Heat exchanger

Abstract

A heat exchanger ( 20 ) includes a plurality of tubes ( 23 ) with a fluid flowing therein and header tanks ( 21 ) arranged at the longitudinal ends of the tubes ( 23 ) and comunicating with the plurality of the tubes ( 23 ). The header tanks ( 21 ) each include a core plate ( 27 ) coupled with the tubes ( 23 ) and a tank body ( 31 ) coupled to straight portions ( 29 ) holding the joints of the core plate ( 27 ) with the tubes ( 23 ) and forming an internal space of the tank together with the core plate ( 27 ). The cross section of the each header tank ( 21 ) configured of the core plate ( 27 ) and the tank body ( 31 ) is in the shape of an ellipse or a polygon similar to an ellipse, and the aspect ratio of the ellipse inscribed in the cross section of the header tank ( 21 ) is between 0.95 and 1.05 inclusive. Thus, the header tanks of the heat exchanger have a strength capable of sufficiently resisting an increased supercharge pressure.

1 . A heat exchanger comprising: 
 a plurality of tubes, a fluid flows therein; and    a pair of header tanks arranged at the longitudinal ends of the tubes and communicating with the plurality of the tubes, the header tanks each including:    a core plate having both ends portion between which the plurality of tubes are connected with the core plate, and    a tank body coupled to the end portions of the core plate, thereby forming an internal space of the tank together with the core plate; and    wherein an outside portion of a cross section of the header tank substantially perpendicular to a longitudinal direction of each header tank which extends from one to the other of joints where the tube is connected with the core plate including the cross section of the tank body is in the shape of an ellipse, or a polygon similar to an ellipse, and wherein the aspect ratio of the ellipse inscribed in the outside portion is between 0.95 and 1.05 inclusive.    
   
   
       2 . A heat exchanger according to  claim 1 , 
 wherein joints between the core plate and the tank body are formed with a straight portion, constituting a joint margin.    
   
   
       3 . A heat exchanger according to  claim 1 , 
 wherein the header tank has end openings coupled with a cap.    
   
   
       4 . A heat exchanger comprising: 
 a plurality of tubes a fluid flows therein; and    a pair of header tanks arranged at the longitudinal ends of the tubes and communicating with the plurality of the tubes, the header tanks each including:    a core plate having both ends portion between which the plurality of tubes are connected with the core plate, and    a tank body coupled to the end portions of the core plate, thereby forming an internal space of the tank together with the core plate; and    wherein a cross section of the header tank substantiality perpendicular to a longitudinal direction of the header tank is in the shape of an ellipse or a polygon similar to an ellipse, and wherein the aspect ratio of the ellipse inscribed in the header tank is between 0.95 and 1.05 inclusive.    
   
   
       5 . A heat exchanger according to  claim 4 , 
 wherein joints between the core plate and the tank body are formed with a straight portion constituting a joint margin.    
   
   
       6 . A heat exchanger according to  claim 4 , 
 wherein the header tank has an openings coupled with a cap.