EP0210575A1 - Corps de chauffe électrique à radiation pour réchauffer des plaques chauffantes ainsi que procédé et dispositif pour sa fabrication - Google Patents

Corps de chauffe électrique à radiation pour réchauffer des plaques chauffantes ainsi que procédé et dispositif pour sa fabrication Download PDF

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Publication number
EP0210575A1
EP0210575A1 EP86110033A EP86110033A EP0210575A1 EP 0210575 A1 EP0210575 A1 EP 0210575A1 EP 86110033 A EP86110033 A EP 86110033A EP 86110033 A EP86110033 A EP 86110033A EP 0210575 A1 EP0210575 A1 EP 0210575A1
Authority
EP
European Patent Office
Prior art keywords
insulating body
heating coil
coil
radiant heater
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.)
Granted
Application number
EP86110033A
Other languages
German (de)
English (en)
Other versions
EP0210575B1 (fr
Inventor
Bernhard Mikschl
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.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Gerate Blanc und Fischer GmbH
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 EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Priority to AT86110033T priority Critical patent/ATE72615T1/de
Publication of EP0210575A1 publication Critical patent/EP0210575A1/fr
Application granted granted Critical
Publication of EP0210575B1 publication Critical patent/EP0210575B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H05B3/688—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
    • H05B3/68—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

