EP1203551B1 - Kühltheke und Verfahren zur Verhinderung des Beschlagens von deren transparenten Elementen - Google Patents

Kühltheke und Verfahren zur Verhinderung des Beschlagens von deren transparenten Elementen Download PDF

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Publication number
EP1203551B1
EP1203551B1 EP01126207A EP01126207A EP1203551B1 EP 1203551 B1 EP1203551 B1 EP 1203551B1 EP 01126207 A EP01126207 A EP 01126207A EP 01126207 A EP01126207 A EP 01126207A EP 1203551 B1 EP1203551 B1 EP 1203551B1
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EP
European Patent Office
Prior art keywords
electric
zones
case
zone
areas
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.)
Expired - Lifetime
Application number
EP01126207A
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English (en)
French (fr)
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EP1203551A1 (de
Inventor
Romolo Rossi
Francesco Pellovini
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.)
Industrie Scaffalature Arredamenti- ISA SpA
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Industrie Scaffalature Arredamenti- ISA SpA
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Publication of EP1203551A1 publication Critical patent/EP1203551A1/de
Application granted granted Critical
Publication of EP1203551B1 publication Critical patent/EP1203551B1/de
Anticipated expiration legal-status Critical
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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
    • A47F3/0426—Details
    • A47F3/0434—Glass or transparent panels

