Fin heat exchanger comprising improved louvres

Abstract

The connecting edge (18) of the blade (14) of at least the first louver (12) in the row (10) forms an upstream edge with respect to the air flow, the free edge (16) of the blade (14) forming the downstream edge.

1 . A heat exchanger comprising:
 at least one row of tubes;   at least one fin disposed transversely to said row of tubes, the tubes being connected to the fin by clamping the tubes in a collar formed in the fin; and   at least one row of louvers, said row being formed in the fin and interposed between two tubes in the row of tubes, each louver comprising a blade provided with a free edge and a connecting edge connecting the louver to the fin,   wherein the connecting edge of the blade of at least the first louver in the row forms an upstream edge with respect to the air flow, the free edge of the blade forming the downstream edge.   
     
     
         2 . The heat exchanger as claimed in  claim 1 , wherein the heat exchanger has only one row of tubes, and wherein the connecting edges of all the blades in the row form an upstream edge with respect to the air flow, the free edge of the blades forming the downstream edge. 
     
     
         3 . The heat exchanger as claimed in  claim 1 , wherein the free edge of at least the last blade in the row forms an upstream edge with respect to the air flow, the connecting edge of this last blade forming the downstream edge. 
     
     
         4 . The heat exchanger as claimed in  claim 3 , wherein the row of louvers comprises two groups of louvers, the louvers of the second group following the louvers of the first group in the row of louvers, the connecting edge of the blades of the first group forming the upstream edge with respect to the air flow, the free edge of the blades of the first group forming the downstream edge, and the free edge of the blades of the second group forming the upstream edge with respect to the air flow, the connecting edge of the blades of the second group forming the downstream edge. 
     
     
         5 . The heat exchanger as claimed in  claim 4 , wherein the two groups of louvers comprise equal numbers of louvers. 
     
     
         6 . The heat exchanger as claimed in  claim 4 , wherein the free edge of the blade of the last louver of the first group is connected to the free edge of the blade of the first louver of the second group by a joining blade that forms a bridge substantially parallel to the surface of the fin. 
     
     
         7 . The heat exchanger as claimed in  claim 6 , wherein the dimension of the joining blade between the free edge of the blade of the last louver of the first group and the free edge of the blade of the first louver of the second group is less than 3 mm.