WO2007012480A1 - Dispositif de cuisson - Google Patents

Dispositif de cuisson Download PDF

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Publication number
WO2007012480A1
WO2007012480A1 PCT/EP2006/007396 EP2006007396W WO2007012480A1 WO 2007012480 A1 WO2007012480 A1 WO 2007012480A1 EP 2006007396 W EP2006007396 W EP 2006007396W WO 2007012480 A1 WO2007012480 A1 WO 2007012480A1
Authority
WO
WIPO (PCT)
Prior art keywords
cooking
reflector
radiation
cooking device
plate
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.)
Ceased
Application number
PCT/EP2006/007396
Other languages
German (de)
English (en)
Inventor
Hans-Joachim Schmidt
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of WO2007012480A1 publication Critical patent/WO2007012480A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/032—Heaters specially adapted for heating by radiation heating

Definitions

  • the invention relates to a cooking device according to the preamble of patent 'tent straps. 1
  • Such a cooking device is known, for example, from EP 0 169 643 A1.
  • These conventional cooking devices consist essentially of a cooking plate made of glass ceramic, which absorbs radiation in the visible wavelength range and arranged below the cooking plate heater with four rod-shaped, parallel halogen lamps. Below the halogen lamps, a cup-shaped, semicircular or semi-elliptical reflector arrangement of infrared radiation-reflecting ceramic material for reflecting the infrared radiation emitted by the halogen lamps is arranged on an underside of the cooking plate.
  • the hotplate is undesirably heated during operation of the halogen lamps, so that it can come after switching off the halogen lamps by the stored in the hotplate residual heat due to a heat transfer from the cooking plate to the cooking vessel, to an undesirable after-heat effect.
  • the invention has for its object to provide a cooking device in which over conventional solutions improved efficiency with minimal device complexity is possible.
  • the cooking device has a cooking plate of glass ceramic and at least one arranged below the cooking plate source of optical radiation.
  • the radiation source is arranged in a reflector which reflects the radiation emitted by the radiation source onto the underside of the cooking plate, the cooking plate having a high transmittance, at least in the spectral region of the emission of the radiation source.
  • the reflector essentially directs the complete radiation emission of the radiation source onto the underside of the radiation source Hotplate reflected and transmitted due to the spectrally aselective transmitting hot plate with high efficiency to the cooking vessel.
  • the free radiation of the radiation source ie the radiation emitted directly from the radiation source to the underside of the cooking plate radiation is also transmitted from the cooking plate to the cooking vessel.
  • the reflector has a substantially rotationally symmetrical shape. It has proven to be advantageous if the reflector is formed approximately paraboloid-shaped. As a result, the reflector has a high optical efficiency, so that the overall efficiency of the cooking device is further improved.
  • the reflector is preferably made of a material with a high aselective reflectance in the spectral range of the radiation source and / or has an aselective reflective coating.
  • the radiation source extends substantially along a longitudinal axis of the reflector.
  • the radiation source is a halogen lamp which is at least partially inserted into a reflector neck of the reflector. Due to the substantially point-shaped radiation source and the high distribution temperature of the halogen lamp, the optical efficiency of the cooking device is further improved significantly.
  • At least one incandescent filament of the halogen lamp is aligned substantially axially within a lamp vessel of the lamp.
  • the inconvenient radiation in the reflector neck is minimized by the incandescent filament aligned axially within the lamp vessel of the lamp, thereby substantially improving the optical efficiency of the lamp system.
  • Due to the low mass of the incandescent filament the thermal inertia is very low compared with the rod-shaped halogen lamps with a large axial length of the incandescent filaments used in the prior art according to EP 0 169 643 A1.
  • no direct reaction of the cooking plate on the filament occurs because the radiation of the cooking plate due to the heating by heat conduction from the cooking vessel at very high wavelengths, which can no longer happen the quartz glass of the lamp vessel.
  • the heating of the cooking material is preferably adjustable via the electrical power supply of the filament. This can save energy for the Cooked food can be varied very quickly, since even a slight change in the coil temperature causes a large change in the radiated power of the cooking device. Due to the low thermal inertia of the filament and the freedom from reaction, a defined control behavior and direct response of the cooking device is achieved similar to the operating behavior of a gas range.
  • the filament of the halogen lamp is arranged in an embodiment of the invention in the region of the focal point of the reflector.
  • the radiation emitted by the incandescent filament onto the reflector is directed directed onto the underside of the cooking vessel, so that the optical efficiency of the arrangement is largely determined by the high degree of reflection (approximately 90 to 99%) of the reflector.
  • the filament during operation of the halogen lamp has a temperature of up to about 3000 K.
  • the proportion of radiation lying above 2700 nm and thus partially absorbed by the cooking plate is reduced so that the cooking plate only heats up slightly during operation of the cooking device. This further reduces the unwanted afterheating effect of the cooking plate.
