Patent ID: 7941921

Claim:
A method for the production of heat exchangers of the so-called plate type, comprising the operative steps of: juxtaposing a couple of substantially identical metal plates; fixing together said juxtaposed plates to one another by means of welding performed at respective perimetric sides; further fixing together said juxtaposed plates to each other by means of a plurality of welding tracts, arranged in at least two alignments, parallel and adjacent to a couple of opposite perimetric sides of the plates themselves, and at a pre-established spaced relationship from said sides; introducing a fluid under pressure between said juxtaposed metal plates, to form a hollow, substantially box-shaped body, in which an internal chamber and two substantially tubular passages, formed between said couple of opposite perimetric sides and the respective adjacent alignments of the welding tracts, are defined, said substantially tubular passages having an axis parallel to said opposite perimetric sides and being in fluid communication with said internal chamber; cutting said hollow body along said substantially tubular passages and in the direction of their axis, thus obtaining a hollow body equipped, on opposite sides, with substantially semi-tubular passages, open towards the outside of the body itself; and associating with said substantially semi-tubular passages, respective distributor duct and collector duct, destined to distribute and respectively collect a heat exchange operative fluid into and from said internal chamber.