PLATE-TYPE HEAT EXCHANGER Russian patent published in 2009 - IPC F28D9/00 

FIELD: heating.

SUBSTANCE: invention relates to the sphere of heating machinery immediately dealing with design of plate-type heat exchanger elements; the proposed device, particularly compatible with flow-type instantaneous gas water heaters, is to be employed in multiple industry sectors whenever liquid and/or gaseous media heating/cooling is required. The plate-type heat exchanger is equipped with nipples for delivery and discharge of one of the media, an upper and a lower collectors and a package of plates with arrays of perforations. The perforations tapered flanges fit in the perforations of the adjacent plate to form ducts. The flanges have varied wall thickness decreasing towards the edge. The plate perforations are elliptical-shaped. Each collector is composed of a cover and a collector plate, joined together. The elliptical perforations arranged in the collector plates have tapered flanges. Each cover is composed of serially connected bypass chambers and alternating flat sections attached to the chambers' baseplates. Each chamber consists of a rectangular and a convex parts. The height of each collector rectangular and convex parts must be no less than 0.2÷0.5 of the elliptical perforation major axis length. The chamber convex part cross-section may be profiled as a circular arc or an elliptical arc. The plate package ducts and the bypass chambers of the upper and the lower collectors may be serially connected under a multiway or a parallel-sequential pattern. The bypass chambers of the upper and the lower collectors are positioned over each two or more elliptic perforations of the collector plate and offset relative to each other by at least a spacing between the axes of the elliptical cross-sectioned ducts. In the cover there are flanged flat ellipse profiled perforations additionally arranged with nipples mounted thereon. The tapered flanges of the lower collector plate perforations project over the plane and are positioned inside the lower collector bypass chambers. Height of each flange must be no less than 0.4÷0.8 of the elliptic perforation minor axis length. The tapered flanges of the adjacent package plate perforations are fitted in the lower collector plate perforations. The delivery and discharge nipples consist of a tapered part and a flat ellipse profiled part conjugated with the flanges of the flat ellipse profiled perforations arranged in the covers. The heat exchanger may be additionally equipped with an inlet and an outlet chambers positioned over each two or more elliptic perforations of the collector plate.

EFFECT: enhanced reliability, pressure integrity and effectiveness of the heat exchanger, minimisation of hydraulic losses in the collectors and reduction of the heat exchanger overall dimensions combined with the manufacture technique simplification and cost efficiency improvement.

16 cl, 5 dwg