EP0866641A2 - Plaque de cuisson électrique - Google Patents

Plaque de cuisson électrique Download PDF

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Publication number
EP0866641A2
EP0866641A2 EP98104448A EP98104448A EP0866641A2 EP 0866641 A2 EP0866641 A2 EP 0866641A2 EP 98104448 A EP98104448 A EP 98104448A EP 98104448 A EP98104448 A EP 98104448A EP 0866641 A2 EP0866641 A2 EP 0866641A2
Authority
EP
European Patent Office
Prior art keywords
hotplate
underside
metal foil
heating
electric
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Withdrawn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
EP98104448A
Other languages
German (de)
English (en)
Other versions
EP0866641A3 (fr
Inventor
Josef Dipl.-Ing. Hecht (Fh)
Roman-Hartmut Wauer
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.)
Diehl AKO Stiftung and Co KG
Original Assignee
AKO Werke GmbH and Co KG
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 AKO Werke GmbH and Co KG filed Critical AKO Werke GmbH and Co KG
Publication of EP0866641A2 publication Critical patent/EP0866641A2/fr
Publication of EP0866641A3 publication Critical patent/EP0866641A3/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Withdrawn legal-status Critical Current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

  • the invention relates to an electric hotplate with a hotplate body a flat surface and a heating arranged on its underside, according to the preamble of claim 1.
  • a so-called plate made of high-performance ceramic for example from silicon carbide or silicon nitride, which is manufactured in a highly insulating manner.
  • This can eliminate an air gap because the high-performance ceramics conduct the heat so well that the operating temperature is already 250 ° C also sufficient for a cooking process and the ceramic in this temperature range does not conduct the electrical current. Due to the low operating temperature of 250 ° C, the cooking process can only be done with special pots that also have a ceramic floor, can be used optimally. Also own these high performance ceramics do not have directional heat conduction, i.e. the Longitudinal and transverse heat conduction is equally good. So the cooking zone can not be thermally delimited as with a glass ceramic plate.
  • DE 38 27 073 A1 discloses an electric hotplate of the generic type with a hotplate body and a heating arranged on its underside, which has an electrical heating resistor.
  • This heating is as flat, paper-like or sandwich-like layer made of a heat-resistant material formed with an electrical resistance element arranged therein and is in contact with the underside of the part of the hotplate body to be heated.
  • the hotplate body is alternatively made of gray cast iron, a shaped stainless steel or made from a sintered material. The heating is against the bottom of the hotplate body glued. Furthermore, the heating can thereby the bottom of the hotplate body are pressed into the lower cavity a filler with liquid-like properties is used, which by is closed at the bottom by an end cover.
  • the metal foil With a smooth underside of the hotplate body formed from glass ceramic the metal foil is pressed over the entire surface. With a nubbed underside of the Glass ceramic existing hotplate body is between the metal foil and a very good temperature-conducting adhesive is used on the underside.
  • Another essential feature of the invention is seen in the fact that one of the electrical insulation dependent limit temperature is observed so that any thermally highly conductive material can be used as a cooking zone cover can by maintaining the maximum temperature at which an inserted Material just has its electrical insulation resistance properties owns. The temperature is increased automatically above the limit temperature, if bad parboiling values are achieved. Doing so simultaneously and automatically an increase in the air gap between the bottom of the Hotplate body and the metal foil introduced to even at higher temperatures to be electrically insulating.
  • the electric hotplate 11 has a hotplate body 1 made of a glass ceramic (Ceran), which is formed with a flat surface 12 on which a cooking vessel 13 is set up with the food. Usually four hot plates of different sizes and with the expansion of a roasting pan by a hotplate body 1 completely covered.
  • the underside 14 of the hotplate body 1 can be flat or be nubbed. In the example of Figure 1 is from a flat bottom 14 of the hotplate body 1.
  • a heater in the form of a metal foil 3 in direct Contact is applied flatly and is supported by an insulating body 4.
  • the insulating body 4 is made of a heat insulating and electrically non-conductive material and is produced with suitable means pressed flat against the metal foil 3 from below.
  • suitable means for holding the insulating body 4 as a support element for the metal foil 3 can according to Figures 2 and 4 serve a bowl 5 below. It is theoretical but also conceivable to attach other support elements and even screw connections.
  • the insulating body 4 in FIG. 1 is made of a thermally and electrically insulating, rigid and essentially inelastic compact formed. Instead of one pressed insulating body 4 is also a filament mat or another insulating body can be used with spring properties, on the one hand for a full-surface Attachment to the metal foil are suitable and on the other hand at higher temperatures expand in addition.
  • the heating is in the form of a metal foil 3 (Foil heating element, heating conductor) in turn directly on the underside 14 of the hotplate body 1, which is also a glass ceramic plate (Ceran) in this example.
