EP1003352A2 - Eléments de chauffage électrique rayonnants et son procédé de fabrication - Google Patents

Eléments de chauffage électrique rayonnants et son procédé de fabrication Download PDF

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Publication number
EP1003352A2
EP1003352A2 EP99122547A EP99122547A EP1003352A2 EP 1003352 A2 EP1003352 A2 EP 1003352A2 EP 99122547 A EP99122547 A EP 99122547A EP 99122547 A EP99122547 A EP 99122547A EP 1003352 A2 EP1003352 A2 EP 1003352A2
Authority
EP
European Patent Office
Prior art keywords
edge
intermediate edge
radiant heater
band
height compensation
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Withdrawn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
EP99122547A
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German (de)
English (en)
Other versions
EP1003352A3 (fr
Inventor
Eugen Wilde
Manfred Hasenfus
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 Geratebau 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 Geratebau GmbH filed Critical EGO Elektro Geratebau GmbH
Publication of EP1003352A2 publication Critical patent/EP1003352A2/fr
Publication of EP1003352A3 publication Critical patent/EP1003352A3/fr
Withdrawn legal-status Critical Current

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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
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/744—Lamps as heat source, i.e. heating elements with protective gas envelope, e.g. halogen lamps

Definitions

  • the invention relates to a radiant heater with a electric heating, which is at least one that radiates helically during operation Heating element, preferably in the manner of a halogen lamp, contains and with a radiator support that has a thermal Contains insulation with a floor and an outer edge that leads to Plant on the underside of a hotplate, preferably one Glass ceramic plate, is formed.
  • Radiant heaters of this type are known from EP 0 176 027 B. known. Because of the bright light that the light emitter sends out, and its signal function through the glass ceramic plate through it is expedient to turn the light on Limit the area of the heating zone. This is suggested there a ring with a ring on the outer edge at least on the inside of a sharply delimited edge. about the radiant heater connects this ring to the glass ceramic plate pressed and thus creates a sharp image of the heating zone.
  • the object of the invention is to address the problems of To fix the prior art and in particular a radiant heater to create the one in its execution as a two-circuit radiator, a sharp image of each heated zone, especially the central zone, through the glass ceramic plate to achieve.
  • the intermediate edge can largely consist of opaque insulation material, for example vermiculite be produced and preferably on a highly heat-insulating and heat-resistant microporous insulation material, for example pyrogenic silica, existing soil be put on.
  • the height compensation means that Height of the intermediate edge adapted to that of the outer edge become.
  • the light shielding prevents light emerges from the central zone. It is also possible that Intermediate margin between two adjacent heating zones to provide, such as in an elongated or oval radiator that is a circular and one or two contains additional heating zones in the shape of a crescent moon.
  • the height compensation means and also the light shielding are preferred in the area of the dividing line between the intermediate edge and floor provided. There is constructive freedom larger than e.g. on the upper edge of the intermediate edge. Especially it is preferred if the height compensation means and possibly also the light shield at least one in the ground engaging, preferably penetrating into this element contains. Height adjustment means and light shielding can be used be united in one element.
  • This tape is used for radiators, for example the Hilight radiators (registered trademark of E.G.O. Elektro-Gedorfebau GmbH) used as electrical heating elements.
  • Halogen lamp instead of Halogen lamp is another bright radiating heating element can be used, for example based on molybdenum desilicit.
  • the tape described consists of very thin metallic Material with a wave depth and division (period) is in the order of magnitude between 2 mm and 6 mm.
  • Height compensation means and at the same time also light shielding it can be used in different ways.
  • the tapes serving as heating conductors be pressed into the surface of the insulating body floor, which is why it usually has protrusions ("feet") on the underside.
  • protrusions "feet"
  • an intermediate edge in the form of a ring with light-shielded height compensation should be provided, so together with the tapes used as heating conductors a ring that is only open at the point of connection the band are pressed into the ground.
  • the intermediate margin is placed, which is additionally held with holding means, for example, some from the bottom margin protruding pins is provided.
  • the ribbon and the edge are dimensioned so that the edge over the Level of the outer edge protrudes.
  • the intermediate edge pressed down until it lies flat with the outer edge.
  • the tape digs deeper into the insulation floor on. The result is a height-adjusted and light-tight Graduation.
  • the intermediate edge is countered by the pins lateral displacement and against falling out during transport secured.
  • the tape or other metallic barrier may be out its function as a height compensation means or light shield also perform electrically active functions. It could for example if it is outside the intermediate margin, as a heating element or, if it is covered by the intermediate ring, can be used as a series resistor or as a supply line for heating elements or for measuring functions.
  • the intermediate ring itself through a corresponding, for example cutting-edge design be pressed into the ground to adjust the height.
  • additional holding means in the form of Pins or the like may be provided.
  • a light shield bring about while by an appropriate number of Pins the height compensation and holding function is effected.
  • plastic mass such as glue, used to make the Hold ring at the bottom, for example in a groove.
  • glue used to make the Hold ring at the bottom, for example in a groove.
  • Figures 1 to 3 show an electric radiant heater 11 for heating a ceramic hob Cooking hob or a stove, under which several radiators can be arranged.
