EP0116861A1 - Electric radiant heating element for heating cooking or hot plates, especially glass ceramic plates - Google Patents

Electric radiant heating element for heating cooking or hot plates, especially glass ceramic plates Download PDF

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Publication number
EP0116861A1
EP0116861A1 EP84100541A EP84100541A EP0116861A1 EP 0116861 A1 EP0116861 A1 EP 0116861A1 EP 84100541 A EP84100541 A EP 84100541A EP 84100541 A EP84100541 A EP 84100541A EP 0116861 A1 EP0116861 A1 EP 0116861A1
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EP
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Prior art keywords
temperature sensor
radiant heater
heating
heater according
heating elements
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EP84100541A
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German (de)
French (fr)
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EP0116861B1 (en
EP0116861B2 (en
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Gerhard Gössler
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EGO Elektro Geratebau GmbH
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EGO Elektro Gerate Blanc und Fischer GmbH
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00Details of electric heating devices
    • H05B1/02Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0202Switches
    • H05B1/0216Switches actuated by the expansion of a solid element, e.g. wire or rod
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00Ohmic-resistance heating
    • H05B3/68Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/748Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater

Definitions

  • the invention relates to an electric radiant heater for heating cooking and heating plates, in particular glass ceramic plates, with heating elements arranged at a distance from the plate in a heating zone and a temperature controller with a rod-shaped temperature sensor which projects above the heating zone and extends above the level of the heating elements.
  • Such radiant heaters are known for example from DE-GM 81 03 514 and DE-OS 30 07 037. They usually run around the middle of the entire heating zone, i.e. in the case of a round radiator approximately over the diameter and in the case of elongated radiators diagonally, and are thus exposed to the direct radiation of the radiant heaters, so that they enable very fast and easily responsive regulation for the maximum temperature of the glass ceramic plate.
  • Glass ceramic plates must be regulated very precisely with regard to their surface temperatures, because if they are exceeded, damage will result from the glass ceramic plates becoming brittle.
  • an additional temperature sensor is arranged below the heating elements in a groove. However, it is only intended to indicate the hot state of the plate and switches at temperatures below 370 K (100 ° C).
  • a temperature controller with a rod-shaped temperature sensor is known, which is intended for gas stoves.
  • the rod-shaped temperature sensor is surrounded by a tube made of stainless steel at a certain distance in order to keep the corrosive effects of the gas flame away from the temperature sensor and also to achieve a spatial equalization of the temperature.
  • Limiting the surface temperature of a glass ceramic plate limits its throughput, because the temperature controller must be set so that the maximum level of the surface temperature must not be exceeded even when it is idle or in the case of unfavorable cooking vessels.
  • This object is achieved according to the invention by a temporarily effective thermal shield for the temperature sensor.
  • the temporarily effective shielding which prevents the temperature sensor from reaching the full temperature immediately in the heating or heating phase, enables a higher temperature level to be reached in this heating phase, which is then reduced to a steady state during further operation. It has been found that, in practice, the surface temperatures permitted for continuous operation can be temporarily exceeded without substantial damage to the glass ceramic. This only occurs when the maximum temperatures are exceeded for a long time.
  • the invention can produce a parboil with a peak of about & 80 K (610 ° C) at a permanent limit temperature set to 810 K (540 ° C), which subsides again within a few minutes. A parboil from 50 to 100 K above the permanent limitation temperature is advantageous.
  • a temperature controller When we speak of a temperature controller here, it is in most cases a permanently set temperature monitor, which is particularly advantageously equipped with a rod-shaped temperature sensor, which consists of a quartz sleeve and a metal rod located therein.
  • the term “temperature controller” should also be understood to mean adjustable temperature controllers which have a maximum setting adjusted to a maximum temperature, and sensors of other types, for example with pipes filled with expansion fluid or electrical resistance.
  • the temporary shielding of the temperature sensor can be achieved in different ways. It has been shown to be advantageous that the temperature sensor is at least partially shielded against direct radiation coming from the heating elements. In contrast, it should advantageously be exposed to the radiation coming from the plate, preferably over its entire length.
  • the temperature sensor can be partially surrounded by thermal insulation material, preferably it is in contact with thermal insulation material over part of its circumference and / or its length, preferably in its lower circumferential section. This insulating material is heated up more slowly by the heating elements, so that the temperature sensor heats up with a time delay.
  • the temperature sensor can lie in a channel made of insulating material.
  • This web shields the temperature sensor, which is advantageously embedded up to half of it, against the direct radiation of the heating elements lying laterally below it, but presents it with the projected surface of the plate which is leveled from above, so that it responds particularly well to the heat of reflection.
  • the division of the heating elements into, for example, approximately semicircular heating zones has no significant disadvantages compared to the conventional spiral arrangement and hardly leads to a shadow visible from above in the area of the web.
  • the temperature sensor protrudes over a large part of its length over the heating elements. Shortening or relocating to an edge area is usually out of the question because the temperature sensor should, if possible, sense the entire heating zone in order, for example, to react correctly even when the pan is moved relative to the heating element.
  • the thermal sensitivity of the temperature sensor can advantageously be provided in a part in which thermal shielding is possible, for example in an unheated central area. This part with increased sensitivity then experiences a time delay, which affects the entire control behavior accordingly. Nevertheless, the influence of the other controller sections remains, albeit to a lesser extent.
  • the temperature sensor in particular its outer shell, consists of a material with low thermal conductivity. This not only promotes the effect in the case of response sensitivities which differ over the longitudinal direction, but also prevents temperature compensation around the circumference of the temperature sensor, which could have a negative effect on the delay in the response of the controller.
  • the radiant heater 11 shown in Figures 1 and 2 is arranged below a glass ceramic plate 12, the surface 13 of which forms a cooking surface.
  • the radiant heater 11 has a carrier shell 14 made of sheet metal, into which insulation is inserted.
  • the insulation is two-layered, the bottom layer 15 made of a very good thermal insulation material without mechanical strength requirements, while the upper insulation 16 consists of a mechanically somewhat stronger material, because its edge 17 by not shown, on the carrier shell 14 acting spring elements is pressed onto the glass ceramic plate and heating elements 18 and a temperature sensor 20 are arranged on it.
  • the thermal insulating material, in particular for the upper insulating body 16, consists of a ceramic fiber, preferably of aluminum silicate, which is pressed in order to achieve sufficient strength. Such material is offered under the trade name "Fiberfrax".
  • the insulating body 16 has a shell shape surrounded by the edge 17 ′ with a cavity 19, on the bottom of which the Heating elements 18 are arranged so that they form a substantially circular heating zone 21, which however consists of two semicircular sections 22, 23.
  • the heating elements 18 are filaments made of electrical resistance wire, which are guided essentially parallel to one another and thus form two semicircles which essentially fill the surface uniformly and which change from one section to the other at a transition point 24.
  • the heating elements 18 are at a substantial distance from the glass ceramic plate. Between the sections 22, 23, a web 25 of the insulating body 16 protrudes longitudinally on a diameter line, which rises considerably above the level of the heating elements and thus lies much closer to the glass ceramic plate 12 than this. 2, which can be seen in particular from FIG.
  • the temperature controller 30 is turned on with the S contained in it ch n pp- a switch 31 in the circuit of the heating resistor formed as a continuous in this case, heating elements and controls it by switching on and off.
  • the temperature Controller consists of an expansion sleeve 33 made of quartz material and an expansion rod 43 located therein, attached to the sleeve at the end of the temperature sensor, with a larger coefficient of thermal expansion than the sleeve.
  • the heating elements heat up relatively quickly and heat the underside of the glass ceramic plate by radiation, which on the one hand transmits this through its radiation permeability and on the other hand through heat conduction to a cooking vessel (not shown) placed on it.
  • the temperature sensor is not heated up as quickly as the surface of the glass ceramic plate, so that its expansion remains somewhat behind when the temperature rises to the glass ceramic plate. This is due on the one hand to the fact that the temperature sensor is shielded from direct radiation, and on the other hand to its close proximity to the insulating material of the web 25, which only heats up after a long period of time.
  • the temperature sensor is largely heated by the reflection from the glass ceramic plate, the delay effect being increased by a cold cooking vessel placed on it.
  • the delay also occurs when the plate is idling without a cooking vessel.
  • the heating elements are only switched off for the first time at a temperature which is on the surface 13 of the glass ceramic plate 12 somewhat above the temperature for which the controller itself is adjusted.
  • Tem e p - temperature After the decrease in the Tem e p - temperature it therefore also switched sooner than in the steady state again, so that there is istaus a zigzag line existing curve which drops the manner of a Exponetialkurve and after some time in the order of between 10 and 30 minutes completely changes into a horizontal zigzag band, if you plot the temperature over time.
  • the heating element 18a is in this case wound as a double spiral, i.e. as a spiral consisting of two resistance wire coils running parallel to one another, leaving an unheated zone 32 open in the middle, the diameter of which corresponds to about a quarter to a third of the diameter of the entire heating zone 21a.
  • the temperature sensor 20a of the temperature controller 30a therefore protrudes in the area of the annular heating zone over the heating elements 18a, but lies in the area of the unheated middle zone 32 on a web 25a which, with the exception of its length, is of the same design as in FIGS. 1 and 2. Only in In this area there is a temporary thermal shield.
  • the thermal sensitivity of the temperature sensor is increased in this area by the expansion rod 43 in this area consisting of a material with a higher thermal expansion coefficient than in the other areas of the temperature sensor 20a.