Definitions

  • the invention relates to an electric radiant heater for heating heating surfaces and a method and a device for its production.
  • a radiant heater has become known in which heating coils with a circular cross section are embedded in the surface of an insulating body which contains fibrous material by being pressed in and thereby fixed. It is also mentioned there that the heating coils can have an oval shape, namely lying flat, i.e. with its smallest extension, i.e. the small axis towards the heating plate. This serves to save overall height.
  • the embedding of an approximately oval wire helix on one of its narrow sides has several advantages: Given the width of the helix in the direction of the surface, that is, depending on the usable area unit, the oval shape of the wire length is somewhat longer than that of the circular helix and much larger than in the case of lying oval shape. Furthermore, the coil is fixed much better when embedding a certain fraction of its total wire length, because a much larger arc piece is held. For example, when embedding a 180 ° arch, this can only be a third or a quarter of the total Make the circumference of the turns so that there is sufficient radiation area.
  • the helix pitch ie the proportion of the gaps between the individual turns, can also be greater, so that penetration into the embedding material is promoted.
  • the penetration of the more curved side surface into the material is easier to make and when pressed in, even thin wires do not tend to deform or fall over in the longitudinal direction of the coil and lie flat.
  • This also contributes to the fact that the helix can be guided in a groove when inserting over two thirds or three quarters of its circumference and the pressure acting on the free apex presses the flatter sides of the oval against the groove walls and thereby stiffens the helix, which in the Transverse direction also has a large section modulus.
  • the radiant heater 11 shown in FIG. 1 is used to heat a glass ceramic heating surface 12 or other heating surfaces made of ceramic. Although it is preferably intended for heating one of several hotplates on a coherent cooking surface, it can also be used for single hotplates etc.
  • the radiant heater 11 contains a sheet metal carrier shell 13, in which a plate-like insulating body 14 with a round bottom 15 and a peripheral edge 16 is arranged like the carrier shell.
  • this mechanically quite firm and manageable insulating body 14 can be underlaid by an insulating layer 17, which is less mechanically strong but has excellent thermal insulation, for example made of pyrogenic silica.
  • the insulating body is pressed with the upper end face of the edge 16 onto the underside of the cooking surface 12 by spring elements, not shown. It preferably consists of a fibrous, high-temperature-resistant insulating material, for example an aluminum oxide fiber, which is commercially available under the name "Fiberfrax".
  • Heating coils 20 made of wire-shaped electrical resistance material 21 are partially pressed and fixed into the substantially flat surface 18 of the bottom 15 of the insulating body 14.
  • Each turn 60 of the heating coil 20 has an approximately oval shape, which can be seen in particular in FIG. 3, which consists of two approximately semicircular arches on the narrow sides of the oval and two connecting them, essentially rectilinear or slightly outward or inward (dash-dotted line in Fig. 3) there are curved sides 24, 25.
  • the more curved narrow sides 22, 23 can, in deviation from the semicircular shape, be slightly more curved in the area of their apex 26.
  • the insulating body 14 is produced according to the following method: From a slurry of the insulating fibers in water, to which inorganic or organic binders of the usual type are also added, the fibers are sucked in by a suction mold, which has a negative in the thickness of the insulating body, but with a free lower one Bottom 29 forms. A resulting thickening on the bottom 29 is cut off and, if necessary after a pre-pressing, the soft, moist insulating body 14 '(FIG. 5) is introduced into a mold 30.
  • the prepared oval heating coils are inserted over their entire length into grooves 33 in the area of non-distorted ends after welding of connecting pins 28, the shape of which corresponds to the oval shape of the heating coils 20, but has a smaller depth.
  • the oval heating coils are thus inserted into the grooves 33 with an upright cross section and project with about a third to a quarter of their larger cross sectional dimensions a (FIG. 3) over a pressing surface 34 of the punch 32 carrying the grooves.
  • the width of the grooves is such that the heating coils can be inserted well, but are guided as precisely as possible.
  • the grooves 33 run in the case of circular radiators mostly spirally, in single or multi-course spirals or a double spiral, which has a reversal point in the middle and can consist of one or more spiral sections, each of which is provided with electrical connection pins 28, which through the insulating body 14 lead wires 61 are welded.
  • the insert die 32 and the mold 30 are moved relatively towards each other in the direction of arrows 34 and 35 and the insertion stamp presses the still plastically deformable Isolierkorper-Vorfdrmling 14 'in its in FIG. 6 to ER- k ennende end shape 14.
  • the heating coils are 20 with their narrow sides 22 in the surface 18 and thus the material of the insulating body pressed or pressed and fixed.
  • the heating coils consist of very thin resistance material in the order of magnitude between 0.15 and 0.25 mm, this would hardly be possible with round coils. Due to the oval shape and the good guidance in the grooves 33, even greater compressions of the insulating body and thus a good fixing can be achieved. Due to the good guidance, the helixes do not tend to buckle laterally and cannot fall over in the longitudinal direction of the helix because the pressure on the curved section 22 of the helix spreads the sides 24 and 25 somewhat apart and clamps them on the groove inner wall (FIG. 6). A good definition also contributes to the fact that the helix pitch h (FIG.
  • the embedding can be more or less complete and deep and the depressions 43 can also be completely closed, in particular if a less elastic and fibrous material is used.
  • Fig. 3 it can be seen that the embedding of the coil on the outer edge of each turn is slightly higher than on the inner edge, so that a flat channel forms in the area of the heating coil, which favors the fixing. Above all, however, it can be seen that it is possible to keep most of the interior 45 of the insulation free of insulating material, so that no heat accumulation can form there, which could lead to premature mechanical and thermal wear of the heating coils.
  • the insertion die 32 and the mold 30 are removed from one another again, the heating coils remaining in the insulating body. They can be easily pulled out of the grooves 33 because they spring back a little when the punch is relieved and have play with the groove walls.
  • the now pressed, but still moist insulating body 14 is now brought into its relatively solid final state by drying or other hardening measures.
  • the invention makes it possible to accommodate large lengths of wire on a given unit area, so that even radiators in a multi-cycle circuit with small ones Partial services can be produced.
  • the relatively large ratio between the possible helix pitch h to the wire diameter d of the resistance material 21, preferably h / d 2 to 10, also contributes to the radiation and ventilation conditions being good. Since, in addition to the extension of the wire diameter for a given width, the oval shape also improves the fixability, it is possible to arrange the spirals in relatively closely spaced spiral paths, so that this also increases the wire length to be accommodated per unit area and enables very uniform heating.
  • the preferred uniform fixing of the heating coils over their entire length also avoids creeping movements of the coil and creates short-circuit protection even at a short distance.
  • a major axis of the oval W endelqueriteses to the transverse dimensions b in the direction of the small O valachse 5 1 has a value of more than 1.5, preferably ca. 2 proven.
  • the large axis 50 (FIG. 3) is approximately perpendicular to the surface of the insulating body 18.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • General Induction Heating (AREA)
EP86110033A 1985-07-31 1986-07-22 Corps de chauffe électrique à radiation pour réchauffer des plaques chauffantes ainsi que procédé et dispositif pour sa fabrication Expired - Lifetime EP0210575B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86110033T ATE72615T1 (de) 1985-07-31 1986-07-22 Elektrischer strahlheizkoerper zur beheizung von heizflaechen sowie verfahren und vorrichtung zu seiner herstellung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853527413 DE3527413A1 (de) 1985-07-31 1985-07-31 Elektrischer strahlheizkoerper zur beheizung von heizflaechen sowie verfahren und vorrichtung zu seiner herstellung
DE3527413 1985-07-31

