EP3745926B1 - Refrigerated sales cabinet - Google Patents

Refrigerated sales cabinet Download PDF

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Publication number
EP3745926B1
EP3745926B1 EP18703006.9A EP18703006A EP3745926B1 EP 3745926 B1 EP3745926 B1 EP 3745926B1 EP 18703006 A EP18703006 A EP 18703006A EP 3745926 B1 EP3745926 B1 EP 3745926B1
Authority
EP
European Patent Office
Prior art keywords
refrigerated sales
air flow
cooling air
cabinet
air duct
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.)
Active
Application number
EP18703006.9A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3745926A1 (en
Inventor
Dimitri Keller
Stefan Ullrich
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.)
Carrier Corp
Original Assignee
Carrier Corp
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 Carrier Corp filed Critical Carrier Corp
Publication of EP3745926A1 publication Critical patent/EP3745926A1/en
Application granted granted Critical
Publication of EP3745926B1 publication Critical patent/EP3745926B1/en
Active 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
    • A47F3/0404—Cases or cabinets of the closed type
    • A47F3/0408—Cases or cabinets of the closed type with forced air circulation
    • 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
    • A47F3/0404—Cases or cabinets of the closed type
    • A47F3/0426—Details
    • A47F3/0434—Glass or transparent panels

Definitions

  • the invention relates to a refrigerated sales cabinet comprising at least one transparent door which is configured to reduce the risk of condensation at such door.
  • refrigerated sales cabinets are often equipped with transparent doors, in particular glass doors establishing a separation between a refrigerated sales space inside the refrigerated sales cabinet and the environment outside the refrigerated sales cabinet.
  • transparent doors in particular glass doors establishing a separation between a refrigerated sales space inside the refrigerated sales cabinet and the environment outside the refrigerated sales cabinet.
  • condensate forms at the transparent doors, particularly at the inner surface of the transparent doors, which is undesirable and should be avoided.
  • US 4 478 047 shows a refrigerated display case having a display section within a cabinet and a movable door covering a front access opening to such display section.
  • the door includes a frame member in which two glass members are mounted with an air space between the glass members.
  • a refrigeration air conduit extends along the top, bottom and rear walls of the cabinet.
  • the air conduit has an outlet opening and an inlet opening at opposing ends thereof with the openings being in alignment so that air leaving the outlet opening will be directed towards and received by the inlet opening thereby forming an air curtain across the front opening of the cabinet along the path inside the door.
  • refrigerated air is circulated through the air conduit and a refrigeration mechanism arranged within the conduit so as to establish a refrigerated air band and a refrigerated air curtain across the front opening in the cabinet.
  • a refrigeration mechanism arranged within the conduit so as to establish a refrigerated air band and a refrigerated air curtain across the front opening in the cabinet.
  • a refrigerated sales cabinet according to exemplary embodiments of the invention comprises the features of claim 1.
  • the inner surface of the at least one transparent door, particularly the upper portion thereof, is ventilated with cooled air from the inside. Hence, condensate formation on the inner surface of the at least one transparent door, particularly at the upper portion thereof, can be prevented.
  • the humidity within the refrigerated sales space is reduced and an unhindered view from outside onto the goods stored within the refrigerated sales space is ensured.
  • the at least one transparent door when the at least one transparent door is closed a substantial amount of a warm ambient air may enter into the refrigerated sales space through gaps between two laterally adjacent transparent doors and/or through gaps between the door frame and the at least one transparent door, in case the transparent door is formed as a pivoting door, and/or through gaps between an upper sliding rail and the upper end of the at least one transparent door, in case the transparent door is formed as a sliding door.
  • the baffle can also be called diverting front section.
  • the baffle can extend over the entire width of the refrigerated sales space. Since the baffle has a curved or inclined underside, it is ensured that the condensate prevention air flow in fact reaches the upper portion of the inner surface of the at least one transparent door and does not circumvent it, and prevents that condensate is forming there.
  • a further benefit of the exemplary embodiments of the invention is the simplicity with which the problem of condensate forming at the upper portion of the inner surface of the at least one transparent door can be solved without the need for modifying the design of the door or adding new active components, such as additional electrical heaters or fans.
  • the existing upper cooling air supply grille and the existing cooling air curtain can be maintained.
  • Existing refrigerated sales cabinets can be retrofitted with such solution by forming at least one condensate prevention air flow channel in or at the front end element of the upper air duct and by modifying the front section of the underside of the roof portion to form a baffle with a curved or inclined underside.
  • the transparent door(s) of the refrigerated sales cabinet can be formed as glass doors of any kind.
  • the transparent door(s) can be formed as sliding door(s) sliding along upper and lower horizontal sliding rails; or as pivoting door(s) arranged within a door frame.
  • the formation of condensate can be prevented on the entire inner surface of the at least one transparent door, not only at the upper portion thereof.
  • the underside of the baffle has a rear end portion which is arranged above the level of the condensate prevention air flow channel and a front portion which is arranged below the level of the condensate prevention air flow channel and includes an angle with respect to a horizontal plane of 30 to 80 degrees.
  • the front end portion of the baffle can end at a position directly adjacent the upper end of the at least one transparent door.
