A plate-type heat exchanger and related plates

Claim 2

A plate (51) as in claim 1 comprising a plurality of ribs (52,53,54,55) raised above one face of said plate and recessed below the other face plate, each rib extending in one of said flat portions (62,63,64,65) spacing said rib bands, alternately from one or the other of said side walls (155,56) of greater lenght to section of said flat portion intermediate to said side walls of greater lenght, so as to form a meander path in the plane of said plate.

Claim 3

A plate according to claim 1 or 2 wherein said ribs of at least a pair of adjacent bands (57,58,59,60,61,68,69,70,71,72) extend, at least in proximity of said flat spacing portion with slanting oriented in opposite direction from band to band, and transverse to the direction of the ribs in the other band of the pair.

Claim 4

A plate according to claims 1,2,3 wherein at leat said two side walls of greater lenght (155,56) of said rim are convex and form a cone-shaped surface for coupling of adjacent plates.

Claim 5

A plate-type heat exchanger wherein a plurality of ribbed plates are juxtaposed and secured to one another to form a bank of chambers consisting of first and second sets of mutually adjacent chambers, the chambers of each set being communicated to one another by two sets of respectively inlet and outlet openings, each chamber of the first set being placed betweentwo chambers of the second set except the end chambers in the bank, characterized in that said bank of chambers is formed by alternately juxtaposing plates of a first type (1,51) and a second type (21,67), the plates of the first type (1,51) being provided with a first plurality of parallel ribs (10,11,12,13,52,53,54,55) raised above one face of said plate (1,51) and recessed below the other plate face and being offset from one another which, on contacting a corresponding surface of a plate of the second type (21,67), form a meander chamber of a first type lying in the plane of said plates by juxtaposition of a plate of the second type (21,67) to the face with raised ribs of said first-type plate (1,51), and a chamber of a second type with no meander in the plane of said plates by juxtaposition of a plate of the second type (21,67) to the face with recessed ribs of said first-type plate (1,51), both plate types being provided with a second plurality of ribs (15,17,18,19,20,31,32,33,34,35) arranged likewise on either plate types, whereby on juxtaposing the two plate types in an order whatever said second plurality of ribs form a labyrinth chamber extending perpendicularly to the plane of said plates.

Claim 6

A heat exchanger as in Claim 5, wherein said surface of contact with said first plurality of ribs is the flat surface of said plate of the second type.

Claim 7

A heat exchanger as in Claim 5, wherein said surface of contact with said first plurality of ribs is the tip of a third plurality of raised ribs on said second-type plate projecting in the opposite direction from that of said first plurality of ribs.

Claim 8

A heat exchanger as in claims 5,6,7, wherein said second plurality of ribs comprises a first set (17) of elongate ribs extending in a transverse direction to the direction of flow through said meander chamber.

Claim 9

A heat exchanger as in Claim 8, wherein said second plurality of ribs comprises a second set (19) of elongate ribs extending in the direction of flow through said meander chamber.

Claim 10

A plate (1,21,51,67) for a plate-type heat exchanger wherein a plurality of ribbed plates are justaposed and secured to one another to form a bank of chambers consisting of first and second sets of mutually adjacent chambers, the chambers of each set being communicated to one another by two sets of respectively inlet and outlet openings, each chamber of the first set being placed between two chamber of the second set except the end chambers in the bank, said plate (21,67) having a generic rectangular shape, a rim with two opposed side walls (155,56) of greater lenght and two opposed side walls of lesser lenght and four openings (22,23,24,25) located at corners of said plate (21,67), characterised by that at least said pair of opposed side wall of greater lenght (155,56) of said rim are convex and form a cone-shaped surface for coupling among adjacent plates.