EP0041203B2 - 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 - Google Patents

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 Download PDF

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Publication number
EP0041203B2
EP0041203B2 EP81103958A EP81103958A EP0041203B2 EP 0041203 B2 EP0041203 B2 EP 0041203B2 EP 81103958 A EP81103958 A EP 81103958A EP 81103958 A EP81103958 A EP 81103958A EP 0041203 B2 EP0041203 B2 EP 0041203B2
Authority
EP
European Patent Office
Prior art keywords
layer
insulating
bedding
heat
heating spiral
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.)
Expired
Application number
EP81103958A
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German (de)
English (en)
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EP0041203A1 (fr
EP0041203B1 (fr
Inventor
Hans Kummermehr
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.)
Micropore International Ltd
Original Assignee
Gruenzweig und Hartmann und Glasfaser AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Application filed by Gruenzweig und Hartmann und Glasfaser AG filed Critical Gruenzweig und Hartmann und Glasfaser AG
Priority to AT81103958T priority Critical patent/ATE9255T1/de
Publication of EP0041203A1 publication Critical patent/EP0041203A1/fr
Publication of EP0041203B1 publication Critical patent/EP0041203B1/fr
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Publication of EP0041203B2 publication Critical patent/EP0041203B2/fr
Expired legal-status Critical Current

