US3812684A - Refrigerated display case - Google Patents

Refrigerated display case Download PDF

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Publication number
US3812684A
US3812684A US00312977A US31297772A US3812684A US 3812684 A US3812684 A US 3812684A US 00312977 A US00312977 A US 00312977A US 31297772 A US31297772 A US 31297772A US 3812684 A US3812684 A US 3812684A
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United States
Prior art keywords
air
refrigerated
case
display case
curtain
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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.)
Expired - Lifetime
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US00312977A
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English (en)
Inventor
G Brown
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.)
Kysor Industrial Corp
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Kysor Industrial Corp
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Filing date
Publication date
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Priority to US00312977A priority Critical patent/US3812684A/en
Priority to JP48084191A priority patent/JPS4990100A/ja
Application granted granted Critical
Publication of US3812684A publication Critical patent/US3812684A/en
Assigned to KYSOR INDUSTRIAL CORPORATION, A CORP. OF reassignment KYSOR INDUSTRIAL CORPORATION, A CORP. OF ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KYSOR INDUSTRIAL CORPORATION, A CORP. OF DE.
Anticipated expiration legal-status Critical
Assigned to JPMORGAN CHASE BANK, N.A. AS AGENT reassignment JPMORGAN CHASE BANK, N.A. AS AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KYSOR INDUSTRIAL CORPORATION
Expired - Lifetime 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