  • the underside of the baffle can comprise a smooth and/or curved transition between its substantially horizontal rear end portion and its front end portion.
  • the transparent door(s) can be formed as sliding door(s) sliding along upper and lower horizontal sliding rails
  • the upper horizontal sliding rail can be mounted to the baffle.
  • the condensate prevention airflow forms a front cooling air curtain and the cooling air supply air flow forms a rear cooling air curtain.
  • At least one of the front end element of the upper air duct and the baffle is formed integral with the roof portion.
  • the front end element of the upper air duct can be formed as one or more separate elements mounted to the roof portion, particularly as one horizontally extending beam mounted to the roof portion; and/or the baffle can be provided as one or more separate elements mounted to the roof portion, particularly as one horizontally extending beam mounted to the roof portion.
  • the at least one condensate prevention air flow channel is dimensioned such that only 2 to 10 % of the mass flow of the cooling air supply air flow, is branched off from the cooling air supply flow flowing through the cooling air supply grille.
  • one condensate prevention airflow channel is provided extending substantially over the width of the refrigerated sales cabinet that corresponds to the width occupied by the at least one transparent door.
  • the height of the condensate prevention air flow channel can be in the range of 1 to 5 mm.
  • a plurality of condensate prevention airflow channels are provided over the width of the refrigerated sales cabinet. 5 to 20 condensate prevention air flow channels can be provided per meter of width. Each of such condensate prevention air flow channels can have a cross-section of 2 to 20 mm 2 .
  • Such embodiments provide a sufficiently dimensioned condensate prevention air flow and thus reliably avoid the formation of condensate on the inner surface of the at least one transparent door.
  • the upper cooling air supply grille can be mounted with its rear end to the ceiling panel of the refrigerated sales space in an airtight fashion; and/or the upper cooling air supply grille can be mounted with its front end to the front end element of the upper air duct in an airtight fashion.
  • the main portion of the cooling air supply air flow is forced to flow through the upper cooling air supply grille and to form a cooling air curtain extending from the upper cooling air supply grille to a bottom front portion, particularly to a return air grille arranged at the bottom front portion of the refrigerated sales cabinet.
  • the front end element of the upper air duct comprises a stepped cross section.
  • the front end element of the upper air duct can comprise a stepped rear side where the upper cooling air supply grille is mounted, and/or a straight front face.
  • the stepped rear side can comprise at least one inclined surface to guide the substantially horizontal cooling air supply air flow downward to exit the upper cooling air supply grille.
  • the at least one condensate prevention air flow channel can extend through such baffle or through a transition portion between the upper end of the baffle and a substantially horizontal roof panel of the roof portion.
  • the front of the roof portion is set back in relation to the bottom front portion of the cabinet body.
  • the front of the roof portion and the bottom front portion lie in one vertical plane.
  • At least one element of a vapor compression cycle including an expansion device and an evaporator, is provided in one or more of the lower, upright and upper air ducts.
  • Fig. 1 shows a schematic side view of a refrigerated sales cabinet 2.
  • the left side wall of the refrigerated sales cabinet 2 is removed in Fig. 1 .
  • the refrigerated sales cabinet 2 comprises a cabinet body 4 including a roof portion 6, a rear wall 8 and a bottom portion 10 enclosing a refrigerated sales space 12 in which goods to be presented therein can be stored and placed on respective shelves.
  • the refrigerated sales space 12 comprises a lowermost shelf and three intermediate shelves, onto which goods may be placed.
  • the refrigerated sales space 12 is limited by a lowermost shelf which is formed as a bottom panel 18, a preferably perforated rear panel 16, and a ceiling panel 14.
  • the bottom portion 10 comprises a substantially horizontal bottom plate and a bottom front portion extending upward therefrom.
  • a return air grille 34 is arranged between the front end of the bottom panel 18 and the bottom front portion. Return air is guided through such return air grille 34 out of the refrigerated sales space 12 and to an evaporator (not shown) of a conventional vapour compression cycle.
  • a lower air duct 40 is formed between the bottom plate of the bottom portion 10 of the cabinet body 4 and the bottom panel 18, an upright air duct 38 is formed between the rear wall 8 of the cabinet body 4 and the rear panel 16, and an upper air duct 36 is formed between the substantially horizontal roof portion 6 of the cabinet body 4 and the ceiling panel 14.
  • the refrigerated sales cabinet 2 is provided with transparent doors 30 and has an access area, which extends between the front of the roof portion 6 and the upper end of the bottom front portion.
  • the front of the roof portion 6 is set back by a distance X such that the access area is angled with respect to a vertical plane.
  • the front of the roof portion 6 and the bottom front portion lie in one vertical plane.
  • Fig. 1 two transparent doors 30 are shown, and they are arranged in front of the refrigerated sales space 12. In the exemplary embodiment, they have a bent shape, the bent portion of which being arranged approximately in the lower third of the height of the transparent doors 30.
  • the transparent doors 30 are formed as transparent sliding doors 30 which can be slid to the left and to the right and which are guided in lower and upper sliding raids 32, 28.
  • the transparent sliding doors 30 can be moved between a closed position in which the goods access area extending between the front of the roof portion 6 and the bottom front portion is closed and an access portion in which the transparent sliding doors 30 overlap and allow access to the refrigerated sales space 12 for a customer standing in front of the refrigerated sales cabinet 2.
