EP0093273B1 - Radiation unit for a range or the like - Google Patents

Radiation unit for a range or the like Download PDF

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Publication number
EP0093273B1
EP0093273B1 EP83103415A EP83103415A EP0093273B1 EP 0093273 B1 EP0093273 B1 EP 0093273B1 EP 83103415 A EP83103415 A EP 83103415A EP 83103415 A EP83103415 A EP 83103415A EP 0093273 B1 EP0093273 B1 EP 0093273B1
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EP
European Patent Office
Prior art keywords
heating coil
heater
coiled
filament
radiant unit
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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.)
Expired
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EP83103415A
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German (de)
French (fr)
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EP0093273A3 (en
EP0093273A2 (en
Inventor
Ingo Dipl.-Ing. Dr. Bleckmann
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ELPAG AG CHUR
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ELPAG AG CHUR
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Priority to AT83103415T priority Critical patent/ATE20969T1/en
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Publication of EP0093273A3 publication Critical patent/EP0093273A3/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
    • 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
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/017—Manufacturing methods or apparatus for heaters

Definitions

  • the invention relates to a radiation unit for a stove or the like.
  • a glass ceramic plate arranged above the radiation unit, consisting of a plate-shaped heating coil carrier made of high-temperature-resistant material and carrying an electric heating coil.
  • Electric cookers with glass ceramic plates are becoming increasingly popular, especially since the glass ceramic plate is easy to keep clean and because pots and pans can be moved more easily on the flat plate over the entire stove. Since the heat transfer in these cookers takes place predominantly by radiation and to a lesser extent by heat conduction, compared to electric cookers with metal heating plates, higher temperatures of the heating coil result with a certain amount of heat to be transferred to the cooking or roasting material. This results in a comparatively shorter service life for the heating coil. This is disadvantageous in that it is not possible to replace individual hot plates, particularly in cookers with glass ceramic plates, but rather the entire glass ceramic plate with those arranged underneath
  • Radiation units must be removed. Radiation units of the type in question are known in various embodiments. For example, reference is made to DE-A-30 07 806.9-16 and DE-C-27 29 929.
  • the invention is based on the object of improving the service life of the helix in radiation units of the type in question, i. H. approximately double, namely by lowering the heating coil temperature by approximately 50 C for a specific heat conduction to be transferred.
  • the heating coil carrier For the heating coil carrier, high-temperature-resistant materials were used in the known embodiments, which had a thermal conductivity of the order of 0.09 W / m grd. One reason for this may be that high-temperature-resistant and electrically very good insulating materials generally also have poor thermal conductivity, so that it was obvious to use such materials. Furthermore, it was assumed that heat radiation downwards should be prevented as far as possible.
  • the heating coil carrier was used for thermal insulation, d. H. it should consist of the poorest possible heat-conducting material. In contrast, the invention takes a fundamentally different route.
  • the heating coil carrier is made of a good heat-conducting material. The downward heat insulation can be brought about by a separate heat insulation body.
  • the attachment of the heating coil is problematic, as described in the above-mentioned DE-C-27 29 929. If the heating coil is embedded or glued into grooves in the heating coil support, it will reach a higher temperature with the disadvantage of a shortened service life. If you place them freely on the surface of the heating coil carrier and connect them to it with nails, there is a risk that the nails will come loose due to the thermal alternating stresses and vibrations. However, if, as suggested, the heating coil carrier is made of a good heat-conducting material, the heating coil can be glued into corresponding grooves, whereby it is protected and securely fixed and nevertheless achieves at least the same service life as a heating coil freely placed on the heating coil carrier.