  • a refrigerated display case includes an open front permitting customer access to the products contained [21] Appl- 312,977 therein and rear doors permitting access for restocking.
  • An inner curtain of refrigerated air is circulated 52 US. Cl 62/89, 62/256, 62/248, across the Open from and adjacent Surfaces forming a 9 /3 portion of the display case to refrigerate the contents [5 1] Int. Cl.
  • The'case includes an air inlet extending along [58] Field'of Search 62/248, 256,89, 25s; the lower from of the case for drawing cooled air 9 /3 therein which is then circulated rearwardly and discharged upwardly adjacent the exterior surface of the 5 References Cited rear doors to prevent condensation thereon.
  • the present invention relates to a refrigerated display case of the type employing multiple air curtains extending across an open front.
  • refrigerated display cases of the type which employ a curtain of refrigerated air extending across an open front an air intake extending along the lower edge of the front of the case in alignment with the air curtain is typically employed to collect the stream of refrigerated air.
  • a portion of the cold air forming the curtain tends to mix with adjacent ambient air which is cooled thereby and falls over the front of the case into the aisle.
  • This mixing action which results in the loss of some of the refrigerated air not only reduces the efficiency of operation of the case, it also is frequently a cause of discomfort to a consumer selecting products from the case.
  • the removal of cooled air from the aisle in front of a refrigerated display case with a blower has been suggested, but the cooled air so removed has merely been exhausted.
  • Open front refrigerated display cases frequently include glass access doors at the rear of the casefor allowing restocking and the like.
  • the cases typically are aligned along one end of a store thereby forming a wall, with the rear doors of the case communicating with a room of the retail outlet behind the refrigerated display case.
  • the glass doors can become fogged and/or frosted due to condensation, particularly when the room behind the'case is not air conditioned and is relatively warm and humid as during summer months.
  • defrosters which force ambient or heated air adjacent the doors to evaporate the condensation. Although useful in providing defrosting, the air so employed is not further utilized.
  • the refrigerated display case of the present invention I solves the dual problem of cooled air spilled in an aisle this cooler air adjacent the exterior surface of the glass doors.
  • the air so circulated can be recirculated across the open front of the refrigerated display case to form a guard curtain.
  • the efficiency of operation of the refrigeration system of the case is-improved since the circulated spilled air is considerably coolerthan the ambient air. It therefore forms a barrier to reduce heat transfer across the surfaces and open front of the case.
  • Single pane glass access doors can be employed in place of the more expensive multiple thickness type.
  • the recirculated air which is relatively cool, can eliminate condensation on the doors without loading the air conditioning system for the room behind the case as can occur with conventional defrosting systems employing ambient or heated air, especially when several cases are used in an installation.
  • Refrigerated display cases embodying the present invention include an air inletextending along the lower front of the case for removing'cool air in an'aisle. Means are provided for forcing the cool air drawn inwardly through the inlet adjacent the outside surface of an access door at the rear of the case and for recirculating the air across the open front of the case to form at least a portion of a guard curtain.
  • An additionalobject of the present invention is to provide a method of recirculating air spilled over the front of an open front refrigerated display case to form at least a portion of a guard curtain of air.
  • Another object of the present invention is to provide a refrigerated display case with improved operating efficiency.
  • Still a further object of the present invention is to provide a refrigerated display case with a recirculated guard curtain of air at least a portion of which is formed from recirculated cool air which spilled over the front of the display case.
  • An additional object of the presentinvention is to provide structure for recirculating spilled air adjacent the outer surface of access doors at the rear of a refrigerated display case to eliminate condensation thereon.
  • FIG. I is a front perspective view of a refrigerated display case embodying the present invention.
  • FIG. 2 is an enlarged fragmentary perspective view of a portion of the refrigerated display case shown in FIG.
  • FIG. 3 is a rear perspective view of the case shown in FIG. 1;
  • FIG. 4 is a cross-sectional view of the refrigerated display case illustrating the flow of air therein taken along the section lines IV-IV of FIG. 3;
  • FIG. .5 is a fragmentary cross-sectional view of a portion of the case shown in FIG. 4 and taken along the section V-V in FIG. 4.
  • FIGS. 1-3 there is shown an open front refrigerated display case 10 having end walls 12, a top cross member 14 and a bottom support member 15 which extends between the end walls 12.
  • the case so formed defines an open fronted compartment 16 with a rear wall 18 including three glass sliding doors 20.
  • Extending vertically between the sliding glass doors 20 are the walls 19 of hollow return air ducts 36 (FIG. 5) which serve also as superstructure supports for the case.
  • the bottom or bin 26 (FIG. 4) of the compartment is also capable of holding refrigerated products as seen in FIG. 1.
  • an inner curtain 30 of refrigerated air whose path is indicated by the dotted can comprise a honeycomb section of conventional design for directing a refrigerated stream of air downwardly across the open front of the case as seen in FIG. 4.
