EP0334678A1 - Meuble d'étalage réfrigéré - Google Patents

Meuble d'étalage réfrigéré Download PDF

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Publication number
EP0334678A1
EP0334678A1 EP89302988A EP89302988A EP0334678A1 EP 0334678 A1 EP0334678 A1 EP 0334678A1 EP 89302988 A EP89302988 A EP 89302988A EP 89302988 A EP89302988 A EP 89302988A EP 0334678 A1 EP0334678 A1 EP 0334678A1
Authority
EP
European Patent Office
Prior art keywords
air
casing
refrigerated display
display cabinet
cabinet according
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Withdrawn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
EP89302988A
Other languages
German (de)
English (en)
Inventor
Roy Prentis
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.)
GEORGE BARKER AND Co (LEEDS) Ltd
Original Assignee
GEORGE BARKER AND Co (LEEDS) Ltd
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
Priority claimed from GB888807211A external-priority patent/GB8807211D0/en
Priority claimed from GB888821883A external-priority patent/GB8821883D0/en
Application filed by GEORGE BARKER AND Co (LEEDS) Ltd filed Critical GEORGE BARKER AND Co (LEEDS) Ltd
Publication of EP0334678A1 publication Critical patent/EP0334678A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • A47F3/0443—Cases or cabinets of the open type with forced air circulation
    • A47F3/0447—Cases or cabinets of the open type with forced air circulation with air curtains

