Patent ID: 6155338
Filing Date: 2000-12-05
Classification: F28D,F28F,Y10S

Abstract:
A heat exchanger comprising axially extending high-temperature and low-temperature fluid passages formed circumferentially alternately between axially-extending radial walls filling an annular space defined between a radially outer cylindrical wall and a radially inner cylindrical wall, said radial walls formed by folding a folding plate blank comprised of a plurality of first heat transfer plates and a plurality of second heat transfer plates connected alternately through folding lines, in a zigzag fashion, so that the first and second heat transfer plates are disposed radially between and engaging the radially outer and inner cylindrical walls, said high-temperature and low-temperature fluid passages being formed circumferentially alternately between the adjacent first and second heat transfer plates, high-temperature fluid passage inlets and high-temperature fluid passage outlets being formed to open into axially opposite ends of said high-temperature fluid passages, low-temperature fluid passage inlets and low-temperature fluid passage outlets being formed to open into axially opposite ends of said low-temperature fluid passages;said high-temperature fluid passage inlets being formed by cutting axially opposite ends of said first and second heat transfer plates into an angle shape having two end edges, said high-temperature fluid passage inlets being formed by closing one of said two end edges at axially one end of each of said high-temperature fluid passages and opening the other end edge, said high-temperature fluid passage outlets being formed by closing one of said two end edges at the axially other end of each of said high-temperature fluid passages and opening the other end edge, said low-temperature fluid passage inlets being formed by closing said other end edge at the axially other end of each of said low-temperature fluid passages and opening said one end edge, said low-temperature fluid passage outlets being formed by closing said other end edge at the axially one end of each of said low-temperature fluid passage; andprojection stripes formed on the adjacent first and second heat transfer plates to extend along said end edges, said end edges being closed by having tip ridges of said projection stripes of opposed heat transfer plates abut against each other.