  • the areas of the coil carrier between the adjacent sections of the spiral-shaped heating coil are used for greater heat transfer to the cooking or roasting material.
  • the temperature gradient on the surface of the heating coil carrier is substantially leveled with the effect that the temperature of the heating coil can be reduced by approximately 50 ° C. with the same heat transfer.
  • the new effect can be demonstrated by placing a known arrangement and a new arrangement on the glass ceramic plate, e.g. a piece of meat is put on.
  • the piece of meat shows a grill effect, i. H. trough-shaped strong tans corresponding to the course of the heating coil, whereas a uniform tanning is achieved with the new arrangement.
  • the radiation unit according to the invention can be moved closer to the glass ceramic plate. This enables either a flatter design or, with the same thickness of the radiation unit, an improvement in the thermal insulation on the underside of the radiation unit.
  • the heating coil must have a certain distance from the glass ceramic plate in order for one corresponding efficiency results. This distance is generally 10 mm. At the temperatures prevailing in the air space between the heating coil and the glass ceramic plate, there is a strong ionization of the air, namely by ions radiated by the heating coil. If the heating coil rises by 1 - 2 mm at one point due to the thermal load, this can lead to an electrical breakdown with a corresponding risk.
  • U-shaped hooks are mainly used in practice, which are driven into the heating coil holder and hold the heating coil in the grooves of the holder. It is understandable that the installation of a large number of U-shaped hooks represents a considerable amount of work, which, however, has been considered inevitable according to the previous knowledge. Accordingly, it is preferred that the heating coil be embedded in an adhesive with a relatively good thermal conductivity, which is applied continuously over the entire groove base.
  • a heating coil support 1 made of a good heat-conducting material has grooves 2 in the form of a double spiral on its surface.
  • the heating coil carrier 1 is fastened to a glass ceramic plate 3, which extends generally continuously over the entire stove, by means of fastening means (not shown).
  • the desired temperature is regulated by means of a thermostat sensor 4 and a thermostat 5.
  • the entire base of the groove of the double spiral is provided with an adhesive 6, into which the heating coil 7 is pressed.
  • the device has a swivel arm 8, on which a stamp 9, z. B. a rubber stamp is attached.
  • the stamp 9 has elevations 10 which correspond exactly to the shape and arrangement of the grooves 2 - that is, a counter-profile to the surface of the heating coil holder 1.
  • the stamp 9 is raised via the swivel arm 8 and swiveled via a heating coil holder 1 provided.
  • the elevations 10 enter the grooves 2 in the heating coil holder 1 and in this way wet the groove base with adhesive.
  • the heating coil 7 can then be inserted into the grooves in the heating coil holder 1.
  • the heating coil is then fixed after the adhesive has dried. Practical tests showed that the fixing of the heating coil over its entire length in the base of the groove precludes the heating coil sections, as described at the beginning, from climbing up.
  • the heating coil holders to be provided with adhesive can be arranged on a turntable 12, so that a correspondingly cyclical work with high production output is possible.
  • two stamps 9 can also be used, one of which is immersed in the adhesive bath 11, while the other is pressed onto the heating coil holder 1.
  • the thermal conductivity of the material of the heating coil holder and / or the adhesive should be> 0.3 W / m at about 1000 ° C.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)
  • Radiation-Therapy Devices (AREA)
  • Measurement Of Radiation (AREA)
  • Electric Stoves And Ranges (AREA)