Abstract

1. Electric radiant heater for heating cooking or hotplates (12), particularly glass ceramic plates, with heating elements (18, 18a) arranged in a heating zone (21) at a distance from plate (12) and a temperature regulator (30, 30a) with a rod-like temperature sensor (20, 20a) projecting over the heating zone (21) and passing above the plane of heating elements (18) and which is at least partly shielded against the direct radiation from heating elements (18, 18a) by an insulating material web (25) on which it is arranged, characterized in that the temperature sensor (20, 20a) provided with a temporarily acting thermal shielding is spaced from plate (12) and is exposed to the radiation from plate (12) essentially over its entire length.

Description

Die Erfindung betrifft einen elektrischen Strahlheizkörper zur Beheizung von Koch- und Wärmeplatten, insbesondere Glaskeramikplatten, mit im Abstand von der Platte in einer Heizzone angeordneten Heizelementen und einem Temperaturregler mit einem stabförmigen, über die Heizzone ragenden, oberhalb der Ebene der Heizelemente verlaufenden Temperaturfühler.The invention relates to an electric radiant heater for heating cooking and heating plates, in particular glass ceramic plates, with heating elements arranged at a distance from the plate in a heating zone and a temperature controller with a rod-shaped temperature sensor which projects above the heating zone and extends above the level of the heating elements.

Derartige Strahlheizkörper sind beispielsweise aus dem DE-GM 81 03 514 und der DE-OS 30 07 037 bekannt geworden. Sie verlaufen üblicherweise etwa mittig über die gesamte Heizzone hinweg, d.h. bei einem runden Heizkörper etwa über den Durchmesser und bei langgestreckten Heizkörpern diagonal, und sind so der unmittelbaren Strahlung der Strahlheizkörper ausgesetzt, so daß sie eine sehr schnelle und leicht ansprechende Regelung für die maximale Temperatur der Glaskeramikplatte ermöglichen.Such radiant heaters are known for example from DE-GM 81 03 514 and DE-OS 30 07 037. They usually run around the middle of the entire heating zone, i.e. in the case of a round radiator approximately over the diameter and in the case of elongated radiators diagonally, and are thus exposed to the direct radiation of the radiant heaters, so that they enable very fast and easily responsive regulation for the maximum temperature of the glass ceramic plate.

Glaskeramikplatten müssen bezüglich ihrer Oberflächentemperaturen sehr genau geregelt werden, weil deren Oberschreitung zu einer Schädigung durch Brüchigwerden der Glaskeramikplatten führt.Glass ceramic plates must be regulated very precisely with regard to their surface temperatures, because if they are exceeded, damage will result from the glass ceramic plates becoming brittle.

Bei dem DE-GM 81 03 514 ist ein zusätzlicher Temperaturfühler unterhalb der Heizelemente in einer Nut angeordnet. Er ist jedoch nur zur Anzeige des Heißzustandes der Platte vorgesehen und schaltet bereits bei Temperaturen von unter 370 K (100°C).In DE-GM 81 03 514, an additional temperature sensor is arranged below the heating elements in a groove. However, it is only intended to indicate the hot state of the plate and switches at temperatures below 370 K (100 ° C).

Aus der DE-PS 27 29 929 ist bekannt geworden, bei einem Strahlheizkörper den Temperaturfühler in einer öffnung im Isoliermaterial unterhalb der Ebene der Heizelemente verlaufend anzuordnen. Es hat sich jedoch gezeigt, daß hier der Temperaturfühler zu weit von dem Verbrauch entkoppelt ist, d.h. der Temperaturregler schaltet die Beheizung nicht ein, wenn nach vorhergehendem Leerlauf ein Topf aufgesetzt wird und dementsprechend mehr Leistung benötigt wird. Diese Anordnung ist daher'in der Praxis wieder verlassen worden.From DE-PS 27 29 929 it has become known to arrange the temperature sensor in a radiant heater in an opening in the insulating material below the level of the heating elements. However, it has been shown that the temperature sensor is decoupled too far from the consumption, i.e. the temperature controller does not switch on the heating if a pot is placed after a previous idle and accordingly more power is required. This arrangement has therefore been abandoned in practice.

