Control for cryogenic freezing tunnel

F - Mech Eng,Light,Heat,Weapons – 25 – D

Patent

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Details

62/112, 341/15.1

F25D 7/00 (2006.01) A23L 3/36 (2006.01) F25D 3/11 (2006.01) F25D 29/00 (2006.01) G05D 23/19 (2006.01)

Patent

CA 1111528

Abstract of the Disclosure A startup and shutdown control for a cryogenic freezing tunnel for freezing food products in which the rate of flow of cryogen into the tunnel is normally regulated by a thermal regulator, including an auxiliary flow regulator for maintaining a predetermined flow of cryogen to the tunnel independently of the thermal regulator, a first startup interval device, comprising a counter responsive to movement of the tunnel conveyor, for actuating the auxiliary flow regulator to provide a constant flow of cryogen to the tunnel after a first startup interval measured from the initiation of movement of a supply of food products to the tunnel, and a second startup interval device, comprising a timer, to cut off the flow of cryogen via the auxiliary flow regulator after a second startup interval. The control further includes a first shutdown interval device, which is also a counter, to cut off all cryogen flow to the tunnel after a first shutdown interval measured from the interruption of the food product supply, and a second shutdown interval device, a timer, to restore flow control to the thermal regulator after a second shutdown interval.

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