Heat exchanger

Abstract

A core plate of header tanks in a heat exchanger includes a tube joint portion on which a plurality of tube insertion holes is formed, a receiving portion surrounding the tube joint portion and housing a tip part adjacent to the core plate in the tank body portion, and a inclined portion connecting between the receiving portion and the tube joint portion and inclined with respect to a longitudinal direction of the tube. The inclined portion is provided on the core plate such that a first virtual line extending linearly along the inclined portion from the receiving portion toward the tube joint portion and a second virtual line extending linearly along the tube joint portion in a direction of a long diameter in a cross section of the tube are intersected outside of the tube in the width direction of the tube.

What is claimed is: 
     
         1 . A heat exchanger, comprising:
 a core portion having a plurality of tubes formed as a flat shape and stacked with each other; and   header tanks provided on an end part of the tube in a longitudinal direction of the tube and communicating with the plural tubes, wherein   the header tanks comprises:
 a core plate brazed and joined to the plural tubes in a state that the end parts of the tubes in the longitudinal direction of the tubes are inserted in a plurality of tube insertion holes, and 
 a tank body portion fixed to the core plate and forming a space communicating with the plural tubes together with the core plate, wherein
 the core plate comprises:
 a tube joint portion in which the plural tube insertion holes are formed, 
 a receiving portion surrounding the tube joint portion and housing a tip part which is close to the core plate in the tank body portion, and 
 an inclined portion connected between the receiving portion and the tube joint portion, and inclined with respect to the longitudinal direction of the tube, wherein 
  a first virtual line is defined as extending linearly along the inclined portion from the receiving portion toward the tube joint portion, 
  a second virtual line is defined as extending linearly along the tube joint portion in a direction of a long diameter in a cross section of the tube, and 
  the inclined portion is provided on the core plate such that an intersection between the first virtual line and the second virtual line is positioned outside of the tube in the width direction of the tube. 
 
 
   
     
     
         2 . The heat exchanger according to  claim 1 , wherein
 in the tube joint portion, the plural tube insertion holes are formed so as to be arranged at a predetermined interval in a stacking direction of the tube, and a rib is formed between adjacent ones of the tube insertion holes and in a position corresponding to an end part of the tube in the width direction of the tube, the rib being recessed away from an end part of the tube in the longitudinal direction of the tube.   
     
     
         3 . The heat exchanger according to  claim 1 , wherein
 a tube-intersection distance is defined as a distance from an intersection between the first virtual line and the second virtual line to the end part of the tube in the width direction of the tube in a stacking direction of the tube, and   the inclined portion is provided on the core plate such that the tube-intersection distance is set to be between 0.0 and 2.4 mm.   
     
     
         4 . The heat exchanger according to  claim 1 , wherein
 a tube-intersection distance is defined as a distance from an intersection between the first virtual line and the second virtual line to the end part of the tube in the width direction of the tube in a stacking direction of the tube, and   the inclined portion is provided on the core plate such that the tube-intersection distance is set to be larger than 0.0 mm and to be 2.4 mm or less.   
     
     
         5 . The heat exchanger according to  claim 1 , wherein
 the tip part in the tank body portion is caulked and fixed to the core plate in a state that the tip part is housed in the receiving portion.   
     
     
         6 . The heat exchanger according to  claim 1 , wherein
 the plural tube insertion holes are formed to be arranged at a predetermined interval in a stacking direction of the tube in the tube joint portion, and   the inclined portion is provided to overlap respectively the plural tube insertion holes in the direction of the long diameter in the cross section of the tube.   
     
     
         7 . The heat exchanger according to  claim 1 , wherein
 a tube-intersection distance is defined as a distance from an intersection between the first virtual line and the second virtual line to the end part of the tube in the width direction of the tube in a stacking direction of the tube, and   the inclined portion is provided on the core plate such that the tube-intersection distance is set to be between 0.4 and 1.9 mm.