EP0444668A2 - Récipient frigorifique - Google Patents

Récipient frigorifique Download PDF

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Publication number
EP0444668A2
EP0444668A2 EP91103010A EP91103010A EP0444668A2 EP 0444668 A2 EP0444668 A2 EP 0444668A2 EP 91103010 A EP91103010 A EP 91103010A EP 91103010 A EP91103010 A EP 91103010A EP 0444668 A2 EP0444668 A2 EP 0444668A2
Authority
EP
European Patent Office
Prior art keywords
cooling
chamber
refrigerant
housing
inner container
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91103010A
Other languages
German (de)
English (en)
Other versions
EP0444668A3 (en
Inventor
Norbert Utz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0444668A2 publication Critical patent/EP0444668A2/fr
Publication of EP0444668A3 publication Critical patent/EP0444668A3/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
    • F25D3/12—Devices using other cold materials; Devices using cold-storage bodies using solidified gases, e.g. carbon-dioxide snow
    • F25D3/125—Movable containers
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
    • A47F3/00—Show cases or show cabinets
    • A47F3/04—Show cases or show cabinets air-conditioned, refrigerated
    • A47F3/0439—Cases or cabinets of the open type

Definitions

  • the invention relates to a refrigerated container with a refrigerated goods chamber in a heat-insulating housing, a refrigerant chamber for a refrigerant, preferably dry ice, arranged separately from the refrigerated goods chamber in the housing, and a conduit system for gaseous cooling medium that starts from and returns to the refrigerant chamber.
  • DE-OS 38 17 871 describes a cooling container of this type which allows the refrigerated goods to be stored cool for at least a certain time even when there is no mains voltage connection available for an electrical cooling unit.
  • the separate storage of the refrigerated goods and the refrigerant makes it possible to maintain a temperature in the refrigerated goods chamber that is significantly higher than the very low evaporation temperature of the dry ice.
  • the carbon dioxide formed by evaporation of the dry ice is blown into the refrigerated goods chamber with the aid of a fan, and the heated air from the refrigerated goods chamber is returned to the refrigerant chamber via an exhaust air line.
  • the fan can be controlled by a termostat so that the temperature of the goods to be cooled is kept within narrow limits, for example between 0 ° and + 3 ° C.
  • the chambers for the refrigerated goods and the refrigerant formed in the heat-insulating housing are separated from one another by a vertical partition made of heat-insulating material and covered by a common cover.
  • the line system, the fan and the associated control devices are arranged in the cover. If a sufficient cooling effect is to be ensured in this known container, the lid may only be opened for a short time in order to store or remove refrigerated goods.
  • the invention has for its object to provide a cooling container that can be used as a long-term open sales container for ice cream or other frozen goods and at which the prescribed maximum temperature for the refrigerated goods can be maintained without a network or vehicle-dependent cooling unit.
  • a cooling container of the type mentioned at the outset in that the refrigerated goods chamber is formed by an inner container which is open at the top and which has side walls made of a heat-conducting material, and in that the conduit system has at least one through a cavity between a side wall of the inner container and the insulating material of the housing formed cooling channel.
  • the carbon dioxide formed by evaporation of the dry ice thus flows past the actual refrigerated goods chamber in the cooling channel on the outside, and the cooling takes place essentially by heat conduction in the side walls of the inner container.
  • a stable air stratification results in the interior of the refrigerated goods chamber, so that cold losses due to the penetration of warm air are largely avoided even when the lid is open.
  • the gas returned to the refrigerant chamber is pure carbon dioxide without admixtures of air, so that a high CO2 partial pressure is maintained in the refrigerant circuit and excessive evaporation of the dry ice is avoided.
  • cooling channels are formed by cavities in the heat-insulating material of the housing and are limited on one side by the walls of the inner container, simple manufacture is made possible.
