Plate heat exchanger for promoting turbulent flow

Claim 1

THE COMBINATION OF A PAIR OF HEAT EXCHANGE PLATES DISPOSED IN GENERALLY PARALLEL SPACED RELATION, A PACKING CORD COMPRESSED BETWEEN SAID PLATES AND EXTENDING ALONG THE MARGINAL PORTIONS THEREOF, SAID PLATES AND CORD DEFINING A LONGITUDINAL PATH FOR FLOW OF A FLUID MEDIUM BETWEEN THE PLATES FROM ONE END PORTION TO THE OPPOSITE END PORTION OF THE PLATES, SAID PLATES HAVING SPACED OPPOSING SURFACES LOCATED WITHIN THE CONFINES OF THE MARGINAL PACKING CORD AND FORMED WITH CORRUGATIONS DEFINING RIDGES AND VALLEYS EXTENDING GENERALLY TRANSVERSELY OF SAID LONGITUDINAL FLOW PATH TO PROVIDE SAID FLOW PATH WITH A WAVE-LIKE FORM, AND A PERFORATED PLATE MEMBER IN SAID PATH RELEASABLY SECURED TO ONE OF THE PLATES AND LYING WHOLLY WITHIN THE CONFINES OF THE PACKING CORD, WHEREBY SAID MEMBER IS REMOVABLE FROM THE PLATES INDEPENDENTLY OF THE PACKING CORD, SAID PERFORATED PLATE MEMBER EXTENDING TRANSVERSELY OF THE RIDGES WHILE SUBSTANTIALLY SPANNING THE VALLEYS OF THE CORRUGATIONS OF EACH SAID OPPOSING PLATE SURFACE AND HAVING PERFORATIONS POSITIONED FOR FLOW OF SAID FLUID MEDIUM ALONG SAID PATH IN ZIG-ZAG FASHION ALTERNATELY ON ONE SIDE AND THEN THE OTHER SIDE OF SAID PLATE MEMBER.