EP0189108B1 - Dispositif de chauffage, en particulier une plaque de cuisson chauffée par radiation, ainsi que son procédé de fabrication - Google Patents

Dispositif de chauffage, en particulier une plaque de cuisson chauffée par radiation, ainsi que son procédé de fabrication Download PDF

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Publication number
EP0189108B1
EP0189108B1 EP86100466A EP86100466A EP0189108B1 EP 0189108 B1 EP0189108 B1 EP 0189108B1 EP 86100466 A EP86100466 A EP 86100466A EP 86100466 A EP86100466 A EP 86100466A EP 0189108 B1 EP0189108 B1 EP 0189108B1
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EP
European Patent Office
Prior art keywords
supporting layer
heating
heating coil
heating device
layer
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.)
Revoked
Application number
EP86100466A
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German (de)
English (en)
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EP0189108A1 (fr
Inventor
Hans Kummermehr
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Ceramaspeed Ltd
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Ceramaspeed Ltd
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Publication date
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Application filed by Ceramaspeed Ltd filed Critical Ceramaspeed Ltd
Priority to AT86100466T priority Critical patent/ATE65150T1/de
Publication of EP0189108A1 publication Critical patent/EP0189108A1/fr
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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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/688—Fabrication of the plates
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • 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 heating device, in particular for a radiation-heated hotplate, according to the preamble of claim 1, and to processes which are particularly suitable for its production according to the preamble of claim 7.
  • the thermal insulation must be carried out on the outside facing away from the heating coil in a very small space with a high temperature gradient. Therefore, a highly disperse insulation material is used for the insulation layer.
  • This insulation material consists of a microporous oxide airgel obtained from flame hydrolysis, in particular silica airgel and / or aluminum oxide airgel, usually with suitable additives such as reinforcing mineral fibers and / or opacifiers and / or binders for hardening.
  • This thermal insulation material is either pressed directly into the receiving shell of the heating device to form the insulating layer, or is pre-pressed as a plate and inserted into the receiving shell.
  • a major problem is the storage of the heating coil on the top of the insulation layer made of the insulation material described. It is known from EP-A-79 076 that the heating coil or other heating element is directly in the thermal insulation material of the insulation layer press in. For this purpose, the heating element is placed in the pressing tool and covered with the still powdery insulation material, after which the heating element is pressed together with the insulation material in order to achieve the desired degree of compression of the insulation material.
  • the upper press-in layer of the thermal insulation material can contain a different consistency than the rest of the insulating layer and, in addition to a high proportion of hardener, can contain an electrically insulating, heat-conducting substance.
  • the heating coil is pressed in, at least one third of its coil diameter, that is to say its overall height, the pressed-in part being completely surrounded by the pressed thermal insulation material and thus anchored.
  • the material of the press-fit layer must contain heat-conducting additives in order to avoid destructive heat build-up in the embedding area by appropriate heat dissipation; as a result, the thermal insulation material of the press-fit layer is stripped of its essential property, namely the outstanding thermal insulation.
  • the thermal insulation material and the heating coil Since in practice it must always be ensured that intimate, direct contact between the thermal insulation material and the heating coil is avoided, a special bearing material is regularly provided for the heating coil. In addition to minimizing the installation effort, the storage of the heating coil must be optimized according to various, sometimes contradicting, aspects. In addition to the best possible thermal insulation with the lowest possible overall height, it is particularly important to ensure that the heating coil can on the one hand radiate upwards as best as possible, but on the other hand is sufficiently securely held in place to withstand short circuits due to mutual contact of the spiral sections, in view of the very considerable thermal expansions during operation exclude and to get a uniform radiation pattern.
  • the heating coil When the heating coil is received in grooves, a substantial part of the outer surface of the heating coil is always covered and can therefore only generate useful radiation to a reduced extent.
  • the storage in grooves especially if these are lined with a closed-surface hard coating, provides a clean positional securing.
