EP0377425A1 - Heizelement - Google Patents

Heizelement Download PDF

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Publication number
EP0377425A1
EP0377425A1 EP89870217A EP89870217A EP0377425A1 EP 0377425 A1 EP0377425 A1 EP 0377425A1 EP 89870217 A EP89870217 A EP 89870217A EP 89870217 A EP89870217 A EP 89870217A EP 0377425 A1 EP0377425 A1 EP 0377425A1
Authority
EP
European Patent Office
Prior art keywords
heating element
flat
element according
support
electric heating
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Withdrawn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
EP89870217A
Other languages
English (en)
French (fr)
Inventor
Bernard Contzen
Vincent Estievenart
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
Application filed by Compagnie Royale Asturienne des Mines filed Critical Compagnie Royale Asturienne des Mines
Publication of EP0377425A1 publication Critical patent/EP0377425A1/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Withdrawn legal-status Critical Current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
    • H05B3/26—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
    • 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
    • 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
    • H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
    • 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
    • H05B2203/014—Heaters using resistive wires or cables not provided for in H05B3/54
    • 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 present invention relates to an electric heating element intended to be placed in industrial, domestic or household heating appliances, for example.
  • Flat heating elements which, for example, consist of one or more sheets of impregnated mica paper, of a flat electrical conductor and of one or more sheets of impregnated mica paper arranged on the second face of the electrical conductor.
  • the flat heating element tends to expand and there are areas in which the contact between the heating element and the surface to be heated is no longer intimate. This effect leads to a modification of the heat transfer mode: we go from conduction to radiation combined with convection. This locally leads to an increase in temperature of the flat heating element, which can lead to a thermal runaway phenomenon which leads to the destruction of the heating element or to alterations thereof such as the presence of cracks, folds or changes in color of the substrate.
  • heating and / or cooling sandwich panels are known, constituted by a light core allowing the accommodation of accessories and of two monolayer or multilayer skins, of which at least one monolayer skin or a layer multilayer skin consists of a heating and / or cooling element.
  • Document US-A-3,737,624 describes a complex heating element comprising a flat heating element, a layer of asbestos, a layer of asbestos coated on both sides with an aluminum reflective sheet and two layers asbestos consisting of a sheet of asbestos arranged to create cells.
  • the arrangement described does not, however, provide a rigid assembly which is sufficiently resistant from a mechanical point of view. It allows a deformation of the heating element under the effect of heat, which leads to a modification of the heat transfer mode, in particular because of the lack of adhesion between layers.
  • the asbestos structure also constitutes a compressible layer. In addition, asbestos is not suitable in many applications, particularly in domestic appliances.
  • the present invention aims to provide an electric heating element intended to be placed in industrial, domestic or household heating appliances, which does not have the abovementioned drawbacks of the prior art. It aims in particular to provide an electric heating element in which the flat heating element is held against the surface to be heated or in the direction of the use of the heat emitted.
  • a heating element of the aforementioned type which comprises at least one flat heating element secured by lashing by studs, by belt or by gluing, to a support constituted by a honeycomb structure or grid. in a compound based on mica, in particular in impregnated mica paper.
  • the structured support allows compression of the flat heating element against the surface to be heated and guarantees a pressure distributed over the surface of said flat heating element.
  • the flat heating element consists of electrical conductors embedded in sheets of impregnated mica paper.
  • the thermal expansions of one or the other are equal and that the stability of the heating element of the invention is further improved.
  • the honeycomb support can be made integral with the flat heating element by lashing by studs or by belt. We can also provide a bonding, especially when the materials of the flat heating element and the support are compatible.
  • honeycomb structure or the like is covered, on the face opposite to the flat heating element, with a reflective plate.
  • This can be made of a material known per se which fulfills the function of reflection and which resists the thermal and / or mechanical stresses to which it is subjected.
  • This reflective plate can also fulfill other functions such as a stop for fixing by studs, base plate of the structure of the heating appliance equipped with the heating device according to the invention and closing of the hollows of the structure. honeycomb or the like for the purpose of confining air masses and limiting convection.
  • the heating element according to the present invention allows the fixing of a flat heating element against a heating surface of a heating device while ensuring adequate maintenance of the flat heating element. It also guarantees thermal insulation on the rear face of the assembly, an increase in performance in use, a high impact resistance as well as great electrical safety at the rear of the assembly. It is also easy to provide an outlet for electrical connections and, possibly, the installation of regulation means, such as a thermostat, or of current limitation for example.
  • the support structured as a honeycomb or the like can then be provided with notches, cutouts or the like.
  • a flat heating element made of mica known per se with a support structured in honeycomb in mica and cover the back of the support with a metallic sheet in aluminum, stainless steel or made of aluminum foil glued to a stainless steel sheet or still from a mica-based sheet.
  • the heating element according to the present invention is particularly suitable for an application against surfaces to be heated in cast iron, in vitro-ceramic, in aluminum, in stainless steel or in sandwich steel or other suitable organic materials.
  • the heating element according to the invention without a surface to be heated, that is to say for example in toasters.
  • the structured honeycomb support can for example be produced using tongues based on impregnated mica paper, provided with slits and fitted into each other. It is obvious that the thickness of these can vary with the pressure to be applied as well as with the height and spacing thereof. In general, the thickness is between 0.1 and 1.0 mm and the height is between 3 and 10 mm, the spacing of the tabs can vary from 1 to 25 mm.
  • Temperature ranges of up to 750 ° C have been obtained at the surface of the flat heating element.
  • a surface to be heated 1 such as for example the bottom of a fryer tank or a vitro-ceramic plate.
  • a heating element 3 according to the invention is secured to the underside of the surface to be heated 1 by means known per se (not shown).
  • the heating element consists of a flat heating element 5 associated with a support structured as a honeycomb or the like 7, for example a cross structure, in particular a grid based on impregnated mica paper, and a plate reflector 9 fixed against the structured support, on the face opposite to the flat heating element.
  • Example 1 Application to an electric fryer.
  • a heating element according to the invention is placed against the underside of the bottom of a fryer bowl.
  • the structured support of the heating element of the invention consists of a cross made from impregnated mica paper having a thickness of 0.4 mm.
  • the support has a cross height of 10 mm and a cross pitch of 10 mm also.
  • the heating element is circular in shape and has a diameter of 150 mm.
  • the reflecting plate which may have a larger dimension, consists of a stainless steel of the stainless steel type 304 and is screwed or welded or else brazed to the bottom of the bowl which has a dimension of the order of 250 mm.
  • the heating element according to the invention has a power of 1500 W.
  • the fryer bowl is made of aluminum and has a thickness of the order of 2 mm.
  • a heating element according to the invention with a diameter of 180 mm and a power of 2000 W was placed under a vitro-ceramic hob of an electric stove.
  • the vitro-ceramic plate has a thickness of 4 mm and a dimension of 250 x 250 mm.
  • the heating element has dimensions close to those of the ceramic hob and consists of a flat heating element and a cross made from impregnated mica paper with a thickness of 0.4 mm, d 'a height of 10 mm spider, the pitch of the spider also being 10 mm.
  • the heating element is proclaimed using a metal sheet screwed or welded or brazed to the stove frame.
  • the arrangement of the device according to the invention is significantly less fragile during transport, assembly and operation than the conventional system, in particular as regards resistance to shock and vibration.

