EP0403459A1 - Refrigerated display cabinet - Google Patents
Refrigerated display cabinet Download PDFInfo
- Publication number
- EP0403459A1 EP0403459A1 EP90850232A EP90850232A EP0403459A1 EP 0403459 A1 EP0403459 A1 EP 0403459A1 EP 90850232 A EP90850232 A EP 90850232A EP 90850232 A EP90850232 A EP 90850232A EP 0403459 A1 EP0403459 A1 EP 0403459A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- shelves
- goods
- rear wall
- place
- 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.)
- Granted
Links
Images
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
-
- 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
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/04—Preventing the formation of frost or condensate
Definitions
- the invention refers to a refrigerated display cabinet showing a substantially vertical rear wall, a plurality of shelves for goods arranged above each other along the wall, a first air duct extending from a first place at the front edge of the lowest shelf, in substantially horizontal direction under the lowest shelf, in substantially vertical direction behind the rear wall and in substantially horizontal direction above the uppermost shelf to a second place above the front edge of the uppermost shelf, a fan to circulate air through the duct to the second place, from where the air moves downwards in an air curtain in front of the front edges of the shelves to the first place, a refrigerating apparatus to cool the air circulating through the duct to freezing temperature, and openings in the rear wall to bring about air flows from the duct through the spaces formed between the shelves.
- the object of the invention is to bring about a temperature of all the goods in such a refrigerated display cabinet, which temperature is as close as possible to the freezing-point of the goods without the goods becoming frozen. For meat this freezing-point is about -2° C.
- This object is attained in the refrigerated display cabinet according to the invention by means for heating said air flows so that the goods on the shelves does not freeze. By the means to heat the air flows, which have freezing temperature when they enter the spaces between the shelves from the duct, the goods at the rear wall is prevented from freezing.
- the goods at the front edge of the shelves which goods is exposed to heat radiation from the surroundings in front of the cabinet and to an air flow which has been heated by the goods on its passage through the spaces between the shelves, is prevented from becoming too warm by the air curtain which has freezing temperature when it leaves the duct.
- the temperature of the air curtain will increase during its movement in direction downwards, goods at the front edge of shelves located at a lower level thereby becoming warmer than goods at the front edge of shelves located at a higher level.
- goods at the front edge of shelves located at a lower level is prevented from becoming too warm by means to cause greater air flows through spaces located at a lower level than through spaces located at a higher level.
- the means to heat the air flows is constituted of an electric heating cable arranged in the rear wall and heating a metal sheet forming the inner wall surface of the cabinet.
- the means to heat the air flows is in addition constituted of electric fluorescent tubes arranged in the spaces and simultaneously illuminating the goods, means being arranged to activate the fluorescent tubes in the daytime and the heating cable in the night.
- Fig. 1 shows a vertical sectioned view of the cabinet
- Fig. 2 shows a sectional view according to the marking II - II in Fig. 1.
- 10 is designated a refrigerated display cabinet showing a plurality of heat insulating shelves 12, 14, 16 and 18 for offering goods which is available through an opening 22 of the cabinet.
- the three upper shelves 14, 16 and 18 are fastened to a rear wall 24 constituted of a metal sheet 26 and a heat insulating sheet 28 located behind the metal sheet.
- An electrically heatable cable 30 is located between the sheets 26 and 28, the cable 30 heating the sheet 26.
- a horizontal heat insulating sheet 32 is connected to the upper end of the sheet 28.
- the shelf 12, the sheet 28 and the sheet 32 are surrounded by a heat insulating intermediate wall 34 with an intermediate air duct 36 extending from a place 38 at the lower front end of the cabinet to a place 40 at the upper end of the cabinet.
- the intermediate wall 34 is in its turn surrounded by an outer wall 42 with an intermediate air duct 44 extending from a place 46 at the lower front end of the cabinet to a place 48 at the upper front end of the cabinet.
- a fan 50 is arranged to circulate air through the duct 36 from the place 38 to the place 40, from where the air moves in a curtain 52 in front of the front edges of the shelves downwards to the place 38.
- a fan 54 is arranged to circulate uncooled air through the duct 44 from the place 46 to the place 48, from where the air moves in a curtain 56 outside the curtain 52 downwards to the place 46.
- the air in the duct 36 is cooled by a refrigerating apparatus 58 cooling the air to freezing temperature, i.e. to a temperature below the temperature at which the goods freezes. The air still has freezing temperature when it passes the place 40. Measured air and goods temperatures in different places of the cabinet are noted directly in the figure. Openings 60 are arranged in the rear wall 24 to let air of freezing temperature into the spaces 62, 64 and 66 between the four lowest shelves 12, 14, 16 and 18.
