EP0069298A1 - Cooking plate - Google Patents

Cooking plate Download PDF

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Publication number
EP0069298A1
EP0069298A1 EP82105607A EP82105607A EP0069298A1 EP 0069298 A1 EP0069298 A1 EP 0069298A1 EP 82105607 A EP82105607 A EP 82105607A EP 82105607 A EP82105607 A EP 82105607A EP 0069298 A1 EP0069298 A1 EP 0069298A1
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EP
European Patent Office
Prior art keywords
hotplate
cooking plate
plate according
resistance layer
layer
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.)
Granted
Application number
EP82105607A
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German (de)
French (fr)
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EP0069298B1 (en
Inventor
Robert Kicherer
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EGO Elektro Geratebau GmbH
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EGO Elektro Gerate Blanc und Fischer GmbH
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Priority to AT82105607T priority Critical patent/ATE21755T1/en
Publication of EP0069298A1 publication Critical patent/EP0069298A1/en
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    • 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
    • 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

Definitions

  • the invention relates to a hotplate with a flat hotplate body which has an essentially flat upper and lower side in the heated area, an electric heating applied to the underside of the hotplate body, and optionally a base plate and / or an upper case edge.
  • the invention has for its object to provide a hotplate of the type mentioned, which is particularly simple in construction and just as easy to manufacture, which has the lowest possible heat capacity, and guarantees a very short heating time with relatively low electrical connection values.
  • the invention proposes that, in the case of a hotplate of the type mentioned at the outset, the hotplate body is formed from a flat substrate made of highly heat-conducting, electrically insulating material, on the underside of which a layer of resistance material is applied.
  • the hotplate body advantageously consists of ceramic, for example of magnesium oxide, aluminum oxide or another suitable technical ceramic, such as KER 520. It is also advantageous to use baked reaction-bonded or hot-pressed silicon nitride. This material has a low coefficient of expansion with good thermal conductivity and exceptional thermal shock resistance. Due to the high to sufficient mechanical strength, their high insulation values and good thermal conductivity at the same time, it is possible to make the hotplate body thin, so that the hotplate constructed in this way has a practically vanishingly small heat has capacity. Therefore, a parboil can take place very quickly without consuming too much electrical power.
  • the resistance layer is preferably evaporated in vacuo. However, it is particularly favorable if it is printed using the screen printing method.
  • the resistance consists of a so-called cermet layer, in which platinum, rhodium or another suitable metal in oxide form is mixed in powder form in a glass frit.
  • one or more temperature-dependent substances with a negative (NTC) or positive (PTC) resistance coefficient can be applied in the same screen printing process.
  • the resistance value of the layer is matched by reducing the cross section. This can be done in particular with the aid of a laser.
  • the ceramic substrate is advantageously colored. This makes it possible to give the hotplate an attractive appearance.
  • the resistance layer is divided into individual areas that are isolated or isolatable from one another. This makes it possible to use both individual areas of the hotplate surface and combinations to be heated separately from areas.
  • the innermost region can have a circular shape, while a plurality of circular ring regions can be connected, which thus enable the diameter of the hotplate in operation to be increased.
  • the resistance layer has areas of different electrical surface stress.
  • the heat given off by the individual areas can be adapted to the requirements of cooking. For example, it is possible to heat the outside area of a round cooking surface more strongly, which is particularly advantageous if commercially available cooking pots are used, which generally only rest on the outside of the outer ring of the cooking plate.
  • the areas are ring-shaped or circular.
  • the invention proposes that thermal insulation is arranged below the resistance layer, i.e. between the resistance layer and any floor panel that may be present.
  • the electrical connection lines are advantageously brazed onto the resistance layer or an additional silver plating. This is a particularly cheap, space-saving and inexpensive type of fastening, since no additional terminals are required at this point.
  • Silvering can also be produced in the manufacturing process of the resistance layer. It is also possible as Contacting a silver-palladium layer, also by screen printing, onto which, for example, a metal bracket made of nickel sheet is then soldered. Electrical assembly by conventional resistance welding can then be carried out at this angle. It is also possible to evaporate a nickel layer as a contact in a vacuum, onto which a metal angle is then welded, for example in a laser process.
  • strain relief of these connections is advantageously taken up by the downward leg of the rim.
  • the invention further proposes that the downward leg of the rim be provided with at least two bolts which are used to attach the hotplate in the dish with the aid of the attachment plate or of the bottom plate are provided.
  • the attachment of the substrate to the rim of the overflow can also be carried out extremely easily, since according to the invention the heated plate is preferably glued tightly with a ceramic adhesive into the rim of the overflow. It is particularly advantageous when the coefficient of expansion of the upper edge of the case is equal to that of the heated plate.
  • the areas of the resistance layer have the shape of circular or circular ring sectors.
  • a circular shape as it would have a normal hotplate, can be formed by eight circular sectors of equal size, one connecting line being connected in the middle of the circle and the other on the circumference of the circle.
  • the regions of the resistance layer are formed in the form of circular or circular ring sectors, they alternately have incisions on both sides. These incisions reduce the cross-section in the surface direction, the regions of the resistance layer thus formed taking the form of a meander. It is preferably provided that two sectors are symmetrical to each other with respect to their dividing line.
  • a hotplate with its upper rim 12 is inserted into an opening in a hob 11.
  • This overflow edge has a circumferential, approximately horizontal section 13, the outer edge of which is bent downwards.
  • a sealing ring 15 is inserted between section 13 and section 14 of the hob 11.
  • the overhang edge 12 has a shoulder 16 which is intended to receive the hotplate body 17.
  • the overhang edge 12 On its side of the shoulder 16 facing the center point, the overhang edge 12 has a circumferential flat-cylindrical leg 18, to which three screw bolts 19 are fastened, distributed over the circumference. Only one of these three bolts can be seen in FIG. 1.
  • a base plate 20 is arranged below the hotplate and has a number of openings corresponding to the number of screw bolts 19 through which the screw bolt 19 extends.
  • a nut 21 and a washer 22 are screwed onto the screw bolt 19, with this screw connection pressing the base plate with its peripheral edge 23 against the underside of the hob 11. In this way, the overhang edge 12 and the base plate 20 are attached to the hob 11.
  • the bottom plate 20 has on its top, i.e. on its side facing the hotplate, a relatively thick layer 26 of insulating material, which has a circumferential annular groove 29 for receiving the leg 18 of the rim 12.
  • a resistance layer 27 is applied to the underside of the hotplate body 17, for example printed on with the aid of a screen printing process.
  • This resistance layer 27 is applied directly to the hotplate body 17, since it consists of electrically insulating material.
  • a thin protective layer 28 is applied to the underside of the resistance layer 27, which protects the resistance layer 27 from mechanical damage.
  • Fig. 3 shows the view of the hotplate body 17 in Fig. 1 from below.
  • the upper rim 12 is not shown.
  • the resistance layer 27 consists of a total of eight circular ring sectors 30. Each of these sectors 30 extends over an angle of approximately 45 °. If one looks at the two upper sectors in FIG. 3, it can clearly be seen that they are constructed symmetrically to the dividing line 31. Incisions 32, 33 and 34 are made in each sector, each extending along a concentric circular arc and giving each sector 30 a meandering appearance.
  • a star-like silvering 35 with four beams is applied, the four beams 36 each engaging in a joint between two sectors 30.
  • This silvering 35 connects the one wire, which is not shown for the sake of simplicity, while the second wire engages the four silvering 37 from the outside, which are also arranged in joints between two sectors.
  • the specific surface loading of the sectors 30 decreases from the outside inwards.