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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
    • H05B3/74—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 device for the heat-insulating mounting of an electric heating coil, in particular for a radiation-heated hotplate, according to the preamble of claim 1 and a method which is particularly suitable for its production.
  • the insulation layer based on silica airgel is in this known device as the only heat insulation layer between the heating coil and the bottom of the receptacle made of sheet metal, so that the excellent thermal insulation properties of this special thermal insulation material are optimally utilized .
  • Adequate temperature resistance in the immediate vicinity of the heating coil, which lies directly on the insulation layer, is sought by adding aluminum oxide, which counteracts sintering of the silica airgel at temperatures above about 700 ° C .; aluminum oxide in the form of reinforcing fibers or as an additional admixture can be present in an amount of up to 12% in the insulating material based on silicic acid airgel.
  • Materials for opacifiers are manganese dioxide, titanium dioxide and zirconium oxide.
  • Insulation material of this type has an extremely high thermal resistance, but is not mechanically stable, since it tends to crumble or crumble in the area of already low voltage peaks.
  • DE-B-2339 768 is based on the preamble of claim 1.
  • the shaped body for storing the heating coil can be produced as an inexpensive pressed part which only has to be inserted into the receiving shell, which already contains material of the thermal barrier layer pressed directly against the bottom of the receiving shell.
  • a radiation-heated hotplate is known, the electric heating coil of which is mounted on an insulating support in the form of a disk made of a cardboard-like material, a mechanically perfect and vibration-proof mounting of the electrical heating resistors being ensured on the cardboard-like material.
  • the insulating support formed in this way is in turn mounted on insulating layers or disks, the lower insulating layer in particular being able to have low mechanical strength, for example consisting of a non-or only slightly compressed bulk material, for example finely divided silica.
  • this known device results in the construction with a bottom-side, mechanically less solid, but good thermal insulation layer, for example based on silica airgel, and above that a special mechanically stronger bearing layer for supporting the heating coil.
  • the material of the fixed bearing layer makes only a minor contribution to thermal insulation and thus increases the overall height of the positioning device above the effective thermal barrier layer.
  • the invention has for its object to provide a device of the type specified in the preamble of claim 1, which has both excellent thermal insulation properties with a low overall height, as well as a structurally simple and reliable position securing of the heating coil.
  • the insulation layer can of course also be hardened accordingly, since this increases its mechanical resistance, for example for effective edge protection, albeit at the cost of a slight decrease in thermal insulation capacity; however, since the insulation layer does not need to have the mechanical resistance of the bearing layer, the insulation layer is often not hardened.
  • a base material based on pyrogenic aluminum oxide should be preferred instead of pyrogenic silica, since pyrogenic silica gives somewhat better thermal insulation properties, but material based on aluminum oxide airgel is also considerably more temperature-resistant without additional measures.
  • high-temperature resistant materials such as manganese oxide, titanium oxide or zirconium oxide can be introduced into the insulating material of the bearing layer in order to further increase the temperature resistance if necessary.
  • the device according to the invention thus consists of the receptacle, for example in the form of a sheet metal bowl, the thermal insulation panel to form the thermal insulation material consisting of the insulating layer and the bearing layer, and the heating coil, which is mounted directly on the bearing layer of the thermal insulation panel.
  • the thermal insulation board can be prefabricated in a cost-effective manner, for which purpose one of the layers - the insulation layer or the bearing layer - is pressed from amorphous powder of the desired consistency to achieve pressure fixation, then the material of the other layer is applied and applied to the pre-pressed layer under higher pressure is finished pressed, whereupon the curing can take place with suitable heating.
  • thermal insulation board as a molded part also enables the application of helical grooves to the top of the bearing layer, into which the heating coil can be glued with a high-temperature-resistant inorganic adhesive, as well as a trough-shaped design of this area of the bearing layer with circumferential peripheral edge, without any additional effort. which, due to the mechanical strength of the material of the bearing layer, can directly form the contact surface for the glass ceramic cover of the hotplate, so that a separate spacer ring can be dispensed with in a cost-effective manner.
  • the illustrated device consists essentially of a receptacle 1 made of metal, in particular aluminum sheet, and thermal insulation material in the form of a thermal insulation panel 2, which is arranged on the inside of a 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 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 22 and thus receiving a distance from the upper edge of the peripheral wall 3 of the receiving shell 1 and from the heating coil 5.
