EP0324086A1 - Heating device, especially as a cooking plate - Google Patents

Heating device, especially as a cooking plate Download PDF

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Publication number
EP0324086A1
EP0324086A1 EP88119571A EP88119571A EP0324086A1 EP 0324086 A1 EP0324086 A1 EP 0324086A1 EP 88119571 A EP88119571 A EP 88119571A EP 88119571 A EP88119571 A EP 88119571A EP 0324086 A1 EP0324086 A1 EP 0324086A1
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EP
European Patent Office
Prior art keywords
meanders
carrier plate
center
heating
towards
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP88119571A
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German (de)
French (fr)
Inventor
Klaus Meywald
Helmut Ohnmacht
Jens Dr. Bauchert
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.)
Eichenauer Heizelemente GmbH and Co KG
Original Assignee
Fritz Eichenauer GmbH and Co KG
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Publication date
Application filed by Fritz Eichenauer GmbH and Co KG filed Critical Fritz Eichenauer GmbH and Co KG
Publication of EP0324086A1 publication Critical patent/EP0324086A1/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater

Definitions

  • the invention relates to a heating device, in particular as a hotplate, with a carrier plate, such as made of aluminum silicate or the like, essentially lying on the heating conductors lying thereon and a cover, such as made of glass ceramic.
  • DE-OS 23 39 768 describes a generic device in which a glass ceramic plate is arranged above and at a distance from the electrical heating element and the electrical heating element is placed on a base layer made of electrically and thermally insulating material, the base layer having a flat top side and the heating element consists of a helical, uncovered heating conductor, which in turn is attached to the base layer only by metal clips.
  • the European patent application 82 10 5607.4 shows devices in which layers of resistance material are printed or evaporated on the underside of a covering glass ceramic plate. In the past, hot plates were provided with flat-pressed tubular heaters with metal jackets.
  • the heating coil radiates freely, so that the energy is emitted as radiant heat to the object to be heated without major losses.
  • the stability of the helix decreases and that mutual contact between adjacent heating conductor sections is not excluded.
  • the size of the probability of a short circuit increases with an increase in the power concentration on the cover plate, so that only a small amount of power can be installed when designed in the form of a spiral.
  • Another disadvantage arises from the fact that, in the spiral-shaped design of the heating conductor, which is shaped like a helix, an undesirable area-specific increase in power takes place in the center during operation of the hotplate.
  • the invention is therefore based on the object of creating a generic heating device in which, while avoiding the disadvantages mentioned, not only a higher heating output can be achieved, but in particular a desired area-specific power assignment, this being at least the same in the outside area as further inside, but preferably on the Periphery should be larger.
  • the object of the invention is achieved according to the invention in a generic device in that the heating conductor is guided in meanders, that legs of the meanders are directed essentially towards a common center, that subgroups of the meanders are guided differently close to the center; and that inner deflection areas of the meanders lie in different planes perpendicular to the axis.
  • a meander is understood here to mean a wire region with a deflection point which essentially reverses the running direction of the wire and two legs or leg sections of the wire extending therefrom. It is essential that wire sections do not overlap, that is, the wire in particular is not coiled and therefore no wire areas are covered by an insulating core, since this would shield the heat of a wire area located below it.
  • a carrier plate may consist of pressed aluminum silicate and possibly provided with an additional binder. It can preferably lie in a shell made of metal, preferably steel, which is adapted to its outer contour.
  • the outer contour of the heating conductor is preferably in All versions of conventional pots are circular or ring-shaped, but can also have other contours, such as oval, square or rectangular.
  • deflection areas of the meanders are fixed, for example by means of cramps or adhesive connections.
  • inner deflection points are defined, while the outer deflection points are not fixed, but instead can expand further outwards in the event of longitudinal expansion due to the heating, so that a certain expansion area for the outer deflection areas should also be provided in the carrier plate.
  • the carrier plate in a ring area has bumps extending essentially towards the center between legs of turns. This results in protection of adjacent legs of a meander against touch.
  • the carrier plate has wedge-shaped, recessed recesses towards the center, in which meanders lie, so that the legs of meanders, preferably short meanders, can lie in these recesses.
  • cover plates made of insulating material, on which there is a glass-ceramic plate and which rest on the carrier plate overlap the helix tips and thus prevent a securing against the lifting of helix tips against the glass-ceramic plate, which may be present.
  • the configuration according to the invention ensures that a very high electrical output can be installed without the risk of mutual contact between individual heating conductor sections.
