FIELD: heating.
SUBSTANCE: heat exchanger comprises a package of heat exchanging plates (1, 1a, 1b, 1c) formed from metal sheet having a three dimensional pattern (2, 3), each plate (1, 1a, 1b, 1c) of the heat exchanger has a groove (10) in which a gasket (9) is located, and the said groove (10) has a bottom inner surface (11), and the said bottom inner surface (11) has at least one protrusion (14, 15) directed towards the said adjacent heat exchanging plate (1a). On the part of the said protrusion (14, 15), the said gasket (9) is compressed greater than on the part located outside of the said protrusion (14, 15).
EFFECT: minimising the risk of fluid leakage.
15 cl, 6 dwg
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