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  • 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)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Baking, Grill, Roasting (AREA)
  • Surface Heating Bodies (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Cookers (AREA)
  • Electric Stoves And Ranges (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Vending Machines For Individual Products (AREA)

Abstract

An electric hotplate has a hotplate body in the form of a thin ceramic substrate, to whose bottom surface is applied, e.g. by printing, a thin resistive material film. This resistive material film is covered by a protective coating, which prevents damage. Between the protective coating and the bottom tray of the hotplate is provided a thermal insulating layer. The hotplate has an extremely low thermal capacity, so that rapid preliminary cooking or boiling is possible with low power consumption.

Description

Die Erfindung betrifft eine Kochplatte mit einem im beheizten Bereich eine im wesentlichen ebene Ober- und Unterseite aufweisenden flachen Kochplattenkörper, einer an der Unterseite des Kochplattenkörpers anliegenden elektrischen Beheizung, sowie ggf. einem Bodenblech und/oder einem Oberfallrand.The invention relates to a hotplate with a flat hotplate body which has an essentially flat upper and lower side in the heated area, an electric heating applied to the underside of the hotplate body, and optionally a base plate and / or an upper case edge.

Es ist bereits bekannt, an der Unterseite einer Glaskeramik-Kochfläche eine dünne Schicht aus elektrischem Material anzuordnen, mit deren Unterseite ein Widerstands-Folienheizelement verklebt ist. Dabei wird die Heizfolie und die die elektrische Schicht mit Hilfe einer Federeinrichtung gegen die Unterseite der Glaskeramik-Kochplatte angedrückt. (DE-OS 27 12 881). Diese Lösung hat aber den Nachteil, daß nur sehr niedere Gebrauchstemperaturen möglich sind, da die bekannten Glaskeramiken ab 300 °C elektrisch leitend werden.It is already known to arrange a thin layer of electrical material on the underside of a glass ceramic cooktop, to the underside of which a resistance foil heating element is glued. The heating foil and the electrical layer are pressed against the underside of the glass ceramic hotplate with the aid of a spring device. (DE-OS 27 12 881). However, this solution has the disadvantage that only very low operating temperatures are possible, since the known glass ceramics become electrically conductive from 300 ° C.

Weiterhin ist es bekannt (DE-OS 28 14 085), ein derartiges Folienheizelement mit Abstand unterhalb der Kochplatte anzuordnen.Furthermore, it is known (DE-OS 28 14 085) to arrange such a film heating element at a distance below the hotplate.

Es ist schon vorgeschlagen worden (P 30 33 828), an der Unterseite eines flachen, aus Metall bestehenden Kochplattenkörpers einen dünnen und flexiblen Rohrheizkörper anzuordnen, der von einem Federelement gegen die Unterseite des Kochplattenkörpers angedrückt wird.It has already been proposed (P 30 33 828) to arrange a thin and flexible tubular heating element on the underside of a flat, hotplate body made of metal, which is pressed against the underside of the hotplate body by a spring element.

