Patent ID: 6880623

Claim:
A heat exchanger ( 10 ) for heating a product, in particular a composition for producing candies, comprising a preferably cylindrically embodied housing jacket ( 11 ), receiving plates ( 12 , 13 ), disposed on the face ends of the housing jacket ( 11 ), in which plates tubes ( 14 - 20 ) for a medium that extend inside the housing jacket ( 11 ) parallel to one another are supported, closure caps ( 47 , 48 ) covering the receiving plates ( 12 , 13 ) on the side opposite the tubes ( 14 - 20 ), an inlet ( 51 ) and an outlet ( 52 ) for a heating medium as well as an inlet ( 41 ) and an outlet ( 46 ) for the product to be heated, means guiding the product in a meandering course in order to lengthen the action time of the heating medium, the tubes ( 14 - 20 ) having different diameters and being disposed concentrically to one another; one chamber ( 21 - 24 ) of annular cross section for the heating medium being embodied by each pair of tubes ( 14 , 20 ) adjacent to one another and by the outer tube and the housing jacket ( 11 ); and inlet means for introducing the heating medium into the annular chambers ( 21 - 24 ) in the region of one receiving plate ( 13 ) and outlet means for carrying the heating medium out of the annular chambers ( 21 - 24 ) in the region of the other receiving plate ( 12 ), the heating medium flowing rectilinearly through the annular chamber ( 21 - 24 ) from the direction of one receiving plate ( 13 ) in the direction of the other receiving plate ( 12 ) and then being carried directly out, wherein the tube pairs ( 14 - 20 ), forming the annular chambers ( 21 - 24 ) for the heating medium are each closed on their face ends by a respective closure ring ( 27 - 34 ); wherein the length of the tubes ( 14 - 20 ) plus the closure rings ( 27 - 34 ) is less than the spacing of the two receiving plates ( 12 , 13 ) from one another; wherein communicating with each closure ring ( 27 - 34 ) is at least one inlet and outlet tube ( 37 , 38 ) for the heating medium; wherein the inlet and outlet tubes ( 37 , 38 ) are supported sealingly in the receiving plates ( 12 , 13 ); and wherein closure rings ( 27 - 34 ) radially adjacent with respect to a receiving plate ( 12 , 13 ) alternatively contact the applicable receiving plate ( 12 , 13 ) or are spaced apart from them, to form the meandering product course.