EP0383014A2 - Elément chauffant radiant électrique - Google Patents

Elément chauffant radiant électrique Download PDF

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Publication number
EP0383014A2
EP0383014A2 EP90100490A EP90100490A EP0383014A2 EP 0383014 A2 EP0383014 A2 EP 0383014A2 EP 90100490 A EP90100490 A EP 90100490A EP 90100490 A EP90100490 A EP 90100490A EP 0383014 A2 EP0383014 A2 EP 0383014A2
Authority
EP
European Patent Office
Prior art keywords
radiator
radiant heater
dark
heater according
insulating support
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Withdrawn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
EP90100490A
Other languages
German (de)
English (en)
Other versions
EP0383014A3 (fr
Inventor
Gerhard Goessler
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
Publication of EP0383014A2 publication Critical patent/EP0383014A2/fr
Publication of EP0383014A3 publication Critical patent/EP0383014A3/fr
Withdrawn legal-status Critical Current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
    • H05B3/68—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
    • H05B3/742—Plates having both lamps and resistive heating 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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/04—Heating plates with overheat protection means

Definitions

  • the invention relates to an electric radiant heater, in particular for heating glass-like plates such as glass ceramic plates.
  • an electric steel radiator has become known, the heating of which has a heating resistor operated at a very high annealing temperature, which is encapsulated in the manner of a halogen lamp in a quartz glass tube which is curved in the form of a circular arc.
  • This light source is used to heat a glass ceramic plate.
  • EP-A-176027 provides that circular light emitters always run around in the outer edge area, in order to also optically delimit the heating zone on the glass ceramic plate, since the glass ceramic plate is partially transparent, at least when the light emitter is strong.
  • the curved light emitters were specially developed to enable the entire light emitter output to be accommodated in a single revolution of the outer area of the radiant heater, leaving the central zone for the more flat-looking dark emitters.
  • the glow pattern and other performance properties and the manufacturability are not ideal.
  • the object of the invention is therefore to improve such a radiant heater with light and dark radiators so that it has a good glow pattern and improved properties with ease of manufacture.
  • the invention follows the path which at first sight seems contradictory, not to provide the approximately circular or polygonal curved light radiator in the edge area, but to let it surround a largely unheated central zone, while the dark radiator rotates in the outer area. This not only contradicts the trend of development, but also seems to cancel or question the advantage of the curved light source, namely optically delimiting the cooking area.
  • the dark radiators lying in the middle whose radiation starts later because of their greater thermal inertia and on the other hand are not so far in the visible range that they would weigh in comparison to the light radiator, are brightly illuminated by him, which has an optically unattractive effect. It is different with the proposed arrangement, where the light emitter is just so far from the edge that the viewer can still see the ring completely at an oblique angle, while the illuminated dark emitter lying in front of it is covered by the edge. In the rear area, on the other hand, the light emitter is arranged in front of the dark emitters and outshines them so that only the central zone, which is preferably free of all emitters, is visible and offers a pleasing sight.
  • the risk of glare is reduced by arranging the light source further inside.
  • the light emitter whose short-wave radiation penetrates the glass ceramic plate directly to a greater extent, so that contact between the cooking vessel and the heated plate is not so important at this point, in the area in which a is usually somewhat concave pot has a certain distance from the plate, while the dark emitters, the power of which is transmitted to a greater extent by contact from the heated plate, are in the area in which the pot stands up with its outer edge.
  • the radiation from the light emitter which is also at a certain distance from the plate, penetrates the plate in a relatively wide band, which on the one hand projects partly over the dark emitters and on the other hand also into the central zone. Eliminating self-heating of the central zone is also advantageous, since the radiation from the light radiator is concentrated at this point anyway.
  • the production has the advantage that no dark radiators need to be attached to the inside of the arc, ring or circular light radiator. These would have to have a feeder that would have to run under the light source and accordingly under the insulation.
  • the ring area in which the dark radiator is arranged is directly adjacent to the edge of the radiant heater, which projects up to the heated plate.
  • This area can therefore be formed in one piece with the edge as a ring and the dark radiators can be attached advantageously and securely to the preferably mechanically stronger insulating material from which the edge and also the dark radiator ring zone are made, for example by partial embedding.
  • Other fastening methods are also in this area and in particular on a mechanically stronger one, e.g. B. fibrous insulating material containing insulating body particularly well.
  • the entire inner area, in which the light emitter and the central zone are located, can lie inside this ring, so that an insulating layer below the edge component forms the insulating support surface. It can be recessed in a ring shape in the area of the light emitter, so that the light emitter, which normally has a larger diameter than the dark emitter, is in alignment with its upper edge in order to ensure an equal distance from the temperature sensor.