  • the metal foil 3 is pressed against the underside 14 by a cushion 7 made of an elastic material which is filled with air in the inner cavity, Liquid, gel, granular spheres or the like mass is filled.
  • the pillow 7 is carried by a holder drop 5 and in the pressing position under the Metal foil 3 held.
  • the elastic cushion over its entire pressure surface is optimally suitable for pressing against the metal foil in a goose area Format.
  • Hotplate body 1 glass ceramic
  • Adhesive or an adhesive layer 2 with high electrical insulation and thermal good conductivity can be used.
  • the thermal resistance of this adhesive layer 2 is very small compared to the hotplate body 1, so that the adhesive layer 2 does not act as a thermal insulator.
  • the glass ceramic surface is regularly smooth, while its underside 14 is usually napped. This knot on the underside 14 of the glass ceramic increases their mechanical stability under impact stress. It affects however disturbing in the intimate connection of the heating conductor 3 to the underside 14 the glass ceramic. For this reason too, it can be used for insulating glass-ceramic materials the hotplate body 1 may be necessary, an adhesive layer or an adhesive 2 to compensate for the knobs on the underside 14 of the hotplate body 1 to apply. This adhesive layer 2 then also acts as an intermediary with different expansion coefficients of the materials used for the hotplate body and the heating conductor.
  • the metal foil 3 in the adhesive layer or be introduced can also be used in a subsequent one second adhesive layer can be partially or completely embedded. This too second adhesive layer must then also be very good heat conductor. Dependent on the existing insulation can be the electrical insulation property of the second Adhesive layer will then be less.
  • FIGs 4 are examples of an electric hot plate with wave-like shaped metal foil 16 used for heating.
  • the top and the hotplate body 1 facing wave crests are each in an adhesive layer 2 is embedded, which is on the underside 14 of the hotplate body 1 is located.
  • a further adhesive layer 17 inserted, among others also to compensate for unevenness on the underside, for example Pimples, serve.
  • This second adhesive 17 has very good electrical properties insulating and heat-conducting properties.
  • Figure 4 are the lower troughs the wave-shaped metal foil 16 is molded into the insulating body 6.
  • the surface of the insulating body 6 is in each case on the undersides of the facing Metal foil 16 and partially on the adhesive layer 2.
  • Figure 5 shows Figure 5 that the lower trough of the metal foil 16 on the in the holder drip 5 lie flat insulating body 18.
  • Sensors monitor when cooking or operating the electric hotplate the temperature of the hotplate body 1 and / or the temperature of the heating conductor 3, 16, if this is directly proportional to the glass ceramic temperature. If the Heating conductor 3, 16 abuts intimately on the underside of the hotplate body 1, a Limit temperature set at which the necessary electrical insulation properties can be guaranteed. This temperature represents the maximum limit temperature The control can now, depending on the preselection of the operator Increase energy accordingly until this limit temperature is reached.
  • FIG. 7 another embodiment is shown, in which Specifying an air gap 9 between the bottom 14 of the hotplate body 1 and the heating conductor 3 can be inserted.
  • the heating conductor 3 is supplemented by a mechanism that is connected to a upstream control sets the limit temperature depending on its position.
  • This regulation must now automatically the temperature changes per Monitor the unit of time and, in the event of rapid changes, information about the system change submit.
  • data can be, for example: bad pot, bad container, good pot etc.
  • the insulating effect of the air gap depends of the size of the gap 9.
  • the Mechanics now dynamically change the air gap and a desired limit temperature to adjust.
  • the insulating body 8 along the guide webs 9 regulated according to arrow 19 upwards or downwards.
  • the heating conductor 3 in one end position directly below the bottom of the Hotplate body 1, while it is optimal in the other end position Air gap 9 between its surface and the underside 14 of the hotplate body 1 takes.
  • the heating conductor 3 can be lowered, for example, by means of levers, linkages, by motor, Springs can be carried out by memory metals or bimetals.
  • the Carrying out the distance between the heating conductor 3 and the hotplate body 1 can be carried out manually with a position detector on the control.
  • the heating conductor 3 for the heating is made of an FeCrAl alloy educated.
  • this heating conductor 3 can also consist of thick-film resistors consist of a screen printing process on the bottom 14 of the hob body are applied and then baked. On the place of the adhesive layers then occurs a glass layer and this is the Heating conductor 3 laid in thick film technology. To protect the heating conductor 3 against corrosion it is also covered with a layer of glass on the outside.
  • the heating conductor structures can be applied by screen printing.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Surface Heating Bodies (AREA)
  • Resistance Heating (AREA)
  • Cookers (AREA)
EP98104448A 1997-03-20 1998-03-12 Plaque de cuisson électrique Withdrawn EP0866641A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1997111541 DE19711541A1 (de) 1997-03-20 1997-03-20 Elektrokochplatte
DE19711541 1997-03-20

