EP0176063A1 - Elément chauffant à rayonnement pour appareils de cuisson - Google Patents

Elément chauffant à rayonnement pour appareils de cuisson Download PDF

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Publication number
EP0176063A1
EP0176063A1 EP85111989A EP85111989A EP0176063A1 EP 0176063 A1 EP0176063 A1 EP 0176063A1 EP 85111989 A EP85111989 A EP 85111989A EP 85111989 A EP85111989 A EP 85111989A EP 0176063 A1 EP0176063 A1 EP 0176063A1
Authority
EP
European Patent Office
Prior art keywords
radiant heater
edge
cover
light
light emitters
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
EP85111989A
Other languages
German (de)
English (en)
Other versions
EP0176063B1 (fr
Inventor
Gerhard Gössler
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25824987&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0176063(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
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 AT85111989T priority Critical patent/ATE53272T1/de
Publication of EP0176063A1 publication Critical patent/EP0176063A1/fr
Application granted granted Critical
Publication of EP0176063B1 publication Critical patent/EP0176063B1/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
    • H05B3/74—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
    • 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

Definitions

  • the invention relates to a radiant heater for cooking appliances with a glass ceramic plate, with electric bright radiator heating elements, which operate as intended at an elevated temperature above 1500 K (approx. 1200 degrees Celsius) and whose radiation spectrum extends considerably into the visible range.
  • Such radiant heaters are known for example from GB-PS 1 273 023.
  • a light source heating element they have 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 light source is arranged there in the form of a circle. These light emitters are difficult to manufacture and regulate and have a short lifespan.
  • this object is achieved in that the straight light emitters are arranged in the form of a polygon in the edge region of the radiant heater.
  • the heating elements referred to as light emitters, reach permissible maximum temperatures that exceed 2000K (approx. 1700 degrees Celsius). However, it may well be that the temperature is below the specified temperature limit in the down-regulated state.
  • halogen lamps in a straight rod shape with connections on both sides is particularly preferred. These light emitters can be produced economically and, particularly in the arrangement described, have good controllability and a long service life.
  • the glass-ceramic plate is no longer heated as strongly when using light emitters, especially if it is made of a material that is well permeable to the specific radiation area, a temperature limitation should be provided for the glass-ceramic due to the risk of thermal damage.
  • a rod-shaped temperature sensor can be used for this.
  • radiation shielding can be provided in the edge area. It can be of an annular insulating cover be formed aperture, which, lying on the edge, is pressed against the cooking surface and, because it preferably consists of a denser but temperature-resistant insulating material, be cut out with relatively sharp edges. If it protrudes somewhat 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 shielding can additionally or instead of the cover panel consist of a light-absorbing 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 outside the cooking zones and illuminating the glass ceramic plate in this area, usually unevenly, from below, which is visually disturbing and would also lead to undesired heating of the cooking appliance .
  • 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.
  • an insulation 13 is arranged in a flat sheet metal shell 12, onto which a ring 14 made of somewhat stronger insulating material than that of the layer 13, which bears against the underside of the glass ceramic plate, is placed in the edge region.
  • the radiant heater 11 heats a cooking vessel 16 through this glass ceramic plate 15.
  • a temperature limiter 17 with a rod-shaped temperature sensor 18 protrudes beyond the heated area of the radiant heater and contains switches 19 in its switch head arranged outside the area of the shell 12, which supply the power to the radiant heater influence and possibly switch off partial heating elements.
  • light emitters 20 which are designed as straight halogen lamps, which contain, for example, a tungsten filament which is contained in a quartz glass tube in a halogen atmosphere and is supported by intermediate webs.
  • a tungsten filament which is contained in a quartz glass tube in a halogen atmosphere and is supported by intermediate webs.
  • Such radiators are described in GB-PS 173 023, to which reference is made. Its filament works at temperatures in the order of 2400 K (2100 degrees Celsius) and, in addition to an infrared component, also generates a high proportion of visible light in the white area.
  • the glass ceramic plate 15 is set up to at least partially let through this spectral range, while a part of the heat is converted in the glass ceramic plate and is released from there to the cooking vessel 16 by contact etc.
  • the light emitters 20 have connections 21 on both sides, which protrude beyond the edge 22 of the sheet metal shell 12 and are connected there with corresponding connecting lines.
  • the ends of the three light emitters 20 protrude through the edge 14 and are located with their radiating area within the circular heated surface 23 of the radiant heater, which is formed in the bowl-shaped interior of the radiant heater.
  • FIG. 1 and 2 show an embodiment in which four straight, rod-shaped tell-emitters 20 are arranged in the shape of a square so that their radiating areas lie within the heated region 23 of the circular radiant heater. Adjacent light emitters are offset in height from each other in such a way that they cross each other in the area of the connection ends and are so easy to connect. But they can also be arranged in one level.
  • the rectangular, preferably quadrilaterally enclosed, central region is designed as a dark radiator cine 27 and is covered with conventional heating resistance coils in a zigzag pattern.
  • the dark emitters 25 exist from heating coils made of resistance wire, for example an iron / chrome / aluminum alloy, which is used up to temperatures of approx. 1500 K (1200 degrees Celsius).
  • the light emitters form a light emitter heating zone 28 surrounding the dark emitter heating zone 27.
