Heat exchanger

Abstract

A heat exchanger, includes: a header that extends in a header extension direction and through which refrigerant flows inside; and multi-hole heat transfer tubes inserted into the header in a heat transfer tube insertion direction intersecting the header extension direction. Each of the multi-hole heat transfer tubes: has a flat shape in which a width in a heat transfer tube width direction intersecting the header extension direction is greater than a height in the header extension direction at a portion inserted into the header, and includes holes communicating with an inside of the header.

What is claimed is: 
     
         1 . A heat exchanger, comprising:
 a header that extends in a header extension direction and through which refrigerant flows inside; and   multi-hole heat transfer tubes inserted into the header in a heat transfer tube insertion direction intersecting the header extension direction, wherein   each of the multi-hole heat transfer tubes:
 has a flat shape in which a width in a heat transfer tube width direction intersecting the header extension direction is greater than a height in the header extension direction at a portion inserted into the header, and 
 includes holes communicating with an inside of the header, 
   the header comprises:
 a first member that includes a first opening extending in the header extension direction and that has an Ω-shaped cross section perpendicular to the header extension direction; 
 a second member that includes second openings each having a width greater than a width of the first opening in the heat transfer tube width direction; and 
 a third member that includes third openings each having a width greater than the width of the second openings in the heat transfer tube width direction and communicating with the multi-hole heat transfer tubes, and with which the multi-hole heat transfer tubes are in contact, 
   the second member is disposed between the first member and the third member,   each of the second openings overlaps a respective one of the third openings within a range of the width of each of the third openings in the heat transfer tube width direction, and   the first opening overlaps each of the second openings within a range of the width of each of the second openings in the heat transfer tube width direction.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein the first member is extruded to have the Ω-shaped cross section. 
     
     
         3 . The heat exchanger according to  claim 1 , wherein the first member comprises a flat plate portion having a flat plate-shape in which a thickness is greater than a length of the first opening in the heat transfer tube insertion direction. 
     
     
         4 . The heat exchanger according to  claim 1 , wherein the first member and the multi-hole heat transfer tubes are made of aluminum or an aluminum alloy. 
     
     
         5 . The heat exchanger according to  claim 1 , wherein the refrigerant is a carbon dioxide refrigerant. 
     
     
         6 . The heat exchanger according to  claim 1 , further comprising:
 a fourth member joined to the third member and that includes fourth openings through which the multi-hole heat transfer tubes pass; and   a fifth member that includes fifth openings through which the multi-hole heat transfer tubes fit and penetrate and that is joined to side surfaces of the first member, the second member, and the third member, and to the fourth member.   
     
     
         7 . The heat exchanger according to  claim 1 , wherein the width of each of the second openings in the heat transfer tube width direction is greater than twice the width of the first opening in the heat transfer tube width direction. 
     
     
         8 . The heat exchanger according to  claim 1 , wherein the width of each of the third openings in the heat transfer tube width direction is greater than twice the width of each of the second openings in the heat transfer tube width direction.