EP0041203A1 - 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
EP0041203A1
EP0041203A1 EP81103958A EP81103958A EP0041203A1 EP 0041203 A1 EP0041203 A1 EP 0041203A1 EP 81103958 A EP81103958 A EP 81103958A EP 81103958 A EP81103958 A EP 81103958A EP 0041203 A1 EP0041203 A1 EP 0041203A1
Authority
EP
European Patent Office
Prior art keywords
layer
heating coil
bearing layer
thermal insulation
insulating
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.)
Granted
Application number
EP81103958A
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German (de)
English (en)
Other versions
EP0041203B1 (fr
EP0041203B2 (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
Grunzweig und Hartmann und Glasfaser AG
Gruenzweig und Hartmann 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 Grunzweig und Hartmann und Glasfaser AG, Gruenzweig und Hartmann AG filed Critical Grunzweig 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
Application granted granted Critical
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 to a heat-insulating plate which is particularly suitable for use with the device and a method which is particularly suitable for its production.
  • a device of this type is known for example from DE-OS 28 06 367.
  • the insulation layer based on silica airgel is introduced 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 contained in an amount of up to 12% in the insulating material based on silica 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. Therefore, all edges must be protected, for which purpose a separate spacer ring between the lower surface of the glass ceramic cover of the hotplate and the upper contact surface of the insulating material is used. In particular, the attachment of the heating coil on this material is difficult.
  • metal wire clips are provided for this purpose, which are inserted into the insulating material. By working the heating coil during operation, these metal wire clips loosen after only a few heating cycles and cannot form an adequate anchorage.
  • the insulating layer on the basis of fine-pored silica airgel only in the base region of the receiving shell and, above it, a molded body made of temperature-resistant and in particular mechanically stable material, for example aluminum silicate bonded with inorganic adhesive to provide for the clean storage of the heating coil.
  • this material has poorer thermal insulation, so that the overall height of the device increases somewhat compared to using only the material of the insulating layer.
  • 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 insulation layer pressed directly against the bottom of the receiving shell.
  • the invention has for its object to provide a device of the type specified in the preamble of claim 1 and a thermal insulation panel for forming the thermal insulation material for this purpose, 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 device according to the invention thus consists of the receptacle, for example in the form of a sheet metal bowl, the heat insulation plate for forming the heat insulation material consisting of the insulation layer and the bearing layer, and the heating coil which is mounted directly on the bearing layer of the heat insulation plate.
  • 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 out of amorphous powder of the desired consistency in order to achieve pressure fixation, then the material of the other layer is applied and with the pre-pressed layer under higher pressure is finished pressed, whereupon the curing can take place under suitable heat.
  • the production of the thermal insulation board as a press-molded part also enables the installation of helical grooves on the top without any additional effort the bearing layer, into which the heating coil can be glued with a high-temperature-resistant inorganic adhesive, and a trough-shaped design of this area of the bearing layer with a circumferential peripheral edge, which can directly form the contact surface for the glass ceramic cover of the hotplate due to the mechanical strength of the material of the bearing layer, 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 peripheral wall 3 of the receiving shell 1 and thus the entire device has an essentially circular shape in plan view and is concentric with a central axis 14.
  • the thermal insulation board 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 lies against 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 sold by the applicant under the name MINILEIT (registered trademark), reference being made to the relevant DE-OSes 27 47 663, 27 48 307 and 27 54 956 for details of the material, to which reference is expressly made is taken.
  • a material for the insulation layer 9 which consists of 30 to 50% fumed silica, 20 to 50% opacifying agent and 5 to 15% aluminum fibers, and is present in a density of 200 to 40 0 kg / m 3 , but not organically or needs to be inorganic hardened.
  • 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 from 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 aeregels.
  • Such insulating material on the basis of aluminum oxide airgel is resistant to higher temperatures than on the basis of silica airgel.
  • the bearing layer 7 can, if necessary, further increase the temperature resistance contain high temperature resistant materials such as manganese oxide, zirconium oxide or titanium oxide.
  • 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 older German patent application P 29 42 087.9, to which for further details in connection with the hardening of such material explicit reference is made.
  • 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 1150 ° 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 circumference edge 10 with contact 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 is preferred; good results were achieved 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 recess of the bearing layer 7 for the heating winding 5.
  • the edge stamp for the recompression then presses from below against the bearing surface 22 on the blank.
  • the finished thermal insulation panel 2 can be removed.
  • the adhesive 6 needs to be introduced into the grooves 8 and the heating coil 5 inserted, after which the thermal insulation panel 2 with the heating coil is inserted into the receiving shell can be.
  • 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.
  • Material for the bearing layer 7 Material for the insulation layer 9 as example 1 .
  • the percentages relate to percentages by weight in the raw material mixture.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Thermal Insulation (AREA)
  • Resistance Heating (AREA)
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 true EP0041203A1 (fr) 1981-12-09
EP0041203B1 EP0041203B1 (fr) 1984-09-05
EP0041203B2 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)

