EP0103741A2 - Heating element, especially radiant heating element for the heating of ceramic plates - Google Patents

Heating element, especially radiant heating element for the heating of ceramic plates Download PDF

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Publication number
EP0103741A2
EP0103741A2 EP83107991A EP83107991A EP0103741A2 EP 0103741 A2 EP0103741 A2 EP 0103741A2 EP 83107991 A EP83107991 A EP 83107991A EP 83107991 A EP83107991 A EP 83107991A EP 0103741 A2 EP0103741 A2 EP 0103741A2
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EP
European Patent Office
Prior art keywords
heating
resistor
zone
heating resistor
heating element
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
EP83107991A
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German (de)
French (fr)
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EP0103741B1 (en
EP0103741A3 (en
Inventor
Gerhard Goessler
Eugen Wilde
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.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Gerate Blanc und Fischer GmbH
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Priority claimed from DE19823234349 external-priority patent/DE3234349A1/en
Priority claimed from DE19833314501 external-priority patent/DE3314501A1/en
Application filed by EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Priority to AT83107991T priority Critical patent/ATE38757T1/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
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0202—Switches
    • H05B1/0216—Switches actuated by the expansion of a solid element, e.g. wire or rod
    • 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
    • F24C15/106—Tops, e.g. hot plates; Rings electrically heated electric circuits
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/037—Heaters with zones of different power density
    • 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

  • the invention relates to a heating element, in particular a radiant heating element for heating glass ceramic plates in cooking appliances with at least two separately switchable heating zones with electrical heating resistors.
  • the object of the invention is to provide a heating element which, despite increased performance and good manufacturability, permits uniform heat distribution when both heating zones are switched on.
  • the invention solves this problem in that a heating resistor of one of the heating zones heating resistor of the other heating zone can be connected in series.
  • a high output with high specific heating surface load can be installed in the heating zone, which can be switched on alone, usually the central zone, while a uniform power distribution is achieved when switching over to the total heating surface of the heating element.
  • the series resistor can be arranged in the other, for example outer, heating zone in addition to a further heating resistor which can be connected, for example, in parallel with the middle heating resistor which can be switched on alone.
  • the power distribution can be set as desired; when operating with both heating zones, the specific heating surface load of the central zone can be lower than that of the outer one.
  • This embodiment is particularly suitable for heating elements which deliberately have two different sized or differently designed heating zones which are switched on differently according to the size or shape of the pot.
  • the upstream heating resistor can be connected up to normal power in order to reduce an increased parboiling power provided in the other heating resistor. If the upstream heating resistor closely surrounds a central heating zone containing the other heating resistor, this results in an overall cooking surface which is often not significantly larger than that which is occupied by the heating resistor which can only be switched on.
  • the total cooking surface switched on then has a lower total output than the central zone alone.
  • the outer heating zone can be integrated into an overall winding to the extent that it takes up the outer or, in special cases, the inner turn or double turn of the spirally laid turns of both heating zones.
  • DE-A-30 07 037 also shows, in the case of heating elements with two heating zones, in accordance with the heat effect on the temperature sensor of a temperature limiter which is limited to only a certain area in a heating zone, to equip it with switches of different response temperature in order to switch off at a comparable surface temperature To reach glass ceramic plate. It is then it is necessary to lay four supply lines between the control unit and the heating element and to design the switch for the second heating zone as a double switch. If, in a particularly preferred exemplary embodiment of the invention, a temperature limiter is provided with two contacts of different response temperature, of which the one with a low response temperature is designed as a changeover contact, this problem is solved.
  • the changeover switch switches while the individually to be switched on heating element when reaching the lower adjusted response temperature of a current branch before Zuschalter to a current branch behind the Zuschalter in a way, that it is turned off in isolation circuit, but at one - chalcones both heating zones tung again with its, if appropriate, reduced power is switched on by the series resistor.
  • This circuit only requires three hotplate feed lines and a simple switch for connecting the second heating zone.
  • a radiant heating element 11 is shown for a glass ceramic hotplate of a cooker. It contains on an insulating support 12 heating resistors 13, 14, 15, which consist of wire coils, which are attached in the form of circular arcs, spirals or double spirals on the surface of the insulating support.
  • the central heating zone 16 contains the heating resistor 13 and is surrounded by an annular heating zone 17 with a much larger total area, in which a main heating resistor 14 is arranged in the form of an annular loop with four coils running parallel to one another, but between the two outer strands
  • the heating resistor 15 is arranged in the form of a simple, curved loop over a sector of, for example, 60 ° and there supplements the main heating resistor 14 to the four strands.
  • a rod-shaped temperature sensor 18 of a temperature limiter 19 protrudes diametrically over both heating zones 16, 17 and protects the glass ceramic plate from harmful overheating by switching off the heating resistors.
  • the temperature limiter contains two switching contacts 20, 21 which are adjusted to different response points and of which the contact 21 is a changeover contact.
  • a clocking power control device 22 is used to control the power. It contains a bimetal 23 which is heated by a control heating resistor 24 and which acts on a switch 25, the power which is thereby clocked in different relative operating times being adjustable via an adjusting knob 26.
  • the outer heating zone 17 can be activated by an additional switch 27.
  • the power supply to the heating element 11 takes place via the switch 25 and the contact 20 of the temperature limiter 19 adjusted to a higher temperature.
  • the heating resistors 14 and 13 are connected to this branch 28.
  • the other end of the central heating resistor 13 leaves to the other switching contact 21 of the temperature limiter and can be branched there to two connections, on the one hand with the other network pole 29 and on the other hand with a supply line 30 to the series heating resistor 15 in connection.
  • the other ends of the heating resistors 14, 15 are put together at the switch 27.
  • the outer heating zone 17 is switched on via the additional switch 27, the unimpeded power of the heating resistor 13, for example 900 watts, and the power of the heating resistor 14 (for example 1400 watts) is switched on when the heating element was previously cold, that is to say not yet responding contact 21, so that a high total power is switched on for parboiling. Since the entire temperature sensor length is now heated, contact 21 is switched much earlier, ie at a temperature significantly below the limit temperature. By switching over to contact 31, heating resistor 15 is now connected in series to heating resistor 13, so that the power of heating resistor 13 is considerably reduced (for example to 650 watts), while the outer heating zone has a relatively small proportion of power due to the pre-heating resistor 15 will be added.
  • the specific heating surface loads can be adapted to the circumstances by appropriately dimensioning the heating resistors. In any case, it is possible to achieve a uniform specific heating surface load over the entire surface, or even to choose a lower one in the central area.
  • the contact 20 switches off the total power and switches it on again when the temperature drops.
  • the arrangement of the heating resistors can be different.
  • the arrangement of the cut-in heating resistor 15 which is limited to a ring segment, this could also be arranged, for example, as a turn running around the entire heating element, for example as the inner turn.
  • the advantage remains that not only the output of the other heating zone is reduced by the series heating resistor, but also the additional heating zone 17 receives an additional output by the series heating resistor.
  • the arrangement can also be useful in a configuration other than circularly concentric, for example in a rectangular heating element with a central round hotplate and additional heating zones attached on both sides, the elongated rectangular cooking surfaces being mostly used for heating and therefore a uniform power distribution is particularly important.
  • the temperature limiter described has the advantage that the switch options described are possible with only one additional switch 27 as a result of the changeover switch 21, because when the lower response temperature is reached, the changeover switch switches the heating resistor 13, which was previously only switched on, in parallel with the heating resistor 14. Heating resistor 15 is connected upstream. This advantage also results without using the series heating resistor_ for heating elements with two separately switchable heating resistors and a temperature limiter with two different response temperatures. It is also possible to connect a plurality of heating resistors for more than two heating zones individually or in parallel, preferably with a series heating resistor.
  • FIG. 2 shows a home element in which there are two heating zones 16a, 17a, but which are not as clearly separated from one another as in FIG. 1. As in FIG. 1, they are not intended to heat pots of different sizes , but are assigned to a cooktop of uniform size. Accordingly, the bowl-shaped insulating body 35, in which the heating resistors 13a, 15a are arranged, also has no internal subdivisions, but only an edge 36 surrounding the common hotplate formed from both heating zones, which lies against the underside of the glass ceramic plate.
  • both heating elements are in the form of a double spiral, i.e. a spiral with two parallel turns in the reverse turns in the middle of the heating element.
  • the outer heating resistor extends between a terminal 37 and a tap 38, which is formed by an inserted connecting pin between the heating resistors 13a, 15a, while the central main heating resistor 13a is connected between a terminal 39 on the inside of the outer double turn and the tap 38 .
  • a temperature limiter 19a is provided, the rod temperature sensor 18a of which projects somewhat eccentrically over both heating zones 16a, 17a.
  • the temperature limiter 19a has only a simple switching contact, which is opened when the response temperature is reached.
  • the strong power concentration in the heating area is also less critical, because in this.
  • the service life of the heating elements is also surprisingly good.
  • the switch 27 is preferably operated manually, but could also be operated thermally or by a timer.

