Patent ID: 7069982
Filing Date: 2006-07-04
Classification: B21D,F28D,F28F,Y10T

Abstract:
1. A heat transfer member for a heat exchanger, which is press-formed of a metallic thin sheet material into a prescribed shape by means of molds of a press forming device so that said heat transfer member has on at least one portion thereof a heat transfer face having opposite surfaces, which are to be brought into contact with heat exchange fluids, respectively, wherein: said heat transfer face comprises at least one set of irregularity patterns arranged in a row, each of said at least one set of irregularity patterns comprising (i) a central pattern portion having a plurality of recesses or projections provided with a prescribed pitch and a central pattern width, said central pattern portion having two pairs of opposite sides, (ii) a pair of heat exchanging irregularity pattern portions provided on one of said two pairs of opposite sides of said central pattern portion so as to be symmetrical with respect to said central pattern portion, said pair of heat exchanging irregularity pattern portions and said central pattern forming a pair of opposite connection sides extending along an other of said two pairs of opposite sides of said central pattern portion, and (iii) at least one boundary pattern portion provided on at least one of said pair of opposite connection sides, said at least one boundary pattern portion having a prescribed boundary pattern width and a plurality of recesses or projections with a prescribed pitch so as to be perpendicular to said plurality of recesses or projections of said central pattern portion, the prescribed boundary pattern width being substantially equal to the central pattern width.