EP0081073B1 - Radiant heater for heating cooking or heating plates - Google Patents

Radiant heater for heating cooking or heating plates Download PDF

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Publication number
EP0081073B1
EP0081073B1 EP82109730A EP82109730A EP0081073B1 EP 0081073 B1 EP0081073 B1 EP 0081073B1 EP 82109730 A EP82109730 A EP 82109730A EP 82109730 A EP82109730 A EP 82109730A EP 0081073 B1 EP0081073 B1 EP 0081073B1
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EP
European Patent Office
Prior art keywords
heating
radiant heater
cooking
insulation
heating element
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Application number
EP82109730A
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German (de)
French (fr)
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EP0081073A1 (en
Inventor
Gerhard Gössler
Eugen Wilde
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EGO Elektro Geratebau GmbH
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EGO Elektro Gerate Blanc und Fischer GmbH
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Priority to AT82109730T priority Critical patent/ATE18297T1/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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater
    • 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
    • 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
    • H05B2213/07—Heating plates with temperature control means

Definitions

  • the invention relates to an electric radiant heater for heating cooking or heating surfaces, in particular glass ceramic plates, with a carrier shell and a thermal and / or electrical insulation arranged therein and a heating element arranged thereon at a distance from the cooking or heating surface, and with a at least partially protruding temperature sensor over the heating element.
  • Such radiant heaters are known from DE-A-28 39161 and 29 43 477 and DE-U-81 03 514.
  • the temperature sensors belong to temperature regulators or limiters or displays for the hot state of the cooking or heating surface or combinations thereof.
  • the overall height is limited, on the one hand, by the fact that a reduction in the insulation height increases the temperatures on the underside of the carrier shell and the energy loss, on the other hand, a certain minimum distance between the radiant heaters and the cooking or heating surfaces must be maintained, and furthermore the arrangement of a temperature sensor between the heating element and Glass ceramic plate increases this distance even further, since the thickness of the temperature sensor, including the necessary distances to the cooking and heating surfaces or the heating spirals, is greater than the minimum distance mentioned.
  • Radiators have become known from DE-A-28 06 369 and DE-U-74 05 641 in which the temperature sensor runs below the heating elements in a recess in the insulation. There the sensor is not arranged between the cooking surface and the heating element and is completely decoupled from the temperature of the cooking surface to be monitored.
  • the object of the invention is a radiant heater who despite a good effect Adequate electrical safety with a low overall height is to be established.
  • the temperature sensor runs in the region of a trough-like recessed section of the insulation, in which the distance of the heating element from the cooking or heating surface is increased compared to the rest of the region.
  • the heating elements can bring the heating elements to a distance from the glass ceramic plate in the area that takes up the vast majority of the entire heating surface and is not covered by the temperature sensor, which distance proves to be ideal in terms of heat technology and sufficient in terms of electrical shear. Only in The temperature sensor covered area, the distance is increased by the heating element in this temperature sensor area in a trough-shaped recessed portion of the insulation.
  • the recessed section should have an arc-shaped, in particular circular-arc-limited cross-section, that is to say it should be lowered in a gentle arc, so that on the one hand during production without additional fastenings on the other hand not by sharp of the heating elements. The lowered area can be a lot wider than the temperature sensor itself.
  • the amount of the distance, ie the lowering of the heating elements under the temperature sensor, depends on the respective circumstances. In many cases, a relatively small reduction is sufficient to reconcile the requirement for a certain height with that of electrical safety and thermal requirements.
  • the depression could, however, also be the same size as the thickness of the temperature sensor plus its distances from the cooking and heating surfaces and the heating spirals minus the through given Heating coil and In this case, the distances between all the components involved would be equal.
  • a radiant heater 11 has a flat bowl-shaped carrier shell 12, in which a two-layer insulation 13 is arranged.
  • the insulation consists of an inner, also bowl-shaped insulating layer 14 with an edge 16, which extends inside the edge 15 of the carrier shell 12 and protrudes slightly above it, and a bottom portion 17 which, like the entire radiant heater, is circular.
  • Under the insulating layer 14 is an insulating layer 18, which consists of a mechanically somewhat less solid material than the insulating layer 14, but has an even better thermal insulating ability.
  • a sleeve 22 is provided in the area of the free end of the temperature sensor.
  • the housing 21 lies outside the carrier shell and the temperature sensor 20 projects through cutouts 23 in the edge 16 of the insulating layer 14.
  • a heating element is arranged in the form of a double spiral, so that both connection ends lie in the outer region of the total heating surface and lead to a connection piece 26 with the temperature controller 19 switched on.
  • the radiant heater 11 is arranged below a cooking and heating surface 27 designed as a glass ceramic plate in such a way that it is pressed against the underside of the cooking or heating surfaces 27 by spring elements (not shown) with the insulation edge 16.
  • the temperature sensor 20, a sensor with a tube, for example made of quartz material, and an expansion rod located therein, runs through between the heating elements 25 arranged in the grooves and the underside 28 of the cooking or heating surface.
  • the bottom section 17 is lowered, so that both the surface and the groove base form a trough-shaped recessed section 30 with circular-arc-shaped boundary surfaces.
  • This section is considerably wider than the temperature sensor, but, as can be seen from FIG. 1, runs along the temperature sensor over its entire length.
  • the lowering is only a few millimeters in the example shown.
  • the distance between the heating elements and the underside 28 is therefore greater in the area of the section 30 or the temperature sensor 20 than in the rest of the area.
  • the recessed section 30 is only provided in the upper insulating layer 14, while the highly insulating insulating layer 18 remains unaffected thereby. It would also be possible to emboss the insulation layer 14 corresponding to the depression, if one did not want to accept the mechanical weakening of the insulation layer 14 in this area.
  • the edge i6 of the insulating layer 14 which experience has shown to be responsible for a large part of the heat losses, has a lower height .
  • the shape, width and depth of the recess depend on the one hand on the requirements for height and insulation as well as the thickness of the temperature sensor and electrical flap security and on the other hand on the quality of the heating elements on the insulating layer 14.
  • a particularly good result is achieved with the embedding in grooves shown , if, for example, the heating coils are positively fixed by pressing the heating coils or the insulating material. This can also be done by local deformation of the heating coil, whereby the above heating coil parts are generated be embedded in the insulating material by pressing.
  • the proposed solution can also be used in known radiant heaters with heating coils nailed onto a highly heat-insulating layer if the heating coils are each fastened at the lowest point of the depression.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Resistance Heating (AREA)
  • Baking, Grill, Roasting (AREA)