Diese Elektrokochplatte hat sich bewährt. Der Erfindung liegt die Aufgabe zugrunde, eine Kochplatte der eingangs genannten Art zu schaffen, die besonders einfach im Aufbau und ebenso einfach herzustellen ist, die eine möglichst geringe Wärmekapazität aufweist, und bei relativ geringen elektrischen Anschlußwerten eine sehr kurze Ankochzeit garantiert.This electric hotplate has proven itself. The invention has for its object to provide a hotplate of the type mentioned, which is particularly simple in construction and just as easy to manufacture, which has the lowest possible heat capacity, and guarantees a very short heating time with relatively low electrical connection values.

Zur Lösung dieser Aufgabe schlägt die Erfindung vor, daß bei einer Kochplatte der eingangs genannten Art der, Kochplattenkörper von einem flachen Substrat aus gut wärmeleitendem, elektrisch isolierendem Material gebildet ist, auf dessen Unterseite eine Schicht aus Widerstandsmaterial aufgebracht ist.To achieve this object, the invention proposes that, in the case of a hotplate of the type mentioned at the outset, the hotplate body is formed from a flat substrate made of highly heat-conducting, electrically insulating material, on the underside of which a layer of resistance material is applied.

Dabei besteht mit Vorteil der Kochplattenkörper aus Keramik, beispielsweise aus Magnesiumoxid, Aluminiumoxid oder einer anderen geeigneten technischen Keramik, wie z.B. KER 520. Vorteilhaft kann auch eingebranntes reaktionsgebundenes oder warmgepreßtes Siliziumnitrid eingesetzt werden. Dieses Material hat einen niederen Ausdehnungskoeffizienten bei guter Wärmeleitfähigkeit und außergewöhnlicher Temperatur-Wechselbeständigkeit. Aufgrund-der hohen bis ausreichenden mechanischen Festigkeit, ihrer, hohen Isolationswerte bei gleichzeitig guter Wärmeleitfähigkeit wird es dadurch möglich, den Kochplattenkörper dünn auszugestalten, so daß die derart aufgebaute Kochplatte eine praktisch verschwindend kleine Wärmekapazität besitzt. Daher kann ein Ankochen sehr schnell erfolgen, ohne daß eine zu hohe elektrische Leistung verbraucht wird.The hotplate body advantageously consists of ceramic, for example of magnesium oxide, aluminum oxide or another suitable technical ceramic, such as KER 520. It is also advantageous to use baked reaction-bonded or hot-pressed silicon nitride. This material has a low coefficient of expansion with good thermal conductivity and exceptional thermal shock resistance. Due to the high to sufficient mechanical strength, their high insulation values and good thermal conductivity at the same time, it is possible to make the hotplate body thin, so that the hotplate constructed in this way has a practically vanishingly small heat has capacity. Therefore, a parboil can take place very quickly without consuming too much electrical power.

Die Widerstandsschicht ist vorzugsweise im Vakuum aufgedampft. Besonders günstig jedoch ist es, wenn sie im Siebdruckverfahren aufgedruckt ist. Dabei besteht der Widerstand aus einer sogenannten Cermet-Schicht, bei der in einer Glasfritte Platin, Rhodium oder ein anderes geeignetes Metall in Oxidform pulverförmig beigemischt ist.The resistance layer is preferably evaporated in vacuo. However, it is particularly favorable if it is printed using the screen printing method. The resistance consists of a so-called cermet layer, in which platinum, rhodium or another suitable metal in oxide form is mixed in powder form in a glass frit.

Zur Temperatur-Abfühlung können im gleichen Siebdruckverfahren noch eine oder mehrere temperaturabhängige Substanzen mit einem negativen (NTC), oder positiven (PTC) Widerstandskoeffizienten aufgebracht werden.For temperature sensing, one or more temperature-dependent substances with a negative (NTC) or positive (PTC) resistance coefficient can be applied in the same screen printing process.

In beiden Fällen wird eine einfache Aufbringung mit gleichzeitig guter Haftung der Widerstandsschicht an dem Kochplattenkörper erreicht.In both cases, simple application with good adhesion of the resistance layer to the hotplate body is achieved.

In Weiterbildung der Erfindung ist vorgesehen, daß der Widerstandswert der Schicht durch Querschnittsverminderung abgestimmt ist. Dies kann insbesondere mit Hilfe eines Lasers erfolgen.In a further development of the invention it is provided that the resistance value of the layer is matched by reducing the cross section. This can be done in particular with the aid of a laser.

Mit Vorteil ist das aus Keramik bestehende Substrat eingefärbt. Damit ist es möglich, der Kochplatte auch ein optisch ansprechendes Aussehen zu verleihen.The ceramic substrate is advantageously colored. This makes it possible to give the hotplate an attractive appearance.

In Weiterbildung ist vorgesehen, daß die Widerstandsschicht in einzelne, gegeneinander isolierte bzw. isolierbare Bereiche aufgeteilt ist. Damit wird es möglich, sowohl einzelne Bereiche der Kochplattenfläche als auch Kombinationen von Bereichen getrennt zu beheizen. Beispielsweise kann der innerste Bereich eine Kreisform aufweisen, während mehrere Kreisringbereiche hinzuschaltbar sind, die damit ein Vergrößern des Durchmessers der in Betrieb befindlichen Kochplatte ermöglichen.In a further development it is provided that the resistance layer is divided into individual areas that are isolated or isolatable from one another. This makes it possible to use both individual areas of the hotplate surface and combinations to be heated separately from areas. For example, the innermost region can have a circular shape, while a plurality of circular ring regions can be connected, which thus enable the diameter of the hotplate in operation to be increased.