  • the device is essentially circular in plan view and is concentric with a central axis 14.
  • the thermal insulation panel 2 consists of an upper bearing layer 7, which receives the heating coil 5 in helical grooves 8.
  • an insulating layer 9 is provided, which abuts the bottom 4 of the receiving shell 1 and consists of fine-pored silica airgel.
  • This material is known per se and, in addition to the silica airgel, generally has a mineral fiber reinforcement and / or an opacifying agent;
  • Such highly effective thermal insulation materials are marketed by the patent owner under the name MINILEIT (registered trademark), whereby for details of the material reference is made to the relevant DE-Osen 2747 663, 2748 307 and 2754 956, to which reference is expressly made.
  • a material for the insulating layer 9 is preferably used, which consists of 30 to 50% fumed silica, 20 to 50% opacifying agent and 5 to 15% aluminum fibers, and is in a density of 200 to 400 kg / m 3 , but not organic or needs to be inorganic hardened.
  • Such a special thermal insulation material has a thermal conductivity that is lower than still air and is also only slightly temperature-dependent.
  • the plates pressed from powdery raw materials made of such a material are mechanically less resistant and difficult to manufacture. For this reason, panels made of this material are usually surrounded by a solid glass fabric during production and subsequently cut to the desired shape.
  • the upper bearing layer 7 consists of an aluminum oxide airgel instead of the silica airgel of the insulation layer 9, or a suitable mixture of both aerogels.
  • Such insulation material based on aluminum oxide airgel is more resistant to higher temperatures than on the basis of silica airgel.
  • the bearing layer 7 can contain additives to high-temperature-resistant materials such as manganese oxide, zirconium oxide or titanium oxide, if required, to further increase the temperature resistance.
  • the material of the bearing layer 7 is hardened with an inorganic binder, for example with suitable glass-forming substances, as is known per se from the earlier patent application EP-A-0 027 264 (prior art according to Art.
  • the material of the bearing layer 7 has only slightly poorer thermal insulation properties than that of the insulating layer 9, but is mechanically considerably stronger and more resistant, so that securing the position of the heating coil 5 directly on the bearing layer 7 no longer poses any problems.
  • metal wire clips holding the heating coil 5 could be inserted into the material of the bearing layer 7, the grooves 8 not being absolutely necessary, but it is preferred to fix the heating coil 5 in helical grooves 8 by means of a high-temperature-resistant inorganic adhesive 6, adhesive with a Temperature resistance up to 1 150 ° C, so completely sufficient, are available.
  • the bearing surfaces 22 can be formed directly on the upper side of a peripheral edge 10, which in the illustrated manner surrounds a trough in the bearing layer 7 for receiving the heating coil 5 on the circumference and thus radiates heat to the peripheral wall 3 of the receiving shell 1 safely avoids.
  • the material in the upper end area 11 of the peripheral edge 10 can be additionally compressed.
  • the thermal insulation board 2 from the lower insulation layer 9 and the upper bearing layer 7 together with grooves 8 and peripheral edge 10 with a bearing surface 22 can be produced as a one-piece pressed part.
  • the powdery material of one of the layers 7 or 9 is first introduced into a press mold and pre-pressed for fixing the pressure, the pressure should be below 25 bar and a pressure of 15 to 20 bar being preferred; good results were obtained at a pressure of 18 bar.
  • the material of the other layer 9 or 7 is added and the blank for the entire thermal insulation board 2 is pressed in one go under a higher pressure of more than 25 bar, in particular at a pressure between 25 and 40 bar; good results were achieved with a pressure of 30 bar.
  • the bearing layer 7 is first pressed in the reverse position and remains in this position for the final pressing.
  • the blank for the thermal insulation board 2 is expediently pressed in the position turned over relative to the operating position, since then an easier filling of the relief-like bottom of the press chamber is possible, which corresponds to the negative of the bearing trough of the bearing layer 7 for the heating winding 5.
  • the edge stamp for the recompression then presses against the support surface 22 on the blank from below.
  • the finished thermal insulation panel 2 can be removed at about 700 ° for 20 to 30 minutes.
  • the molded body forming the thermal insulation board 2 has sufficient stability due to the hardening of the bearing layer 7, the more susceptible free edge of the insulating layer 9 being protected against breakage by the rounding corresponding to the rounding between the peripheral wall 2 and the bottom 4 of the receiving shell 1. Therefore, the thermal insulation board 2 can be shipped and assembled without great risk of damage, and is of course tradable independently. Two concrete examples are given below for the material of the bearing layer 7 or the insulating layer 9.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Thermal Insulation (AREA)
  • Resistance Heating (AREA)