Abstract

1. Radiant heater (11) for heating cooking or heating surfaces (27), particularly of glass ceramic plates, with a support tray (12) and thermal and/or electrical insulation (13) arranged therein and a heating element (25) arranged thereon in spaced manner with respect to the cooking or heating surface (27), as well as with a heat sensor (20) projecting at least partly over the heating element (25), characterized in that the heat sensor (20) passes in the vicinity of a portion (30) of insulation (13) which is hollowed out in trough-like manner, in which the spacing of the heating element (25) from the cooking or heating surface (27) is increased with respect to the remaining heated area.

Description

Die Erfindung bezieht sich auf einen elektrischen Strahlheizkörper zur Beheizung von Koch- oder Wärmeflächen, insbesondere von Glaskeramikplatten, mit einer Trägerschale und einer darin angeordneten thermischen und/oder elektrischen Isolation und einem darauf mit Abstand von der Koch- oder Wärmefläche angeordneten Heizelement, sowie mit einem zumindest teilweise über das Heizelement hinwegragenden Temperaturfühler.The invention relates to an electric radiant heater for heating cooking or heating surfaces, in particular glass ceramic plates, with a carrier shell and a thermal and / or electrical insulation arranged therein and a heating element arranged thereon at a distance from the cooking or heating surface, and with a at least partially protruding temperature sensor over the heating element.

Aus den DE-A- 28 39161 und 29 43 477 sowie dem DE-U-81 03 514 sind derartige Strahlheizkörper bekannt geworden. Die Temperaturfühler gehören zu Temperaturreglern oder -begrenzern bzw. Anzeigen für den Heißzustand der Kochoder Wärmefläche bzw. Kombinationen davon.Such radiant heaters are known from DE-A-28 39161 and 29 43 477 and DE-U-81 03 514. The temperature sensors belong to temperature regulators or limiters or displays for the hot state of the cooking or heating surface or combinations thereof.

