EP0305633A2 - Elément chauffant rayonnant pour appareils de cuisson comprenant un élément chauffant rayonnant à forte intensité ou haute température - Google Patents

Elément chauffant rayonnant pour appareils de cuisson comprenant un élément chauffant rayonnant à forte intensité ou haute température Download PDF

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Publication number
EP0305633A2
EP0305633A2 EP88100897A EP88100897A EP0305633A2 EP 0305633 A2 EP0305633 A2 EP 0305633A2 EP 88100897 A EP88100897 A EP 88100897A EP 88100897 A EP88100897 A EP 88100897A EP 0305633 A2 EP0305633 A2 EP 0305633A2
Authority
EP
European Patent Office
Prior art keywords
radiant heater
edge
cover
heater according
heating element
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
EP88100897A
Other languages
German (de)
English (en)
Other versions
EP0305633B1 (en
EP0305633A3 (fr
Inventor
Gerhard Goessler
Felix Schreder
Eugen Wilde
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
Priority claimed from DE3503648A external-priority patent/DE3503648C2/de
Application filed by EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Priority to AT88100897T priority Critical patent/ATE88607T1/de
Priority claimed from EP85111791A external-priority patent/EP0176027B1/fr
Publication of EP0305633A2 publication Critical patent/EP0305633A2/fr
Publication of EP0305633A3 publication Critical patent/EP0305633A3/fr
Application granted granted Critical
Publication of EP0305633B1 publication Critical patent/EP0305633B1/de
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
    • H05B3/74—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
    • 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 for cooking appliances with at least one bright or high-temperature radiant heating element according to the preamble of claim 1.
  • Such a radiant heater has become known, for example, from GB-PS 1 273 023.
  • a bright heater element it contains halogen lamps that emit their energy in the visible and infrared range and thus shine through a glass ceramic plate. Due to the low thermal mass, the heating-up times are quite short, and the operator also has good control over the function due to the light emission.
  • the high luminosity of the halogen lamps in the visible range also brings prob leme with itself, especially when good insulation of the special cooking area from other areas is desired.
  • GB-A 2 132 060 shows a radiant heater with four light emitters which protrude with their pistons through an edge recess and are connected by means of end bases attached to a carrier sheet metal shell. A protrusion of an insulating ring covers the connection area upwards.
  • US-A 3 355 574 shows a single hotplate with four light emitters, the flattened ends of which are partially provided with a metallic connection socket which protrude through slots in the edge of a metal carrier shell.
  • the object of the invention is to provide a radiant heater of the type mentioned which, with good thermal insulation, provides an optically good glow or light pattern.
  • the radiation shield can be formed by an annular insulating cover plate which, lying on the edge, is pressed onto the cooking surface and, because it preferably consists of a denser but temperature-resistant insulating material, is cut out with relatively sharp edges. If it protrudes inward beyond the actual edge, which is made of highly insulating but less rigid material, then it alone determines the visual effect of the hob, and it is avoided that the cooking surface looks "frayed" due to a blurred inner boundary.
  • the radiation shield can additionally or instead of the cover panel consist of a light-absorbing and / or reflecting layer on the connection ends of the light emitter. This prevents light from penetrating from the ends of the light emitter into the area of the cooking appliance lying outside the cooking zones and illuminating the glass ceramic plate in this area, usually unevenly, from below, which is visually disturbing and could also contribute to uncertainty for the operator.
  • the radiation shielding can also be provided as a cover for a connection end of the light heater element, which can be part of the insulation and particularly preferably part of the cover panel. A combination of these measures is particularly preferred.