  • a cooling air supply grille 24 is arranged between the front end of the ceiling panel 14 and a front end element 20 of the upper air duct 36, to supply fresh refrigerated air to the refrigerated sales space 6 and to form a cooling air curtain 44 extending between the cooling air supply grille 24 and the cooling air return grille 34.
  • the cooling air supply grille 24 is arranged in an inclined fashion, such that the cooling air curtain 44 formed by the cooling air flow exiting the cooling air supply grille 24 is guided into the direction of the cooling air return grille 34 and particularly such that the angle of inclination of the cooling air supply grille 24 with respect to a horizontal plane corresponds to the angle which is formed by a substantially vertical plane and the angle of a straight line connecting the cooling air supply grille 24 with the cooling air return grille 34.
  • a light unit 41 may be arranged in front of the cooling air supply grille 24.
  • the roof portion 6 of the cabinet body 4 comprises a roof plate which extends substantially horizontally to the front from the upper end of the rear wall 8.
  • the roof portion 6 further comprises a front end element 20 and a baffle 26.
  • the front end element 20 and the baffle 26 can be formed integral with the horizontal roof plate.
  • one or both of the front end element 20 and the baffle 26 can be formed as separate elements mounted to the roof plate.
  • one or both of the front end element 20 and the baffle 26 can be formed as horizontally extending beams mounted to the roof plate 6.
  • the front end element 20 closes the upper air duct 36 to the front. It has a stepped cross-section, seen from top to bottom and particularly a stepped rear side, to the underside of which the upper cooling air supply grille 24 is mounted.
  • the front face of the front end element 20 can be straight.
  • the rear face of the upper, wider part of the front end element 20 can be inclined to form an inclined baffle for directing the substantially horizontal cooling air supply flow 42 downward to flow through the cooling air supply grille 24 and to exit the same into the direction of the lower cooling air return grille 34 and to form a cooling air curtain 44.
  • At least one substantially horizontal condensate prevention air flow channel is provided and extends horizontally through the front end element 20 of the upper air duct 36.
  • the baffle 26 at the front of the roof plate has a curved or inclined underside which is configured and arranged with respect to the condensate prevention air flow channel 22 such that a condensate prevention air flow which is branched off the cooling air supply flow 42, flows through the condensate prevention air flow channel 22 and impinges onto the underside of the baffle 26 such that the condensate prevention air flow 46 is deflected and directed to the upper portion of the inner surface of the transparent sliding doors 30.
  • the underside of the baffle 26 can have a rear end portion which is arranged above the level of the condensate prevention air flow channel 22 and a front portion which is arranged below the level of the condensate prevention air flow channel 22 and includes an angle with respect to a horizontal plane of 30 to 80 degrees.
  • the front end portion of the baffle 26 ends at a position directly adjacent the upper end of the transparent sliding doors 30.
  • the underside of the baffle 26 comprises a smooth curved transition between its substantially horizontal rear end portion and its front end portion.
  • the size of the condensate prevention air flow channel 22 is dimensioned such that only a small portion of the cooling air supply air flow 42, particularly only between 2 to 10 % of the mass flow of the cooling air supply air flow 42, is branched off from the cooling air supply flow flowing through the cooling air supply grille 24 and forming the cooling air curtain 44.
  • the height of the condensate prevention air flow channel 22 is in the range of 1 to 5 mm, in case a continuous condensate prevention air flow channel 22 is provided extending substantially over the whole width of the refrigerated sales cabinet 2 that corresponds to the width occupied by the sliding doors 30.
  • condensate prevention air flow channels 22 are provided over the width of the refrigerated sales cabinet 2 at positions above the transparent sliding doors 30, 5 to 20 condensate prevention air flow channels 22 can be provided per meter of width, and each of such condensate prevention air flow channels 22 can have a cross-section of 2 to 20 mm 2 .
  • the condensate prevention airflow 46 is branched off from the cooling air supply air flow 42, flows through the one or more of the condensate prevention air flow channels 22, impinges onto the underside of the baffle 26, is deflected and directed to the upper portion of the inner surfaces of the transparent supplying doors 30, forms a second, front cooling air curtain which flows downward along the inner surface of the sliding doors 30 and merges with the first, rear cooling air curtain 44 at a position above or at the cooling air return grille 34.
  • the condensate prevention air flow 46 thus forms a second cooling air curtain, the main purpose of which, however, is to avoid the formation of condensate on the transparent sliding doors 30 caused by warm ambient air entering into the refrigerated sales space 12 from outside the refrigerated sales cabinet 2.
  • Fig. 2 shows an enlarged detail of the refrigerated sales cabinet 2 of Fig. 1 , namely the front top portion of the refrigerated sales cabinet 2 including the cooling air supply grille 24, the front end element 20, the baffle 26, the upper sliding rail 28 and the upper end of the transparent sliding doors 30.
  • warm ambient air enters through gaps 50 between the two laterally adjacent transparent sliding doors (see the two lower arrows) and through gaps between the upper end of the transparent sliding doors 30 and the horizontal upper sliding rail 28.
  • the condensate prevention air flow 46 entrains such warm ambient air with it to merge with the condensate prevention air flow 46 thereby reliably avoiding the formation of condensate at the inner surface of the transparent sliding door 30.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Freezers Or Refrigerated Showcases (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
EP18703006.9A 2018-02-02 2018-02-02 Refrigerated sales cabinet Active EP3745926B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2018/052640 WO2019149366A1 (en) 2018-02-02 2018-02-02 Refrigerated sales cabinet