Nach einem anderen Merkmal der Erfindung weist die Widerstandsschicht Bereiche unterschiedlicher elektrischer'Oberflächenbelastung auf. Mit dieser von der Erfindung vorgeschlagenen Maßnahme kann die von den einzelnen Bereichen abgegebene Wärme an die Erfordernisse des Kochens angepaßt werden. Beispielsweise ist es möglich, den Außenbereich einer runden Kochfläche stärker zu heizen, was insbesondere dann von Vorteil ist, wenn handelsübliche Kochtöpfe verwendet werden, die in der Regel nur außen am äußeren Ring der Kochplatte aufliegen.According to another feature of the invention, the resistance layer has areas of different electrical surface stress. With this measure proposed by the invention, the heat given off by the individual areas can be adapted to the requirements of cooking. For example, it is possible to heat the outside area of a round cooking surface more strongly, which is particularly advantageous if commercially available cooking pots are used, which generally only rest on the outside of the outer ring of the cooking plate.

Nach einem weiteren Merkmal der Erfindung ist vorgesehen, daß die Bereiche ringförmig oder kreisförmig ausgebildet sind.According to a further feature of the invention it is provided that the areas are ring-shaped or circular.

Um eine gute thermische Abschirmung der Kochplatte nach unten zu erreichen, schlägt die Erfindung vor, daß unterhalb der Widerstandsschicht, d.h.-zwischen der Widerstandsschicht und einem ggf. vorhandenen Bodenblech, eine thermische Isolierung angeordnet ist.In order to achieve good thermal shielding of the hotplate from below, the invention proposes that thermal insulation is arranged below the resistance layer, i.e. between the resistance layer and any floor panel that may be present.

Die elektrischen Anschlußleitungen sind mit Vorteil auf die Widerstandsschicht oder eine zusätzliche Versilberung hartgelötet. Dies ist eine besonders günstige, platzsparende und billige Befestigungsart, da keine zusätzlichen Anschlußklemmen an dieser Stelle benötigt werden. Die Versilberung läßt sich bei dem Herstellungsverfahren der Widerstandsschicht ebenfalls mit herstellen. Es ist auch möglich, als Kontaktierung eine Silber-Palladium-Schicht, ebenfalls im Siebdruckverfahren aufzubringen, auf die dann z.B. ein Metallwinkel aus Nickelblech hart aufgelötet wird. An diesem Winkel kann dann eine elektrische Konfektionierung durch herkömmliches Widerstandsschweißen vorgenommen werden. Auch ist es möglich, als Kontaktierung eine Nickelschicht im Vacuum aufzudampfen, auf die dann ein Metallwinkel, z.B. im Laserverfahren aufgeschweißt wird.The electrical connection lines are advantageously brazed onto the resistance layer or an additional silver plating. This is a particularly cheap, space-saving and inexpensive type of fastening, since no additional terminals are required at this point. Silvering can also be produced in the manufacturing process of the resistance layer. It is also possible as Contacting a silver-palladium layer, also by screen printing, onto which, for example, a metal bracket made of nickel sheet is then soldered. Electrical assembly by conventional resistance welding can then be carried out at this angle. It is also possible to evaporate a nickel layer as a contact in a vacuum, onto which a metal angle is then welded, for example in a laser process.

Die Zugentlastung dieser Anschlüsse wird dabei mit Vorteil von dem nach unten gehenden Schenkel des überfallrandes aufgenommen.The strain relief of these connections is advantageously taken up by the downward leg of the rim.

Um eine gute und sichere Befestigung der Kochplatte in einer Herdmulde zu ermöglichen, wird von der Erfindung weiterhin vorgeschlagen, daß der nach unten gehende Schenkel des überfallrandes mit mindestens zwei Bolzen versehen ist, die zur Befestigung der Kochplatte in der Mulde mit Hilfe des Befestigungstellers bzw. des Bodenbleches vorgesehen sind.In order to enable a good and secure attachment of the hotplate in a hob, the invention further proposes that the downward leg of the rim be provided with at least two bolts which are used to attach the hotplate in the dish with the aid of the attachment plate or of the bottom plate are provided.

Auch die Befestigung des Substrates an dem überfallrand läßt sich außerordentlich einfach durchführen, da erfindungsgemäß die beheizte Platte vorzugsweise mit einem Keramikkleber in den Oberfallrand dicht eingeklebt ist. Dabei gestaltet sie sich insbesondere dann außerordentlich günstig, wenn der Ausdehnungskoeffizient des Oberfallrandes dem der beheizten Platte angeglichen ist.The attachment of the substrate to the rim of the overflow can also be carried out extremely easily, since according to the invention the heated plate is preferably glued tightly with a ceramic adhesive into the rim of the overflow. It is particularly advantageous when the coefficient of expansion of the upper edge of the case is equal to that of the heated plate.