Ferner ist aus dem DE-GM 78 26 549 ein Temperaturregler mit stabförmigem Temperaturfühler bekannt geworden, der für Gasherde gedacht ist. Dabei ist der stabförmige Temperaturfühler von einem Rohr aus rostfreiem Stahl mit einigem Abstand umgeben, um die korrosiven Wirkungen der Gasflamme vom Temperaturfühler fernzuhalten und außerdem eine räumliche Vergleichmäßigung der Temperatur zu erreichen.Furthermore, from DE-GM 78 26 549 a temperature controller with a rod-shaped temperature sensor is known, which is intended for gas stoves. The rod-shaped temperature sensor is surrounded by a tube made of stainless steel at a certain distance in order to keep the corrosive effects of the gas flame away from the temperature sensor and also to achieve a spatial equalization of the temperature.

Durch die Begrenzung der Oberflächentemperatur einer Glaskeramikplatte ist ihr Leistungsdurchsatz begrenzt, weil der Temperaturregler so eingestellt sein muß, daß auch im Leerlaufzustand bzw. bei ungünstigen Kochgefäßen das Maximalniveau der Oberflächentemperatur nicht überschritten werden darf.Limiting the surface temperature of a glass ceramic plate limits its throughput, because the temperature controller must be set so that the maximum level of the surface temperature must not be exceeded even when it is idle or in the case of unfavorable cooking vessels.

Diese Aufgabe wird gemäß der Erfindung gelöst durch eine temporär wirksame thermische Abschirmung für den Temperaturfühler.This object is achieved according to the invention by a temporarily effective thermal shield for the temperature sensor.

Die temporär wirksame Abschirmung, die also in der Anheiz- bzw. Ankochphase den Temperaturfühler daran hindert, sofort auf volle Temperatur zu kommen, ermöglicht es, in dieser Ankochphase ein höheres Temperaturniveau zu erreichen, das dann jedoch beim weiteren Betrieb auf einen Beharrungszustand abgesenkt wird. Es ist festgestellt worden, daß man in der Praxis ohne wesentliche Schädigung der Glaskeramik die für den Dauerbetrieb zulässigen Oberflächentemperaturen temporär überschreiten kann. Diese tritt erst bei länger andauernden Überschreitungen der Maximaltemperaturen ein. So kann beispielsweise durch die Erfindung bei einer auf 810 K (540°C) eingestellten Dauerbegrenzungstemperatur ein Ankochstoß mit einer Spitze von etwa &80 K (610°C) erzeugt werden, der innerhalb einiger Minuten wieder abklingt. Eine Ankochspitze von 50 bis 100 K über der Dauerbegrenzungstemperatur ist vorteilhaft. Er könnte so abklingen, daß er in einer Zeit von zwei bis fünf Minuten nach dem Erreichen der Spitzentemperatur etwa die Hälfte des über die Dauertemperatur überschießenden Temperaturbetrages erreicht hat, während er nach einer Zeit von etwa zehn bis fünfzehn Minuten asymptotisch in die Dauerbegrenzungstemperatur übergeht. Dabei ist zu beachten, daß ; die Regelschwingungen des meist durch Ein- und Ausschalten regelnden Temperaturreglers diese Kurve überlagern, so daß sie einen sägezahnartigen Verlauf hat. Die dadurch mögliche Temperaturspitze im Ankochbereich führt zu einem wesentlich erhöhten Leistungsdurchsatz, weil dieser in der vierten Potenz von der Temperatur abhängt. ; The temporarily effective shielding, which prevents the temperature sensor from reaching the full temperature immediately in the heating or heating phase, enables a higher temperature level to be reached in this heating phase, which is then reduced to a steady state during further operation. It has been found that, in practice, the surface temperatures permitted for continuous operation can be temporarily exceeded without substantial damage to the glass ceramic. This only occurs when the maximum temperatures are exceeded for a long time. For example, the invention can produce a parboil with a peak of about & 80 K (610 ° C) at a permanent limit temperature set to 810 K (540 ° C), which subsides again within a few minutes. A parboil from 50 to 100 K above the permanent limitation temperature is advantageous. It could decay so that within two to five minutes after the peak temperature had been reached it would have reached about half the temperature that exceeded the permanent temperature, while after about ten to fifteen minutes it would asymptotically switch to the permanent limit temperature. It should be noted that; the control oscillations of the temperature controller, which is usually controlled by switching on and off, overlap this curve so that it has a sawtooth-like course. The possible temperature peak in the parboil area leads to a significantly increased power throughput, because the fourth power depends on the temperature. ;

In den meisten Fällen bringt dies schon bei der üblichen Leistungsausstattung der Strahlheizkörper eine wesentliche Verkürzung der Ankochzeit, weil bisher wegen der Glaskeramik-Oberflächentemperaturen die an sich vorhandene Leistung bereits frühzeitig abgeregelt werden mußte. Es ist jedoch nun auch möglich, höhere Leistungen vorzusehen, so daß auch die reine Aufheizungszeit bis zum Erreichen der Maximaltemperatur noch kürzer wird.In most cases, this already leads to a significant reduction in the boil-up time with the usual power equipment of the radiant heaters, because previously the output per se had to be curtailed early due to the glass ceramic surface temperatures. However, it is now also possible to provide higher outputs, so that the heating-up time is even shorter until the maximum temperature is reached.