Es wird gefordert, die Bauhöhe der Strahlheizkörper möglichst gering zu halten, um ihren Einbau auch in relativ flache, beispielsneise in Küchenmöbel einzubauende Einbaueinberen zu ermöglichen. Die Bauhöhe wird jedoch einerseits dadurch begrenzt, daß eine Verringerung der lsolationshöhe die Temperaturen an der Unterseite der Trägerschale und den Energieverlust anwachsen läßt, andererseits ein gewisser Mindestabstand der Strahlheizkörper von den Koch- oder Wärmeflächen eingehalten werden muß und ferner die Anordnung eines Temperaturfühlers zwischen Heizelement und Glaskeramikplatte diesen Abstand noch weiter erhöht, da die Dicke des Temperaturfühlers einschließlich der notwendigen Abstände zu den Koch- und Wärmeflächen bzw. den Heizspiralen größer als der erwähnte Mindestabstand ist.It is required to keep the height of the radiant heaters as low as possible in order to enable them to be installed in relatively flat recesses, for example in kitchen furniture. The overall height is limited, on the one hand, by the fact that a reduction in the insulation height increases the temperatures on the underside of the carrier shell and the energy loss, on the other hand, a certain minimum distance between the radiant heaters and the cooking or heating surfaces must be maintained, and furthermore the arrangement of a temperature sensor between the heating element and Glass ceramic plate increases this distance even further, since the thickness of the temperature sensor, including the necessary distances to the cooking and heating surfaces or the heating spirals, is greater than the minimum distance mentioned.

Es ist schon versucht worden, die Temperaturfühler im wesentlichen in der gleichen Ebene der Heizelemente zu beiden Seiten oder auch in der Mitte eines Heizelementes anzuordnen, wobei jedoch die Heizwiderstände geradlinig parallel geführt werden müssen und auch der Zugriff des Temperaturfühlers zur Temperatur der Heizwiderstände und der Glaskeramikplatte nicht immer ideal ist. Diese Lösung ist nicht brauchbar, wenn man einen runden Strahlheizkörper mit spiral angeordneten Heizelementen herstellen will.Attempts have already been made to arrange the temperature sensors essentially in the same plane of the heating elements on both sides or in the middle of a heating element, but the heating resistors must be guided in a straight line in parallel and also the temperature sensor's access to the temperature of the heating resistors and the glass ceramic plate is not always ideal. This solution is not useful if you want to produce a round radiant heater with spirally arranged heating elements.

Aus der DE-A-28 06 369 und der DE-U-74 05 641 sind Heizkörper bekannt geworden, bei denen der Temperaturfühler unterhalb der Heizelemente in einer Vertiefung der Isolation verläuft. Dort ist der Fühler nicht zwischen Kochfläche und Heizelement angeordnet und von der zu überwachenden Temperatur der Kochfläche völlig entkoppelt.Radiators have become known from DE-A-28 06 369 and DE-U-74 05 641 in which the temperature sensor runs below the heating elements in a recess in the insulation. There the sensor is not arranged between the cooking surface and the heating element and is completely decoupled from the temperature of the cooking surface to be monitored.

Aufgabe der Erfindung ist es, einen Strahlheizkörper

Figure imgb0001
, der trotz einer im Effekt guten
Figure imgb0002
ausreichender elektrischer Sicherhe.t mit geringer Bauhöhe herzustellen ist.The object of the invention is a radiant heater
Figure imgb0001
who despite a good effect
Figure imgb0002
Adequate electrical safety with a low overall height is to be established.

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß der Temperaturfühler im Bereich eines muldenartig vertieften Abschnittes der Isolation verläuft, in dem der Abstand des Heizelementes von der Koch- oder Wärmefläche gegenüber dem übrigen Bereich vergrößert ist.This object is achieved according to the invention in that the temperature sensor runs in the region of a trough-like recessed section of the insulation, in which the distance of the heating element from the cooking or heating surface is increased compared to the rest of the region.

