EP0973356A2 - Elément de chauffage électrique rayonnant - Google Patents

Elément de chauffage électrique rayonnant Download PDF

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Publication number
EP0973356A2
EP0973356A2 EP99304950A EP99304950A EP0973356A2 EP 0973356 A2 EP0973356 A2 EP 0973356A2 EP 99304950 A EP99304950 A EP 99304950A EP 99304950 A EP99304950 A EP 99304950A EP 0973356 A2 EP0973356 A2 EP 0973356A2
Authority
EP
European Patent Office
Prior art keywords
heating element
shield member
terminal block
heater according
heater
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Withdrawn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
EP99304950A
Other languages
German (de)
English (en)
Other versions
EP0973356A3 (fr
Inventor
David Aubrey Plumptre
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.)
Ceramaspeed Ltd
Original Assignee
Ceramaspeed Ltd
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 Ceramaspeed Ltd filed Critical Ceramaspeed Ltd
Publication of EP0973356A2 publication Critical patent/EP0973356A2/fr
Publication of EP0973356A3 publication Critical patent/EP0973356A3/fr
Withdrawn legal-status Critical Current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 a radiant electric heater, particularly, but not exclusively, for use in cooking appliances.
  • the invention finds particular application to radiant electric heaters for use in glass-ceramic top cooking appliances and particularly, but not exclusively, to multiple zone heaters for use in such appliances.
  • Radiant electric heaters are well known in which one or more heating elements such as of wire or ribbon form are supported on a base of thermal and electrical insulation material, such as microporous thermal insulation material.
  • the insulation material may comprise or be included in a dish-like support and the one or more heating elements are generally arranged to be electrically connected to one or more terminal blocks provided on an outer edge of the support.
  • Multiple zone heaters are well known in which two or more heating elements are arranged in adjacent regions of a heater to provide two or more separate heating zones which may be separated by one or more walls of insulation material. Such two or more separate heating zones may be arranged concentrically, or arranged laterally in elongate forms of heater, such as multiple zone heaters of oval or elongate rectangular form.
  • a heating element in one zone may be arranged to be energised when a heating element in the other zone through which its terminal portions pass is not energised. This means that these terminal portions will exhibit visible radiance which is aesthetically undesirable, particularly when the heater is operated beneath a glass-ceramic cook top.
  • GB-A-2 324 946 describes an electrically insulating refractory component which has a portion received in an insulation base of a heater and a further portion overlying one or more terminal regions of a heating element to obscure visible radiance from the terminal regions of the heating element.
  • a disadvantage of this approach is that it requires a step of embedding a portion of the component into the insulation base to support the component.
  • a radiant electric heater comprising a dish-like support having therein at least one elongate electric heating element, a terminal block secured at an edge of the support, the terminal block comprising a body of electrically insulating material supporting one or more electrically conductive terminal members electrically connected to, or integral with, the at least one heating element, wherein the body has extending therefrom at least one shield member adapted to overlie at least one portion of the at least one heating element and reduce or minimise visibility of radiance therefrom.
  • the at least one shield member may also serve to dissipate heat from the at least one portion of the at least one heating element.
  • the at least one shield member may be integral with the body of the terminal block.
  • the at least one shield member may be of generally elongate form.
  • the at least one shield member may overlie at least one end portion of the at least one heating element.
  • the terminal block and the at least one shield member may comprise a refractory material such as a ceramic material.
  • a radiant electric heater 1 is provided for use beneath a glass-ceramic top (not shown) in a cooking appliance.
  • the heater 1 comprises a metal dish-like support 2 having therein a base 3 of compacted microporous thermal and electrical insulation material.
  • Heating element 4 is supported on the base 3 at a central region of the heater and heating element 5 surrounds the heating element 4 and is likewise supported on the base 3.
  • Heating elements 4 and 5 suitably comprise corrugated metal ribbons of well known form supported edgewise on the base 3 and secured by partial embedding in the base 3.
  • the heating elements 4 and 5 are separated by a circular wall 6 of thermal insulation material and a further circular wall 7 of thermal insulation material surrounds the heater at the periphery thereof.
  • a gap is provided between turns of the outer heating element 5 and a block 8 of thermal insulation material is located in this region between the inner wall 6 and the outer wall 7.
  • the block 8 is hollowed out inside to form a tunnel and a well known form of temperature limiter 9 passes through the tunnel and crosses the central heating element 4.
  • the limiter is therefore responsive only to the central heating element 4, being thermally isolated from the outer heating element 5 by means of the block 8.
  • a terminal block 10 is provided at the edge of the heater and the ends of the heating elements 4 and 5 are connected thereto. End portions 11, 12 of the central heating element 4 pass through the tunnel 8 and enter the area occupied by the outer heating element 5 before being connected to the terminal block 10.
  • the heating elements 4, 5 are arranged such that two heating zones 13, 14 are provided.
  • the central heating element 4 can be energised alone to provide heated zone 13 to heat a small cooking utensil located on an overlying glass-ceramic cook top (not shown).
  • Both heating elements 4 and 5 can also be energised together to provide heated zones 13 and 14, to heat a larger cooking utensil covering both zones on the overlying cook top.
  • the invention solves this problem in the following manner.
  • the terminal block 10 has a body 15 comprising an electrically insulating refractory material, suitably a ceramic material such as steatite or alumina. Integral with the body 15 and extending therefrom is a shield member 16 of generally elongate form which is arranged to overlie the end portions 11, 12 of the heating element 4 and obscure visible radiation from these end portions of the heating element when observed through the glass-ceramic cook top. Furthermore, since the shield member 16 and the integral body 15 of the terminal block are formed of a ceramic material having good thermal conductivity, heat from the end portions 11, 12 of the heating element 4 is able to be dissipated into the surroundings thereby preventing unacceptably high temperature from occurring in the end portions 11, 12 of the heating element 4 where overlain by the shield member 16.
  • the shield member primarily provides an elongate cover plate overlying the end portions of the heating element, but it may advantageously be provided with one or more depending side walls or flanges to increase the shielding effect thereof.
  • the shield member could be of elongate block form with one or more channels therein for accommodating one or more end portions 11, 12 of the heating element 4.
  • the body 15 of the terminal block 10 supports electrically conductive terminal members 17, electrically connected to, or integral with the heating elements 4, 5.
  • shield member 16 being formed integral with the body 15 of the terminal block, it could be formed separately and secured to the body 15.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Electric Stoves And Ranges (AREA)
EP99304950A 1998-07-08 1999-06-23 Elément de chauffage électrique rayonnant Withdrawn EP0973356A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9814686 1998-07-08
GB9814686A GB2339376A (en) 1998-07-08 1998-07-08 A radiant electric heater wherein a shield member overlies at least one portion of the element