In Weiterbildung ist vorgesehen, daß die Bereiche der Widerstandsschicht die Form von Kreis- bzw. Kreisringsektoren aufweisen. Beispielsweise läßt sich eine Kreisform, wie sie eine normale Kochplatte aufweisen würde, durch acht gleich große Kreissektoren bilden, wobei die eine Anschlußleitung in der Mitte des Kreises und die andere am Umfang des Kreises angeschlossen wird. Bei der Ausbildung der Bereiche der Widerstandsschicht in Form von Kreis- bzw. Kreisringsektoren weisen diese abwechselnd auf beiden Seiten Einschnitte auf. Diese Einschnitte verringern den Querschnitt in Flächenrichtung, wobei die so gebildeten Bereiche der Widerstandsschicht die Form eines Mäanders erhalten. Dabei ist vorzugsweise vorgesehen, daß je zwei Sektoren bzgl. ihrer Trennungslinie zueinander symmetrisch ausgebildet sind. Dies hat den besonderen Vorteil, daß beidseits einer Trennungslinie-keine Windungsspannungen vorhanden sind, so daß die Potentiale auf beiden Seiten der Trennschicht gleich groß sind. Dies bedeutet aber, daß die isolierenden Trennungslinien zwischen je zwei Bereichen so dünn gemacht werden können, wie es das zum Aufbringen der Widerstandsschicht benutzte Verfahren zuläßt. Dies führt natürlich wieder dazu, daß die Kochfläche überall gleich warm bzw. heiß ist.In a further development it is provided that the areas of the resistance layer have the shape of circular or circular ring sectors. For example, a circular shape, as it would have a normal hotplate, can be formed by eight circular sectors of equal size, one connecting line being connected in the middle of the circle and the other on the circumference of the circle. When the regions of the resistance layer are formed in the form of circular or circular ring sectors, they alternately have incisions on both sides. These incisions reduce the cross-section in the surface direction, the regions of the resistance layer thus formed taking the form of a meander. It is preferably provided that two sectors are symmetrical to each other with respect to their dividing line. This has the particular advantage that there are no winding voltages on both sides of a separation line, so that the potentials on both sides of the separation layer are the same. However, this means that the isolating dividing lines between two areas can be made as thin as the method used to apply the resistance layer allows. Of course, this means that the cooking surface is equally warm or hot everywhere.

Weitere Merkmale, Einzelheiten und Vorzüge der Erfindung ergeben sich aus den Ansprüchen, der folgenden Beschreibung einer bevorzugten Ausführungsform sowie anhand der Zeichnung. Hierbei zeigen:

  • Fig. 1 einen Längsschnitt durch eine erfindungsgemäß ausgestaltete Kochplatte;
  • Fig. 2 eine vergrößerte Einzelheit der Anordnung nach Fig. 1;
  • Fig. 3 eine Untenansicht der Widerstandsschicht der Kochplatte nach Fig. 1.
Further features, details and advantages of the invention result from the claims, the following description of a preferred embodiment and from the drawing. Here show:
  • 1 shows a longitudinal section through a hotplate designed according to the invention;
  • FIG. 2 shows an enlarged detail of the arrangement according to FIG. 1;
  • 3 shows a bottom view of the resistance layer of the hotplate according to FIG. 1.

In eine öffnung einer Herdmulde 11 ist eine Kochplatte mit ihrem Oberfallrand 12 eingesetzt. Dieser Überfallrand besitzt einen umlaufenden, etwa horizontal verlaufenden Abschnitt 13, dessen Außenrand nach unten abgebogen ist. Zwischen den Abschnitt 13 und einen Abschnitt 14 der Herdmulde 11 ist ein Dichtring 15 eingelegt. Der Überfallrand 12 besitzt neben dem etwa horizontal verlaufenden Abschnitt 13 eine Schulter 16, die zur Aufnahme des Kochplattenkörpers 17 bestimmt ist. Auf seiner dem Mittelpunkt zugewandten Seite der Schulter 16 besitzt der Überfallrand 12 einen umlaufenden flachzylindrigen Schenkel 18, an dem, über den Umfang verteilt, drei Schraubbolzen 19 befestigt sind. Von diesen drei Schraubbolzen ist in Fig. 1 nur ein einziger zu sehen.A hotplate with its upper rim 12 is inserted into an opening in a hob 11. This overflow edge has a circumferential, approximately horizontal section 13, the outer edge of which is bent downwards. A sealing ring 15 is inserted between section 13 and section 14 of the hob 11. In addition to the approximately horizontal section 13, the overhang edge 12 has a shoulder 16 which is intended to receive the hotplate body 17. On its side of the shoulder 16 facing the center point, the overhang edge 12 has a circumferential flat-cylindrical leg 18, to which three screw bolts 19 are fastened, distributed over the circumference. Only one of these three bolts can be seen in FIG. 1.

Unterhalb der Kochplatte ist ein Bodenblech 20 angeordnet, das eine der Anzahl der Schraubbolzen 19 entsprechende Anzahl von öffnungen aufweist, durch die der Schraubbolzen 19 hindurchgreift. Auf den Schraubbolzen 19 ist eine Mutter 21 und eine Unterlegscheibe 22 aufgeschraubt, wobei durch diese Verschraubung das Bodenblech mit seinem umlaufenden Rand 23 gegen die Unterseite der Herdmulde 11 angedrückt wird. Auf diese Weise erfolgt eine Befestigung des Überfallrandes 12 und des Bodenbleches 20 mit der Herdmulde 11.A base plate 20 is arranged below the hotplate and has a number of openings corresponding to the number of screw bolts 19 through which the screw bolt 19 extends. A nut 21 and a washer 22 are screwed onto the screw bolt 19, with this screw connection pressing the base plate with its peripheral edge 23 against the underside of the hob 11. In this way, the overhang edge 12 and the base plate 20 are attached to the hob 11.

