Patent ID: 6666265
Filing Date: 2003-12-23
Classification: B21C,B21D,F28D,F28F,Y10T

Abstract:
A heat exchanger comprising:a plurality of tubes of a flat sectional shape, each tube made of one or two plates and having a plurality of medium passages therein and a joint portion along a side edge of said tube; a plurality of fins provided between said tubes; and a pair of tanks with which said ends of said tubes are brazed, said joint portion being made by locking a first bent portion and a second bent portion of said tube such that no gap is produced at contact portions, each of said first and second bent portions has a plurality of bent sections at end portions of said plate or an end portion of each of said two plates, wherein said plurality of bent sections of said first bent portion do not interlock with said plurality of bent sections of said second bent portion when said joint portion is formed.