Wenn hier von einen Temperaturregler gesprochen wird, so handelt es sich in den meisten Fällen um einen fest eingestellten Temperaturwächter, der besonders vorteilhaft mit einem stabförmigen Temperaturfühler ausgerüstet ist, der aus einer Quarzguthülse und einem darin liegenden Metallstab besteht. Unter dem Begriff "Temperaturregler" sollen in diesem Zusammenhang aber auch einstellbare Temperaturregler verstanden werden, die eine auf eine Maximaltemperatur einjustierte Maximaleinstellung haben, und um Regler anderer Bauarten, beispielsweise mit durch Ausdehnungsflüssigkeit gefüllten Rohren oder elektrischen Widerstand - fühlern. Die temporär wirkende thermische Abschirmung des Temperaturfühlers kann auf verschiedene Weise erreicht werden. Als vorteilhaft hat sich gezeigt, daß der Temperaturfühler zumindest teilweise gegen von den Heizelementen kommende direkte Strahlung abgeschirmt ist. Dagegen sollte er vorteilhaft der von der Platte her kommenden Strahlung vorzugsweise über seine ganze Länge ausgesetzt sein. Auf diese Weise wird zwar der Einfluß der schnell ihrer Temperatur erreichenden Heizelemente verzögert, die gute Ankopplung an die Platte und ihre Rückwirkung auf den Fühler wird jedoch beibehalten, so daß die Regelcharakteristik, insbesondere die Regelamplitude, nicht negativ beeinflußt wird. Der Temperaturfühler kann teilweise von thermischem Isoliermaterial umgeben sein, vorzugsweise ist er über einen Teil seines Umfanges und/ oder seiner Länge, vorzugsweise in seinem unteren Umfangsabschnitt, in Kontakt mit thermischem Isoliermaterial. Dieses Isoliermaterial wird von den Heizelementen langsamer aufgeheizt, so daß dadurch eine zeitlich verzögerte Aufheizung des Temperaturfühlers erfolgt. Der Temperaturfühler kann dazu in einer Rinne aus Isoliermaterial liegen. Vorzugsweise liegt er im Bereich eines in seiner Längsrichtung verlaufenden Steges, den vorzugsweise über die Ebene der Heizelemente hochragt und besonders bevorzugt zwei gesonderte Abschnitte der Heizzone voneinander zumindest teilweise trennt. Dieser Steg schirmt den vorteilhaft etwa bis zur Hälfte in ihn eingebetteten Temperaturfühler gegen die direkte Strahlung der seitlich unterhalb von ihm liegenden Heizelemente ab, präsentiert ihn aber mit der von oben gesebenen projezierten Fläche der Platte, so daß er auf die Rückstrahlungswärme besonders gut anspricht. Die Aufteilung der Heizelemente in zwei beispielsweise etwa halbkreisförmige Heizzonen hat gegenüber der üblichen spiralförmigen Anordnung keine wesentlichen Nachteile und führt auch kaum zu einem von oben merklichen Schatten im Bereich des Steges.When we speak of a temperature controller here, it is in most cases a permanently set temperature monitor, which is particularly advantageously equipped with a rod-shaped temperature sensor, which consists of a quartz sleeve and a metal rod located therein. In this context, however, the term “temperature controller” should also be understood to mean adjustable temperature controllers which have a maximum setting adjusted to a maximum temperature, and sensors of other types, for example with pipes filled with expansion fluid or electrical resistance. The temporary shielding of the temperature sensor can be achieved in different ways. It has been shown to be advantageous that the temperature sensor is at least partially shielded against direct radiation coming from the heating elements. In contrast, it should advantageously be exposed to the radiation coming from the plate, preferably over its entire length. In this way, although the influence of the heating elements quickly reaching their temperature is delayed, the good coupling to the plate and its reaction on the sensor is retained, so that the control characteristic, in particular the control amplitude, is not adversely affected. The temperature sensor can be partially surrounded by thermal insulation material, preferably it is in contact with thermal insulation material over part of its circumference and / or its length, preferably in its lower circumferential section. This insulating material is heated up more slowly by the heating elements, so that the temperature sensor heats up with a time delay. For this purpose, the temperature sensor can lie in a channel made of insulating material. It is preferably located in the region of a web running in its longitudinal direction, which preferably projects above the level of the heating elements and particularly preferably at least partially separates two separate sections of the heating zone. This web shields the temperature sensor, which is advantageously embedded up to half of it, against the direct radiation of the heating elements lying laterally below it, but presents it with the projected surface of the plate which is leveled from above, so that it responds particularly well to the heat of reflection. The division of the heating elements into, for example, approximately semicircular heating zones has no significant disadvantages compared to the conventional spiral arrangement and hardly leads to a shadow visible from above in the area of the web.

Insbesondere in Fällen, in denen sich eine Trennung der Heizzone nicht anbietet, ragt der Temperaturfühler über einen großen Teil seiner Länge über die Heizelemente hinweg. Eine Verkürzung oder Verlegung in einen Randbereich kommt meist nicht infrage, weil der Temperaturfühler möglichst die ganze Heizzone abfühlen soll, um beispielsweise auch bei gegenüber dem Heizelement verschobenem Topf noch richtig zu reagieren. In diesem Falle kann vorteilhaft die thermische Ansprechempfindlichkeit des Temperaturfühlers in einem Teil vorgesehen sein, in dem eine thermische Abschirmung möglich ist, beispielsweise in einem unbeheizten Mittelbereich. Dieser Teil mit erhöhter Ansprechempfindlichkeit erfährt dann eine zeitliche Verzögerung, die sich auf das gesamte Regelverhalten entsprechend auswirkt. Trotzdem bleibt der Einfluß der übrigen Reglerabschnitte, wenn auch in geringerem Maße, erhalten. Dies kann beispielsweise durch die Verwendung von Materialien mit über die Länge unterschiedlichem Ausdehnungskoeffizienten bei einem Stab-Ausdehnungsfühler geschehen, wobei im Bereich hoher Ansprechempfindlichkeit entweder das Teil mit insgesamt höherer Ausdehnung einen gegenüber den übrigen Bereichen erhöhten Ausdehnungskoeffizienten hat oder das Teil mit geringerer Ausdehnung mit einen Abschnitt mit besonders geringem Ausdehnungskoeffizienten. Wenn mit einem mit Ausdehnungsflüssigkeit gefüllten Temperaturfühler gearbeitet wird, könnte an der abgeschirmten Stelle ein größeres Volumen pro Längeneinheit verwendet werden oder ein besonderer, an den gleichen Regler angeschlossener Fühler eingefügt werden.Especially in cases where the heating zone cannot be separated, the temperature sensor protrudes over a large part of its length over the heating elements. Shortening or relocating to an edge area is usually out of the question because the temperature sensor should, if possible, sense the entire heating zone in order, for example, to react correctly even when the pan is moved relative to the heating element. In this case, the thermal sensitivity of the temperature sensor can advantageously be provided in a part in which thermal shielding is possible, for example in an unheated central area. This part with increased sensitivity then experiences a time delay, which affects the entire control behavior accordingly. Nevertheless, the influence of the other controller sections remains, albeit to a lesser extent. This can be done, for example, by using materials with expansion coefficients that differ over their length in a rod expansion sensor, whereby in the area of high sensitivity, either the part with an overall higher expansion has an expansion coefficient that is higher than the other areas or the part with less expansion with one section with a particularly low expansion coefficient. If you are working with a temperature sensor filled with expansion fluid, a larger volume per unit length could be used at the shielded point or a special sensor connected to the same controller could be inserted.

