Refrigeration – Automatic control – Of external fluid or means
Patent
1989-11-30
1990-08-14
Capossela, Ronald C.
Refrigeration
Automatic control
Of external fluid or means
62266, 62374, 62380, 62381, F25D 1704
Patent
active
049476548
ABSTRACT:
A cryogenic freezer apparatus for food products includes a conveyor within a thermally insulated enclosure. A cryogen injecting unit is located in said enclosure adjacent the opening thereof, and responsive to a cryogen control signal for introducing liquid cryogen in said enclosure. A blower unit in said enclosure directs cryogen vapor away from said enclosure opening toward the interior of said enclosure. The output of said blower unit being controllable by a blower control signal. A sensing unit within said enclosure senses the cooling capacity of the cryogen vapor at the enclosure opening and generates a sensor output signal which is indicative of the amount of cryogen vapor escaping out of said opening. A control unit, coupled to said sensing unit, said injecting unit, and to said blower unit generates a cryogen control signal and a blower control signal in response to the sensor output signal. Cryogen vapor escaping from the enclosure is limited to an amount needed to maintain an air lock, thus preventing air intrusion into the enclosure.
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Lang Gary D.
Sink Brian Evan
Zyer Benjamin
Capossela Ronald C.
Liquid Carbonic Corporation
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