EP0021107B2 - Radiant heating element for a cooking unit equipped with temperature sensor - Google Patents

Radiant heating element for a cooking unit equipped with temperature sensor Download PDF

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Publication number
EP0021107B2
EP0021107B2 EP80103010A EP80103010A EP0021107B2 EP 0021107 B2 EP0021107 B2 EP 0021107B2 EP 80103010 A EP80103010 A EP 80103010A EP 80103010 A EP80103010 A EP 80103010A EP 0021107 B2 EP0021107 B2 EP 0021107B2
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EP
European Patent Office
Prior art keywords
heating element
heating
heat transfer
edge
cooking surface
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Expired
Application number
EP80103010A
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German (de)
French (fr)
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EP0021107B1 (en
EP0021107A1 (en
Inventor
Eugen Wilde
Günther Scharpf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EGO Elektro Geratebau GmbH
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EGO Elektro Gerate Blanc und Fischer GmbH
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Application filed by EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Priority to AT80103010T priority Critical patent/ATE2925T1/en
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0258—For cooking
    • H05B1/0261—For cooking of food
    • H05B1/0266—Cooktops
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/102—Tops, e.g. hot plates; Rings electrically heated
    • F24C15/105—Constructive details concerning the regulation of the temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/06—Arrangement or mounting of electric heating elements
    • F24C7/067—Arrangement or mounting of electric heating elements on ranges
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/746—Protection, e.g. overheat cutoff, hot plate indicator
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • 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
    • H05B2213/05—Heating plates with pan detection means