  • a sheet metal carrier shell 13 thermal insulation arranged one essentially has flat floor 14, which consists of a highly heat-resistant, microporous insulation material, possibly with fibers is armored.
  • Particularly suitable as a basic insulation material fumed silica, in the form of tiny Hollow bodies are present. Loose bulk material becomes a tablet pressed out of it and this into the carrier shell inserted or pressed.
  • the thermal insulation is increased by a slightly higher Shoulder 15 of the bottom overlying outer edge 16, the on the inside of the edge formed by the carrier shell 17 rests and an upper, on the underside of the glass ceramic plate has adjacent ring surface 18.
  • the outer edge consists of a mechanically more rigid design than the floor, but not quite as good thermal insulation material, for example a mainly vermiculite (expanded mica) containing insulation material, the additional reinforcing fibers and fumed silica to improve the heat insulation shadow may contain. This can be done well in one Create ring shape and has enough sharp edges to limit the heating zone of the radiant heater.
  • the radiant heater is a so-called two-circuit heater with an inner, central heating zone 19 and one of these ring-shaped outer heating zone 20.
  • the dual-circuit radiator could also have an overall elongated shape a circular main heating zone and additional side heating zones exhibit.
  • the intermediate margin consists of a not translucent, so either absorbent or reflective material.
  • a material is preferably corresponding that of the outer edge, for example that above described vermiculite material.
  • Heating elements arranged, in the outer heating zone 20th and in the center of the central heating zone 19 band heating element 27.
  • They consist of a very thin band of heating conductor material, for example, an iron-chromium alloy, the Thickness on the order of less than 0.1 mm, preferably is between 0.03 mm and 0.07 mm.
  • the width can be accordingly the resistance and performance ratios vary between 2 mm and 8 mm.
  • the band is very tight corrugated, with a wave height of apex to Parting between 2 mm and 4 mm and one in the same size range lying wave period.
  • projections 28 may be provided formed by punching out the heating conductor tape accordingly are and because they are used to attach the heating conductor tape in the Thermal insulation bodies are pressed in, also as "feet" can be designated. Because their distance from each other is essential is larger than a wave period and if possible also does not correspond to an integer multiple of a wave period, they also have a curved wave structure Projections each have a slightly different shape, which is theirs Definition in the insulation material benefits. Such Heating conductor tapes are described in EP 0 590 315 A which is referred to here for the details.
  • the band radiators 27 shown in Fig. 1 are in shape several circular, parallel paths relocated, between each of which a turn 29 is provided.
  • the conductor tracks in the middle zone are each in concentric Half circles laid, with the respective turns 29 create a free alley between them, which under the rod-shaped sensor 30 of a temperature limiter 31 runs, between the heating elements and the glass ceramic plate is arranged and through corresponding openings in protrudes through the edges 16, 21.
  • Halogen light emitter 32 arranged. It refers to a radiator built in the manner of a halogen lamp, the in an essentially circularly curved quartz glass tube has a tungsten heating coil 33 in a halogen atmosphere.
  • This halogen lamp ring surrounds the band heating element 27 in the middle zone. Its connecting ends 34 are over the outer heating zone led to a connector 35, the is in the same range as the connections 36 of the band heater 27.
  • This area is for light shielding from one Plate 37, which is made of temperature-resistant material, for example a bound mica sheet (trade name "Mikanit"). Also a ceramic cover, like from the EP 0 176 027 B known is possible.
  • the heating elements 27, 32 are switched so that either only the central zone 19 alone or both heating zones 19, 20 together can be switched on to heat different cooking vessel sizes to be able to adapt.
  • Band radiators 27 the halogen lamp upstream in series so that they the due to the strong positive resistance temperature coefficient of the wire high inrush current of the halogen lamp 32 limit.
  • the band radiator exposed to the atmosphere and are not encapsulated, also reach temperatures in the Field of bright red heat. However, their light emission is not as intense as the almost white light of the halogen lamp.
  • edges 16, 21 serve on the one hand for thermal separation the heating zones from each other and from outside, on the other hand, also for visual delimitation. This applies especially for the central zone with its light emitter 32. Its light would also be due to the high intensity only small holes or cracks in the area of the intermediate margin also those lying outside the central heating zone 19 Illuminate areas and thus also through the glass ceramic plate 12 the circular image of the middle one Falsify the heating zone. This optical demarcation is one of them provided to display the operating state to the user and the exact positioning of the cooking vessel on the heating zone facilitate.
  • the Height compensation means 23 are provided. Without this you could in particular in the manufacturing and assembly process Insulation parts do not achieve a gap-free alignment.
  • the height compensation means 23 exist in the embodiment 1 to 3 of several distributed over the circumference Pins 39 that are in the vermiculite intermediate ring 21 its bottom embedded in the manufacturing process or are pressed in. They are so long that they go far into that Insulation material of the floor 14 penetrate and so numerous, that even in the not completely penetrated state (see Fig. 2) the intermediate ring 21 against lateral displacement and against falling out in the upturned state (e.g. with the Assembly). At the same time, they form the holding means 24th
  • the Band heater In the manufacture of the radiant heater 11, the Band heater with their projections 28 (Fig. 7) or with a lower straight edge (corresponding to Fig. 8) in the Pressed in bottom 14.