  • the main advantage of this is that an insulating material can be used in the central area, which has a very high thermal insulation ability and also high heat resistance, for example a pressed bulk material based on a pyrogenic silica airgel. However, this material does not have great mechanical strength and would hardly allow it to be fixed by embedding. In the light emitter and middle range, however, its surface is sufficiently firm and stable.
  • the drawing shows a radiant heater 11 which is arranged under a glass ceramic plate 12 and delimits a heating or cooking zone 13 thereon.
  • the radiant heater 11 is resiliently pressed with its edge 14 against the underside of the glass ceramic plate 12 by means not shown.
  • the radiant heater 11 is heated by a light radiator 18 and a dark radiator 20.
  • the light radiator contains in a quartz glass tube a high-temperature-resistant heating resistor 21, for example made of tungsten, which runs from one light radiator connection end 22 to the other and is supported in between by spacers 23.
  • the quartz glass tube 24, in the example shown, is polygonal for manufacturing reasons, for example in the manner of an octagon, into an almost complete circle, with its two connections 22 leading close together parallel through the edge 14 out of the radiant heater and there with Line connections are provided.
  • the intended annealing temperature is over 1500 K, preferably around 2300 K.
  • the glow temperature of the dark radiator 20 is substantially below this value and preferably below 1500 K. It is a conventional helically bent open wire made of resistance material which, because of its lower glow temperature, does not require a protective gas atmosphere like the light radiator.
  • the dark radiator is designed in the form of a double guided ring, the connections 25 of which extend on the same side of the double arc to the inner and outer turns, while on the other side the two turns are connected to one another by an arc 26.
  • a connector 38 for the dark emitter connections 25 is inserted into the edge of the carrier shell 15.
  • a rod-shaped temperature sensor 27 of a temperature switch 28 protrudes diametrically over the circular steel heating element and is guided in the edge 14 on both sides.
  • the switch head of the temperature switch 28 is outside the remaining steel radiator limit. It normally contains two temperature switches, one of which serves to limit the temperature and the other as a signal contact for reporting the hot state of the hotplate.
  • the temperature sensor 27, which may optionally have an insulating outer tube, projects through the bowl-shaped interior 29 of the radiant heater at a distance from the underside of the glass ceramic plate 12 and the radiators 18, 20.
  • Light and dark radiators are electrically connected in series with one another and with the temperature limiter contact of the temperature switch 28.
  • the dark radiator 20 is arranged in a ring region 30 on an inner flange-like section 31 which is directed inward from the edge 14 and which, together with the ring 14, thus forms an integral annular component 32 with an L-shaped cross section.
  • It is made of an insulating material with good mechanical strength, which contains a relatively high proportion of heat-resistant fibers, for example Al2O3, or consists of this. It can be made wet in a vacuum suction process. In the wet state, the heating coils of the dark radiator 20 are then partially pressed into the surface and, after drying or curing, are well defined therein, although their vast majority and, above all, almost the entire interior of the heating coil remains free and can therefore radiate well.
  • the outer turn of the dark radiator 20 can adjoin the inside of the edge 14 and the section 31 ends with a ring inner edge 33 with a not too great distance from the light radiator 18. This is arranged with its central axis somewhat lower than the dark radiators, so that it despite its larger diameter, its top is aligned with the top of the dark radiator.
  • an insulating layer 34 belonging to the insulating support 15, on which the component 32 rests in the edge region, is lowered in the region of the light emitter, so that it forms an annular, flat trough 35 which rises again towards the center.
  • the iso Liertik 34 consists of a fumed silica airgel, which has excellent thermal insulation properties and high temperature resistance and has a surface after a relatively loose compression, which, because it is not exposed to significant stresses, is sufficiently firm for use.
  • the insulating support is constructed in a manner which is advantageous in terms of manufacture and function, since the use of two insulating materials with different properties is in each case restricted to the areas in which their properties have an optimal effect.
  • the light radiator although it is arranged so deep that the temperature sensor can still run at a good distance from it and to the heated plate 12, can still be seen almost completely as a ring from a viewing angle of approximately 30 °, while the dark radiator then completely removed from consideration in the front area.
  • the dark radiator ring zone 30 has a diameter between 10 and 20, preferably 15% of the total diameter of the hotplate 13, while the diameter of the light radiator 18 is between 50 and 70% of the hotplate diameter, preferably 60%.
  • the light emitter 18 can rest on the insulating layer 34 in the region of the groove 35 and, on the other hand, is guided in the region in which it penetrates the edge 14 and corresponding openings in the carrier shell 16.
  • the arrangement with two connections 22 of the light radiator leading parallel and next to one another is preferred because it is one of the light radiators 18 largely enclosing dark radiator ring zone 30 enables.
  • the edge could also be made over a certain height from the insulating material of the insulating layer 34, which has better thermal insulating properties than the fibrous material of the edge.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Electric Stoves And Ranges (AREA)
EP19900100490 1989-02-11 1990-01-11 Elément chauffant radiant électrique Withdrawn EP0383014A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3904177 1989-02-11
DE3904177A DE3904177A1 (de) 1989-02-11 1989-02-11 Elektrischer strahlheizkoerper

