Control for cryogenic freezing tunnel

Refrigeration – Automatic control – Time or program actuator

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62223, 236 15BG, F25D 700

Patent

active

041423763

ABSTRACT:
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 inverval. 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.

REFERENCES:
patent: 3393868 (1968-07-01), Griem, Jr.
patent: 3613386 (1971-10-01), Klee
patent: 3699694 (1972-10-01), Hales et al.

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