Heat exchanger with plate structure

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).