Abstract

1. A radiant unit for a cooking range or the like, having a glass-ceramic plate (3) disposed above said radiant unit, said radiant unit consisting of a plate-shaped, coiled heater-filament support (1), made of a high-temperature resistant material, for supporting an electric coiled heater-filament (7), characterized in that the coiled heaterfilament support (1) has a relatively good thermal conductivity of > lambda = 0.3 W/m degree at about 1000 degrees C.

Description

Die Erfindung betrifft eine Strahlungseinheit für einen Herd oder dgl. mit einer oberhalb der Strahlungseinheit angeordneten Glaskeramikplatte, bestehend aus einem eine elektrische Heizwendel tragenden plattenförmigen Heizwendelträger aus hochtemperaturfestem Material.The invention relates to a radiation unit for a stove or the like. With a glass ceramic plate arranged above the radiation unit, consisting of a plate-shaped heating coil carrier made of high-temperature-resistant material and carrying an electric heating coil.

Elektrische Herde mit Glaskeramikplatten erfreuen sich zunehmender Beliebtheit, vor allem, da sich die Glaskeramikplatte leicht sauberhalten läßt und da auf der über den gesamten Herd ebenen Platte Töpfe und Pfannen leichter verschoben werden können. Da bei diesen Herden die Wärmeübertragung überwiegend durch Strahlung und in geringerem Maße durch Wärmeleitung erfolgt, ergeben sich im Vergleich zu elektrischen Herden mit Heizplatten aus Metall höhere Temperaturen der Heizwendel bei einer bestimmten auf das Koch- oder Bratgut zu übertragenden Wärmemenge. Daraus resultiert eine vergleichsweise geringere Lebensdauer der Heizwendel. Dies ist insoweit nachteilig, da gerade bei Herden mit Glaskeramikplatten nicht einzelne Kochplatten ausgewechselt werden können, sondern die gesamte Glaskeramikplatte mit den darunter angeordnetenElectric cookers with glass ceramic plates are becoming increasingly popular, especially since the glass ceramic plate is easy to keep clean and because pots and pans can be moved more easily on the flat plate over the entire stove. Since the heat transfer in these cookers takes place predominantly by radiation and to a lesser extent by heat conduction, compared to electric cookers with metal heating plates, higher temperatures of the heating coil result with a certain amount of heat to be transferred to the cooking or roasting material. This results in a comparatively shorter service life for the heating coil. This is disadvantageous in that it is not possible to replace individual hot plates, particularly in cookers with glass ceramic plates, but rather the entire glass ceramic plate with those arranged underneath

Strahlungseinheiten abgenommen werden muß. Strahlungseinheiten der in Rede stehenden Art sind in verschiedenen Ausführungsformen bekannt. Beispielsweise wird auf die DE-A-30 07 806.9-16 und auf die DE-C-27 29 929 verwiesen.Radiation units must be removed. Radiation units of the type in question are known in various embodiments. For example, reference is made to DE-A-30 07 806.9-16 and DE-C-27 29 929.

Der Erfindung liegt nun die Aufgabe zugrunde, bei Strahlungseinheiten der in Rede stehenden Art die Lebensdauer der Helzwendel zu verbessern, d. h. etwa zu verdoppeln, und zwar durch Absenkung der Heizwendeltemperatur um etwa 50 C bei einer bestimmten zu übertragenden Wärmeleileitung.The invention is based on the object of improving the service life of the helix in radiation units of the type in question, i. H. approximately double, namely by lowering the heating coil temperature by approximately 50 C for a specific heat conduction to be transferred.

Die Lösung der Aufgabe ergibt sich aus den kennzeichnenden Merkmalen des Patentanspruchs 1. Die abhängigen Patentanspüche 2 bis 6 beschreiben bevorzugte Ausführungsformen.The solution to the problem results from the characterizing features of patent claim 1. The dependent patent claims 2 to 6 describe preferred embodiments.

Für den Heizwendelträger wurden bei den bekannten Ausführungsformen hochtemperaturfeste Materialien verwendet, die eine Wärmeleitfähigkeit in der Größenordnung von 0,09 W/m grd besaßen. Ein Grund hierfür kann darin liegen, daß hochtemperaturbeständige und elektrisch sehr gut isolierende Materialien im allgemeinen auch eine schlechte Wärmeleitfähigkeit besitzen, so daß es nahelag, derartige Materialien einzusetzen. Weiterhin ging man davon aus, daß eine Wärmeabstrahlung nach unten möglichst verhindert werden sollte. Der Heizwendelträger diente zur Wärmedämmung, d. h. er sollte aus möglichst schlecht wärmeleitendem Material bestehen. Demgegenüber beschreitet die Erfindung einen grundsätzlich anderen Weg. Der Heizwendelträger wird aus einem gut wärmeleitenden Material hergestellt. Die Wärmeisolation nach unten kann durch einen gesonderten Wärmeisolationskörper bewirkt werden.For the heating coil carrier, high-temperature-resistant materials were used in the known embodiments, which had a thermal conductivity of the order of 0.09 W / m grd. One reason for this may be that high-temperature-resistant and electrically very good insulating materials generally also have poor thermal conductivity, so that it was obvious to use such materials. Furthermore, it was assumed that heat radiation downwards should be prevented as far as possible. The heating coil carrier was used for thermal insulation, d. H. it should consist of the poorest possible heat-conducting material. In contrast, the invention takes a fundamentally different route. The heating coil carrier is made of a good heat-conducting material. The downward heat insulation can be brought about by a separate heat insulation body.