  • the radiation can be optimized by anchoring the heating coil on a flat bearing layer, but the heating coil cannot be permanently anchored securely on such a flat bearing layer in view of the considerable temperature changes.
  • the invention has for its object to provide a heating device of the type specified in the preamble of claim 1, in which the heating coil Despite the extreme temperature changes that occur, it is permanently securely stored and at the same time ensures improved, that is to say optimal, heat radiation, the manufacture of the heating device being carried out with a minimum of effort and, furthermore, the greatest possible thermal insulation with the lowest possible overall height being achieved.
  • each individual spiral wire is embedded in the material of the bearing layer only with its lower arch section, i. H. only at most up to about the full wire gauge. This means that the wire of the heating coil is clamped in a quasi-punctiform manner only in the lower apex region of the arch section in the bearing layer, but is otherwise freely available for radiation over its entire length.
  • the entire thermal insulation material is arranged on the side of the heating coil to be insulated, it unfolds fully Insulation effect to the side to be insulated.
  • the material of the insulating layer can be pressed flat or with an uncomplicated shape, so that this reduces manufacturing costs.
  • the bearing layer only needs to have a very small layer thickness, depending on the wire thickness of the heating coil or even less, and thus only makes a minor contribution to the overall height.
  • the material of the bearing layer can be designed, for example by adding opacifying agents or the like, with a view to optimizing its contribution to thermal insulation without fear of disadvantageous heat build-up. Furthermore, since the material of the insulation layer is not mechanically stressed by the storage of the heating coil, its consistency, in particular its degree of compression, can also be optimized with regard to thermal insulation aspects, so that overall the greatest possible thermal insulation results in the smallest possible height.
  • either the bearing layer can be prefabricated as a thin plate with the heating coil anchored thereon and then - optionally at another location - combined with the likewise plate-shaped or also pressed-in insulation layer, or else there is a coating of the insulating layer directly with the material of the bearing layer with subsequent pressing in of the heating coil, in which case a support ring can also be bonded to the material of the bearing layer in a particularly advantageous manner.
  • the heating device shown consists essentially of a receptacle 1 made of metal, in particular aluminum sheet, and thermal insulation material in the form of a thermal barrier layer 2, which is arranged on the inside of the peripheral wall 3 of the receptacle 1 between the bottom 4 and a heating coil 5.
  • the electrically operated heating coil 5 has electrical connections, not shown, which are led out of the area of the receiving shell 1 in a suitable manner.
  • the heating device shown is used for radiant heating of a glass ceramic cover of a hotplate, the glass ceramic plate (not shown in detail) resting on a support surface 10 and thus being kept at a distance from the upper edge of the peripheral wall 3 of the receiving shell 1 and from the heating coil 5.
  • the peripheral wall 3 of the receiving shell 1 and thus the entire heating device has an essentially circular shape in plan view and is concentric with a central axis 9.
  • the insulation layer 2 consists of fine-pored silica airgel with additives. This material is known per se and shows in addition to the silica airgel in all Rule a mineral fiber reinforcement and / or an opacifier and / or a binder as a hardener; Regarding details, reference is made to the relevant DE-OSen 27 47 663, 27 48 307, 27 54 956 and 31 08 816, to which reference is expressly made in this regard.
  • a material is preferably used for the insulation layer 2, which consists of 30 to 50% by weight of pyrogenic silica, 20 to 50% by weight of opacifying agent and 5 to 15% by weight of aluminum fibers and in a density of 200 to 400 kg / m3 is present, but does not need to be organic or inorganic hardened.
  • a special thermal insulation material has a thermal conductivity that is lower than that of still air and, moreover, is only slightly temperature-dependent.
  • the plates or layers pressed from such powdery base materials are not mechanically resistant.
  • the material can also contain aluminum oxide airgel, or a suitable mixture of both aerogels, in order to achieve higher temperature resistance if required.
  • the insulation material of the insulation layer can contain 2 additions of high temperature resistant materials such as manganese oxide, zirconium oxide or titanium oxide. For special purposes you can also work with their airgel.
  • a bearing layer 7 is arranged on the insulation layer 2 and can have a thickness of approximately 1 mm or a little more.
  • the bearing layer 7 may consist of a mixture of materials that contains mineral fibers and a ceramic binder that solidifies at temperatures between about 500 ° C. and 1000 ° C. by ceramic bonding.
