Plate-type heat exchanger

Abstract

A plate-type heat exchanger includes heat-exchange plates which are mutually stacked and facing each other so as to define, in the space between them, at least two passage channels. The heat-exchange plates have respective entry apertures which are substantially mutually adjacent so as to define an entry conduit. The entry conduit is connected with the passage channel of the corresponding fluid through at least one orifice. The entry apertures have respective collar-like edgings. Each one of the collar-like edgings has an abutment flange which extends radially with respect to the axis of the entry apertures and is adapted to engage, by contact, the abutment flange of the collar-like edging of an adjacent heat-exchange plate.

1 - 6  (canceled) 
     
     
         7 . A plate-type heat exchanger comprises: a plurality of heat-exchange plates which are mutually stacked and facing each other to define, in a space comprised between said heat-exchange plates, at least two passage channels, which alternate with each other along a direction of stacking of the heat-exchange plates and are passed through by respective fluids adapted to exchange heat with each other, said heat-exchange plates having respective entry apertures which are substantially mutually adjacent to define an entry conduit for one of said fluids, said entry conduit being connected with the passage channel of the respective fluid through at least one orifice, said entry apertures having respective collar-like edgings which extend from the edge of said entry apertures along a direction that is substantially parallel to the axis of said entry apertures, wherein each one of said collar-like edgings has, at an opposite end thereof from an end connected to an edge of the corresponding entry aperture, an abutment flange which extends radially with respect to an axis of said entry apertures and is adapted to engage, by contact, the abutment flange of the collar-like edging of an adjacent heat-exchange plate. 
     
     
         8 . The plate-type heat exchanger according to  claim 7 , wherein each one of said heat-exchange plates extends between at least one first plane of arrangement and at least one second plane of arrangement, which are mutually parallel and spaced apart, and has, around the corresponding entry aperture, at least one flat annular abutment zone which is adapted to be in contact with a corresponding flat annular abutment zone of an adjacent heat-exchange plate, said at least one flat annular abutment zone lying substantially at said first plane of arrangement, said abutment flange lying substantially at said second plane of arrangement. 
     
     
         9 . The plate-type heat exchanger according to  claim 8 , wherein said flat annular abutment zone of at least one of said heat-exchange plates has a ridge in relief, which extends around at least one portion of the edge of the corresponding entry aperture and is adapted to engage a corresponding indentation defined in the corresponding flat annular abutment zone of the adjacent heat-exchange plate. 
     
     
         10 . The plate-type heat exchanger according to  claim 8 , wherein said at least one orifice is provided by at least one slot defined on the flat annular abutment zone of at least one of the mutually adjacent heat-exchange plates. 
     
     
         11 . The plate-type heat exchanger according to  claim 7 , wherein said collar-like edgings are provided in a separate piece with respect to a remaining part of the corresponding heat-exchange plate. 
     
     
         12 . The plate-type heat exchanger according to  claim 7 , wherein said collar-like edgings are joined to the remaining part of the corresponding heat-exchange plate by way of brazing.