Publications (2)

Publication Number Publication Date
EP0973356A2 true EP0973356A2 (fr) 2000-01-19
EP0973356A3 EP0973356A3 (fr) 2002-01-16

Family

ID=10835071

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99304950A Withdrawn EP0973356A3 (fr) 1998-07-08 1999-06-23 Elément de chauffage électrique rayonnant

Country Status (2)

Country Link
EP (1) EP0973356A3 (fr)
GB (1) GB2339376A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1143769A2 (fr) * 2000-04-03 2001-10-10 Ceramaspeed Limited Appareil de chauffage électrique
WO2002037898A1 (fr) * 2000-11-04 2002-05-10 Ceramaspeed Limited Ensemble radiateur electrique
EP1392081A2 (fr) * 2002-07-25 2004-02-25 Ceramaspeed Limited Radiateur électrique radiant
WO2004066679A1 (fr) * 2003-01-18 2004-08-05 Ceramaspeed Limited Appareil de chauffage electrique par rayonnement

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2361159B (en) * 2000-04-03 2004-11-03 Ceramaspeed Ltd Radiant electric heater

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2087698A (en) * 1980-11-17 1982-05-26 Micropore International Ltd Electric radiant heater unit
US4700051A (en) * 1984-09-22 1987-10-13 E.G.O. Elektro-Gerate Blanc U. Fischer Radiant heater for cooking appliances

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2324946B (en) * 1997-05-01 2001-03-14 Ceramaspeed Ltd Radiant electric heater

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2087698A (en) * 1980-11-17 1982-05-26 Micropore International Ltd Electric radiant heater unit
US4700051A (en) * 1984-09-22 1987-10-13 E.G.O. Elektro-Gerate Blanc U. Fischer Radiant heater for cooking appliances

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1143769A2 (fr) * 2000-04-03 2001-10-10 Ceramaspeed Limited Appareil de chauffage électrique
EP1143769A3 (fr) * 2000-04-03 2001-11-14 Ceramaspeed Limited Appareil de chauffage électrique
WO2002037898A1 (fr) * 2000-11-04 2002-05-10 Ceramaspeed Limited Ensemble radiateur electrique
GB2384153A (en) * 2000-11-04 2003-07-16 Ceramaspeed Ltd Electric heater assembly
GB2384153B (en) * 2000-11-04 2004-11-03 Ceramaspeed Ltd Electric heater assembly
EP1392081A2 (fr) * 2002-07-25 2004-02-25 Ceramaspeed Limited Radiateur électrique radiant
EP1392081A3 (fr) * 2002-07-25 2005-12-21 Ceramaspeed Limited Radiateur électrique radiant
EP1791397A2 (fr) * 2002-07-25 2007-05-30 Ceramaspeed Limited Dispositif de chauffage électrique par rayonnement
EP1791397A3 (fr) * 2002-07-25 2007-06-20 Ceramaspeed Limited Dispositif de chauffage électrique par rayonnement
WO2004066679A1 (fr) * 2003-01-18 2004-08-05 Ceramaspeed Limited Appareil de chauffage electrique par rayonnement

Also Published As

Publication number Publication date
GB2339376A (en) 2000-01-19
GB9814686D0 (en) 1998-09-02
EP0973356A3 (fr) 2002-01-16

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