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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)
  • Electric Stoves And Ranges (AREA)
  • Control Of Resistance Heating (AREA)

Abstract

Ein elektrischer Strahlheizkörper (11) hat zwei zueinander konzentrische Heizzonen (16, 17) mit unabhängig voneinander schaltbaren Heizwiderständen (13,14,15). Bei Einzeleinschaltung der Mittelzone (16) hat der zugehörige Heizwiderstand (13) eine recht hohe Leistung, die bei Zuschaltung der Außenzone (17) durch Vorschaltung eines Heizwiderstandsteils (15) der Außenzone gemindert werden kann, so daß sich eine gleichmäßige Heizflächenbelastung der Gesamtheizfläche ergibt.An electric radiant heater (11) has two concentric heating zones (16, 17) with heating resistors (13, 14, 15) that can be switched independently of one another. When the central zone (16) is switched on individually, the associated heating resistor (13) has a very high output, which can be reduced by connecting a heating resistor part (15) of the outer zone when the outer zone (17) is switched on, so that there is a uniform heating surface load on the entire heating surface.

Ein Temperaturbegrenzer (19) ragt mit seinem Temperaturfühler (18) über die Heizfläche hinweg und hat zwei bei unterschiedlichen Temperaturen schaltende Kontakte (20, 21) von denen einer ein Umschaltkontakt (21) ist.

Figure imgaf001
A temperature limiter (19) projects with its temperature sensor (18) over the heating surface and has two contacts (20, 21) that switch at different temperatures, one of which is a changeover contact (21).
Figure imgaf001

Description

Die Erfindung betrifft ein Heizelement, insbesondere Strahlungsheizelement für die Beheizung von Glaskeramikplatten in Kochgeräten mit wenigstens zwei gesondert schaltbaren Heizzonen mit elektrischen Heizwiderständen.The invention relates to a heating element, in particular a radiant heating element for heating glass ceramic plates in cooking appliances with at least two separately switchable heating zones with electrical heating resistors.

Aus der DE-A-30 07 037 ist ein Heizelement mit zwei konzentrischen Heizzonen bekannt geworden. Es ist erwünscht, die Leistung der mittleren Heizzone kräftig zu erhöhen, um bei kleinen Kochgefäßen eine kurze Ankochzeit zu erreichen. Eine Gesamtleistung über einer bestinmten Grenze, beispielsweise 2100 W,ist nicht möglich, wenn die Steuerung mit einem taktenden Leistungssteuergerät vorgenommen werden soll. Die hohen Ein- und Ausschaltströme und die notwendige Schaltfrequenz belasten das Stromnetz unzulässig. Erhöht man die Leistung der mittleren Heizzone auf Kosten der anderen, ergibt sich bei Zusammenschaltung eine ungünstige Wärmeverteilung. Ferner sind Heizwiderstände mit zu kleiner Leistung für höhere Spannungen, insbesondere 380 V, schwer herzustellen, weil die Drähte zu dünn werden und sich schlecht auf dem Isolierkörper des Heizelementes befestigen lassen.From DE-A-30 07 037 a heating element with two concentric heating zones has become known. It is desirable to increase the output of the central heating zone vigorously in order to achieve a short heating-up time for small cooking vessels. A total power above a certain limit, for example 2100 W, is not possible if the control is to be carried out with a clocking power control device. The high switch-on and switch-off currents and the necessary switching frequency impose an unacceptable burden on the power grid. Increasing the performance of the central heating zone at the expense the other, there is an unfavorable heat distribution when interconnected. Furthermore, heating resistors with too little power for higher voltages, in particular 380 V, are difficult to manufacture because the wires become too thin and are difficult to attach to the insulating element of the heating element.

Aufgabe der Erfindung ist es, ein Heizelement zu schaffen, das trotz erhöhter Leistung bei guter Herstellbarkeit eine gleichmäßige Wärmeverteilung bei Einschaltung beider Heizzonen erlaubt.The object of the invention is to provide a heating element which, despite increased performance and good manufacturability, permits uniform heat distribution when both heating zones are switched on.