Definitions

  • the invention relates to a radiant heating element for a cooking unit with a cooking surface, in particular made of glass ceramic, in which the heating is carried out by radiant heating resistors which are arranged in an insulation accommodated by a carrier shell, with a temperature sensor arranged outside the heating element in the edge region thereof a control device and a heat transfer element which is in thermal contact with the temperature sensor, which extends under surface contact on the underside of the cooking surface between the cooking surface and the edge of the insulation adjacent to it and whose outer section is at a distance from the cooking surface.
  • a heating unit has become known in which there is a section in the edge area that is not heated, that is to say unheated, in which a temperature sensor is arranged, which is pressed against the glass ceramic plate from below. It is stated therein that the laying of the temperature sensor in the edge area of the heating unit has the advantage over the arrangement in the central area that a representative result can also be obtained when using pots with a recessed central area.
  • the known proposal has the disadvantage that no heating takes place in the section in which the sensor is arranged, so that the sensor result is determined almost exclusively by the temperature at the bottom of the saucepan because of the relatively poor cross-conduction in the glass ceramic material, and thus provides no information for this whether the glass ceramic plate may be heated.
  • there is a "cold spot" in the area of the heating unit which could be noticeable, for example, when a pancake is being prepared in the insufficient heating of a section.
  • the guidance of these heating elements through the section to be excluded is made more difficult.
  • a metal hotplate which has a spring clip fixed there on the underside of its unheated central zone, which presses a heat transfer element, which is inserted between it and the hotplate body and carries a temperature controller, onto the hotplate body.
  • the plug-on facilitates the attachment of the heat transfer element, but requires an additional part to be attached to the hotplate and also only allows a plug-on position.
  • the object of the invention is to provide a radiant heating element in which the temperature sensor is coupled to the heating of the radiant heating elements and to the temperature of the glass ceramic plate with good adaptability to changing conditions during installation without significantly affecting the uniform heating.
  • the heat transfer element can preferably have the shape of an essentially flat plate made of a highly heat-conducting sheet.
  • the invention therefore makes it possible to arrange the temperature sensor outside the preferably circular heating area of the heating element and still to sense the temperature in the edge area of the heating element itself, ie also in the area occupied by the cooking vessel.
  • the heat transfer element lies at least partially on the underside of the glass ceramic plate with thermal contact, so that heat is applied to it both from above and from below.
  • the heat transfer element that carries the sensor is inserted between the edge of the heating element and the glass ceramic plate and clamped there.
  • the sensor is simply plugged into the heating element, so that it can be attached to any heating element and above all at any point on its circumference. This enables particularly good adaptation to changing conditions during installation.
  • Fig. 1 shows a heating element 11, which consists of a flat, open sheet metal shell 17, in which a likewise cup-shaped insulation 12 is arranged, in the electrical in spiral grooves.
  • Heating resistors 13 are in the form of coils with a flat oval basic shape.
  • the heating elements are pressed in a manner not shown resiliently from below onto a glass ceramic plate 14 and thus form the heating of a cooking unit.
  • Each heating element heats a hotplate, specifically because of the distance between the heating resistors 13 and the glass ceramic plate (space 15 in the recess in the insulation) by radiation.
  • the insulation 12 has a raised edge 16, the upper side of which protrudes somewhat above the upper edge of the sheet metal shell 17 receiving it, and which is thus intended to rest on the underside of the glass ceramic.
  • a heat transfer element 18 is inserted, which is made from a substantially flat plate made of a highly heat-conducting sheet, for example brass or copper sheet. Its shape can be seen from Fig. 2. In plan view, the basic shape is essentially T-shaped.
  • the T-bar forms an elongated region 19 lying in the circumferential direction of the essentially circular heating element at its edge, which is approximately lenticular and also has a lenticular region 20 which protrudes inwards from the edge 16 into the heated space 15 and thereby in the edge region some heating resistors 13 partially covered.
  • the remaining part of the area 19 lies between the edge 16 and the glass ceramic plate 14.
  • resilient fastening tabs 22 are provided, which enable the heat transfer element 18 to be clamped on the edge of the sheet metal shell 17.
  • two downward angled portions 23 are provided on two relatively distant circumferential sections of the edge 21, which can be inserted into the gap between the edge 16 and the sheet metal shell 17.
  • An outer section 24 projects outward from the area 19 of the heat transfer element 18 beyond the edge of the heating element.
  • the sensor socket 28 is a sensor socket filled with an expansion liquid, which is connected via a capillary tube 29 to a temperature regulator, not shown, which regulates the heating of the heating element.
  • the sensor can 28 is pressed by a compression spring 30 against the heat transfer surface 27, which is supported on a holding mechanism 31 which guides the sensor can and is attached to the outer section of the heat transfer element.
  • the arrangement of the sensor socket and the holding mechanism can be arrangements according to German patents 15 65 512 or 24 22 687. However, other sensor types and attachments are also possible. For example, an electrical NTC or PTC sensor can also be used, which is pressed on resiliently or is fixedly attached to the outer section 24. The design of the outer section is completely free. As a result, the sensor arrangement can also be chosen arbitrarily. For example, it is also possible to bend the outer section 90 ° with respect to the heated section 19 and to position the sensor from the side. This could U. the size can be kept smaller.
  • the temperature sensing device 32 which is formed from the heat transfer element 18 and the temperature sensor 28, is easy to attach to the heating element 11 by fastening it through the two relatively widely spaced push-on fasteners 22, 23 and finally holding it by clamping it between the edge and the glass ceramic plate.
  • the attachment can be made at any point on the circumference, so that the situation Installation needs can be adapted.
  • the attachment is not limited to a specific type or size of heating elements.
  • the same temperature sensing device can be attached to heating elements of different diameters.
  • the heating resistors can be arranged in a simple manner and no longer need to be deflected around the sensor area.
  • the size and shape of the inner portion 20 depends on various factors. These are, on the one hand, the distance of the heating resistors from the glass ceramic plate, their performance, the desired access by the temperature controller, the thickness of the heat transfer element and the size and intensity of the contact between the heat transfer element and the glass ceramic plate. Good contact is advantageous here, but is not required over the entire area.
  • the heat transfer element 18 could consist of a brass sheet 0.5 mm thick, which has dimensions of 80 to 90 mm in the circumferential direction of the heating element and whose maximum penetration depth T (see FIG. 2) in the heated area 20 is up to 25 mm.
  • the invention provides the advantage that the heat supplied to the temperature sensor is conducted to the outside without the need to arrange the temperature sensor itself in the heated area, where the temperature sensor is in a colder environment and only receives the heat in a very defined manner.
  • a conventional protection element for example consisting of a rod-shaped temperature sensor arranged transversely over the heating surface, against overheating of the glass ceramic plate.
  • stiffening ribs or beads can be provided there, which run radially and axially, crossing one another.
  • Aluminum-plated steel sheet can also be used as the material for the heat transfer element.
  • the surface in the heated inner section 20 can be coated with a matt black, i.e. H. black-coated, heat-resistant lacquer in relation to radiant heat, in order to improve and equalize the absorption of radiant heat.

Abstract

1. Radiant heating element for a cooking unit with a cooking surface (14), particularly made from a glass ceramic material, heating taking place by means of radiant heating resistors (13), arranged in an insulation (12) supported by a support shell (17), with a temperature sensor (28) for a control device arranged outside the heating element in the edge area thereof, and a heat transfer element (18) in thermal contact with the temperature sensor (28) which under areal contact engages on the bottom of the cooking surface (14), extends between the cooking surface (14) and the edge (16) of the insulation (12) adjacent thereto, and the outer portion (24) of which being spaced from the cooking surface (14) characterized in that the heat transfer element (18) has an inner portion (20), projecting from the outside into the heated area of heating element (11), being spaced from heating resistors (13) and engages on cooking surface (14) also in the radiant-heated area and covers the outer heating resistors (13) on part of their circumference, and in that the heat transfer element (18) has a plugon fastening (22, 23) comprising two fastening lugs (22) peripherally spaced from one another on the periphery at the heating element (11) and which can be mounted from above on the edge of the support shell (17).