In jedem Falle ist es zweckmäßig, wenn der Temperaturfühler, insbesondere seine Außenhülle, aus einem Material mit geringer Wärmeleitfähigkeit besteht. Dies fördert nicht nur die Wirkung bei über die Längsrichtung unterschiedlichen Ansprechempfindlichkeiten, sondern verhindert auch einen Temperaturausgleich um den Umfang des Temperaturfühlers herum, der sich für die zeitliche Verzögerung des Ansprechens des Reglers negativ auswirken könnte.In any case, it is expedient if the temperature sensor, in particular its outer shell, consists of a material with low thermal conductivity. This not only promotes the effect in the case of response sensitivities which differ over the longitudinal direction, but also prevents temperature compensation around the circumference of the temperature sensor, which could have a negative effect on the delay in the response of the controller.

Merkmale von bevorzugten Weiterbildungen der Erfindung gehen aus den Unteransprüchen und der Beschreibung im Zusammenhang mit den Zeichnungen hervor, wobei die einzelnen Merkmale jeweils für sich allein oder zu mehreren in Form von Unterkombinationen bei einer Ausführungsform der Erfindung verwirklicht sein können. Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher erläutert. Es zeigen:

  • Fig. 1 eine Draufsicht auf einen elektrischen Strahlheizkörper,
  • Fig. 2 einen Schnitt nach der Linie II in Fig. 1,
  • Fig. 3 eine Draufsicht auf eine weitere Ausführungsform und
  • Fig. 4 einen Teilschnitt nach der Linie IV in Fig. 3.
Features of preferred developments of the invention emerge from the subclaims and the description in connection with the drawings, the individual features each individually or in groups can be realized in the form of sub-combinations in one embodiment of the invention. Embodiments of the invention are shown in the drawing and are explained in more detail below. Show it:
  • 1 is a plan view of an electric radiant heater,
  • 2 shows a section along the line II in FIG. 1,
  • Fig. 3 is a plan view of a further embodiment and
  • 4 shows a partial section along line IV in FIG. 3.

Der in den Figuren 1 und 2 dargestellte Strahlheizkörper 11 istunterhalb einer Glaskeramikplatte 12 angeordnet, deren Oberfläche 13 eine Kochfläche bildet.The radiant heater 11 shown in Figures 1 and 2 is arranged below a glass ceramic plate 12, the surface 13 of which forms a cooking surface.

Der Strahlheizkörper 11 besitzt eine aus Blech bestehende Trägerschale 14, in die eine Isolierung eingelegt ist. Die Isolierung ist zweischichtig, wobei die unterste Schicht 15 aus einem sehr gut thermisch isolierenden Material ohne Ansprüche an die mechanische Festigkeit bestehen kann, während die obere Isolierung 16 aus einem mechanisch etwas festeren Material besteht, weil ihr Rand 17 durch nicht dargestellte, auf die Trägerschale 14 einwirkende Federelemente an die Glaskeramikplatte angedrückt wird und Heizelemente 18 sowie ein Temperaturfühler 20 auf ihr angeordnet sind. Das thermische Isoliermaterial, insbesondere für den oberen Isolierkörper 16, besteht aus einer keramischen Faser, vorzugsweise aus Aluminiumsilikat, die zur Erzielung ausreichender Festigkeit verpreßt ist. Derartiges Material wird unter dem Handelsnamen "Fiberfrax" angeboten.The radiant heater 11 has a carrier shell 14 made of sheet metal, into which insulation is inserted. The insulation is two-layered, the bottom layer 15 made of a very good thermal insulation material without mechanical strength requirements, while the upper insulation 16 consists of a mechanically somewhat stronger material, because its edge 17 by not shown, on the carrier shell 14 acting spring elements is pressed onto the glass ceramic plate and heating elements 18 and a temperature sensor 20 are arranged on it. The thermal insulating material, in particular for the upper insulating body 16, consists of a ceramic fiber, preferably of aluminum silicate, which is pressed in order to achieve sufficient strength. Such material is offered under the trade name "Fiberfrax".

Der Isolierkörper 16 hat eine von dem Rand 17'umgebene Schalenform mit einem Hohlraum 19, an dessen Boden die Heizelemente 18 so angeordnet sind, daß sie eine im wesentlichen kreisförmige Heizzone 21 bilden, die jedoch aus zwei halbkreisförmigen Abschnitten 22, 23 besteht. Die Heizelemente 18 sind Wendeln aus elektrischem Widerstandsdraht, die im wesentlichen parallel zueinander geführt sind und so zwei im wesentlichen die Fläche gleichmäßig ausfüllende Halbkreise bilden, die an einer Obergangsstelle 24 von einem Abschnitt zum anderen überwechseln. Die Heizelemente 18 haben einen wesentlichen Abstand von der Glaskeramikplatte. Zwisc-hen den Abschnitten 22, 23 ragt längs auf einer Durchmesserlinie ein Steg 25 des Isolierkörpers 16 hindurch, der sich erheblich über die Ebene der Heizelemente erhebt und somit wesentlich dichter an der Glaskeramikplatte 12 liegt als diese. Der insbesondere aus Fig. 2 zu erkennende, im wesentlichen rechtwinklig begrenzte Steg 25 hat in seiner Oberseite eine halbkreisförmige Rinne 26, in der der-Temperaturfühler 20 liegt. Er ist also etwa zur Hälfte seines Umfangs in das Isoliermaterial eingebettet, und die seitlich vorspringenden Kanten 27 des Steges decken den Temperaturfühler gegen von den nächstliegenden Heizelementen kommende Strahlung weitgehend ab. Der Temperaturfühler ragt in einer Durchmesserlinie über den gesamten kreisförmigen Strahlungsheizkörper hinweg, und der zugehörige Schalterkopf 28 des Temperaturreglers 30 liegt außerhalb der Trägerschale 14, in die ein Anschlußstück 29 mit den elektrischen Anschlüssen für die Heizelemente eingefügt ist. Der Temperaturregler ist mit dem in ihm enthaltenen Schnapp- schalter 31 in den Stromkreis der in diesem Falle als ein durchgehender Heizwiderstand ausgebildeten Heizelemente eingeschaltet und regelt diese durch Ein- und Ausschalten. Es handelt sich um einen fest auf eine Begrenzungstemperatur einregulierten Temperaturregler, der auch als Temperatur wächter bezeichnet werden könnte. Der Temperaturfühler besteht aus einer Ausdehnungshülse 33 aus Quarzgut und einer darin liegenden, am Ende des Temperaturfühlers an der Hülse befestigten Ausdehnungsstab 43 mit größerem thermischen Ausdehnungskoeffizienten als die Hülse.The insulating body 16 has a shell shape surrounded by the edge 17 ′ with a cavity 19, on the bottom of which the Heating elements 18 are arranged so that they form a substantially circular heating zone 21, which however consists of two semicircular sections 22, 23. The heating elements 18 are filaments made of electrical resistance wire, which are guided essentially parallel to one another and thus form two semicircles which essentially fill the surface uniformly and which change from one section to the other at a transition point 24. The heating elements 18 are at a substantial distance from the glass ceramic plate. Between the sections 22, 23, a web 25 of the insulating body 16 protrudes longitudinally on a diameter line, which rises considerably above the level of the heating elements and thus lies much closer to the glass ceramic plate 12 than this. 2, which can be seen in particular from FIG. 2 and is essentially at right angles, has a semicircular groove 26 in its upper side, in which the temperature sensor 20 is located. It is thus embedded in the insulating material about half of its circumference, and the laterally projecting edges 27 of the web largely cover the temperature sensor against radiation coming from the closest heating elements. The temperature sensor protrudes in a diameter line over the entire circular radiant heater, and the associated switch head 28 of the temperature controller 30 lies outside the carrier shell 14, into which a connector 29 with the electrical connections for the heating elements is inserted. The temperature controller is turned on with the S contained in it ch n pp- a switch 31 in the circuit of the heating resistor formed as a continuous in this case, heating elements and controls it by switching on and off. It is a temperature controller that is permanently adjusted to a limiting temperature, which could also be referred to as a temperature monitor. The temperature Sensor consists of an expansion sleeve 33 made of quartz material and an expansion rod 43 located therein, attached to the sleeve at the end of the temperature sensor, with a larger coefficient of thermal expansion than the sleeve.

