Patent ID: 7426957

Claim:
A stack plate-type heat exchanger, comprising a large number of plates which are in the form of troughs and are stacked one inside the other, of a first and of a second type, which, between them, form flow channels with a first height h for a first medium and with a second height H for a second medium, with the plates having rims which are raised on the circumference, are soldered to one another and have different heights for the first and for the second plate type, wherein the first plate type has a rim of height h 1 with a flank angle α, and the second plate type has a higher rim which is composed of at least three sections of height H 1 , H 2 and H 3 , with the first rim section whose height is H 1 and the third rim section whose height is H 3 each having a flank angle α, while the second rim section whose height is H 2 runs at right angles to the plate base.