Auf die Schulter 16 und den anschließenden vertikal verlaufenden Absatz 24 des Überfallrandes 12 ist der Kochplattenkörper 17, der bei dem bevorzugten Ausführungsbeispiel aus Keramik besteht, mit einem eine dünne Schicht 25 bildenden Keramikkleber eingeklebt, siehe insbesondere Fig. 2.The hotplate body 17, which in the preferred embodiment consists of ceramic, is glued onto the shoulder 16 and the subsequent vertically extending shoulder 24 of the overhang edge 12 with a ceramic adhesive forming a thin layer 25, see in particular FIG. 2.

Das Bodenblech 20 besitzt auf seiner Oberseite, d.h. auf seiner der Kochplatte zugewandten Seite, eine relativ dicke Schicht 26 aus Isoliermaterial, das eine umlaufende Ringnut 29 zur Aufnahme des Schenkels 18 des Überfallrandes 12 aufweist.The bottom plate 20 has on its top, i.e. on its side facing the hotplate, a relatively thick layer 26 of insulating material, which has a circumferential annular groove 29 for receiving the leg 18 of the rim 12.

Wie aus der Fig. 2 hervorgeht, ist auf der Unterseite des Kochplattenkörpers 17 eine Widerstandsschicht 27 aufgebracht, beispielsweise mit Hilfe eines Siebdruckverfahrens aufgedruckt. Diese Widerstandsschicht 27 ist direkt auf den Kochplattenkörper 17 aufgebracht, da dieser aus elektrisch isolierendem Material besteht. Auf der Unterseite der Widerstandsschicht 27 ist eine dünne Schutzschicht 28 aufgebracht, die die Widerstandsschicht 27 vor mechanischen Beschädigungen schützt.As can be seen from FIG. 2, a resistance layer 27 is applied to the underside of the hotplate body 17, for example printed on with the aid of a screen printing process. This resistance layer 27 is applied directly to the hotplate body 17, since it consists of electrically insulating material. A thin protective layer 28 is applied to the underside of the resistance layer 27, which protects the resistance layer 27 from mechanical damage.

Fig. 3 zeigt die Ansicht des Kochplattenkörpers 17 in Fig. 1 von unten. Dabei ist aus Vereinfachungsgründen der Oberfallrand 12 nicht eingezeichnet. Wie sich aus Fig. 3 ergibt, besteht die Widerstandsschicht 27 aus insgesamt acht Kreisringsektoren 30. Jeder dieser Sektoren 30 erstreckt sich über einen Winkel von etwa 45°. Betrachtet man die beiden oberen Sektoren in der Fig. 3, so ist deutlich zu sehen, daß sie symmetrisch zu der Trennungslinie 31 aufgebaut sind. In jedem Sektor sind Einschnitte 32, 33 und 34 eingebracht, die sich jeweils längs eines konzentrischen Kreisbogens erstrecken und jedem Sektor 30 ein mäanderförmiges Aussehen geben.Fig. 3 shows the view of the hotplate body 17 in Fig. 1 from below. For reasons of simplification, the upper rim 12 is not shown. 3, the resistance layer 27 consists of a total of eight circular ring sectors 30. Each of these sectors 30 extends over an angle of approximately 45 °. If one looks at the two upper sectors in FIG. 3, it can clearly be seen that they are constructed symmetrically to the dividing line 31. Incisions 32, 33 and 34 are made in each sector, each extending along a concentric circular arc and giving each sector 30 a meandering appearance.

Im Mittelpunkt des Kochplattenkörpers 17 ist eine sternartige Versilberung 35 mit vier Strahlen aufgebracht, wobei die vier Strahlen 36 jeweils in eine Trennfuge zwischen zwei Sektoren 30 eingreifen. Mit dieser Versilberung 35 wird der aus Gründen der Vereinfachung nicht dargestellte eine Leitungsdraht verbunden, während der zweite Leitungsdraht von außen an den vier Versilberungen 37 angreift, die ebenfalls in Trennfugen zwischen zwei Sektoren angeordnet sind.In the center of the hotplate body 17, a star-like silvering 35 with four beams is applied, the four beams 36 each engaging in a joint between two sectors 30. This silvering 35 connects the one wire, which is not shown for the sake of simplicity, while the second wire engages the four silvering 37 from the outside, which are also arranged in joints between two sectors.

Um eine besonders gute Anpassung der Wärmecharakteristik der erfindungsgemäßen Kochplatte zu ermöglichen, kann vorgesehen sein, daß die spezifische Oberflächenbelastung der Sektoren 30 von außen nach innen abnimmt. So kann beispielsweise der äußere Teil jedes Sektors 30, d.h. der Bereich zwischen dem Außenrand 38 des Sektors und dem ersten Einschnitt 32, eine Oberflächenbelastung von etwa 11,5 W/cm besitzen, während der Bereich zwischen dem Innenrand 39 des Sektors 30 und dem benachbarten Einschnitt 34 eine Belastung von etwa 8 W/cm2 besitzt.In order to enable a particularly good adaptation of the thermal characteristics of the hotplate according to the invention, it can be provided that the specific surface loading of the sectors 30 decreases from the outside inwards. For example, the The outer part of each sector 30, ie the area between the outer edge 38 of the sector and the first notch 32, has a surface load of approximately 11.5 W / cm, while the area between the inner edge 39 of the sector 30 and the adjacent notch 34 has a load of about 8 W / cm 2 .