  • the flow resistance of the line system is independent of the filling state of the refrigerated goods chamber and can be kept very low by a suitable choice of the cross section of the cooling channels, so that only an extremely low drive power is required to circulate the cooling medium.
  • the cooling medium is preferably circulated with fans arranged in the cooling channels, so that a simple and precise regulation of the temperature in the refrigerated goods chamber is made possible by appropriate control of the fans.
  • the fans have only a relatively low power consumption and can be powered, for example, by solar cells.
  • the cooling channels and the refrigerant chamber can also be arranged so that the circulation of the cooling medium is maintained or at least supported by convection.
  • the side walls of the inner container are advantageously provided with openings through which part of the cooling medium (CO2) can enter the refrigerated goods chamber.
  • CO2 cooling medium
  • the carbon dioxide entering the refrigerated goods chamber through the openings is specifically denser than air of the same temperature and therefore displaces the air from the refrigerated goods chamber. In this way, an even more stable stratification of the atmosphere in the refrigerated goods chamber is achieved.
  • Another advantage is that the refrigerated goods are stored in an oxygen-free atmosphere and are therefore better kept fresh.
  • a cooling container 10 has a trough-shaped housing 12 made of a heat-insulating material, for example polystyrene or PU, in the upper opening of which a trough-shaped inner container 14, for example made of stainless steel, is suspended.
  • the inside of the inner container 14 forms a refrigerated goods chamber 16.
  • a refrigerant chamber 18 which, according to FIG. 2, is delimited by a double-tubular component 20 inserted into the housing 12 and open at both ends and divided into two longitudinal compartments 22, 24 .
  • the compartments 22, 24 of the refrigerant chamber each contain a pull-out grate 26 and can be filled with dry ice via two doors 28 arranged in an end wall of the housing 12. In this way, a total of up to 60 kg of dry ice can be accommodated in the refrigerant chamber 18.
  • the refrigerated goods chamber 16 is insulated from the refrigerant chamber 18 by an inserted intermediate floor 30.
  • Cooling channels 32, 34 are formed in the end and side walls of the insulating housing 12, each of which is connected to one of the compartments 22, 24 of the refrigerant chamber.
  • the cooling channels 32 run approximately vertically in the end walls of the housing 12 and are delimited on the inside by the end walls of the inner container 14. As can be seen in FIG. 2, the cooling channels 32 diverge upwards in a V-shape, so that a connection to the cooling channels 34 running along the side walls of the inner container 14 is created.
  • two separate refrigerant circuits are formed, each of which includes one of the compartments 22, 24 of the refrigerant chamber, two of the vertical cooling channels 32 and one of the longitudinal cooling channels 34.
  • Fans 36 are provided in the cooling channels 34, with which the gaseous carbon dioxide formed by evaporation of the dry ice in the refrigerant chamber 18 is circulated in the two refrigerant circuits in opposite directions.
  • the cooling channels 32 which each form the ascending branch of the refrigerant circuit in question, are insulated in the lower region by an insulating plate 38 from the end wall of the inner container 14.
  • the very cold carbon dioxide emerging from the refrigerant chamber 18 therefore only comes into thermal contact with the walls of the inner container 14 in the upper region thereof, so that a low temperature gradient results in the interior of the refrigerated goods chamber 16 in the vertical direction. Because the ascending branches of the two refrigerant circuits, in which the cold carbon dioxide is supplied, diagonally opposite, a largely uniform temperature distribution over the floor plan of the refrigerated goods chamber is also achieved.
  • the cooling channels 34 have an upright rectangular profile, so that there is a large heat transfer area to the refrigerated goods chamber 16. Only at the points where the fans 36 are located are the cooling channels 34 bulged somewhat, as can be seen in FIG. 3.
  • the fan housing need not be flush with the cross section of the cooling channels 34, because there is practically no pressure drop in the refrigerant circuit, so that there is no backflow of the gas above and below the fan housing.