Die Erfindung löst diese Aufgabe dadurch, daß ein Heizwiderstand einer der Heizzonendem Heizwiderstand der anderen Heizzone in Reihe vorschaltbar ist.The invention solves this problem in that a heating resistor of one of the heating zones heating resistor of the other heating zone can be connected in series.

Dadurch kann in der-allein einschaltbaren Heizzone, meist der Mittelzone, eine hohe Leistung bei hoher spezifischer Heizflächenbelastung installiert werden, während bei Umschaltung auf die Gesamtheizfläche des Heizelementes eine gleichmäßige Leistungsverteilung erreicht wird. Dazu kann bei einem bevorzugten Ausführungsbeispiel der Vorschaltwiderstand in der anderen, beispielsweise äußeren Heizzone zusätzlich zu einem weiteren Heizwiderstand angeordnet sein, der mit dem allein einschaltbaren, mittleren Heizwiderstand beispielsweise parallel geschaltet sein kann. Die Leistungsverteilung ist dabei beliebig einzustellen; so kann beim Betrieb mit beiden Heizzonen die spezifische Heizflächenbelastung der Mittelzone geringer sein als die der äußeren. Diese Ausführungsform ist insbesondere für Heizelemente geeignet, die bewußt zwei verschieden große oder unterschiedlich gestaltete Heizzonen haben, die entsprechend der Topfgröße oder -form unterschiedlich eingeschaltet werden.As a result, a high output with high specific heating surface load can be installed in the heating zone, which can be switched on alone, usually the central zone, while a uniform power distribution is achieved when switching over to the total heating surface of the heating element. For this purpose, in a preferred exemplary embodiment, the series resistor can be arranged in the other, for example outer, heating zone in addition to a further heating resistor which can be connected, for example, in parallel with the middle heating resistor which can be switched on alone. The power distribution can be set as desired; when operating with both heating zones, the specific heating surface load of the central zone can be lower than that of the outer one. This embodiment is particularly suitable for heating elements which deliberately have two different sized or differently designed heating zones which are switched on differently according to the size or shape of the pot.

Die Anordnung von zwei Heizzonen, die dann allerdings im Betrieb kaum voneinander getrennt sind, kann jedoch auch bei einem Heizelement sinnvoll sein, bei dem die Allein-Einschaltung eines Heizwiderstandes einer Leistungserhöhung in einer Ankochphase oder dergleichen dient. Dazu kann erfindungsgemäß der vorschaltbare Heizwiderstand zur Minderung einer in dem anderen Heizwiderstand vorgesehenen erhöhten Ankochleistung auf Normalleistung vorschaltbar sein. Wenn dabei der vorschaltbare Heizwiderstand eine mittlere, den anderen Heizwiderstand enthaltende Heizzone eng umgibt, so ergibt sich eine Gesamtkochfläche, die oft nicht wesentlich größer ist, als die, die vom allein einschaltbaren Heizwiderstand eingenommen wird. Trotzdem kann dabei in einem Ankochbereich eine erhöhte konzentriertere Leistung geschaffen werden, die im Zusammenwirken mit den in diesem Zustand auch noch kalten Kochgefäßen und der damit stärkeren Kühlung der Glaskeramikplatte auch einen erhöhten Leistungsdurchsatz bewirkt. Die eingeschaltete Gesamtkochfläche hat dann eine geringere Gesamtleistung als vorher die Mittelzone allein. Die äußere Heizzone kann insofern in eine Gesamtwicklung integriert sein, daß sie die äußere oder in Sonderfällen auch die innere Windung bzw. Doppelwindung der spiralförmig gelegten Windungen beider Heizzonen einnimmt.The arrangement of two heating zones, which are then hardly separated from one another during operation, can, however, also make sense in the case of a heating element in which the switching on of a heating resistor alone serves to increase the power in a heating-up phase or the like. For this purpose, according to the invention, the upstream heating resistor can be connected up to normal power in order to reduce an increased parboiling power provided in the other heating resistor. If the upstream heating resistor closely surrounds a central heating zone containing the other heating resistor, this results in an overall cooking surface which is often not significantly larger than that which is occupied by the heating resistor which can only be switched on. Nevertheless, an increased, more concentrated output can be created in a parboiling area, which in combination with the cooking vessels, which are still cold in this state and the stronger cooling of the glass ceramic plate, also results in an increased output throughput. The total cooking surface switched on then has a lower total output than the central zone alone. The outer heating zone can be integrated into an overall winding to the extent that it takes up the outer or, in special cases, the inner turn or double turn of the spirally laid turns of both heating zones.

Die DE-A-30 07 037 zeigt auch, bei Heizelementen mit zwei Heizzonen,entsprechend der bei einer Heizzone nur auf einen bestimmten Bereich beschränkten Wärmeeinwirkung auf-den Temperaturfühler eines Temperaturbegrenzers,diesen mit Schaltern unterschiedlicher Ansprechtemperatur auszurüsten, um eine Abschaltung bei vergleichbarer Oberflächentemperatur der Glaskeramikplatte zu erreichen. Dabei ist es dann nötig, zwischen dem Steuergerät und dem Heizelement vier Zuleitungen zu verlegen und den Zuschalter für die zweite Heizzone als Doppelschalter auszubilden. Wenn bei einem besonders bevorzugten Ausführungsbeispiel der Erfindung ein Temperaturbegrenzer mit zwei Kontakten unterschiedlicher Ansprechtemperatur vorgesehen ist, von denen der mit niedriger Ansprechtemperatur als Umschaltkontakt ausgebildet ist, wird dieses Problem gelöst. Der Umschalter schaltet dabei den auch einzeln einzuschaltenden Heizwiderstand bei Erreichen der niedriger justierten Ansprechtemperatur von einem Stromzweig vor dem Zuschalter auf einen Stromzweig hinter dem Zuschalter um, so daß er in Alleinschaltung ausgeschaltet ist, jedoch bei Eins-chal- tung beider Heizzonen wieder mit seiner gegebenenfalls durch den Vorwiderstand erniedrigten Leistung eingeschaltet ist. Diese Schaltung benötigt nur drei Kochplattenzuleitungen und einen einfachen Schalter für die Zuschaltung der zweiten Heizzone.DE-A-30 07 037 also shows, in the case of heating elements with two heating zones, in accordance with the heat effect on the temperature sensor of a temperature limiter which is limited to only a certain area in a heating zone, to equip it with switches of different response temperature in order to switch off at a comparable surface temperature To reach glass ceramic plate. It is then it is necessary to lay four supply lines between the control unit and the heating element and to design the switch for the second heating zone as a double switch. If, in a particularly preferred exemplary embodiment of the invention, a temperature limiter is provided with two contacts of different response temperature, of which the one with a low response temperature is designed as a changeover contact, this problem is solved. The changeover switch switches while the individually to be switched on heating element when reaching the lower adjusted response temperature of a current branch before Zuschalter to a current branch behind the Zuschalter in a way, that it is turned off in isolation circuit, but at one - chalcones both heating zones tung again with its, if appropriate, reduced power is switched on by the series resistor. This circuit only requires three hotplate feed lines and a simple switch for connecting the second heating zone.

