EP1067822A1 - Herstellungsverfahren eines Heizelements für Heizungs- oder Kochvorrichtung,solches Heizelement so hergestellt und so ausgerüstete Einrichtung - Google Patents

Herstellungsverfahren eines Heizelements für Heizungs- oder Kochvorrichtung,solches Heizelement so hergestellt und so ausgerüstete Einrichtung Download PDF

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Publication number
EP1067822A1
EP1067822A1 EP00450011A EP00450011A EP1067822A1 EP 1067822 A1 EP1067822 A1 EP 1067822A1 EP 00450011 A EP00450011 A EP 00450011A EP 00450011 A EP00450011 A EP 00450011A EP 1067822 A1 EP1067822 A1 EP 1067822A1
Authority
EP
European Patent Office
Prior art keywords
heating element
envelope
heating
element according
heat
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
EP00450011A
Other languages
English (en)
French (fr)
Other versions
EP1067822B1 (de
Inventor
Cecilio Arribas
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.)
Muller et Cie SA
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Muller et Cie SA
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Filing date
Publication date
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Application filed by Muller et Cie SA filed Critical Muller et Cie SA
Publication of EP1067822A1 publication Critical patent/EP1067822A1/de
Application granted granted Critical
Publication of EP1067822B1 publication Critical patent/EP1067822B1/de
Anticipated expiration legal-status Critical
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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
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
    • H05B3/50—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material heating conductor arranged in metal tubes, the radiating surface having heat-conducting fins