  • the proportion of mineral bevels should be as high as possible, since the mineral fibers counteract a tendency of the bearing layer 7 to shrink at elevated temperatures. Therefore, the mineral Fibers are present in a proportion of more than 50% by weight of the dry mixture, but preferably in an even higher proportion of 75 to 95% by weight, a proportion of approximately 80% by weight being selected in the example.
  • the mineral fibers have a softening or melting point of over 1000 ° C, preferably over 1100 ° C, so they are resistant to the temperatures that occur during operation.
  • Such adjustment of the softening or melting point of the fibers is achieved on the one hand by choosing a certain particle size, larger particles softening and sintering later than smaller powder-like particles, and by choosing the additives or fluxes in addition to the main aluminum oxide or silicon oxide component of the mineral fibers.
  • the mineral fibers are drawn from the melt with a thickness between about 0.5 and 3 microns, preferably between 1 and 2 microns and then ground so that they are broken to lengths between 2 and 20 microns, preferably between 5 and 10 microns, whereby however in any case the length of the mineral fibers whose thickness exceeds at least twice, so that there is actually still a fiber character.
  • the additives such as flux in the melt for the production of the fibers, such as Na2O, B2O3, MgO, Fe2O3 and other additives known per se, can then be selected so that the desired temperature resistance up to ranges above 1000 ° C or results in over 1100 ° C, i.e. in areas in which the mineral fibers based on aluminum silicate do not soften or melt at the maximum temperature occurring during operation.
  • the ceramic binder is silica sol, as is known per se for example for coating such a material from EP-A-81 825.
  • the silica sol as a ceramic binder is used together with inorganic fibers such as aluminum silicate fibers or quartz fibers and optionally other inorganic fillers applied in a slurry.
  • Suitable inorganic fibers for the coating material are in principle all correspondingly temperature-resistant fibers such as aluminum silicate fibers, quartz fibers, etc., but aluminum silicate fibers are generally preferred for reasons of cost.
  • the fibers must be so close together that the silica sol forms a connection between them and adheres to neighboring fibers instead of forming their own particles that are not bound to the filler.
  • the fibers thus primarily act as a dispersing agent for the silica sol in order to form a closed surface with it.
  • aluminum silicate fibers are even more expensive than most inorganic granular additives such as ground aluminum oxide, quartz sand, mullite, zirconium oxide, etc., so that these fibers can be stretched by granular fillers which are similar to the fibers, albeit to a lesser extent, than for cost reasons Dispersants can serve for the silica sol.
  • Clays and kaolin continue to be considered as inorganic granular additives.
  • Aluminum oxide, optionally with an admixture of kaolin, is preferred, which improves the suppleness of the bearing layer 7.
  • the amount of silica sol essentially results from the need for binders for the closed surface coating with regard to the desired caking of the fillers with one another.
  • the amount of the silica sol has a lower limit where the abrasion resistance of the surface is too low due to the binder content being too low.
  • the proportion of the silica sol as a solid must not be less than about one tenth of the fillers and fibers to be bound therewith in the surface coating, so that the silica sol in the closed surface coating is present in any case in a solids content of 10% by weight or more.
  • An increase in the proportion of silica sol initially gives one Increased abrasion resistance through better integration of the fibers and granular fillers as well as a shiny and smooth surface.
  • the proportion of the silica sol based on the amount of fillers in the coating composition may only be approximately 1: 1, so that at least as many parts by weight of fillers as dry parts by weight of silica sol are present in the closed storage layer 7.
  • the proportion of the fillers present in fiber form should not be less than a third of the fillers of the bearing layer 7 in order to allow the fibers to act sufficiently as network formers to form a closed film.
  • the above information relates to the proportions by weight in the finished bearing layer 7, so that the dry mass of the silica sol is taken into account.
  • the aqueous silica sol i.e. the colloidal silica
  • This can be supported by adding wetting agents, as is known per se, although mechanical support by doctor blades or rollers is of course also possible.
  • aqueous silica sol (30% solids content) 23.5% by weight aluminum silicate fibers 11.8 wt% alumina 5.9% by weight kaolin
  • aqueous silica sol (30% solids content) 13.3% by weight aluminum silicate fibers 6.7% by weight of aluminum oxide 10.0% by weight kaolin
  • aqueous silica sol (30% solids content) 25.53% by weight aluminum silicate fibers 12.75 wt% alumina 12.75 wt% clay
