Heat exchanger and refrigeration cycle apparatus

Abstract

A heat exchanger includes: a fin extending in a widthwise direction along an air flow direction and extending in a longitudinal direction crossing the air flow direction; and a heat transfer tube passing through the fin. The fin includes a planar portion, and a plurality of first protruding portions and a plurality of second protruding portions that protrude from the planar portion. The plurality of first protruding portions include a first projection curved downward in the longitudinal direction, and a second projection curved upward in the longitudinal direction. Each of the plurality of second protruding portions surrounds a corresponding one of the plurality of through holes. A vertex of the first projection and a vertex of the second projection are located at the same position in the widthwise direction.

1 . A heat exchanger comprising:
 a fin extending in a widthwise direction along an air flow direction and extending in a longitudinal direction crossing the air flow direction; and   a heat transfer tube passing through the fin,   the fin having a plurality of through holes arranged in the longitudinal direction,   the heat transfer tube being inserted in the plurality of through holes,   the fin comprising a planar portion, and a plurality of first protruding portions and a plurality of second protruding portions that protrude from the planar portion,   the plurality of first protruding portions comprising
 a first projection located between corresponding through holes of the plurality of through holes and curved downward in the longitudinal direction, and 
 a second projection located between corresponding through holes of the plurality of through holes and curved upward in the longitudinal direction, 
   each of the plurality of second protruding portions being located between a corresponding one of the plurality of first protruding portions and a corresponding one of the plurality of through holes, and surrounding the corresponding through hole, and   a vertex of the first projection and a vertex of the second projection being located at the same position in the widthwise direction.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein
 the first protruding portion is narrower in width than the second protruding portion.   
     
     
         3 . The heat exchanger according to  claim 1 , wherein
 at least one of the first protruding portion and the second protruding portion includes an inner inclined surface located to face a corresponding one of the plurality of through holes, and an outer inclined surface located opposite to the corresponding one of the plurality of through holes with respect to the inner inclined surface, and   an inner inclination angle formed by the inner inclined surface with respect to the planar portion is smaller than an outer inclination angle formed by the outer inclined surface with respect to the planar portion.   
     
     
         4 . The heat exchanger according to  claim 3 , wherein
 at least one of the first protruding portion and the second protruding portion is inclined such that a protruding height from the planar portion becomes lower toward a center of the at least one of the first protruding portion and the second protruding portion in the widthwise direction.   
     
     
         5 . The heat exchanger according to  claim 1 , wherein
 the fin includes an intermediate protruding portion protruding from the planar portion, and   the intermediate protruding portion extends linearly in the longitudinal direction and connects the vertex of the first projection and the vertex of the second projection.   
     
     
         6 . The heat exchanger according to  claim 1 , wherein
 the fin includes a third protruding portion protruding from the planar portion, and   the third protruding portion extends linearly in the longitudinal direction.   
     
     
         7 . The heat exchanger according to  claim 6 , wherein
 the third protruding portion is located outside the first protruding portion in the widthwise direction and is narrower in width than the first protruding portion and the second protruding portion.   
     
     
         8 . The heat exchanger according to  claim 6 , wherein
 the first projection is located at a position that is more distant from the third protruding portion than the second projection in the widthwise direction.   
     
     
         9 . A refrigeration cycle apparatus comprising:
 the heat exchanger according to  claim 1 ; and   a refrigerant circulation device,   the refrigerant circulation device being configured to circulate refrigerant for performing heat exchange with air in the heat exchanger.   
     
     
         10 . A heat exchanger comprising:
 a fin extending in a widthwise direction and extending in a longitudinal direction crossing the widthwise direction; and   a heat transfer tube passing through the fin,   the fin having a plurality of through holes arranged in the longitudinal direction,   the heat transfer tube being inserted in the plurality of through holes,   the fin comprising a planar portion, and a plurality of first protruding portions and a plurality of second protruding portions that protrude from the planar portion,   the plurality of first protruding portions comprising
 a first projection located between corresponding through holes of the plurality of through holes and curved downward in the longitudinal direction, and 
 a second projection located between corresponding through holes of the plurality of through holes and curved upward in the longitudinal direction, and 
   each of the plurality of second protruding portions being located between a corresponding one of the plurality of first protruding portions and a corresponding one of the plurality of through holes.   
     
     
         11 . The heat exchanger according to  claim 10 , wherein each of the plurality of second protruding portions surrounds the corresponding through hole. 
     
     
         12 . The heat exchanger according to  claim 10 , wherein a vertex of the first projection and a vertex of the second projection are located at the same position in the widthwise direction.