Description

Die Erfindung betrifft ein Strahlungs-Heizelement für eine Kocheinheit mit einer Kochfläche, insbesondere aus Glaskeramik, bei dem die Beheizung durch Strahlungs-Heizwiderstände erfolgt, die in einer von einer Trägerschale aufgenommenen Isolierung angeordnet sind, mit einem außerhalb des Heizelementes in dessen Randbereich angeordneten Temperaturfühler für eine Regeleinrichtung und einem mit dem Temperaturfühler in Wärmekontakt stehenden Wärmeübertragungselement, das unter flächiger Anlage an der Unterseite der Kochfläche sich zwischen die Kochfläche und den dieser benachbarten Rand der Isolierung erstreckt und dessen Außenabschnitt einen Abstand von der Kochfläche hat.The invention relates to a radiant heating element for a cooking unit with a cooking surface, in particular made of glass ceramic, in which the heating is carried out by radiant heating resistors which are arranged in an insulation accommodated by a carrier shell, with a temperature sensor arranged outside the heating element in the edge region thereof a control device and a heat transfer element which is in thermal contact with the temperature sensor, which extends under surface contact on the underside of the cooking surface between the cooking surface and the edge of the insulation adjacent to it and whose outer section is at a distance from the cooking surface.

Aus der DE-U-77 35 867 ist eine Heizeinheit bekannt geworden, bei der im Randbereich ein von der Beheizung ausgesparter, also unbeheizter Abschnitt vorhanden ist, in dem ein Temperaturfühler angeordnet ist, der von unten an die Glaskeramikplatte angedrückt wird. Es wird darin ausgeführt, daß die Verlegung des Temperaturfühlers in den Randbereich der Beheizungseinheit gegenüber der Anordnung im Mittelbereich den Vorteil hat, daß auch bei der Verwendung von Töpfen mit zurückspringendem Mittelbereich ein repräsentatives Ergebnis erfaßt werden kann.From DE-U-77 35 867 a heating unit has become known in which there is a section in the edge area that is not heated, that is to say unheated, in which a temperature sensor is arranged, which is pressed against the glass ceramic plate from below. It is stated therein that the laying of the temperature sensor in the edge area of the heating unit has the advantage over the arrangement in the central area that a representative result can also be obtained when using pots with a recessed central area.

Der bekannte Vorschlag hat allerdings den Nachteil, daß in dem Abschnitt, in dem der Fühler angeordnet ist, keine Beheizung erfolgt, so daß das Fühlerergebnis wegen der relativ schlechten Querleitung im Glaskeramikmaterial fast ausschließlich von der Temperatur am Kochtopfboden bestimmt wird und damit keine Aussage dafür liefert, ob die Glaskeramikplatte eventuell erhitzt wird. Außerdem entsteht im Bereich Beheizungseinheit ein « kalter Fleck », der sich beispielsweise bei der Zubereitung eines Pfann-- kuchens in einer nicht ausreichenden Beheizung eines Abschnittes bemerkbar machen könnte. Außerdem ist, insbesondere bei der Verwendung von Rohrheizkörpern, die Führung dieser Heizkörper durch den Auszunehmenden Abschnitt erschwert.However, the known proposal has the disadvantage that no heating takes place in the section in which the sensor is arranged, so that the sensor result is determined almost exclusively by the temperature at the bottom of the saucepan because of the relatively poor cross-conduction in the glass ceramic material, and thus provides no information for this whether the glass ceramic plate may be heated. In addition, there is a "cold spot" in the area of the heating unit, which could be noticeable, for example, when a pancake is being prepared in the insufficient heating of a section. In addition, especially when using tubular heating elements, the guidance of these heating elements through the section to be excluded is made more difficult.

Aus der US-A-3 624 352 ist ein Strahlungs-Heizelement der eingangs erwähnten Art bekannt geworden. Das Wärmeübertragungselement liegt dabei zwischen dem Rand der Isolierung und der Kochfläche, um deren Unterseite abzufühlen. Dabei wird wegen der geringen Querleitung in der Glaskeramik deren Temperatur nur sehr unvollständig erfaßt, und ein direkter Beheizungseinfluß kann bei der Temperaturreglung nicht berücksichtigt werden. Ferner besteht die Gefahrt, daß bei einem verschoben aufgesetzten Topf die Regelung verspätet oder überhaupt nicht anspricht und dadurch die Glaskeramikplatte irreparabel beschädigt wird.From US-A-3 624 352 a radiant heating element of the type mentioned in the introduction has become known. The heat transfer element lies between the edge of the insulation and the cooking surface in order to sense the underside thereof. Due to the low cross-conduction in the glass ceramic, the temperature of the latter is only recorded very incompletely, and a direct heating influence cannot be taken into account in the temperature control. Furthermore, there is a risk that the control will respond late or not at all to a shifted pot, thereby irreparably damaging the glass ceramic plate.