  • the masses are applied moist with a liquid to paste-like consistency corresponding to the type of application by spraying, knife coating, brushing, dipping, screen printing or the like.
  • the heating coil 5 has previously been stress-free annealed in the desired shape and is thus pretreated by means of a magnet with a temperature of, for example, 200 ° C. and pressed into the still moist bearing layer 7.
  • the indentation is preferably only carried out until about two thirds of the wire thickness of the lower arc section of each helix ring is immersed in the mass, due to the increased temperature of the heating coil, a certain solidification of the mass already occurs during the pressing in and thus the heating coil is attached. If necessary, a small proportion of organic additives can be added to the mass to achieve an adhesive effect.
  • the material When the heating coil is in operation, the material then ceramizes completely under the action of heat and cementes the embedded arch section of the heating coil to a certain extent.
  • the immersion depth should be kept as low as possible to minimize the radiation to hinder. The immersion depth of approximately 2/3 of the wire thickness shown in FIG. 2 is therefore optimal.
  • the radially outer peripheral region 6 of the receiving shell 1 or the insulating layer 2 and thus also the bearing layer 7 is bent upwards in the example shown in the example, so that the heating device as a whole has an approximately plate-like appearance in cross section.
  • a support ring 8 made of bonded fibers, for example a material such as that sold under the name Fiberfrax (registered trademark), is placed on the cranked peripheral region 6 and forms the support to the underside with the upper support surface 10 in the manner already described the glass ceramic plate.
  • the heater can be manufactured in various ways. First of all, the material of the insulating layer 2 can be pressed against the bottom 4 of the receiving shell 1 in a manner known per se and can thus be formed as a compressed insulating layer 2 directly above the bottom 4 of the receiving shell 1. The mass for forming the bearing layer 7 can then be applied to the surface of the insulating layer 2 formed in this way by spraying, brushing or the like, and the heating coil can be pressed in. Then the support ring 8 can also be expediently placed as long as the mass for forming the bearing layer 7 is still moist, and is thus held in place by adhesion. In such a case, the illustrated heating device is either prefabricated in one stage or - with an interruption and, if necessary, a change of location after the insulation layer 2 has been pressed in - in two stages.
  • the insulation layer 2 can also be prefabricated as a plate and thus pre-pressed and prefabricated into the receiving shell 1. In this case too, without the presence of the receiving shell 1, the formation of the bearing layer 7, the fitting thereof with the heating coil 5 and possibly the bearing ring 8 in the above described manner.
  • the bearing layer 7 can also be prefabricated separately and fitted with the heating coil 5, optionally also with the support ring 8, and thus dried or hardened.
  • This assembly unit can then be used together with a separately prefabricated plate-shaped insulating layer 2 in a receiving shell 1, or in a receiving shell 1 with pressed-in insulating layer 2.
  • the heating device according to the invention thus allows a large number of manufacturing options with great freedom of movement with regard to the manufacturing locations.
  • the production is in any case simple and problem-free, especially since the effort to produce grooves can also be dispensed with in view of the planar design of the surface of the bearing layer 7 according to the invention.
  • heating up to a desired temperature can take place immediately after embedding the heating coil 5, so that in any case sufficient drying and hardening of the mass for the bearing layer 7 takes place in the local storage areas.
  • Mineral pigments may also be present in the bearing layer 7, in particular in the form of TiO2 or TiO2-containing substances.
  • the mineral pigments which are not absolutely necessary, serve to scatter or reflect part of the IR radiation and to increase the abrasion resistance.
  • a TiO2-containing substance for example, a mixture of Al2O3 and TiO2 can be chosen, the TiO2 serving as a pigment and also as an opacifier against IR radiation.
  • suitable pigments include rutile, ilmenite, iron oxide, chromium oxide and the like. It is sufficient if the mineral pigments are present in the storage layer 7 in a proportion of up to a maximum of about 20% by weight of the dry mixture, but preferably in a proportion less than 10% by weight.
  • the storage layer may contain 7 5 wt .-% mineral pigments in the form of TiO2.
  • the use of pigments or opacifiers in the bearing layer 7 is therefore possible relatively easily because, due to the very slight embedding of the helix wire, there is no fear of a noticeable build-up of heat.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • General Preparation And Processing Of Foods (AREA)
  • Baking, Grill, Roasting (AREA)
  • Formation And Processing Of Food Products (AREA)

