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 tubepassing through the fin. The fin has a through hole. The fin includes a planar portion, and a first protruding portion, a second protruding portion and a third protruding portion protruding from the planar portion. The first protruding portion is curved along the longitudinal direction. The second protruding portion is located between the first protruding portion and the through hole and surrounds the through hole. The third protruding portion extends linearly in the longitudinal direction and is located on a leeward side relative to the first protruding portion and the second protruding portion in the air flow 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 through hole,   the heat transfer tube being inserted in the through hole,   the fin comprising
 a planar portion, and 
 a first protruding portion, a second protruding portion and a third protruding portion protruding from the planar portion, 
   the first protruding portion being curved along the longitudinal direction,   the second protruding portion being located between the first protruding portion and the through hole and surrounding the through hole, and   the third protruding portion extending linearly in the longitudinal direction and being located on a leeward side relative to the first protruding portion and the second protruding portion in the air flow direction.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein
 the fin comprises a fourth protruding portion protruding from the planar portion, and   the fourth protruding portion extends linearly in the longitudinal direction, is located on a windward side relative to the first protruding portion and the second protruding portion in the air flow direction, and protrudes from the planar portion less than the third protruding portion.   
     
     
         3 . The heat exchanger according to  claim 2 , wherein
 the fourth protruding portion protrudes from the planar portion less than the second protruding portion, and   the second protruding portion protrudes from the planar portion less than the third protruding portion.   
     
     
         4 . The heat exchanger according to  claim 2 , wherein
 the fourth protruding portion is located to be displaced from the first protruding portion and the second protruding portion in the widthwise direction.   
     
     
         5 . The heat exchanger according to  claim 1 , wherein
 the first protruding portion is longer on its leeward side than on its windward side with respect to a center of the through hole in the widthwise direction.   
     
     
         6 . 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.   
     
     
         7 . 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 through hole,   the heat transfer tube being inserted in the through hole,   the fin comprising
 a planar portion, and 
 a first protruding portion and a second protruding portion protruding from the planar portion, 
   the first protruding portion being curved along the longitudinal direction, and   the second protruding portion being located between the first protruding portion and the through hole and surrounding the through hole.