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1. (EP0527856) FOOD FREEZER

Office : European Patent Office
Application Number: 91909134 Application Date: 06.05.1991
Publication Number: 0527856 Publication Date: 24.02.1993
Publication Kind : A4
Designated States: DE, DK, FR, GB, IT, SE
Prior PCT appl.: Application Number:US1991003095 ; Publication Number: Click to see the data
IPC:
F 25D
F25B 9/00
A23L 3/36
F25B 7/00
F25B 41/00
F25D 13/06
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25
REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION OR SOLIDIFICATION OF GASES
D
REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT COVERED BY ANY OTHER SUBCLASS
17
Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
02
for circulating liquids, e.g. brine
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25
REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION OR SOLIDIFICATION OF GASES
B
REFRIGERATION MACHINES, PLANTS, OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
9
Compression machines, plant, or systems, in which the refrigerant is air or other gas of low boiling point
A HUMAN NECESSITIES
23
FOODS OR FOODSTUFFS; THEIR TREATMENT, NOT COVERED BY OTHER CLASSES
L
FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D91; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
3
Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
36
Freezing; Subsequent thawing; Cooling
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25
REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION OR SOLIDIFICATION OF GASES
B
REFRIGERATION MACHINES, PLANTS, OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
7
Compression machines, plant, or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25
REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION OR SOLIDIFICATION OF GASES
B
REFRIGERATION MACHINES, PLANTS, OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
41
Fluid-circulation arrangements, e.g. for transferring liquid from evaporator to boiler
F MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
25
REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION OR SOLIDIFICATION OF GASES
D
REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT COVERED BY ANY OTHER SUBCLASS
13
Stationary devices associated with refrigerating machinery, e.g. cold rooms
06
with conveyers carrying articles to be cooled through the cooling space
CPC:
F25B 41/00
A23L 3/361
A23L 3/362
B65G 2207/24
F25B 7/00
F25B 9/008
F25B 2309/06
F25D 13/06
Applicants: LIQUID CARBONIC CORP
Inventors: GYGER ROGER FREDERICK
LANG GARY DEE
BURGERS KENNETH LEROY
Priority Data: 07520773 08.05.1990 US
Title: (DE) LEBENSMITTELGEFRIERANLAGE.
(EN) FOOD FREEZER
(FR) CONGELATEUR POUR ALIMENTS.
Abstract:
(EN) A food freezer (10) having a mechanical refrigeration system (54) comprising first (56) and second (58) closed-loop fluid circuits, wherein the first fluid circuit (56) employs carbon dioxide as its refrigerant and transfers heat to the second fluid circuit (58), which in turn transfers heat to the environment or to another fluid circuit. In the first fluid circuit evaporator (60), carbon dioxide is maintained at pressures between 60.4 psig and 120 psig. In a preferred embodiment of the invention, the freezer (10) employs at least two separate blowers (44), (86) or fans for circulation of air or other gas in the freezer enclosure. One blower/fan (44) operates continuously to maintain circulation of cold air or gas in the freezer (10). The other blower/fan (86) operates intermittently or at variable speeds to vary air flow across the evaporator (60), and thereby increase or decrease heat transfer from the freezer (10) interior to the first fluid circuit evaporator (60) to maintain the freezer (10) interior at a desired temperature or within a desired temperature range.
(FR) Congélateur pour aliments (10) comportant un système de réfrigération mécanique (54) comprenant des premier (56) et second (58) circuits de fluide à boucle fermée, dans lequel le premier circuit de fluide (56) emploie du dioxyde de carbone comme réfrigérant et transfère de la chaleur au second circuit de fluide (58), lequel à son tour transfère de la chaleur à l'environnement ou à un autre circuit de fluide. Dans l'évaporateur (60) du premier circuit de fluide, du dioxyde de carbone est maintenu à des pressions comprises entre 60,4 psig et 120 psig. Selon un mode de réalisation préféré de l'invention, le congélateur (10) emploie au moins deux soufflantes séparées (40), (86) ou des ventilateurs assurant la circulation d'air ou d'un autre gaz dans l'enceinte du congélateur. Une soufflante/un ventilateur (44) fonctionne de manière continue afin de maintenir une circulation d'air ou de gaz froid dans le congélateur (10). L'autre soufflante/ventilateur (46) fonctionne par intermittence à des vitesses variables afin de varier l'écoulement d'air dans l'évaporateur (60), et ainsi d'augmenter ou de diminuer le transfert de chaleur de l'intérieur du congélateur (10) dans l'évaporateur (60) du premier circuit de fluide, de manière à maintenir l'intérieur du congélateur (10) à une température voulue ou dans une plage de températures désirée.
Also published as:
CA2080588AU1991077952WO/1991/017400