Definitions

  • the present invention relates to the manufacture of heating elements intended for radiant, convection or accumulation as well as cooking appliances such as for example grills.
  • the object of the invention is to produce elements of the type comprising, on the one hand, a means generating heat, such as an electrical resistance enclosed in a metal sheath or other suitable material or a fluid coolant circulating in a suitable sheath and, on the other hand, a dissipator thermal closely associated with said heating means and more precisely propose a technique for manufacturing such elements making them more efficient heat transfers between heat source and dissipator.
  • a means generating heat such as an electrical resistance enclosed in a metal sheath or other suitable material or a fluid coolant circulating in a suitable sheath
  • a dissipator thermal closely associated with said heating means and more precisely propose a technique for manufacturing such elements making them more efficient heat transfers between heat source and dissipator.
  • the invention relates to a method of manufacturing a heating element for heating or cooking appliance, of the type comprising a heat means associated with a heat sink, characterized in that it consists in placing in a mold a calorific means acting as core, said means as well as the internal wall of the mold being conformed to shapes and dimensions of the heating element to be produced, said heating means comprising at least one envelope of fusible material and to be poured into the molds a molten material made of a particularly ferrous alloy with melting temperature substantially equivalent to that of said envelope of the calorific means, this envelope having a thickness and an inertia sufficient thermal to allow surface fusion of the shell without damaging it.
  • a heating element formed of a calorific means such that for example an electrical resistance enclosed in an envelope metallic or a tube of glass product under halogen, embedded in the mass of a ferrous alloy material such as gray cast iron, for example, melting surface of the envelope of the resistance to contact of said alloy during the molding, ensuring an intimate connection between the materials providing a optimal efficiency of heat transfers.
  • a ferrous alloy material such as gray cast iron
  • the calorific means can be constituted, in addition to the armored resistances or with a glass product envelope, by a heat transfer fluid circulating in a envelope in suitable material, or by combining in the same heating element from two different sources, for example a resistor shielded electrical system and a heat transfer fluid such as water.
  • This element consists of a submerged shielded electrical resistance 1 in a plate 2 of ferrous alloy, provided with grooves 3 on its two faces.
  • the plate 2 has a generally rectangular shape, has one side, in its four angles, studs 4 intended for fixing the heating element on the frame of the receiving device.
  • the electrical resistance 1 which is for example a shielded resistance conventional comprising an electrical conductor embedded in compressed magnesia enclosed in a metal sheath or envelope, is arranged along a winding path in the thickness of the plate 2.
  • Resistor 1 is shown alone and in solid lines in FIG. dashed, embedded in the plate 2 in Figure 1, the only ends 1a, 1b emerging from the plate in a large notch 5 formed in one of the longitudinal edges of said plate 2.
  • Said ends 1a, 1b are opposite and reveal the stripped ends of the electrical resistance 6 for their connection to the the appliance's power supply circuit.
  • Resistor 1 is curved and extends in a coincident plane (Figure 2) with the plane of symmetry of the plate 2.
  • the plate 2 In line with the resistor 1, the plate 2 has a tubular bulge 7 corresponding to the resistance plot.
  • the method of manufacturing the heating element 1-2 of FIG. 1, consists, in accordance with the invention, in conforming the resistance 1 as illustrated by Figure 1a and to provide the area of the ends 1a, 1b, with a core protector 8 covering said ends.
  • This core 8 is for example made of sand, ceramic, polystyrene or any other suitable material. It is intended to protect ends 1a, 1b and delimit the notch 5 of the plate 2.
  • the set 1.8 is then placed in a two-part mold M1, M2 ( Figure 2) whose internal wall is shaped according to the shape and dimensions of plate 2.
  • Said set 1.8 can be fixed in position correct by all appropriate means, such as bonding for example.
  • All 1,8 thus forms a core inside the mold M1, M2, which will be completely embedded in a liquid ferrous alloy in particular transported from preferably at the bottom of the mold by a conduit 9 (source pouring), the liquid gradually filling the entire mold by rising inside this last, vents being of course provided in the appropriate places.
  • the ferrous alloy used for example gray cast iron, is chosen or determined so as to have a melting temperature close to that of the sheath or envelope of the resistance 1.
  • the latter also has a minimum thickness and thermal inertia, so that the contact between the pouring liquid and said sheath or envelope only causes a fusion superficial of the "skin" of the sheath, without causing deterioration of this last.
  • Said intimate connection between materials provides optimal efficiency to heat transfers between resistance 1 and plate 2 serving as heat sink or diffuser. This results in an increase longevity of the heating element, as well as the elimination of expansions differentials, noise sources and stresses, between resistance 1 and heatsink 2.
  • the casting procedure must be carried out so as not to create resistance 1 sheath overheating zones inside the mold.
  • the heating element (1, 2) of Figure 1 can equip various types electric heaters.
  • Figures 4 and 5 illustrate an apparatus for radiant heating and a convective heater respectively, each incorporating a heating element (1, 2).
  • Figure 6 schematically shows a heater convective type of accumulation, comprising three heating elements according to the invention, respectively 10, 11 and 12, formed of a plate arranged on the section and each wrapping an armored electrical resistance 1.
  • the three plates 10, 11, 12 are placed in a baffle to constrain the air flow to lick the maximum surface of the plates which, moreover, present, on their opposite faces, vertical ribs 13 for air channeling.
  • FIG. 7 represents a convective heating device comprising a cylindrical heating element consisting of an electrical resistance 1 in a helix embedded in a tubular dissipator 14 internally provided with vertical grooves 14 and externally covered with an insulating sleeve 16. The whole forms a heating chimney with natural (or forced) convection.
  • Figure 8 shows a grill plate made up of an element heater comprising a shielded electrical resistance 1 embedded in a plate 17, for example of gray cast iron, provided with grooves 18 on its face superior.
  • the heating elements (10,11,12; 1,14; 1,17) of figures 6 to 8 are produced in accordance with the method of the invention.
  • the shapes and dimensions of resistance 1 and plate or the like (2, 10 to 12, 14, 17) forming heatsink are variable depending on the type of devices to be fitted.
  • the emitting surface of the dissipator (grooved surface or ribbed) can undergo treatment to give it properties improved or specific thermal.
  • this surface can be treated mechanically or chemically or coated with black, mat or reflective paint for him confer a state improving the heat exchanges by radiation or convection or favoring one mode of exchange over the other.
  • the sheath coating material or envelope of resistance 1 Before casting the sheath coating material or envelope of resistance 1, it is possible to use a coating of said sheath or envelope, using a liquid or powder containing refractory or insulating products, in order to avoid attack by the alloy cast, reduce thermal shock to the resistance, adjust the melting temperature or change the thermal properties of the heat sink.
  • Resistor 1 can be of another type than armored resistors traditional and for example be constituted by a filament under halogen enclosed in a glass, quartz or similar tube, the temperature of which fusion is close to that of the alloy which we plan to use.
  • the metallic sheath of resistance 1 may optionally include diffusing fins.
  • a heat transfer fluid such as water or another fluid, circulating in a metallic envelope embedded in a particularly ferrous alloy material in accordance with this invention.
  • a heating element according to the invention can also consist of two separate heat sources of a different nature, for example a combination of an armored electrical resistance and a heat transfer fluid, envelopes from the two sources being either juxtaposed or integral with one of the other, the two envelopes possibly being part of the same monobloc assembly. These two envelopes are of course treated as a single envelope embedded in a cast material.
  • the invention is obviously not limited to the embodiments represented and described above, but on the contrary covers all variants in particular with regard to the shapes and dimensions of the calorific means, of the dissipator constituted by the material poured around said calorific means.
  • the heatsink surface can be coated with any material (enamel, teflon, paint) specific to the intended application, and / or present forms favoring heat exchange, such as spikes, fins, etc.