Weitere Vorteile und Merkmale der Erfindung ergeben sich aus den Unteransprüchen und der Beschreibung im Zusammenhang mit den Zeichnungen. Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher erläutert. Es zeigen:

  • Fig. 1 und 2 schematische Draufsichten und Schaltbilder je eines Heizelementes und seiner Steuerung.
Further advantages and features of the invention emerge from the subclaims and the description in connection with the drawings. Embodiments of the invention are shown in the drawing and are explained in more detail below. Show it:
  • 1 and 2 are schematic top views and circuit diagrams of a heating element and its control.

In der Zeichnung ist ein Strahlungsheizelement 11 für eine Glaskeramikkochplatte eines Kochherdes dargestellt. Es enthält auf einem Isolierträger 12 Heizwiderstände 13, 14, 15, die aus Drahtwendeln bestehen, die in Form von Kreisbögen, Spiralen oder Doppel-Spiralen auf der Oberfläche des Isolierträgers befestigt sind. Sie sind in zwei Heizzonen 16, 17 angeordnet, wobei die mittlere Heizzone 16 den Heizwiderstand 13 enthält und von einer ringförmigen Heizzone 17 mit wesentlich größerer Gesamtfläche umgeben ist, in der ein Haupt-Heizwiderstand 14 in Form einer Ringschlaufe mit vier zueinander parallel verlaufenden Wendeln angeordnet, wobei jedoch zwischen den beiden äußeren Strängen über einen Sektor von beispielsweise 60° der Heizwiderstand 15 in Form einer einfachen, gebogenen Schlaufe angeordnet ist und dort den Haupt-Heizwiderstand 14 auf die vier Stränge ergänzt.In the drawing, a radiant heating element 11 is shown for a glass ceramic hotplate of a cooker. It contains on an insulating support 12 heating resistors 13, 14, 15, which consist of wire coils, which are attached in the form of circular arcs, spirals or double spirals on the surface of the insulating support. They are in two heating zones 16, 17 The central heating zone 16 contains the heating resistor 13 and is surrounded by an annular heating zone 17 with a much larger total area, in which a main heating resistor 14 is arranged in the form of an annular loop with four coils running parallel to one another, but between the two outer strands The heating resistor 15 is arranged in the form of a simple, curved loop over a sector of, for example, 60 ° and there supplements the main heating resistor 14 to the four strands.

Diametral über beide Heizzonen 16, 17 hinweg ragt ein stabförmiger Temperaturfühler 18 eines Temperaturbegrenzers 19, der die Glaskeramikplatte durch Abschaltung der Heizwiderstände vor einer schädlichen Oberhitzung schützt. Der Temperaturbegrenzer enthält zwei Schaltkontakte 20, 21, die auf unterschiedliche Ansprechpunkte justiert sind und von denen der Kontakt 21- ein Umschaltkontakt ist.A rod-shaped temperature sensor 18 of a temperature limiter 19 protrudes diametrically over both heating zones 16, 17 and protects the glass ceramic plate from harmful overheating by switching off the heating resistors. The temperature limiter contains two switching contacts 20, 21 which are adjusted to different response points and of which the contact 21 is a changeover contact.

Ein taktendes Leistungssteuergerät 22 dient zur Steuerung der Leistung. Es enthält ein von einem Steuerheizwiderstand 24 beheiztes Bimetall 23, das auf einen Schalter 25 einwirkt, wobei über einen Einstellknopf 26 die dadurch in unterschiedlicher relativer Einschaltdauer getaktete Leistung einstellbar ist. Durch einen Zusatzschalter 27 ist die äußere Heizzone 17 zuschaltbar.A clocking power control device 22 is used to control the power. It contains a bimetal 23 which is heated by a control heating resistor 24 and which acts on a switch 25, the power which is thereby clocked in different relative operating times being adjustable via an adjusting knob 26. The outer heating zone 17 can be activated by an additional switch 27.

Die Leistungszuführung zum Heizelement 11 erfolgt über den Schalter 25 und den auf eine höhere Temperatur justierten Kontakt 20 des Temperaturbegrenzers 19. An diesen Zweig 28 sind die Heizwiderstände 14 und 13 geschaltet. Das andere Ende des mittleren Heizwiderstandes 13 läußt zum anderen Schaltkontakt 21 des Temperaturbegrenzers und kann dort auf zwei Anschlüsse verzweigt werden, die einerseits mit dem anderen Netzpol 29 und andererseits mit einer Zuleitung 30 zu dem Vorschalt-Heizwiderstand 15 in Verbindung stehen. Die jeweils anderen Enden der Heizwiderstände 14, 15 sind zusammen an den Schalter 27 gelegt.The power supply to the heating element 11 takes place via the switch 25 and the contact 20 of the temperature limiter 19 adjusted to a higher temperature. The heating resistors 14 and 13 are connected to this branch 28. The other end of the central heating resistor 13 leaves to the other switching contact 21 of the temperature limiter and can be branched there to two connections, on the one hand with the other network pole 29 and on the other hand with a supply line 30 to the series heating resistor 15 in connection. The other ends of the heating resistors 14, 15 are put together at the switch 27.