Dadurch ist es möglich, in dem den weit überwiegenden Anteil der gesamten Heizfläche einnehmenden, nicht vom Temperaturfühler überdeckten Bereich die Heizelemente auf einen Abstand an die Glaskeramikplatte heranzubringen, der sich als wärmetechnisch ideal und von der elektrischen Scherheit her als ausreichend erweist. Nur in

Figure imgb0003
Temperaturfühler überdeckten Bereich ist der Abstand vergrößert, indem das Heizelement in diesem Temperaturfühlerbereich in einem muldenförmig vertieften Abschnitt der Isolation verläuft. Vorzugsweise sollte der vertiefte Abschnitt einen bogenförmig, insbesondere kreisbogenförmig begrenzten Querschnitt haben, d.h. in einem sanften Bogen abgesenkt sein, um einerseits bei der Herstellung ohne zusätzliche Befestigungen
Figure imgb0004
andererseits nicht durch scharfe
Figure imgb0005
der Heizelemente zu beeintr- htigen. Dabei kann der abgesenkte Bereich um einiges breiter sein als der Temperaturfühler selbst. Es hat sich gezeigt, daß die gewünschte Wärmeübertragung zur Koch- oder Wärmefläche nicht wesentlich beeinträchtigt wird und wächung der Isolation zur Unterse" falls nicht
Figure imgb0006
, weil dieser Bereich nur einen kieinen S.ucnteii der Gesamtfläche ausmacht. Die Aufrechterhaltung einer guten Isolation wird ferner dadurch gefördert, daß der vertiefte Abschnitt bei einer mehrschichtigen Isolation in der oberen Schicht vorgesehen ist, die meist mechanisch etwas fester, jedoch thermisch nicht so gut isolierend ist wie die darunter ange solierschicht, die unbeeinträchtigt bie.This makes it possible to bring the heating elements to a distance from the glass ceramic plate in the area that takes up the vast majority of the entire heating surface and is not covered by the temperature sensor, which distance proves to be ideal in terms of heat technology and sufficient in terms of electrical shear. Only in
Figure imgb0003
The temperature sensor covered area, the distance is increased by the heating element in this temperature sensor area in a trough-shaped recessed portion of the insulation. Preferably, the recessed section should have an arc-shaped, in particular circular-arc-limited cross-section, that is to say it should be lowered in a gentle arc, so that on the one hand during production without additional fastenings
Figure imgb0004
on the other hand not by sharp
Figure imgb0005
of the heating elements. The lowered area can be a lot wider than the temperature sensor itself. It has been shown that the desired heat transfer to the cooking or heating surface is not significantly impaired and insulation insulation to the bottom "if not
Figure imgb0006
because this area is only a small S.ucnteii of the total area. The maintenance of good insulation is further promoted by the fact that the recessed section is provided with a multilayer insulation in the upper layer, which is usually somewhat mechanically stronger, but not as thermally insulating as the insulation layer below, which is unaffected.

Der Betrag der

Figure imgb0007
des Abstandes, d.h. der Absenkung der Heizeiemente unter dem Temperaturfühler, hängt von den jeweiligen Gegebenheiten ab. Schon eine relativ geringe Absenkung reicht in vielen Fällen aus, um die Forderung nach einer bestimmten Bauhöhe mit der der elektrischen Sicherheit und den thermischen Anforderungen in Einklang zu bringen. Die Vertiefung könnte jedoch auch gleich groß sein, wie die Dicke des Temperaturfühlers zzgl. dessen Abständen zu den Koch- und Wärmflächen und den Heizspiralen minus des durch die
Figure imgb0008
gegebenen
Figure imgb0009
Heizspirale und
Figure imgb0010
In diesem Falle würden zwoonen allen beteiligten Bauteilen gleiche Abstände vorliegen.The amount of
Figure imgb0007
the distance, ie the lowering of the heating elements under the temperature sensor, depends on the respective circumstances. In many cases, a relatively small reduction is sufficient to reconcile the requirement for a certain height with that of electrical safety and thermal requirements. The depression could, however, also be the same size as the thickness of the temperature sensor plus its distances from the cooking and heating surfaces and the heating spirals minus the through
Figure imgb0008
given
Figure imgb0009
Heating coil and
Figure imgb0010
In this case, the distances between all the components involved would be equal.

