EP0276644A1 - Flaches elektrisches Heizelement - Google Patents

Flaches elektrisches Heizelement Download PDF

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Publication number
EP0276644A1
EP0276644A1 EP8787870177A EP87870177A EP0276644A1 EP 0276644 A1 EP0276644 A1 EP 0276644A1 EP 8787870177 A EP8787870177 A EP 8787870177A EP 87870177 A EP87870177 A EP 87870177A EP 0276644 A1 EP0276644 A1 EP 0276644A1
Authority
EP
European Patent Office
Prior art keywords
sheets
support
element according
heating element
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.)
Withdrawn
Application number
EP8787870177A
Other languages
English (en)
French (fr)
Inventor
André Dubois
Daniel Mormont
Bernard Contzen
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.)
Compagnie Royale Asturienne des Mines
Original Assignee
Compagnie Royale Asturienne des Mines
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
Priority claimed from BE0/217558A external-priority patent/BE905985A/fr
Priority claimed from BE8700289A external-priority patent/BE1000397A4/fr
Application filed by Compagnie Royale Asturienne des Mines filed Critical Compagnie Royale Asturienne des Mines
Publication of EP0276644A1 publication Critical patent/EP0276644A1/de
Withdrawn legal-status Critical Current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
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/28—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material
    • H05B3/286—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material the insulating material being an organic material, e.g. plastic
    • 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
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/28—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material
    • H05B3/283—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material the insulating material being an inorganic material, e.g. ceramic
    • 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
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/28—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material
    • H05B3/30—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material on or between metallic plates

Definitions

  • the present invention relates to a flat electric heating element, its manufacturing process, as well as heating devices equipped with such elements.
  • the invention can be applied to industrial heaters, domestic heaters and household appliances equipped with a heater.
  • the present invention aims to coat without play in an insulating material a tape or a trace of electrically conductive material, in order to obtain a product of very high mechanical strength.
  • Another object of the invention is a product whose temperature of the electrically conductive layer can reach high values; (incadescence to dark red or more).
  • the material of the insulating support and of the covering must be transparent to infrared and red rays.
  • a material is for example mica in its different appearances: muscovite, phlogopite, vermiculite.
  • the impregnant will also have this quality.
  • silicone varnishes Silicone varnishes can be used, despite the fact that they partially decompose at high temperature. In fact, their non-volatile decomposition products retain a suitable consistency and keep their quality of electrical insulation and mechanical protection.
  • the insulating support sheet can be covered on one side with a conductive trace or can be used as a flat core for winding a thin, electrically conductive tape.
  • the conductive trace can be obtained for example by cutting a metal strip by chemical, electrochemical, mechanical, or by laser beam.
  • the choice of the type of strip depends on the temperature that the electrically conductive material can take and can be, for example, copper, aluminum, steel or a ferro-nickel or nickel-chromium alloy.
  • the basic insulating material is preferably constituted by mineral fibers or flakes, for example: asbestos, fiberglass, rock wool, mica paper.
  • the binder can be of the mineral type, for example an alkali salt based on silicate, phosphate, borate or borophosphate, in particular potassium silicate or soluble glass.
  • thermosetting silicone resin producing a polymerized assembly of flexible quality or of rigid quality.
  • a metal resistor 1 is coated on each side with one or more layers of mica paper 2, impregnated with a silicone resin.
  • the number of these layers, usually two, is defined according to the required electrical insulation and mechanical strength.
  • the impregnator is not or is not completely polymerized. The final polymerization takes place in a press at a suitable temperature and thus ensures excellent homogeneity of the assembly, guaranteeing a long service life of the heating element.
  • sheets of mica paper are placed on either side of a cut metal circuit and the assembly is impregnated in a bath of silicone resin or a bath of potassium silicate. The cohesion and the other properties of the assembly are then obtained by hot pressing.
  • the resistant strip is coated on two thicknesses of mica paper impregnated with a silicone resin.
  • the assembly is then partially polymerized according to an adequate pressure and temperature cycle.
  • the resistive circuit is then cut chemically, the micanite acting as a mechanical support.
  • two layers of mica paper, impregnated with the same resin, are placed on the resistant line, and the whole is made homogeneous by a second baking cycle, bringing about complete polymerization.
  • a flat electric heating element consists of a heat distribution sole 3, a support 4, a conductive layer 5, and a covering of vermiculite paper. 6 disposed between the conductive layer 5 and a rear support wall 7.
  • the vermiculite undergoes an expansion which can reach ten times its initial volume. Thanks to this effect, the conductive layer and its support are pressed against the sole 3, which guarantees excellent thermal contact between this sole and the conductive layer, while between the conductive layer 5 and the rear support wall 7, a suitable thickness of heat insulation prevents heat loss to this rear support wall 7.
  • FIG. 3 A third example is shown in FIG. 3.
  • a cardboard support of mica 8 serves as a winding mandrel for a thin metallic ribbon 9.
  • This support and the ribbon 9 are covered on either side by two covering sheets 10.
  • the whole is joined together in a press during a polymerization cycle of the silicone resin with which the support 8 and the sheets 10 are impregnated.
  • the excellent solidity of the assembly is conditioned by the fact of the homogeneity of the insulating material which is the same on both sides of the electrical resistance and which is produced, in particular by the bonds which are formed, thanks to hardening under pressure. , through the interstices of the resistant line of the filiform resistant layer. The connections through these interstices are facilitated by the fact that the thickness of the resistant layer is always very small, generally, substantially less than 0.1 mm.
  • heating elements can be envisaged in devices dissipating heat mainly by radiation, for example in toasters and radiant heating devices.
  • the particular advantage of these heating elements is the fact that the heating conductors, even incandescent, are covered with an electrically insulating and mechanically resistant layer, both in the cold state and in the hot state. Any accidental contact of an electrical conductor with a metal utensil, for example a fork, is thus excluded.
  • a reflective layer for example obtained by evaporation under vacuum of a refractory metal or simply by bonding using a silicone resin a thin strip of silver, nickel or chrome. Such a measure greatly reduces the dissipation of heat on the side of the reflective layer.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Surface Heating Bodies (AREA)
  • Resistance Heating (AREA)
EP8787870177A 1986-12-19 1987-12-15 Flaches elektrisches Heizelement Withdrawn EP0276644A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
BE905985 1986-12-19
BE0/217558A BE905985A (fr) 1986-12-19 1986-12-19 Elements chauffants plats.
BE8700289 1987-03-20
BE8700289A BE1000397A4 (fr) 1987-03-20 1987-03-20 Elements plats de chauffage electrique.