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

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0057252A2 (fr) * 1981-01-29 1982-08-11 Grünzweig + Hartmann und Glasfaser AG Dispositif pour le logement d'une hélice de chauffage électrique isolée thermiquement, en particulier pour une plaque de cuisson chauffée par radiation, ainsi qu'une plaque d'isolation thermique utilisée à cette fin et procédé pour sa fabrication
EP0105968A1 (fr) * 1982-10-20 1984-04-25 Elpag Ag Chur Dispositif de chauffage électrique pour des fourneaux ou des plaques de cuisson
WO1991006193A1 (fr) * 1989-10-20 1991-05-02 Wacker-Chemie Gmbh Unite a chaleur radiante
EP0189108B1 (fr) * 1985-01-25 1991-07-10 Ceramaspeed Limited Dispositif de chauffage, en particulier une plaque de cuisson chauffée par radiation, ainsi que son procédé de fabrication
EP0866642A2 (fr) * 1997-03-21 1998-09-23 Ceramaspeed Limited Unité de chauffage électrique et méthode de production
EP1059500A1 (fr) * 1999-06-08 2000-12-13 Koyo Lindberg Limited Matériau d'isolation, unité de chauffage électrique l'utilisant et méthode pour sa fabrication
GB2357232A (en) * 1999-09-29 2001-06-13 Ceramaspeed Ltd Further insulating dish/insulation interface in an electric heater
WO2015016730A2 (fr) 2013-08-02 2015-02-05 Active Aerogels, Unipessoal, Lda. Procédé de production de panneau flexibles d'aérogel hydrophobe renforcé de feutres de fibres

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE3800676A1 (de) * 1988-01-13 1989-07-27 Eichenauer Gmbh & Co Kg F Heizvorrichtung, insbesondere als kochplatte
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

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3636309A (en) * 1970-11-19 1972-01-18 Gen Motors Corp Ceramic-top cooking assembly fracture detector
DE2165569A1 (de) * 1971-12-30 1973-07-05 Ego Elektro Blanc & Fischer Elektrokochgeraet mit einer oberen platte aus hochwaermebestaendigem glasartigem bzw. keramischem material
CH544044A (de) * 1971-10-26 1973-11-15 Bolliger Werner Verfahren zur Herstellung einer Brandschutzfolie
DE2500586A1 (de) * 1975-01-09 1976-07-15 Ego Elektro Blanc & Fischer Elektrokochgeraet
DE2729930A1 (de) * 1977-07-02 1979-01-11 Karl Fischer Strahlungs-heizeinheit fuer glaskeramik-elektrokochgeraete
FR2416614A1 (fr) * 1978-02-02 1979-08-31 Kueppersbusch Plaque chauffante a accumulation
EP0004302A1 (fr) * 1978-03-21 1979-10-03 AKO-Werke GmbH & Co Plaque de cuisson électrique
DE2820139A1 (de) * 1978-05-09 1979-11-15 Karl Fischer Elektrischer heizkoerper