Definitions

  • the invention concerns a refrigerated display-case employed to display, preserve and sell refrigerated food products.
  • the refrigerated display-case according to the invention is equipped with transparent elements of the type through which, when fed from a suitable source, an electric current is able to pass, according to claim 1.
  • the refrigerated display-case according to the invention has at least a relative transparent element divided, at least in the part nearest the products to be refrigerated, into sections which are partly separated electrically from each other, in order to limit the area of the transparent element affected by the circulation of electric current. This allows to diminish the consumption of electric energy and to reduce to a minimum the influence of the anti-fogging operation on the preservation parameters of the food products.
  • the phenomenon of fogging is due in particular to the high humidity and the low temperature of the inner environment.
  • fogging causes water droplets which can damage the products displayed or their packaging. Moreover, in the long run, the droplets can damage the metal parts of the refrigerated display-cases, or reach the electric parts with dangerous consequences for both workers and customers.
  • the state of the art uses anti-fogging electric devices.
  • the heat strips of the type used in the rear windows of cars which are made by depositing in a desired geometric pattern a conductor paste, for example made of silver, to which metal elements with a high electric resistivity are added.
  • the state of the art also uses pyrolitic glass, at least the inner surfaces of which are lined with layers of metal oxides which can be fed electrically so as to heat, according to cycles of programmed activation, the entire surface of the glass.
  • Pyrolitic glass is particularly appreciated by businessmen working in this field because it achieves the anti-fogging function without substantially entailing any visible aesthetic modification to the transparent surface.
  • Pyrolitic glass is normally fed electrically by means of two serigraph strips, arranged in correspondence with the upper edge and the lower edge of the glass; the strips are usually hidden by frames or finishings near the supporting shelves inside the display-case.
  • condensation forms mainly if not exclusively in the lower part of the transparent element, that is to say, in the part affected by the recirculation of cold air near the products to be refrigerated.
  • Another problem of conventional pyrolitic glass is that it is difficult for producers to guarantee a reliable electric behavior thereof, that is to say, a resistivity which will maintain sufficiently safe values in the range of the declared nominal value.
  • WO 00/53062 discloses a display case comprising a front glass panel on a surface of which are applied one or more electrically conductive coatings extending between a pair of spaced apart electrically conductive strips. When electrical current is applied to the conductive strips, electric current passes through the conductive coating to heat the glass panel.
  • This system allows to selectively heat pre-determined regions of the panel where a relative conductive coating is applied; however, this system does not allow to delimit the passage of the electric current to a small area of the transparent panel which is entirely covered with a conductive coating.
  • the purpose of the invention is to achieve a refrigerated display-case for the preservation, display and sale of food products, and an anti-fogging method for the display-case, wherein it is possible to obtain a significant saving in electric energy required, thus solving a problem of consumption and also a problem of incidence on the thermostat parameters of the products.
  • Another purpose is to reduce the values of feed tension, avoiding the need to use a double glass to meet the safety requirements concerning electricity.
  • a further purpose is to reduce the problems deriving from an electric behavior, in terms of resisitivity of the transparent element, which is not coherent with the nominal values declared by the producer.
  • the invention provides to use glass of a pyrolitic type, that is, with at least the inner face lined or embedded with electric conductor metal oxides.
  • the pyrolitic glass is divided, at least in the zone nearest the products to be refrigerated, that is, where condensation is most likely to form and hence fogging is most likely to occur, into a plurality of zones which are partly separated electrically, and which can be fed separately and independently.
  • each of said zones is partly separated from the adjacent zone by means of at least an area of electric discontinuity, so that, by suitably feeding the individual zones, for example by arranging alternately electric poles of opposite sign, the electric current is propagated from one zone to another, substantially flowing around the areas of discontinuity.
  • the electric feed to the pyrolitic glass is supplied by means of a serigraph strip in correspondence with the lower edge of the glass, which can be suitably covered by frames or finishings.
  • the areas of electric discontinuity consist, for example, of thin notches made on the inner face of the glass and extending, with respect to the lower edge, for a height correlated to the extension of the zone of the glass which is to be heated.
  • every zone of the glass is equipped with a conductor element having a pole of the opposite sign with respect to the pole with which the adjacent zone or zones are equipped, the current flows from one zone to another around the areas of discontinuity, thus causing only the lower zone of the glass to be heated.
  • the heating of the pyrolitic glass is limited only to the zone or zones where said heating is necessary; this allows to reduce the feed tension to limited values, for example around 24V, which does not necessarily require the use of a double glass.
  • the elements of electric feed can be suitably arranged in covered or at least non-visible zones.
  • the areas of discontinuity are defined by polished segments wherein the pyrolitic lining of the glass is removed.
  • the areas of discontinuity are defined by segments of non-conductor material applied to separate two or more adjacent zones.
  • the number 10 denotes generally an example of refrigerated display-case of the type used to display and sell refrigerated products, for example ice-cream, cakes, ice-cream cakes, sweets and similar.
  • the display-case 10 comprises a base 11 defining a motor compartment 12 housing the technological equipment, indicated in their entirety by the number 13, needed for the display-case to function.
  • a container 14 which supports the loading plane 17 and the serving plane or work plane 29 located on the operator's side.
  • the numbers 20 and 21 also refer to transparent elements made of different material other than glass.
  • a technical compartment 16 one zone of which houses the ventilation assembly 22, which determines the circulation of cold air in the display-case 10, and the refrigeration assembly 30.
  • the front glass 20 is normally closed and allows the customers to see the products, to make their selection and order.
  • the front glass 20 according to the invention shown in a front view from its inner side in Fig. 2, is of the pyrolitic type and an electric current is able to flow through it, if fed by an appropriate source.
  • a conductor element 23 is arranged able to be connected, by means of a suitable conductor strip 24, for example serigraphed, to a source of electric feed 25.
  • the conductor elements 23 and the conductor strip 24 are substantially in correspondence with the lower edge of the glass 20, in a zone which is normally covered from sight by means of frames or finishings.
  • the conductor elements 23 define electric poles of opposite sign, then the electric current fed on one side of the glass 20 will flow from one zone 19 to the other as far as the opposite side of the glass 20, following a path indicated by the line of dashes 26 which passes over the notches 18 while remaining substantially near them.
  • the electric current affects and heats only a lower portion of height "1" of the whole glass 20, that is, that portion in which, due to the proximity to the products and hence to the zone where the cold air circulates, it is more likely that condensation will form and hence fogging occur.
  • the arrangement of the refrigerated products inside, the way in which the cold air circulates, the position of the air intakes and outlets, etc., the arrangement of the areas of discontinuity defined by the notches 18 can be different, allowing to selectively heat desired portions of the glass 20, for example upper, lateral, longitudinal or transverse portions, etc.
  • the areas of discontinuity can be defined, in substantially analogous and equivalent fashion, by polished segments, with the conductor metal oxides being at least partly removed, or by non-conductor segments applied in suitable zones of separation between adjacent zones 19.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Freezers Or Refrigerated Showcases (AREA)
  • Refrigerator Housings (AREA)
  • Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)

