Patent ID: 6497274
Filing Date: 2002-12-24
Classification: F28D,Y10S

Abstract:
A heat exchanger comprising:a plurality of stacked plate pairs consisting of face-to-face, mating ringlike plates, each plate having a peripheral flange, annular inner and outer primary bosses each having a portion thereof located in a common first plane with said peripheral flange, an annular secondary boss having a portion thereof located in a second plane spaced from said first plane and parallel thereto, and an intermediate area located between said inner and outer primary bosses, said peripheral flanges and said primary bosses in said mating plates being joined together, the intermediate areas of each plate pair having spaced-apart portions to form an inner flow passage between the plates; the secondary boss of each plate being located adjacent to one of said primary bosses and on a side thereof furthest from the other of said primary bosses; both said primary bosses and said secondary bosses having openings formed therein for passage of first and second heat exchanging fluids respectively; said secondary bosses being arranged such that in back-to-back plate pairs, the secondary bosses are joined and the respective openings therein communicate to define a manifold for the flow of said second heat exchange fluid, and the intermediate areas of back-to-back plate pairs defining outer flow passages therebetween, wherein said primary bosses of at least one plate of each pair include radially extending ribs formed about the circumference of at least one primary boss of the at least one plate and extending substantially across the respective primary boss, said ribs being located between and separated from said openings formed in the primary boss and forming crossover passages so that the crossover passages of each plate pair permit said secondary heat exchange fluid to flow across its respective primary bosses and through its respective inner flow passage.