Beim Einschalten des Strahlungsheizkörpers kommen die Heizelemente relativ schnell auf Temperatur und beheizen durch Strahlung die Unterseite der Glaskeramikplatte, die dies einerseits durch ihre Strahlungsdurchlässigkeit und andererseits durch Wärmeleitung an ein darauf gestelltes, nicht dargestelltes Kochgefäß weitergibt. Dabei wird anfänglich der Temperaturfühler infolge seiner Abschirmung nicht so schnell aufgeheizt wie die Oberfläche der Glaskeramikplatte, so daß seine Ausdehnung hinter dem Hochlaufen der Temperaturan dieGlaskeramikplatte etwas zurückbleibt. Dies liegt einerseits daran, daß der Temperaturfühler gegen die direkte Strahlung abgeschirmt ist, andererseits an seiner engen Nachbarschaft mit dem Isoliermaterial des Steges 25, das sich erst nach längerer Zeit aufheizt. Zu Anfang wird also der Temperaturfühler weit-gehend von der Rückstrahlung von der Glaskeramikplatte her beheizt, wobei die Verzögerungswirkung durch ein darauf gestelltes kaltes Kochgefäß noch erhöht wird. Es ist aber festgestellt worden, daß die Verzögerung auch beim Leerlauf der Platte ohne Kochgefäß eintritt. Dadurch erfolgt die erste Abschaltung der Heizelemente erst bei einer Temperatur, die an der Oberfläche 13 der Glaskeramikplatte 12 um einiges über der Temperatur liegt, für die der Regler an sich einjustiert ist. Nach dem Absinken der Tempe- ratur schaltet er daher auch schon früher als im Beharrungszustand wieder ein, so daß sich eineaus einer zickzackförmigen Linie bestehenden Kurve ergibt, die nach Art einer Exponetialkurve abfällt und nach einiger Zeit in der Größenordnung zwischen 10 und 30 Minuten gänzlich in ein horizontal verlaufendes zickzackförmiges Band übergeht, wenn man die Temperatur über der Zeit aufträgt.When the radiant heater is switched on, the heating elements heat up relatively quickly and heat the underside of the glass ceramic plate by radiation, which on the one hand transmits this through its radiation permeability and on the other hand through heat conduction to a cooking vessel (not shown) placed on it. Initially, due to its shielding, the temperature sensor is not heated up as quickly as the surface of the glass ceramic plate, so that its expansion remains somewhat behind when the temperature rises to the glass ceramic plate. This is due on the one hand to the fact that the temperature sensor is shielded from direct radiation, and on the other hand to its close proximity to the insulating material of the web 25, which only heats up after a long period of time. In the beginning, the temperature sensor is largely heated by the reflection from the glass ceramic plate, the delay effect being increased by a cold cooking vessel placed on it. However, it has been found that the delay also occurs when the plate is idling without a cooking vessel. As a result, the heating elements are only switched off for the first time at a temperature which is on the surface 13 of the glass ceramic plate 12 somewhat above the temperature for which the controller itself is adjusted. After the decrease in the Tem e p - temperature it therefore also switched sooner than in the steady state again, so that there is eineaus a zigzag line existing curve which drops the manner of a Exponetialkurve and after some time in the order of between 10 and 30 minutes completely changes into a horizontal zigzag band, if you plot the temperature over time.

Es ist also zu erkennen, daß eine Ankochspitze erzeugt wird, die über eine Zeit in der Größenordnung zwischen 5 und 10 Minuten eine wesentliche Erhöhung des Leistungsdurchsatzes in der Glaskeramikplatte mit sich bringt. Für derartige kurze Zeiten kann Glaskeramik Oberhitzungen in der Größenordnung unter 100 K so oft ertragen, daß trotzdem eine ausreichende Lebensdauer gewährleistet ist.It can thus be seen that a parboiler tip is produced which brings about a substantial increase in the power throughput in the glass ceramic plate over a period of the order of 5 to 10 minutes. For such short times, glass ceramics can withstand overheating in the order of magnitude below 100 K so often that an adequate service life is nevertheless guaranteed.

Bei der Ausführungsform nach Fig. 3 und 4 tragen gleiche Teile gleiche Bezugszeichen, die bei ähnlichen Teilen durch den Index "a" ergänzt sind. Wegen ihrer Beschreibung im einzelnen wird auf das Vorstehende Bezug genommen.In the embodiment according to FIGS. 3 and 4, the same parts have the same reference numerals, which are supplemented by the index "a" for similar parts. For the detailed description thereof, reference is made to the above.