Aus der DE-A-27 47 652 ist eine von Rohrheizkörpern durch Wärmekontakt beheizte Glaskeramikplatte bekannt geworden, in deren unbeheiztem Mittelbereich ein Temperaturfühler unterhalb einer wärmeübertragenden Platte angebracht ist. Diese Platte stützt sich an der Glaskeramikplatte ab und ist dementsprechend deren Temperatur ausgesetzt, jedoch in einem Bereich, in dem kein guter Kontakt zum Kochgefäß vorhanden ist, nämlich dem Mittelbereich. Die innere Windung der Rohrheizkörper liegt von unten auf der wärmeübertragenden Platte auf.From DE-A-27 47 652 one of tubular heating elements heated by thermal contact has become known, in the unheated central region of which a temperature sensor is attached below a heat-transferring plate. This plate is supported on the glass ceramic plate and is accordingly exposed to its temperature, but in an area in which there is no good contact with the cooking vessel, namely the central area. The inner winding of the tubular heating element lies on the heat transfer plate from below.

Aus dieser Druckschrift ist es an sich bekannt, Steckverbindungen zwischen einem Temperaturfühler und einem Wärmeübertragungselement vorzusehen. Auf ein in der Mitte der Heizplatte vorgesehenes Fühlergehäuse ist das Wärmeübertragungselement mittels dreier ausgestanzter Lappen aufgesteckt. Es ist aber nur eine Aufsteckposition vorgesehen.From this document it is known per se to provide plug connections between a temperature sensor and a heat transfer element. The heat transfer element is attached to a sensor housing provided in the middle of the heating plate by means of three punched-out tabs. However, only one plug-on position is provided.

Aus der DE-A-21 54 566 ist eine Metall-Kochplatte bekannt, die an der Unterseite ihrer unbeheizten Mittelzone einen dort fest angebrachten Federbügel aufweist, der ein zwischen ihn und den Kochplattenkörper eingestecktes, einen Temperaturregler tragendes Wärmeübertragungselement an den Kochplattenkörper anpreßt. Das Aufstecken erleichtert die Anbringung des Wärmeübertragungselementes, erfordert aber ein zusätzliches, an der Kochplatte anzubringendes Teil und ermöglicht auch nur eine Aufsteckposition.From DE-A-21 54 566 a metal hotplate is known which has a spring clip fixed there on the underside of its unheated central zone, which presses a heat transfer element, which is inserted between it and the hotplate body and carries a temperature controller, onto the hotplate body. The plug-on facilitates the attachment of the heat transfer element, but requires an additional part to be attached to the hotplate and also only allows a plug-on position.

Aufgabe der Erfindung ist es, ein Strahlungs-Heizelement zu schaffen, bei dem der Temperaturfühler bei guter Anpassbarkeit an wechselnde Gegebenheiten beim Einbau ohne wesentliche Beeinträchtigung der gleichmäßigen Beheizung sowohl an die Beheizung der Strahlungs-Heizelemente als auch an die Temperatur der Glaskeramikplatte gekoppelt ist.The object of the invention is to provide a radiant heating element in which the temperature sensor is coupled to the heating of the radiant heating elements and to the temperature of the glass ceramic plate with good adaptability to changing conditions during installation without significantly affecting the uniform heating.

Diese Aufgabe wird gemäß der Erfindung durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.This object is achieved according to the invention by the characterizing features of claim 1.

Vorzugsweise kann das Wärmeübertragungselement die Form einer im wesentlichen flachen Platte aus einem gut wärmeleitenden Blech haben. Durch die Erfindung ist es also möglich, den Temperaturfühler außerhalb des vorzugsweise kreisrunden Beheizungsbereiches des Heizelementes anzuordnen und trotzdem die Temperatur im Randbereich des Heizelementes selbst, d. h. auch in dem vom Kochgefäß eingenommenen Bereich abzufühlen. Das Wärmeübertragungselement liegt dabei zumindest teilweise an der Unterseite der Glaskeramikplatte mit Wärmekontakt an, so daß es sowohl von oben als auch von unten von Wärme beaufschlagt wird. Durch Wahl seiner Form, die vorzugsweise im Umfangsrichtung langestreckt ist und seiner Dicke kann der Betrag der Wärmeleitung zum außen angeordneten Fühler bestimmt werden. Trotz der Abfühlung im Umfangsbereich wird an dieser Stelle nur eine relativ geringe Wärmemenge nach außen zum Fühler abgeführt, während der Hauptteil nach oben durch die Glaskeramikplatte hindurch in das Kochgefäß geleitet wird. Es entsteht also kein " kalter Fleck », so daß die vorstehend beschriebenen Nachteile nicht vorliegen.The heat transfer element can preferably have the shape of an essentially flat plate made of a highly heat-conducting sheet. The invention therefore makes it possible to arrange the temperature sensor outside the preferably circular heating area of the heating element and still to sense the temperature in the edge area of the heating element itself, ie also in the area occupied by the cooking vessel. The heat transfer element lies at least partially on the underside of the glass ceramic plate with thermal contact, so that heat is applied to it both from above and from below. By choosing its shape, which is preferably elongated in the circumferential direction and its thickness, the amount of heat conduction to the sensor arranged outside can be determined. Despite the sensation in the peripheral area, only a relatively small amount of heat is dissipated to the outside of the sensor at this point, while the main part is directed upwards through the glass ceramic plate the cooking vessel is directed. There is therefore no " cold spot", so that the disadvantages described above do not exist.

