EP0134090A1 - Appareil de chauffage - Google Patents

Appareil de chauffage Download PDF

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Publication number
EP0134090A1
EP0134090A1 EP84304671A EP84304671A EP0134090A1 EP 0134090 A1 EP0134090 A1 EP 0134090A1 EP 84304671 A EP84304671 A EP 84304671A EP 84304671 A EP84304671 A EP 84304671A EP 0134090 A1 EP0134090 A1 EP 0134090A1
Authority
EP
European Patent Office
Prior art keywords
infra
layer
heating apparatus
red
insulative material
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Withdrawn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
EP84304671A
Other languages
German (de)
English (en)
Inventor
John Kenneth Cosslett
Graham Howlett Goodchild
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.)
Thorn EMI Appliances Ltd
Original Assignee
Thorn EMI Appliances Ltd
Thorn EMI Domestic Appliances 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 Thorn EMI Appliances Ltd, Thorn EMI Domestic Appliances Ltd filed Critical Thorn EMI Appliances Ltd
Publication of EP0134090A1 publication Critical patent/EP0134090A1/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Withdrawn legal-status Critical Current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
    • H05B3/744—Lamps as heat source, i.e. heating elements with protective gas envelope, e.g. halogen lamps

Definitions

  • This invention relates to heating apparatus and in particular, though not exclusively, to such apparatus of the kind described in our copending European Application No.83307338.0 incorporating one or more sources of infra-red' radiation.
  • Heating apparatus of this kind consists of, in one example, a shallow tray member containing insulative material and supporting four infra-red-emitting tungsten-halogen lamps.
  • the tray member is mounted beneath a layer of glass ceramic, together with, say three similar trays so as to form a cooking hob.
  • the insulative material may be highly efficient at preventing heat dissipation from the apparatus, it may only absorb and re-radiate a limited amount of the infra-red radiation, so that it may be necessary to provide each of the lamps with a reflective coating on the underside thereof, thereby ensuring that infra-red radiation emitted in a downward direction from the filament is reflected back thereto in an upward direction, thereby preventing considerable dissipation of the infra-red radiation from the apparatus.
  • heating apparatus including at least one source of infra-red radiation disposed above, or partially embedded in, a layer of insulative material, said insulative material having been treated so as to cause it to be substantially impervious to infra-red radiation.
  • the insulative material is pref erably treated by application of an infra-red reflective coating to the surface thereof, or alternatively, by enriching a surface layer thereof with an infra-red reflective material.
  • the or each source of infra-red radiation preferably comprises a tubular tungsten-halogen lamp and the surface of the insulative material may have grooves provided therein to accommodate an underside portion of the surface area of each of the lamps, thereby causing infra-red radiation emitted in a downward direction from each filament to be reflected back partially theretowards and partially in an upward direction away from the insulative material.
  • a generally circular tray 1 preferably formed from metal, has disposed therewithin, on the base thereof, a layer 2 of a suitable insulative material.
  • the tray 1 has two extending flanges, 3 and 4, arranged on opposite sides of the rim thereof, which support respectively each end of a number of sources of infra-red radiation, one being shown at 5. In a preferred example, four sources are arranged across the circular area of the tray 1.
  • Each source 5 of infra-red radiation comprises a tmgsten-halogen lamp including a tungsten filament 7 supported within a quartz envelope 6, as described in co-pending European Application No.84301636.1 in the name of THORN EMI plc.
  • Each lamp has moulded ceramic end caps, 8 and 9, which each enclose a pinch seal (not shown) with an electrical lead connected to the respective end of the filament sealed therein, the lead being welded to an appropriate electrical connector.
  • a moulding 8 of ceramic fibre material is disposed above the tray 1 and press-fitted around the ends of each source 7 to provide a suitable packing therefor.
  • a thermal limiter (not shown) may also be provided within the apparatus to de-energise the lamps when a maximum operating temperature of the glass ceramic layer is reached, so as to prevent damage to the glass ceramic.
  • the limiter may be in the form of a metallic wire supported within a quartz tube, the wire being arranged to undergo thermal expansion to activate a mioroswitch, which causes de-energisation of the lamps, when the maximum temperature is reached.
  • a coiled nickel or silver foil may be disposed between the wire and the quartz tube. Once inside the tube, the coiled foil is allowed to expand to contact the inner surface of the tube.
  • Infra-red radiation directly from the lamps is transmitted through the wall of the quartz tube and reflected back by the foil, so that the wire remains insensitive to the radiation.
  • radiation, which has been absorbed by and re-radiated from the glass ceramic is of a different wavelength to that of the reflected radiation and is absorbed by the quartz tube.
  • the wire therefore becomes heated, and thus undergoes thermal ' expansion by thermal conduction from the tube.
  • the insulative material which is typically a microporous material, such as that known as Microtherm, may reflect only a limited amount of the infra-red radiation emitted in a downward direction from the lamps.
  • the present invention therefore provides, in one embodiment, a coating 12 of an infra-red reflective material, typically an oxide material, such as titanium dioxide.
  • the infra-red reflective material may be applied to the insulative material in any suitable form and by any suitable method, for example it may be formed into a finely divided slurry and sprayed onto the surface of the, insulative material, so as to cause the insulative material to be substantially impervious to incident infra-red radiation.
  • Figure 2 shows an alternative embodiment of the invention, wherein four infra-red lamps, 13 to 16 inclusive, each having a filament, 17 to 20, respectively, supported therein, are partly accommodated within linear grooves, 21 to 24, respectively, formed in the layer 2 of insulative material.
  • Each filament, 17 to 20 is thus situated at the focal - point of the semi-circular reflective surface formed in each grove by the reflective coating 12, so that infra-red radiation emitted from each filament, 17 to 20, in a downward direction, is reflected back theretowards, as well as some radiation being reflected up to the glass ceramic layer 11.
  • the layer 2 of the insulative material may be surface enriched with an infra-red reflective material, such as titanium dioxide, which acts as an opacifier for causing the insulative material to be substantially impervious to the infra-red radiation.
  • an infra-red reflective material such as titanium dioxide
  • any suitable infra-red material may be used to cause the insulative material to be impervious to a particular optical range, within which the lamps operate.
  • the present invention is therefore advantageous in that it provides heating apparatus incorporating an insulative material which is capable of reflecting infra-red radiation, as well as absorbing a certain amount thereof, which is subsequently re-radiated therefrom into the area of the heating apparatus, thereby substantially reducing the dissipation of infra-red radiation from the heating apparatus.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
EP84304671A 1983-08-12 1984-07-09 Appareil de chauffage Withdrawn EP0134090A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB838321717A GB8321717D0 (en) 1983-08-12 1983-08-12 Heating apparatus
GB8321717 1983-08-12