  • an intake grill 34' Along the top edge of forwardly protruding lip 13 of the display case, i.e'., along thelower edge of the opening, there is provided an intake grill 34'extending the length of the case for drawing the refrigerated curtain of air inwardly therein. The airso captured is then recirculated adjacent the bottom shelf 26, the back-wall sections 19 and the top wall 25 as seen in FIG. 4.
  • the display case includes a second air curtain 40 indicated in FIG. 4 by the solid line arrows.
  • Curtain 40 is adjacent to and exterior of the refrigerated curtain and is emitted from an outer nozzle 42 extending the length of the refrigerated display case-at the top of and exterior to nozzle 32as seen in FIGS. 2 and 4.
  • the inner'refrigerated curtain of air is circulated through the intake grill 34 into a lower plenum chamber 35 and thence into a plurality of ducts 36 extending upwardly adjacent the walls v 19 of the rear wall ofthe'case.
  • Ducts 36 communicate between the lower plenum 35 and an upper plenum 37 in whichthere is provided a blower 38 mounted on a baffle 38' andextending along the width of the case.
  • Blower 38 forces the return air from ducts 36 into a refrigeration chamber 39 including evaporator coils 39 which refrigerate the recirculated air stream to sub-v zero temperatures. The recirculated air is then emitted through nozzle 32 downwardly across the open face of compartment 16 to complete one cycle of recirculatron.
  • Outer curtain 40 is emitted downwardly from nozzle 42 extendingacross the front of the vcase and travels downwardly adjacent and outside of the refrigerated curtain 30 across the open face of the case. During its downward travel, curtain 40 is cooled somewhat by the inner curtain and at the lip 13, mixed with whatever portion of the inner curtain that isnot drawn inwardly through grill 34. Thus, the air curling over lip 13 is a mixture of the inner and outer curtains 30 and 40 and ambient air and is considerably cooler than the ambient aisle air.
  • one or more fans 46 are mounted in a baffle 47 extending between a rear plenum 48 positioned below each sliding door structure 20.
  • An intake duct LII communicates between inlet 44 and fans 46.
  • Fans 46 draw the spilled air inwardly through grill-34 and force the air outwardly through nozzles 49 extending across 6 the top of plenums 48.
  • Nozzles 49 are positioned along the bottom edge of doors 20 adjacent the rear surfaces 4 23 of the doors and extend approximately'the full width of the doors.
  • Air intakes 51 are provided at the top edge of doors 20 opposite nozzles 49.
  • a duct 52 is coupled at one end to intakes 51 and at an opposite end to an intake plenum 53 on top of case 10(Plenum 53is shaped to accommodate a plurality of fans 56 mounted to a baffle 57 extending across the top of the display case.
  • a solid panel 54 couples baffle 57 to duct 52 such that the fans 56 force the cooled air gathered by intakes 51 through 5 nozzle 42 to form the guard curtain 40 thereby completing the cycle of the recirculated cool air.
  • the recirculated cool air which travels adjacent rear surface 23 of doors 20 prevents the build-up of condensation on the doors which then can be made from single panels of glass in place of the conventionally employed multiple panels;
  • the efficiency of operation of the display case is greatly enhanced by recirculating the cool air adjacent the outer surface of the rear doors and other surfaces to aid in maintaining the low temperature of the case while simultaneously removing the cool spilled air from the access aisle in front of the case.
  • the-recirculated cool air formsthe guard curtain 40.
  • the recirculation v.of the spilled air adjacent the outer surface of rear access doors can be used with refrigerated display cases employing a greater number of air curtains formed across the frontopening of the case.
  • the apparatus of the preferred embodiment employs a solid panel.
  • the particularstructure employed to direct the recirculated spilled air across the face of the doors can be modified.
  • a method of reducing condensation on the exterior of an access door. at the rear of an open front refrigerated display case employing a refrigerated curtain of auto maintain the products refrigerated within the case comprising the steps of:
  • a refrigerated display case having a compartment with an open front permitting access to products therein, said case including:
  • said means for forming a curtain of refrigerated air includes a nozzle extending across the open front of said case along the top thereof for directing refrigerated air downwardly; an intake grill extending across the open front of said case near the bottom of the compartment for collecting the refrigerated air curtain; and wherein said means for collecting cool air includes an air inlet extending across said refrigerated display case below said intake grill.
  • said means for recirculating said received air comprises an outer nozzle extending across said refrigerated display case near the top thereof and air moving means communicating between said receiving means and said outer nozzle.
  • the refrigerated display case as defined in claim 9 andfurther including means for mixing ambient air with said received air to form a guard curtain of air exhausted across the front of said case exterior to said curtain of refrigerated air by said outer nozzle[ 11.
  • a refrigerated display case having a rear access door and an open front permitting customer access to the storage area therein, means for providing a refrigerated air curtain extending across the open front to aid in maintaining the storage area refrigerated whereby the refrigerated air curtain tends to cause cool air to fall into the aisle adjacent said refrigerated display case, and means for circulating air from the aisle adjacent and below said storage area around said refrigerated display case in a path extending in part adjacent the exterior surface of the access door.
  • an air intake positioned adjacent an edge of the access door opposite said directing means; and meanscoupled to said intake for receiving air therefrom and discharging the air across the open front of the refrigerated display case exterior to the refrigerated air curtain.

