EP2073601B1 - Elektrischer Strahlungsheizer - Google Patents

Elektrischer Strahlungsheizer Download PDF

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Publication number
EP2073601B1
EP2073601B1 EP20080382072 EP08382072A EP2073601B1 EP 2073601 B1 EP2073601 B1 EP 2073601B1 EP 20080382072 EP20080382072 EP 20080382072 EP 08382072 A EP08382072 A EP 08382072A EP 2073601 B1 EP2073601 B1 EP 2073601B1
Authority
EP
European Patent Office
Prior art keywords
insulating base
face
radiant heater
electric radiant
support cover
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 - Fee Related
Application number
EP20080382072
Other languages
English (en)
French (fr)
Other versions
EP2073601A3 (de
EP2073601A2 (de
Inventor
Daniel De los Toyos López
Enaitz López Berriozabalgoitia
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.)
Eika SCL
Original Assignee
Eika SCL
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 Eika SCL filed Critical Eika SCL
Publication of EP2073601A2 publication Critical patent/EP2073601A2/de
Publication of EP2073601A3 publication Critical patent/EP2073601A3/de
Application granted granted Critical
Publication of EP2073601B1 publication Critical patent/EP2073601B1/de
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater

Definitions

  • This invention relates to an electric radiant heater adapted to a cooking hob, in particular a glass-ceramic cooktop.
  • Electric radiant heaters adapted to a cooking hob are know in the prior art, and which comprise a metal support cover that houses in its interior an insulating base that includes a perimeter rim and upon which is fixed at least one thermal conductor, said support cover including a support projection that projects out in relation to its base, as disclosed in documents ES 1054629U and EP 1139696A .
  • the insulating base is made of a thermal insulating material obtained by compression, which comprises a micro-porous silica aerogel reinforced with ceramic fibres and, optionally, alumina and an opacifier, with the result that said insulating base has good mechanical and thermal insulation properties, as disclosed in document GB 1580909 A .
  • the insulating base In general terms, the insulating base, the faces of which are substantially flat, is supported on the support projection of the support cover via the perimeter rim, whereas in the bottom surface, generally convex, of the support cover, there is a non-uniform gap between the insulating base and the bottom of said support cover.
  • the insulating base is supported on the bottom of the support cover, comprising said insulating base several holes and comprising the bottom of the support cover several holes communicated with the corresponding holes of the insulating base, so that the moisture absorbed by said insulating base can be driven out.
  • the object of this invention is to provide an electric radiant heater adapted to a cooking hob, in particular a glass-ceramic cooktop, as defined in the claims.
  • the electric radiant heater of the invention comprises an insulating base that has, on one end, a substantially flat and circular first face upon which at least one heating resistance is fixed, and, on the opposite end, a substantially circular second face, and a metal support cover that houses said insulating base in its interior.
  • the second face of the insulating base is supported directly on the bottom surface of the support cover via a contact surface comprised in the second face, the area of said contact surface being smaller than the area of the circle delimited by the second face of said insulating base and than the area of the bottom surface facing said second face.
  • an electric radiant heater adapted to a cooking hob, not shown in the figures, comprises a substantially revolving insulating base 2 that has, on one end, a substantially flat and circular first face 2a upon which are fixed one or more heating resistances, not shown in the figures, and on the opposite end, a substantially flat and circular second face 2b defined by a diameter D1, and a metal support cover 3 adapted to the external shape of the insulating base 2, which houses said insulating base 2 in its interior.
  • the support cover 3 has a substantially vertical wall 3b of a height greater than a thickness H2 of the insulating base 2 and a bottom surface 3a, and the second face 2b of the insulating base 2 comprises a contact surface 10, being supported directly the insulating base 2 upon the bottom surface 3a of the support cover 3 through the contact surface 10, the area of said contact surface 10 being smaller than the area of the circle of diameter D1 delimited by the second face 2b, and than the area of the bottom surface 3a facing the second face 2b of the insulating base 2.
  • the insulating base 2 is formed by moulding a single layer of uniform micro-porous material, a good heat-insulating material with good mechanical properties and resistant to the absorption of moisture, which comprises a silica aerogel dust mixed with ceramic-reinforcing fibres, and, optionally, opacifying materials and ceramic loads.
  • the insulating base 2 includes a plurality of holes 6, symmetrically disposed on the second face 2b, which reduce the area of the contact surface 10 of said second face 2b in contact with the bottom surface 3a, and create layers of insulating air between the insulating base 2 and the support cover 3.
  • the holes 6 are blind holes defined by a height H1, which is smaller than the thickness H2 of the insulating base 2.
  • the insulating base 2 comprises a first substantially cylindrical element 4, one of the two faces of which corresponds to the first face 2a of the insulating base 2, and a second substantially cylindrical element 5, one of the two faces of which corresponds to the second face 2b of the insulating base 2, said first element 4 and second element 5 being coaxial and said first element 4 being supported on the second element 5.
  • the first element 4 is formed by moulding a single layer of uniform micro-porous material, a good heat-insulating material with good mechanical properties and resistant to the absorption of moisture, which comprises a silica aerogel dust mixed with ceramic-reinforcing fibres and, optionally, opacifying materials and ceramic loads, while the second element 5 is made of a material with good mechanical properties, such as alumina, steatite, cordierite or a similar material.
  • the second element 5 includes a plurality of corresponding holes 7, symmetrically disposed in a beehive panel arrangement, said holes 7 being through-holes, and which reduce the area of the contact surface 10 of the insulating base 2 in contact with the support cover 3, and create air cavities that improve the insulation between the insulating base 2 and the support cover 3.
  • the support cover 3 includes projections 8 towards the interior of the support cover 3, made by means of a stamping procedure, and upon which the contact surface 10 of the insulating base 2 is supported, thereby reducing the contact between the insulating base 2 and the support cover 3.
  • the projections 8 may have varying shapes, being capable of taking the form of a matrix of individual projections, of rectilinear channels or concentric circular channels.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Electric Stoves And Ranges (AREA)