  • a radiant heater 11 which is arranged below a cooking surface 15 made of glass ceramic. It heats the cooking surface 15 from below and thus forms a hotplate on which cooking vessels can be heated.
  • the radiant heater 11 contains an insulating support 24 which is bowl-shaped and lies in a sheet metal shell 12.
  • a cover panel 114 is arranged in the form of a ring made of a material that is denser and stronger than the insulating support 24, but also high-temperature resistant and insulating material, which has its inner edge 81 over the inner edge 80 of the edge 22 protrudes somewhat inwards.
  • the upper face of the cover panel lies against the underside of the cooking surface 15 and is usually pressed against it by a spring force acting on the sheet metal shell 12.
  • two bright radiator heating elements 20 are provided, which can also be referred to as high-temperature radiant heaters and, as already described, consist of high-temperature heating coils 83 enclosed in quartz pistons 82, which emit radiation far in the visible range and at temperatures far above 1500 K (approx. 1200 ° C). They are in the form of elongated rods or festoons which have a flattened section 84 at both ends, from which the connection ends 21 protrude and are welded there to connection lines. In the example, two light emitters 20 are arranged in parallel and at a distance from one another which corresponds to approximately half the diameter of the radiant heater.
  • dark radiator heating elements 25 are arranged, which consist of heating coils of conventional resistance materials used for radiant heaters, for example an iron / chrome / aluminum Alloy that can be used up to temperatures of approx. 1500 K (1200 ° C) without encapsulation or protective gas atmosphere.
  • These heating coils are arranged in a shape that is adapted to the shape of the respective dark radiator heating zone 27 in a substantially spiral manner and are secured by partial embedding in the material of the insulating support, for example in accordance with DE PS 27 29 929.
  • the insulating support at a distance from the light radiator 20 can have the shape of a flat, arc-shaped groove 85, in order to achieve targeted reflection to achieve the radiation.
  • the light emitters and dark emitters are switched on in parallel, in series or individually using selector switches, power or temperature controls or controls, the light emitters being switched on particularly in the parboiling range or in the higher power range, because this is where they best demonstrate their advantages of the relatively low-inertia rapid heating can.
  • edge recesses 86 which are adapted to the shape of the light emitter tube and narrow towards an outer opening 87 which are designed to receive the flattened connection end 84 of the light emitter.
  • This flattened end is vertical therein, so that the light radiator is guided in the transverse and longitudinal directions in the edge recess 86, 87.
  • the edge recess is provided in FIGS. 1 to 3 in the edge 22 and is open at the top.
  • the cover 81 covers the opening of the edge recess and thus shields it from the top, so that it is not visible from above.
  • the end section, and in particular the flattened section 84 is coated with a light-absorbing or reflecting layer 89 which in particular also the end faces 91 of the Ab cut 84 covers.
  • This layer could, for example, reflect inwards and outwards black for the radiation affected here and possibly consist of two layers arranged one above the other, for example a vapor-deposited metal layer and a layer of a highly heat-resistant lacquer applied above, as is also used for coloring hotplates finds.
  • At least the area that protrudes from the outer opening 87 into the space 88 should be covered with the layer 89, but other areas of the end section 90 can also be coated in order to protect the area of the edge recess 86, 87 from direct radiation as far as possible.
  • the temperature in section 84 can thereby be lowered, which is very desirable because a critical point of halogen spotlights is the temperature at the pinch point through which the connection 21 is led to the outside. If this temperature rises too high, the tightness of the lamp could be jeopardized by oxidation processes at the lead-through point.
  • the embodiment according to FIGS. 4 and 5 is the same as that according to FIGS. 1 to 3 except for the following differences:
  • the cover panel 114a consists of a relatively thick ring which has an almost square cross section. It too projects inwards with its inner edge 81 over the inner edge 80 of the edge 22 of the insulating support 24.
  • the edge recesses for the two end sections of the light radiator 20 are each divided into two sections, of which the section 86a lies in the region of the insulating support 24, while the section 86b is arranged in the region of the cover panel 114a.
  • the same, essentially central division into two applies to the outer opening 87 for the flattened section 84, so that the light radiator 20 is securely fixed by placing the cover panel 114a on the edge 22.
  • the flattened section 84 protrudes from the outer opening 87 with most of its length.
  • a cover 92 which is formed as a projection on the cover panel 114 and partially surrounds the end section at a good distance upwards, on both sides and in the region of the end face.
  • the shielding of the end face 91 is particularly important because the radiation exits there particularly intensively, as from a light guide.
  • the edges 93 of the cover 92 surrounding the end section 84 extend to the lower level of the cover panel 114a and thus to the central plane of the light radiator.
  • this division plane can also be set further up or preferably down with respect to the light radiator in order to be able to encompass the end section 90 even further with the edge 93.
  • the distance with which the light emitter end is surrounded is important, so that heat can be dissipated from there and the end is not overheated.
  • a combination of the two embodiments with the cover 92 and the layer 89 is particularly preferred.
  • cover panel with cover 92 care should be taken that in particular the cover 92 is largely opaque, which can be done on the one hand by a special compression of the material, for example a ceramic fiber made of aluminum dioxide, which is known under the trade name 'Fiberfrax' by appropriate opaque coating or both. Since the opacity is also desired for the cover panel, this purpose can also be achieved by appropriate coloring or choice of an absorbent binder.
  • the material of the cover plate should be hardened by mineral binders in order to obtain the exact edge on the inner edge that determines the optical edge of the cooking surface. Due to the arrangement in which only the flattened end section protrudes through the outer opening 87, a large part of the emerging light is already shielded in the area of the edge recess 86.
  • the entire flattened section 84 it would also be possible to allow the entire flattened section 84 to protrude, although its inclusion in the edge recess enables the halogen lamp to be guided securely, also against rotation, which is important, for example, if the light source itself has a reflective layer on the outside or inside of its bulb 82 having. It is also advantageous above all that the arrangement according to the invention makes it possible to avoid expensive end bases. Because of the radiation conditions from the light emitter end sections 90, the edge 93 of the cover 92 is particularly important because it retains the majority of the undesired radiation. It would also be possible to form the cover from the material of the insulating support 24, if one provides for a corresponding compression and opacity with adequate ventilation of the end.
  • cover parts on the ring and insulating support which, for example, are so different in the size of their edge that they overlap in height, but leave a sufficient gap between them for ventilation. This would form a labyrinth-like cover that practically does not let light escape.
  • a cover of the basic shape of the cover 92 shown in FIG. 5 could be provided on the insulating support, while the cover provided on the cover panel 114a is in particular made larger with its edge and overlaps the cover provided underneath.
  • the invention is also suitable for radiant heaters containing only light emitters.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Electric Stoves And Ranges (AREA)
  • Electric Ovens (AREA)
EP88100897A 1984-09-22 1985-09-18 Radiative heating body for a cooking apparatus with a high-intensity or a high-temperature radiation-heating element Expired - Lifetime EP0305633B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88100897T ATE88607T1 (de) 1984-09-22 1985-09-18 Strahlheizkoerper fuer kochgeraete mit einem helloder hochtemperatur-strahlungsheizelement.