- the openings 60 are such, that the air flow becomes greatest through the space 62, smaller through the space 64 and smallest through the space 66.
- the sheet 26 heats the air flows when they enter the spaces 62, 64 and 66, so that the goods adjacent to the wall 24 does not freeze.
- the air flows can also be heated by electrical fluorescent tubes 68 simultaneously illuminating the goods.
- the tubes 68 are located so close to the wall 26 that the goods adjacent to this wall does not freeze.
- a timer 70 can be provided to activate the heating cable 30 in the night via electric wires 72 and activate the tubes 68 in the daytime via electric wires 74, so that the air flows in the night are heated solely by the heating cable and in the daytime solely by the fluorescent tubes.
- the heating of the air flows through the spaces 62, 64 and 66 can alternatively by achieved by arranging ducts to conduct air of ambient temperature through the wall 24.
- the uncooled air curtain 56 which is located outside the cold air curtain 52, protects the cold air curtain from being mixed with ambient air.
- the curtains 52 and 56 are formed by guide vanes or so-called honeycomb cells 76, the object of which being to bring about a laminar flow in the curtains, this also in order to decrease the mixing-in of ambient air into the curtains.
- honeycomb cells and air curtain arrangements are known per se through e.g. U.S. patent No. 3,256,799.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Freezers Or Refrigerated Showcases (AREA)
Abstract
Description
- The invention refers to a refrigerated display cabinet showing a substantially vertical rear wall, a plurality of shelves for goods arranged above each other along the wall, a first air duct extending from a first place at the front edge of the lowest shelf, in substantially horizontal direction under the lowest shelf, in substantially vertical direction behind the rear wall and in substantially horizontal direction above the uppermost shelf to a second place above the front edge of the uppermost shelf, a fan to circulate air through the duct to the second place, from where the air moves downwards in an air curtain in front of the front edges of the shelves to the first place, a refrigerating apparatus to cool the air circulating through the duct to freezing temperature, and openings in the rear wall to bring about air flows from the duct through the spaces formed between the shelves. The object of the invention is to bring about a temperature of all the goods in such a refrigerated display cabinet, which temperature is as close as possible to the freezing-point of the goods without the goods becoming frozen. For meat this freezing-point is about -2° C. This object is attained in the refrigerated display cabinet according to the invention by means for heating said air flows so that the goods on the shelves does not freeze. By the means to heat the air flows, which have freezing temperature when they enter the spaces between the shelves from the duct, the goods at the rear wall is prevented from freezing. The goods at the front edge of the shelves, which goods is exposed to heat radiation from the surroundings in front of the cabinet and to an air flow which has been heated by the goods on its passage through the spaces between the shelves, is prevented from becoming too warm by the air curtain which has freezing temperature when it leaves the duct. As a consequence of heat absorption from the goods the temperature of the air curtain will increase during its movement in direction downwards, goods at the front edge of shelves located at a lower level thereby becoming warmer than goods at the front edge of shelves located at a higher level. According to a further development of the invention goods at the front edge of shelves located at a lower level is prevented from becoming too warm by means to cause greater air flows through spaces located at a lower level than through spaces located at a higher level. According to another development of the invention the means to heat the air flows is constituted of an electric heating cable arranged in the rear wall and heating a metal sheet forming the inner wall surface of the cabinet. By this a simple device to heat the air flows is obtained. According to a further development of the invention the means to heat the air flows is in addition constituted of electric fluorescent tubes