Patent ID: 6073688
Filing Date: 2000-06-13
Classification: B21C,F28D,F28F

Abstract:
A flat tube for a heat exchangerformed by bending a single plate or overlaying two plates characterized in thatlong beads in a plurality of rows are formed on the single plate or two plates in the longitudinal direction of the single plate or two plates,portions of the plate or two plates to which said long beads are opposed are formed flat, and the tops of the respective long beads and said flat portions of the plate or two plates are joined together, thereby forming a plurality of passages by said long beads and said flat portions, andsaid flat tube is provided with tube insertion sections to be inserted into tube insertion holes of a header tank, said tube insertion section are formed by pressing back sections at ends of said long beads to a flat form such that the respective long beads are terminated at an equal distance from the outer periphery of the header tank having a circular or an elliptical shape.