Es hat sich gezeigt, daß auch die Wirkung des Temperaturfühlers, d.h. seine thermische Ankopplung an die beheizte Platte einerseits und die Temperatur der Heizelemente andererseits erstaunlicherweise bei der Maßnahme der Erfindung nicht leidet. Im Gegenteil wird ein sehr genaues und schnelles Ansprechen erzielt, was evtl. auf die etwas größere Umschließung des Temperaturfühlers durch die Heizelemente zurückzufUhren ist. Vor allem kann jetzt ohne Rücksicht auf die Bauhöhe der Abstand des Temperaturfühlers von den Heizelementen und der Unterseite der beheizten Platte so bemessen Werden, daß die gewünschte Reglercharaktersitik optimal erreicht wird.It has been shown that the effect of the temperature sensor, ie its thermal coupling to the heated plate on the one hand and the temperature of the heating elements on the other hand surprisingly does not suffer from the measure of the invention. On the contrary, a very precise and quick response is achieved, which may be due to the somewhat larger enclosure of the Temperature sensor through the heating elements. Above all, regardless of the height, the distance of the temperature sensor from the heating elements and the underside of the heated plate can now be dimensioned in such a way that the desired regulator characteristic is optimally achieved.

Bevorzugt wird die Erfindung bei einem Strahlheizkörper eingesetzt, dessen Heizelement eine in Form von im wesentlichen offenen Spiralwindungen auf der Oberfläche der Isolation liegende bzw..in Nuten der Isolation verlaufende Heizwendel ist. Derartige Anordnungen und Einbettungen von Heizwendeln sind aus den zitierten Druckschriften bekannt, beispielsweise aus der DE-A- 29 43 477 eine Anordnung in Nuten und aus der DE-A- 28 20 138 sowie in dem DE-GM 81 03 514 eine Anordnung auf einer im wesentlichen ebenen Fläche, wobei in Längsabständen der Heizwendel diese teilweise durch Einpressung eingebettet ist. In diesem Falle ist die Verwendung deswegen besonders bevorzugt, weil hier die Forderungen bzgl. der elektrischen Oberschlagsicherheit besonders hoch sind. Bei ebenfalls verwendbaren elektrischen Rohrheizkörpern ist diese Forderung nicht so strikt. Weitere vorteilhafte Merkmale der Erfindung sind in Unteransprüchen und der Beschreibung im Zusammenhang mit der Zeichnung beschrieben und dargestellt. Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher erläutert. Es zeigen:

  • Fig. 1 eine schematische Draufsicht auf einen Strahlheizkörper und
  • Fig. 2 einen vergrößerten Detail-Querschnitt nach der Linie 11-11 in Fig. 1.
The invention is preferably used in a radiant heater, the heating element of which is a heating coil lying in the form of essentially open spiral windings on the surface of the insulation or running in grooves in the insulation. Such arrangements and embedding of heating coils are known from the cited documents, for example from DE-A-29 43 477 an arrangement in grooves and from DE-A-28 20 138 and in DE-GM 81 03 514 an arrangement on one essentially flat surface, the heating coil being partially embedded in longitudinal intervals by pressing. In this case, the use is particularly preferred because the requirements regarding electrical flap security are particularly high here. This requirement is not so strict with electric tubular heaters that can also be used. Further advantageous features of the invention are described and illustrated in the subclaims and the description in connection with the drawing. An embodiment of the invention is shown in the drawing and is explained in more detail below. Show it:
  • Fig. 1 is a schematic plan view of a radiant heater and
  • 2 shows an enlarged detail cross section along the line 11-11 in FIG. 1st