  • the configuration according to the invention not only results in a relatively high electrical power density, but in particular the setting of a desired power density which increases towards the outside is possible.
  • the energy supplied to the heating conductor can be used immediately as Radiant heat can be used.
  • the hotplate of FIG. 1 has a carrier plate 2 made of pressed aluminum silicate, optionally bound by a suitable binder.
  • the heating device 1 has a circular outer contour.
  • a heating conductor strip placed on the carrier plate 2 is guided in a helical manner such that the legs of the coil point radially towards the center of the carrier plate 2.
  • the deflection points of the individual coils 4, 5 of the heating conductor strip 3 lie on a common circumference.
  • the heating conductor strip 3, however, has long and short meanders or meandering windings 5, 4, which alternately follow one another.
  • the long meanders protrude radially inwards than the short ones.
  • Two legs, which together with a deflection point 5 of their direction course form a meander, lie immediately adjacent to one another. Between two legs one far behind Long meander 5 projecting on the inside has the carrier plate 2 elongated, radially directed bumps, by means of which the legs 6, 7 of the long meander 4 are kept at a distance from one
  • the carrier plate 2 is not completely flat, but has profiles in the radial direction in the vertical section.
  • the carrier plate initially has an essentially planar surface 21 from the outer circumference to the inside, to which a recess 22 adjoins via a shoulder 22 and leads downward in a wedge shape from the outside.
  • a shoulder 23 a horizontal plane parallel to the surface 21, but offset downwards to this lying plane 24, which in turn is followed by an inner surface 27 via a shoulder 26, which is also horizontal and in the plane of the surface 21.
  • the surface 27 is the central circular surface in the central region of the support body 2.
  • the surfaces 24, 26 are the ring surfaces surrounding them.
  • the surface 21 is also an annular surface, while the recesses 9 are not closed in a ring, but rather the elongated, essentially radially oriented bumps 8, which keep the legs 6, 7 of the long windings 4 at a distance, are arranged between them.
  • the inner deflection area of the long meander 4 lies on the plane 24 and the meander 4 is thus essentially horizontal and extends parallel to the planes of the surfaces 21, 27.
  • the short turns 5, do not extend as far radially inwards as the windings 4, are bent downwards relative to the plane defined above and lie in the recess 9 leading downwards in a wedge shape. This prevents the (inner) deflection regions of the short windings 5 from adjoining legs 6, 7 touch turns 4 reaching further inwards.
  • an insulating disk made of a suitable material, for example also aluminum silicate or put on Klimmer or the like, which extends radially a short distance above the surface 27 and ends above the inner deflection region of the turn 4.
  • an insulating ring 15 is placed on the outer ring surface 21, which projects radially inward over the surface 21 and covers the outer deflection points of the heating conductor 3. This provides additional security against the fact that the heating conductor moves upwards, for example due to internal stresses, bends upwards and touches the cover, such as a glass ceramic plate 16, lying on the insulating parts 14, 15.
  • the distance 17 between the plane of the heating conductor 3, 4 and the glass ceramic plate 16 can be adjusted by the thickness of the insulating washers 14, 15.
  • a trough 18 preferably made of steel, the contour of which is attached to the outer or lower contour of the support plate 2.
  • the inner deflection points 12, 12a of the meanders 4 and 5 are fixed, specifically in the configuration in FIG. 3 by means of staples 19 shot into the base plate 2 and in the configuration in FIG. 4 by means of adhesive points 20.
  • the deflection regions 12, 12a of both legs cannot be fastened in this way; Such a fastening is advisable, in particular, for the short legs 5 in order to reliably rule out that the inner deflection points 12a move upward into the area of the meanders 4 and can touch them.

Abstract

The invention proposes a heating device, especially as a cooking plate, having a supporting plate (consisting for example of aluminium silicate or the like), heating conductors (located essentially on the supporting plate) and a cover (consisting for example of glass ceramic), in which heating device, in order to increase the heating power and especially in order to facilitate a desired surface-specific power improvement, it is provided that the heating conductor is guided in a meandering form, that limbs of the meander are essentially directed onto a common centre, that partial groups of the meander are guided at different distances from the centre and that inner reversing regions of the meander are located in different planes having perpendicular axes. <IMAGE>

Description

Die Erfindung betrifft eine Heizvorrichtung, insbesondere als Kochplatte, mit einer Trägerplatte, wie aus Aluminium-Silikat oder dergleichen, im wesentlichen auf dieser aufliegenden Heiz­leitern und einer Abdeckung, wie aus Glaskeramik.The invention relates to a heating device, in particular as a hotplate, with a carrier plate, such as made of aluminum silicate or the like, essentially lying on the heating conductors lying thereon and a cover, such as made of glass ceramic.