Claims (9)

  1. Dispositif de chauffage, en particulier pour une plaque de cuisson chauffée par rayonnement,

    avec une spirale de filament (5) alimenté par courant électrique et

    avec un dispositif de logement pour la spirale de filament (5),
    - avec une couche de support à surface fermée et plane,
    - avec une couche isolante (2) disposée sur la face de la couche de support (7) opposée a la spirale de filament (5) a base d'aérogel d'oxyde microporeux provenant de la pyrolyse de la flamme, en particulier de silice ou d'aluminium, en particulier avec un renforcement de fibres minérales et/ou un agent opacifiant qui est disposé avec la couche de support (7) et la spirale de filament (5) dans une cuvette de logement (1) fixée à la face inférieure de la plaque de cuisson,

    caractérisé en ce que

    la couche de support (7) comprend un liant inorganique résistant à la température comme substance de base ainsi que des charges inorganiques disposées avec la substance de base dans une suspension sur la couche isolante,

    le liant inorganique qui se solidifie par liaison céramique a des températures allant d'environ 500°C à 1.000 °C est un sol silicieux qui est présent dans un rapport de maximum 1 : 1 et minimum 1 : 9 avec les charges inorganiques, les charges inorganiques étant composées de fibres inorganiques dans une proportion recommandée d'au moins un tiers, et pour le reste de charges en granulés, et

    que chaque section arquée de la spirale du filament (5) orientée vers la couche de support (7) est noyée au maximum jusqu'à environ l'épaisseur complète du filament (5) dans le matériau de la couche de support (7) de sorte que le filament (5) soit protégé sur toute sa longueur contre les mouvements de migration dans le sens de l'étendue superficielle de la couche de support (7) et soit maintenu par l'effet d'adhérence sur la couche de support (7).
  2. Dispositif de chauffage selon la revendication 1, caractérisé en ce que la couche de support (7) contient des pigments minéraux.
  3. Dispositif de chauffage selon la revendication 2, caractérisé par l'utilisation de TiO₂ ou de substances contenant du TiO₂ comme pigments minéraux.
  4. Dispositif de chauffage selon la revendication 2 ou 3, caractérisé en ce que les pigments minéraux sont présents dans une proportion de 20 % en poids maximum, de préférence 10 % en poids maximum du mélange sec.
  5. Dispositif de chauffage selon une des revendications 1 à 4, caractérisé en ce que la couche de support (7) présente une épaisseur d'environ 1 mm ou un peu moins.
  6. Dispositif de chauffage selon une des revendications 1 à 5, caractérisé en ce que la profondeur d'immersion de la spirale du filament (5) est supérieure à la moitié de l'épaisseur du filament, et en particulier est égale à environ 2/3 de l'épaisseur du filament.
  7. Procédé de fabrication d'un dispositif de chauffage selon une des revendications 1 à 6, caractérisé en ce que la masse de formation de la couche de support est appliquée sur un support et que la spirale du filament préformée et recuite pour éliminer les tensions est de préférence pressée encore chaude dans la masse encore humide de la couche de support.
  8. Procédé selon la revendication 7, caractérisé en ce que la couche de support est ensuite séchée ou durcie et, après enlèvement de son support, est disponible comme élément de construction préfabriqué, le filament y étant ancré.
  9. Procédé selon la revendication 7, caractérisé en ce que la couche isolante comprimée est utilisée comme support et que des pièces supplémentaires, comme une bague d'appui périphérique, peuvent être fixées par collage à la masse encore humide de la couche de support.
EP86100466A 1985-01-25 1986-01-15 Dispositif de chauffage, en particulier une plaque de cuisson chauffée par radiation, ainsi que son procédé de fabrication Revoked EP0189108B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86100466T ATE65150T1 (de) 1985-01-25 1986-01-15 Heizvorrichtung, insbesondere fuer eine strahlungsbeheizte kochplatte, sowie verfahren zu ihrer herstellung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853502497 DE3502497A1 (de) 1985-01-25 1985-01-25 Heizvorrichtung, insbesondere fuer eine strahlungsbeheizte kochplatte, sowie verfahren zu ihrer herstellung
DE3502497 1985-01-25