Claims (11)

  1. Kühlvitrine für die Frischhaltung und Ausstellung von Lebensmittelprodukten, welche mindestens ein transparentes Element (20) der Art, durch die elektrischer Strom fließen kann, aufweist, wobei das transparente Element (20) ein Glas mit mindestens einer Innenfläche ist, die mit Metalloxiden ausgekleidet ist oder in die Metalloxide eingebettet sind, das zumindest in dem Abschnitt, der den gekühlten Produkten am nächsten ist, in eine Vielzahl von nebeneinander liegenden Zonen (19) aufgeteilt ist, die durch Bereiche (18) elektrischer Diskontinuität teilweise elektrisch voneinander getrennt sind, wobei die Zonen elektrischer Diskontinuität aus einem Mittel bestehen, das den Durchgang von elektrischem Strom verhindern kann, und die Zonen (19) jeweils durch Leiterelemente (23), die mit mindestens einer Stromversorgungsquelle (25) verbunden sind, individuell versorgt werden können, dadurch gekennzeichnet, dass ein elektrischer Stromfluss erhalten wird, der von einer der Zonen (19) zu einer anderen der Zonen fließt, während er einem Weg folgt, der die Bereiche (18) elektrischer Diskontintuität im Wesentlichen umfließt.
  2. Kühlvitrine nach Anspruch 1, dadurch gekennzeichnet, dass die Bereiche (18) elektrischer Diskontinuität in einer Weise angeordnet und dimensioniert sind, die mit dem Teil des Glases (20), in dem der elektrische Strom fließen soll, korreliert ist.
  3. Kühlvitrine nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass das Mittel, das den Durchgang von elektrischem Strom verhindern kann, aus Kerben (18) besteht, wo die Metalloxide lokal entfernt wurden.
  4. Kühltheke nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass das Mittel, das den Durchgang von elektrischem Strom verhindern kann, aus polierten Segmenten besteht, wo die Metalloxide zumindest teilweise entfernt wurden.
  5. Kühltheke nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass das Mittel, das den Durchgang von elektrischem Strom verhindern kann, aus Nichtleitersegmenten besteht, die entsprechend der Trennzonen zwischen benachbarten Zonen (19) angebracht sind.
  6. Kühlvitrine nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Leiterelement (23), das einer Zone (19) zugeordnet ist, einen elektrischen Pol mit entgegengesetztem Vorzeichen in Bezug auf das Vorzeichen des Leiterelements (23) der benachbarten Zone (19) definieren kann, so dass der elektrische Strom von einer Zone (1 9) zur benachbarten Zone 19 fließt, während er einem Weg folgt, der die Diskontinutitätsbereiche (18) im wesentlichen umfließt.
  7. Kühlvitrine nach Anspruch 6, dadurch gekennzeichnet, dass die Leiterelemente (23) entsprechend einer Zone des Glases (20), die abgedeckt werden kann, angeordnet werden.
  8. Kühlvitrine nach Anspruch 7, dadurch gekennzeichnet, dass die Leiterelemente (23) mittels mindestens eines Leiterelements (24) vom Flachleiter-Typ, welches entsprechend einer Zone des Glases (20), die abgedeckt werden kann, angeordnet ist, elektrisch miteinander verbunden sind.
  9. Antibeschlagsverfahren für Kühltheken (10) für die Frischhaltung und Ausstellung von Lebensmittelprodukten, wobei die Theken (10) mindestens ein transparentes Element (20) aufweisen, durch das elektrischer Strom fließen kann, wobei das Verfahren dadurch gekennzeichnet ist, dass es eine Anordnung einer Vielzahl von Bereichen (18) elektrischer Diskontinuität auf dem transparenten Element (20) bereitstellt, welche eine Vielzahl von Zonen (19) definieren, die nebeneinander liegen und teilweise elektrisch voneinander getrennt sind, dass es die Zonen (19) unabhängig voneinander versorgt und dass es einen elektrischen Stromfluss (26) bewirkt, der von einer der Zonen (19) zu einer anderen fließt, während er einem Weg folgt, der die Bereiche (18) elektrischer Diskontinuität im Wesentlichen umfließt.
  10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, dass es jeder der Zonen (19) ein Leiterelement (23) zuordnet, das einen elektrischen Pol mit entgegengesetztem Vorzeichen als der des Leiterelements (23) der benachbarten Zone (19) definiert, so dass der elektrische Stromfluss (26) von einer Zone (19) zur benachbarten Zone (19) fließt, während er einem Weg folgt, der über die Diskontinuitätsbereiche (18) verläuft und im Wesentlichen in deren Nähe bleibt.
  11. Verfahren nach einem der Ansprüche 9 oder 10, dadurch gekennzeichnet, dass es eine elektrische Verbindung der Leiterelemente (23) mittels mindestens eines Leiterelements (24) bereitstellt, das mit einer Stromversorgungsquelle (25) verbunden ist, und dass es die Leiterelemente (23) und das mindestens eine Leiterelement (24) in einer Zone des transparenten Elements (20), die abgedeckt werden kann, anordnet.
EP01126207A 2000-11-06 2001-11-05 Kühltheke und Verfahren zur Verhinderung des Beschlagens von deren transparenten Elementen Expired - Lifetime EP1203551B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2000UD000205A IT1315143B1 (it) 2000-11-06 2000-11-06 Vetrina refrigerata e metodo per evitare l'appannamento degli elementitrasparenti di tale vetrina.
ITUD000205 2000-11-06

