Patent ID: 8353330

Claim:
A heat exchanger, comprising: a pair of header tanks spaced apart from each other by a predetermined distance and disposed parallel to each other, each header tank having a partition wall for partitioning an internal compartment; an inlet pipe and an outlet pipe formed in the header tank; a plurality of tubes, each tube being fixed by the pair of the header tanks at both ends thereof to form a passage for a heat exchanging medium, thereby permitting the heat exchanging medium in an inside of the compartment partitioned by the partition wall to flow; and a plurality of fins interposed between the tubes, wherein each of the pair of header tanks is formed by coupling of a tank, which is formed by bending a first plate, and a header formed by bending a second plate, the header is formed in a “W” shape cross-section in such a manner that in the partition wall for partitioning the internal compartment, entire surfaces of a first wall and a second wall are faced and joined to each other and a first protrusion part and a second protrusion part, protruding in the same direction as the direction in which the partition wall is formed, are formed at opposite sides of the second plate in a longitudinal direction of the plate so as to provide a coupling face with the tank, the tank includes a plurality of chambers inside and defined by the partition wall corresponding to the first and second walls, and the first and second protrusion parts, a portion of one of the first wall and the second wall forming the partition wall being cut completely therethrough to form a discharge part, the discharge part being completely overlapped by the other of the first and the second wall, thereby exposing the other of the first and the second wall to the chamber adjacent the discharge part; at least one communication part comprising a hole extending completely through the partition wall, wherein no portion of the discharge part and the communication part overlap; wherein a plurality of discharge parts are formed alternately in the first wall and the second wall in a longitudinal direction of the header tank.