Patent ID: 6340055
Filing Date: 2002-01-22
Classification: F28D,F28F

Abstract:
A heat exchanger comprising:a flat tube having an end portion in a longitudinal direction thereof, the end portion having an end portion width smaller than a tube width which is a width of the tube at a portion other than the end portion, the end portion width and the tube width being perpendicular to the longitudinal direction and parallel to a cross-sectional long side direction of the tube, the tube defining therein a plurality of passage holes in which a first fluid flows, the plurality of passage holes being arranged in the cross-sectional long side direction within the end portion width to open at the end portion; a fin joined to the tube to facilitate heat exchange between the first fluid flowing inside the tube and a second fluid flowing outside the tube; and a tank connected to the end portion of the tube to communicate with the plurality of passage holes, wherein: the end portion is formed by a cut surface which extends in the longitudinal direction and determines the end portion width; the plurality of passage holes include a hole disposed most adjacently to the cut surface and defining a specific distance &dgr;0 from the cut surface to be prevented from being crushed when the cut surface is formed.