Das Heizelement 18a ist in diesem Falle als Doppelspirale gewickelt, d.h. als Spirale aus zwei zueinander parallel laufenden Widerstandsdrahtwendeln, die in der Mitte eine unbeheizte Zone 32 freilassen, deren Durchmesser etwa einem Viertel bis einem Drittel des Durchmessers der gesamten Heizzone 21a entspricht. Der Temperaturfühler 20a des Temperaturreglers 30a ragt demnach im Bereich der ringförmigen Beheizungszone über die Heizelemente 18a hinweg, liegt jedoch im Bereich der unbeheizten Mittelzone 32 auf einem Steg 25a, der mit Ausnahme seiner Länge gleich ausgebildet ist wie in Fig. 1 und 2. Nur in diesem Bereich findet also eine temporäre thermische Abschirmung statt. Um diesen Bereich mit seiner thermischen Verzögerung jedoch für das Regelergebnis stärker zur Auswirkung zu bringen, ist in diesem Bereich die thermische Ansprechempfindlichkeit des Temperaturfühlers erhöht, indem der Ausdehnungsstab 43 in diesem Bereich aus einem Material mit höherem thermischem Ausdehnungskoeffizienten besteht als in den übrigen Bereichen des Temperaturfühlers 20a.The heating element 18a is in this case wound as a double spiral, i.e. as a spiral consisting of two resistance wire coils running parallel to one another, leaving an unheated zone 32 open in the middle, the diameter of which corresponds to about a quarter to a third of the diameter of the entire heating zone 21a. The temperature sensor 20a of the temperature controller 30a therefore protrudes in the area of the annular heating zone over the heating elements 18a, but lies in the area of the unheated middle zone 32 on a web 25a which, with the exception of its length, is of the same design as in FIGS. 1 and 2. Only in In this area there is a temporary thermal shield. However, in order to make this area with its thermal delay more effective for the control result, the thermal sensitivity of the temperature sensor is increased in this area by the expansion rod 43 in this area consisting of a material with a higher thermal expansion coefficient than in the other areas of the temperature sensor 20a.

Das kann beispielsweise durch das Einschweißen eines Stab stücks aus einem Material mit anderem thermischem Ausdehnungskoeffizienten erfolgen. Derartiges Material ist im Handel erhältlich, und es könnte beispielsweise eine Kombination von Materialien verwendet werden, die von der Firma Vacuumschmelze GmbH, Hanau, unter dem Handelsnamen "Vacodil" vertrieben wird, wobei Vacodil 74 eine spezifische thermische Ausdehnung von 31 x 10-6 / K hat, während dieser Faktor bei Vacodil 36 bei 9,2 x 10-6 /K liegt. Auf diese Weise wird der Einfluß dieser längenmäßig ; relativ geringen Zone überbetont, und es ist festgestellt worden, daß dies auf das übrige Regelverhalten keinen nachteiligen Einfluß hat. Vor allem ist bei allen Ausführungsformen zu bemerken, daß der Regler durch die temporäre Abschirmung im späteren stationären Zustand keinesfalls träger und mit größerer Regelamplitude arbeitet als bisherige Regler ohne Anwendung der Erfindung.This can be done, for example, by welding a piece of rod made of a material with a different coefficient of thermal expansion. Such material is commercially available and, for example, a combination of materials sold by Vacuumschmelze GmbH, Hanau, under the trade name "Vacodil" could be used, where Vacodil 74 has a specific thermal expansion of 31 x 10 -6 / K has, while with Vacodil 36 this factor is 9.2 x 10- 6 / K. In this way, the influence of this becomes elongated; relatively small zone overemphasized, and it has been found that this has no adverse effect on the rest of the control behavior. Above all, it should be noted in all embodiments that the controller does not act sluggishly and with a greater control amplitude than previous controllers without application of the invention due to the temporary shielding in the later stationary state.

Claims (10)

1. Elektrischer Strahlheizkörper zur Beheizung von Koch-oder Wärmeplatten (12), insbesondere Glaskeramikplatten, mit in Abstand von der Platte (12) in einer Heizzone (21) angeordneten Heizelementen (18, 18a) und einem Temperaturregler (30, 30a) mit einem stabförmigen, über die Heizzone (21) ragenden, oberhalb der Ebene der Heizelemente (18) verlaufenden Temperaturfühler (20, 20a), gekennzeichnet durch eine temporär wirksame thermische Abschirmung für den Temperaturfühler (20, 20a).1. Electric radiant heater for heating cooking or heating plates (12), in particular glass ceramic plates, with heating elements (18, 18a) arranged at a distance from the plate (12) in a heating zone (21) and a temperature controller (30, 30a) with a Rod-shaped temperature sensors (20, 20a) projecting above the heating zone (21) and running above the level of the heating elements (18), characterized by a temporarily effective thermal shield for the temperature sensor (20, 20a). 2. Strahlheizkörper nach Anspruch 1, dadurch gekennzeichnet, daß der Temperaturfühler (20, 20a) vorzugsweise weitgehend mittig über die gesamte Heizzone (21) ragt.2. Radiant heater according to claim 1, characterized in that the temperature sensor (20, 20a) preferably extends largely centrally over the entire heating zone (21). 3. Strahlheizkörper nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Temperaturfühler (20, 20a) zumindest teilweise gegen von den Heizelementen (18, 18a) kommende direkte Strahlung abgeschirmt ist.3. Radiant heater according to claim 1 or 2, characterized in that the temperature sensor (20, 20a) is at least partially shielded against direct radiation coming from the heating elements (18, 18a). 4. Strahlheizkörper nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Temperaturfühler (20, 20a) der von der Platte (12) her kommenden Strahlung vorzugsweise über seine ganze Länge ausgesetzt ist. -4. Radiant heater according to one of the preceding claims, characterized in that the temperature sensor (20, 20a) of the radiation coming from the plate (12) is preferably exposed over its entire length. - 5. Strahlheizkörper nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Temperaturfühler (20, 20a) teilweise von thermischem Isoliermaterial umgeben ist und dabei vorzugsweise über einen Teil seines Umfanges und/oder seiner Länge, vorteilhaft in seinem unteren Umfangsabschnitt, in Kontakt mit dem thermischen Isoliermaterial (16) ist und vorzugsweise in einer Rinne (26) aus Isoliermaterial liegt.5. Radiant heater according to one of the preceding claims, characterized in that the temperature sensor (20, 20a) is partially surrounded by thermal insulating material and preferably over part of its circumference and / or its length, advantageously in its lower peripheral portion, in contact with the is thermal insulation material (16) and preferably lies in a groove (26) made of insulation material. 6. Strahlheizkörper nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Temperaturfühler (20, 20a) im Bereich eines in seiner Längsrichtung verlaufenden Steges (25, 25a) liegt, der.über die Ebene der Heizelemente (18) hochragt und vorteilhaft zwei gesonderte Abschnitte (22, 23) der Heizzone (21a) voneinander zumindest teilweise trennt und insbesondere aus einem gepreßten faserigen Isoliermaterial, vorzugsweise einer Aluminiumsilikatfaser, besteht.6. Radiant heater according to one of the preceding claims, characterized in that the temperature sensor (20, 20a) lies in the region of a web (25, 25a) running in its longitudinal direction, which protrudes above the level of the heating elements (18) and advantageously two separate ones Sections (22, 23) of the heating zone (21a) at least partially separate from one another and in particular consist of a pressed fibrous insulating material, preferably an aluminum silicate fiber. 7. Strahlheizkörper nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die temporäre thermische Abschirmung auf einem Teil der die Heizzone (21a) überragenden Länge des Temperaturfühlers (20a) vorgesehen ist und daß auf diesem Teil (32) die thermische Ansprechempfindlichkeit des Temperaturfühlers (20a) erhöht ist.7. Radiant heater according to one of the preceding claims, characterized in that the temporary thermal shield is provided on a part of the heating zone (21a) projecting length of the temperature sensor (20a) and that on this part (32) the thermal sensitivity of the temperature sensor (20a) is increased. 8. Strahlheizkörper nach Anspruch 7, dadurch gekennzeichnet, daß der abgeschirmte Teil bei einer Heizzone (21a) mit spiralig gelegten Heizelementen (18a) in einer unbeheizten Mittelzone (32) liegt.8. radiant heater according to claim 7, characterized in that the shielded part is in a heating zone (21 a) with spirally placed heating elements (18 a) in an unheated central zone (32). 9. Strahlheizkörper nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß ein Temperaturfühler (20a), der mit einem Stab und einer Hülse (33) mit unterschiedlichem thermischem Ausdehnungskoeffizienten arbeitet, in seinem abgeschirmtem Teil größere Unterschiede in den thermischen Ausdehnungskoeffizienten aufweist.9. radiant heater according to claim 7 or 8, characterized in that a temperature sensor (20a), which works with a rod and a sleeve (33) with different thermal expansion coefficient, has larger differences in the thermal expansion coefficient in its shielded part. 10. Strahlheizkörper nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Temperaturfühler (20, 20a), insbesondere seine Außenhülle, aus einem Material mit geringer Wärmeleitfähigkeit besteht.10. Radiant heater according to one of the preceding claims, characterized in that the temperature sensor (20, 20a), in particular its outer shell, consists of a material with low thermal conductivity.
EP84100541A 1983-01-26 1984-01-19 Electric radiant heating element for heating cooking or hot plates, especially glass ceramic plates Expired - Lifetime EP0116861B2 (en)

