EP0138314A1 - Heizapparat - Google Patents

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Publication number
EP0138314A1
EP0138314A1 EP84305327A EP84305327A EP0138314A1 EP 0138314 A1 EP0138314 A1 EP 0138314A1 EP 84305327 A EP84305327 A EP 84305327A EP 84305327 A EP84305327 A EP 84305327A EP 0138314 A1 EP0138314 A1 EP 0138314A1
Authority
EP
European Patent Office
Prior art keywords
heating apparatus
layer
infra
temperature sensing
operating temperature
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Withdrawn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
EP84305327A
Other languages
English (en)
French (fr)
Inventor
Stephen John Newton
David Wellcome
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 EP0138314A1 publication Critical patent/EP0138314A1/de
Withdrawn legal-status Critical Current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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/102—Tops, e.g. hot plates; Rings electrically heated
    • F24C15/105—Constructive details concerning the regulation of the temperature
    • 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
    • H05B3/746—Protection, e.g. overheat cutoff, hot plate indicator
    • 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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/04—Heating plates with overheat protection means

Definitions

  • 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 along with a number of similar members, is mounted beneath a layer of ceramic, so as to form a cooking hob.
  • the heating apparatus described in the afore-mentioned application includes a thermal limiter disposed in any suitable position beneath the glass ceramic.
  • the limiter consists of a metallic rod, which is adjusted to trip a microswitch when the maximum operating temperature of the glass ceramic is reached, so as to disconnect the power supply to the infra-red lamps.
  • thermal limiter may need to be minutely adjusted to avoid nuisance tripping of the microswitch and, in any case, integration of the temperature over the heated area of the glass ceramic may not be essential to implement sufficiently accurate monitoring of the operating temperature thereof.
  • heating apparatus including at least one source of infra-red radiation disposed below a layer of glass ceramic, characterised in that said apparatus includes temperature sensing means for monitoring the operating temperature of said layer and for producing an electrical signal substantially indicative of said operating temperature, and circuit means for de-energising said at least one source of infra-red radiation when said signal indicates an operating temperature substantially at or above a predetermined maximum value thereof.
  • the temperature sensing means may also be preferable to shield the temperature sensing means from incident infra-red radiation, emitted from the source or sources, by means such as a reflective coating or a ceramic fibre housing around the temperature sensing means.
  • 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, 3 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 tungsten-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 ple.
  • 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 10 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.
  • the tray 1 is urged upwardly, by a resiliently-mounted support plate (not shown), towards the undersurface of a layer 11 of glass ceramic, which forms the top surface of a cooking hob.
  • the present invention therefore provides an electronic temperature sensing device 12, which is preferably a thermocouple or alternatively a thermistor.
  • the device is preferably arranged so as to be in contact with, or closely adjacent to, the undersurface of the glass ceramic layer 11, so that the device 12 produces a signal indicative of the operating temperature of the undersurface of the layer 11.
  • a signal 13 produced by the device 12 is amplified in a differential manner by amplifier 14 and output 15, which is termperature compensated using a diode 16, is fed to a comparator 17, which compares the temperature compensated output 15 with an adjustable reference signal 18, which is indicative of the maximum operating temperature of the glass ceramic layer 11. If the signal 13 produced by the device 12 exceeds the reference signal 18, then the comparator 17 generates a signal 19, which actuates a triac 20, so as to disconnect the power supply to the filament of each of the lamps, thereby de-energising the lamps.
  • the device 12 may be preferable to shield the device 12 from incident infra-red radiation emitted from the lamps.
  • This may be implemented by accommodating the device within either a housing having a reflective coating thereon, such as a metallic oxide coating, or a housing fabricated from a ceramic fibre material.
  • Figures 3 and 4 which show two alternative embodiments of the present invention illustrate two other possible positions within the heating apparatus for the device 12, so that it is capable of monitoring the operating temperature of the glass ceramic layer 11.
  • Figure 3 shows the device 12 accommodated within a hollow 17 formed in the layer 2 of insulative material below the infra-red lamp
  • Figure 4 shows the device 12 disposed within the ceramic fibre moulding 10, so that the device is shielded from incident infra-red radiation, whilst maintaining thermal contact with the undersurface of the layer 11..
  • the present invention provides heating apparatus, incorporating one or more sources of infra-red radiation and including a substantially more reliable, compact and accurate thermal limiter than that utilised heretofore.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)
  • Electric Stoves And Ranges (AREA)
EP84305327A 1983-08-31 1984-08-06 Heizapparat Withdrawn EP0138314A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB838323387A GB8323387D0 (en) 1983-08-31 1983-08-31 Heating apparatus
GB8323387 1983-09-01