In der DE-OS 23 39 768 ist eine gattungsgemäße Vorrichtung beschrieben, bei der eine Glaskeramikplatte oberhalb und mit Abstand zum elektrischen Heizelement angeordnet ist und das elektrische Heizelement auf einer Grundschicht aus elektrisch und thermisch isolierendem Werkstoff aufgelegt ist, wobei die Grundschicht eine ebene Oberseite hat und das Heizelement aus einem schraublinienförmig gewendelten unbedeckten Heizleiter besteht, der wiederum auf der Grundschicht nur durch Metall­klammern befestigt ist. Die europäische Patentanmeldung 82 10 5607.4 zeigt Vorrichtungen, bei denen auf der Unterseite einer abdeckenden Glaskeramikplatte Schichten aus Widerstands­material aufgedruckt oder aufgedampft sind. Kochplatten wurden weiterhin früher mit flachgepreßten Rohrheizkörpern mit Metall­mänteln versehen.DE-OS 23 39 768 describes a generic device in which a glass ceramic plate is arranged above and at a distance from the electrical heating element and the electrical heating element is placed on a base layer made of electrically and thermally insulating material, the base layer having a flat top side and the heating element consists of a helical, uncovered heating conductor, which in turn is attached to the base layer only by metal clips. The European patent application 82 10 5607.4 shows devices in which layers of resistance material are printed or evaporated on the underside of a covering glass ceramic plate. In the past, hot plates were provided with flat-pressed tubular heaters with metal jackets.

Beim Gegenstand der DE-OS 23 39 768 strahlt die Heizspirale frei ab, so daß die Energie ohne größere Verluste als Strahlungs­wärme zum zu erwärmenden Gegenstand abgegeben wird. Es besteht jedoch die Gefahr, daß bei üblicherweise erreichbaren Tem­peraturen des Heizleiters in der Größenordnung von 950° C die Stabilität der Schraubwendel sich mindert und eine gegenseitige Berührung benachbarter Heizleiterabschnitte nicht ausgeschlossen ist. Insbesondere steigt die Größe der Wahrscheinlichkeit eines Kurzschlusses mit Erhöhung der Leistungskonzentration an der Abdeckplatte, so daß bei Auslegung in Spiralenform nur eine geringe Leistung installiert werden kann. Ein weiterer Nachteil ergibt sich dadurch, daß bei der spiralenförmigen Auslegung des insich schraublinienförmig geformten Heizleiters beim Betrieb der Kochplatte im Zentrum eine unerwünschte flächenspezifische Leistungserhöhung stattfindet. Da im Zentrum nur geringe Wärme­verluste stattfinden, diese aber am Rande gegeben sind, sollte im Zentrum keine flächenspezifisch höhere Leistung abgegeben werden als am Rande; es ist vielmehr wünschenswert, daß zur Abdeckung im Randbereich entstehender Verluste dort die spezi­fische Leistungsabgabe höher ist als im Zentrum einer entsprechen­den Heizvorrichtung. Die Leistung nach der Vorrichtung der europäischen Patentanmeldung 82 105607.4 ist sehr begrenzt, da die im Aufdampfungs- bzw. Druckverfahren aufgebrachte Schicht für den Heizleiter nicht beliebig groß gewählt werden kann. Ein weiterer Nachteil besteht darin, daß im Falle einer Heizwider­standsunterbrechung an einer von mehreren an einer Glaskeramik­platte vorgesehenen Kochflächen die gesamte Glaskeramikplatte ausgetauscht werden muß.In the subject of DE-OS 23 39 768, the heating coil radiates freely, so that the energy is emitted as radiant heat to the object to be heated without major losses. However, there is a risk that at temperatures of the heating conductor of around 950 ° C. which are usually achievable, the stability of the helix decreases and that mutual contact between adjacent heating conductor sections is not excluded. In particular, the size of the probability of a short circuit increases with an increase in the power concentration on the cover plate, so that only a small amount of power can be installed when designed in the form of a spiral. Another disadvantage arises from the fact that, in the spiral-shaped design of the heating conductor, which is shaped like a helix, an undesirable area-specific increase in power takes place in the center during operation of the hotplate. Since only slight heat losses take place in the center, but these are given on the edge, no area-specific higher output should be given in the center than on the edge; it is rather desirable that the specific power output is higher there to cover losses occurring in the edge region than in the center of a corresponding heating device. Performance according to the device of European patent application 82 105607.4 is very limited, since the layer applied in the vapor deposition or pressure process for the heat conductor cannot be chosen to be of any size. Another disadvantage is that in the event of an interruption in the heating resistance on one of several cooking surfaces provided on a glass ceramic plate, the entire glass ceramic plate must be replaced.

