Heat exchanger

Abstract

A heat exchanger has tubes for performing heat exchange between an internal fluid flowing inside of the tubes and an external fluid flowing outside of the tubes and a tank connected to the tubes. Each of the tubes has projections projecting from an outer surface thereof. The projections are arranged in a longitudinal direction of the tube such that grooves are provided between the adjacent projections as external fluid passage portions. The tank has tube insertion portions defining openings into which ends of the tubes are inserted. Each of the tube insertion portions is configured such that a perimeter surface defining the opening thereof entirely covers at least one external fluid passage portion of the tube.

1 . A heat exchanger comprising:
 a plurality of tubes for performing heat exchange between an internal fluid flowing inside of the tubes and an external fluid flowing outside of the tubes, each of the tubes having projections that project from an outer surface thereof, the projections arranged in a longitudinal direction of the tube such that grooves are provided between the adjacent projections as external fluid passage portions for allowing the external fluid to flow; and   a tank including a plurality of tube insertion portions defining openings in which ends of the tubes are disposed, wherein   each of the tube insertion portions is configured such that a perimeter surface defining the opening thereof entirely covers at least one external fluid passage portion of the end of the tube.   
     
     
         2 . The heat exchanger according to  claim 1 , wherein
 the plurality of projections are arranged at a regular pitch in the longitudinal direction of the tube, and   the perimeter surface of the opening of the tube insertion portion has a length equal to or greater than the pitch of the projections with respect to the longitudinal direction of the tube.   
     
     
         3 . The heat exchanger according to  claim 1 , wherein
 each of the tube insertion portions includes a tubular portion that projects in a direction parallel to the longitudinal direction of the tube,   the tubular portion has an inner surface and defines an opening at least as a portion of the opening of the tube insertion portion, and   the inner surface of the tubular portion is included in the perimeter surface of the opening of the tube insertion portion.   
     
     
         4 . The heat exchanger according to  claim 3 , wherein the tubular portion projects outside of the tank. 
     
     
         5 . The heat exchanger according to  claim 3 , wherein the tubular portion projects inside of the tank. 
     
     
         6 . The heat exchanger according to  claim 3 , wherein the tubular portion is formed by burring. 
     
     
         7 . The heat exchanger according to  claim 3 , wherein
 the tank has a plurality of tank members each defining a plurality of openings, the plurality of tank members are disposed such that the openings thereof are aligned with each other and the openings of the tube insertion portions are provided by the openings of the tank members,   the tubular portions are provided by at least one of the tank members, and   the perimeter surface of the opening of each tube insertion portion is provided by the inner surface of the tubular portion and a surface that defines the opening of the remaining tank member.   
     
     
         8 . The heat exchanger according to  claim 3 , wherein
 the tank has a tank member defining a plurality of openings and tubular members each defining an opening,   the tank member and the tubular members are joined with each other such that the openings of the tubular members correspond to the openings of the tank member, and the opening of each tube insertion portion is provided by one opening of the tank member and the opening of one tubular member, and   the tubular portions are provided by the tubular members.   
     
     
         9 . The heat exchanger according to  claim 1 , wherein
 the tank has a plurality of tank members each defining a plurality of openings,   the plurality of tank members are disposed such that the openings thereof are aligned with each other and provide the openings of the tube insertion portions, and   the perimeter surface of the opening of each tube insertion portion is provided by surfaces that define the openings of the tank members.