Liquid cryogenic freezer with improved vapor balance control

Details Liquid cryogenic freezer with improved vapor balance control Liquid cryogenic freezer with improved vapor balance control

F - Mech Eng,Light,Heat,Weapons

25

D

F25D 17/04 (2006.01) F25D 3/11 (2006.01) F25D 17/02 (2006.01) F25D 23/02 (2006.01) F25D 25/04 (2006.01)

Patent

CA 2072152

2072152 9108429 PCTABS00005 A cryogenic freezer apparatus (10) for food products includes a conveyor (18) within a thermally insulated enclosure (12). A cryogen injecting unit (34) is located in said enclosure (12) adjacent the opening thereof, and responsive to a cryogen control signal for introducing liquid cryogen in said enclosure (12). A blower unit (30) in said enclosure (12) directs cryogen vapor away from said enclosure opening (14) toward the interior of said enclosure (12). The output of said blower unit (30) being controllable by a blower control signal. A sensing unit (52) within said enclosure (12) 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 (14).

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