Ein Strahlheizkörper 11 besitzt eine flach schüsselförmige Trägerschale 12, in der eine zweischichtige Isolation 13 angeordnet ist. Oie Isolation besteht aus einer inneren, ebenfalls schüsselförmigen Isolierschicht 14 mit einem innerhalb des Randes 15 der Trägerschale 12 verlaufenden, nach oben etwas über diesen hinausragenden Rand 16 und einem Bodenabschnitt 17, der, ebenso wie der gesamte Strahlheizkörper, kreisrund ist. Unter die Isolierschicht 14 ist eine Isolierlage 18 untergelegt, die aus einem mechanisch etwas weniger festen Material besteht als die Isolierschicht 14, dafür eine noch bessere thermische Isolierfähigkeit hat.A radiant heater 11 has a flat bowl-shaped carrier shell 12, in which a two-layer insulation 13 is arranged. The insulation consists of an inner, also bowl-shaped insulating layer 14 with an edge 16, which extends inside the edge 15 of the carrier shell 12 and protrudes slightly above it, and a bottom portion 17 which, like the entire radiant heater, is circular. Under the insulating layer 14 is an insulating layer 18, which consists of a mechanically somewhat less solid material than the insulating layer 14, but has an even better thermal insulating ability.

Ein Temperaturregler 19 mit einem stabförmigen Temperaturfühler 20, der von einem Reglergehäuse 21 ausgeht und diametral über den Strahlheizkörper hinwegragt, ist so am Strahlheizkörper angebracht, daß das Reglergehäuse relativ starr mit der Trägerschale 12 verbunden ist und der Temperaturfühler durch den Rand 15 der Trägerschale 12 an zwei gegenüberliegenden Stellen hindurchragt und am freien Ende gehaltert wird. Dazu ist im Bereich des freien Endes des Temperaturfühlers eine Hülse 22 vorgesehen. Das Gehäuse 21 liegt außerhalb der Trägerschale und der Temperaturfühler 20 ragt durch Ausschnitte 23 im Rand 16 der Isolierschicht 14 hindurch.A temperature controller 19 with a rod-shaped temperature sensor 20, which starts from a controller housing 21 and projects diametrically beyond the radiant heater, is attached to the radiant heater in such a way that the controller housing is connected relatively rigidly to the carrier shell 12 and the temperature sensor through the edge 15 of the carrier shell 12 protrudes through two opposite points and is held at the free end. For this purpose, a sleeve 22 is provided in the area of the free end of the temperature sensor. The housing 21 lies outside the carrier shell and the temperature sensor 20 projects through cutouts 23 in the edge 16 of the insulating layer 14.

Im Bodenabschnitt 17 befinden sich spiralförmig angeordnete Nuten 24, in die als offene Drahtwendein aus Widerstandsdraht ausgebildete Heizelemente 25 eingelegt sind. Im dargestellten Beispiel ist ein Heizelement in Form einer doppelt gelegten Spirale angeordnet, so daß beide Anschluß-enden im Außenbereich der Gesamtheizfläche liegen und zu einem Anschlußstück 26 unter Einschaltung des Temperaturreglers 19 führen.In the bottom section 17 there are spirally arranged grooves 24, into which heating elements 25 formed as open wire turns made of resistance wire are inserted. In the example shown, a heating element is arranged in the form of a double spiral, so that both connection ends lie in the outer region of the total heating surface and lead to a connection piece 26 with the temperature controller 19 switched on.