Das Wärmeübertragungselement, das den Fühler trägt, ist zwischen dem Rand des Heizelementes und der Glaskeramikplatte eingelegt und dort festgeklemmt. Der Fühler ist einfach an das Heizelement angesteckt, so daß er an einem beliebigen Heizelement und vor allem auch an beliebiger Stelle seines Umfanges angebracht werden kann. Dadurch wird eine besonders gute Anpassung an wechselnde Gegebenheiten beim Einbau ermöglicht.The heat transfer element that carries the sensor is inserted between the edge of the heating element and the glass ceramic plate and clamped there. The sensor is simply plugged into the heating element, so that it can be attached to any heating element and above all at any point on its circumference. This enables particularly good adaptation to changing conditions during installation.

Weitere Vorteile der Erfindung gehen aus der Beschreibung im Zusammenhang mit der Zeichnung hervor. Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher erläutert. Es zeigen :

  • Figur 1 einen Längsschnitt durch ein unterhalb einer Glaskeramikplatte angeordnetes Heizelement mit angebrachtem Temperaturfühler,
  • Figur 2 eine Draufsicht auf das Heizelement (ohne Glaskeramikplatte) und
  • Figur 3 ein vergrößertes Detail, nach der Linie III-III in Fig. 2 geschnitten.
Further advantages of the invention emerge from 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 shows a longitudinal section through a heating element arranged below a glass ceramic plate with a temperature sensor attached,
  • Figure 2 is a plan view of the heating element (without glass ceramic plate) and
  • Figure 3 shows an enlarged detail, cut along the line III-III in Fig. 2.

Fig. 1 zeigt ein Heizelement 11, das aus einer flachen, oben offenen Blechschale 17 besteht, in der eine ebenfalls schalenförmige Isolierung 12 angeordnet ist, in der in spiralförmigen Nuten elektrische. Heizwiderstände 13 in Form von Wendeln mit flach-ovaler Grundform liegen. Die Heizelemente werden in nicht dargestellter Weise von unten her federnd an eine Glaskeramikplatte 14 angedrückt und bilden so die Beheizung einer Kocheinheit. Jedes Heizelement beheizt eine Kochstelle, und zwar aufgrund des Abstandes zwischen den Heizwiderständen 13 und der Glaskeramikplatte (Raum 15 in der Ausnehmung der Isolierung) überwiegend durch Strahlung.Fig. 1 shows a heating element 11, which consists of a flat, open sheet metal shell 17, in which a likewise cup-shaped insulation 12 is arranged, in the electrical in spiral grooves. Heating resistors 13 are in the form of coils with a flat oval basic shape. The heating elements are pressed in a manner not shown resiliently from below onto a glass ceramic plate 14 and thus form the heating of a cooking unit. Each heating element heats a hotplate, specifically because of the distance between the heating resistors 13 and the glass ceramic plate (space 15 in the recess in the insulation) by radiation.

Die Isolierung 12 besitzt einen hochstehenden Rand 16, dessen Oberseite etwas über die obere Kante der sie aufnehmenden Blechschale 17 übersteht und der somit zur Anlage an der Unterseite der Glaskeramik bestimmt ist. Zwischen den Rand 16 und die Glaskeramikplatte 14 ist ein Wärmeübertragungselement 18 eingelegt, das aus einer im wesentlichen flachen Platte aus einem gut wärmeleitenden Blech, beispielsweise Messing- oder Kupferblech, hergestellt ist. Seine Form ist aus Fig. 2 zu erkennen. In der Draufsicht ist die Grundform im wesentlichen T-förmig. Der T-Balken bildet einen in Umfangsrichtung des im wesentlichen kreisförmigen Heizelementes an dessen Rand liegenden langgestreckten Bereich 19, der etwa linsenförmig ist und einen ebenfalls linsenförmigen Bereich 20 aufweist, der vom Rand 16 aus nach innen in den beheizten Raum 15 hineinragt und dabei im Randbereich einige Heizwiderstände 13 teilweise überdeckt. Der übrige Teil des Bereiches 19 liegt zwischen dem Rand 16 und der Glaskeramikplatte 14.The insulation 12 has a raised edge 16, the upper side of which protrudes somewhat above the upper edge of the sheet metal shell 17 receiving it, and which is thus intended to rest on the underside of the glass ceramic. Between the edge 16 and the glass ceramic plate 14, a heat transfer element 18 is inserted, which is made from a substantially flat plate made of a highly heat-conducting sheet, for example brass or copper sheet. Its shape can be seen from Fig. 2. In plan view, the basic shape is essentially T-shaped. The T-bar forms an elongated region 19 lying in the circumferential direction of the essentially circular heating element at its edge, which is approximately lenticular and also has a lenticular region 20 which protrudes inwards from the edge 16 into the heated space 15 and thereby in the edge region some heating resistors 13 partially covered. The remaining part of the area 19 lies between the edge 16 and the glass ceramic plate 14.

