EP2365729A1 - Electrical radiant heater adapted to a cooking hob plate - Google Patents

Electrical radiant heater adapted to a cooking hob plate Download PDF

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Publication number
EP2365729A1
EP2365729A1 EP11382060A EP11382060A EP2365729A1 EP 2365729 A1 EP2365729 A1 EP 2365729A1 EP 11382060 A EP11382060 A EP 11382060A EP 11382060 A EP11382060 A EP 11382060A EP 2365729 A1 EP2365729 A1 EP 2365729A1
Authority
EP
European Patent Office
Prior art keywords
radiant heater
casing
heater according
electrical radiant
insulating base
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.)
Withdrawn
Application number
EP11382060A
Other languages
German (de)
English (en)
French (fr)
Inventor
Daniel De los Toyos López
Francisco Javier Caballero Olaortua
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 EP2365729A1 publication Critical patent/EP2365729A1/en
Withdrawn legal-status Critical Current

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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 electrical radiant heater adapted to a cooking hob plate, in particular of a glass-ceramic cooker.
  • the prior art contains known electrical radiant heaters adapted to a cooking hob plate, which comprise a substantially cylindrical insulating base on which is fixed at least one heating resistance, an insulating ring that is arranged supported on the insulating base and on which is supported the cooking hob, and reinforcement means in the form of a metal casing that houses the insulating base in its interior and, partially, the insulating ring, the metal casing being a support for a temperature-limiting device and a connection terminal, as disclosed in document DE1 02006045451 A1 .
  • the reinforcement means include at least one strip that extends all along the insulating base, the opposite ends of the strip being arranged extended, at least partially, on the side wall of the insulating base.
  • the radiant heater described herein preferably includes two strips that are arranged substantially orthogonal to each other, supporting the insulating base.
  • the object of this invention is to provide an electrical radiant heater adapted to a cooking hob plate, in particular of a glass-ceramic cooker, as defined in the claims.
  • the electrical radiant heater comprises at least one resistance, an insulating base on which is fixed the resistance, an insulating ring arranged supported on the insulating base and on which is arranged supported the cooking hob plate, and a casing in the interior of which is housed the insulating base and at least partially the insulating ring.
  • the casing has a bottom surface that includes an opening, with the result that the conduction of heat between the insulating base and the casing is reduced, as the opposing surface between said insulating base and the bottom surface is reduced.
  • the weight of the casing is reduced, a radiant heater with a high insulation capacity and of minimal cost being obtained, thanks to the optimised shape of the casing, which enables its repetitive manufacturing.
  • Figures 1 to 3 show an electrical radiant heater 1 according to the invention, adapted to a cooktop 2, the radiant heater 1 comprising a substantially revolving insulating base 3 that has a substantially flat upper surface 3a on which is fixed one or more heating resistances 4, an insulating ring 6 that is supported on the upper surface 3a of the insulating base 3 and which comes into contact with the inner surface of the cooktop 2, and the casing 5 adapted to the outer shape of the insulating base 3 and to the insulating ring 6, the casing 5 housing in its interior said insulating base 3 and, partially, said insulating ring 6.
  • the electrical radiant heater 1 also comprises a temperature-limiting device, not shown in the figures, that passes, at least partially, through the insulating base 3 over the resistances 4, and a connection terminal, not shown in the figures, through which the resistances are connected to the supply, the connection terminal being fixed to the casing 5.
  • the casing 5 includes a substantially circular bottom surface 5c, a substantially horizontal ring-shaped outer rim 5b that projects out in relation to the bottom surface 5c, and a substantially vertical wall 5a that extends from the outer rim 5b at a height greater than the thickness H of the insulating base 3.
  • the insulating base 3 includes a substantially flat and circular lower surface 3b that is arranged facing the bottom surface 5c, and an intermediate surface 3c that is substantially ring-shaped and substantially parallel to the upper surface 3a and to the lower surface 3b and which is arranged supported on the rim 5b of the casing 5.
  • the bottom surface 5c of the casing 5 includes a substantially circular opening 8, arranged substantially concentric to the bottom surface 5c, with the result that the bottom surface 5c facing the insulating base 3 is reduced.
  • the diameter D1 of the opening 8 is at least approximately three-fifths the diameter D2 of the back surface 5c.
  • the casing 5 is made of a metal material, preferably galvanised sheet metal or sheet aluminium. Thanks to the opening 8 in the bottom surface 5c, the conduction of heat between the insulating base 3 and the casing 5 is minimized, as the opposing surface between said insulating base 3 and the bottom surface is reduced 5c, thereby reducing the heat bridge between the bottom surface 5c and the wall 5a.
  • the excess material may be used to manufacture a radiant heater 1 of a smaller diameter, thereby bringing about a significant reduction in material and manufacturing costs.
  • the radiant heater 1 also comprises a cover 7 that is arranged supported on the bottom surface 5c, closing the opening 8.
  • a cover 7 that is arranged supported on the bottom surface 5c, closing the opening 8.
  • the cover 7 is made of a plastic material that has a melting temperature greater than approximately 300oC, good dimensional stability, and is flame retardant, the plastic material preferably being a liquid crystal polymer preferably with a 30% fibre volume.
  • cover 7 may be built into the casing 5 itself to form a single piece, either by injection on the casing 5 or by other known means.
  • the casing 5 may be made of a plastic material that has a melting temperature greater than approximately 300oC, good dimensional stability, and is flame retardant.
  • the plastic material is a liquid crystal polymer with a 30% fibre volume, which also enables the injection of pieces with thin thicknesses, with the result that the volume of the casing 5 does not increase comparatively in relation to a casing 5 made of sheet metal.
  • the radiant heater 1 may include a cover 7 made of a metal material, preferably sheet metal.
  • the cover 7 is arranged on the back surface 5c of the casing 5.
  • the cover 7 may be built into the casing 5 itself to form a single piece.
  • the cover 7 is included, it is possible to manufacture radiant heaters 1 of high diameters, wherein the insulating base 3 is conformed along with the casing 5.
  • the insulating base 3 is made by moulding of a single layer of uniform, microporous material providing good heat insulation, good mechanical properties and resistant to the absorption of moisture, which comprises a silica aerogel powder mixed with fibre-reinforced ceramic, optionally opacifying materials and ceramic loads.
  • the insulating ring 6 is made of an insulating material providing good mechanical properties and high temperature resistance.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
EP11382060A 2010-03-10 2011-03-08 Electrical radiant heater adapted to a cooking hob plate Withdrawn EP2365729A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES201030209U ES1072062Y (es) 2010-03-10 2010-03-10 Foco radiante electrico adaptado a una placa de coccion

