Heat exchanger and refrigeration cycle apparatus including the same

Abstract

A flat heat transfer tube in an outdoor heat exchanger includes a main body and a connecting portion. The flat heat transfer tube has a plurality of flow paths spaced from each other. The flat heat transfer tube has a first side portion and a second side portion spaced from each other by a width. The connecting portion connected to an opening of a header has an opening end face in which each of the flow paths opens. In the connecting portion, the first side portion is tapered toward the opening end face to be reduced in width. A first opening end of a first flow path located closest to the first side portion has a second flow path cross-sectional area smaller than a first flow path cross-sectional area of an opening end of each of other flow paths.

1 . A heat exchanger comprising:
 a flat heat transfer tube
 having a flat shape, 
 having a first side portion and a second side portion spaced from each other by a width in a first direction, 
 extending in a second direction crossing the first direction, and 
 having a plurality of flow paths each extending in the second direction, the flow paths being spaced from each other in the first direction; 
   a header having an opening to which the flat heat transfer tube is connected; and   a heat dissipation fin, wherein   the flat heat transfer tube comprises
 a main body attached to the heat dissipation fin, and 
 a connecting portion having an opening end face at which each of the flow paths opens, the connecting portion being inserted into the opening of the header and connected to the header, 
   in the main body, each of the flow paths has a first flow path cross-sectional area,   in the connecting portion, only the first side portion is tapered toward the opening end face to be reduced in the width, and   in the opening end face, a first opening end of a first flow path located closest to the tapered first side portion among the flow paths has a second flow path cross-sectional area smaller than the first flow path cross-sectional area.   
     
     
         2 . (canceled) 
     
     
         3 . The heat exchanger according to  claim 1 , wherein the tapered first side portion is in contact with an opening inner wall surface in the opening of the header. 
     
     
         4 . (canceled) 
     
     
         5 . The heat exchanger according to  claim 1 , wherein the opening end face is located to extend in the first direction. 
     
     
         6 . The heat exchanger according to  claim 1 , wherein the opening end face is located to extend from the first side portion to the second side portion to extend toward the main body in a third direction crossing the first direction. 
     
     
         7 . The heat exchanger according to  claim 1 , wherein the flat heat transfer tube is disposed such that the first side portion is located on a leeward side and the second side portion is located on a windward side. 
     
     
         8 . A refrigeration cycle apparatus comprising the heat exchanger according to  claim 1 . 
     
     
         9 . A heat exchanger comprising:
 a flat heat transfer tube
 having a flat shape, 
 having a first side portion and a second side portion spaced from each other by a width in a first direction, 
 extending in a second direction crossing the first direction, and 
 having a plurality of flow paths each extending in the second direction, the flow paths being spaced from each other in the first direction; 
   a header having an opening to which the flat heat transfer tube is connected; and   a heat dissipation fin, wherein   the flat heat transfer tube comprises
 a main body attached to the heat dissipation fin, and 
 a connecting portion having an opening end face at which each of the flow paths opens, the connecting portion being inserted into the opening of the header and connected to the header, 
   in the main body, each of the flow paths has a first flow path cross-sectional area,   in the connecting portion, the first side portion is tapered toward the opening end face to be reduced in the width,   in the opening end face, a first opening end of a first flow path located closest to the tapered first side portion among the flow paths has a second flow path cross-sectional area smaller than the first flow path cross-sectional area,   in the connecting portion, the second side portion is tapered toward the opening end face to be reduced in the width,   in the opening end face, a second opening end of a second flow path located closest to the tapered second side portion among the flow paths arranged in the first direction has a third flow path cross-sectional area smaller than the first flow path cross-sectional area and larger than the second flow path cross-sectional area, and   in the connecting portion, the first side portion is tapered more inward in the width direction of the flat heat transfer tube than the second side portion.   
     
     
         10 . The heat exchanger according to  claim 9 , wherein
 the tapered first side portion is in contact with an opening inner wall surface in the opening of the header, and   the tapered second side portion is in contact with the opening inner wall surface in the opening of the header.   
     
     
         11 . The heat exchanger according to  claim 9 , wherein the opening end face is located to extend in the first direction. 
     
     
         12 . The heat exchanger according to  claim 9 , wherein the opening end face is located to extend from the first side portion to the second side portion to extend toward the main body in a third direction crossing the first direction. 
     
     
         13 . The heat exchanger according to  claim 9 , wherein the flat heat transfer tube is disposed such that the first side portion is located on a leeward side and the second side portion is located on a windward side. 
     
     
         14 . A refrigeration cycle apparatus comprising the heat exchanger according to  claim 9 .