Publications (2)

Publication Number Publication Date
EP1203551A1 EP1203551A1 (de) 2002-05-08
EP1203551B1 true EP1203551B1 (de) 2006-05-31

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EP01126207A Expired - Lifetime EP1203551B1 (de) 2000-11-06 2001-11-05 Kühltheke und Verfahren zur Verhinderung des Beschlagens von deren transparenten Elementen

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EP (1) EP1203551B1 (de)
AT (1) ATE327704T1 (de)
DE (1) DE60120080D1 (de)
IT (1) IT1315143B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11116333B2 (en) 2019-05-07 2021-09-14 Carrier Corporation Refrigerated display cabinet including microchannel heat exchangers
US11559147B2 (en) 2019-05-07 2023-01-24 Carrier Corporation Refrigerated display cabinet utilizing a radial cross flow fan

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3241622A1 (de) * 1982-11-11 1984-05-17 Allgemeine Kühlmöbelbau GmbH & Co KG, 8904 Friedberg Kuehlmoebel
JPH11314943A (ja) * 1999-02-05 1999-11-16 Tatsuguchi Kogyo Glass Kk 除曇ガラス
WO2000053062A1 (en) * 1999-03-10 2000-09-14 Ardco, Inc. Display case with heated glass panel

Also Published As

Publication number Publication date
IT1315143B1 (it) 2003-02-03
ITUD20000205A1 (it) 2002-05-06
ATE327704T1 (de) 2006-06-15
DE60120080D1 (de) 2006-07-06
EP1203551A1 (de) 2002-05-08

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