Der Erfindung liegt daher die Aufgabe zugrunde, eine gattungs­gemäße Heizvorrichtung zu schaffen, bei der unter Vermeidung der genannten Nachteile nicht nur eine höhere Heizleistung erreichbar ist, sondern insbesondere eine gewünschte flächen­spezifische Leistungsbelegung, wobei diese im Außenbereich zumindestens gleich wie weiter innen, vorzugsweise aber an der Peripherie größer sein soll.The invention is therefore based on the object of creating a generic heating device in which, while avoiding the disadvantages mentioned, not only a higher heating output can be achieved, but in particular a desired area-specific power assignment, this being at least the same in the outside area as further inside, but preferably on the Periphery should be larger.

Die der Erfindung zugrunde liegende Aufgabe wird erfindungs­gemäß bei einer gattungsgemäßen Vorrichtung dadurch gelöst, daß der Heizleiter in Mäandern geführt ist, daß Schenkel der Mäander im wesentlichen auf ein gemeinsames Zentrum gerichtet sind, daß Teilgruppen der Mäander unterschiedlich nahe zum Zentrum geführt sind; und daß innere Umlenkbereiche der Mäander in verschiedenen achssenkrechten Ebenen liegen. Unter einem Mäander wird hier ein Drahtbereich mit einer die Laufrichtung des Drahtes im wesentlichen bogenförmig umkehrenden Umlenkstelle und zwei von dieser ausgehenden Schenkeln oder Schenkelabschnitte des Drahtes verstanden. Wesentlich ist, daß Drahtabschnitte sich nicht überdecken, also der Draht insbesondere nicht in sich gewendelt ist und daher auch keine Drahtbereiche durch eine isolierende Seele abgedeckt sind, da diese die Wärme eines unter ihr befindlichen Drahtbereichs abschirmen würde.The object of the invention is achieved according to the invention in a generic device in that the heating conductor is guided in meanders, that legs of the meanders are directed essentially towards a common center, that subgroups of the meanders are guided differently close to the center; and that inner deflection areas of the meanders lie in different planes perpendicular to the axis. A meander is understood here to mean a wire region with a deflection point which essentially reverses the running direction of the wire and two legs or leg sections of the wire extending therefrom. It is essential that wire sections do not overlap, that is, the wire in particular is not coiled and therefore no wire areas are covered by an insulating core, since this would shield the heat of a wire area located below it.

Eine Trägerplatte besteht gegebenenfalls aus verpreßtem und eventuell mit zusätzlichem Bindemittel versehenem Aluminium-­Silikat. Sie kann in bevorzugter Weise in einer an ihrer Außen­kontur angepaßten Schale aus Metall, vorzugsweise Stahl, ein­liegen. Die Außenkontur des Heizleiters ist vorzugsweise in allen Fassungen üblicher Kochtöpfe kreis- oder ringförmig, kann aber auch andere Konturen aufweisen, wie beispielsweise oval, quadratisch oder rechteckig.A carrier plate may consist of pressed aluminum silicate and possibly provided with an additional binder. It can preferably lie in a shell made of metal, preferably steel, which is adapted to its outer contour. The outer contour of the heating conductor is preferably in All versions of conventional pots are circular or ring-shaped, but can also have other contours, such as oval, square or rectangular.

In weiterer bevorzugter Ausgestaltung kann vorgesehen sein, daß Umlenkbereiche der Mäander festgelegt sind, beispielsweise durch Krampen oder Klebverbindungen. Hierbei werden vorzugsweise innen­liegende Umlenkpunkte festgelegt, während die äußeren Umlenkpunkte nicht festgelegt werden, sondern sich bei Längendehnung aufgrund der Erhitzung frei weiter nach außen ausdehnen können, so daß hier in der Trägerplatte auch ein gewisser Ausdehnbereich für die außenliegenden Umlenkbereiche vorgesehen sein sollte.In a further preferred embodiment it can be provided that deflection areas of the meanders are fixed, for example by means of cramps or adhesive connections. In this case, preferably inner deflection points are defined, while the outer deflection points are not fixed, but instead can expand further outwards in the event of longitudinal expansion due to the heating, so that a certain expansion area for the outer deflection areas should also be provided in the carrier plate.