Der Strahlheizkörper 11 ist unterhalb einer als Glaskeramikplatte ausgebildeten Koch- und Wärmefläche 27 so angeordnet, daß er durch nicht dargestellte Federelemente mit dem Isolationsrand 16 an die Unterseite der Koch- oder Wärmeflächen 27 angedrückt wird. Der Temperaturfühler 20, ein Fühler'mit einem Rohr, z.B. aus Quarzgut, und darin liegendem Ausdehnungsstab, läuft in dem zwischen den in den Nuten angeordneten Heizelementen 25 und der Unterseite 28 der Koch-oder Wärmefläche hindurch. In seinem Bereich ist der Bodenabschnitt 17 abgesenkt, so daß sowohl die Oberfläche als auch der Nutgrund einen muldenförmig vertieften Abschnitt 30 mit kreisbogenförmigen Begrenzungsflächen bildet. Dieser Abschnitt ist wesentlich breiter als der Temperaturfühler, verläuft aber, wie aus Fig. zu sehen ist, längs des Temperaturfühlers über dessen ganze Länge hindurch. Die Absenkung beträgt im dargestellten Beispiel nur einige Millimeter. Daher ist der Abstand der Heizelemente von der Unterseite 28 im Bereich des Abschnittes 30 bzw. des Temperaturfühlers 20 größer als im übrigen Bereich. Der vertiefte Abschnitt 30 ist nur in der oberen Isolierschicht 14 vorgesehen, während die hoch isolierende Isolierlage 18 davon unbeeinflußt bleibt. Es wäre auch möglich, die Isolierlage 14 entsprechend der Vertiefung nach unten auszuprägen, falls man die mechanische Schwächung der Isolierschicht 14 in diesem Bereich nicht in Kauf nehmen wollte. Zu den thermischen Vorteilen, die bei gegebener Gesamthöhe des Strahlheizkörpers durch die Höherlegung der Heizelemente mit verstärkter Isolation erzielt werden, kommt noch, daß der Rand i6 der Isolierschicht 14, der erfahrungsgemäß für einen gro-ßen Teil der Wärmeverluste verantwortlich ist, eine geringere Höhe hat. Form, Breite und Tiefe der Vertiefung hängen einerseits von den Anforderungen an Bauhöhe und Isolierung sowie Dicke des Temperaturfühlers und elektrische Oberschlagsicherheit ab und andererseits von der Güte der Festlegung der Heizelemente an der Isolierschicht 14. Bei der dargestellten Einbettung in Nuten wird ein besonders gutes Ergebnis erzielt, wenn z.B. durch eine Verpressung der Heizwendeln oder des Isoliermaterials eine formschlüssige Festlegung der Heizwendeln erfolgt. Dies kann auch durch stellenweise Verformung der Heizwendel geschehen, wodurch vorstehende Heizwendelteile erzeugt werden, die in das Isoliermaterial durch Einpressen eingebettet werden. Die vorgeschlagene Lösung ist aber auch bei bekannten Strahlheizkörpern mit auf einer hochwärmedämmenden Isolierschicht aufgenagelten Heizwendeln anwendbar, wenn die Heizwendeln jeweils am tiefsten Punkt der Vertiefung befestigt sind.The radiant heater 11 is arranged below a cooking and heating surface 27 designed as a glass ceramic plate in such a way that it is pressed against the underside of the cooking or heating surfaces 27 by spring elements (not shown) with the insulation edge 16. The temperature sensor 20, a sensor with a tube, for example made of quartz material, and an expansion rod located therein, runs through between the heating elements 25 arranged in the grooves and the underside 28 of the cooking or heating surface. In its area, the bottom section 17 is lowered, so that both the surface and the groove base form a trough-shaped recessed section 30 with circular-arc-shaped boundary surfaces. This section is considerably wider than the temperature sensor, but, as can be seen from FIG. 1, runs along the temperature sensor over its entire length. The lowering is only a few millimeters in the example shown. The distance between the heating elements and the underside 28 is therefore greater in the area of the section 30 or the temperature sensor 20 than in the rest of the area. The recessed section 30 is only provided in the upper insulating layer 14, while the highly insulating insulating layer 18 remains unaffected thereby. It would also be possible to emboss the insulation layer 14 corresponding to the depression, if one did not want to accept the mechanical weakening of the insulation layer 14 in this area. In addition to the thermal advantages that are achieved for a given total height of the radiant heater by raising the heating elements with reinforced insulation, the edge i6 of the insulating layer 14, which experience has shown to be responsible for a large part of the heat losses, has a lower height . The shape, width and depth of the recess depend on the one hand on the requirements for height and insulation as well as the thickness of the temperature sensor and electrical flap security and on the other hand on the quality of the heating elements on the insulating layer 14. A particularly good result is achieved with the embedding in grooves shown , if, for example, the heating coils are positively fixed by pressing the heating coils or the insulating material. This can also be done by local deformation of the heating coil, whereby the above heating coil parts are generated be embedded in the insulating material by pressing. However, the proposed solution can also be used in known radiant heaters with heating coils nailed onto a highly heat-insulating layer if the heating coils are each fastened at the lowest point of the depression.