An dem vom Heizelement 11 nach außen weisenden Rand 21 des Bereiches 19 sind federnde Befestigungslappen 22 vorgesehen, die eine Festklemmung des Wärmeübertragungselementes 18 auf dem Rand der Blechschale 17 ermöglichen. An zwei relativ weit voneinander entfernten Umfangsabschnitten des Randes 21 sind dazu jeweils zwei nach unten gerichtete Abwinklungen 23 vorgesehen, die in den Spalt zwischen dem Rand 16 und der Blechschale 17 eingesteckt werden können. Ebenfalls aus dem Blechmaterial des Wärmeübertragungselementes abgebogen ist der federnde Befestigungslappen 22, der zwischen den beiden Abwinklungen 23 liegt und von außen auf die Blechschale 17 drückt. Durch diese Aufsteckbefestigung und die Festlegung zwischen dem Rand 16 der Isolierung 12 und der Glaskeramikplatte 14 ist das Wärmeübertragungselement somit in engem Kontakt zur Glaskeramikplatte festgelegt.On the edge 21 of the area 19 facing outward from the heating element 11, resilient fastening tabs 22 are provided, which enable the heat transfer element 18 to be clamped on the edge of the sheet metal shell 17. For this purpose, two downward angled portions 23 are provided on two relatively distant circumferential sections of the edge 21, which can be inserted into the gap between the edge 16 and the sheet metal shell 17. The resilient fastening tab 22, which lies between the two bends 23 and presses onto the sheet metal shell 17 from the outside, is also bent from the sheet material of the heat transfer element. By this attachment and the fixing between the edge 16 of the insulation 12 and the glass ceramic plate 14, the heat transfer element is thus fixed in close contact with the glass ceramic plate.

Von dem Bereich 19 des Wärmeübertragungselementes 18 ragt ein Außenabschnitt 24 nach außen über den Rand des Heizelementes hinaus.An outer section 24 projects outward from the area 19 of the heat transfer element 18 beyond the edge of the heating element.

Er ist einstückig mit dem Bereich 19 ausgebildet, zu diesem im wesentlichen parallel, jedoch durch eine Abbiegung 25 etwas nach unten versetzt, so daß der Außenabschnitt 24 nicht an der Unterseite der Glaskeramikplatte anliegt. Er ist beim vorliegenden Beispiel ausgeprägt, um eine nach unten weisende kreisringförmige Wärmeübertragungsfläche 27 zu bilden, an die eine Fühlerdose 28 von unten her angedrückt ist.It is formed in one piece with the area 19, essentially parallel to it, but offset somewhat downward by a bend 25, so that the outer section 24 does not abut the underside of the glass ceramic plate. In the present example, it is pronounced in order to form a downward-pointing, annular heat transfer surface 27, against which a sensor socket 28 is pressed from below.

Die Fühlerdose 28 ist eine mit einer Ausdehnungsflüssigkeit gefüllte Fühlerdose, die über ein Kapillarrohr 29 mit einem nicht dargestellten Temperaturregler verbunden ist, der die Beheizung des Heizelementes regelt.The sensor socket 28 is a sensor socket filled with an expansion liquid, which is connected via a capillary tube 29 to a temperature regulator, not shown, which regulates the heating of the heating element.

Die Fühlerdose 28 wird durch eine Druckfeder 30 an die Wärmeübertragungsfläche 27 angedrückt, die sich an einem die Fühlerdose führenden, an.dem Außenabschnitt des Warmeübertragungselementes angebrachten Haltemechanismus 31 abstützt. Bei der Anordnung von Fühlerdose und Haltemechanismus kann es sich um Anordnungen nach den deutschen Patenten 15 65 512 oder 24 22 687 handeln. Es sind jedoch auch andere Fühlerarten und -anbringungen möglich. So kann beispielsweise auch ein elektrischer NTC- oder PTC- Fühler verwendet werden, der federnd angedrückt wird oder fest an dem Außenabschnitt 24 angebracht ist. Die Gestaltung des Außenabschnittes ist völlig frei gestellt. Dadurch kann auch die Fühleranordnung beliebig gewählt werden. Es ist beispielsweise auch möglich, den Außenabschnitt um 90° gegenüber dem beheizten Abschnitt 19 abzuwinkeln und den Fühler von der Seite her anzusetzen. Dadurch könnte u. U. die Baugröße geringer gehalten werden.The sensor can 28 is pressed by a compression spring 30 against the heat transfer surface 27, which is supported on a holding mechanism 31 which guides the sensor can and is attached to the outer section of the heat transfer element. The arrangement of the sensor socket and the holding mechanism can be arrangements according to German patents 15 65 512 or 24 22 687. However, other sensor types and attachments are also possible. For example, an electrical NTC or PTC sensor can also be used, which is pressed on resiliently or is fixedly attached to the outer section 24. The design of the outer section is completely free. As a result, the sensor arrangement can also be chosen arbitrarily. For example, it is also possible to bend the outer section 90 ° with respect to the heated section 19 and to position the sensor from the side. This could U. the size can be kept smaller.