Eine Weiterbildung sieht vor, daß die Trägerplatte in einem Ringbereich sich im wesentlichen zum Zentrum hin erstreckende Höcker zwischen Schenkeln von Windungen aufweist. Hierdurch ergibt sich ein Schutz benachbarter Schenkel eines Mäanders gegen Berühren. In weiterer Ausbildung kann vorgesehen sein, daß die Trägerplatte zum Zentrum hin keilförmige, sich vertiefende Ausnehmungen aufweist, in denen Mäander einliegen, so daß die Schenkel von Mäandern, vorzugsweise von kurzen Mäandern in diesen Vertiefungen einliegen können. Weiterhin kann, insbe­sondere im Bereich der äußeren Umlenkpunkte vorgesehen sein, daß vorhandene, auf der Trägerplatte aufliegende Abdeckplatten aus Isoliermaterial, auf denen dann gegebenenfalls eine Glaskeramik­platte aufliegt, die Wendelspitzen übergreifen und damit eine Sicherung gegen ein Anheben von Wendelspitzen gegen die gegebenen­falls aufliegende Glaskeramikplatte verhindern.A further development provides that the carrier plate in a ring area has bumps extending essentially towards the center between legs of turns. This results in protection of adjacent legs of a meander against touch. In a further embodiment it can be provided that the carrier plate has wedge-shaped, recessed recesses towards the center, in which meanders lie, so that the legs of meanders, preferably short meanders, can lie in these recesses. Furthermore, it can be provided, in particular in the area of the outer deflection points, that cover plates made of insulating material, on which there is a glass-ceramic plate and which rest on the carrier plate, overlap the helix tips and thus prevent a securing against the lifting of helix tips against the glass-ceramic plate, which may be present.

Durch die erfindungsgemäße Ausgestaltung wird erreicht, daß eine sehr hohe elektrische Leistung installiert werden kann, ohne daß die Gefahr einer gegenseitigen Berührung von einzelnen Heizleiterabschnitten besteht. Durch die erfindungsgemäße Aus­gestaltung ergibt sich nicht nur eine relativ hohe elektrische Leistungsdichte, sondern insbesondere ist die Einstellung einer gewünschten nach außen hin zunehmenden Leistungsdichte möglich. Die dem Heizleiter zugeführte Energie kann unmittelbar als Strahlungswärme benutzt werden.The configuration according to the invention ensures that a very high electrical output can be installed without the risk of mutual contact between individual heating conductor sections. The configuration according to the invention not only results in a relatively high electrical power density, but in particular the setting of a desired power density which increases towards the outside is possible. The energy supplied to the heating conductor can be used immediately as Radiant heat can be used.

Weitere Vorteile und Merkmale der Erfindung ergeben sich aus den Ansprüchen und aus der nachfolgenden Beschreibung, in der Ausführungsbeispiele der Erfindung unter Bezugnahme auf die Zeichnung näher erläutert sind. Dabei zeigt:

  • Fig. 1 Eine Draufsicht auf Heizleiter und Trägerplatte einer bevorzugten Ausführungsform der erfindungs­gemäßen Heizvorrichtung;
  • Fig. 2 einen Schnitt entlang II-II der Figur 1;
  • Fig. 3 einen Schnitt entsprechend Figur 2 durch eine Ausführungsform, bei der die freien Wendelspitzen mittels Klammern an der Trägerplatte befestigt sind; und
  • Fig. 4 einen Schnitt entsprechend Figur 2 einer Ausge­staltung, bei der die Wendelspitzen mittels Kleb­stoff an der Trägerplatte festgelegt sind.
Further advantages and features of the invention result from the claims and from the following description in which exemplary embodiments of the invention are explained in more detail with reference to the drawing. It shows:
  • Fig. 1 is a plan view of the heating conductor and carrier plate of a preferred embodiment of the heating device according to the invention;
  • Figure 2 is a section along II-II of Figure 1;
  • 3 shows a section corresponding to FIG. 2 through an embodiment in which the free spiral tips are fastened to the carrier plate by means of clips; and
  • Fig. 4 shows a section corresponding to Figure 2 of an embodiment in which the spiral tips are fixed to the carrier plate by means of adhesive.