Publications (1)

Publication Number Publication Date
EP0134090A1 true EP0134090A1 (fr) 1985-03-13

Family

ID=10547195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84304671A Withdrawn EP0134090A1 (fr) 1983-08-12 1984-07-09 Appareil de chauffage

Country Status (3)

Country Link
EP (1) EP0134090A1 (fr)
JP (1) JPS6059689A (fr)
GB (1) GB8321717D0 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2565671A1 (fr) * 1984-06-09 1985-12-13 Micropore International Ltd Dispositif chauffant electrique, notamment pour cuisiniere electrique.
EP0169643A1 (fr) * 1984-06-28 1986-01-29 THORN EMI Patents Limited Appareil de chauffage
DE3503649A1 (de) * 1985-02-04 1986-08-07 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Strahlheizkoerper fuer kochgeraete mit einem hell- oder hochtemperatur-strahlungsheizelement
EP0211682A1 (fr) * 1985-08-16 1987-02-25 Micropore International Limited Radiateurs électriques comprenant une isolation thermique microporeuse
US4789772A (en) * 1985-06-11 1988-12-06 Micropore International Limited Infra-red heaters
US4835363A (en) * 1985-11-23 1989-05-30 Robert Krups Stiftung & Co. Kg. Electric steam iron heated by halogen lamp and having a ceramic sole plate
EP0412305A2 (fr) * 1989-08-07 1991-02-13 V.I.B. Apparatebau GmbH Dispositif pour le contrôle de l'épaisseur d'une bande passant par un interstice de pressage
WO1991003915A1 (fr) * 1989-08-31 1991-03-21 Electricity Association Services Limited Amenagement d'emission de rayonnement infrarouge
GB2255001A (en) * 1991-03-18 1992-10-28 Philips Nv Portable heating appliance
GB2257002A (en) * 1991-06-21 1992-12-23 Electrolux Cookers Ceramic electric hob
EP1306621A1 (fr) * 2001-10-29 2003-05-02 Nutri Pack Belgique S.A. Elément chauffant plan pour appareil de remise en température d'aliments

