Oval tube heat exchanger

Claim 1

A heat exchanger, comprising: a core comprising a plurality of plate like metal fins located generally parallel to each other, each of said fins having a plurality of spaced apart oval shaped apertures formed therethrough with each fin having each aperture aligned with a corresponding aperture of an adjacent fin such that a plurality of spaced apart aligned apertures extend through said plurality of fins, a plurality of oval shaped metal flow tubes extending through said plurality of spaced apart aligned apertures respectively with said flow tubes having end portions extending beyond an end of said core, a manifold with port means coupled to said end of said core to allow fluid flow between said end portions of said tubes and said port means of said manifold, seal means located between said end of said core and said manifold to form a seal therebetween, said seal means comprising: a first plastic plate member having a plurality of spaced apart oval shaped apertures formed therethrough equal in number to the number of said flow tubes and located to tightly receive said end portions of said flow tubes respectively and also having a plurality of spaced apart oval shaped extension tubes extending from one side of said first plastic plate member from said oval shaped apertures of said first plastic plate member respectively for tightly receiving said flow tubes, and a second plastic plate member having a plurality of oval shaped apertures formed therethrough equal in number to said extension tubes for tightly receiving said plurality of extension tubes respectively.