Claims (6)

  1. Elektrischer Strahlungsheizer, der auf ein Kochfeld angepasst ist, insbesondere ein Glas-Keramik-Kochfeld, das eine isolierende Basis (2) umfasst, die, auf einem Ende, eine im Wesentlichen flache und runde erste Seite (2a) aufweist, auf der mindestens ein Heizwiderstand befestigt ist, und, auf einem gegenüber liegenden Ende, eine im Wesentlichen runde zweite Seite (2b), und eine Metallträgerabdeckung (3), die die isolierende Basis (2) in ihrem Inneren aufnimmt, dadurch gekennzeichnet, dass die zweite Seite (2b) der isolierenden Basis (2) eine Kontaktfläche (10) aufweist, durch die die isolierende Basis (2) direkt auf einer unteren Fläche (3a) der Trägerabdeckung (3) getragen wird, wobei der Bereich der Kontaktfläche (10) kleiner als der Bereich des Kreises ist, der von der zweiten Seite (2b) der isolierenden Basis (2) begrenzt wird, und als der Bereich der unteren Fläche (3a), die der zweien Seite (2b) gegenüber liegt.
  2. Elektrischer Strahlungsheizer nach dem vorhergehenden Anspruch, wobei die isolierende Basis (2) eine Vielzahl von Löchern (6, 7) umfasst, die auf der zweiten Seite (2b) angeordnet sind, wodurch die Kontaktfläche (10) reduziert wird.
  3. Elektrischer Strahlungsheizer nach dem vorhergehenden Anspruch, wobei die Löcher (6, 7) symmetrisch angeordnet sind und eine Tiefe (H1) aufweisen, die geringer als die Dicke (H2) der isolierenden Basis (2) ist.
  4. Elektrischer Strahlungsheizer nach einem der Ansprüche 2 oder 3, wobei die isolierende Basis (2) ein erstes Element (4) umfasst, von dem eine der zwei Seiten der ersten Seite (2a) der isolierenden Basis (2) entspricht, und ein zweites Element (5), von dem eine der zwei Seiten der zweiten Seite (2b) der isolierenden Basis (2) entspricht, wobei das erste Element (4) und das zweite Element (5) koaxial sind, wobei das erste Element (4) auf dem zweiten Element (5) getragen wird, wobei die Löcher(7), bei denen es sich um Durchgangslöcher handelt, symmetrisch im zweiten Element (5) angeordnet sind.
  5. Elektrischer Strahlungsheizer nach einem der vorhergehenden Ansprüche, wobei die untere Fläche (3a) Vorsprünge (8) umfasst, auf denen die Kontaktfläche (10) getragen wird.
  6. Elektrischer Strahlungsheizer nach dem vorhergehenden Anspruch, wobei die Vorsprünge (8) mit Hilfe eines Stanzverfahrens erhalten werden.
EP20080382072 2007-12-21 2008-12-04 Elektrischer Strahlungsheizer Expired - Fee Related EP2073601B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES200702652U ES1066972Y (es) 2007-12-21 2007-12-21 Foco radiante electrico

Publications (3)

Publication Number Publication Date
EP2073601A2 EP2073601A2 (de) 2009-06-24
EP2073601A3 EP2073601A3 (de) 2009-08-26
EP2073601B1 true EP2073601B1 (de) 2015-03-25

Family

ID=39168027

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080382072 Expired - Fee Related EP2073601B1 (de) 2007-12-21 2008-12-04 Elektrischer Strahlungsheizer

Country Status (2)

Country Link
EP (1) EP2073601B1 (de)
ES (2) ES1066972Y (de)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2205132C3 (de) * 1972-02-03 1980-09-04 E.G.O. Elektro-Geraete Blanc U. Fischer, 7519 Oberderdingen Elektrokochgerät
GB1580909A (en) 1977-02-10 1980-12-10 Micropore Internatioonal Ltd Thermal insulation material
DE3034495A1 (de) * 1980-09-12 1982-03-25 Grünzweig + Hartmann und Glasfaser AG, 6700 Ludwigshafen Vorrichtung zur waermedaemmung einer waermequelle
DE3810586A1 (de) * 1988-03-29 1989-10-12 Ego Elektro Blanc & Fischer Beheizung fuer elektrische kochgeraete
DE19919784A1 (de) 1999-04-30 2000-11-02 Diehl Ako Stiftung Gmbh & Co Aufnahmeschale mit einer Isolierschicht für Strahlungsheizelemente und Verfahren zur Herstellung von Kanälen in der Isolierschicht
GB2360683B (en) 2000-03-23 2004-11-10 Ceramaspeed Ltd Radiant electric heater
ES1054629Y (es) 2003-04-25 2003-12-01 Eika S Coop "foco radiante para una placa de cocina con un aro aislante"

Also Published As

Publication number Publication date
EP2073601A3 (de) 2009-08-26
ES1066972Y (es) 2008-07-01
ES2533905T3 (es) 2015-04-15
ES1066972U (es) 2008-04-01
EP2073601A2 (de) 2009-06-24

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