  • FIGS. 1 and 2 and 3 an arrangement is shown in which three straight rod-shaped light emitters 20 in the form of an equilateral triangle are arranged in a similar manner as in FIGS. 1 and 2.
  • a dark emitter heating zone 27 in which a dark radiator heating element 25 is arranged in the form of a spiral from a resistance coil.
  • a coating 59 made of titanium dioxide is applied to the insulating layer 13, which gives a good reflection of the radiation from the light emitters.
  • FIG. 5 and 6 show two rows of a radiant heater design, each of which has four heating resistors and is switched by a known seven-cycle switch, not shown, which is connected to the radiant heater via four connecting lines.
  • the letters a to f for the individual partial figures denote the switching stages from full power (a) to the lowest partial power (f).
  • the design power of each heating resistor in watts is given in the partial figure a and the total power resulting from the circuit next to the figure. This is expressly referred to.
  • the heating units currently in operation the resistances are marked by hatching, whereby the hatching width indicates that they are operated at a lower power by series connection.
  • a dark radiator 25 and three bright radiators 20 are provided in the exemplary embodiment.
  • This arrangement can also be different. With full power (a), all are operated in parallel, while in stages b, c and d only three, two or one light source with its design power is in operation. At stage e, two light sources connected in parallel are connected in series with a light source, while in the lowest position f of this circuit e, the dark source 25 is also connected in series.
  • the advantage here is that at least one light emitter is in operation in all positions and the operator can read the power level from the configuration and light intensity.
  • a conventional seven-stroke switch can be used, as it is commercially available for other hot plates.
  • Figure 6 uses the same seven-stroke switch in the same switching stages, which can also be seen from the connection ends shown filled. The difference is that only two light emitters 20 and two partial resistors 34, 35 are used for the dark emitter 25. In addition, a diode 55 is provided, which is bridged by a switch 56 in the positions a to e.
  • This circuit operates according to FIG. 5 with the difference that none of the light emitters, but only the conventional heating resistor 34, is switched on in the power stage d. Compared to FIG. 6, only one of the light emitters 20 has to be replaced by the resistor 34. In the lowest position f, the switch 56 is opened and the diode 55 halves the power again, so that the lowest level with 93 watts is only about 5 percent of the total installed power and a warming level is thus possible.
  • FIGS. 7 to 9 show 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.
  • an insulating support 24 which consists of a highly heat-resistant and relatively good insulating material
  • a cover 114 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, 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 on the underside of the cooking surface 15 and is usually pressed against it by a spring force acting on the sheet metal shell 12.
  • 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 filaments 83 enclosed in quartz pistons 82, which emit radiation far in the visible range and at temperatures well above 1500 K (approx. 1200 ° C) work. 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.
  • Dark radiator heating elements 25 can be arranged between the bright radiators and in the circular section region formed between them and the edge 22 of the heated region 23 formed inside the radiant heater.
  • These heating coils are arranged essentially spirally in a shape adapted to the shape of the respective dark radiator heating zone 27 and are partially embedded in the material of the insulating support, e.g. according to DE-PS 27 29 929 attached.
  • 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 a targeted reflection of the radiation.
  • the light emitters and dark emitters are switched on in parallel, in series or individually by means of selector switches, power or temperature controls or controls, the light emitters being switched on in particular in the parboiling range or in the higher power range, because there they are most likely to show off 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. 7 to 9 in the edge 22 and is open at the top.
  • the cover panel 81 covers the opening of the edge recess and thus shields it from above so that it is not visible from above.
  • the end section, and in particular the flattened section 84 is covered with a light-absorbing or reflecting layer 89, which in particular also covers the end faces 91 of the section 84.
  • 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 be lowered, which is very desirable because a critical point of halogen spotlights is the temperature at the pinch point through which the connector 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. 10 to 1 2 corresponds to that according to FIGS. 7 to 9 with 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 spotlights.
  • 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 at which the end of the light emitter is surrounded is important, so that heat can be dissipated from there and overheating of the end is prevented.
  • a combination of the two embodiments with the cover 92 and the layer 89 is particularly preferred.
  • the 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 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 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 emitter itself has a reflective layer on it Has the outside or inside of its piston 82. It is also advantageous above all that the arrangement according to the invention involves expensive end bases can be avoided. 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. 11 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.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Resistance Heating (AREA)
EP85111989A 1984-09-22 1985-09-21 Elément chauffant à rayonnement pour appareils de cuisson Expired - Lifetime EP0176063B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85111989T ATE53272T1 (de) 1984-09-22 1985-09-21 Strahlheizkoerper fuer kochgeraete.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3434839 1984-09-22
DE3434839 1984-09-22
DE3503648 1985-02-04
DE3503648A DE3503648C2 (de) 1984-09-22 1985-02-04 Strahlheizkörper für Kochgeräte