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Freezers Or Refrigerated Showcases (AREA)
US00312977A 1972-12-07 1972-12-07 Refrigerated display case Expired - Lifetime US3812684A (en)

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US00312977A US3812684A (en) 1972-12-07 1972-12-07 Refrigerated display case
JP48084191A JPS4990100A (enrdf_load_html_response) 1972-12-07 1973-07-27

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US00312977A US3812684A (en) 1972-12-07 1972-12-07 Refrigerated display case

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Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5216676U (enrdf_load_html_response) * 1975-07-24 1977-02-05
JPS5291565U (enrdf_load_html_response) * 1975-12-29 1977-07-08
US4165620A (en) * 1977-04-12 1979-08-28 Ludwig Kiesel Ohg Self-service cooling cabinet
FR2458255A1 (fr) * 1979-06-08 1981-01-02 Bonnet Ets Meuble frigorifique a rideau d'air froid
US4299099A (en) * 1979-01-24 1981-11-10 Tyler Refrigeration Corporation Open front refrigeration system
US4484450A (en) * 1982-09-30 1984-11-27 Niagara Frontier Services High efficiency refrigeration system
US4586486A (en) * 1984-07-06 1986-05-06 National Air Systems, Inc. Multilevel air distribution panel for air ventilation hood
US4696226A (en) * 1986-08-28 1987-09-29 Witmer Warner H Fluid barrier curtain system
EP0334678A1 (en) * 1988-03-25 1989-09-27 George Barker And Company (Leeds) Limited Refrigerated display cabinet
FR2686966A1 (fr) * 1992-02-04 1993-08-06 Mc International Procede d'alimentation en frigories d'une enceinte refrigeree ouverte pour l'exposition et la vente en libre service de produits frais.
GB2268975A (en) * 1992-07-14 1994-01-26 Northampton Refrigeration Comp Fan assembly for refrigerated display case
DE19902627A1 (de) * 1999-01-23 2000-07-27 Pliet Guryca Regina Kühlaggregat zur Aufbewahrung verderblicher Lebensmittel
FR2828079A1 (fr) * 2001-08-06 2003-02-07 Bonnet Neve Meuble frigorifique, notamment meuble vertical, du type a rideaux d'air froid a l'avant du meuble
EP1249193A3 (de) * 2001-04-12 2004-03-24 Linde Aktiengesellschaft Kühlregal
WO2004062438A1 (en) * 2003-01-07 2004-07-29 Carrier Commercial Refrigeration, Inc. Refrigerated display merchandiser
US20040163401A1 (en) * 2003-02-26 2004-08-26 Alahyari Abbas A. Refrigerated display merchandiser with improved air curtain
US20070251253A1 (en) * 2004-09-30 2007-11-01 Carrier Corporation Curtain Air Admission Assembly
US20090173093A1 (en) * 2005-04-27 2009-07-09 Fukushima Kogyo Co., Ltd. Refrigerator
US20140263126A1 (en) * 2013-03-15 2014-09-18 Hussmann Corporation Uni-body merchandiser
EP2843328A2 (en) 2013-08-30 2015-03-04 Norpe Oy Back-loadable refrigeration cabinet
US20170258247A1 (en) * 2013-04-08 2017-09-14 Heatcraft Refrigeration Products Llc Deflector for Display Cases
GB2549719A (en) * 2016-04-25 2017-11-01 Wirth Res Ltd An open refrigerated display case
DE102017114623A1 (de) 2017-06-30 2019-01-03 Aht Cooling Systems Gmbh Rückseitig beschickbares Kühlregal
DE102017114625A1 (de) 2017-06-30 2019-01-03 Aht Cooling Systems Gmbh Kühlregal
CN110215129A (zh) * 2019-05-29 2019-09-10 杨伟锋 一种利用风墙保温的半导体多功能冷热食物一体机
NL2023983B1 (en) * 2019-10-09 2021-06-07 Fri Jado Bv System comprising a display unit for storing and displaying food products, and multiple shelves, and use of such a system
US11085455B1 (en) * 2014-08-11 2021-08-10 Delta T, Llc System for regulating airflow associated with product for sale
US11304544B2 (en) * 2019-10-09 2022-04-19 Fri-Jado B.V. System comprising a display unit for storing and displaying food products, and multiple shelves, and method for storing and displaying food products in a display unit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017029604A (ja) * 2015-08-05 2017-02-09 パナソニックＩｐマネジメント株式会社 低温ショーケース

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2993349A (en) * 1960-04-28 1961-07-25 C V Hill & Company Inc Refrigerated display case
US3304736A (en) * 1965-08-06 1967-02-21 Emhart Corp Refrigerated display case
US3675440A (en) * 1970-12-03 1972-07-11 Clark Equipment Co Refrigerated display case

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2993349A (en) * 1960-04-28 1961-07-25 C V Hill & Company Inc Refrigerated display case
US3304736A (en) * 1965-08-06 1967-02-21 Emhart Corp Refrigerated display case
US3675440A (en) * 1970-12-03 1972-07-11 Clark Equipment Co Refrigerated display case

