EP1067822B1 - 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
EP1067822B1
EP1067822B1 EP00450011A EP00450011A EP1067822B1 EP 1067822 B1 EP1067822 B1 EP 1067822B1 EP 00450011 A EP00450011 A EP 00450011A EP 00450011 A EP00450011 A EP 00450011A EP 1067822 B1 EP1067822 B1 EP 1067822B1
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EP
European Patent Office
Prior art keywords
heating element
envelope
element according
heating
calorific
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 - Lifetime
Application number
EP00450011A
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English (en)
French (fr)
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EP1067822A1 (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
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.)
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Publication date
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    • 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 to cooking appliances such as for example grills.
  • EP0456173 discloses a method of manufacturing a heating element for heating apparatus, of the type comprising a heating means associated with a heat sink, in which a heating means is placed in a mold consistent with the shapes and dimensions of the heating element, and the molten aluminum is cast in said mold.
  • 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 metallic sheath or other suitable material or fluid coolant circulating in a suitable sheath and, secondly, a dissipator associated closely with said heating means and more precisely with propose a technique of manufacturing such elements making more effective thermal transfers between heat source and dissipator.
  • a means generating heat such as an electrical resistance enclosed in a metallic sheath or other suitable material or fluid coolant circulating in a suitable sheath
  • a dissipator associated closely with said heating means and more precisely with propose a technique of manufacturing such elements making more effective thermal transfers between heat source and dissipator.
  • the subject of the invention is a method of manufacturing a heating element for heating or cooking appliance, of the type comprising a heating means associated with a heat sink, characterized in that it consists in placing in a mold a heating means acting as a core, said means and the inner wall of the mold being in accordance with shapes and dimensions of the heating element to be produced, said heating means having at least one envelope of fusible material and to flow into the mold a molten material consisting of a particular ferrous alloy to melting temperature substantially equivalent to that of said envelope of calorific means, this envelope having a thickness and an inertia sufficient to allow a superficial melting of the envelope without damaging it.
  • a heating element formed of a heating means such that for example an electrical resistance enclosed in an envelope metal or a tube of glass product under halogen, embedded in the mass of a ferrous alloy material such as gray cast iron for example, the fusion 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 transfer.
  • the calorific means can be constituted, in addition to the armored resistances or glass-product envelope, by a coolant flowing in a envelope of suitable material, or by the combination in the same heating element from two different sources, for example a resistor shielded electric and heat transfer fluid such as water.
  • This element consists of a shielded electrical resistance 1 embedded in a plate 2 of ferrous alloy, provided with grooves 3 on both faces.
  • the plate 2 has a generally rectangular shape, is provided on one side, in its four corners, studs 4 for fixing the heating element on the frame of the receiver.
  • the electrical resistance 1 which is for example an armored resistance conventional circuit comprising an electrical conductor embedded in the compressed magnesia enclosed in a sheath or metal shell, is arranged in a sinuous path in the thickness of the plate 2.
  • Resistor 1 is shown alone and in solid lines in FIG. in dashed, embedded in the plate 2 in Figure 1, the only ends 1a, 1b emerging from the plate in a wide 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 power supply circuit of the device.
  • Resistor 1 is bent and extends in a plane that coincides (Figure 2) with the plane of symmetry of the plate 2.