Publications (2)

Publication Number Publication Date
EP0176063A1 true EP0176063A1 (fr) 1986-04-02
EP0176063B1 EP0176063B1 (fr) 1990-05-30

Family

ID=25824987

Family Applications (2)

Application Number Title Priority Date Filing Date
EP85111791A Expired EP0176027B1 (fr) 1984-09-22 1985-09-18 Elément chauffant à rayons pour appareils de cuisson
EP85111989A Expired - Lifetime EP0176063B1 (fr) 1984-09-22 1985-09-21 Elément chauffant à rayonnement pour appareils de cuisson

Family Applications Before (1)

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

Country Status (6)

Country Link
US (2) US4700051A (fr)
EP (2) EP0176027B1 (fr)
JP (1) JPH081826B2 (fr)
AU (1) AU584356B2 (fr)
ES (1) ES8701360A1 (fr)
YU (1) YU148385A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2613464A1 (fr) * 1987-03-30 1988-10-07 Philips Nv Unite de cuisson electrique et appareil de cuisson electrique muni d'une telle unite
FR2642602A1 (fr) * 1989-01-30 1990-08-03 Scholtes Ets Eugen Dispositif de commande de puissance pour foyers de chauffage ou analogue
EP0300548B1 (fr) * 1987-07-11 1993-08-25 Bauknecht Hausgeräte GmbH Elément chauffant radiant pour cuisinières

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* Cited by examiner, † Cited by third party
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AT16211U1 (de) * 2018-04-27 2019-03-15 Ahrer Edmund Infrarotstrahler und Infrarotkabine mit Infrarotstrahler
US20210041108A1 (en) * 2019-08-09 2021-02-11 Eidon, Llc Apparatuses for radiant heating

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FR2613464A1 (fr) * 1987-03-30 1988-10-07 Philips Nv Unite de cuisson electrique et appareil de cuisson electrique muni d'une telle unite
EP0300548B1 (fr) * 1987-07-11 1993-08-25 Bauknecht Hausgeräte GmbH Elément chauffant radiant pour cuisinières
FR2642602A1 (fr) * 1989-01-30 1990-08-03 Scholtes Ets Eugen Dispositif de commande de puissance pour foyers de chauffage ou analogue

Also Published As

Publication number Publication date
AU4764185A (en) 1986-03-27
AU584356B2 (en) 1989-05-25
JPS6180788A (ja) 1986-04-24
US4808798A (en) 1989-02-28
JPH081826B2 (ja) 1996-01-10
ES547144A0 (es) 1986-11-16
EP0176027B1 (fr) 1989-02-01
ES8701360A1 (es) 1986-11-16
YU148385A (en) 1988-02-29
EP0176027A1 (fr) 1986-04-02
EP0176063B1 (fr) 1990-05-30
US4700051A (en) 1987-10-13

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