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2811457A (en) * 1952-12-18 1957-10-29 Johns Manville Inorganic bonded thermal insulating bodies and method of manufacture
US2808338A (en) * 1952-12-18 1957-10-01 Johns Manville Thermal insulating bodies and method of manufacture
US3055831A (en) * 1961-09-25 1962-09-25 Johns Manville Handleable heat insulation shapes
GB1433478A (en) * 1972-08-05 1976-04-28 Mcwilliams J A Electrical heating apparatus
DE2551137C2 (de) * 1975-11-14 1986-04-24 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Elektrischer Strahlungsheizkörper für Glaskeramikkochplatten
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
DE2946476A1 (de) * 1979-11-17 1981-05-27 Consortium für elektrochemische Industrie GmbH, 8000 München Waermedaemmformkoerper und verfahren zu seiner herstellung

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE2165569A1 (de) * 1971-12-30 1973-07-05 Ego Elektro Blanc & Fischer Elektrokochgeraet mit einer oberen platte aus hochwaermebestaendigem glasartigem bzw. keramischem material
DE2500586A1 (de) * 1975-01-09 1976-07-15 Ego Elektro Blanc & Fischer Elektrokochgeraet
DE2729930A1 (de) * 1977-07-02 1979-01-11 Karl Fischer Strahlungs-heizeinheit fuer glaskeramik-elektrokochgeraete
FR2416614A1 (fr) * 1978-02-02 1979-08-31 Kueppersbusch Plaque chauffante a accumulation
EP0004302A1 (fr) * 1978-03-21 1979-10-03 AKO-Werke GmbH & Co Plaque de cuisson électrique
DE2820139A1 (de) * 1978-05-09 1979-11-15 Karl Fischer Elektrischer heizkoerper
FR2425786A1 (fr) * 1978-05-09 1979-12-07 Fischer Karl Corps de chauffe electrique

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0057252A2 (fr) * 1981-01-29 1982-08-11 Grünzweig + Hartmann und Glasfaser AG Dispositif pour le logement d'une hélice de chauffage électrique isolée thermiquement, en particulier pour une plaque de cuisson chauffée par radiation, ainsi qu'une plaque d'isolation thermique utilisée à cette fin et procédé pour sa fabrication
EP0057252A3 (fr) * 1981-01-29 1982-08-25 Grünzweig + Hartmann und Glasfaser AG Dispositif pour le logement d'une hélice de chauffage électrique isolée thermiquement, en particulier pour une plaque de cuisson chauffée par radiation, ainsi qu'une plaque d'isolation thermique utilisée à cette fin et procédé pour sa fabrication
EP0105968A1 (fr) * 1982-10-20 1984-04-25 Elpag Ag Chur Dispositif de chauffage électrique pour des fourneaux ou des plaques de cuisson
EP0189108B1 (fr) * 1985-01-25 1991-07-10 Ceramaspeed Limited Dispositif de chauffage, en particulier une plaque de cuisson chauffée par radiation, ainsi que son procédé de fabrication
WO1991006193A1 (fr) * 1989-10-20 1991-05-02 Wacker-Chemie Gmbh Unite a chaleur radiante
EP0866642A2 (fr) * 1997-03-21 1998-09-23 Ceramaspeed Limited Unité de chauffage électrique et méthode de production
EP0866642A3 (fr) * 1997-03-21 1999-01-27 Ceramaspeed Limited Unité de chauffage électrique et méthode de production
US6205648B1 (en) 1997-03-21 2001-03-27 Ceramaspeed Limited Electric heater unit and method of manufacture
EP1059500A1 (fr) * 1999-06-08 2000-12-13 Koyo Lindberg Limited Matériau d'isolation, unité de chauffage électrique l'utilisant et méthode pour sa fabrication
GB2357232A (en) * 1999-09-29 2001-06-13 Ceramaspeed Ltd Further insulating dish/insulation interface in an electric heater
WO2015016730A2 (fr) 2013-08-02 2015-02-05 Active Aerogels, Unipessoal, Lda. Procédé de production de panneau flexibles d'aérogel hydrophobe renforcé de feutres de fibres

Also Published As

Publication number Publication date
ATE9255T1 (de) 1984-09-15
DE3020326A1 (de) 1981-12-03
EP0041203B1 (fr) 1984-09-05
DE3020326C2 (de) 1985-12-19
EP0041203B2 (fr) 1988-06-08

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