Die Befestigung der Heizwendel ist problematisch, wie dies in der obengenannten DE-C-27 29 929 beschrieben wird. Wenn die Heizwendel in Rillen des Heizwendelträgers eingebettet oder eingeklebt wird, dann erreicht sie eine höhere Temperatur mit dem Nachteil einer verkürzten Lebensdauer. Legt man sie frei auf die Oberfläche des Heizwendelträgers und verbindet man sie mit demselben durch Nägel, so besteht die Gefahr, daß die Nägel aufgrund der thermischen Wechselbeanspruchungen und bei Erschütterungen sich lösen. Wird jedoch, wie vorgeschlagen, der Heizwendelträger aus einern gut wärmeleitenden Material hergestellt, kann man die Heizwendel in entsprechende Rillen einkleben, wodurch sie geschützt und sicher fixiert ist und trotzdem mindestens die gleiche Lebensdauer erreicht wie eine frei auf den Heizwendelträger aufgelegte Heizwendel.The attachment of the heating coil is problematic, as described in the above-mentioned DE-C-27 29 929. If the heating coil is embedded or glued into grooves in the heating coil support, it will reach a higher temperature with the disadvantage of a shortened service life. If you place them freely on the surface of the heating coil carrier and connect them to it with nails, there is a risk that the nails will come loose due to the thermal alternating stresses and vibrations. However, if, as suggested, the heating coil carrier is made of a good heat-conducting material, the heating coil can be glued into corresponding grooves, whereby it is protected and securely fixed and nevertheless achieves at least the same service life as a heating coil freely placed on the heating coil carrier.

Bei der neuen Ausbildung werden die Bereiche des Wendelträgers zwischen den benachbarten Abschnitten der spiralförmig angeordneten Heizwendel zu einer stärkeren Wärmeübertragung auf das Koch- oder Bratgut herangezogen. Das Temperaturgefälle an der Oberfläche des Heizwendelträgers wird wesentlich eingeebnet mit dem Effekt, daß bei gleicher Wärmeübertragung die Temperatur der Heizwendel um ungefähr 50° C abgesenkt werden kann. Der neuartige Effekt kann demonstriert werden, indem je auf die Glaskeramikplatte einer bekannten Anordnung und einer neuen Anordnung z.B. ein Fleischstück aufgelegt wird. Bei der bekannten Anordnung zeigt das Fleischstück einen Grilleffekt, d. h. dem Heizwendelverlauf entsprechende rinnenförmige starke Einbräunungen, wogegen bei der neuen Anordnung eine gleichmäßige Bräunung erzielt wird. Dadurch ergibt sich auch bei der neuen Anordnung eine geringere Wärmebelastung der Glaskeramikplatte und der darauf abgestellten Brat- oder Kochgeschirre. Bei gleicher Belastung kann die Strahlungseinheit gemäß der Erfindung näher an die Glaskeramikplatte herangerückt werden. Dies ermöglicht entweder eine flachere Bauweise oder bei gleicher Stärke der Strahlungseinheit eine Verbesserung der Wärmeisolation an der Unterseite der Strahlungseinheit.In the new design, the areas of the coil carrier between the adjacent sections of the spiral-shaped heating coil are used for greater heat transfer to the cooking or roasting material. The temperature gradient on the surface of the heating coil carrier is substantially leveled with the effect that the temperature of the heating coil can be reduced by approximately 50 ° C. with the same heat transfer. The new effect can be demonstrated by placing a known arrangement and a new arrangement on the glass ceramic plate, e.g. a piece of meat is put on. In the known arrangement, the piece of meat shows a grill effect, i. H. trough-shaped strong tans corresponding to the course of the heating coil, whereas a uniform tanning is achieved with the new arrangement. This results in a lower thermal load on the glass ceramic plate and the roasting or cooking utensils placed on it, even with the new arrangement. With the same load, the radiation unit according to the invention can be moved closer to the glass ceramic plate. This enables either a flatter design or, with the same thickness of the radiation unit, an improvement in the thermal insulation on the underside of the radiation unit.

Besonders günstige Ergebnisse werden erzielt, wenn die Erfindung auf die Strahlkochplatte gemäß der DE-A-30 07 806 angewendet wird, d. h. wenn im Bereich unter den Heizwendelabschnitten und zwischen den Heizwendelabschnitten Löcher in dem Heizwendelträger vorgesehen werden, welche eine Luftkonvektionsströmung bewirken.Particularly favorable results are achieved if the invention is applied to the jet hotplate according to DE-A-30 07 806, i. H. if holes are provided in the area under the heating coil sections and between the heating coil sections, which cause an air convection flow.

