Heat exchanger

Abstract

A heat exchanger includes: flat tubes disposed in a first direction; and a fin joined to the flat tubes. The heat exchanger causes heat exchange between: a refrigerant that flows inside the flat tubes, and air that flows outside the flat tubes along a second direction that intersects the first direction. The fin includes: a first joint portion joined to a first flat tube included in the flat tubes; and a first plate portion between an air flow downstream end of the fin and the first joint portion. The first plate portion includes a protruding portion that causes water to flow in the first direction in a vicinity of the first flat tube.

What is claimed is: 
     
         1 . A heat exchanger comprising:
 flat tubes disposed in a first direction; and   a fin joined to the flat tubes, wherein   the heat exchanger causes heat exchange between:
 a refrigerant that flows inside the flat tubes, and 
 air that flows outside the flat tubes along a second direction that intersects the first direction, 
   the fin comprises:
 a first joint portion joined to a first flat tube included in the flat tubes; and 
 a first plate portion between an air flow downstream end of the fin and the first joint portion, and 
   the first plate portion comprises a protruding portion that causes water to flow in the first direction in a vicinity of the first flat tube.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein the protruding portion extends in the first direction. 
     
     
         3 . The heat exchanger according to  claim 1 , wherein a distance in the second direction between an air flow downstream end of the first flat tube and the protruding portion is less than a distance in the second direction between the air flow downstream end of the fin and the protruding portion. 
     
     
         4 . The heat exchanger according to  claim 1 , wherein
 the fin further comprises:
 a second joint portion joined to a second flat tube included in the flat tubes and adjacent to the first flat tube in the first direction; and 
 a second plate portion between the first joint portion and the second joint portion, and 
   the second plate portion comprises a protruding portion extending in a direction inclined with respect to both the first direction and the second direction.   
     
     
         5 . The heat exchanger according to  claim 4 , wherein
 the protruding portion of the first plate portion extends in an up-down direction, and   the protruding portion of the second plate portion extends obliquely downward from a vicinity of an air flow downstream portion of the first flat tube.   
     
     
         6 . The heat exchanger according to  claim 4 , wherein
 the protruding portion of the first plate portion extends in an up-down direction, and   the protruding portion of the second plate portion extends obliquely downward from a vicinity of an air flow upstream portion of the first flat tube.   
     
     
         7 . The heat exchanger according to  claim 1 , wherein
 the fin further comprises:
 a second joint portion joined to a second flat tube included in the flat tubes and adjacent to the first flat tube in the first direction; 
 a second plate portion between the first joint portion and the second joint portion; and 
 a third plate portion between the air flow downstream end of the fin and the second plate portion, and 
   the third plate portion comprises a protruding portion that is continuous with the protruding portion of the first plate portion.   
     
     
         8 . The heat exchanger according to  claim 1 , wherein
 the fin further comprises:
 a second joint portion joined to a second flat tube included in the flat tubes and adjacent to the first flat tube in the first direction; and 
 a second plate portion between the first joint portion and the second joint portion, and 
   the second plate portion comprises a notch that enhances heat transfer.   
     
     
         9 . The heat exchanger according to  claim 1 , further comprising:
 fins disposed in an extending direction of the flat tubes, wherein   a fin pitch of the fins is greater than or equal to 1.2 mm and less than or equal to 1.4 mm, and   a height of the protruding portion of the first plate portion is greater than or equal to 0.1 mm and less than or equal to 0.6 mm.   
     
     
         10 . The heat exchanger according to  claim 1 , wherein the heat exchanger is included in an indoor unit of an air-conditioning apparatus.