Publications (2)

Publication Number Publication Date
EP0189108A1 EP0189108A1 (fr) 1986-07-30
EP0189108B1 true EP0189108B1 (fr) 1991-07-10

Family

ID=6260781

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86100466A Revoked EP0189108B1 (fr) 1985-01-25 1986-01-15 Dispositif de chauffage, en particulier une plaque de cuisson chauffée par radiation, ainsi que son procédé de fabrication

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EP (1) EP0189108B1 (fr)
AT (1) ATE65150T1 (fr)
DE (2) DE3502497A1 (fr)

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
DE4028743A1 (de) * 1990-09-11 1992-03-12 Miele & Cie Backofen mit einer backmuffel
DE4331702A1 (de) * 1993-09-17 1995-03-23 Wacker Chemie Gmbh Strahlungsheizkörper, insbesondere zum Beheizen einer glaskeramischen Kochplatte
GB2324693A (en) * 1997-04-12 1998-10-28 Ceramaspeed Ltd Vapour barrier in a radiant electric heater

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DE2729930A1 (de) * 1977-07-02 1979-01-11 Karl Fischer Strahlungs-heizeinheit fuer glaskeramik-elektrokochgeraete
EP0031514A1 (fr) * 1979-12-14 1981-07-08 E.G.O. Elektro-Geräte Blanc u. Fischer Radiateur de chauffage électrique ainsi que procédé et dispositif pour sa fabrication
EP0041203A1 (fr) * 1980-05-29 1981-12-09 Grünzweig + Hartmann und Glasfaser AG Dispositif pour loger de façon thermiquement isolée une hélice chauffante électrique, en particulier pour une plaque de cuisson chauffée par rayonnement et procédé pour sa fabrication
EP0071048A1 (fr) * 1981-07-24 1983-02-09 E.G.O. Elektro-Geräte Blanc u. Fischer Elément de chauffage électrique par radiation et procédé pour sa fabrication

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ATE26057T1 (de) * 1982-10-20 1987-04-15 Elpag Ag Chur Elektrische heizeinrichtung fuer herde oder kochplatten.
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DE3315438A1 (de) * 1983-04-28 1984-10-31 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Heizelement zur beheizung von koch-, heizplatten oder dgl.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2729930A1 (de) * 1977-07-02 1979-01-11 Karl Fischer Strahlungs-heizeinheit fuer glaskeramik-elektrokochgeraete
EP0031514A1 (fr) * 1979-12-14 1981-07-08 E.G.O. Elektro-Geräte Blanc u. Fischer Radiateur de chauffage électrique ainsi que procédé et dispositif pour sa fabrication
EP0041203A1 (fr) * 1980-05-29 1981-12-09 Grünzweig + Hartmann und Glasfaser AG Dispositif pour loger de façon thermiquement isolée une hélice chauffante électrique, en particulier pour une plaque de cuisson chauffée par rayonnement et procédé pour sa fabrication
EP0071048A1 (fr) * 1981-07-24 1983-02-09 E.G.O. Elektro-Geräte Blanc u. Fischer Elément de chauffage électrique par radiation et procédé pour sa fabrication

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Publication number Publication date
ATE65150T1 (de) 1991-07-15
EP0189108A1 (fr) 1986-07-30
DE3502497A1 (de) 1986-07-31
DE3680120D1 (de) 1991-08-14

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