Heat exchanger

Abstract

A heat exchanger includes a heat transfer tube extending in a first direction, and a plurality of fins stacked in the first direction. Each fin includes a body portion extending in a second direction, and a collar portion. The collar portion has a first portion extending from the body portion in the first direction, a second portion extending from the first portion toward the heat transfer tube, and a third portion extending in the first direction from the second portion. The second portion of a first fin contacts a distal end portion of the collar portion of a second fin adjacent to the first fin. The second portion has a portion where a first distance between inner and outer peripheral surfaces is a first dimension, and a portion where a second distance between the inner and outer peripheral surfaces is a second dimension greater than the first dimension.

1 . A heat exchanger comprising:
 a heat transfer tube extending in a first direction; and   a plurality of fins stacked in the first direction, each of the plurality of fins including
 a body portion extending in a second direction that intersects the first direction, and 
 a collar portion that allows the heat transfer tube to pass therethrough, the collar portion having
 a first portion extending from the body portion in the first direction, 
 a second portion extending from the first portion toward the heat transfer tube, and 
 a third portion extending in the first direction from the second portion along the heat transfer tube, 
 
   the second portion of a first fin of the plurality of fins being in contact with a distal end portion of the collar portion of a second fin of the plurality of fins disposed adjacent to the first fin, and the second portion having, when viewed from the first direction,
 a portion where a first distance between an inner peripheral surface and an outer peripheral surface is a first dimension, and 
 a portion where a second distance between the inner peripheral surface and the outer peripheral surface is a second dimension greater than the first dimension. 
   
     
     
         2 . The heat exchanger according to  claim 1 , wherein
 the collar portion has a fourth portion extending radially outward from the third portion, and   the second portion of the first fin is in contact with the fourth portion of the second fin disposed adjacent to the first fin.   
     
     
         3 . The heat exchanger according to  claim 1 , wherein
 the second dimension is a portion extending along the second direction.   
     
     
         4 . The heat exchanger according to  claim 1 , wherein
 the second portion has, when viewed from the first direction,
 an annular portion having an annular shape, and 
 a triangular portion that is continuous with a part of the annular portion and has a triangular shape, and 
 the triangular portion configures in the portion having the second dimension. 
   
     
     
         5 . The heat exchanger according to  claim 4 , wherein
 the triangular portion is disposed at a lower end portion of the second portion.   
     
     
         6 . The heat exchanger according to  claim 1 , wherein
 each fin is provided with a drain rib, and   the drain rib extends from a convex space formed by the first portion and the second portion of the first fin and a distal end of the collar portion of the second fin.   
     
     
         7 . The heat exchanger according to  claim 6 , wherein
 the drain rib is connected to the portion having the second dimension.   
     
     
         8 . The heat exchanger according to  claim 6 , wherein
 the drain rib is provided on the body portion, and   the drain rib protrudes in the first direction to the second portion.   
     
     
         9 . The heat exchanger according to  claim 6 , wherein
 each fin includes a plurality of the collar portions, and the drain rib extends in the second direction from a first collar portion of the plurality of collar portions to a collar portion disposed below the first collar portion.   
     
     
         10 . The heat exchanger according to  claim 1 , wherein
 the heat exchanger is included in an indoor unit of an air-conditioning apparatus.   
     
     
         11 . The heat exchanger according to  claim 2 , wherein
 the second dimension is a portion extending along the second direction.   
     
     
         12 . The heat exchanger according to  claim 2 , wherein
 the second portion has, when viewed from the first direction,
 an annular portion having an annular shape, and 
 a triangular portion that is continuous with a part of the annular portion and has a triangular shape, and 
 the triangular portion configures in the portion having the second dimension. 
   
     
     
         13 . The heat exchanger according to  claim 2 , wherein
 each fin is provided with a drain rib, and   the drain rib extends from a convex space formed by the first portion and the second portion of the first fin and a distal end of the collar portion of the second fin.   
     
     
         14 . The heat exchanger according to  claim 3 , wherein
 the second portion has, when viewed from the first direction,
 an annular portion having an annular shape, and 
 a triangular portion that is continuous with a part of the annular portion and has a triangular shape, and 
 the triangular portion configures in the portion having the second dimension. 
   
     
     
         15 . The heat exchanger according to  claim 3 , wherein
 each fin is provided with a drain rib, and   the drain rib extends from a convex space formed by the first portion and the second portion of the first fin and a distal end of the collar portion of the second fin.   
     
     
         16 . The heat exchanger according to  claim 4 , wherein
 each fin is provided with a drain rib, and   the drain rib extends from a convex space formed by the first portion and the second portion of the first fin and a distal end of the collar portion of the second fin.   
     
     
         17 . The heat exchanger according to  claim 7 , wherein
 the drain rib is provided on the body portion, and   the drain rib protrudes in the first direction to the second portion.   
     
     
         18 . The heat exchanger according to  claim 7 , wherein
 each fin includes a plurality of the collar portions, and the drain rib extends in the second direction from a first collar portion of the plurality of collar portions to a collar portion disposed below the first collar portion.   
     
     
         19 . The heat exchanger according to  claim 8 , wherein
 each fin includes a plurality of the collar portions, and the drain rib extends in the second direction from a first collar portion of the plurality of collar portions to a collar portion disposed below the first collar portion.