Patent ID: 6374910
Filing Date: 2002-04-23
Classification: F28D,F28F

Abstract:
A heat exchanger, comprising a plurality of first heat-transfer plates (S1) and a plurality of second heat-transfer plates (S2) disposed radiately in an annular space defined between a radially outer peripheral wall (6) and a radially inner peripheral wall (7), and a high-temperature fluid passage (4) and a low-temperature fluid passage (5) which are defined circumferentially alternately between adjacent ones of said first and second heat-transfer plates (S1 and S2) by bonding pluralities of projections (22 and 23) formed on said first and second heat-transfer plates (S1 and S2) to one another,axially opposite ends of each of said first and second heat-transfer plates (S1 and S2) being cut into angle shapes each having two end edges with an apex portion disposed between and projecting from the two end edges, thereby defining a high-temperature fluid passage inlet (11) by closing one of said two end edges and opening the other end edge at axially one end of said high-temperature fluid passage (4), and defining a high-temperature fluid passage outlet (12) by closing one of said two end edges and opening the other end edge at the axially other end of said high-temperature fluid passage (4), defining a low-temperature fluid passage outlet (16) by opening one of said two end edges and closing the other end edge at axially one end of said low-temperature fluid passage (5), and defining a low-temperature fluid passage inlet (15) by opening one of said two end edges and closing the other end edge at the axially other end of said low-temperature fluid passage (5), each of the first and second heat-transfer plates having a first flange portion and a second flange portion disposed opposite the first flange portion, each of the first and second flange portions being respective folded ones of the apex portions of the angle shape, respective first and second flanges sized and folded to be superposed one on another and bonded together, wherein said high-temperature fluid passage inlet (11) and said low-temperature fluid passage outlet (16) are partitioned from each other in fluidic isolation by said superposed first flange portions (26) being disposed therebetween and wherein said high-temperature fluid passage outlet (12) and said low-temperature fluid passage inlet (15) are partitioned from each other in fluidic isolation by the superposed second flange portions (26 disposed therebetween.