Publications (2)

Publication Number Publication Date
EP0210575A1 true EP0210575A1 (fr) 1987-02-04
EP0210575B1 EP0210575B1 (fr) 1992-02-12

Family

ID=6277271

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86110033A Expired - Lifetime EP0210575B1 (fr) 1985-07-31 1986-07-22 Corps de chauffe électrique à radiation pour réchauffer des plaques chauffantes ainsi que procédé et dispositif pour sa fabrication

Country Status (9)

Country Link
US (1) US4789773A (fr)
EP (1) EP0210575B1 (fr)
JP (1) JPS6235487A (fr)
AT (1) ATE72615T1 (fr)
AU (1) AU600906B2 (fr)
DE (2) DE3527413A1 (fr)
ES (1) ES2000793A6 (fr)
YU (1) YU133986A (fr)
ZA (1) ZA865596B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0625865A2 (fr) * 1993-05-21 1994-11-23 Ceramaspeed Limited Méthode pour la fabrication de corps de chauffe rayonnants

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3828192A1 (de) * 1988-08-19 1990-02-22 Ego Elektro Blanc & Fischer Strahlheizkoerper sowie verfahren und vorrichtung zu seiner herstellung
DE4019898A1 (de) * 1990-06-22 1992-01-02 Ego Elektro Blanc & Fischer Verfahren und vorrichtung zum befestigen von heizwiderstaenden auf einem traeger
DE4229375C2 (de) * 1992-09-03 2000-05-04 Ego Elektro Blanc & Fischer Strahlungs-Heizkörper
US5796075A (en) * 1992-03-09 1998-08-18 E.G.O. Elektro-Gerate Blanc Und Fisher Gmbh & Co. Kg Heater, particularly for kitchen appliances
DE9214270U1 (de) * 1992-10-22 1994-04-07 Eichenauer Gmbh & Co Kg F Elektrischer Strahlungsheizeinsatz für Glaskeramik-Kochfeld
GB2275162B (en) * 1993-02-11 1996-04-10 Ceramaspeed Ltd Radiant electric heater method
GB2275160B (en) * 1993-02-11 1996-04-03 Ceramaspeed Ltd Method of manufacturing a radiant electric heater
GB2275161B (en) * 1993-02-11 1996-05-15 Ceramaspeed Ltd Method of manufacturing a radiant electric heater
DE4320214A1 (de) * 1993-06-18 1994-12-22 Belzig Elektrowaerme Gmbh Anordnungen elektrischer Verbindungen und Elemente hierfür
DE19522798A1 (de) * 1995-06-23 1997-01-02 Ego Elektro Blanc & Fischer Verfahren zur Herstellung eines Strahlungsheizkörpers und Strahlungsheizkörper
US6194689B1 (en) * 1998-05-11 2001-02-27 Emerson Electric Co. Radiant heater element for use in grill and the like
US6232630B1 (en) 1999-07-07 2001-05-15 Advanced Micro Devices, Inc. Light floating gate doping to improve tunnel oxide reliability
DE102006001151B3 (de) * 2006-01-06 2007-05-10 Von Ardenne Anlagentechnik Gmbh Heizerfeld eines Strahlungsheizers mit einer Heizspirale
GB0811980D0 (en) * 2008-07-07 2008-07-30 Ceramaspeed Ltd Radiant electric heater
US8611799B2 (en) * 2010-07-21 2013-12-17 Casio Electronics Manufacturing Co., Ltd. Achromatic apparatus for achromatizing achromatic toner image formed on recording medium
US9113501B2 (en) 2012-05-25 2015-08-18 Watlow Electric Manufacturing Company Variable pitch resistance coil heater
US20210041108A1 (en) * 2019-08-09 2021-02-11 Eidon, Llc Apparatuses for radiant heating