Es treten bei den Strahlkochplatten Probleme auf, die bei geschlossenen Kochplatten nicht auftreten, so daß insoweit bei geschlossenen Kochplatten getroffene Maßnahmen nicht auf Strahlkochplatten übertragbar sind. Ein wesentliches problem liegt in dem "Hochsteigen" eines Wendelabschnittes. Die Heizwendel muß einen bestimmten Abstand von der Glaskeramikplatte haben, damit sich ein entsprechender Wirkungsgrad ergibt. Dieser Abstand beträgt im allgemeinen 10 mm. Bei den im Luftraum zwischen der Heizwendel und der Glaskeramikplatte herrschenden Temperaturen tritt eine starke Ionisierung der Luft auf, und zwar durch von der Heizwendel abgestrahlte lonen. Wenn nun die Heizwendel aufgrund der thermischen Belastung an einer Stelle um 1 - 2 mm hochsteigt, kann dies zu einem elektrischen Durchschlag mit entsprechender Gefährdung führen. Um dies zu verhindern, werden in der Praxis überwiegend U-förmige Haken in großer Anzahl verwendet, welche in die Heizwendelhalterung eingetrieben werden und die Heizwendel in den Rillen der Halterung halten. Es ist verständlich, daß das Anbringen einer großen Anzahl von U-förmigen Haken einen beträchtlichen Arbeitsaufwand darstellt, der jedoch nach den bisherigen Erkenntnissen als unvermeidbar angesehen wurde. Es wird dementsprechend bevorzugt, daß die Heizwendel in einen Kleber mit relativ guter Wärmeleitfähigkeit eingebettet wird, welcher durchgehend über den gesamten Rillengrund aufgetragen ist.Problems arise with the hotplates which do not occur with closed hotplates, so that measures taken with closed hotplates cannot be transferred to the hotplates. A major problem lies in the "ascent" of a spiral section. The heating coil must have a certain distance from the glass ceramic plate in order for one corresponding efficiency results. This distance is generally 10 mm. At the temperatures prevailing in the air space between the heating coil and the glass ceramic plate, there is a strong ionization of the air, namely by ions radiated by the heating coil. If the heating coil rises by 1 - 2 mm at one point due to the thermal load, this can lead to an electrical breakdown with a corresponding risk. To prevent this, a large number of U-shaped hooks are mainly used in practice, which are driven into the heating coil holder and hold the heating coil in the grooves of the holder. It is understandable that the installation of a large number of U-shaped hooks represents a considerable amount of work, which, however, has been considered inevitable according to the previous knowledge. Accordingly, it is preferred that the heating coil be embedded in an adhesive with a relatively good thermal conductivity, which is applied continuously over the entire groove base.

Die beiliegenden Zeichnungen dienen der weiteren Erläuterung der Erfindung. Es zeigen:

  • Fig. 1 einen Schnitt durch eine Strahlkochplatte;
  • Fig. 2 in vergrößertem Maßstab einen Ausschnitt aus Fig. 1;
  • Fig. 3 eine Draufsicht auf die Strahlkochplatte;
  • Fig. 4 eine schematische Ansicht einer Vorrichtung zum Aufbringen eines Klebers in den Rillengrund der Heizwendelhalterung.
The accompanying drawings serve to further explain the invention. Show it:
  • 1 shows a section through a jet hotplate.
  • FIG. 2 shows an enlarged detail from FIG. 1;
  • 3 shows a plan view of the jet hotplate;
  • Fig. 4 is a schematic view of a device for applying an adhesive in the groove bottom of the heating coil holder.

Ein Heizwendelträger 1 aus gut wärmeleitendem Material besitzt an seiner Oberfläche Rillen 2 in Form einer Doppelspirale. Der Heizwendelträger 1 ist mittels nicht dargestellter Befestigungsmittel an einer sich im allgemeinen durchgehend über den gesamten Herd erstreckenden Glaskeramikplatte 3 befestigt. Die erwünschte Temperatur wird mittels eines Thermostatfühlers 4 und eines Thermostaten 5 einreguliert.A heating coil support 1 made of a good heat-conducting material has grooves 2 in the form of a double spiral on its surface. The heating coil carrier 1 is fastened to a glass ceramic plate 3, which extends generally continuously over the entire stove, by means of fastening means (not shown). The desired temperature is regulated by means of a thermostat sensor 4 and a thermostat 5.