Claims (14)

1. Dispositif de support calorifuge d'un filament chauffant électrique, en particulier pour une plaque de cuisson chauffée par rayonnement, avec une coque (1) de logement du matériau calorifuge disposé entre le filament chauffant (5) et la base (4) de la coque (1), et comportant du côté de la base une couche isolante (9) très efficace en aérogel de silice microporeux, avec en particulier un renforcement par fibre minérale et/ou des agents opacifiants, ainsi que, entre le filament chauffant (5) et la couche isolante (9), une couche support (7) du filament chauffant (5), de consistance différente de celle de la couche isolante (9), caractérisé en ce que la couche support est constituée d'un matériau isolant particulaire, microporeux, produit par pyrolyse ignée, ce matériau étant durci par un liant minéral et présentant en plus, de préférence, un renforcement par fibre minérale et/ou des agents opacifiants.
2. Dispositif selon revendication 1, caractérisé en ce que le matériau isolant de la couche support (7) contient ou est de l'alumine pyrogène.
3. Dispositif selon une des revendications 1 ou 2, caractérisé en ce que le matériau isolant de la couche support (7) est enrichi par des matériaux résistant à haute température, tels en particulier qu'oxyde de manganèse, oxyde de titane ou zircone.
4. Dispositif selon une quelconque des revendications 1 à 3, caractérisé en ce que la face supérieure de la couche support (7) présente des gorges hélicoïdales (8) pour le logement du filament chauffant (5), qui est fixé dans lesdites gorges au moyen d'une colle minérale (6) résistant à haute température.
5. Dispositif selon une quelconque des revendications 1 à 4, caractérisé en ce que la couche support (7) présente un bord circonférentiel (10) monobloc, en saillie sur le plan du filament chauffant (5).
6. Dispositif selon revendication 5, caractérisé en ce que la face supérieure du bord circonférentiel (10) constitue directement une face d'appui (22) pour le revêtement vitrocéramique classique ou autre de la plaque de cuisson.
i. Dispositif selon une des revendications 5 ou 6, caractérisé en ce que la zone d'extrémité supérieure (11) du bord circonférentiel (10) est en outre densifiée.
8. Dispositif selon une des revendications précédentes, caractérisé en ce que le matériau calorifuge se présente sous la forme d'une plaque calorifuge (2) séparée, comportant deux couches.
9. Procédé de production d'un dispositif selon revendication 8, caractérisé en ce que le matériau d'une couche de la plaque calorifuge (2) est précomprimé; la couche ainsi précomprimée est soumise avec le matériau de la seconde couche à la compression finale sous une pression supérieure à celle de précompression; et la couche support de l'ébauche comprimée est durcie thermiquement.
10. Procédé selon revendication 9, caractérisé en ce que la couche précomprimée est la couche support.
11. Procédé selon une des revendications 9 ou 10, caractérisé en ce que la précompression s'effectue sous une pression inférieure à 25 bars, et de préférence comprise entre 15 et 20 bars, et notamment d'environ 18 bars, et la compression finale sous une pression supérieure à 25 bars, de préférence comprise entre 25 et 40 bars, et notamment d'environ 30 bars.
12. Procédé selon une quelconque des revendications 9 à 11, caractérisé en ce que le rebord circonférentiel est recomprimé sous pression plus élevée pendant la compression finale.
13. Procédé selon une quelconque des revendications 9 à 12, caractérisé en ce que la couche support est disposée au-dessous de la couche isolante pendant le pressage final.
14. Procédé selon revendications 10 et 13, caractérisé en ce que la couche support est précomprimée avec l'auge de logement et le rebord circonférentiel dirigés vers le bas; le matériau de la couche isolante est ensuite introduit, puis comprimé contre la face supérieure de la couche isolante inversée.
EP81103958A 1980-05-29 1981-05-22 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 Expired EP0041203B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81103958T ATE9255T1 (de) 1980-05-29 1981-05-22 Vorrichtung zur waermedaemmenden lagerung einer elektrischen heizwendel, insbesondere fuer eine strahlungsbeheizte kochplatte, sowie waermedaemmplatte hierzu und verfahren zu ihrer herstellung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3020326 1980-05-29
DE3020326A DE3020326C2 (de) 1980-05-29 1980-05-29 Strahlungsheizkörper mit einer elektrischen Heizwendel, insbesondere für eine Glaskeramik-Kochplatte

Publications (3)

Publication Number Publication Date
EP0041203A1 EP0041203A1 (fr) 1981-12-09
EP0041203B1 EP0041203B1 (fr) 1984-09-05
EP0041203B2 true EP0041203B2 (fr) 1988-06-08

Family

ID=6103462

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81103958A Expired EP0041203B2 (fr) 1980-05-29 1981-05-22 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

Country Status (3)

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EP (1) EP0041203B2 (fr)
AT (1) ATE9255T1 (fr)
DE (1) DE3020326C2 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3102935A1 (de) * 1981-01-29 1982-09-02 Grünzweig + Hartmann und Glasfaser AG, 6700 Ludwigshafen Vorrichtung zur waermedaemmenden lagerung einer elektrischen heizwendel, insbesondere fuer eine strahlungsbeheizte kochplatte, sowie waermedaemmplatte hierzu und verfahren zu ihrer herstellung
DE3144661A1 (de) * 1981-11-10 1983-05-19 Wacker-Chemie GmbH, 8000 München Heizplatte
DE3219392A1 (de) * 1982-05-24 1983-12-01 Gruenzweig Hartmann Glasfaser Waermedaemmplatte fuer die lagerung einer elektrischen heizwendel, sowie verfahren zu ihrer herstellung
DE3275804D1 (en) * 1982-10-20 1987-04-23 Elpag Ag Chur Electric heating device for ranges or cooking plates
DE3502497A1 (de) * 1985-01-25 1986-07-31 Grünzweig + Hartmann und Glasfaser AG, 6700 Ludwigshafen Heizvorrichtung, insbesondere fuer eine strahlungsbeheizte kochplatte, sowie verfahren zu ihrer herstellung
DE3800676A1 (de) * 1988-01-13 1989-07-27 Eichenauer Gmbh & Co Kg F Heizvorrichtung, insbesondere als kochplatte
DE3935031A1 (de) * 1989-10-20 1991-04-25 Wacker Chemie Gmbh Strahlungsheizeinheit
DE4202569C2 (de) * 1992-01-30 1995-09-21 Porotherm Daemmstoffe Gmbh Formwerkzeuge zum Pressen von Dämmschalen
DE4322941C1 (de) * 1993-07-09 1995-01-12 Porextherm Daemmstoffe Gmbh Wärmedämmkörper und Verfahren zu dessen Herstellung
DE4331702A1 (de) * 1993-09-17 1995-03-23 Wacker Chemie Gmbh Strahlungsheizkörper, insbesondere zum Beheizen einer glaskeramischen Kochplatte
GB2323507B (en) * 1997-03-21 2000-11-29 Ceramaspeed Ltd Electric heater unit and method of manufacture
US6150643A (en) * 1999-06-08 2000-11-21 Koyo Thermo Systems Co., Ltd. Insulating material, electrical heating unit employing same, and manufacturing method therefor
GB2357232A (en) * 1999-09-29 2001-06-13 Ceramaspeed Ltd Further insulating dish/insulation interface in an electric heater
PT107101A (pt) 2013-08-02 2015-02-02 Univ De Coimbra Painéis flexíveis de aerogel hidrofóbico reforçado com feltro de fibras