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE464026A (fr) *
US2235091A (en) * 1936-09-12 1941-03-18 Samuel S Vineberg Heating unit for electrical cooking devices
FR880865A (fr) * 1941-03-31 1943-04-07 Dispositif de chauffage
FR929589A (fr) * 1945-06-21 1947-12-31 élément chauffant à résistance électrique perfectionné
EP0031514A1 (fr) * 1979-12-14 1981-07-08 E.G.O. Elektro-Geräte Blanc u. Fischer Radiateur de chauffage électrique ainsi que procédé et dispositif pour sa fabrication
EP0071048A1 (fr) * 1981-07-24 1983-02-09 E.G.O. Elektro-Geräte Blanc u. Fischer Elément de chauffage électrique par radiation 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

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3047702A (en) * 1958-10-03 1962-07-31 Fredrick L Lefebvre Plate heater
US3991298A (en) * 1975-07-28 1976-11-09 Gould Inc. Heating unit for a ceramic top electric range
DE2551137C2 (de) * 1975-11-14 1986-04-24 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Elektrischer Strahlungsheizkörper für Glaskeramikkochplatten
ZA774922B (en) * 1977-03-09 1978-06-28 Emerson Electric Co Open coil heater
SE7806238L (sv) * 1977-07-02 1979-01-03 Fischer Karl Elektriskt stralningsvermeelement, serskilt for glaskeramikkokhell
DE2820138A1 (de) * 1978-05-09 1979-11-15 Karl Fischer Strahlungs-heizeinheit insbesondere fuer glaskeramik-elektrokochgeraete
DE2729929C3 (de) * 1977-07-02 1981-10-08 Karl 7519 Oberderdingen Fischer Strahlungs-Heizeinheit für Glaskeramik-Elektrokochgeräte
CA1115761A (fr) * 1977-12-21 1982-01-05 Ewald R. Werych Element chauffant a serpentin plat encastre
LU82075A1 (fr) * 1980-01-10 1980-04-23 Belge Isolants Element de chauffage electrique
NZ197851A (en) * 1980-08-13 1984-09-28 Micropore International Ltd Cooker element:temperature sensor receives heated air
DE3437940C2 (de) * 1984-10-17 1986-08-14 Roland Ing.(grad.) 5828 Ennepetal Abicht Haltevorrichtung für einen elektrischen Heizleiter in einem Formkörper aus Isolierstoff

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE464026A (fr) *
US2235091A (en) * 1936-09-12 1941-03-18 Samuel S Vineberg Heating unit for electrical cooking devices
FR880865A (fr) * 1941-03-31 1943-04-07 Dispositif de chauffage
FR929589A (fr) * 1945-06-21 1947-12-31 élément chauffant à résistance électrique perfectionné
EP0031514A1 (fr) * 1979-12-14 1981-07-08 E.G.O. Elektro-Geräte Blanc u. Fischer Radiateur de chauffage électrique ainsi que procédé et dispositif pour sa fabrication
EP0071048A1 (fr) * 1981-07-24 1983-02-09 E.G.O. Elektro-Geräte Blanc u. Fischer Elément de chauffage électrique par radiation 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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0625865A2 (fr) * 1993-05-21 1994-11-23 Ceramaspeed Limited Méthode pour la fabrication de corps de chauffe rayonnants
EP0625865A3 (fr) * 1993-05-21 1995-01-11 Ceramaspeed Ltd Méthode pour la fabrication de corps de chauffe rayonnants.
US5477605A (en) * 1993-05-21 1995-12-26 Ceramaspeed Limited Method of manufacturing a radiant electric heater

Also Published As

Publication number Publication date
ATE72615T1 (de) 1992-02-15
US4789773A (en) 1988-12-06
AU600906B2 (en) 1990-08-30
DE3527413A1 (de) 1987-02-12
YU133986A (en) 1988-04-30
ZA865596B (en) 1987-03-25
AU6009186A (en) 1987-02-05
ES2000793A6 (es) 1988-03-16
JPS6235487A (ja) 1987-02-16
DE3683881D1 (de) 1992-03-26
EP0210575B1 (fr) 1992-02-12

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