Die Temperaturfühleinrichtung 32, die aus dem Wärmeübertragungselement 18 und dem Temperaturfühler 28 gebildet wird, ist leicht an dem Heizelement 11 anzubringen, indem es durch die beiden relativ weit auseinanderliegenden Aufsteckbefestigungen 22, 23 befestigt und schließlich durch Einklemmen zwischen dem Rand und der Glaskeramikplatte festgehalten wird. Die Aufsteckung kann an einer beliebigen Stelle des Umfangs erfolgen, so daß die Lage den Einbaubedürfnissen angepaßt werden kann. Die Anbringung ist weder auf eine bestimmte Art noch Größe von Heizelementen beschränkt. Die gleiche Temperaturfühleinrichtung kann an Heizelementen unterschiedlichen Durchmessers angebracht werden. Die Heizwiderstände können in einfacher Weise angeordnet werden und brauchen nicht mehr um den Fühlerbereich herum abgelenkt zu werden.The temperature sensing device 32, which is formed from the heat transfer element 18 and the temperature sensor 28, is easy to attach to the heating element 11 by fastening it through the two relatively widely spaced push-on fasteners 22, 23 and finally holding it by clamping it between the edge and the glass ceramic plate. The attachment can be made at any point on the circumference, so that the situation Installation needs can be adapted. The attachment is not limited to a specific type or size of heating elements. The same temperature sensing device can be attached to heating elements of different diameters. The heating resistors can be arranged in a simple manner and no longer need to be deflected around the sensor area.

Die Größe und die Form des Innenabschnittes 20 hängt von verschiedenen Faktoren ab. Dies sind einerseits der Abstand der Heizwiderstände von der Glaskeramikplatte, deren Leistung, der erwünschte Zugriff des Temperaturreglers, die Dicke des Wärmeübertragungselementes und Größe und Intensität des Kontaktes zwischen Wärmeübertragungselement und Glaskeramikplatte. Ein guter Kontakt ist hier vorteilhaft, jedoch nicht über die ganze Fläche erforderlich. Bei einem üblichen Strahlungs-Heizelement könnte beispielsweise das Wärmeübertragungselement 18 aus einem Messingblech von 0,5 mm Dicke bestehen, das in Umfangsrichtung des Heizelementes Abmessungen von 80 bis 90 mm hat und dessen maximale Eindringtiefe T (siehe Fig. 2) in dem beheizten Bereich 20 bis 25 mm beträgt. Die Erfindung schafft den Vorteil, daß die dem Temperaturfühler zugeführte Wärme ohne die Notwendigkeit, dan Temperaturfühler selbst im Beheizten Bereich anzuordnen, nach außen geleitet wird, wo der Temperaturfühler an sich in einer kälteren Umgebung liegt und nur ganz definiert die Wärme erhält. Durch Ändern der Kontaktierung (bzw. Zwischenlegung von Isolationen) zur Glaskeramikplatte kann entweder nur die reine Heizungswärme oder eine Mischung aus dieser und einem starken, von der Glaskeramikplatte stammenden Anteil abgefühlt werden. Der Temperaturfühler kann auch im Zusammenhang mit einem üblichen, beispielsweise aus einem stabförmigen, quer über die Heizfläche angeordneten Temperaturfühler bestehenden Schutzglied gegen Überhitzung der Glaskeramikplatte benutzt werden.The size and shape of the inner portion 20 depends on various factors. These are, on the one hand, the distance of the heating resistors from the glass ceramic plate, their performance, the desired access by the temperature controller, the thickness of the heat transfer element and the size and intensity of the contact between the heat transfer element and the glass ceramic plate. Good contact is advantageous here, but is not required over the entire area. In the case of a conventional radiant heating element, for example, the heat transfer element 18 could consist of a brass sheet 0.5 mm thick, which has dimensions of 80 to 90 mm in the circumferential direction of the heating element and whose maximum penetration depth T (see FIG. 2) in the heated area 20 is up to 25 mm. The invention provides the advantage that the heat supplied to the temperature sensor is conducted to the outside without the need to arrange the temperature sensor itself in the heated area, where the temperature sensor is in a colder environment and only receives the heat in a very defined manner. By changing the contact (or interposing insulation) to the glass ceramic plate, either only the pure heating heat or a mixture of this and a strong portion originating from the glass ceramic plate can be sensed. The temperature sensor can also be used in connection with a conventional protection element, for example consisting of a rod-shaped temperature sensor arranged transversely over the heating surface, against overheating of the glass ceramic plate.

