Heat exchange element

Abstract

A heat exchange element is a heat exchange element formed by stacking a plurality of heat transfer plates. The heat transfer plate includes: a heat exchanger that allows air passing through one side in a stacking direction of a plurality of the heat transfer plates and air passing through another side in the stacking direction to pass through in directions facing to each other to cause heat exchange; a header provided on one side and another side with the heat exchanger interposed therebetween when viewed along the stacking direction; and a joining edge provided along a side of the heat exchanger not in contact with the header. Joining edges of a plurality of the stacked heat transfer plates are in contact with each other and joined by ultrasonic welding, and the joining edge is formed with a first convex portion that protrudes along the stacking direction.

1 . A heat exchange element formed by stacking a plurality of heat transfer plates, wherein
 each of the heat transfer plates includes:
 a heat exchanger adapted to allow air passing through one side in a stacking direction of a plurality of the heat transfer plates and air passing through another side in the stacking direction to pass through in directions facing each other to cause heat exchange; 
 a header provided on one side and another side with the heat exchanger interposed therebetween when viewed along the stacking direction; and 
 a joining edge provided along a side of the heat exchanger that is not in contact with the header, wherein 
   the joining edge of a plurality of the stacked heat transfer plates are in contact with each other and joined by ultrasonic welding, and   the joining edge is formed with a first convex portion that protrudes along the stacking direction and a concave portion into which the first convex portion of an adjacent heat transfer plate among the heat transfer plates is fitted.   
     
     
         2 . The heat exchange element according to  claim 1 , wherein
 the header is formed with a base protruding along the stacking direction and having a recess formed at a top portion thereof, and a second convex portion to fit into the recess of an adjacent heat transfer plate among the heat transfer plates.   
     
     
         3 . The heat exchange element according to  claim 2 , wherein
 a flat region is provided at a top portion of the base, and the flat region abuts on an adjacent heat transfer plate among the heat transfer plates.   
     
     
         4 . The heat exchange element according to  claim 2 , wherein
 each of the heat transfer plates has a hexagonal shape as viewed along the stacking direction,   the first convex portion and the base are provided along any side of the hexagonal shape, and   a plurality of the first convex portions and a plurality of the bases are formed for a side along which the first convex portions and the bases are formed.   
     
     
         5 . The heat exchange element according to  claim 4 , wherein
 a plurality of the first convex portions and a plurality of the bases are provided at positions where a length of a side along which the first convex portions and the base are formed is divided at equal intervals.   
     
     
         6 . The heat exchange element according to  claim 2 , wherein
 the base has a rhombus shape when viewed along the stacking direction, and is formed such that a longer diagonal line among two diagonal lines is formed along a flow direction of air passing through the header.   
     
     
         7 . The heat exchange element according to  claim 1 , wherein
 a ratio of a height of the first convex portion to a diameter at a root of the first convex portion is 1 or less.