Die Kochplatte der Figur 1 weist eine Trägerplatte 2 aus ge­preßtem, gegebenenfalls durch einen geeigneten Binder zusätzlich gebundenem Aluminium-Silikat auf. Die Heizvorrichtung 1 weist eine kreisförmige Außenkontur auf. Ein auf die Trägerplatte 2 aufgelegtes Heizleiterband ist derart wendelförmig geführt, daß die Schenkel der Wendel radial zum Zentrum der Trägerplatte 2 hin weisen.Die Umlenkstellen der einzelnen Wendel 4, 5 des Heizleiterbandes 3 liegen auf einem gemeinsamen Kreisumfang. Das Heizleiterband 3 weist aber lange und kurze Mäander oder Mäanderwindungen 5, 4 auf, die abwechselnd aufeinander folgen. Die langen Mäander ragen radial weiter nach innen als die kurzen. Zwei Schenkel, die gemeinsam mit einer Umlenkstelle 5 ihres Richtungsverlaufs einen Mäander bilden, liegen unmittelbar be­nachbart nebeneinander. Zwischen zwei Schenkeln eines weit nach innen ragenden langen Mäanders 5 weist die Trägerplatte 2 längliche, radial gerichtete Höcker auf, durch die die Schenkel 6, 7 der langen Mäander 4 zueinander auf Abstand gehalten werden.The hotplate of FIG. 1 has a carrier plate 2 made of pressed aluminum silicate, optionally bound by a suitable binder. The heating device 1 has a circular outer contour. A heating conductor strip placed on the carrier plate 2 is guided in a helical manner such that the legs of the coil point radially towards the center of the carrier plate 2. The deflection points of the individual coils 4, 5 of the heating conductor strip 3 lie on a common circumference. The heating conductor strip 3, however, has long and short meanders or meandering windings 5, 4, which alternately follow one another. The long meanders protrude radially inwards than the short ones. Two legs, which together with a deflection point 5 of their direction course form a meander, lie immediately adjacent to one another. Between two legs one far behind Long meander 5 projecting on the inside has the carrier plate 2 elongated, radially directed bumps, by means of which the legs 6, 7 of the long meander 4 are kept at a distance from one another.

Wie den Figuren 2ff zu entnehmen ist, ist die Trägerplatte 2 nicht vollständig eben ausgebildet, sondern weist in radialer Richtung im senkrechten Schnitt Profilierungen auf. So weist die Trägerplatte im dargestellten Schnitt vom Außenumfang nach innen hin zunächst eine im wesentlichen ebene Oberfläche 21 auf, an der über eine Schulter 22 eine von außen keilförmig schräg nach unten führende Ausnehmung 9 anschließt. Dieser folgt wieder über eine Schulter 23 eine horizontale parallel zur Oberfläche 21, aber nach unten versetzt zu dieser liegende Ebene 24, der wiederum über eine Schulter 26 eine innere Oberfläche 27 folgt, die ebenfalls horizontal und in der Ebene der Oberfläche 21 liegt. Die Oberfläche 27 ist die zentrale Kreisfläche im Zentral­bereich des Tragkörpers 2. Die Flächen 24, 26 sind diese um­gebenden Ringflächen. Ebenfalls ist die Fläche 21 eine Ring­fläche, während die Ausnehmungen 9 nicht ringförmig geschlossen sind, sondern sich zwischen diesen insbesondere die die Schenkel 6, 7 der langen Windungen 4 auf Abstand haltenden länglichen, im wesentlichen radial ausgerichteten Höcker 8 angeordnet sind. Wie aus der Figur 2 ersichtlich ist, liegt der innere Umlenk­bereich des langen Mäanders 4 auf der Ebene 24 auf und der Mäander 4 damit im wesentlichen horizontal und erstreckt sich parallel zu den Ebenen der Flächen 21, 27. Demgegenüber sind die kurzen Windungen 5, die nicht soweit radial nach innen reichen wie die Windungen 4, gegenüber der vorstehend definierten Ebene nach unten abgeknickt und liegen in der von außen keilförmig schräg nach unten führenden Ausnehmung 9. Hierdurch wird ver­hindert, daß die (inneren) Umlenkbereiche der kurzen Windungen 5 die benachbarten Schenkel 6, 7 weiter nach innen reichende Windungen 4 berühren.As can be seen from FIGS. 2ff, the carrier plate 2 is not completely flat, but has profiles in the radial direction in the vertical section. Thus, in the section shown, the carrier plate initially has an essentially planar surface 21 from the outer circumference to the inside, to which a recess 22 adjoins via a shoulder 22 and leads downward in a wedge shape from the outside. This is followed again by a shoulder 23, a horizontal plane parallel to the surface 21, but offset downwards to this lying plane 24, which in turn is followed by an inner surface 27 via a shoulder 26, which is also horizontal and in the plane of the surface 21. The surface 27 is the central circular surface in the central region of the support body 2. The surfaces 24, 26 are the ring surfaces surrounding them. The surface 21 is also an annular surface, while the recesses 9 are not closed in a ring, but rather the elongated, essentially radially oriented bumps 8, which keep the legs 6, 7 of the long windings 4 at a distance, are arranged between them. As can be seen from FIG. 2, the inner deflection area of the long meander 4 lies on the plane 24 and the meander 4 is thus essentially horizontal and extends parallel to the planes of the surfaces 21, 27. In contrast, the short turns 5, do not extend as far radially inwards as the windings 4, are bent downwards relative to the plane defined above and lie in the recess 9 leading downwards in a wedge shape. This prevents the (inner) deflection regions of the short windings 5 from adjoining legs 6, 7 touch turns 4 reaching further inwards.