  • the band heater 27 in Grooves of a die inserted and against the compressed Insulation material pressed, the projections 28 or the lower Edge of the tapes penetrate into the insulation material and get into it set while keeping the floor on its intended Thickness is pressed.
  • a band 40 is also pressed in under the intermediate edge 21, as indicated in Fig. 1, almost one circumscribes the whole circle and only in the area of the connections, where plate 37 provides light shielding is interrupted.
  • This band 40 may preferably be a corrugated tape of the same type and shape as that Schuleiterband 27. It is in height and embedding depth in Floor 14 dimensioned so that it is in the embedding state when the Intermediate edge 21 is placed, slightly above level 22 stands up.
  • the tape 40 can also be an elongated or zigzag folded Tape or a strip of other heat-resistant Material.
  • the manufacturing process for the radiant heater is followed by the introduction of the prefabricated in the form of a tablet Bottom into the carrying shell lying in a holding tool 51 13 and the pressing of the band heater 27 and the Band 40 of the outer ring 16 inserted, which is on the sheet metal edge 17 centers and holds.
  • the intermediate edge 21 with the inside molded pins 39 are placed over the band 40, pins 39 outside band 40 into floor 14 stab.
  • a level 22 representing tool 50 for example a plate
  • the intermediate edge 21 pressed so far that its upper Edge 38 with the annular surface 18 of the outer edge in the level 22, for example in one plane, or when springback is to be feared a little further.
  • Fig. 3 shows that the band 40 at four over the Scope evenly distributed places (Fig. 1) inwards protruding over the inner edge of the intermediate edge, e.g. Star shaped sections, protrusions or Bulges 43 has. They are below the intermediate margin 21 interlocked so that the 40 formed light barrier is retained. They are used for Side centering and positioning of the halogen lamp 32. Due to the elasticity of the band and the only pointwise Touch is the pressed band 40 to cooperate excellently suitable with the halogen lamp. It saves special measures to determine the halogen lamp.
  • the band 40 can be made without large Additional effort pressed in together with the band radiators 27 and pins 39 would be used to fix the intermediate ring required anyway. Vermiculite or something similar Batch made intermediate ring creates a clear and optical boundary edge not at risk of damage 44.
  • the band 40 also take on other tasks. So could it also the task of a series resistor for the halogen lamp take over if e.g. no heating elements in the central zone with lower temperature level (ribbon or wire spiral heating conductor) be used as the light emitter.
  • the tape would act as a series resistor for a very short time of, for example, a fraction of a second be switched on by an electronic circuit, what with the short glow time of the halogen lamp would suffice to dampen the inrush current.
  • the recorded one Energy is so low due to the short time that the tape despite its thermal shielding by the intermediate edge 21 is not overloaded.
  • Fig. 4 to 7 show a radiant heater with the 1 to 3 except for the following differences:
  • the intermediate edge 21 is already in its manufacture provided with the band 40. It is like Figures 6 through 8 show in the lower surface 42 of the intermediate ring 21 embedded, either in the formation of the intermediate ring by molding (extrusion) or afterwards indented. 7 with the projections 28 ("feet") is particularly suitable for retrofitting Press in while the embodiment according to FIG. 8 is straight Band edge is more suitable for molding.
  • the ring-shaped The intermediate edge 21 has a passage below the plate 37 45 for the lamp ends and heating conductor connections. By doing Passage, the plate 37 is fixed.
  • the one with the one below is used Band 40 provided intermediate edge 21 on the bottom 14 attached and the band through which the glass ceramic plate 12th symbolizing stamp 50 (see Fig. 2a) so far in the Material of the bottom 14 pressed in until the level reaches 22 is.
  • the band 40 forms simultaneously the height compensation, holding and light shielding means.
  • Fig. 9 shows an embodiment in which the light shield achieved by an overlap of bottom 14 and intermediate edge 21 becomes.
  • the intermediate edge 21 penetrates in the assembled state with its lower end in a circumferential groove or recess 46 in the bottom 14 and is by a larger number held by pins 39, the height compensation and holding means form.
  • a groove one could be inside or outside the intermediate edge 21 circumferential rib in Bottom 14 or other overlapping training provided his.
  • the tape Choose 40 e.g. a mica product. This can also be very thin, e.g. less than 1 mm, and e.g. in the material of the Be embedded.
  • In the margin there could be a circumferential groove are provided in which the non-corrugated band intervenes.
  • a two-part, through a light-tight "Sliding seat" interconnected version of the intermediate ring is possible.
  • Fig. 10 shows schematically an embodiment in which the Intermediate edge 21 on its underside a rib-like has continuous projection 47 which in a groove 46 on Floor 14 engages.
  • plastic and possibly hardening adhesive 48 e.g. a ceramic glue. You can as revolving caterpillar or only in places.
  • the intermediate ring which due to its Dimensioning and that of the adhesive when placed on it will rise above level 22, of which the level manufacturing adjustment tool 50 (Fig. 2a) under lateral Displacement of the adhesive depressed until the level 22 is reached.
  • the then setting or hardening adhesive forms the height compensation and holding means and acts, in addition to the tongue-and-groove labyrinth 46, 47 for Light shielding with.
  • Fig. 11 shows an embodiment in which, in the rest same design as in FIG. 10, the adhesive 48 in addition to pins 39 is provided.
  • the adhesive 48 needs the adhesive both for height adjustment and to take on only partial tasks when holding.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Electric Stoves And Ranges (AREA)
EP99122547A 1998-11-20 1999-11-12 Eléments de chauffage électrique rayonnants et son procédé de fabrication Withdrawn EP1003352A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1998153542 DE19853542A1 (de) 1998-11-20 1998-11-20 Strahlungsheizkörper und Verfahren zu seiner Herstellung
DE19853542 1998-11-20

