Heat exchanger

Claim 1

In a heat exchanger having an exchanger pack which comprises a plurality of individual foil-type rectangular plates spaced from one another, said plates define edges and at their corners at corner pack edges thereof have triangular corner notches between which marginal strips of said plates extend, said plates in pairs at two oppositely-lying plate edges flatly lie one upon the other with said marginal strips extending between said corner notches forming alternately crossing flow-through passages between said plates and at said marginal strips the plates are connected with one another, a frame housing surrounding the exchanger pack, said frame housing comprising two covers which are disposed adjacent outer plates of the exchanger pack and four struts connecting the covers at their corners, said struts being operatively connected in sealing fashion with the corner pack edges of the exchanger pack which corner pack edges contain the corner notches of the plates, the struts, on sides thereof facing the corner pack edges of the exchanger pack which corner pack edges contain the corner notches of the plates, being formed with a triangular recess, the improvement wherein said triangular recess having a depth greater than the depth of the corner notches, said corner pack edges with the corner notches as well as with the ends of the respectively connected said marginal strips, adjacent to the corner notches, of the plates, project into said recesses, respectively, and a sealing filling fills up said recesses on said struts up to beyond said corner notches, said triangular recess constitutes a mold form for sealing said sealing filling both to said struts and to said corner pack edges with the corner notches as well as with the ends of the respectively connected said marginal strips when said exchanger pack is mouonted in said frame housing, said sealing filling consisting of a molding resin which is poured into the mold form with the exchanger pack mounted in the frame housing.