Corrugated fin and heat exchanger including the same

Abstract

A corrugated fin has flat plate sections each having a pair of lateral sides facing each other and a pair of end sides facing each other, and joining sections connecting with lateral sides of the flat plate sections. The flat plate sections and joining sections are alternately formed into a corrugated shape by bending. The joining section has an even surface joined to a tube through which a heat exchange medium flows, while the flat plate section includes a recess or protrusions in arbitrary sections taken along two directions including a direction in which the lateral sides are arranged and a direction in which the end sides are arranged, respectively.

1 . A corrugated fin for a heat exchanger, comprising:
 a flat plate section and a joining section which are alternately formed into a corrugated shape by bending, said flat plate section having a pair of lateral sides facing each other and a pair of end sides facing each other, said joining section connecting with a lateral side of the pair of lateral sides of the flat plate section,   wherein said joining section has an even surface joined to a tube through which a heat exchange medium is circulated, and   wherein said flat plate section has at least one recess or protrusion in an arbitrary section taken in two directions, one of the two directions being a direction in which the pair of lateral sides are arranged, and the other of the two directions being a direction in which the pair of end sides are arranged.   
     
     
         2 . The corrugated fin of  claim 1 , wherein the even surface of the joining section is formed into a plane surface. 
     
     
         3 . The corrugated fin of  claim 1 , wherein the even surface of the joining section is formed into a curved surface. 
     
     
         4 . The corrugated fin of  claim 1 , wherein two or more recesses or protrusions are provided. 
     
     
         5 . A heat exchanger including the corrugated fin of  claim 1 . 
     
     
         6 . The corrugated fin of  claim 2 , wherein two or more recesses or protrusions are provided. 
     
     
         7 . The corrugated fin of  claim 3 , wherein two or more recesses or protrusions are provided. 
     
     
         8 . A heat exchanger including the corrugated fin of  claim 2 . 
     
     
         9 . A heat exchanger including the corrugated fin of  claim 3 . 
     
     
         10 . A heat exchanger including the corrugated fin of  claim 4 . 
     
     
         11 . A heat exchanger including the corrugated fin of  claim 6 . 
     
     
         12 . A heat exchanger including the corrugated fin of claim.  7 .