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3345498A (en) * 1965-02-01 1967-10-03 Gen Motors Corp Infrared surface heating unit
US3355574A (en) * 1965-10-01 1967-11-28 Gen Motors Corp Electrical surface heater with plural lamps
US3718497A (en) * 1970-11-19 1973-02-27 Gen Motors Corp Heater coil support

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3345498A (en) * 1965-02-01 1967-10-03 Gen Motors Corp Infrared surface heating unit
US3355574A (en) * 1965-10-01 1967-11-28 Gen Motors Corp Electrical surface heater with plural lamps
US3718497A (en) * 1970-11-19 1973-02-27 Gen Motors Corp Heater coil support

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4892997A (en) * 1984-06-09 1990-01-09 Micropore International Limited Electric heaters
FR2565671A1 (fr) * 1984-06-09 1985-12-13 Micropore International Ltd Dispositif chauffant electrique, notamment pour cuisiniere electrique.
EP0169643A1 (fr) * 1984-06-28 1986-01-29 THORN EMI Patents Limited Appareil de chauffage
DE3503649A1 (de) * 1985-02-04 1986-08-07 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Strahlheizkoerper fuer kochgeraete mit einem hell- oder hochtemperatur-strahlungsheizelement
US4910387A (en) * 1985-06-11 1990-03-20 Micropore International, Ltd. Infra-red heaters
US4789772A (en) * 1985-06-11 1988-12-06 Micropore International Limited Infra-red heaters
US4727241A (en) * 1985-08-16 1988-02-23 Micropore International Ltd. Radiant electric heaters incorporating microporous thermal insulation
EP0211682A1 (fr) * 1985-08-16 1987-02-25 Micropore International Limited Radiateurs électriques comprenant une isolation thermique microporeuse
US4835363A (en) * 1985-11-23 1989-05-30 Robert Krups Stiftung & Co. Kg. Electric steam iron heated by halogen lamp and having a ceramic sole plate
EP0412305A2 (fr) * 1989-08-07 1991-02-13 V.I.B. Apparatebau GmbH Dispositif pour le contrôle de l'épaisseur d'une bande passant par un interstice de pressage
EP0412305A3 (en) * 1989-08-07 1991-09-25 V.I.B. Apparatebau Gmbh Apparatus for controlling the thickness of a web passing through a press nip
WO1991003915A1 (fr) * 1989-08-31 1991-03-21 Electricity Association Services Limited Amenagement d'emission de rayonnement infrarouge
GB2255001A (en) * 1991-03-18 1992-10-28 Philips Nv Portable heating appliance
GB2255001B (en) * 1991-03-18 1995-03-22 Philips Nv Portable heating appliance
GB2257002A (en) * 1991-06-21 1992-12-23 Electrolux Cookers Ceramic electric hob
EP1306621A1 (fr) * 2001-10-29 2003-05-02 Nutri Pack Belgique S.A. Elément chauffant plan pour appareil de remise en température d'aliments

Also Published As

Publication number Publication date
GB8321717D0 (en) 1983-09-14
JPS6059689A (ja) 1985-04-06

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: THORN EMI APPLIANCES LIMITED

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19851114

RIN1 Information on inventor provided before grant (corrected)

Inventor name: GOODCHILD, GRAHAM HOWLETT

Inventor name: COSSLETT, JOHN KENNETH