Landscapes

  • Resistance Heating (AREA)
  • Surface Heating Bodies (AREA)
EP89870217A 1989-01-04 1989-12-27 Heizelement Withdrawn EP0377425A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE8900011A BE1002726A3 (fr) 1989-01-04 1989-01-04 Element de chauffage.
BE8900011 1989-01-04

Publications (1)

Publication Number Publication Date
EP0377425A1 true EP0377425A1 (de) 1990-07-11

Family

ID=3883940

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89870217A Withdrawn EP0377425A1 (de) 1989-01-04 1989-12-27 Heizelement

Country Status (2)

Country Link
EP (1) EP0377425A1 (de)
BE (1) BE1002726A3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2697717A1 (fr) * 1992-10-29 1994-05-06 Thomson Csf Dispositif de réchauffage de cartes électroniques.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1340968A (fr) * 1962-09-14 1963-10-25 Aluminium Francais Procédé de chauffage par rayonnement infra-rouge et panneaux chauffants mettant en oeuvre ce procédé
US3737624A (en) * 1970-09-16 1973-06-05 Progressive Products Co Electric grill with a thin-film heating element
CH607528A5 (en) * 1976-04-09 1978-12-29 Husqvarna Ab Electric cooking pot with temp. regulation
US4173823A (en) * 1977-07-18 1979-11-13 American Can Company Resistance heater for a pizza carton
EP0154970A2 (de) * 1984-03-16 1985-09-18 DATACARD-MIDS GmbH Kaschiervorrichtung zur Herstellung von Identifikationskarten
WO1988004874A1 (fr) * 1986-12-19 1988-06-30 Compagnie Royale Asturienne Des Mines, Societe Ano Elements plats de chauffage electrique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1340968A (fr) * 1962-09-14 1963-10-25 Aluminium Francais Procédé de chauffage par rayonnement infra-rouge et panneaux chauffants mettant en oeuvre ce procédé
US3737624A (en) * 1970-09-16 1973-06-05 Progressive Products Co Electric grill with a thin-film heating element
CH607528A5 (en) * 1976-04-09 1978-12-29 Husqvarna Ab Electric cooking pot with temp. regulation
US4173823A (en) * 1977-07-18 1979-11-13 American Can Company Resistance heater for a pizza carton
EP0154970A2 (de) * 1984-03-16 1985-09-18 DATACARD-MIDS GmbH Kaschiervorrichtung zur Herstellung von Identifikationskarten
WO1988004874A1 (fr) * 1986-12-19 1988-06-30 Compagnie Royale Asturienne Des Mines, Societe Ano Elements plats de chauffage electrique

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2697717A1 (fr) * 1992-10-29 1994-05-06 Thomson Csf Dispositif de réchauffage de cartes électroniques.
EP0599678A1 (de) * 1992-10-29 1994-06-01 Thomson-Csf Anordnung zur Erwärmung von elektronischen Platten
US5486681A (en) * 1992-10-29 1996-01-23 Thomson-Csf Device for heating up electronic boards
WO2004075614A1 (fr) * 1992-10-29 2004-09-02 Pierre Dagnac Dispositif de rechauffage de cartes electroniques

Also Published As

Publication number Publication date
BE1002726A3 (fr) 1991-05-21

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