Patent ID: 6973805

Claim:
A layered heat exchanger comprising a multiplicity of intermediate plates arranged side by side, and a pair of end plates disposed respectively at left and right sides of the arrangement, each of the intermediate plates having an upper header forming portion provided with a pair of front and rear fluid passage holes and a tube forming recessed portion, the multiplicity of intermediate plates being fitted together in juxtaposed layers, with the recessed portion of each intermediate plate opposed to the recessed portion of the intermediate plate immediately adjacent thereto to thereby provide juxtaposed flat tubes and a front and a rear upper header interconnecting the flat tubes, one of the end plates having a fluid inlet through hole in communication with one of the front and rear upper headers and a fluid outlet through hole in communication with the other upper header, the layered heat exchanger being characterized in that at least one of the two through holes formed in the end plate is at least partly covered with a fluid diffusing portion having a plurality of small holes, wherein the through hole covered with the fluid diffusing portion is circular, and the fluid diffusing portion has a spherical surface.