Cryogenic rapid food cooling machine

Refrigeration – Liquid contacting discrete commodity – With article conveyer or transporter

Patent

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Details

62380, 426524, F25D 1702

Patent

active

041576500

ABSTRACT:
A cryogenic rapid-cooling machine for reducing the temperature of cartridges each formed by a vertical stack of sealed trays containing pre-cooked meals, the trays being nested in an open carton whose walls have holes to admit gas. The machine is constituted by an open-ended tunnel having a conveyor therein to continuously advance two parallel trains of cartridges from the inlet to the outlet. The space between the trains is bordered by the carton walls to define a center aisle, while the spaces between the opposing sides of the tunnel and the open sides of the cartons define outer aisles. Disposed in these aisles are a series of partition assemblies that divide the tunnel into consecutive treatment stages. Nozzles disposed in a main cooling stage adjacent the outlet stage serve to spray the cartridges passing therethrough with a cryogenic liquid. Fans act to draw the resultant cold gas from the main cooling stage through a succession of pre-cooling stages between the main cooling stage and the inlet stage. The cold gas, after threading its way through the cartridges in the pre-cooling stages in heat exchange relationship with the trays, is discharged from the first pre-cooling stage and a portion of the exhausted gas is recirculated in the inlet and outlet stages through the cartridges passing therethrough to create gas curtains serving to isolate the interior of the tunnel from ambient air.

REFERENCES:
patent: 2153742 (1939-04-01), Conn
patent: 2196080 (1940-04-01), Reynoldson
patent: 2774320 (1956-12-01), Kasser
patent: 3238736 (1966-03-01), Macintosh
patent: 3255608 (1966-06-01), Macintosh
patent: 3427820 (1969-02-01), Hart
patent: 3688518 (1972-09-01), Goltsos

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