Publications (2)

Publication Number Publication Date
EP0866641A2 true EP0866641A2 (fr) 1998-09-23
EP0866641A3 EP0866641A3 (fr) 1998-10-21

Family

ID=7823957

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98104448A Withdrawn EP0866641A3 (fr) 1997-03-20 1998-03-12 Plaque de cuisson électrique

Country Status (2)

Country Link
EP (1) EP0866641A3 (fr)
DE (1) DE19711541A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000065876A1 (fr) * 1999-04-21 2000-11-02 Aktiebolaget Electrolux Dispositif chauffant a film mince muni d'une couche barriere
EP1306621A1 (fr) * 2001-10-29 2003-05-02 Nutri Pack Belgique S.A. Elément chauffant plan pour appareil de remise en température d'aliments
EP1475998A1 (fr) * 2003-05-03 2004-11-10 Ceramaspeed Limited Ensemble chauffant électrique
EP3411629A4 (fr) * 2016-02-01 2019-04-17 Evo, Inc. Système de cuisson ayant de multiples éléments chauffants

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU5408599A (en) * 1998-09-03 2000-03-27 Aktiebolaget Electrolux An insulated thin film heater
DE10018415C1 (de) 2000-04-03 2001-09-27 Schott Glas Verbindung einer Anschlussstelle mit einer elektrischen Leiterbahn einer Platte
GB2362515B (en) * 2000-04-13 2003-09-24 Zeiss Stiftung Connection of a junction to an electrical conductor track on a plate
DE10225337A1 (de) * 2002-06-06 2003-12-24 Schott Glas Kochsystem mit direkt geheizter Glaskeramikplatte
DE10250317B4 (de) 2002-10-29 2004-10-28 Schott Glas Glas- oder Glaskeramikplatte mit einer elektrischen Heizeinheit
DE10356211A1 (de) * 2003-12-02 2005-06-30 Schott Ag Heizvorrichtung, insbesondere keramisches Kochfeld, und Verfahren zur Herstellung eines solchen
DE102018209197A1 (de) * 2018-06-08 2019-12-12 Arpa Sasu Induktionskochfeld und Verfahren zur Montage eines Induktionskochfelds
DE102019214367B4 (de) * 2019-09-20 2021-06-10 E.G.O. Elektro-Gerätebau GmbH Kochfeld und Verfahren zum Betrieb eines Kochfelds