Um eine Krümmung des Wärmeübertragungselementes im beheizten Innenabschnitt 20 zu vermeiden, können dort Versteifungsrippen bzw. -sicken vorgesehen sein, die radial und axial, sich kreuzend verlaufen. Als Material kann für das Wärmeübertragungselement auch aluminiumplattiertes Stahlblech verwendet werden. Die Oberfläche im beheizten Innenabschnitt 20 kann mit einem mattschwarzen, d. h. in Bezug auf Strahlungswärme schwarz wirkenden, hitzebeständigen Lack beschichtet sein, um die Aufnahme von Strahlungswärme zu verbessern und zu vergleichmäßigen.In order to avoid a curvature of the heat transfer element in the heated inner section 20, stiffening ribs or beads can be provided there, which run radially and axially, crossing one another. Aluminum-plated steel sheet can also be used as the material for the heat transfer element. The surface in the heated inner section 20 can be coated with a matt black, i.e. H. black-coated, heat-resistant lacquer in relation to radiant heat, in order to improve and equalize the absorption of radiant heat.

Claims (6)

1. Radiant heating element for a cooking unit with a cooking surface (14), particularly made from a glass ceramic material, heating taking place by means of radiant heating resistors (13), arranged in an insulation (12) supported by a support shell (17), with a temperature sensor (28) for a control device arranged outside the heating element in the edge area thereof, and a heat transfer element (18) in thermal contact with the temperature sensor (28) which under areal contact engages on the bottom of the cooking surface (14), extends between the cooking surface (14) and the edge (16) of the insulation (12) adjacent thereto, and the outer portion (24) of which being spaced from the cooking surface (14) characterized in that the heat transfer element (18) has an inner portion (20), projecting from the outside into the heated area of heating element (11), being spaced from heating resistors (13) and engages on cooking surface (14) also in the radiant-heated area and covers the outer heating resistors (13) on part of their circumference, and in that the heat transfer element (18) has a plug- on fastening (22, 23) comprising two fastening lugs (22) peripherally spaced from one another on the periphery at the heating element (11) and which can be mounted from above on the edge of the support shell (17).
2. Heating element according to claim 1, characterized in that the inner portion (20) is peripherally elongated.
3. Heating element according to claim 2, characterized in that the inner portion (20) is lenticular with a peripherally directed longitudinal elongation.
4. Heating element according to one of the preceding claims, characterized in that a mounting support (31) for the resilient pressing of the temperature sensor (28) is provided on the bottom of outer portion (24).
5. Heating element according to one of the preceding claims, characterized in that the heat transfer element (18) has a generally T-shaped configuration, whose T-bar in part forms the inner portion (20), can be clamped with another part between edge (16) of the insulation (12) and cooking surface (14) and on whose outwardly directed edge (21) is provided the plug-on-fastening (22, 23) and whose central member forms the outer portion (24).
6. Heating element according to one of the preceding claims, characterized in that the inner portion (20) of the heat transfer element (18), optionally reinforced by ribs, is provided with a thermally black-acting coating.
EP80103010A 1979-06-13 1980-05-30 Radiant heating element for a cooking unit equipped with temperature sensor Expired EP0021107B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80103010T ATE2925T1 (en) 1979-06-13 1980-05-30 HEATING ELEMENT FOR A COOKING UNIT WITH A TEMPERATURE SENSOR.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2923884 1979-06-13
DE2923884A DE2923884C2 (en) 1979-06-13 1979-06-13 Control device for coupling to heating elements for glass ceramic cooking surfaces

Publications (3)

Publication Number Publication Date
EP0021107A1 EP0021107A1 (en) 1981-01-07
EP0021107B1 EP0021107B1 (en) 1983-03-30
EP0021107B2 true EP0021107B2 (en) 1987-01-21

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ID=6073117

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EP80103010A Expired EP0021107B2 (en) 1979-06-13 1980-05-30 Radiant heating element for a cooking unit equipped with temperature sensor

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Country Link
EP (1) EP0021107B2 (en)
JP (1) JPS563023A (en)
AT (1) ATE2925T1 (en)
DE (2) DE2923884C2 (en)
ES (1) ES492355A0 (en)
ZA (1) ZA803491B (en)

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Also Published As

Publication number Publication date
ES8102450A1 (en) 1980-12-16
ATE2925T1 (en) 1983-04-15
ZA803491B (en) 1981-06-24
EP0021107B1 (en) 1983-03-30
DE2923884C2 (en) 1982-12-02
JPS563023A (en) 1981-01-13
ES492355A0 (en) 1980-12-16
DE2923884A1 (en) 1980-12-18
DE3062515D1 (en) 1983-05-05
EP0021107A1 (en) 1981-01-07

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