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5216676U (enrdf_load_html_response) * 1975-07-24 1977-02-05
JPS5291565U (enrdf_load_html_response) * 1975-12-29 1977-07-08
US4165620A (en) * 1977-04-12 1979-08-28 Ludwig Kiesel Ohg Self-service cooling cabinet
US4299099A (en) * 1979-01-24 1981-11-10 Tyler Refrigeration Corporation Open front refrigeration system
FR2458255A1 (fr) * 1979-06-08 1981-01-02 Bonnet Ets Meuble frigorifique a rideau d'air froid
US4484450A (en) * 1982-09-30 1984-11-27 Niagara Frontier Services High efficiency refrigeration system
AU571036B2 (en) * 1982-09-30 1988-03-31 Tops Markets, Inc Refrigeration system
US4586486A (en) * 1984-07-06 1986-05-06 National Air Systems, Inc. Multilevel air distribution panel for air ventilation hood
US4696226A (en) * 1986-08-28 1987-09-29 Witmer Warner H Fluid barrier curtain system
WO1988001715A1 (en) * 1986-08-28 1988-03-10 Gas Curtain Technology, Inc. An improved fluid barrier curtain system
EP0334678A1 (en) * 1988-03-25 1989-09-27 George Barker And Company (Leeds) Limited Refrigerated display cabinet
FR2686966A1 (fr) * 1992-02-04 1993-08-06 Mc International Procede d'alimentation en frigories d'une enceinte refrigeree ouverte pour l'exposition et la vente en libre service de produits frais.
EP0555137A1 (fr) * 1992-02-04 1993-08-11 M.C. International Procédé d'alimentation en frigories d'une enceinte réfrigérée ouverte pour l'exposition et la vente en libre-service de produits frais, et installation pour la mise en oeuvre de ce procédé
US5315837A (en) * 1992-02-04 1994-05-31 M. C. International Process for supplying cold to an open refrigerated enclosure for display and sale of fresh products in a supermarket
GB2268975A (en) * 1992-07-14 1994-01-26 Northampton Refrigeration Comp Fan assembly for refrigerated display case
GB2268975B (en) * 1992-07-14 1996-04-24 Northampton Refrigeration Comp Fan assembly for refrigerated display case
DE19902627A1 (de) * 1999-01-23 2000-07-27 Pliet Guryca Regina Kühlaggregat zur Aufbewahrung verderblicher Lebensmittel
EP1249193A3 (de) * 2001-04-12 2004-03-24 Linde Aktiengesellschaft Kühlregal
FR2828079A1 (fr) * 2001-08-06 2003-02-07 Bonnet Neve Meuble frigorifique, notamment meuble vertical, du type a rideaux d'air froid a l'avant du meuble
WO2003013317A1 (fr) * 2001-08-06 2003-02-20 Bonnet Neve Meuble frigorifique, notamment meuble vertical, du type a rideaux d'air froid a l'avant du meuble
WO2004062438A1 (en) * 2003-01-07 2004-07-29 Carrier Commercial Refrigeration, Inc. Refrigerated display merchandiser
US20090255287A1 (en) * 2003-02-26 2009-10-15 Hill Phoenix, Inc. Refrigerated display merchandiser with improved air curtain
US20040163401A1 (en) * 2003-02-26 2004-08-26 Alahyari Abbas A. Refrigerated display merchandiser with improved air curtain
US20070251253A1 (en) * 2004-09-30 2007-11-01 Carrier Corporation Curtain Air Admission Assembly
US7681409B2 (en) 2004-09-30 2010-03-23 Hill Phoenix, Inc. Curtain air admission assembly
US20090173093A1 (en) * 2005-04-27 2009-07-09 Fukushima Kogyo Co., Ltd. Refrigerator
US20140263126A1 (en) * 2013-03-15 2014-09-18 Hussmann Corporation Uni-body merchandiser
US10117525B2 (en) * 2013-03-15 2018-11-06 Hussmann Corporation Uni-body merchandiser
US10383459B2 (en) * 2013-04-08 2019-08-20 Kysor Warren Epta Us Corporation Deflector for display cases
US20170258247A1 (en) * 2013-04-08 2017-09-14 Heatcraft Refrigeration Products Llc Deflector for Display Cases
EP2843328A2 (en) 2013-08-30 2015-03-04 Norpe Oy Back-loadable refrigeration cabinet
EP2843328A3 (en) * 2013-08-30 2015-06-24 Norpe Oy Back-loadable refrigeration cabinet
US11085455B1 (en) * 2014-08-11 2021-08-10 Delta T, Llc System for regulating airflow associated with product for sale
GB2549719B (en) * 2016-04-25 2018-09-26 Wirth Res Limited An open refrigerated display case
GB2549719A (en) * 2016-04-25 2017-11-01 Wirth Res Ltd An open refrigerated display case
DE102017114625A1 (de) 2017-06-30 2019-01-03 Aht Cooling Systems Gmbh Kühlregal
DE102017114623A1 (de) 2017-06-30 2019-01-03 Aht Cooling Systems Gmbh Rückseitig beschickbares Kühlregal
CN110215129A (zh) * 2019-05-29 2019-09-10 杨伟锋 一种利用风墙保温的半导体多功能冷热食物一体机
NL2023983B1 (en) * 2019-10-09 2021-06-07 Fri Jado Bv System comprising a display unit for storing and displaying food products, and multiple shelves, and use of such a system
US11304544B2 (en) * 2019-10-09 2022-04-19 Fri-Jado B.V. System comprising a display unit for storing and displaying food products, and multiple shelves, and method for storing and displaying food products in a display unit
US11304543B2 (en) * 2019-10-09 2022-04-19 Fri-Jado B.V. System comprising a display unit for storing and displaying food products, and multiple shelves, and method for storing and displaying refrigerated food products in a display unit

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Publication number Publication date
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Legal Events

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AS Assignment

Owner name: KYSOR INDUSTRIAL CORPORATION, A CORP. OF MI.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KYSOR INDUSTRIAL CORPORATION, A CORP. OF DE.;REEL/FRAME:004474/0605

Effective date: 19850822

AS Assignment

Owner name: JPMORGAN CHASE BANK, N.A. AS AGENT, ILLINOIS

Free format text: SECURITY INTEREST;ASSIGNOR:KYSOR INDUSTRIAL CORPORATION;REEL/FRAME:022416/0346

Effective date: 20081217