Patent ID: 6918433

Claim:
Heat exchanger ( 1 ) with plate structure, preferably welded, intended for the heat transfer between substances in the same or in different states, such as a gas and a liquid, comprising a closed stack ( 6 ) of plates consisting of circular heat transfer plates ( 10 ) used as heat transfer surfaces and connected to each other at their peripheries ( 13 ) or at the peripheries of their flow openings ( 11 , 12 ), one heat transfer medium flowing inside said stack ( 6 ), a housing unit ( 2 ) used as a pressure vessel and consisting of ends ( 4 , 5 ) supporting the stack ( 6 ) of plates and the surrounding housing ( 3 ), another heat transfer medium flowing inside said housing unit ( 2 ), and inlet and outlet passages ( 7 , 8 , 27 , 28 ) for the heat transfer media flowing in the stack ( 6 ) of plates and in the housing unit ( 2 ), extending through the housing ( 3 ) and the ends ( 4 , 5 ), characterized in that on the periphery ( 13 ) of the stack ( 6 ) of plates, inside the housing ( 3 ), there are flow guides ( 21 , 22 ) for the heat transfer medium flowing inside the housing unit ( 2 ), having an internal tube structure and being at least partly connected to the stack ( 6 ) of plates, that there are at least two flow guides ( 21 , 22 ) with an internal tube structure, being preferably arranged on opposite sides of the stack ( 6 ) of plates, and that the flow guides ( 21 , 22 ) are connected to the inlet and outlet passages ( 27 , 28 ) of the housing unit ( 2 ) by means of tubes ( 30 , 31 ) arranged at least partly in the passages, of which at least one is connected in a leakproof manner, preferably by welding, to the inner surface of the inlet and/or outlet passage ( 27 , 28 ) of the housing unit ( 2 ).