Landscapes

  • Resistance Heating (AREA)
  • General Preparation And Processing Of Foods (AREA)
  • Vending Machines For Individual Products (AREA)
EP00450011A 1999-07-09 2000-07-07 Herstellungsverfahren eines Heizelements für Heizungs- oder Kochvorrichtung,solches Heizelement so hergestellt und so ausgerüstete Einrichtung Expired - Lifetime EP1067822B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9909195A FR2796199B1 (fr) 1999-07-09 1999-07-09 Procede de fabrication d'element chauffant pour appareil de chauffage ou cuisson, element chauffant ainsi obtenu et appareils ainsi equipes
FR9909195 1999-07-09

Publications (2)

Publication Number Publication Date
EP1067822A1 true EP1067822A1 (de) 2001-01-10
EP1067822B1 EP1067822B1 (de) 2005-11-16

Family

ID=9548143

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00450011A Expired - Lifetime EP1067822B1 (de) 1999-07-09 2000-07-07 Herstellungsverfahren eines Heizelements für Heizungs- oder Kochvorrichtung,solches Heizelement so hergestellt und so ausgerüstete Einrichtung

Country Status (7)

Country Link
EP (1) EP1067822B1 (de)
AT (1) ATE310370T1 (de)
CY (1) CY1105681T1 (de)
DE (1) DE60023995T2 (de)
DK (1) DK1067822T3 (de)
ES (1) ES2253196T3 (de)
FR (1) FR2796199B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2855359A1 (fr) * 2003-05-19 2004-11-26 Seb Sa Dispositif de chauffage d'un liquide pour appareil electromenager, appareil electromenager equipe d'un tel dispositif.
FR2942419A1 (fr) * 2009-02-23 2010-08-27 Muller & Cie Soc Procede de fabrication d'un element de chauffage d'u appareil de chauffage et moule pour l'obtention d'un tel element chauffant.
FR2991845A1 (fr) * 2012-06-12 2013-12-13 Muller & Cie Soc Appareil de chauffage par convection
WO2018202961A1 (fr) 2017-05-05 2018-11-08 Texas De France (Cas) Module chauffant pour appareil de chauffage électrique

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2968225B1 (fr) * 2010-12-03 2012-12-28 Thermor Pacific Procede de surmoulage et procede de fabrication d'un corps de chauffe mettant en oeuvre ce procede de surmoulage
US20220243921A1 (en) * 2021-01-29 2022-08-04 Koninklijke Fabriek Inventum B.V. Vehicle oven having an improved heating element

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0456173A1 (de) * 1990-05-11 1991-11-13 I.R.C.A. S.P.A. Industria Resistenze Corazzate Ed Affini Heizelement mit gezwungener Luftströmung für Wäschetrockner
FR2764162A1 (fr) * 1997-05-27 1998-12-04 Muller Et Cie Procede de realisation de resistances electriques blindees a dissipateurs multiples et resistances electriques ainsi obtenues

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0456173A1 (de) * 1990-05-11 1991-11-13 I.R.C.A. S.P.A. Industria Resistenze Corazzate Ed Affini Heizelement mit gezwungener Luftströmung für Wäschetrockner
FR2764162A1 (fr) * 1997-05-27 1998-12-04 Muller Et Cie Procede de realisation de resistances electriques blindees a dissipateurs multiples et resistances electriques ainsi obtenues

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2855359A1 (fr) * 2003-05-19 2004-11-26 Seb Sa Dispositif de chauffage d'un liquide pour appareil electromenager, appareil electromenager equipe d'un tel dispositif.
WO2004105438A1 (fr) * 2003-05-19 2004-12-02 Seb S.A. Dispositif de chauffage d'un liquide pour appareil electromenager, appareil electromenager equipe d'un tel dispositif
US7286752B2 (en) 2003-05-19 2007-10-23 Seb S.A. Device for heating a liquid for domestic appliance, domestic appliance fitted with said device
CN100455145C (zh) * 2003-05-19 2009-01-21 Seb股份有限公司 用于家用电器的加热液体的装置及装有这种加热装置的家用电器
FR2942419A1 (fr) * 2009-02-23 2010-08-27 Muller & Cie Soc Procede de fabrication d'un element de chauffage d'u appareil de chauffage et moule pour l'obtention d'un tel element chauffant.
WO2010094903A3 (fr) * 2009-02-23 2011-02-03 Société Muller & Cie Procédé de fabrication d'un élément de chauffage d'un appareil de chauffage et moule pour l'obtention d'un tel élément chauffant
FR2991845A1 (fr) * 2012-06-12 2013-12-13 Muller & Cie Soc Appareil de chauffage par convection
WO2018202961A1 (fr) 2017-05-05 2018-11-08 Texas De France (Cas) Module chauffant pour appareil de chauffage électrique
FR3066010A1 (fr) * 2017-05-05 2018-11-09 Texas De France (Sas) Module chauffant pour appareil de chauffage electrique

Also Published As

Publication number Publication date
FR2796199A1 (fr) 2001-01-12
EP1067822B1 (de) 2005-11-16
CY1105681T1 (el) 2010-12-22
ATE310370T1 (de) 2005-12-15
DE60023995T2 (de) 2006-08-10
ES2253196T3 (es) 2006-06-01
FR2796199B1 (fr) 2001-10-12
DK1067822T3 (da) 2006-03-27
DE60023995D1 (de) 2005-12-22

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