arranged in the spaces and simultaneously illuminating the goods, means being arranged to activate the fluorescent tubes in the daytime and the heating cable in the night. By this one obtains in the daytime illumination of the goods and heating of the air flows simultaneously by the same means, i.e. by the fluorescent tubes. In the night, the heating cable heats the air flows instead of the fluorescent tubes. An embodiment of a refrigerated display cabinet according to the invention will be described below with reference to the attached drawings, where Fig. 1 shows a vertical sectioned view of the cabinet and Fig. 2 shows a sectional view according to the marking II - II in Fig. 1. By 10 is designated a refrigerated display cabinet showing a plurality of
heat insulating shelves upper shelves rear wall 24 constituted of ametal sheet 26 and aheat insulating sheet 28 located behind the metal sheet. An electricallyheatable cable 30 is located between thesheets cable 30 heating thesheet 26. A horizontalheat insulating sheet 32 is connected to the upper end of thesheet 28. Theshelf 12, thesheet 28 and thesheet 32 are surrounded by a heat insulatingintermediate wall 34 with anintermediate air duct 36 extending from aplace 38 at the lower front end of the cabinet to aplace 40 at the upper end of the cabinet. Theintermediate wall 34 is in its turn surrounded by anouter wall 42 with anintermediate air duct 44 extending from aplace 46 at the lower front end of the cabinet to aplace 48 at the upper front end of the cabinet. A fan 50 is arranged to circulate air through theduct 36 from theplace 38 to theplace 40, from where the air moves in acurtain 52 in front of the front edges of the shelves downwards to theplace 38. Afan 54 is arranged to circulate uncooled air through theduct 44 from theplace 46 to theplace 48, from where the air moves in acurtain 56 outside thecurtain 52 downwards to theplace 46. The air in theduct 36 is cooled by a refrigerating apparatus 58 cooling the air to freezing temperature, i.e. to a temperature below the temperature at which the goods freezes. The air still has freezing temperature when it passes theplace 40. Measured air and goods temperatures in different places of the cabinet are noted directly in the figure.Openings 60 are arranged in therear wall 24 to let air of freezing temperature into thespaces lowest shelves openings 60 are such, that the air flow becomes greatest through the space 62, smaller through thespace 64 and smallest through thespace 66. Thesheet 26 heats the air flows when they enter thespaces wall 24 does not freeze. With asheet 26 of the height of 1,4 metres between thesheet 32 and theshelf 12 and a width of 2,7 metres (= the inner width of the cabinet), the even temperature distribution in the goods has according to the invention been obtained at a power of theheating cable 30 of totally 170 watt. The air flows can also be heated by electricalfluorescent tubes 68 simultaneously illuminating the goods. Thetubes 68 are located so close to thewall 26 that the goods adjacent to this wall does not freeze. Atimer 70 can be provided to activate theheating cable 30 in the night viaelectric wires 72 and activate thetubes 68 in the daytime viaelectric wires 74, so that the air flows in the night are heated solely by the heating cable and in the daytime solely by the fluorescent tubes. The heating of the air flows through thespaces wall 24. Theuncooled air curtain 56, which is located outside thecold air curtain 52, protects the cold air curtain from being mixed with ambient air. Thecurtains honeycomb cells 76, the object of which being to bring about a laminar flow in the curtains, this also in order to decrease the mixing-in of ambient air into the curtains. Such honeycomb cells and air curtain arrangements are known per se through e.g. U.S. patent No. 3,256,799.
Claims (4)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8902104 | 1989-06-12 | ||
SE8902104A SE462826B (en) | 1989-06-12 | 1989-06-12 | REFRIGERATED DISPLAY COUNTER |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0403459A1 true EP0403459A1 (en) | 1990-12-19 |
EP0403459B1 EP0403459B1 (en) | 1993-10-20 |
Family
ID=20376247
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90850232A Expired - Lifetime EP0403459B1 (en) | 1989-06-12 | 1990-06-12 | Refrigerated display cabinet |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0403459B1 (en) |