Claims (21)

1. Kochplatte mit einem im beheizten Bereich eine im wesentlichen ebene Ober- und Unterseite aufweisenden flachen Kochplattenkörper (17), einer an der Unterseite des Kochplattenkörpers (17) anliegenden elektrischen Beheizung, sowie ggf. einem Bodenblech (20) und/oder einem Überfallrand (12), dadurch gekennzeichnet, daß der Kochplattenkörper (17) von einem flachen Substrat aus gut wärmeleitendem, elektrisch isolierendem Material gebildet ist, auf dessen Unterseite eine Schicht (27) aus Widerstandsmaterial aufgebracht ist.1. Hotplate with a flat hotplate body (17) in the heated area which has an essentially flat top and underside, an electric heating applied to the underside of the hotplate body (17), and optionally a base plate (20) and / or a rim ( 12), characterized in that the hotplate body (17) is formed from a flat substrate made of a good heat-conducting, electrically insulating material, on the underside of which a layer (27) of resistance material is applied. 2. Kochplatte nach Anspruch 1, dadurch gekennzeichnet, daß der Kochplattenkörper (17) aus Keramik besteht.2. Hotplate according to claim 1, characterized in that the hotplate body (17) consists of ceramic. 3. Kochplatte nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Widerstandsschicht (27) aufgedruckt ist.3. Cooking plate according to claim 1 or 2, characterized in that the resistance layer (27) is printed. 4. Kochplatte nach Anspruch 1 oder 2, dadurch gekennzeich- . net, daß die Widerstandsschicht (27) aufgedampft ist.4. hotplate according to claim 1 or 2, characterized marked. net that the resistance layer (27) is evaporated. 5. Kochplatte nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Widerstandswert der Schicht (27) durch Querschnittsverminderung abgestimmt ist.5. Cooking plate according to one of the preceding claims, characterized in that the resistance value of the layer (27) is matched by reducing the cross section. 6. Kochplatte nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Widerstandsschicht (27) auf ihrer dem Substrat entgegengesetzten Seite eine mechanische Schutzschicht (28) aufweist.6. Hotplate according to one of the preceding claims, characterized in that the resistance layer (27) has a mechanical protective layer (28) on its side opposite the substrate. 7. Kochplatte nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Keramik-Substrat eingefärbt ist.7. Cooking plate according to one of the preceding claims, characterized in that the ceramic substrate is colored. 8. Kochplatte nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Widerstandsschicht (27) in einzelne, gegeneinander isolierte Bereiche aufgeteilt ist.8. Cooking plate according to one of the preceding claims, characterized in that the resistance layer (27) is divided into individual, mutually insulated areas. 9. Kochplatte nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Widerstandsschicht (27) Bereiche unterschiedlicher elektrischer Oberflächenbelastung aufweist.9. Cooking plate according to one of the preceding claims, characterized in that the resistance layer (27) has areas of different electrical surface stress. 10. Kochplatte nach Anspruch 8 oder 9, dadurch gekennzeichnet, daß die Bereiche ringförmig oder kreisförmig ausgebildet sind.10. Cooking plate according to claim 8 or 9, characterized in that the areas are annular or circular. 11. Kochplatte nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß unterhalb der Widerstandsschicht (27) eine thermische Isolation (26) angeordnet ist.11. Cooking plate according to one of the preceding claims, characterized in that a thermal insulation (26) is arranged below the resistance layer (27). 12. Kochplatte nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die elektrischen Anschlußleitungen auf die Widerstandsschicht (27) oder eine zusätzliche Versilberung (35, 37) bzw. Silber-Palladium-Schicht aufgelötet sind.12. Cooking plate according to one of the preceding claims, characterized in that the electrical connection lines are soldered onto the resistance layer (27) or an additional silvering (35, 37) or silver-palladium layer. 13. Kochplatte nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Zugentlastung der elektrischen Anschlüsse von dem nach unten gehenden Schenkel (18) des Oberfallrandes (12) aufgenommen wird.13. Cooking plate according to one of the preceding claims, characterized in that the strain relief of the electrical connections is received by the downward leg (18) of the upper rim (12). 14. Kochplatte nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der nach unten gehende Schenkel (18) des Oberfallrandes (12) mit mindestens zwei Bolzen (19) versehen ist, die zur Befestigung der Kochplatte in der Mulde (11) mit Hilfe eines thermisch isolierten Befestigungstellers bzw. des Bodenbleches (20) vorgesenen sind.14. Cooking plate according to one of the preceding claims, characterized in that the downward leg (18) of the upper rim (12) is provided with at least two bolts (19) which are used to fasten the cooking plate in the trough (11) with the aid of a thermally insulated mounting plate or the bottom plate (20) are provided. 15. Kochplatte nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Kochplattenkörper (17) vorzugsweise mit einem Keramikkleber (25) in den Oberfallrand (12) dicht eingeklebt ist.15. Hotplate according to one of the preceding claims, characterized in that the hotplate body (17) is preferably glued tightly with a ceramic adhesive (25) in the upper case edge (12). 16. Kochplatte nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Ausdehnungskoeffizient des Oberfallsrandes (12) dem des Kochplattenkörpers (17) angeglichen ist.16. Hotplate according to one of the preceding claims, characterized in that the coefficient of expansion of the upper edge (12) of that of the hotplate body (17) is adjusted. 17. Kochplattenkörper nach einem der Ansprüche 8 bis 16, dadurch gekennzeichnet, daß die Bereiche der Widerstandsschicht (27) die Form von Kreis- bzw. Kreisringsektoren (30) aufweisen.17. Hotplate body according to one of claims 8 to 16, characterized in that the regions of the resistance layer (27) have the shape of circular or circular ring sectors (30). 18. Kochplatte nach Anspruch 17, dadurch gekennzeichnet, daß die Sektoren (30) abwechselnd auf beiden Seiten Einschnitte (32, 33, 34) aufweisen.18. Hotplate according to claim 17, characterized in that the sectors (30) have cuts (32, 33, 34) alternately on both sides. 19. Kochplatte nach Anspruch 17 oder 18, dadurch gekennzeichnet, daß je zwei Sektoren (30) bzgl. ihrer Trennungslinie (31) zueinander symmetrisch ausgebildet sind.19. Cooking plate according to claim 17 or 18, characterized in that two sectors (30) with respect to their dividing line (31) are symmetrical to each other. 20. Kochplatte nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Widerstandsschicht aus einer sogenannten Cermet-Schicht besteht, bei der in einer Glasfritte Platin, Rhodium oder ein anderes geeignetes Metall in Oxidform pulverförmig beigemischt ist.20. Cooking plate according to one of the preceding claims, characterized in that the resistance layer consists of a so-called cermet layer, in which platinum, rhodium or another suitable metal in oxide form is mixed in powder form in a glass frit. 21. Kochplatte nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß zur elektronischen Temperatursteuerung einer oder mehrere Temperatur-Fühler im gleichen Siebdruckverfahren, aus einer temperaturabhängigen Substanz mit negativen (NTC) oder positiven (PTC) Widerstandskoeffizienten aufgebracht sind.21. Cooking plate according to one of the preceding claims, characterized in that for the electronic temperature control one or more temperature sensors are applied in the same screen printing process, from a temperature-dependent substance with negative (NTC) or positive (PTC) resistance coefficients.
EP82105607A 1981-07-08 1982-06-25 Cooking plate Expired EP0069298B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82105607T ATE21755T1 (en) 1981-07-08 1982-06-25 COOKING PLATE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3126989 1981-07-08
DE19813126989 DE3126989A1 (en) 1981-07-08 1981-07-08 COOKING PLATE

