method comprises the steps of (a) providing a first tube, including a first open end and a second open end; (b) providing a second tube, including a third open end and a flat closed end; (c) seal jointing the second open end of the first tube and the third open end of the second tube to form a third tube; (d) forming a porous capillary diversion layer on the inner wall of the third tube; (e) injecting a working fluid into the third tube; (f) vacuuming the third tube, and (g) sealing the first open end.

1 . A method for making a heat pipe with a flat end, the method comprising the steps of:
 (a) providing a first tube having a first open end and a second open end;   (b) providing a second tube having a third open end and the flat end;   (c) sealing the second open end and the third open end to form a third tube;   (d) vacuuming the third tube; and   (e) sealing the first open end;   
     wherein an inner wall of the third tube comprises a multi-hole capillary conducting layer and the third tube contains a working fluid. 
   
   
       2 . The method of  claim 1 , wherein the working fluid is injected into the third tube before or after the step (d) is performed. 
   
   
       3 . The method of  claim 1 , wherein in the step (b), the second tube is made by a powder metallurgy process, a punching process, an injection molding process, a casting process, or a machining process. 
   
   
       4 . The method of  claim 1 , wherein the multi-hole capillary conducting layer is made by the steps of:
 putting a first metal powder into the third tube;   inserting a center bar into the third tube from the first open end and the center bar being against the first metal powder;   infilling a second metal powder between the center bar and the third tube;   performing a sintering process for welding the first metal powder and the second metal powder to form the multi-hole capillary conducting layer; and   drawing out the center bar from the third tube.   
   
   
       5 . The method of  claim 4 , wherein the first metal powder/the second metal powder is a copper powder, a nickel powder, a silver powder, a copper-plated powder, a nickel-plated powder, or a silver-plated powder. 
   
   
       6 . The method of  claim 1 , wherein the multi-hole capillary conducting layer is made by the steps of:
 putting a sintered metal powder layer into the third tube;   inserting a center bar into the third tube from the first open end and the center bar being against the sintered metal powder layer;   infilling a metal powder between the center bar and the third tube;   performing a sintering process for welding the sintered metal powder layer and the metal powder to form the multi-hole capillary conducting layer; and   drawing out the center bar from the third tube.   
   
   
       7 . The method of  claim 1 , wherein the inner wall of the third tube comprises a plurality of fine notches, and the multi-hole capillary conducting layer is made by the steps of:
 putting a metal powder into the third tube;   inserting a center bar into the third tube from the first open end and the center bar being against the metal powder;   performing a sintering process for welding the metal powder and the plurality of fine notches to form the multi-hole capillary conducting layer; and   drawing out the center bar from the third tube.   
   
   
       8 . The method of  claim 6 , wherein the metal powder is a copper powder, a nickel powder, a silver powder, a copper-plated powder, a nickel-plated powder, or a silver-plated powder. 
   
   
       9 . The method of  claim 1 , wherein the multi-hole capillary conducting layer is made by the step of:
 making a plurality of fine notches on the inner wall of the third tube via a machining process to form the multi-hole capillary conducting layer.   
   
   
       10 . The method of  claim 1 , wherein the multi-hole capillary conducting layer is made by the steps of:
 sintering a plurality of metal particles upon the inner wall of the third tube; and   setting a metal mesh upon the plurality of metal particles to form the multi-hole capillary conducting layer.   
   
   
       11 . The method of  claim 1 , wherein the multi-hole capillary conducting layer is made by the steps of:
 laying an undulant metal cloth upon the inner wall of the third tube; and   setting a smooth metal mesh cloth layer upon the undulant metal cloth to form the multi-hole capillary conducting layer.   
   
   
       12 . The method of  claim 11 , wherein the undulant metal cloth has undulance in a shape of a triangle, a rectangle, a trapezoid, or a wave. 
   
   
       13 . The method of  claim 1 , wherein in step (c), the second open end and the third open end are sealed by a soldering process, a welding process, a mechanical buckling process, or an agglutinating process. 
   
   
       14 . A heat pipe with a flat end, comprising:
 a first tube having a first end and a second end, wherein the first end is sealed;   a second tube having a third end and the flat end, wherein the third end and the second end are sealed by soldering, welding, mechanical buckling, or agglutinating; and   a multi-hole capillary conducting layer formed on an inner wall of the first tube or an inner wall of the second tube;   
     wherein a sealed space is formed by the first tube and the second tube, and the sealed space contains a working fluid. 
   
   
       15 . The heat pipe of  claim 14 , wherein the second tube is made by a powder metallurgy process, a punching process, an injection molding process, a casting process, or a machining process. 
   
   
       16 . The heat pipe of  claim 14 , wherein the flat end of the second tube is in a flat form or in a concave form. 
   
   
       17 . The heat pipe of  claim 14 , wherein the first tube/the second tube is made of a copper, a nickel, or a silver. 
   
   
       18 . The heat pipe of  claim 14 , wherein the multi-hole capillary conducting layer is made by sintering a copper powder, a nickel powder, a silver powder, a copper-plated powder, a nickel-plated powder, or a silver-plated powder. 
   
   
       19 . The heat pipe of  claim 14 , wherein the multi-hole capillary conducting layer comprises a metal particle layer and a metal mesh, the metal particle layer is sintered upon the inner wall of the first tube and the inner wall of the second tube, and the metal mesh is set upon the metal particle layer. 
   
   
       20 . The heat pipe of  claim 14 , wherein the multi-hole capillary conducting layer comprises an undulant metal cloth and a smooth metal mesh cloth layer, the undulant metal cloth is laid upon the inner wall of the first tube and the inner wall of the second tube, and the smooth metal mesh cloth layer is set upon the undulant metal cloth. 
   
   
       21 . The heat pipe of  claim 14 , wherein the multi-hole capillary conducting layer comprises a plurality of fine notches formed upon the inner wall of the first tube and the inner wall of the second tube via a machining process. 
   
   
       22 . The heat pipe of  claim 14 , wherein the multi-hole capillary conducting layer comprises a plurality of fine notches and a metal sintering layer, the plurality of fine notches are formed upon the inner wall of the first tube and the inner wall of the second tube, and the metal sintering layer is formed upon the inner wall of the second tube and welded with the plurality of fine notches. 
   
   
       23 . The method of  claim 7 , wherein the metal powder is a copper powder, a nickel powder, a silver powder, a copper-plated powder, a nickel-plated powder, or a silver-plated powder.