Claims (6)

1. Radiant heater (11) for heating cooking or heating surfaces (27), particularly of glass ceramic plates, with a support tray (12) and thermal and/or electrical insulation (13) arranged therein and a heating element (25) arranged thereon in spaced manner with respect to the cooking or heating surface (27), ss well as with a heat sensor (20) projecting at least partly over the heating element (25), characterized in that the heat sensor (20) passes in the vicinity of a portion (30) of insulation (13) which is hollowed out in trough-like manner, in which the spacing of the heating element (25) from the cooking or heating surface (27) is increased with respect to the remaining heated area.
2. Radiant heater according to claim 1, characterized in that the insulation (13) is in multilayer form and that the portion (30) hollowed out in trough-like manner is located in the upper insulating layer (14).
3. Radiant heater according to claim 2, characterized in that the portion (30) hollowed out in trough-like manner has a curved and in particular an arcuately defined cross-section.
4. Radiant heater according to one of the preceding claims, characterized in that the heating element (25) is a heater coil in the form of substantially open spiral turns on the surface of insulation (13) or passing in slots (24) of the insulstion.
5. Radiant heater according to one of the preceding claims, characterized in that the heat sensor (20) runs roughly diametrically over the radiant heater.
6. Radiant heater according to one of the preceding claims, characterized in that the heat sensor (20) is constructed in rod-like manner and emanates from a regulator housing (21 which is positioned outside the edge (15) of the support tray (12) and that the heat sensor (20), preferably in the vicinity of its two ends projects through the edge (15) of support tray (12) and is optionally mounted there in mounting support portions (22).
EP82109730A 1981-11-04 1982-10-21 Radiant heater for heating cooking or heating plates Expired EP0081073B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82109730T ATE18297T1 (en) 1981-11-04 1982-10-21 RADIANT HEATING ELEMENTS FOR HEATING COOKING OR HEATING SURFACE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813143692 DE3143692A1 (en) 1981-11-04 1981-11-04 BEAM RADIATORS FOR HEATING COOKING AND HEATING SURFACES
DE3143692 1981-11-04

Publications (2)

Publication Number Publication Date
EP0081073A1 EP0081073A1 (en) 1983-06-15
EP0081073B1 true EP0081073B1 (en) 1986-02-26

Family

ID=6145543

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82109730A Expired EP0081073B1 (en) 1981-11-04 1982-10-21 Radiant heater for heating cooking or heating plates

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EP (1) EP0081073B1 (en)
AT (1) ATE18297T1 (en)
DE (2) DE3143692A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3536981A1 (en) * 1985-10-17 1987-04-23 Ako Werke Gmbh & Co OVERHEATING PROTECTION SWITCH OF A RADIATION HEATING
DE8706277U1 (en) * 1987-05-01 1987-06-25 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Electric radiant heater for heating a plate, in particular a glass ceramic plate
GB2336985A (en) * 1998-04-30 1999-11-03 Ceramaspeed Ltd A radiant electric heater having both a lamp-form heating element and a ribbon heating element
GB2340715B (en) * 1998-08-14 2003-01-29 Ceramaspeed Ltd Radiant electric heater
GB0301169D0 (en) 2003-01-18 2003-02-19 Ceramaspeed Ltd Radiant electric heater

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8103514U1 (en) * 1981-06-25 Fischer, Karl, 7519 Oberderdingen Temperature-sensitive switch, in particular for a signal device on cooking appliances

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7405641U (en) * 1974-08-01 Licentia Gmbh Glass ceramic hotplate
GB1562251A (en) * 1977-02-10 1980-03-05 Micropore Internation Ltd Electrical heating units
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
DE2943477C2 (en) * 1979-10-27 1987-11-26 E.G.O. Elektro-Geraete Blanc U. Fischer, 7519 Oberderdingen, De Control switch for hotplate or heat storage device - has rotary setting member also operating switch that connects in extra heating element
DE3007037A1 (en) * 1980-02-26 1981-09-03 Ego Elektro Blanc & Fischer GLASS CERAMIC COOKER

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8103514U1 (en) * 1981-06-25 Fischer, Karl, 7519 Oberderdingen Temperature-sensitive switch, in particular for a signal device on cooking appliances

Also Published As

Publication number Publication date
DE3269441D1 (en) 1986-04-03
DE3143692A1 (en) 1983-05-11
EP0081073A1 (en) 1983-06-15
ATE18297T1 (en) 1986-03-15

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