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EP0069298A1 true EP0069298A1 (en) 1983-01-12
EP0069298B1 EP0069298B1 (en) 1986-08-27

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US (1) US4527050A (en)
EP (1) EP0069298B1 (en)
JP (1) JPS5819213A (en)
AT (1) ATE21755T1 (en)
AU (1) AU547824B2 (en)
DE (2) DE3126989A1 (en)
ES (1) ES274583Y (en)
FI (1) FI81235C (en)
GR (1) GR76841B (en)
YU (1) YU44352B (en)
ZA (1) ZA824570B (en)

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DE3728466A1 (en) * 1987-08-26 1989-03-09 Ego Elektro Blanc & Fischer COOKER
WO1996009738A1 (en) * 1994-09-20 1996-03-28 Negawatt Gmbh Electric heating element
DE19503723A1 (en) * 1995-02-04 1996-08-08 Ego Elektro Blanc & Fischer Cooking plate with a cast body and process for its manufacture
DE19814949C2 (en) * 1997-05-07 2002-04-18 Aeg Hausgeraete Gmbh Cooking equipment with induction heating and resistance heating
EP0916899A3 (en) * 1997-10-23 1999-07-21 Schott Glas Arrangement of a ceramic heating element as a cooking plate in a recess of a plane surface
EP0916899A2 (en) * 1997-10-23 1999-05-19 Schott Glas Arrangement of a ceramic heating element as a cooking plate in a recess of a plane surface
EP0911586A2 (en) 1997-10-23 1999-04-28 Schott Glas Mounting of a ceramic cooking heater in an opening of a cooking hob
DE10110789C1 (en) * 2001-03-06 2002-07-04 Schott Glas Electrical cooking appliance with non-planar three-dimensional cooking surface of glass or glass ceramic material directly contacted on its outside by resistance heating device
DE10207515B4 (en) * 2002-02-22 2004-12-02 Schott Ag Cooking system with a cooking surface and a holder
DE10344860A1 (en) * 2003-09-26 2005-04-28 Electrolux Home Prod Corp Heating device for a cooking appliance or the like
DE10344860B4 (en) * 2003-09-26 2008-06-26 Electrolux Home Products Corp. N.V. Heating device for a cooking appliance
FR3005388A1 (en) * 2013-05-03 2014-11-07 Topinox Sarl HEATING ELEMENT WITH SECTIONS HAVING DIFFERENT HEATING POWERS, AND COOKING APPARATUS.

Also Published As

Publication number Publication date
US4527050A (en) 1985-07-02
JPH0522353B2 (en) 1993-03-29
JPS5819213A (en) 1983-02-04
EP0069298B1 (en) 1986-08-27
FI81235C (en) 1990-09-10
GR76841B (en) 1984-09-04
FI822371L (en) 1983-01-09
DE3126989A1 (en) 1983-01-27
ES274583U (en) 1984-02-16
ES274583Y (en) 1984-10-01
YU148682A (en) 1984-12-31
AU547824B2 (en) 1985-11-07
AU8535382A (en) 1983-01-13
ATE21755T1 (en) 1986-09-15
FI81235B (en) 1990-05-31
YU44352B (en) 1990-06-30
DE3272881D1 (en) 1986-10-02
FI822371A0 (en) 1982-07-02
ZA824570B (en) 1983-04-27

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