Definitions

  • This invention relates to a refrigerated display cabinet.
  • the invention particularly relates to display cabinets with front access and to the airflow which maintains such display cabinets in a cool or refrigerated condition.
  • the refrigeration system generally employed in such display cabinets comprises a motor-driven compressor, a condenser and an evaporator.
  • the evaporator is traditionally in communication with a cooled chamber in which, for example, foodstuffs are displayed and stored.
  • laminar airflow cabinets were developed largely in the USA, the use of laminar airflow refrigeration cabinets diminished with the US energy crisis when it was found to be essential to incorporate air conditioning within stores to ensure reliable operation.
  • ambient humidities in excess of 55% relative humidity the systems are generally asked to dehumidify more than they can refrigerate, and the evaporators become ice-bound, dramatically reducing their effectiveness.
  • a refrigeration display cabinet having a front access and an air circulation cooling system, said cabinet comprising a casing, refrigeration means including first and second evaporating means, and impelling means for circulating the air, said air circulation having a first and second part, the first part being within the casing, passing the first evaporating means and providing an air curtain for the front access of the cabinet, the second part being outwith the casing and passing the second evaporating means and providing an air curtain between the air curtain of the first part and the ambient air.
  • impelling means for each part of the circulation.
  • the second evaporating means may be activated in response to sensors whch detect the temperature and/or humidity of the ambient environment.
  • air of the first part of the circulation comprises a first and a second circuit, air of the two circuits being circulated in separate channels within the cabinet, only air of the first circuit passing the first evaporating means.
  • the first evaporating means includes two or more evaporators and, most preferably, three evaporators.
  • the evaporator over which the air of the first circuit first passes after entry may have a high primary surface and low secondary surface to provide dehydration duty and the second and third evaporators may comprise staged lowering of primary surface areas with staged increase in secondary surface area to provide refrigeration duty.
  • air of each circuit is discharged as a separate but adjacent air curtain.
  • the air of the first circuit provides an inner air curtain and the air of the second circuit provides an outer insulating air curtain for it.
  • air of the second part of the air circulation passes down the lower front of and underneath the casing and rises in a channel which backs and tops the casing and which includes the second evaporating means; most preferably, the channel terminates in a discharge honeycomb for an air curtain.
  • the channel may be formed by the close apposition of a wall to the rear of the casing, or may be formed by providing a cover to the casing, which cover includes a canopy extension over the top of the casing.
  • the second evaporating means and the impelling means for the second part are positioned at a high level in the channel.
  • a refrigerated display cabinet 1 having an open front access 2 and an air circulation cooling system (shown generally at 3).
  • the cabinet 1 comprises a casing 4 with rear portion 5, trunk area 6 and canopy 7, and a cover 8 for said casing 4, said cover 8 being spaced from the rear portion 5 and canopy 7 so as to form a rear cavity 9 and add height to the canopy 7.
  • the interior of the cabinet contains a plurality of shelf units 16 with perspex dividers 31 and a free standing wire divider 30 positioned on the base tray 14.
  • a number of extended lamps 29 are received by parabolic reflectors 32 which are also provided.
  • the cabinet 1 is constructed to provide two circulations of air, an interior circulation within the casing 4, and an exterior circulation around the outside of the casing 4 but within the cavity 9 of the cover 8, these circulations being represented in the drawing by solid and dashed arrows respectively.
  • the interior circulation has two circuits, a primary and a secondary, represented by single and double arrow-heads respectively.
  • the casing 4 bounds an internal space divided into a display area 10 and channels 11, 12 for air of the first and second circuits respectively; the walls of the first channel 11 bound the display area 10, the walls being in the form of a rear screen 13, base tray 14 and top screen 15.
  • the display area 10 has the open front 2 for access by staff and shoppers to the foodstuffs displayed on the base tray 14 in the trunk area 6 or supported on shelves 16 attached to the rear screen 13.
  • the channels 11, 12 for air of the primary and secondary circuits run parallel to each other within the casing 4, with the channel 11 of the primary circuit being of slightly shorter length and lying innermost to the other.
  • the channels 11, 12 are separated by a dividing wall 17 extending from a position beneath the base tray 14 to run parallel to, and equidistant from, the rear screen 13 of the display area 10 and the back wall of the casing 4, to terminate at the front of the canopy 7.
  • the cabinet 7 also includes the refrigeration means (shown generally at 18) having evaporating means; the evaporating means for refrigeration are located within the first ie the innermost channel 11.
  • Air from both primary and secondary circuits is used to form air curtains 19, 20 across the open front 2 of the casing 4 thus insulating the display area 10.
  • Air of the primary and secondary circuits is circulated largely independent of one another by separate impelling means in the form of fans 21, 22, which draw the air curtains 19, 20 in at a duct 23, and which divide the air between the two channels 11, 12 to recirculate it around the back 5 and canopy 7 area of the casing 4 before discharging the air through discharge honeycombs 24, 241.
  • cooling evaporators 25 of varying design, forming part of the refrigeration means 18, to both dehydrate and refrigerate the airflow in the correct proportion.
  • air drawn along the primary, or innermost,circuit 11 first passes over an evaporator 251 of high primary surface and low secondary surface to provide dehydration duty, thereafter the air rises behind the rear screen 13 to pass over high-level evaporators 252, 253 comprising staged lowering of the primary surface areas with staged increasing of the secondary surface areas to provide refrigeration duty.
  • Air drawn through the secondary, or outer, channel 12 is circulated without interruption from duct 23 to discharge honeycomb 241 and heat gained between these points is removed by passage alongside the chilled inner, or primary, air curtain 19.
  • Air from the exterior circulation is also used to produce an air curtain 26 and the effect of these air curtains 19, 20, 26 is to create a three-layered laminate formation across the open front 2 to limit heat gain and ingress of humid air into the food products within the display area 10, from the ambient air.
  • the number of air curtains required has been found to be in proportional to the temperature difference between conditions required in the display area 10 and the ambient conditions.
  • the primary and secondary circuits' air curtains 19, 20 are sufficient to maintain the low temperature of the foodstuffs.
  • two air curtains are insufficient, and the air curtain 26 of the external part of the air circulation is actuated.
  • the external air circulation is impelled by a fan 27 which is situated at the top of the cabinet 7, between the cover 8 and the casing 4, and which draws-in the chilled spill air at the upper front 22.
  • the air so drawn flows down and under the cabinet and rises up the rear cavity 9 to be expelled through a discharge honeycomb 242 at the front of the cabinet 1, thus forming an insulating curtain 26 to the primary and secondary circuits' air curtains 19, 20.
  • the air of this circulation passes an air conditioning evaporater 28 which is situated adjacent the fan 27 of this circulation and which chills and dehydrates the stream of air; this reduced humidity chilled air then insulates the primary and secondary circuits' air curtains 19, 20 from high ambient temperatures and/or humidities and prevents the icing-up of the primary circuits' evaporators 251, 252, 253.
  • Providing the cabinet 1 with its own air conditioning system allows the cabinet 1 to operate in stores and areas where before total store or total area air conditioning would have been required.
  • cabinets 1 may be required to have the air-conditioning circulation system running continuously, or else it may be more efficient to have only a single air curtain (19 or 20) from the first part of the circulation and the continuously actuated air-conditioning circulation of the second part.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Freezers Or Refrigerated Showcases (AREA)
EP89302988A 1988-03-25 1989-03-28 Meuble d'étalage réfrigéré Withdrawn EP0334678A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB888807211A GB8807211D0 (en) 1988-03-25 1988-03-25 Refrigerated display cabinet
GB8807211 1988-03-25
GB8821883 1988-09-03
GB888821883A GB8821883D0 (en) 1988-09-03 1988-09-03 Refrigerated display cabinet

Publications (1)