Auf der inneren Oberfläche 24 ist eine Isolierscheibe aus ge­eignetem Material, beispielsweise ebenfalls Aluminium-Silikat oder aber Klimmer oder dergleichen aufgelegt, die die Ober­fläche 27 radial um ein kurzes Stück überragt und oberhalb des inneren Umlenkbereichs der Windung 4 endet. In gleicher Weise ist auf der äußeren Ringfläche 21 ein Isolierring 15 aufgelegt, der die Fläche 21 radial nach innen überragt und die äußeren Umlenkpunkte des Heizleiters 3 überdeckt. Hierdurch ist eine zusätzliche Sicherheit dagegen gegeben, daß der Heiz­leiter sich nach oben bewegt, beispielsweise aufgrund innerer Spannungen nach oben krümmt und die auf den Isolierteilen 14, 15 aufliegende Abdeckung, wie eine Glaskeramikplatte 16, lokal berührt.Der Abstand 17 zwischen der Ebene des Heizleiters 3, 4 und der Glaskeramikplatte 16 kann durch die Dicke der Isolier­scheiben 14, 15 eingestellt werden.On the inner surface 24 there is an insulating disk made of a suitable material, for example also aluminum silicate or put on Klimmer or the like, which extends radially a short distance above the surface 27 and ends above the inner deflection region of the turn 4. In the same way, an insulating ring 15 is placed on the outer ring surface 21, which projects radially inward over the surface 21 and covers the outer deflection points of the heating conductor 3. This provides additional security against the fact that the heating conductor moves upwards, for example due to internal stresses, bends upwards and touches the cover, such as a glass ceramic plate 16, lying on the insulating parts 14, 15. The distance 17 between the plane of the heating conductor 3, 4 and the glass ceramic plate 16 can be adjusted by the thickness of the insulating washers 14, 15.

Die ganze bisher beschriebene Anordnung sitzt in einer Wanne 18, vorzugsweise aus Stahl, deren Kontur der Außen- bzw. unteren Kontur der Tragplatte 2 angebracht ist.The whole arrangement described so far sits in a trough 18, preferably made of steel, the contour of which is attached to the outer or lower contour of the support plate 2.

Bei den Ausgestaltungen der Figuren 3 und 4 sind die inneren Umlenkpunkte 12, 12a der Mäander 4 bzw. 5 festgelegt und zwar bei der Ausgestaltung der Figur 3 mittels in die Grundplatte 2 eingeschossener Krampen 19 und bei der Ausgestaltung der 4 mittels Klebpunkten 20. Es müssen nicht die Umlenkbereiche 12, 12a beider Schenkel derart befestigt sein; eine solche Befestigung ist aber insbesondere für die kurzen Schenkel 5 ratsam, um zuverlässig auszuschließen, daß die inneren Umlenkpunkte 12a sich nach oben in den Bereich der Mäander 4 bewegen und diese berühren können.In the configurations of FIGS. 3 and 4, the inner deflection points 12, 12a of the meanders 4 and 5 are fixed, specifically in the configuration in FIG. 3 by means of staples 19 shot into the base plate 2 and in the configuration in FIG. 4 by means of adhesive points 20. the deflection regions 12, 12a of both legs cannot be fastened in this way; Such a fastening is advisable, in particular, for the short legs 5 in order to reliably rule out that the inner deflection points 12a move upward into the area of the meanders 4 and can touch them.

