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 has a through hole. The heat transfer tube is inserted into the through hole. Each fin includes a planar portion, and a first protruding portion and a second protruding portion protruding from the planar portion. The first protruding portion is curved along the longitudinal direction. The second protruding portion has an extending portion extending in the longitudinal direction. The extending portion is located to overlap a center of the through hole 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 through hole,   the heat transfer tube being inserted into 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,   the second protruding portion surrounding the through hole and having an extending portion extending in the longitudinal direction,   the extending portion being located to overlap a center of the through hole in the widthwise direction.   
     
     
         2 . 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 into 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,   the second protruding portion having an extending portion extending in the longitudinal direction,   the extending portion being located to overlap a center of the through hole in the widthwise direction, and   the second protruding portion being located between the first protruding portion and the through hole and surrounding the through hole.   
     
     
         3 . The heat exchanger according to  claim 1 , wherein the second protruding portion extends linearly in the longitudinal direction. 
     
     
         4 . The heat exchanger according to  claim 3 , wherein the second protruding portion protrudes from the planar portion opposite to the first protruding portion. 
     
     
         5 . 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 into 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,   the second protruding portion having an extending portion extending in the longitudinal direction,   the extending portion being located to overlap a center of the through hole in the widthwise direction,   the second protruding portion extending linearly in the longitudinal direction, and   the second protruding portion being located to be displaced from the first protruding portion in the widthwise direction.   
     
     
         6 . 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 into 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,   the second protruding portion having an extending portion extending in the longitudinal direction,   the extending portion being located to overlap a center of the through hole in the widthwise direction,   the fin comprising
 a first region without the through hole in the widthwise direction, and 
 a second region with the through hole in the widthwise direction, 
   in the first region, a first area of the first protruding portion and the second protruding portion extending in the widthwise direction being larger than a second area of the first protruding portion and the second protruding portion extending in the longitudinal direction, and   in the second region, the first area being smaller than the second area.   
     
     
         7 . 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.