  • the cooling channels 32, 34 have a relatively large cross-section and smooth walls rounded with curvatures, so that there is only a slight flow resistance and turbulence in the gas is avoided. A low-resistance laminar flow is generated in the cooling channels by the fans 36.
  • the walls of the inner container 14 are provided at the level of the upper region of the cooling channels 34 with openings 40 through which carbon dioxide can enter the interior of the refrigerated goods chamber 16.
  • the openings 40 serve to relieve the pressure in the refrigerant circuits and produce a relatively stable cooling bath made of carbon dioxide in the interior of the refrigerated goods chamber 16, which is only slightly disturbed even by air movements in the region of the opening of the refrigerated goods chamber.
  • the temperature in the interior of the refrigerated goods chamber 16 is measured with the aid of one or more temperature sensors, not shown, and regulated to a constant value, for example to ⁇ 18 ° C., by correspondingly controlling the fans 36. Further temperature sensors, not shown, record the flow temperature of the carbon dioxide in the ascending branches of the two Coolant circuits and generate an alarm signal when the surface of the carbon dioxide in the refrigerant chamber 18 decreases as the evaporation progresses and as a result the flow temperature rises above a certain value. With a complete dry ice filling of the refrigerant chamber 18, the target temperature of -18 ° C. in the approximately 160 l refrigerated goods chamber 16 can be maintained for at least forty-eight hours even in summer outside temperatures.
  • the cooling container 10 is therefore particularly suitable as a sales stand or trolley for ice cream.
  • the ice can, for example, be brought directly to the consumer in pedestrian zones, on the beach or the like, and because of the independence of the cooling system from an external energy supply, relocations are possible without any problems. Nevertheless, reliable cooling of the ice cream is guaranteed over a long period of time so that the prescribed maximum temperature is not exceeded.
  • FIG. 2 14 holding strips 42 are attached to the inner walls of the inner container, which serve to hold ice cream boxes and at the same time act as cooling fins.
  • the upper edge of the inner container 14 is surrounded by a cover 44 which, in order to reduce the heat conduction, either consists entirely of plastic or adjoins the inner container 14 via a plastic intermediate piece.
  • the side walls of the housing 12 in the area of the cooling channels 34 must have a relatively large wall thickness, so that adequate insulation is also ensured there.
  • cavities are formed in the side walls of the housing 12 outside the insulation, which serve to accommodate tanks 46 for water for cleaning the ice cream portioner.
  • wheel housing 48 for detachably attached wheels 50 are embedded in the side walls.
  • a holding rail 52 is attached, which is used to fasten a trim plate 54 and to fasten the wheel hub.
  • the wheel hubs are held on steel tubes 56 running under the bottom of the housing 12.
  • the steel tubes 56 also serve for the detachable fastening of additional equipment, for example a pedestal, a sunroof and the like. When the wheels 50 and the base are removed, the steel tubes 56 serve as skid-like feet of the housing 12.
  • the attachment of the wheels, the feet and other supporting parts to the steel tubes 56 has the advantage that the housing 12 itself does not have to perform a supporting function and can simply be produced from relatively light, heat-insulating material which is only externally covered by thin cladding panels.
  • the inner container 14, the intermediate floor 30 and the double tubular part 20 can be removed from the housing 12, so that the heat-insulating housing can also be used for other purposes during the cold season, for example as a sales stand for hot sausages, mulled wine and the like.
  • the cladding panels 54 attached to the outside of the housing 12 are preferably held in interchangeable frames, not shown, so that they can be exchanged for cladding panels with a different label when converting to a different purpose.
EP19910103010 1990-02-28 1991-02-28 Refrigerated container Withdrawn EP0444668A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4006272 1990-02-28
DE19904006272 DE4006272A1 (de) 1990-02-28 1990-02-28 Kuehlbehaelter