Die Funktion des-Heizelementes ist wie folgt (Fig. 1):

  • Bei geöffnetem Schalter 27 wird lediglich die mittlere Heizzone 16 betrieben, beispielsweise wenn nur ein kleiner Topf erwärmt werden soll. Bei Einschaltung des Leistungssteuergerätes über den Einstellknopf 26 wird der Schalter 25 geschlossen und über den geschlossenen Kontakt 20 des Temperaturbegrenzers 19-und den in der in der Zeichnung dargestellten Lage befindlichen Umschaltkontakt 21 wird die mittlere Heizzone mit ihrer vollen Leistung betrieben, die beispielsweise ca. 40 bis 50 % der Gesamtleistung des Heizelementes betragen kann. Dadurch wird eine relativ schnelle Erwärmung des kleinen Kochgefäßes erzielt. Die mittlere Heizzone 16 heizt nur den mittleren Teil des Temperaturfühlers 18 auf volle Temperatur auf, so daß die resultierende Ausdehnung des Temperaturfühlers geringer ist, als bei vollständiger Beaufschlagung des Temperaturfühlers. Da c Umschaltkontakt auf einen niedrigeren Ansprechpunkt justiert ist, schaltet der Heizwiderstand 13 trotzdem bei der richtigen Begrenzungstemperatur ab. Der Umschaltkontakt 21 schaltet dann auf den Kontakt 31 um.
The function of the heating element is as follows (Fig. 1):
  • When the switch 27 is open, only the central heating zone 16 is operated, for example if only a small pot is to be heated. When the power control device is switched on using the setting button 26, the switch 25 is closed and the closed contact 20 of the temperature limiter 19 and the changeover contact 21 in the position shown in the drawing operate the middle heating zone with its full power, for example approx. 40 can be up to 50% of the total output of the heating element. As a result, the small cooking vessel heats up relatively quickly. The average heating zone 16 heats only the central part of the temperature sensor 18 to full temperature so that the resulting expansion of the Tem p eraturfühlers is lower than at full impingement of the temperature sensor. Since c changeover contact is adjusted to a lower response point, the heating resistor 13 nevertheless switches off at the correct limiting temperature. The switch contact 21 then switches to the contact 31.

Wenn die äußere Heizzone 17 über den Zusatzschalter 27 eingeschaltet wird, so wird bei vorher kaltem Heizelement, d.h. noch nicht ansprechendem Kontakt 21, die ungeminderte Leistung des Heizwiderstandes 13, beispielweise 900 Watt, und die Leistung des Heizwiderstandes 14 (z.B. 1400 Watt) eingeschaltet, so daß eine hohe Gesamtleistung zum Ankochen eingeschaltet ist. Da jetzt die gesamte Temoeraturfühlerlänge beheizt wird, erfolgt die Umschaltung des Kontaktes 21 wesentlich früher, d.h. bei einer wesentlich unter der Begrenzungstemperatur liegenden Temperatur. Durch die Umschaltung auf den Kontakt 31 wird jetzt dem Heizwiderstand 13 der Heizwiderstand 15 in Reihe vorgeschaltet, so daß die Leistung des Heizwiderstandes 13 erheblich gemindert wird(beispielsweise auf 650 Watt), während der äußeren Heizzone ein wenn auch relativ geringer Leistungsanteil durch den Vorschaltheizwiderstand 15 hinzugefügt wird. Durch die entsprechende Bemessung der Heizwiderstände können die spezifischen Heizflächenbelastungen den Gegebenheiten angepaßt werden. In jedem Falle ist es aber möglich, eine gleichmäßige spezifische Heizflächenbelastung über die gesamte Fläche zu erzielen, oder sie im Mittelbereich sogar niedriger zu wählen.If the outer heating zone 17 is switched on via the additional switch 27, the unimpeded power of the heating resistor 13, for example 900 watts, and the power of the heating resistor 14 (for example 1400 watts) is switched on when the heating element was previously cold, that is to say not yet responding contact 21, so that a high total power is switched on for parboiling. Since the entire temperature sensor length is now heated, contact 21 is switched much earlier, ie at a temperature significantly below the limit temperature. By switching over to contact 31, heating resistor 15 is now connected in series to heating resistor 13, so that the power of heating resistor 13 is considerably reduced (for example to 650 watts), while the outer heating zone has a relatively small proportion of power due to the pre-heating resistor 15 will be added. The specific heating surface loads can be adapted to the circumstances by appropriately dimensioning the heating resistors. In any case, it is possible to achieve a uniform specific heating surface load over the entire surface, or even to choose a lower one in the central area.

Bei Erreichen der Begrenzungstemperatur schaltet der Kontakt 20 die Gesamtleistung ab und bei absinkender Temperatur wieder ein.When the limit temperature is reached, the contact 20 switches off the total power and switches it on again when the temperature drops.

Von der dargestellten Ausführungsform sind zahlreiche Abwandlungen möglich. So kann beispielsweise die Anordnung der Heizwiderstände unterschiedlich sein. Statt der auf ein Ringsegment begrenzten Anordnung des Zuschalt-Heizwiderstandes 15 könnte dieser beispielsweise auch als eine um das gesamte Heizelement umlaufende Windung,beispielsweise als die innere-Windung, angeordnet sein. In jedem Falle bleibt der Vorteil, daß durch den Vorschalt-Heizwiderstand nicht nur die- Leistung der anderen Heizzone gemindert wird, sondern auch die Zuschaltheizzone 17 eine zusätzliche Leistung durch den Vorschalt-Hetzwiderstand erhält.Numerous modifications are possible from the illustrated embodiment. For example, the arrangement of the heating resistors can be different. Instead of the arrangement of the cut-in heating resistor 15, which is limited to a ring segment, this could also be arranged, for example, as a turn running around the entire heating element, for example as the inner turn. In any case, the advantage remains that not only the output of the other heating zone is reduced by the series heating resistor, but also the additional heating zone 17 receives an additional output by the series heating resistor.

Die Anordnung kann auch bei anderer als kreisförmig konzentrischer Anordnung brauchbar sein, beispielsweise bei einem Rechteckheizkörper mit einer zentralen runden Kochstelle und an beiden Seiten angesetzten Zusatzheizzonen, wobei die langgestreckt rechteckigen Kochflächen meist zum Wärmen benutzt werden und daher eine gleichmäßige Leistungsverteilung besonders wichtig ist.The arrangement can also be useful in a configuration other than circularly concentric, for example in a rectangular heating element with a central round hotplate and additional heating zones attached on both sides, the elongated rectangular cooking surfaces being mostly used for heating and therefore a uniform power distribution is particularly important.