Publications (1)

Publication Number Publication Date
EP0138314A1 true EP0138314A1 (de) 1985-04-24

Family

ID=10548132

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84305327A Withdrawn EP0138314A1 (de) 1983-08-31 1984-08-06 Heizapparat

Country Status (6)

Country Link
EP (1) EP0138314A1 (de)
JP (1) JPS6070685A (de)
AU (1) AU3254984A (de)
DK (1) DK392184A (de)
GB (1) GB8323387D0 (de)
ZA (1) ZA846262B (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0308388A1 (de) * 1987-09-14 1989-03-22 Jules Lefevere Elektrisches Heizgerät
EP0379782A2 (de) * 1989-01-26 1990-08-01 Kabushiki Kaisha Toshiba Elektrisches Kochgerät
GB2228732A (en) * 1988-12-13 1990-09-05 Samsung Electronics Co Ltd Ceramic fibre material; halogen lamps
EP0471171A2 (de) * 1990-07-18 1992-02-19 Schott Glaswerke Vorrichtung zur Leistungssteuerung und -begrenzung bei einer Heizfläche aus Glaskeramik oder einem vergleichbaren Material
EP0586104A1 (de) * 1992-08-06 1994-03-09 POMPE DEVELOPMENTS LIMITED (In Liquidation), c/o WILFRED WYATT & CO Kochmulde
FR2706022A1 (fr) * 1993-06-01 1994-12-09 Jolly Marcel Appareil de cuisson avec son récipient.
WO1995016334A1 (en) * 1993-12-06 1995-06-15 Aktiebolaget Electrolux A device for determining the thermal load of a cooking zone
EP0786923A2 (de) * 1996-01-26 1997-07-30 AEG Hausgeräte GmbH Schaltungssystem für den Übertemperaturschutz der Glaskeramikplatte eines Kochfeldes
DE10356432A1 (de) * 2003-11-28 2005-06-23 E.G.O. Elektro-Gerätebau GmbH Temperatursensor auf Basis von Widerstandsmessung und Strahlungsheizkörper mit einem solchen Temperatursensor
US7417207B2 (en) 2005-02-01 2008-08-26 E.G.O. Elektro-Geraetebau Gmbh Heating device with temperature sensor and hob with heating devices

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3355574A (en) * 1965-10-01 1967-11-28 Gen Motors Corp Electrical surface heater with plural lamps
US3646321A (en) * 1970-06-22 1972-02-29 Gen Motors Corp Infrared surface heating unit
DE2203661A1 (de) * 1972-01-27 1973-08-02 Siemens Elektrogeraete Gmbh Kochplatte
AT312759B (de) * 1972-01-19 1974-01-25 Elektra Bregenz Gmbh Einrichtung zum thermischen Behandeln von Koch- und/oder Bratgut
DE2608295A1 (de) * 1976-02-28 1977-09-08 Bbc Brown Boveri & Cie Elektronischer temperaturregler ueber die energiezufuhr fuer ein elektrisches heizelement
JPS56124838A (en) * 1980-03-06 1981-09-30 Toshiba Corp Microwave oven