Im Unterschied zu bekannten Lösungen wird der gesamte Rillengrund der Doppelspirale mit einem Kleber 6 versehen, in welchen die Heizwendel 7 eingedrückt wird.In contrast to known solutions, the entire base of the groove of the double spiral is provided with an adhesive 6, into which the heating coil 7 is pressed.

Damit die Wärmeabstrahlung nach unten möglichst reduziert wird, wäre es an und für sich naheliegend, einen Kleber 6 zu verwenden, der eine schlechte Wärmeleitfähigkeit besitzt. Es zeigte sich jedoch überraschenderweise, daß Kleber, die eine relativ gute Wärmeleitfähigkeit haben, wesentlich günstiger sind. Wenn die Wärmeleitfähigkeit um 10 O fo verbessert wird, dann sinkt die Temperatur der Heizwendel urn etwa 50°C, wodurch sich die Lebensdauer der Heizwendel verdoppelt. Durch die bessere Wärmeübertragung auf die zwischen den Rillen liegenden Erhebungen der Heizwendelhalterung ergibt sich auch eine wesentliche Abflachung der Temperaturkurve über der Glaskeramikplatte.So that the heat radiation downwards is reduced as much as possible, it would be obvious in itself to use an adhesive 6 which has poor thermal conductivity. Surprisingly, however, it was found that adhesives which have a relatively good thermal conductivity are considerably cheaper. If the thermal conductivity is improved by 10 O f o, the temperature of the heating coil drops by about 50 ° C., which doubles the service life of the heating coil. The better heat transfer to the elevations of the heating coil holder lying between the grooves also results in a substantial flattening of the temperature curve over the glass ceramic plate.

Die Lösung, den gesamten Rillengrund mit Klebstoff zu bestreichen, erscheint auf den ersten Augenblick als zu aufwendig, als daß eine praktische Realisierung möglich wäre. Es zeigt sich jedoch, daß dieses Problem mittels einer Vorrichtung gelöst werden kann, wie sie schematisch in Figur 4 dargestellt ist.At first glance, the solution of coating the entire groove base with adhesive appears to be too complex to be practically possible. It turns out, however, that this problem can be solved by means of a device as shown schematically in FIG.

Die Vorrichtung besitzt einen Schwenkarm 8, an welchem ein Stempel 9, z. B. ein Gummistempel, befestigt ist. Der Stempel 9 besitzt Erhebungen 10, die genau der Form und Anordnung der Rillen 2 entsprechen - also ein Gegenprofil zur Oberfläche der Heizwendelhalterung 1. Durch Absenken des Stempels 9 in ein Kleberbad 11 werden die Erhebungen 10 des Stempels 9 mit Klebstoff benetzt. Der Stempel 9 wird über den Schwenkarm 8 angehoben und über eine bereitgestellte Heizwendelhalterung 1 verschwenkt. Beim Absenken des Stempels 9 treten die Erhebungen 10 in die Rillen 2 der Heizwendelhalterung 1 ein und benetzen auf diese Weise den Rillengrund mit Klebstoff. Anschließend kann die Heizwendel 7 in die Rillen der Heizwendelhalterung 1 eingelegt werden. Die Heizwendel ist dann nach Trocknen des Klebers fixiert. Praktische Versuche zeigten, daß die Fixierung der Heizwendel über ihre gesamte Länge im Rillengrund ausschließt, daß Heizwendelabschnitte, wie eingangs beschrieben, hochsteigen können.The device has a swivel arm 8, on which a stamp 9, z. B. a rubber stamp is attached. The stamp 9 has elevations 10 which correspond exactly to the shape and arrangement of the grooves 2 - that is, a counter-profile to the surface of the heating coil holder 1. By lowering the stamp 9 into an adhesive bath 11, the elevations 10 of the stamp 9 are wetted with adhesive. The stamp 9 is raised via the swivel arm 8 and swiveled via a heating coil holder 1 provided. When the stamp 9 is lowered, the elevations 10 enter the grooves 2 in the heating coil holder 1 and in this way wet the groove base with adhesive. The heating coil 7 can then be inserted into the grooves in the heating coil holder 1. The heating coil is then fixed after the adhesive has dried. Practical tests showed that the fixing of the heating coil over its entire length in the base of the groove precludes the heating coil sections, as described at the beginning, from climbing up.

