Cryogenic method and apparatus for quick freezing

1,099,470. Refrigerators. CHEMETRON CORPORATION. May 26, 1965 [Oct. 27, 1964], No. 22421/65. Heading F4H. In a process for freezing a continuously moving product, a current of gaseous refrigerant is passed in heat transfer relation with liquid refrigerant to evaporate the latter, the thus evaporated...

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Bibliographische Detailangaben
1. Verfasser:	RICH HAROLD M
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CHEMICAL RIPENING OF FRUIT OR VEGETABLES COLD ROOMS COMBINED HEATING AND REFRIGERATION SYSTEMS COOLING OR FREEZING APPARATUS NOT COVERED BY ANY OTHERSUBCLASS FOODS OR FOODSTUFFS FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BYSUBCLASSES A23B - A23J HEAT EXCHANGE IN GENERAL HEAT PUMP SYSTEMS HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS,IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACTWITHOUT CHEMICAL INTERACTION HEATING HUMAN NECESSITIES ICE-BOXES LIGHTING LIQUEFACTION SOLIDIFICATION OF GASES MANUFACTURE OR STORAGE OF ICE MECHANICAL ENGINEERING PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT,VEGETABLES, EDIBLE SEEDS REFRIGERATION OR COOLING REFRIGERATORS THE PRESERVED, RIPENED, OR CANNED PRODUCTS THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OFNUTRITIVE QUALITIES, PHYSICAL TREATMENT THEIR TREATMENT, NOT COVERED BY OTHER CLASSES WEAPONS
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Zusammenfassung:	1,099,470. Refrigerators. CHEMETRON CORPORATION. May 26, 1965 [Oct. 27, 1964], No. 22421/65. Heading F4H. In a process for freezing a continuously moving product, a current of gaseous refrigerant is passed in heat transfer relation with liquid refrigerant to evaporate the latter, the thus evaporated refrigerant is mixed with the gaseous current and the combined stream is circulated over the product then re-cycled as said gaseous current. As shown, products on a perforate conveyer 22 are moved through a freezing tunnel having sections 10a, 10b and 10c, the section 10a housing a fixed cooling coil 40 which is supplied with liquid nitrogen by conduit 35 and has an open end 45a. A fan 50 circulates gaseous nitrogen over coil 40 and the evaporated nitrogen issuing from end 45a is combined with said gaseous nitrogen, the mixed stream being supplied to a plenum chamber 51. Cold gaseous nitrogen is discharged from the latter through downwardly directed nozzles 55 (Fig. 3, not shown) at speeds of up to 6000 or 7000 feet per minute. The build-up of pressure in section 10a causes gaseous nitrogen to flow up- and downstream of the conveyer through openings 18 and 19 respectively to the other sections in which the nitrogen is circulated by fan, plenum chamber and nozzle means similar to those in section 10a but without the cooling coil. The supply of liquid nitrogen to coil 40 is regulated by a valve 36 (Fig. 4, not shown) which is controlled by a device 42 responsive to the liquid level in coil 40 and by a device 49 responsive to the temperature in section 10a. The conveyer 22 may be imperforate or have a removable imperforate cover for use in freezing liquid products, additional upwardly discharging nozzles may be provided beneath the conveyer and the conveyer may be replaced by a fixed grid through which the gaseous nitrogen is forced upwardly and at an angle to fluidise and convey the product. Coil 40 may be replaced by means for spraying liquid nitrogen into the recirculating gaseous current. The product leaving the apparatus may be dried by allowing ice in the product to sublimate under vacuum.