Patent ID: 6957694

Claim:
A core structure of an integral heat-exchanger, comprising: at least two first tubes which extend in parallel with each other; at least two second tubes which extend in parallel with each other, said second tubes being juxtaposed with said first tubes; and a corrugated fin including a first part which is interposed at upper and lower folded edge portions thereof between said first tubes, a second part which is interposed at upper and lower folded edge portions thereof between said second tubes and a third part through which said first and second parts are integrally connected, wherein said third part of said corrugated fin is formed with louvers which extend in a direction perpendicular to the upper and lower folded edge portions of said first and second parts, and wherein said louvers comprise: a first louver part including a first elongate flat portion which is bent downward along one longer edge thereof from a major flat portion of the center part of the corrugated fin thereby to define a first air flow opening in said major flat portion and two generally triangular supporting portions which are raised from said major flat portion to support longitudinal ends of said elongate flat portion; and a second louver part including a second elongate flat portion which is bent upward along one longer edge thereof from the major flat portion of the center part of the corrugated fin thereby to define a second airflow opening in said major flat portion and two generally triangular supporting portions which are raised from said major flat portion to support longitudinal ends of the second elongate flat portion, said first and second air flow openings being merged to each other to form a united air flow opening; and said first and second louver parts being arranged in such a manner that said first and second flat portions face each other having said united air flow opening placed therebetween, wherein the first air flow opening is arranged on one side of a center line of the corrugated fin and the second air flow opening is arranged on the other side of the center line.