Publications (2)

Publication Number Publication Date
EP0444668A2 true EP0444668A2 (fr) 1991-09-04
EP0444668A3 EP0444668A3 (en) 1992-05-27

Family

ID=6401128

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910103010 Withdrawn EP0444668A3 (en) 1990-02-28 1991-02-28 Refrigerated container

Country Status (2)

Country Link
EP (1) EP0444668A3 (fr)
DE (1) DE4006272A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6836622B2 (en) 2000-06-30 2004-12-28 Mitsubishi Denki Kabushiki Kaisha Optical transmitter, and method of controlling bias voltage to the optical transmitter
NL1025799C2 (nl) * 2004-03-24 2005-09-27 Fri Jado Bv Koelinrichting met milieuvriendelijke koelmedia.
WO2011006721A2 (fr) * 2009-07-17 2011-01-20 Unilever Plc Procédé de présentation et de vente de produits comestibles congelés
EP3671076A1 (fr) * 2018-12-21 2020-06-24 Vakava Technologies Ltd Oy Stockage de marchandises à régulation de température
CN112690610A (zh) * 2020-12-17 2021-04-23 曾强 一种展示用保鲜设备

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19644505C2 (de) * 1996-10-25 1999-08-19 Fink Karl Eisfink Anlage zum Kühlhalten von Lebensmitteln
DE10310919B4 (de) 2003-03-13 2008-08-14 Guido Schmitz Kühleinrichtung zum Lagern und Präsentieren von Speiseeis

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1822851A (en) * 1930-03-25 1931-09-08 Dryice Equipment Corp Refrigerating apparatus and method
US1880735A (en) * 1929-07-17 1932-10-04 James H Bell Refrigerator
US1914349A (en) * 1929-10-24 1933-06-13 James H Bell Refrigerator
US4399662A (en) * 1980-05-01 1983-08-23 Tyler Refrigeration Corporation Island refrigerated display case with air defrost

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE827654C (de) * 1950-05-28 1952-03-24 Wilhelm Siller Dr Verfahren zum Kuehlhalten von insbesondere Lebensmitteln in truhenfoermig ausgebildeten Kuehlbehaeltern mittels Trockeneis
DE1501316A1 (de) * 1966-03-03 1969-10-30 Siemens Ag Elektromotorisch angetriebene Luefteranordnung in Fahrzeugen
DE2227313C2 (de) * 1972-06-05 1984-03-08 Kohlensäure-Werke Rudolf Buse Sohn GmbH & Co, 5462 Bad Hönningen Kühlcontainer zum Frisch- und Kühlhalten von Nahrungsmitteln
DE2322765A1 (de) * 1973-05-05 1974-11-21 Langnese Iglo Gmbh Tiefkuehlverkaufstruhe
DE3817871A1 (de) * 1988-05-26 1989-12-07 Holzer Walter Temperaturgeregelte kuehlbox

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1880735A (en) * 1929-07-17 1932-10-04 James H Bell Refrigerator
US1914349A (en) * 1929-10-24 1933-06-13 James H Bell Refrigerator
US1822851A (en) * 1930-03-25 1931-09-08 Dryice Equipment Corp Refrigerating apparatus and method
US4399662A (en) * 1980-05-01 1983-08-23 Tyler Refrigeration Corporation Island refrigerated display case with air defrost

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6836622B2 (en) 2000-06-30 2004-12-28 Mitsubishi Denki Kabushiki Kaisha Optical transmitter, and method of controlling bias voltage to the optical transmitter
NL1025799C2 (nl) * 2004-03-24 2005-09-27 Fri Jado Bv Koelinrichting met milieuvriendelijke koelmedia.
WO2011006721A2 (fr) * 2009-07-17 2011-01-20 Unilever Plc Procédé de présentation et de vente de produits comestibles congelés
WO2011006721A3 (fr) * 2009-07-17 2011-04-21 Unilever Plc Procédé de présentation et de vente de produits comestibles congelés
EP3671076A1 (fr) * 2018-12-21 2020-06-24 Vakava Technologies Ltd Oy Stockage de marchandises à régulation de température
CN112690610A (zh) * 2020-12-17 2021-04-23 曾强 一种展示用保鲜设备

Also Published As

Publication number Publication date
DE4006272A1 (de) 1991-09-05
EP0444668A3 (en) 1992-05-27

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