Flat type heat pipe

Abstract

A flat type heat pipe for mounting a heating power element, which is capable of forming an optionally shaped heat transferring path with high accuracy, which is of a thin type and to which fins are easily attached. The flat type heat pipe includes at least two aluminum plates substantially in parallel with each other and brazed to each other so as to form a heat transferring path therebetween. The flat type heat pipe also includes an operating liquid which fills the heat transferring path. Because the heat transferring path 25 is formed by means of press molding, punching, laser beam machining, or cutting various shapes of heat transferring paths can be formed finely and with high accuracy. The flexible flat type heat pipe can be made thin, which allows for a variety of uses. Grooves and wicks can be disposed in the heat transferring path, thereby improving the heat conductivity. Because the surface is flat, the fins can be easily attached thereto, thereby a satisfactory radiation effect can be obtained.

1 . A flat type heat pipe, which comprises: 
 (a) at least two aluminum plates arranged substantially in parallel with each other and brazed to each other so as to form a heat transferring circuit therebetween; and    (b) an operating liquid filled in said heat transferring circuit.    
     
     
         2 . A flat type heat pipe as claimed in  claim 1 , wherein a corrugated aluminum plate is interposed between said at least two aluminum plates to form said heat transferring path.  
     
     
         3 . A flat type heat pipe as claimed in  claim 2 , wherein said corrugated aluminum plate is an aluminum brazing sheet.  
     
     
         4 . A flat type heat pipe as claimed in  claim 2  wherein through-holes are disposed on side walls of protrusion portions of said corrugated aluminum plate.  
     
     
         5 . A flat type heat pipe as claimed in  claim 1 , wherein a metal tube is brazed for feeding said operating liquid into said heat pipe and into an open end of said heat transferring path, and a predetermined portion of said metal tube is sealed after said operating liquid is filled by one of pressure bonding and welding.  
     
     
         6 . A flat type heat pipe as claimed in  claim 1 , wherein supporting bodies are arranged between said at least two aluminum plates which are substantially in parallel with each other, in such a manner that said at least two aluminum plates are spaced at a predetermined distance.  
     
     
         7 . A flat type heat pipe as claimed in  claim 1 , wherein a predetermined number of protrusion portions are formed on one aluminum plate of said at least two aluminum plates which are substantially in parallel with each other and leading portions of said protrusion portions are joined to the other aluminum plates.  
     
     
         8 . A flat type heat pipe as claimed in  claim 1  wherein grooves are formed on inner surfaces of said heat transferring circuit, and a wick is arranged on said heat transferring circuit.  
     
     
         9 . A flat type heat pipe as claimed in  claim 8 , wherein said wick comprises one of grooves formed on an inner surface of said at least two aluminum plates, and an uneven portion formed by melting and solidifying a brazing filler material forming said inner surface of said at least two aluminum plates.  
     
     
         10 . A flat type heat pipe as claimed in  claim 8 , wherein said wick comprises one of a wave-like plate brazed onto said at least two aluminum plates, a cylindrical wire netting, a plate-like wire netting, and a number of spheres arranged adjacent to each other.  
     
     
         11 . A flat type heat pipe as claimed in  claim 1 , wherein protruding portions are formed on one aluminum plate of said at least two aluminum plates which are substantially in parallel with each other, hole portion are disposed on the other aluminum of said at least two aluminum plates and said aluminum plates are positioned by inserting said protruding portion into said hole portion.  
     
     
         12 . A flat type heat pipe as claimed in  claim 1  wherein fins are brazed onto one of a part of said surface of said at least two aluminum plates and the whole of said surface of said at least two aluminum plates.