Publication Number Publication Date
EP0334678A1 true EP0334678A1 (fr) 1989-09-27

Family

ID=26293692

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89302988A Withdrawn EP0334678A1 (fr) 1988-03-25 1989-03-28 Meuble d'étalage réfrigéré

Country Status (1)

Country Link
EP (1) EP0334678A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994023620A1 (fr) * 1993-04-14 1994-10-27 Northampton Refrigeration Company Limited Armoire de presentation refrigeree et procede de fonctionnement associe
EP0628775A1 (fr) * 1993-06-09 1994-12-14 Linde Aktiengesellschaft Meuble réfrigéré (à basse température)
FR2764052A1 (fr) * 1997-06-03 1998-12-04 Louis Bernet Dispositif diffuseur d'air sec en mur laminaire pour meubles frigorifiques et vitrines de vente
WO2000026589A1 (fr) * 1998-10-30 2000-05-11 Daewoo Electronics Co., Ltd. Refrigerateur pourvu d'un generateur permettant de faire circuler un rideau d'air selon deux vitesses
EP1743552A1 (fr) * 2005-07-12 2007-01-17 Hussmann Corporation Rideau de l'air ambiant avec dispositif d'entrée dans le sol
US8647183B2 (en) 2005-04-25 2014-02-11 Hill Phoenix, Inc. Air curtain system for a refrigerated case
US9526354B2 (en) 2008-09-11 2016-12-27 Hill Phoenix, Inc. Air distribution system for temperature-controlled case

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3287929A (en) * 1965-06-30 1966-11-29 Dual Jet Refrigeration Company Refrigerated cabinet with improved nozzle construction
US3304736A (en) * 1965-08-06 1967-02-21 Emhart Corp Refrigerated display case
DE1501282A1 (de) * 1965-12-13 1969-12-04 Litton Industries Inc Kuehlvitrine
US3756038A (en) * 1972-04-07 1973-09-04 Emhart Corp Refrigerated display equipment
US3812684A (en) * 1972-12-07 1974-05-28 Kysor Industrial Corp Refrigerated display case
US4026121A (en) * 1975-05-20 1977-05-31 Fuji Denki Seizo Kabushiki Kaisha Defrosting in open show case of cold-air-circulation type
DE8524577U1 (de) * 1985-08-28 1986-04-03 TYLER Refrigeration GmbH, 6250 Limburg Klimaregal für Verkaufszwecke

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3287929A (en) * 1965-06-30 1966-11-29 Dual Jet Refrigeration Company Refrigerated cabinet with improved nozzle construction
US3304736A (en) * 1965-08-06 1967-02-21 Emhart Corp Refrigerated display case
DE1501282A1 (de) * 1965-12-13 1969-12-04 Litton Industries Inc Kuehlvitrine
US3756038A (en) * 1972-04-07 1973-09-04 Emhart Corp Refrigerated display equipment
US3812684A (en) * 1972-12-07 1974-05-28 Kysor Industrial Corp Refrigerated display case
US4026121A (en) * 1975-05-20 1977-05-31 Fuji Denki Seizo Kabushiki Kaisha Defrosting in open show case of cold-air-circulation type
DE8524577U1 (de) * 1985-08-28 1986-04-03 TYLER Refrigeration GmbH, 6250 Limburg Klimaregal für Verkaufszwecke

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994023620A1 (fr) * 1993-04-14 1994-10-27 Northampton Refrigeration Company Limited Armoire de presentation refrigeree et procede de fonctionnement associe
EP0628775A1 (fr) * 1993-06-09 1994-12-14 Linde Aktiengesellschaft Meuble réfrigéré (à basse température)
FR2764052A1 (fr) * 1997-06-03 1998-12-04 Louis Bernet Dispositif diffuseur d'air sec en mur laminaire pour meubles frigorifiques et vitrines de vente
WO2000026589A1 (fr) * 1998-10-30 2000-05-11 Daewoo Electronics Co., Ltd. Refrigerateur pourvu d'un generateur permettant de faire circuler un rideau d'air selon deux vitesses
US6094931A (en) * 1998-10-30 2000-08-01 Daewoo Electronics Co., Ltd. Refrigerator having dual air velocity generating apparatus for air curtain flow
US8647183B2 (en) 2005-04-25 2014-02-11 Hill Phoenix, Inc. Air curtain system for a refrigerated case
EP1743552A1 (fr) * 2005-07-12 2007-01-17 Hussmann Corporation Rideau de l'air ambiant avec dispositif d'entrée dans le sol
US9526354B2 (en) 2008-09-11 2016-12-27 Hill Phoenix, Inc. Air distribution system for temperature-controlled case

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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