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3355574A (en) * 1965-10-01 1967-11-28 Gen Motors Corp Electrical surface heater with plural lamps
US3646321A (en) * 1970-06-22 1972-02-29 Gen Motors Corp Infrared surface heating unit
AT312759B (de) * 1972-01-19 1974-01-25 Elektra Bregenz Gmbh Einrichtung zum thermischen Behandeln von Koch- und/oder Bratgut
DE2203661A1 (de) * 1972-01-27 1973-08-02 Siemens Elektrogeraete Gmbh Kochplatte
DE2608295A1 (de) * 1976-02-28 1977-09-08 Bbc Brown Boveri & Cie Elektronischer temperaturregler ueber die energiezufuhr fuer ein elektrisches heizelement
JPS56124838A (en) * 1980-03-06 1981-09-30 Toshiba Corp Microwave oven

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, unexamined applications, Section M, vol. 6, no. 1, January 7, 1982 THE PATENT OFFICE JAPANESE GOVERNMENT page 79 M 105 & JP-A-56-124 838 (tokyo shibaura) *

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0308388A1 (de) * 1987-09-14 1989-03-22 Jules Lefevere Elektrisches Heizgerät
GB2228732B (en) * 1988-12-13 1993-05-12 Samsung Electronics Co Ltd A light insulative reflecting material and a preparing method thereof
GB2228732A (en) * 1988-12-13 1990-09-05 Samsung Electronics Co Ltd Ceramic fibre material; halogen lamps
EP0379782A2 (de) * 1989-01-26 1990-08-01 Kabushiki Kaisha Toshiba Elektrisches Kochgerät
EP0379782A3 (de) * 1989-01-26 1991-10-09 Kabushiki Kaisha Toshiba Elektrisches Kochgerät
US5352864A (en) * 1990-07-18 1994-10-04 Schott Glaswerke Process and device for output control and limitation in a heating surface made from glass ceramic or a comparable material
EP0471171A3 (en) * 1990-07-18 1992-08-05 Schott Glaswerke Method and device for regulating and limiting the power of a heating plate made of ceramic or similar material
EP0471171A2 (de) * 1990-07-18 1992-02-19 Schott Glaswerke Vorrichtung zur Leistungssteuerung und -begrenzung bei einer Heizfläche aus Glaskeramik oder einem vergleichbaren Material
EP0586104A1 (de) * 1992-08-06 1994-03-09 POMPE DEVELOPMENTS LIMITED (In Liquidation), c/o WILFRED WYATT & CO Kochmulde
US5425353A (en) * 1992-08-06 1995-06-20 Pompe Developments Limited (In Liquidation) Cooking hobs
FR2706022A1 (fr) * 1993-06-01 1994-12-09 Jolly Marcel Appareil de cuisson avec son récipient.
WO1995016334A1 (en) * 1993-12-06 1995-06-15 Aktiebolaget Electrolux A device for determining the thermal load of a cooking zone
EP0786923A2 (de) * 1996-01-26 1997-07-30 AEG Hausgeräte GmbH Schaltungssystem für den Übertemperaturschutz der Glaskeramikplatte eines Kochfeldes
EP0786923A3 (de) * 1996-01-26 1998-01-07 AEG Hausgeräte GmbH Schaltungssystem für den Übertemperaturschutz der Glaskeramikplatte eines Kochfeldes
DE10356432A1 (de) * 2003-11-28 2005-06-23 E.G.O. Elektro-Gerätebau GmbH Temperatursensor auf Basis von Widerstandsmessung und Strahlungsheizkörper mit einem solchen Temperatursensor
US7569798B2 (en) 2003-11-28 2009-08-04 E.G.O. Elektro-Geraetebau Gmbh Temperature sensor based on resistance measurement and radiant heater with such a temperature sensor
US7417207B2 (en) 2005-02-01 2008-08-26 E.G.O. Elektro-Geraetebau Gmbh Heating device with temperature sensor and hob with heating devices

Also Published As

Publication number Publication date
GB8323387D0 (en) 1983-10-05
ZA846262B (en) 1985-06-26
DK392184A (da) 1985-03-02
DK392184D0 (da) 1984-08-15
JPS6070685A (ja) 1985-04-22
AU3254984A (en) 1985-03-07

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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

17P Request for examination filed

Effective date: 19850528

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

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19860225

RIN1 Information on inventor provided before grant (corrected)

Inventor name: WELLCOME, DAVID

Inventor name: NEWTON, STEPHEN JOHN