Priority Applications (1)

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AT84100541T ATE31463T1 (en) 1983-01-26 1984-01-19 ELECTRIC RADIANT RADIATOR FOR HEATING COOKING PLATES OR HOT PLATES, ESPECIALLY GLASS-CERAMIC PLATES.

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DE3302489 1983-01-26
DE3302489A DE3302489A1 (en) 1983-01-26 1983-01-26 ELECTRIC RADIATOR HEATER FOR HEATING COOKING OR WARM PLATES, ESPECIALLY GLASS CERAMIC PLATES

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EP0116861A1 true EP0116861A1 (en) 1984-08-29
EP0116861B1 EP0116861B1 (en) 1987-12-16
EP0116861B2 EP0116861B2 (en) 1994-03-02

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US3710076A (en) * 1972-02-17 1973-01-09 J Frazier Radiant surface-heater and temperature sensing assembly
FR2261695A7 (en) * 1974-02-19 1975-09-12 Licentia Gmbh Ceramic hot plate with heating coil - free ends of coil and expansion regulator housed in grooves in insulating block below
FR2299783A1 (en) * 1975-01-30 1976-08-27 Bosch Siemens Hausgeraete Electrical coffee machine heat retention plate - has heating element distance spring controlled by external distance components
DE2729929A1 (en) 1977-07-02 1979-01-04 Karl Fischer Radiative heating element for ceramic hob on cooker - has spiral heating filament embedded in radial retaining ribs on plate
DE7826549U1 (en) 1978-09-07 1978-12-14 E.G.O. Elektro-Geraete Blanc U. Fischer, 7519 Oberderdingen TEMPERATURE LIMITER FOR GAS-HEATED CERAMIC GLASS COOKING SURFACES
DE2839161A1 (en) * 1978-09-08 1980-03-20 Ego Regeltech Temp. limiter for vitreous ceramic cooking utensil - has main power switch and second switch warning against touching heated surface
DE3007037A1 (en) 1980-02-26 1981-09-03 Ego Elektro Blanc & Fischer GLASS CERAMIC COOKER
EP0037638B1 (en) * 1980-03-05 1984-05-09 Kenwood Manufacturing Company Limited Cooking apparatus

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4665307A (en) * 1983-09-10 1987-05-12 Micropore International Limited Thermal cut-out device for radiant heaters
GB2192279A (en) * 1983-09-10 1988-01-06 Micropore International Ltd Thermal cut-out devices for radiant heaters
WO1985001412A1 (en) * 1983-09-10 1985-03-28 Micropore International Limited Thermal cut-out devices for radiant heaters
US4901049A (en) * 1987-02-19 1990-02-13 E.G.O. Elektro-Gerate Blanc U. Fischer Temperature limiter
EP0279368A2 (en) 1987-02-19 1988-08-24 E.G.O. Elektro-Geräte Blanc und Fischer GmbH & Co. KG Temperature limiter
EP0288915A2 (en) * 1987-05-01 1988-11-02 E.G.O. Elektro-Geräte Blanc u. Fischer Electric radiant heating element for heating a plate, in particular a glass-ceramic plate
EP0288915A3 (en) * 1987-05-01 1989-01-04 E.G.O. Elektro-Gerate Blanc U. Fischer Electric radiant heating element for heating a plate, inelectric radiant heating element for heating a plate, in particular a glass-ceramic plate particular a glass-ceramic plate
DE3821495A1 (en) * 1988-06-25 1989-12-28 Ego Elektro Blanc & Fischer Temperature switch
DE3821496A1 (en) * 1988-06-25 1989-12-28 Ego Elektro Blanc & Fischer Temperature switch
DE3929965A1 (en) * 1989-09-08 1991-03-14 Ego Elektro Blanc & Fischer TEMPERATURE SWITCH
US5113170A (en) * 1989-09-08 1992-05-12 E.G.O. Elektro-Gerate Blanc U. Fischer Temperature switch
GB2340715A (en) * 1998-08-14 2000-02-23 Ceramaspeed Ltd Temperature sensor/element arrangement in a radiant electric heater
GB2340715B (en) * 1998-08-14 2003-01-29 Ceramaspeed Ltd Radiant electric heater
GB2360591A (en) * 2000-03-23 2001-09-26 Ceramaspeed Ltd Temperature sensor for use in a cooking appliance
GB2360591B (en) * 2000-03-23 2004-04-28 Ceramaspeed Ltd Temperature sensor
US7417207B2 (en) 2005-02-01 2008-08-26 E.G.O. Elektro-Geraetebau Gmbh Heating device with temperature sensor and hob with heating devices

Also Published As

Publication number Publication date
EP0116861B1 (en) 1987-12-16
EP0116861B2 (en) 1994-03-02
DE3468159D1 (en) 1988-01-28
DE3302489A1 (en) 1984-07-26
ATE31463T1 (en) 1988-01-15

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