DE (1) | DE69004010T2 (en) |
DK (1) | DK0403459T3 (en) |
FI (1) | FI88575C (en) |
SE (1) | SE462826B (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0709046A3 (en) * | 1994-10-24 | 1999-05-19 | Sanyo Electric Co. Ltd | Open showcase |
GB2336656A (en) * | 1998-04-23 | 1999-10-27 | Halton Oy | Refrigerated display case |
WO2000033707A1 (en) | 1998-12-09 | 2000-06-15 | Nevoret-Concept | Open display case |
EP1460358A1 (en) * | 2001-12-27 | 2004-09-22 | Gac Corporation | Storage device |
CN100350203C (en) * | 2004-07-30 | 2007-11-21 | 上海海立中野冷机有限公司 | Open type vertical refrigerated cabinet |
WO2011074993A1 (en) * | 2009-12-17 | 2011-06-23 | Jbg-2 Sp. Z O.O. | A set of refrigerated display cases |
WO2020109808A1 (en) * | 2018-11-29 | 2020-06-04 | Aerofoil Energy Limited | Refrigerators |
WO2020229832A1 (en) * | 2019-05-16 | 2020-11-19 | Aerofoil Energy Limited | Refrigerators |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4341089A (en) * | 1978-02-10 | 1982-07-27 | Tyler Refrigeration Corporation | Self heating refrigerator |
DE3113571A1 (en) * | 1981-04-03 | 1982-11-11 | Linde Ag, 6200 Wiesbaden | Refrigerated shelf unit |
AT380330B (en) * | 1982-08-03 | 1986-05-12 | May Herbert | CLIMATE CABINET FOR HEATING REFRIGERATED BEVERAGES AT DRINKING TEMPERATURE |
CH661856A5 (en) * | 1986-12-22 | 1987-08-31 | Tyler Refrigeration Gmbh | OPERATING COUNTER WITH COOLING DEVICE. |
US4750335A (en) * | 1987-06-03 | 1988-06-14 | Hill Refrigeration Corporation | Anti-condensation means for glass front display cases |
-
1989
- 1989-06-12 SE SE8902104A patent/SE462826B/en not_active IP Right Cessation
-
1990
- 1990-06-12 DE DE90850232T patent/DE69004010T2/en not_active Expired - Fee Related
- 1990-06-12 FI FI902949A patent/FI88575C/en active IP Right Grant
- 1990-06-12 EP EP90850232A patent/EP0403459B1/en not_active Expired - Lifetime
- 1990-06-12 DK DK90850232.1T patent/DK0403459T3/en active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4341089A (en) * | 1978-02-10 | 1982-07-27 | Tyler Refrigeration Corporation | Self heating refrigerator |
DE3113571A1 (en) * | 1981-04-03 | 1982-11-11 | Linde Ag, 6200 Wiesbaden | Refrigerated shelf unit |
AT380330B (en) * | 1982-08-03 | 1986-05-12 | May Herbert | CLIMATE CABINET FOR HEATING REFRIGERATED BEVERAGES AT DRINKING TEMPERATURE |
CH661856A5 (en) * | 1986-12-22 | 1987-08-31 | Tyler Refrigeration Gmbh | OPERATING COUNTER WITH COOLING DEVICE. |
US4750335A (en) * | 1987-06-03 | 1988-06-14 | Hill Refrigeration Corporation | Anti-condensation means for glass front display cases |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0709046A3 (en) * | 1994-10-24 | 1999-05-19 | Sanyo Electric Co. Ltd | Open showcase |
GB2336656A (en) * | 1998-04-23 | 1999-10-27 | Halton Oy | Refrigerated display case |
GB2336656B (en) * | 1998-04-23 | 2002-07-10 | Halton Oy | Air circulation system for a refrigerated display case |
WO2000033707A1 (en) | 1998-12-09 | 2000-06-15 | Nevoret-Concept | Open display case |
FR2786999A1 (en) | 1998-12-09 | 2000-06-16 | Nevoret Concept | REFRIGERATION SALES FURNITURE |
EP1460358A4 (en) * | 2001-12-27 | 2006-11-08 | Gac Corp | Storage device |
EP1460358A1 (en) * | 2001-12-27 | 2004-09-22 | Gac Corporation | Storage device |
CN100350203C (en) * | 2004-07-30 | 2007-11-21 | 上海海立中野冷机有限公司 | Open type vertical refrigerated cabinet |
WO2011074993A1 (en) * | 2009-12-17 | 2011-06-23 | Jbg-2 Sp. Z O.O. | A set of refrigerated display cases |
WO2020109808A1 (en) * | 2018-11-29 | 2020-06-04 | Aerofoil Energy Limited | Refrigerators |
WO2020229832A1 (en) * | 2019-05-16 | 2020-11-19 | Aerofoil Energy Limited | Refrigerators |
CN113840558A (en) * | 2019-05-16 | 2021-12-24 | 艾若弗尔能源有限公司 | Refrigerator with a door |
CN113840558B (en) * | 2019-05-16 | 2023-08-25 | 艾若弗尔能源有限公司 | Refrigerator with a refrigerator body |
US11779136B2 (en) | 2019-05-16 | 2023-10-10 | Aerofoil Energy Limited | Process for optimising the position of refrigerator air guides in order to achieve increased energy efficiency of the refrigerator |
Also Published As
Publication number | Publication date |
---|---|
SE462826B (en) | 1990-09-10 |
DE69004010D1 (en) | 1993-11-25 |
DK0403459T3 (en) | 1994-01-17 |
SE8902104D0 (en) | 1989-06-12 |
EP0403459B1 (en) | 1993-10-20 |
DE69004010T2 (en) | 1994-02-17 |
FI88575B (en) | 1993-02-26 |
FI902949A0 (en) | 1990-06-12 |
FI88575C (en) | 1993-06-10 |
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