Publications (1)

Publication Number Publication Date
EP0276644A1 true EP0276644A1 (de) 1988-08-03

Family

ID=25655152

Family Applications (1)

Application Number Title Priority Date Filing Date
EP8787870177A Withdrawn EP0276644A1 (de) 1986-12-19 1987-12-15 Flaches elektrisches Heizelement

Country Status (2)

Country Link
EP (1) EP0276644A1 (de)
WO (1) WO1988004874A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2745147A1 (fr) * 1996-02-19 1997-08-22 Eco Tan Ltd Element chauffant a resistance electrique
WO1999065279A1 (en) * 1998-06-08 1999-12-16 Dualit Limited Electric cooking and toasting apparatus and electric elements therefor
WO2000033615A1 (en) * 1998-12-02 2000-06-08 Dualit Limited Electric cooking and toasting apparatus and electric elements therefor
GB2436194A (en) * 2006-03-17 2007-09-19 Gkn Aerospace Transparency Sys A method of making an impregnated heater structure and an impregnated heater structure

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1002726A3 (fr) * 1989-01-04 1991-05-21 Asturienne Mines Comp Royale Element de chauffage.

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR927572A (fr) * 1944-01-03 1947-11-03 Procédé de fabrication de radiateurs électriques à résistances noyées
FR2061161A5 (de) * 1969-09-11 1971-06-18 Matsushita Electric Ind Co Ltd
FR2395661A2 (fr) * 1977-06-23 1979-01-19 Rhone Poulenc Ind Elements de chauffage
DE3013778A1 (de) * 1980-04-10 1981-10-15 I.G. Bauerhin GmbH elektro-technische Fabrik, 6466 Gründau Buegelpresse zur einbindung eines heizleiters
US4474841A (en) * 1983-09-30 1984-10-02 Kerekes Peter S Heat-radiant paper laminate panel and method of forming
EP0127226A2 (de) * 1983-05-31 1984-12-05 Société Anonyme Compagnie Générale Belge des Isolants (COGEBI) Verfahren zur Herstellung von elektrischen Widerständen und Heizapparaten
EP0202969A1 (de) * 1985-04-19 1986-11-26 Seb S.A. Flaches Heizelement mit elektrischem Widerstand und mit einem derartigen Element ausgerüsteter Heizartikel
EP0204185A1 (de) * 1985-05-30 1986-12-10 E.G.O. Elektro-Geräte Blanc u. Fischer Strahlungs-Heizeinheit

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR927572A (fr) * 1944-01-03 1947-11-03 Procédé de fabrication de radiateurs électriques à résistances noyées
FR2061161A5 (de) * 1969-09-11 1971-06-18 Matsushita Electric Ind Co Ltd
FR2395661A2 (fr) * 1977-06-23 1979-01-19 Rhone Poulenc Ind Elements de chauffage
DE3013778A1 (de) * 1980-04-10 1981-10-15 I.G. Bauerhin GmbH elektro-technische Fabrik, 6466 Gründau Buegelpresse zur einbindung eines heizleiters
EP0127226A2 (de) * 1983-05-31 1984-12-05 Société Anonyme Compagnie Générale Belge des Isolants (COGEBI) Verfahren zur Herstellung von elektrischen Widerständen und Heizapparaten
US4474841A (en) * 1983-09-30 1984-10-02 Kerekes Peter S Heat-radiant paper laminate panel and method of forming
EP0202969A1 (de) * 1985-04-19 1986-11-26 Seb S.A. Flaches Heizelement mit elektrischem Widerstand und mit einem derartigen Element ausgerüsteter Heizartikel
EP0204185A1 (de) * 1985-05-30 1986-12-10 E.G.O. Elektro-Geräte Blanc u. Fischer Strahlungs-Heizeinheit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2745147A1 (fr) * 1996-02-19 1997-08-22 Eco Tan Ltd Element chauffant a resistance electrique
WO1999065279A1 (en) * 1998-06-08 1999-12-16 Dualit Limited Electric cooking and toasting apparatus and electric elements therefor
US6297477B1 (en) 1998-06-08 2001-10-02 Dualit Limited Electric cooking and toasting apparatus and electric elements therefor
WO2000033615A1 (en) * 1998-12-02 2000-06-08 Dualit Limited Electric cooking and toasting apparatus and electric elements therefor
US6417492B1 (en) 1998-12-02 2002-07-09 Dualit Limited Electric cooking and toasting apparatus and electric elements therefor
AU754085B2 (en) * 1998-12-02 2002-11-07 Dualit Limited Electric cooking and toasting apparatus and electric elements therefor
GB2436194A (en) * 2006-03-17 2007-09-19 Gkn Aerospace Transparency Sys A method of making an impregnated heater structure and an impregnated heater structure

Also Published As

Publication number Publication date
WO1988004874A1 (fr) 1988-06-30

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