Der beschriebene Temperaturbegrenzer hat den Vorteil, daß durch den Umschalter 21 die beschriebenen Schaltmöglichkeiten mit nur einem Zusatzschalter 27 möglich sind, da der Umschalter beim Erreichen der niedrigeren Ansprechtemperatur den vorher allein eingeschalteten Heizwiderstand 13 dem Heizwiderstand 14. parallel schaltet, wobei ihm selbst der Vorschalt-Heizwiderstand 15 vorgeschaltet wird. Auch ohne Verwendung des Vorschalt-Heizwiderstandes ergibt sich dieser Vorteil_bei Heizelementen mit zwei gesondert schaltbaren Heizwiderständen und einem Temperaturbegrenzer mit zwei verschiedenen Ansprechtemperaturen. Es ist auch möglich, vorzugsweise jeweils unter Vorschaltung eines Vorschalt-Heizwiderstandes, mehrere Heizwiderstände für mehr als zwei Heizzonen auf diese Weise einzeln bzw. parallel zu schalten.The temperature limiter described has the advantage that the switch options described are possible with only one additional switch 27 as a result of the changeover switch 21, because when the lower response temperature is reached, the changeover switch switches the heating resistor 13, which was previously only switched on, in parallel with the heating resistor 14. Heating resistor 15 is connected upstream. This advantage also results without using the series heating resistor_ for heating elements with two separately switchable heating resistors and a temperature limiter with two different response temperatures. It is also possible to connect a plurality of heating resistors for more than two heating zones individually or in parallel, preferably with a series heating resistor.

Fig. 2 zeigt ein Heimlement, bei dem zwar zwei Heizzonen 16a, 17a vorhanden sind, die jedoch nicht so deutlich voneinander getrennt sind wie bei Fig. 1. Sie sind nicht, wie in Fig. 1. dazu gedacht, Töpfe unterschiedlicher Größe zu beheizen, sondern sind einer Kochstelle von einheitlicher Größe zugeordnet. Dementsprechend hat der schüsselförmige Isolierkörper 35, in dem die Heizwiderstände 13a, 15a angeordnet sind auch keine inneren Unterteilungen,sondern nur einen die aus beiden Heizzonen gebildete gemeinsame Kochstelle umgebenden Rand 36, der an der Unterseite der Glaskeramikplatte anliegt.FIG. 2 shows a home element in which there are two heating zones 16a, 17a, but which are not as clearly separated from one another as in FIG. 1. As in FIG. 1, they are not intended to heat pots of different sizes , but are assigned to a cooktop of uniform size. Accordingly, the bowl-shaped insulating body 35, in which the heating resistors 13a, 15a are arranged, also has no internal subdivisions, but only an edge 36 surrounding the common hotplate formed from both heating zones, which lies against the underside of the glass ceramic plate.

Bei gleichem Aufbau der Steuerschaltung 22 wie in Fig. 1 (gleiche Teile tragen gleiche Bezugszeichen), ist die Anordnung der Heizwiderstände so, daß der innere Heizwiderstand 13a den größten Teil der Fläche einnimmt, während der äußere Heizwiderstand 15a praktisch auf die äußere Windung beschränkt ist. Dazu sind im Ausführungsbeispiel beide Heizelemente durchgehend in Form einer Doppelspirale, d.h. einer Spirale mit zwei parallelen, in der in der Heizelementmitte umkehrenden Windungen gelegt. Der äußere Heizwiderstand erstreckt sich zwischen einem Anschluß 37 und einer Anzapfung 38, die durch einen eingesetzten Verbindungsstift zwischen den Heizwiderständen 13a, 15a gebildet ist, während der mittlere Haupt-Heizwiderstand 13a zwischen einem Anschluß 39 am Inneren der äußeren Doppelwindung und der Anzapfung 38 angeschlossen ist.With the same structure of the control circuit 22 as in Fig. 1 (same parts have the same reference numerals), the arrangement of the heating resistors is such that the inner heating resistor 13a takes up most of the area, while the outer heating resistor 15a is practically limited to the outer winding . For this purpose, in the exemplary embodiment, both heating elements are in the form of a double spiral, i.e. a spiral with two parallel turns in the reverse turns in the middle of the heating element. The outer heating resistor extends between a terminal 37 and a tap 38, which is formed by an inserted connecting pin between the heating resistors 13a, 15a, while the central main heating resistor 13a is connected between a terminal 39 on the inside of the outer double turn and the tap 38 .

Es ist ein Temperaturbegrenzer 19a vorgesehen, dessen Stab-Temperaturfühler 18a etwas außermittig über beide Beheizzonen 16a, 17a ragt. Der Temperaturbegrenzer 19a hat nur einen einfachen Schaltkontakt, der bei Erreichen der Ansprechtemperatur geöffnet wird.A temperature limiter 19a is provided, the rod temperature sensor 18a of which projects somewhat eccentrically over both heating zones 16a, 17a. The temperature limiter 19a has only a simple switching contact, which is opened when the response temperature is reached.

Die Funktion ist wie folgt (Fig. 2):

  • Wenn der Schalter 27 geschlossen ist, ist der Heizwiderstand 13a allein eingeschaltet, der eine vergleichsweise große Leistung hat. Sie entspricht einer Ankochleistung, d.h. einer höheren Leistung als das Heizelement im Dauerzustand haben soll. Der Draht, aus dem die Heizwendel 13a besteht, kann daher relativ dick sein und ist somit leicht zu verlegen und thermisch und mechanisch dauerhaft. Diese Leistung wird nach dem Ansprechen des Leistungssteuergerätes 23, 24, 25 entsprechend dem eingestellten Leistungswert getaktet. Wenn der Schalter 27 geöffnet wird, so ist der vorher kurzgeschlossene Heizwiderstand 15a in Reihe vor den Heizwiderstand 13a geschaltet, so daß beide Heizwiderstände nun zusammen eine geringere Leistung haben als der Hetzwiderstand 13a allein. Bei dieser Stellung sind also beide Heizzonen 16a, 17a eingeschaltet und es ergibt sich eine gleichmäßiger verteilte, jedoch niedrigere Leistung, die zum Fortkochen verwendet wird.
The function is as follows (Fig. 2):
  • When the switch 27 is closed, the heating resistor 13a alone is switched on, which has a comparatively large output. It corresponds to a parboiling power, ie a higher power than the heating element should have in the permanent state. The wire from which the heating coil 13a is made can therefore be relatively thick and is therefore easy to lay and thermally and mechanically durable. These Power is clocked according to the response of the power control device 23, 24, 25 according to the set power value. When the switch 27 is opened, the previously short-circuited heating resistor 15a is connected in series in front of the heating resistor 13a, so that both heating resistors together now have a lower output than the heating resistor 13a alone. In this position, both heating zones 16a, 17a are switched on and the result is a more evenly distributed but lower power which is used for continued cooking.

