Heat exchanger

Abstract

The upstream side ends of fins ( 16 ) along the ventilating direction project out relative to the upstream side ends along the ventilating direction of tubes ( 14 ) without being allowed to project out beyond the end faces of tanks ( 2 ) and ( 3 ) along the ventilating direction so as to set the tubes ( 14 ) at positions recessed toward the downstream side along the ventilating direction relative to the fins ( 16 ), and the downstream side ends of the fins ( 16 ) along the ventilating direction are recessed further toward the upstream side along the ventilating direction relative to the downstream side ends of tubes ( 15 ) along the ventilating direction. As a result, the evaporator achieves a lower profile along the ventilating direction and, at the same time, condensed water manifesting at the surfaces of the tubes and fins is drained downward with a high degree of efficiency, thereby minimizing occurrence of spattering of the condensed water onto the downstream side and also, it becomes possible to prevent corrosion from advancing at the tubes due to dirt adhering onto the upstream side of the tubes along the ventilating direction.

1 . A heat extender comprising, at least, tubes each having therein a heat exchanging medium passage, fins laminated alternately between said tubes and a tank provided at ends of said tubes on at least one side, characterized in that: 
 upstream side ends along the ventilating direction of said fins project out further toward the upstream side along the ventilating direction relative to upstream side ends of said tubes along the ventilating direction within a range in which the upstream side ends of said fins do not further beyond an end face of said tank on the upstream side along the ventilating direction; and    downstream side ends of said fins along the ventilating direction are recessed further toward the upstream side along the ventilating direction relative to downstream side ends of said tubes along the ventilating direction.    
     
     
         2 . A heat exchanger comprising, at least, tubes each having therein a heat exchanging medium passage, with a plurality thereof set parallel to one another along the ventilating direction, fins laminated alternately between said tubes with a plurality thereof set parallel to one another along the ventilating direction in a quantity corresponding to the quantity of said tubes and a tank provided at ends of said tubes on one side, characterized in that: 
 an upstream side end along the ventilating direction of a fin set on a side furthest upstream along the ventilating direction project out further toward the upstream side along the ventilating direction relative to an upstream side end along the ventilating direction of a tube set on the side furthest upstream along the ventilating direction within a range in which the upstream side end of said fin along the ventilating direction does not project further beyond an end face of said tank on the upstream side along the ventilating direction; and    a downstream side end along the ventilating direction of a fin set on a side furthest downstream along the ventilating direction is recessed further toward the upstream side along the ventilating direction relative to a downstream side end along the ventilating direction of a tube set on the side furthest downstream along the ventilating direction.    
     
     
         3 . A heat exchanger according to  claim 2 , characterized in that: 
 an upstream side end along the ventilating direction of a fin that is not the fin set on the side furthest upstream along the ventilating direction, too, projects out further toward the upstream side along the ventilating direction relative to an upstream side end along the ventilating direction of a tube facing opposite said fin along the laminating direction within a range in which the upstream side end of said fin does not come into contact with the fin set on the side furthest upstream along the ventilating direction.    
     
     
         4 . A heat exchanger according to  claim 2 , characterized in that: 
 a downstream side end along the ventilating direction of a fin that is not the fin set on the side furthest downstream along the ventilating direction, too, is recessed further toward the upstream side along the ventilating direction relative to the downstream side ends along the ventilating direction of said tubes set in parallel to one another.    
     
     
         5 . A heat exchanger according to  claim 1 ,  2 ,  3  or  4 , characterized in that: 
 the extent by which the upstream side ends of said fins along the ventilating direction project out further toward the upstream side along the ventilating direction is greater than the extent by which the downstream side ends along the ventilating direction of said fins are recessed further toward the upstream side along the ventilating direction.  
 
     
     
         6 . A heat exchanger according to  claim 1 ,  2 ,  3  or  4 , characterized in that: 
 said tubes are each formed by bending a single brazing sheet; and  
 said tubes each include a junction formed by bonding ends of said brazing sheet on the upstream side along the ventilating direction and said junction assumes a structure achieved by tightly winding a portion of said brazing sheet close to one of the ends.