Heat exchanger

Abstract

A heat exchanger includes fins each housed in a respective one of tubes. Each of the fins includes a connecting portion that corrugated for a predetermined fin pitch and that has peaks joined to an inner surface of a wall of each of the tubes and a non-connecting portion that is not joined to the inner surface of the wall of the each of the tubes. The non-connecting portion has a length longer than the predetermined fin pitch. The wall of the each of the tubes has a protrusion to face the non-connecting portion.

What is claimed is: 
     
         1 . A heat exchanger comprising:
 a plurality of tubes stacked with each other, a heat exchange being performed between a first fluid flowing through the plurality of tubes and a second fluid flowing around the plurality of tubes; and   a plurality of fins each housed in a respective one of the plurality of tubes, wherein   each of the plurality of fins includes:
 a connecting portion that is corrugated for a predetermined fin pitch and that has peaks joined to an inner surface of a wall of each of the plurality of tubes; and 
 a non-connecting portion that is not corrugated for the predetermined fin pitch and that is not joined to the inner surface of the wall of the each of the plurality of tubes, the non-connecting portion having a length longer than the predetermined fin pitch, wherein 
   the wall of the each of the plurality of tubes has a protrusion to face the non-connecting portion.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein
 the protrusion protrudes inward from the wall of the each of the plurality of tubes.   
     
     
         3 . The heat exchanger according to  claim 1 , wherein
 the protrusion is not in contact with the each of the plurality of fins.   
     
     
         4 . The heat exchanger according to  claim 1 , wherein
 the protrusion protrudes outward from the wall of the each of the plurality of tubes.   
     
     
         5 . A heat exchanger comprising:
 a plurality of tubes stacked with each other, a heat exchange being performed between a first fluid flowing through the plurality of tubes and a second fluid flowing around the plurality of tubes; and   a plurality of fins each housed in a respective one of the plurality of tubes, wherein each of the plurality of fins includes:
 a connecting portion that is corrugated for a predetermined fin pitch and that has peaks joined to an inner surface of each of the plurality of tubes; and 
 a non-connecting portion that is not corrugated for the predetermined fin pitch and that is not joined to the inner surface of the each of the plurality of tubes, the non-connecting portion having a length longer than the predetermined fin pitch, wherein 
   the non-connecting portion includes a protrusion.   
     
     
         6 . The heat exchanger according to  claim 5 , wherein
 the protrusion is formed by cutting and bending a portion of the non-connecting portion.   
     
     
         7 . The heat exchanger according to  claim 5 , wherein
 the protrusion is not in contact with the inner surface of the each of the plurality of tubes.   
     
     
         8 . The heat exchanger according to  claim 1 , wherein
 the non-connecting portion extends parallel to the inner surface of the each of the plurality of tubes.   
     
     
         9 . A heat exchanger comprising:
 a plurality of tubes stacked with each other, a heat exchange being performed between a first fluid flowing through the plurality of tubes and a second fluid flowing around the plurality of tubes; and   a plurality of fins each housed in a respective one of the plurality of tubes, wherein   each of the plurality of fins includes:
 a connecting portion that is corrugated for a predetermined fin pitch and that has peaks joined to an inner surface of a wall of each of the plurality of tubes; and 
 a non-connecting portion that is not corrugated for the predetermined fin pitch and that is not joined to the inner surface of the wall of the each of the plurality of tubes, the non-connecting portion having a length longer than the predetermined fin pitch, wherein 
   the wall of the each of the plurality of tubes includes a protrusion to face the non-connecting portion, and   the non-connecting portion includes a protrusion.   
     
     
         10 . A heat exchanger comprising:
 a plurality of tubes stacked with each other, a heat exchange being performed between a first fluid flowing through the plurality of tubes and a second fluid flowing around the plurality of tubes; and   a plurality of fins each housed in a respective one of the plurality of tubes, wherein each of the plurality of fins includes:
 a connecting portion that is corrugated for a predetermined fin pitch and that has peaks joined to an inner surface of a wall of each of the plurality of tubes; and 
 a non-connecting portion that is not joined to the inner surface of the wall of the each of the plurality of tubes, the non-connecting portion having a length longer than the predetermined fin pitch, wherein 
   the wall of the each of the plurality of tubes includes a protrusion to face the non-connecting portion, and   the protrusion protrudes inward from the wall of the each of the plurality of tubes.