Publications (1)

Publication Number Publication Date
EP2365729A1 true EP2365729A1 (en) 2011-09-14

Family

ID=42123215

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11382060A Withdrawn EP2365729A1 (en) 2010-03-10 2011-03-08 Electrical radiant heater adapted to a cooking hob plate

Country Status (2)

Country Link
EP (1) EP2365729A1 (es)
ES (1) ES1072062Y (es)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2915529A1 (de) * 1979-04-18 1980-11-06 Thielmann Ag Kg Geb Einbau-kochfeld
US4794233A (en) * 1986-10-17 1988-12-27 E.G.O. Elektro-Gerate Blanc U. Fischer Radiant heater
US5001328A (en) * 1986-02-26 1991-03-19 E.G.O. Eleckro-Gerate Blanc U. Fischer Cooking unit with radiant heaters
EP1022930A2 (en) 1999-01-22 2000-07-26 Ceramaspeed Limited Constituting elements of radiant electric heater
DE102006045451A1 (de) 2006-09-19 2008-03-27 E.G.O. Elektro-Gerätebau GmbH Wärmedämmformkörper und Verfahren zur Herstellung eines Wärmedämmformkörpers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2915529A1 (de) * 1979-04-18 1980-11-06 Thielmann Ag Kg Geb Einbau-kochfeld
US5001328A (en) * 1986-02-26 1991-03-19 E.G.O. Eleckro-Gerate Blanc U. Fischer Cooking unit with radiant heaters
US4794233A (en) * 1986-10-17 1988-12-27 E.G.O. Elektro-Gerate Blanc U. Fischer Radiant heater
EP1022930A2 (en) 1999-01-22 2000-07-26 Ceramaspeed Limited Constituting elements of radiant electric heater
DE102006045451A1 (de) 2006-09-19 2008-03-27 E.G.O. Elektro-Gerätebau GmbH Wärmedämmformkörper und Verfahren zur Herstellung eines Wärmedämmformkörpers

Also Published As

Publication number Publication date
ES1072062Y (es) 2010-08-09
ES1072062U (es) 2010-05-13

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