Publications (2)

Publication Number Publication Date
EP0383014A2 true EP0383014A2 (fr) 1990-08-22
EP0383014A3 EP0383014A3 (fr) 1992-03-11

Family

ID=6373922

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900100490 Withdrawn EP0383014A3 (fr) 1989-02-11 1990-01-11 Elément chauffant radiant électrique

Country Status (3)

Country Link
US (1) US5032706A (fr)
EP (1) EP0383014A3 (fr)
DE (1) DE3904177A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2287388A (en) * 1994-03-09 1995-09-13 Ceramaspeed Ltd Glass ceramic top cooking appliance

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19540004A1 (de) * 1995-10-27 1997-04-30 Ego Elektro Blanc & Fischer Strahlungs-Heizer
US6668385B2 (en) * 2002-03-28 2003-12-30 Stephen A. Gathings, Jr. Adjustable insulation apparatus
CA2781341C (fr) * 2009-11-25 2015-05-12 Wlodzimierz Myslowski Procede de fabrication de liant granule polymere-asphalte et de beton au soufre avec la participation de polymere de soufre obtenu par une modification a base de solvant de soufre residuaire
US11098923B2 (en) * 2016-03-31 2021-08-24 Gd Midea Environment Appliances Mfg Co., Ltd. Electric radiator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3406604C1 (de) * 1984-02-23 1985-07-25 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Heizeinrichtung fuer Strahlungsheizstellen mit elektrischen Strahlungsheizelementen
EP0164900A1 (fr) * 1984-05-15 1985-12-18 Ge Lighting Limited Appareil de chauffage
EP0206597A1 (fr) * 1985-06-11 1986-12-30 Micropore International Limited Appareils de chauffage à infra-rouge
GB2186166A (en) * 1986-01-24 1987-08-05 Redring Electric Ltd Electric hobs and heating units therefor
EP0265635A1 (fr) * 1986-10-17 1988-05-04 E.G.O. Elektro-Geräte Blanc u. Fischer Elément chauffant à radiation

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1273023A (en) * 1969-02-18 1972-05-03 Electricity Council Improvements in or relating to electric cookers
US4700051A (en) * 1984-09-22 1987-10-13 E.G.O. Elektro-Gerate Blanc U. Fischer Radiant heater for cooking appliances
GB8602507D0 (en) * 1986-02-01 1986-03-05 Micropore International Ltd Electric radiation heater
DE3737475A1 (de) * 1987-11-05 1989-05-18 Ego Elektro Blanc & Fischer Strahlheizkoerper fuer kochgeraete

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3406604C1 (de) * 1984-02-23 1985-07-25 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Heizeinrichtung fuer Strahlungsheizstellen mit elektrischen Strahlungsheizelementen
EP0164900A1 (fr) * 1984-05-15 1985-12-18 Ge Lighting Limited Appareil de chauffage
EP0206597A1 (fr) * 1985-06-11 1986-12-30 Micropore International Limited Appareils de chauffage à infra-rouge
GB2186166A (en) * 1986-01-24 1987-08-05 Redring Electric Ltd Electric hobs and heating units therefor
EP0265635A1 (fr) * 1986-10-17 1988-05-04 E.G.O. Elektro-Geräte Blanc u. Fischer Elément chauffant à radiation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2287388A (en) * 1994-03-09 1995-09-13 Ceramaspeed Ltd Glass ceramic top cooking appliance
GB2287388B (en) * 1994-03-09 1997-07-16 Ceramaspeed Ltd Radiant electric heater

Also Published As

Publication number Publication date
EP0383014A3 (fr) 1992-03-11
US5032706A (en) 1991-07-16
DE3904177A1 (de) 1990-08-16

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