Obwohl es auf den ersten Blick sinnwidrig erscheint, die größere Leistung auf einen kleineren Bereich, nämlich die innere Heizzone 16a, zu beschränken und bei der niedrigeren Leistung die größere Fläche, nämlich beide Heizzonen 16a, 17a zusammen, zu verwenden, ergibt sich, daß außer den Herstellungsvorteilen auch Betriebsvorteile auftreten. Obwohl bei-der Ankochleistung die kleinere Abstrahl fläche zur Verfügung steht, hat sich in Versuchen gezeigt, daß sich die Ankochzeit nicht verlängert. Der in Alleinschaltung relativ hoch belastete Heizwiderstand 13a kommt sehr schnell zum Glühen, so daß die dem Heizelement innewohnende Totzeit merklich abgekürzt wird. Ferner wird der Temperaturbegrenzer 19a in seinem randnahen Bereich weniger schnell aufgeheizt und es ergibt sich eine etwas verzögerte Abschaltung, die noch im Bereich des Zulässigen liegt, aber der Verkürzung der Anheizzeit zugutekommt. Auf der Seite des Kochgefäßes ist ebenfalls die starke Leistungskonzentration im Anheizbereich weniger kritisch, da in diesem. Bereich d.ie Speisen noch kalt sind und nicht zum Ankochen oder teilweisenVerbrennen neigen, während im Fortkochbereich, wenn dies kritisch wird, die vergleichmäßig niedrigere Leistung vorliegt. Auch die Lebensdauer der Heizelemente ist überraschend gut. Trotz der starken Belastung des Heizwiderstandes 13a während der Ankochphase wirkt sich dies nicht lebensdauermindernd aus, weil diese Zeit meist sehr kurz ist. Der Schalter 27 wird vorzugsweise manuell betätigt, könnte aber auch thermisch oder durch ein Zeitschaltwerk betätigt werden.Although at first glance it seems senseless to limit the larger output to a smaller area, namely the inner heating zone 16a, and to use the larger area, namely both heating zones 16a, 17a together at the lower output, it results that except operational advantages also occur in the manufacturing advantages. Although the smaller radiation area is available for the parboiling power, tests have shown that the parboiling time is not extended. The heating resistor 13a, which is relatively highly loaded when switched on its own, glows very quickly, so that the dead time inherent in the heating element is markedly shortened. Furthermore, the temperature limiter 19a is heated up less quickly in its region near the edge, and there is a somewhat delayed switch-off, which is still within the permissible range, but which helps to shorten the heating-up time. On the side of the cooking vessel, the strong power concentration in the heating area is also less critical, because in this. The area where the food is still cold and does not tend to boil or partially burn, while in the continued cooking area, if this becomes critical, the comparatively lower output is present. The service life of the heating elements is also surprisingly good. Despite the strong Loading the heating resistor 13a during the parboiling phase does not reduce the lifespan, because this time is usually very short. The switch 27 is preferably operated manually, but could also be operated thermally or by a timer.

Claims (10)

1. Heizelement, insbesondere Strahlungs-Heizelement (11) für die Beheizung von Glaskeramikplatten in Kochgeräten mit wenigstens zwei gesondert schaltbaren Heizzonen (16, 17) mit elektrischen Heizwiderständen (13, 13a, 14, 15, 15a),dadurch gekennzeichnet, daß ein Heizwiderstand (15, 15a) einer der Heizzonen (17, 17a) einem Heizwiderstand (13, 13a) der anderen Heizzone (16, 16a) in Reihe vorschaltbar ist.1. Heating element, in particular radiation heating element (11) for heating glass ceramic plates in cooking appliances with at least two separately switchable heating zones (16, 17) with electrical heating resistors (13, 13a, 14, 15, 15a), characterized in that a heating resistor (15, 15a) one of the heating zones (17, 17a) can be connected in series with a heating resistor (13, 13a) of the other heating zone (16, 16a). 2. Heizelement nach Anspruch 1, dadurch gekennzeichnet, daß der vorschaltbare Heizwiderstand (15, 15a) zu einer Heizzone (17, 17a) gehört, die als Zuschalt-Heizzone zu der anderen, in Betrieb stets eingeschalteten Heizzone (16, 16a) einschaltbar ist.2. Heating element according to claim 1, characterized in that the upstream heating resistor (15, 15a) belongs to a heating zone (17, 17a) which can be switched on as an additional heating zone to the other heating zone (16, 16a) which is always switched on during operation . 3. Heizelement nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß eine Heizzone (17, 17a) die andere Heizzone (16, 16a) umgibt, wobei vorzugsweise die äußere Heizzone (17, 17a) den vorschaltbaren Heizwiderstand (15, 15a) enthält.3. Heating element according to claim 1 or 2, characterized in that one heating zone (17, 17a) surrounds the other heating zone (16, 16a), preferably the outer heating zone (17, 17a) containing the upstream heating resistor (15, 15a). 4. Heizelement nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der vorschaltbare Heizwiderstand (15) zusätzlich zu einem weiteren Heizwiderstand (14) in seiner Heizzone (17) vorgesehen ist, wobei insbesondere bei vorgeschaltetem Heizwiderstand (15) die spezifische Heizflächenbelastung der Zuschalt- Heizzone (17) gleich oder vorzugsweise größer ist als die spezifische Heizflächenbelastung der anderen Heizzone (16).4. Heating element according to one of the preceding claims, characterized in that the pre-switchable heating resistor (15) is provided in addition to a further heating resistor (14) in its heating zone (17), the specific heating surface load of the connection, in particular in the case of an upstream heating resistor (15). Heating zone (17) is equal to or preferably greater than the specific heating surface load of the other heating zone (16). 5. Heizelement nach Anspruch 4, dadurch gekennzeichnet, daß der vorschaltbare Heizwiderstand (15) einen Teil des Umfanges und/oder der radialen Erstreckung der Zuschalt- Heizzone (17) einnimmt und vorzugsweise gesondert von dem übrigen Heizwiderstand (14) der entsprechenden Heizzone (17) angeordnet ist.5. Heating element according to claim 4, characterized in that the upstream heating resistor (15) occupies part of the circumference and / or the radial extent of the switch-on heating zone (17) and preferably separately from the remaining heating resistor (14) of the corresponding heating zone (17 ) is arranged. 6. Heizelement nach Anspruch 1, dadurch gekennzeichnet, daß der vorschaltbare Heizwiderstand (15a) zur Minderung einer in dem anderen Heizwiderstand (13a) vorgesehenen erhöhten Ankochleistung auf Normalleistung vorschaltbar ist.6. Heating element according to claim 1, characterized in that the upstream heating resistor (15a) can be connected up to normal power in order to reduce a heating power provided in the other heating resistor (13a). 7. Heizelement nach Anspruch 6, dadurch gekennzeichnet, daß der vorschaltbare Heizwiderstand (15a) eine mittlere, den anderen Heizwiderstand (13a) enthaltende Heizzone (16a) eng umgibt, wobei vorzugsweise der vorschaltbare Heizwiderstand (15a) die äußere Windung einer in Form einer Spirale oder Doppelspirale gelegten Heizwendel ist.7. Heating element according to claim 6, characterized in that the series heating resistor (15a) closely surrounds a central heating zone (16a) containing the other heating resistor (13a), preferably the series heating resistor (15a) the outer turn of a spiral or double spiral heating coil. 8. Heizelement, insbesondere nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß sich über beide Heizzonen (16, 17 ) des Heizelementes der Temperaturfühler eines Temperaturbegrenzers (19) mit zwei Kontakten (20, 21) unterschiedlicher Ansprechtemperatur erstreckt, von denen der mit niedrigerer Ansprechtemperatur als Umschaltkontakt (21) ausgebildet ist, wobei vorzugsweise bei konzentrisch angeordneten Heizzonen (16, 17) dem Heizwiderstand (13) der inneren Heizzone (16) der Schalter (21) mit der niedrigsten Schalttemperatur zugeordnet ist.8. Heating element, in particular according to one of the preceding claims, characterized in that extends over both heating zones (16, 17) of the heating element, the temperature sensor of a temperature limiter (19) with two contacts (20, 21) of different response temperature, of which the lower Response temperature is designed as a changeover contact (21), the switch (21) with the lowest switching temperature being preferably assigned to the heating resistor (13) of the inner heating zone (16) in the case of concentrically arranged heating zones (16, 17). 9. Heizelement nach Anspruch 8, dadurch gekennzeichnet, daß der Umschaltkontakt (21) in einer Ankochphase die Haupt-Heizwiderstände (13, 14) beider Heizzonen (16, 17) parallel schaltet und bei seinem Umschalten dem einen Heizwiderstand (13) den vorschaltbaren Heizwiderstand (15) in Reihe vorschaltet.9. Heating element according to claim 8, characterized in that the changeover contact (21) in a parboiling phase the main heating resistors (13, 14) of the two heating zones (16, 17) in parallel and when switching one heating resistor (13) the upstream heating resistor (15) upstream in series. 10. Heizelement nach Anspruch 8, dadurch gekennzeichnet, daß der Umschaltkontakt (21) in der Zuleitung zu dem zugehörigen Heizwiderstand (13) liegt, als Umschalter ausgebildet ist und bei Erreichen seiner Ansprechtemperatur den ihm zugeordneten Heizwiderstand (13) zum jeweils nächsten Heizwiderstand (14) parallelschaltet, wobei der Schalter (20) mit der höchsten Ansprechtemperatur in Reihe zur gemeinsamen Rückleitung (28) aller Beheizungen (13, 14, 15) liegt.10. Heating element according to claim 8, characterized in that the changeover contact (21) is in the feed line to the associated heating resistor (13), is designed as a switch and when it reaches its response temperature, the heating resistor (13) assigned to it for the next heating resistor (14th) ) in parallel, the switch (20) with the highest response temperature being in series with the common return line (28) of all heaters (13, 14, 15).
EP83107991A 1982-09-16 1983-08-12 Heating element, especially radiant heating element for the heating of ceramic plates Expired EP0103741B1 (en)