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US2808338A (en) * 1952-12-18 1957-10-01 Johns Manville Thermal insulating bodies and method of manufacture
US2811457A (en) * 1952-12-18 1957-10-29 Johns Manville Inorganic bonded thermal insulating bodies and method of manufacture
US3055831A (en) * 1961-09-25 1962-09-25 Johns Manville Handleable heat insulation shapes
US3636309A (en) * 1970-11-19 1972-01-18 Gen Motors Corp Ceramic-top cooking assembly fracture detector
CH544044A (de) * 1971-10-26 1973-11-15 Bolliger Werner Verfahren zur Herstellung einer Brandschutzfolie
DE2165569C3 (de) * 1971-12-30 1986-05-28 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Elektrokochgerät mit einer oberen Platte aus hochwärmebeständigem glasartigem bzw. keramischem Material
GB1433478A (en) * 1972-08-05 1976-04-28 Mcwilliams J A Electrical heating apparatus
DE2500586A1 (de) * 1975-01-09 1976-07-15 Ego Elektro Blanc & Fischer Elektrokochgeraet
DE2551137C2 (de) * 1975-11-14 1986-04-24 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Elektrischer Strahlungsheizkörper für Glaskeramikkochplatten
DE2729930C2 (de) * 1977-07-02 1993-02-18 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Verfahren zur Herstellung eines elektrischen Strahlungs-Heizelementes
GB1580909A (en) * 1977-02-10 1980-12-10 Micropore Internatioonal Ltd Thermal insulation material
ZA774922B (en) * 1977-03-09 1978-06-28 Emerson Electric Co Open coil heater
DE2748307C2 (de) * 1977-10-27 1982-06-09 Grünzweig + Hartmann und Glasfaser AG, 6700 Ludwigshafen Wärmedämmplatte und Verfahren zu ihrer Herstellung
DE2804407C3 (de) * 1978-02-02 1980-12-04 Kueppersbusch Ag, 4650 Gelsenkirchen Speicherheizplatte
DE2812247B2 (de) * 1978-03-21 1981-06-19 Ako-Werke Gmbh & Co., 7988 Wangen Elektrische Kochplatte
DE2820139A1 (de) * 1978-05-09 1979-11-15 Karl Fischer Elektrischer heizkoerper
DE2946476A1 (de) * 1979-11-17 1981-05-27 Consortium für elektrochemische Industrie GmbH, 8000 München Waermedaemmformkoerper und verfahren zu seiner herstellung

Also Published As

Publication number Publication date
EP0041203A1 (fr) 1981-12-09
DE3020326A1 (de) 1981-12-03
ATE9255T1 (de) 1984-09-15
DE3020326C2 (de) 1985-12-19
EP0041203B1 (fr) 1984-09-05

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