Dual-flow cryogenic freezer

Details Dual-flow cryogenic freezer Dual-flow cryogenic freezer

1983-08-09

1984-10-09

Capossela, Ronald C.

Refrigeration

Processes

Treating an article

62216, 62374, 62380, 62404, F25D 1306

Patent

active

044753519

ABSTRACT:
Products to be frozen are conveyed through an insulated horizontal tunnel having a plurality of individual cooling zones, each equipped with a radial fan rotating in a horizontal plane. Cryogenic liquid refrigerant is sprayed into one or more of the cooling zones in the central region of the tunnel, upwardly into the rotating fans and the thus vaporized refrigerant caused to flow in a downward direction in a recirculating pattern into contact with the conveyed products by vertical partitions between contiguous zones. The vaporized refrigerant flows from the supercold zone of liquid introduction beneath the edges of the partitions in two directions, outwardly towards the opposite ends of the tunnel in substantially equal amounts. The treated products thus undergo a continuously declining temperature gradient from inlet to outlet of the tunnel as a result of direct heat exchange with refrigerant vapor in counterflow thereto from the supercold zone to the products inlet and concurrent flow of the vapor from said supercold zone to the products outlet.

REFERENCES:
patent: Re28712 (1976-02-01), Klee
patent: 3345828 (1967-10-01), Klee et al.
patent: 3403527 (1968-10-01), Berreth et al.
patent: 3613386 (1971-10-01), Klee
patent: 3813895 (1974-06-01), Klee et al.
patent: 3892104 (1975-07-01), Klee et al.
patent: 4229947 (1980-10-01), Klee

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