Heat exchanger having header tank increased in volume in the vicinity of pipe connected thereto

A heat exchanger comprising:

• a plurality of tubes through which fluid flows;
• a tank disposed at a flow-path end of each tube to extend in a direction perpendicular to a longitudinal direction of each tube and communicating with each tube, the tank including
• an opening open in a direction at a preset angle to a longitudinal direction of the tank and connectable to an external pipe, and
• an elevated portion elevated outwardly in the vicinity of the opening,
• wherein a dimension of the tank including the elevated portion in a direction perpendicular to the longitudinal direction of the tank is larger than a dimension of the tank excluding the elevated portion in the direction perpendicular to the longitudinal direction of the tank;
• the opening is formed into a substantially circular shape;
• and
• the dimension of the tank excluding the elevated portion is smaller than a diameter of the opening.

A heat exchanger comprising:

• a plurality of tubes through which fluid flows;
• a first tank disposed at a first flow-path end of each tube to extend in a direction perpendicular to a longitudinal direction of each tube and communicating with each tube, the first tank including a first opening disposed at an end of the first tank in a longitudinal direction thereof, and a first elevated portion elevated outwardly in the vicinity of the first opening, the first elevated portion being provided on the same surface of the first tank as the first opening;
• a second tank disposed at a second flow-path end of each tube to extend in the direction perpendicular to the longitudinal direction of each tube and communicating with each tube, the second tank including a second opening disposed at an end of the second tank in a longitudinal direction thereof, and a second elevated portion elevated outwardly in the vicinity of the second opening, the second elevated portion being provided on the same surface of the second tank as the second opening, wherein:
• the fluid flows into the first opening and is discharged from the second opening;
• the first opening and the second opening are disposed diagonally;
• a dimension of the first tank including the first elevated portion in a direction perpendicular to the longitudinal direction of the first tank is larger than a dimension of the first tank excluding the first elevated portion in the direction perpendicular to the longitudinal direction of the first tank;
• and
• a dimension of the second tank including the second elevated portion in a direction perpendicular to the longitudinal direction of the second tank is larger than a dimension of the second tank excluding the second elevated portion in the direction perpendicular to the longitudinal direction of the second tank.