Thinned flat plate heat pipe fabricated by extrusion

Abstract

Disclosed is a thinned flat plate heat pipe fabricated by extrusion and provides a thinned flat plate heat pipe including: a body part having a flat plate shape; a through-hole formed in the longitudinal direction of the body part; and one or more grooves formed on at least one side of an inner wall of the through-hole and allowing a working fluid to flow. According to exemplary embodiments of the present disclosure, a relative wide steam flowing space can be ensured and an interface friction flowing resistance between gas and liquid can be further reduced through portions without the groove and the thickness of the thinned flat plate heat pipe can be maximally reduced, a thin-film type cooling element having a simple structure and a low manufacturing cost can be fabricated.

1 . A thinned flat plate heat pipe, comprising:
 a body part having a flat plate shape;   a through-hole formed in the longitudinal direction of the body part; and   one or more grooves formed on at least one side of inner wall of the through-hole and allowing a working fluid to flow.   
     
     
         2 . The thinned flat plate heat pipe of  claim 1 , wherein an inside of the through-hole is maintained in a vacuum state. 
     
     
         3 . The thinned flat plate heat pipe of  claim 1 , wherein the groove is formed on the inner wall of the through hole by intaglio or embossing. 
     
     
         4 . The thinned flat plate heat pipe of  claim 1 , wherein the groove is a concave space formed between one or more convex portions formed on the inner wall of the through-hole. 
     
     
         5 . The thinned flat plate heat pipe of  claim 1 , wherein a cross section of the groove has a polygonal structure having edges to generate capillary force in the working fluid. 
     
     
         6 . The thinned flat plate heat pipe of  claim 5 , wherein the polygonal structure includes triangular, spire, rectangular and trapezoidal shapes. 
     
     
         7 . The thinned flat plate heat pipe of  claim 1 , wherein the through-hole is separated into a plurality of through-holes by one or more separation membranes. 
     
     
         8 . The thinned flat plate heat pipe of  claim 7 , wherein all of the grooves formed in each through-hole divided by the separation membranes are formed only in the same direction at the inner wall side of each through-hole. 
     
     
         9 . The thinned flat plate heat pipe of  claim 7 , wherein the groove is the concave space formed between the convex portion formed on the inner wall of the through-hole and the separation membrane. 
     
     
         10 . The thinned flat plate heat pipe of  claim 1 , wherein a bundle of wires is formed in the groove. 
     
     
         11 . A method for fabricating a thinned flat plate heat pipe, comprising:
 forming a body part having a flat plate shape by using an extrusion process;   forming a through-hole in the longitudinal direction of the body part; and   forming one or more grooves on at least one side of an inner wall of the through-hole to allow a working fluid to flow   
     
     
         12 . The method of  claim 11 , further comprising forming one or more separation membranes for separating the through-hole into a plurality of through-holes. 
     
     
         13 . The method of  claim 11 , further comprising forming a bundle of wires in the groove. 
     
     
         14 . The method of  claim 11 , wherein the forming of the one or more grooves includes forming one or more convex portions on the inner wall of the through-hole.