  • the plate 2 At the level of the resistance 1, the plate 2 has a tubular bulge 7 corresponding to the pattern of the resistance.
  • 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 to delimit the notch 5 of the plate 2.
  • the assembly 1.8 is then put in place in a two-part mold M1, M2 ( Figure 2) whose inner wall is shaped according to the shape and dimensions of the plate 2.
  • Said assembly 1.8 can be fixed in position correct by any appropriate means, such as gluing for example.
  • All 1.8 thus forms a core inside the mold M1, M2, which is going to be completely embedded in a particular ferrous liquid alloy conveyed from preferably at the bottom of the mold by a conduit 9 (source casting), the liquid gradually filling the entire mold rising inside this Last, vents are of course provided in appropriate places.
  • the ferrous alloy used for example a gray cast iron, is chosen or determined so as to have a melting point close to that of the sheath or shell of the resistor 1.
  • the latter also presents minimum thickness and thermal inertia, so that the contact between the pouring liquid and said sheath or envelope results in only one melting surface of the "skin" of the sheath, without causing deterioration of this last.
  • the conduct of the casting must be conducted in such a way as not to create overheating areas of the sheath of the resistor 1 inside the mold.
  • the heating element (1, 2) of Figure 1 can equip various types of electric heating appliances.
  • 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 convector comprising three heating elements according to the invention, 10, 11 and 12 respectively, formed of a plate disposed on the slice and each wrapping an armored electrical resistor 1.
  • the three plates 10, 11, 12 are placed in a baffle to constrain the flow of air to lick the maximum surface of the plates which, moreover, present, on their facing faces, vertical ribs 13 of channeling the air.
  • Fig. 7 shows a convective heater having a cylindrical heating element consisting of an electrical resistance 1 helix embedded in a tubular dissipator 14 provided internally with vertical splines 14 and externally covered with an insulating sleeve 16. The whole forms a natural convection heating chimney (or forced).
  • FIG. 8 represents a grill plate consisting of an element heating element comprising a shielded electrical resistance 1 embedded in a plate 17, for example cast iron, provided with grooves 18 on its face higher.
  • the heating elements (10, 11, 12, 1.14, 1.17) of FIGS. performed according to the method of the invention.
  • the shapes and dimensions of the resistor 1 and the plate or the like (2, 10 to 12, 14, 17) forming heatsink are variable depending on the type of equipment to equip.
  • the emitting surface of the dissipator (fluted surface or ribbed) can undergo treatment to confer properties improved or particular thermal.
  • this surface can be treated mechanically or chemically or coated with a black, matte or reflective paint for him to confer a state improving thermal exchanges by radiation or convection or favoring one mode of exchange over the other.
  • this adaptation or adequacy of melting temperatures of the two materials in the presence can also be affected by any technique, such as poteyage among others.
  • Resistor 1 may be of a type other than armored resistors 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 that is being considered for use.
  • the metallic sheath of the resistor 1 may comprise possibly diffusing fins.
  • a same plate or the like (2, 10 to 12, 14, 16) may include several resistors 1 in parallel.
  • a coolant such as water or other fluid circulating in a metal casing embedded in a particularly ferrous alloy material according to the present invention.
  • a heating element according to the invention may also consist of two different heat sources and of a different nature, for example a combination of an armored electrical resistance and a coolant, the envelopes of 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 and 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 as regards the shapes and dimensions of the calorific means, the dissipator constituted by the material poured around said heating means.
  • the surface of the dissipator can be coated with any material (enamel, teflon, paint) specific to the intended application, and / or have forms that promote heat exchange, such as pimples, fins, etc.