Claims (11)

1. Heizvorrichtung, insbesondere als Kochplatte, mit einer Trägerplatte, wie aus Aluminium-Silikat oder dergleichen, im wesentlichen auf dieser aufliegenden Heizleitern und einer Abdeckung, wie aus Glaskeramik, dadurch gekennzeich­ net, daß der Heizleiter (3) in Mäandern geführt ist, daß Schenkel der Mäander (4, 5) im wesentlichen auf ein gemeinsames Zentrum gerichtet sind, daß Teilgruppen der Mäander (3, 4) unterschiedlich nahe zum Zentrum geführt sind; und daß innere Umlenkbereiche (12, 12a) der Mäander (4, 5) in verschiedenen achssenkrechten Ebenen liegen.1. Heating device, in particular as a hotplate, with a carrier plate, such as aluminum silicate or the like, essentially on this heat conductors and a cover, such as glass ceramic, characterized net that the heating conductor (3) is guided in meanders, that legs of the meanders (4, 5) are directed essentially towards a common center, that subgroups of the meanders (3, 4) are guided differently close to the center; and that inner deflection areas (12, 12a) of the meanders (4, 5) lie in different planes perpendicular to the axis. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Trägerplatte (2) in einem Ringbereich sich im wesent­lichen zum Zentrum hin erstreckende Höcker zwischen Schen­keln (6, 7) von Windungen (4) aufweist.2. Device according to claim 1, characterized in that the carrier plate (2) in a ring region extending substantially towards the center of the bumps between legs (6, 7) of turns (4). 3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Trägerplatte (2) zum Zentrum hin keilförmige, sich vertiefende Ausnehmungen (9) aufweist, in denen Mäander (5) einliegen.3. Apparatus according to claim 1 or 2, characterized in that the carrier plate (2) has wedge-shaped, deepening recesses (9) towards the center, in which meanders (5) lie. 4. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die am längsten ausgebildeten Mäander (4, 6, 7) im wesentlichen parallel zur Abdeckplatte (16) liegen.4. Device according to one of the preceding claims, characterized in that the longest meanders (4, 6, 7) are substantially parallel to the cover plate (16). 5. Vorrichtungen nach einem der vorangehenden Ansprüche, da­durch gekennzeichnet, daß Wendepunkte der Mäander (4, 5) befestigt sind.5. Devices according to one of the preceding claims, characterized in that turning points of the meanders (4, 5) are attached. 6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die Wendepunkte mit Krampen (19) an der Trägerplatte (2) festgelegt sind.6. The device according to claim 5, characterized in that the turning points are fixed with cramps (19) on the carrier plate (2). 7. Vorrichtung nach Anspruch 5 oder 6, dadurch gekennzeich­net, daß Wendepunkte (12, 12a) mittels Klebepunkten (20) an der Trägerplatte (2) festgelegt sind.7. Apparatus according to claim 5 or 6, characterized in that turning points (12, 12a) are fixed by means of adhesive points (20) on the carrier plate (2). 8. Vorrichtung nach einem der Ansprüche 6 bis 7, dadurch ge­kennzeichnet, daß zum Zentrum hin gerichtete unterhalb einer Ebene anderer Windungen (4) liegende Wendepunkte (12a) festgelegt sind.8. Device according to one of claims 6 to 7, characterized in that towards the center directed below a plane of other turns (4) lying turning points (12a) are set. 9. Vorrichtung nach einem der Ansprüche 6 bis 8, dadurch ge­kennzeichnet, daß sämtliche zum Zentrum hin gerichtete Wendepunkte (12, 12a) des Heizleiters (2) festgelegt sind.9. Device according to one of claims 6 to 8, characterized in that all turning points directed towards the center (12, 12a) of the heating conductor (2) are fixed. 10. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß auf der Trägerplatte (2) Isolierschei­ben aufliegen.10. Device according to one of the preceding claims, characterized in that insulating disks rest on the carrier plate (2). 11. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, daß die Isolierscheiben (14, 15) die ihnen benachbarten Wende­punkte (12) der Mäander (4) übergreifen.11. The device according to claim 10, characterized in that the insulating washers (14, 15) overlap the adjacent turning points (12) of the meanders (4).
EP88119571A 1988-01-13 1988-11-24 Heating device, especially as a cooking plate Withdrawn EP0324086A1 (en)

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DE19883800676 DE3800676A1 (en) 1988-01-13 1988-01-13 HEATING DEVICE, ESPECIALLY AS A HOTPLATE
DE3800676 1988-01-13

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EP0463334A3 (en) * 1990-06-22 1992-08-26 E.G.O. Elektro-Geraete Blanc U. Fischer Process and device for fixing heating resistances to a support
DE19638640A1 (en) * 1996-09-21 1998-04-02 Ako Werke Gmbh & Co Radiant heater with a metal foil heating conductor
DE19638640C2 (en) * 1996-09-21 2000-11-30 Diehl Ako Stiftung Gmbh & Co Radiant heater with a metal foil heating conductor

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