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2202760A1 (de) * 1972-01-21 1973-08-02 Siemens Elektrogeraete Gmbh Herdmulde
US3848111A (en) * 1973-09-24 1974-11-12 Corning Glass Works Electrical heating unit
US4114009A (en) * 1976-02-03 1978-09-12 Matsushita Electric Industrial Co., Ltd. Switching and heat control mechanism for induction heating cooking apparatus having a plurality of work coils
DE3723345A1 (de) * 1987-07-15 1989-01-26 Ego Elektro Blanc & Fischer Elektrische heizvorrichtung fuer eine heizplatte
EP0481162A2 (fr) * 1990-10-15 1992-04-22 Lancet S.A. Appareil de cuisson domestique
JPH0737681A (ja) * 1993-07-20 1995-02-07 Hitachi Home Tec Ltd 平面発熱体
DE29702813U1 (de) * 1997-01-10 1997-05-22 E.G.O. Elektro-Gerätebau Gmbh, 75038 Oberderdingen Kontaktwärmeübertragendes Kochsystem mit einer Elektro-Kochplatte

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3086101A (en) * 1956-05-17 1963-04-16 Philco Corp Heaters
DE2207343B1 (de) * 1972-02-17 1973-08-09 Siemens-Electrogeräte GmbH, 1000 Berlin u. 8000 München Elektrische heizplatte
DE3610513A1 (de) * 1986-03-27 1987-10-01 Claus Radebold Elektrische kochplatte mit schnellstzuregulierender waermeabgabe
DE3810586A1 (de) * 1988-03-29 1989-10-12 Ego Elektro Blanc & Fischer Beheizung fuer elektrische kochgeraete
GB9211331D0 (en) * 1992-05-28 1992-07-15 Chinacraft Ltd Hot plate for food

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2202760A1 (de) * 1972-01-21 1973-08-02 Siemens Elektrogeraete Gmbh Herdmulde
US3848111A (en) * 1973-09-24 1974-11-12 Corning Glass Works Electrical heating unit
US4114009A (en) * 1976-02-03 1978-09-12 Matsushita Electric Industrial Co., Ltd. Switching and heat control mechanism for induction heating cooking apparatus having a plurality of work coils
DE3723345A1 (de) * 1987-07-15 1989-01-26 Ego Elektro Blanc & Fischer Elektrische heizvorrichtung fuer eine heizplatte
EP0481162A2 (fr) * 1990-10-15 1992-04-22 Lancet S.A. Appareil de cuisson domestique
JPH0737681A (ja) * 1993-07-20 1995-02-07 Hitachi Home Tec Ltd 平面発熱体
DE29702813U1 (de) * 1997-01-10 1997-05-22 E.G.O. Elektro-Gerätebau Gmbh, 75038 Oberderdingen Kontaktwärmeübertragendes Kochsystem mit einer Elektro-Kochplatte

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 095, no. 005, 30. Juni 1995 & JP 07 037681 A (HITACHI HOME TEC LTD), 7. Februar 1995 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000065876A1 (fr) * 1999-04-21 2000-11-02 Aktiebolaget Electrolux Dispositif chauffant a film mince muni d'une couche barriere
EP1306621A1 (fr) * 2001-10-29 2003-05-02 Nutri Pack Belgique S.A. Elément chauffant plan pour appareil de remise en température d'aliments
EP1475998A1 (fr) * 2003-05-03 2004-11-10 Ceramaspeed Limited Ensemble chauffant électrique
US7057139B2 (en) 2003-05-03 2006-06-06 Ceramaspeed Limited Electric heating assembly
EP3411629A4 (fr) * 2016-02-01 2019-04-17 Evo, Inc. Système de cuisson ayant de multiples éléments chauffants
US11589422B2 (en) 2016-02-01 2023-02-21 Evo America, Llc Cooking system with multiple heating elements

Also Published As

Publication number Publication date
EP0866641A3 (fr) 1998-10-21
DE19711541A1 (de) 1998-09-24

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