Priority Applications (1)

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AT83107991T ATE38757T1 (en) 1982-09-16 1983-08-12 HEATING ELEMENT, ESPECIALLY RADIANT HEATING ELEMENT FOR HEATING GLASS-CERAMIC PLATES.

Applications Claiming Priority (4)

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DE19823234349 DE3234349A1 (en) 1982-09-16 1982-09-16 Heating element for glass-ceramic cooking surfaces
DE3234349 1982-09-16
DE3314501 1983-04-21
DE19833314501 DE3314501A1 (en) 1983-04-21 1983-04-21 Heating element, especially a radiant heating element for heating glass-ceramic plates

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EP0103741A2 true EP0103741A2 (en) 1984-03-28
EP0103741A3 EP0103741A3 (en) 1984-07-25
EP0103741B1 EP0103741B1 (en) 1988-11-17

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EP (1) EP0103741B1 (en)
AU (1) AU1912683A (en)
DE (1) DE3378516D1 (en)
ES (1) ES8406833A1 (en)
GR (1) GR81429B (en)
YU (1) YU44859B (en)

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DE3503648A1 (en) * 1984-09-22 1986-04-03 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen BEAM RADIATOR FOR COOKING APPLIANCES
EP0124778B1 (en) * 1983-04-28 1989-10-04 E.G.O. Elektro-Geräte Blanc u. Fischer Electric cooking plate or hot plate
DE4438648A1 (en) * 1994-10-28 1996-05-02 Ego Elektro Blanc & Fischer Radiant heater
EP0777405A3 (en) * 1995-11-30 1997-12-29 Ceramaspeed Limited Radiant electric heater arrangement and method of operating the same
WO2013186062A1 (en) * 2012-06-13 2013-12-19 Eika, S.Coop. Cooking appliance adapted to a cooktop, particularly a glass ceramic cooktop
EP2983449A1 (en) * 2014-08-08 2016-02-10 BSH Hausgeräte GmbH Method for accelerating a cooking process, control device and cooking device for same
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DE3503648A1 (en) * 1984-09-22 1986-04-03 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen BEAM RADIATOR FOR COOKING APPLIANCES
DE4438648A1 (en) * 1994-10-28 1996-05-02 Ego Elektro Blanc & Fischer Radiant heater
EP0777405A3 (en) * 1995-11-30 1997-12-29 Ceramaspeed Limited Radiant electric heater arrangement and method of operating the same
WO2013186062A1 (en) * 2012-06-13 2013-12-19 Eika, S.Coop. Cooking appliance adapted to a cooktop, particularly a glass ceramic cooktop
EP2983449A1 (en) * 2014-08-08 2016-02-10 BSH Hausgeräte GmbH Method for accelerating a cooking process, control device and cooking device for same
CN108652424A (en) * 2018-06-13 2018-10-16 李金胜 A kind of electric food warmer heating system

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ES525626A0 (en) 1984-07-16
EP0103741B1 (en) 1988-11-17
YU44859B (en) 1991-04-30
DE3378516D1 (en) 1988-12-22
ES8406833A1 (en) 1984-07-16
GR81429B (en) 1984-12-11
AU1912683A (en) 1984-03-22
US4511789A (en) 1985-04-16
YU187483A (en) 1985-12-31
EP0103741A3 (en) 1984-07-25

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