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE3434839 1984-09-22
DE3434839 1984-09-22
DE3503648A DE3503648C2 (de) 1984-09-22 1985-02-04 Strahlheizkörper für Kochgeräte
DE3503648 1985-02-04
EP85111791A EP0176027B1 (fr) 1984-09-22 1985-09-18 Elément chauffant à rayons pour appareils de cuisson

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP85111791A Division EP0176027B1 (fr) 1984-09-22 1985-09-18 Elément chauffant à rayons pour appareils de cuisson
EP85111791.1 Division 1985-09-18

Publications (3)

Publication Number Publication Date
EP0305633A2 true EP0305633A2 (fr) 1989-03-08
EP0305633A3 EP0305633A3 (fr) 1989-06-07
EP0305633B1 EP0305633B1 (en) 1993-04-21

Family

ID=27192366

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88100897A Expired - Lifetime EP0305633B1 (en) 1984-09-22 1985-09-18 Radiative heating body for a cooking apparatus with a high-intensity or a high-temperature radiation-heating element

Country Status (2)

Country Link
EP (1) EP0305633B1 (fr)
AT (1) ATE40625T1 (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

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1111556A (fr) * 1953-08-24 1956-03-01 Lampes Sa Appareil générateur de rayons infra-rouges
DE1909394A1 (de) * 1968-03-13 1969-10-23 Philips Nv Verfahren zur Herstellung einer Halogengluehlampe,die mit einer einen Teil des abgestrahlten Lichtes abfangenden Abschirmung versehen ist
DE1496072A1 (de) * 1962-03-15 1970-04-30 Corning Glass Works Ultraviolettstrahlung absorbierendes Filtermaterial und daraus hergestellte elektrische Lampe
FR2267674A1 (en) * 1974-04-12 1975-11-07 Landeroin Odette Heating element of resistance wire - consists of support on which the heating wire is wound inserted into an evacuated tube
DE2818815A1 (de) * 1978-04-28 1979-11-08 Sueddeutsche Metallwerke Gmbh Infrarot-halogengluehlampe
US4251716A (en) * 1978-11-30 1981-02-17 General Electric Company Self-cleaning glass-ceramic surface cooking unit
EP0035280A2 (fr) * 1980-03-05 1981-09-09 Grünzweig + Hartmann und Glasfaser AG Dispositif d'isolation thermique d'une source de chaleur
FR2488680A1 (fr) * 1980-08-13 1982-02-19 Micropore International Ltd Cuisiniere electrique
GB2132060A (en) * 1982-12-24 1984-06-27 Thorn Emi Domestic Appliances Heating apparatus
DE3442804A1 (de) * 1984-11-23 1986-06-05 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Strahlungsheizung fuer kochplatten, insb. glaskeramik-kochplatten
DE3503649A1 (de) * 1985-02-04 1986-08-07 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Strahlheizkoerper fuer kochgeraete mit einem hell- oder hochtemperatur-strahlungsheizelement

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1111556A (fr) * 1953-08-24 1956-03-01 Lampes Sa Appareil générateur de rayons infra-rouges
DE1496072A1 (de) * 1962-03-15 1970-04-30 Corning Glass Works Ultraviolettstrahlung absorbierendes Filtermaterial und daraus hergestellte elektrische Lampe
DE1909394A1 (de) * 1968-03-13 1969-10-23 Philips Nv Verfahren zur Herstellung einer Halogengluehlampe,die mit einer einen Teil des abgestrahlten Lichtes abfangenden Abschirmung versehen ist
FR2267674A1 (en) * 1974-04-12 1975-11-07 Landeroin Odette Heating element of resistance wire - consists of support on which the heating wire is wound inserted into an evacuated tube
DE2818815A1 (de) * 1978-04-28 1979-11-08 Sueddeutsche Metallwerke Gmbh Infrarot-halogengluehlampe
US4251716A (en) * 1978-11-30 1981-02-17 General Electric Company Self-cleaning glass-ceramic surface cooking unit
EP0035280A2 (fr) * 1980-03-05 1981-09-09 Grünzweig + Hartmann und Glasfaser AG Dispositif d'isolation thermique d'une source de chaleur
FR2488680A1 (fr) * 1980-08-13 1982-02-19 Micropore International Ltd Cuisiniere electrique
GB2132060A (en) * 1982-12-24 1984-06-27 Thorn Emi Domestic Appliances Heating apparatus
DE3442804A1 (de) * 1984-11-23 1986-06-05 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Strahlungsheizung fuer kochplatten, insb. glaskeramik-kochplatten
DE3503649A1 (de) * 1985-02-04 1986-08-07 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Strahlheizkoerper fuer kochgeraete mit einem hell- oder hochtemperatur-strahlungsheizelement

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
ATE40625T1 (de) 1989-02-15
EP0305633B1 (en) 1993-04-21
EP0305633A3 (fr) 1989-06-07

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