Landscapes

  • Resistance Heating (AREA)
  • General Preparation And Processing Of Foods (AREA)
  • Vending Machines For Individual Products (AREA)

Claims (12)

  1. Verfahren zum Herstellen eines Heizelements für ein Heiz- oder Kochgerät, des Typs, der ein Wärmeerzeugungsmittel, das einem Wärmeverbraucher zugeordnet ist, umfasst, dadurch gekennzeichnet, dass es darin besteht, ein als Gießkern dienendes Wärmeerzeugungsmittel (1) in einer Gießform (M1, M2) anzuordnen, wobei das Mittel sowie die Innenwand der Gießform mit den Formen und Abmessungen des zu verwirklichenden Heizelements übereinstimmen und das Wärmeerzeugungsmittel (1) wenigstens eine Hülle aus einem schmelzbaren Werkstoff umfasst, und in die Gießform ein geschmolzenes Material zu gießen, das aus einer insbesondere eisenhaltigen Legierung mit einer Schmelztemperatur, die zu jener der Hülle des Wärmeerzeugungsmittels im Wesentlichen äquivalent ist, gebildet ist, wobei diese Hülle eine Dicke und eine Wärmeträgheit aufweist, die ausreichen, damit ein oberflächliches Schmelzen der Hülle möglich ist, ohne sie zu verschlechtem.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Hülle des Wärmeerzeugungsmittels vor dem Gießen einem Schlichten unterworfen wird.
  3. Heizelement, das gemäß dem Verfahren nach Anspruch 1 oder 2 erhalten wird, dadurch gekennzeichnet, dass es aus einem Wärmeerzeugungsmittel (1) gebildet ist, das in eine Masse aus einer insbesondere eisenhaltigen Legierung getaucht ist, wobei das Wärmeerzeugungsmittel (1) wenigstens eine Hülle aufweist, deren Außenhaut mit dem umgebenden Material verschmolzen ist, wobei die Masse einen Wärmeverbraucher (2) bildet.
  4. Heizelement nach Anspruch 3, dadurch gekennzeichnet, dass das Wärmeerzeugungsmittel (1) aus der Gruppe gewählt ist, die abgeschirmte elektrische Widerstände, Halogenwiderstände in einem Glasrohr und Wärmetransportfluide, die in den schmelzbaren Hüllen wenigstens oberflächlich zirkulieren, umfasst.
  5. Heizelement nach Anspruch 4, dadurch gekennzeichnet, dass das Wärmeerzeugungsmittel (1) mehrere Widerstände umfasst, die nebeneinander liegen oder in einer gemeinsamen Hülle untergebracht sind.
  6. Heizelement nach Anspruch 4, dadurch gekennzeichnet, dass das Wärmeerzeugungsmittel (1) einen elektrischen Widerstand und ein Wärmetransportfluid umfasst, die nebeneinander liegen oder in einer gemeinsamen Hülle untergebracht sind.
  7. Heizelement nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, dass das Wärmeerzeugungsmittel (1) in einen Grauguss eingetaucht ist.
  8. Heizelement nach einem der Ansprüche 3 bis 7, dadurch gekennzeichnet, dass der Wärmeverbraucher eine ebene oder nicht ebene Platte (2) bildet.
  9. Heizelement nach Anspruch 8, dadurch gekennzeichnet, dass die Platte (2, 10 bis 12, 17) auf wenigstens einer Fläche Rillen, Rippen oder dergleichen (3, 12, 15, 18) aufweist.
  10. Heizelement nach Anspruch 8 oder 9, dadurch gekennzeichnet, dass der Wärmeverbraucher eine zylindrische Form (14) aufweist und innen gerillt ist.
  11. Heizelement nach einem der Ansprüche 3 bis 10, dadurch gekennzeichnet, dass die Oberfläche des Wärmeverbrauchers mechanisch oder chemisch bearbeitet ist oder mit einem Material überzogen ist, um den Wärmeaustausch zu verbessern oder um ihm bestimmte Wärmeaustauscheigenschaften zu verleihen.
  12. Heiz- oder Kochgerät, das wenigstens ein Heizelement nach einem der Ansprüche 3 bis 11 umfasst.
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 EP1067822A1 (de) 2001-01-10
EP1067822B1 true 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)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2855359B1 (fr) 2003-05-19 2005-07-01 Seb Sa Dispositif de chauffage d'un liquide pour appareil electromenager, appareil electromenager equipe d'un tel dispositif.
FR2942419B1 (fr) * 2009-02-23 2016-07-15 Soc Muller & Cie Procede de fabrication d'un element de chauffage d'un appareil de chauffage et moule pour l'obtention d'un tel element chauffant.
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
FR2991845B1 (fr) * 2012-06-12 2014-08-08 Muller & Cie Soc Appareil de chauffage par convection
FR3066010B1 (fr) * 2017-05-05 2019-11-08 Texas De France (Sas) Module chauffant pour appareil de chauffage electrique
US12117183B2 (en) * 2021-01-29 2024-10-15 B/E Aerospace, Inc. Vehicle oven having an improved heating element

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1239248B (it) * 1990-05-11 1993-09-28 I R C A Ind Resistenze Corazza Elemento scaldante d'aria in convezione forzata particolarmente per asciugabiancheria
FR2764162B1 (fr) * 1997-05-27 2004-09-03 Muller Et Cie Procede de realisation de resistances electriques blindees a dissipateurs multiples et resistances electriques ainsi obtenues

Also Published As

Publication number Publication date
ES2253196T3 (es) 2006-06-01
FR2796199B1 (fr) 2001-10-12
CY1105681T1 (el) 2010-12-22
ATE310370T1 (de) 2005-12-15
DE60023995T2 (de) 2006-08-10
EP1067822A1 (de) 2001-01-10
DK1067822T3 (da) 2006-03-27
FR2796199A1 (fr) 2001-01-12
DE60023995D1 (de) 2005-12-22

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