Publications (2)

Publication Number Publication Date
EP3745926A1 EP3745926A1 (en) 2020-12-09
EP3745926B1 true EP3745926B1 (en) 2022-10-12

Family

ID=61157216

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18703006.9A Active EP3745926B1 (en) 2018-02-02 2018-02-02 Refrigerated sales cabinet

Country Status (3)

Country Link
EP (1) EP3745926B1 (zh)
CN (1) CN111669997B (zh)
WO (1) WO2019149366A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114484996A (zh) * 2020-11-12 2022-05-13 内蒙古蒙牛乳业（集团）股份有限公司 自动速冷系统、冷仓以及自动速冷方法

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US4478047A (en) * 1980-05-01 1984-10-23 Tyler Refrigeration Corporation Energy efficient glass door merchandiser
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JP3022205B2 (ja) * 1994-10-24 2000-03-15 三洋電機株式会社 オープンショーケース
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JP3649875B2 (ja) * 1997-09-25 2005-05-18 三洋電機株式会社 低温ショーケース
JP2004278864A (ja) * 2003-03-13 2004-10-07 Fuji Electric Retail Systems Co Ltd オープンショーケース
KR20070113275A (ko) * 2005-03-18 2007-11-28 캐리어 코포레이션 냉장 진열장
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Also Published As

Publication number Publication date
WO2019149366A1 (en) 2019-08-08
CN111669997B (zh) 2022-03-04
CN111669997A (zh) 2020-09-15
EP3745926A1 (en) 2020-12-09

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