Die mit Klebstoff zu versehenden Heizwendelhalterungen können auf einem Drehtisch 12 angeordnet sein, so daß ein entsprechend taktweises Arbeiten mit hohern produktionsausstoß möglich ist. Selbstverständlich können auch zwei Stempel 9 verwendet werden, von denen jeweils einer in das Klebstoffbad 11 eintaucht, während der andere auf die Heizwendelhalterung 1 aufgedrückt wird.The heating coil holders to be provided with adhesive can be arranged on a turntable 12, so that a correspondingly cyclical work with high production output is possible. Of course, two stamps 9 can also be used, one of which is immersed in the adhesive bath 11, while the other is pressed onto the heating coil holder 1.

Die Wärmeleitfähigkeit des Materials der Heizwendelhalterung und/oder des Klebers soll > als 0,3 W/m grd bei etwa 1000°C sein.The thermal conductivity of the material of the heating coil holder and / or the adhesive should be> 0.3 W / m at about 1000 ° C.

Claims (5)

1. A radiant unit for a cooking range or the like, having a glass-ceramic plate (3) disposed above said radiant unit, said radiant unit consisting of a plate-shaped, coiled heater-filament support (1), made of a high-temperature resistant material, for supporting an electric coiled heater-filament (7), characterized in that the coiled heaterfilament support (1) has a relatively good thermal conductivity of > λ= 0.3 W/m degree at about 1000° C.
2. A radiant unit according to claim 1, characterized in that the thermal conductivity of the coiled heater-filament support is between 0.6 and 0.9, preferably 0.7 W/m degree at 1000°C.
3. A radiant unit according to claim 1 or 2, characterized in that the coiled heater-filament support (1) consists of a compressed fibre material.
4. A radiant unit according to any one of claims 1 to 3, characterized in that the coiled heater- filament support (1) contains magnesite.
5. A radiant heater according to any one of claims 1 to 4, characterized in that the heater- filament (7) is adhered along the entire length thereof in corresponding grooves (2) of the thermally well conducting coiled heater-filament support (1) by means of an adhesive having a thermal conductivity of at least 0.3 W/m degree at about 1000°C.
EP83103415A 1982-05-03 1983-04-08 Radiation unit for a range or the like Expired EP0093273B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83103415T ATE20969T1 (en) 1982-05-03 1983-04-08 RADIANT UNIT FOR A STOVE OR LIKE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823216508 DE3216508A1 (en) 1982-05-03 1982-05-03 RADIATION UNIT FOR A STOVE OR THE LIKE
DE3216508 1982-05-03

Publications (3)

Publication Number Publication Date
EP0093273A2 EP0093273A2 (en) 1983-11-09
EP0093273A3 EP0093273A3 (en) 1984-03-14
EP0093273B1 true EP0093273B1 (en) 1986-07-23

Family

ID=6162590

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83103415A Expired EP0093273B1 (en) 1982-05-03 1983-04-08 Radiation unit for a range or the like

Country Status (3)

Country Link
EP (1) EP0093273B1 (en)
AT (1) ATE20969T1 (en)
DE (2) DE3216508A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3781522A (en) * 1972-03-27 1973-12-25 Gen Electric Thermochromic surface heating apparatus
DE2351249A1 (en) * 1973-10-12 1975-04-17 Buderus Eisenwerk Flat-topped electric cooker panel - made of high-grade steel clad underneath with boiler-ring-sized metal plates
US3885128A (en) * 1974-07-01 1975-05-20 Gen Electric Glass-ceramic plate heating unit cast-in heat spreader
DE3102935A1 (en) * 1981-01-29 1982-09-02 Grünzweig + Hartmann und Glasfaser AG, 6700 Ludwigshafen DEVICE FOR THE HEAT-INSULATING STORAGE OF AN ELECTRIC HEATER, IN PARTICULAR FOR A RADIATION-HEATED COOKING PLATE, AND A HEAT-INSULATING PLATE THEREFOR AND METHOD FOR THE PRODUCTION THEREOF

Also Published As

Publication number Publication date
DE3364646D1 (en) 1986-08-28
ATE20969T1 (en) 1986-08-15
EP0093273A3 (en) 1984-03-14
DE3216508A1 (en) 1983-11-03
EP0093273A2 (en) 1983-11-09

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