Publications (2)

Publication Number Publication Date
EP1003352A2 true EP1003352A2 (fr) 2000-05-24
EP1003352A3 EP1003352A3 (fr) 2001-03-14

Family

ID=7888431

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EP99122547A Withdrawn EP1003352A3 (fr) 1998-11-20 1999-11-12 Eléments de chauffage électrique rayonnants et son procédé de fabrication

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EP (1) EP1003352A3 (fr)
DE (1) DE19853542A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4789772A (en) * 1985-06-11 1988-12-06 Micropore International Limited Infra-red heaters
EP0551172A2 (fr) * 1992-01-10 1993-07-14 Ceramaspeed Limited Plaque de cuisson en vitro-céramique muni de plusieurs zones de chauffage
EP0671863A2 (fr) * 1994-03-09 1995-09-13 Ceramaspeed Limited Elément de chauffage électrique royannant
EP0771134A2 (fr) * 1995-10-27 1997-05-02 E.G.O. ELEKTRO-GERÄTEBAU GmbH Elément de chauffage radiant

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0176027B1 (fr) * 1984-09-22 1989-02-01 E.G.O. Elektro-Geräte Blanc u. Fischer Elément chauffant à rayons pour appareils de cuisson
DE3903978A1 (de) * 1989-02-10 1990-08-16 Imp Werke Gmbh Lichtkochstelle mit mindestens zwei infrarotroehren
GB2325604A (en) * 1997-05-22 1998-11-25 Ceramaspeed Ltd Electric heater support insulation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4789772A (en) * 1985-06-11 1988-12-06 Micropore International Limited Infra-red heaters
EP0551172A2 (fr) * 1992-01-10 1993-07-14 Ceramaspeed Limited Plaque de cuisson en vitro-céramique muni de plusieurs zones de chauffage
EP0671863A2 (fr) * 1994-03-09 1995-09-13 Ceramaspeed Limited Elément de chauffage électrique royannant
EP0771134A2 (fr) * 1995-10-27 1997-05-02 E.G.O. ELEKTRO-GERÄTEBAU GmbH Elément de chauffage radiant

Also Published As

Publication number Publication date
DE19853542A1 (de) 2000-05-25
EP1003352A3 (fr) 2001-03-14

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