Heat exchanger and heat transferring member with symmetrical angle portions

Abstract

A plurality of angle portions 2 c of the fins on an upstream side and those on a downstream side of an air flow are provided so as to be substantially symmetrical with each other. Due to this, bending forces are continuously exerted on a thin plate-like fin material in a direction where the bending deformation of the fin material is cancelled, during the fin forming process. Accordingly, when the angle portions 2 c are formed it can be prevented in advance that the fin material 11 is deformed in a state where the repeated deformations of the fin material 11 are accumulated in the same direction.

1 . A heat exchanger comprising: 
 tubes in which a fluid flows; and    fins which are provided on outer surfaces of the tubes and increase a heat exchanging area with air flowing around the tubes;    wherein the fin has substantially plate-shaped plane portions and collision walls formed by cutting and raising up parts of the plane portion; and    wherein when a ratio D/C between a length C of the fin orthogonal to the air flow direction and a length D of the collision walls orthogonal to the air flow direction is assumed to be a slit length ratio E, the slit length ratio E is set within a range not less than 0.775 and not larger than 0.995.    
   
   
       2 . A heat exchanger, as set forth in  claim 1 , wherein the slit length ratio E is set within a range of not less than 0.810 and not larger than 0.980.  
   
   
       3 . A heat exchanger, as set forth in  claim 1;   wherein the collision walls and slit pieces of the plane portion continuously connected to the collision walls form L-shaped sections; and    wherein the L-shaped sections on an upstream side of an air flow and the L-shaped sections on a downstream side of the air flow are arranged substantially symmetrically with each other with respect to a virtual plane perpendicular to the plane portions.    
   
   
       4 . A heat exchanger, as set forth in  claim 1 , wherein some of a plurality of the collision walls arranged on the upstream side of the air flow are provided with an angle height H higher than that of the other collision walls and all of a plurality of the collision walls arranged on the downstream side of the air flow are provided with an equal angle height H.  
   
   
       5 . A heat exchanger, as set forth in  claim 1;   wherein the angle height H of some of a plurality of the collision walls arranged on the upstream side of the air flow becomes higher toward a downstream direction of the air flow; and    wherein the angle height h of some of a plurality of the collision walls arranged on the downstream side of the air flow is lower than that h of the collision wall arranged on a most downstream side in a plurality of the collision walls arranged on the upstream side of the air flow.    
   
   
       6 . A heat exchanger, as set forth in  claim 1 , wherein the fins are corrugated fins formed in a wave shape.  
   
   
       7 . A heat exchanger, as set forth in  claim 1 , wherein the fins are plate fins formed in a plane shape.  
   
   
       8 . A heat exchanger, as set forth in  claim 1 , wherein a protrusion protruding to an air flow upstream side from an end position of the tube is formed on the fin and the collision walls are also formed on the protrusion.  
   
   
       9 . A heat exchanger, as set forth in  claim 8 , wherein at least two of the collision walls are also formed on the protrusion.  
   
   
       10 . A heat exchanger, as set forth in  claim 8 , wherein a downstream end in an air flow direction of the fin is arranged not to protrude from a downstream end in the air flow direction of the tube.  
   
   
       11 . A heat transfer member made of a thin plate member, dipped in fluid and thereby supplying or receiving the heat between it and the fluid; 
 wherein it comprises a plane portion having a plurality of heat exchanging portions which comprises angle portions cut and raised up from the thin plate member and slit pieces continuously connected to root portions of the angle portions; and    wherein when the ratio D/C between a length C of a thin plate member orthogonal to the fluid flow direction and a length D of the angle portions orthogonal to the fluid flow direction is assumed to be a slit length ratio E, the slit length ratio E is set within a range not less than 0.775 and not larger than 0.995.    
   
   
       12 . A heat transfer member, as set forth in  claim 11 , wherein the slit length ratio E is set within a range not less than 0.810 and not larger than 0.980.