  • a shielding device for reducing unwanted scattered light is arranged below the cooking plate, which surrounds the outer circumference of the reflector at least in sections on the light exit side.
  • the side of the shield device facing the hotplate has a light-absorbing surface or surface coating.
  • the shielding device absorbs scattered light reflected back into the cooking plate on the cooking vessel and prevents unwanted light radiation from the cooking plate from the side of the cooking vessel.
  • the side facing the cooking plate of the shielding device is preferably reflective in the infrared radiation region and / or provided with a reflective coating in the infrared radiation region. This ensures that the radiation component reflected by the cooking vessel is reflected back in the infrared wavelength range in the direction of the top of the hob and leads to a further heat radiation of the cooking plate.
  • the reflector is thermally conductively connected to the shielding device in an embodiment according to the invention. Due to the heat transfer into the shielding device, the reflector is cooled, thereby further reducing the heat emission of the reflector by heat radiation into the hearth substructure.
  • the reflector and / or the shielding device are preferably thermally insulated from the cooking plate, so that an undesirable heat transfer between see the reflector and / or the shielding device and the hotplate is prevented.
  • the shielding device has in an inventive embodiment, at least one shielding plate, for example, from aluminum sheet having a black anodized coating ⁇ or copper sheet.
  • the reflector and the shielding plate are integrally formed.
  • at least one reflector can be introduced as an embossing in the shielding plate.
  • the reflectance of the shielding plate can be used for the useful radiation or the reflectance in the region of the embossment can be increased, for example, by vapor deposition with silver or by using a reflector insert made of highly reflective material.
  • the shielding device consists only of a coating or other surface treatment on the underside of the cooking plate.
  • the cooking device has at least one sensor arrangement for detecting the cooking vessel on the cooking plate.
  • the sensor arrangement can have, for example, a photocell, light barrier arrangement or an inductance-based sensor.
  • Figure 1 is a schematic representation of a cooking device according to the invention
  • FIG. 3 shows transmission curves of the glass-ceramic cooking plate of the cooking device according to the invention from FIG. 1 and a conventional glass-ceramic cooking plate when exposed to the radiation spectrum of a halogen lamp at an operating temperature of the incandescent filament of 2860 K.
  • Figure 1 shows a schematic representation of a cooking device 1 according to the invention with a hotplate 2 made of glass ceramic and one below the
  • the radiation source 4 is arranged in a reflector 6, which reflects the radiation emitted by the radiation source 4 radiation on a cooking surface 8 underside of the cooking plate 2, wherein the cooking plate 2 at least in the spectral region of the emission of the radiation source 4 has a high transmittance
  • the reflector 6 is formed in the embodiment shown as a rotation paraboloid made of aluminum with a high aselective reflectance.
  • the radiation emission of the radiation source 4 is directed to the underside 8 of the cooking plate 2 is reflected and transmitted due to the spectrally aselective transmitting hot plate 2 with high efficiency to a bottom 10 of a cooking dotted line 12 indicated by dash-dotted line.
  • additional heat protection devices below the cooking plate 2 can be dispensed with compared to the prior art according to EP 0 169 643 A1, so that the production of the cooking device 1 is considerably simplified.
  • the free radiation of the radiation source 4, ie the radiation emitted directly from the radiation source 4 to the cooking surface bottom 8 of the cooking plate 2 radiation is also transmitted from the cooking plate 2 to the cooking vessel bottom 10.
  • the bottom 10 of the cooking vessel 12 absorbs the radiation emitted by the radiation source so that cooking material (not shown) arranged in the cooking vessel 12 is heated. Due to the substantially direct heating of the cooking vessel 12 by the radiation emitted by the radiation source 4, the cooking process takes place substantially inertia-free and with high efficiency.
  • the outer diameter D of the cooking vessel 12 used is selected as a function of the diameter d of the light exit opening of the reflector 6 and is preferably slightly larger than the diameter d of the light exit opening to avoid stray light.
  • a halogen incandescent lamp of conventional construction is used as the radiation source 4.
  • a halogen incandescent lamp 4 essentially has a lamp base 14 in the form of a pinch seal and a substantially ellipsoidal lamp vessel 16 made of quartz glass that is rotationally symmetrical about a lamp axis AA and can be provided with dopants absorbing ultraviolet radiation.
  • an incandescent filament 20 is arranged, which is supplied by means of two led out of the pinch seal of the lamp vessel 16 power supply lines 22, 24 with electrical energy.
  • the interior 18 is substantially filled with a halogen containing filler gas.
  • the lamp vessel 16 is sealed by means of a pump tube sealed off to a dome 26.
  • the halogen lamp 4 is inserted over the lamp base 14 in a reflector neck 28 of the reflector 6.
  • the incandescent filament 20 is aligned axially within the lamp vessel 16 of the halogen lamp 4, so that the unwanted radiation in the reflector neck 28 is minimized relative to a horizontal arrangement of the incandescent filament 20, and the optical efficiency of the cooking apparatus 1 is further improved.
  • the incandescent filament 20 of the halogen lamp 4 is arranged in the region of the focal point of the reflector 6.
  • substantially all the radiation emitted by the incandescent filament 20 onto the reflector 6 is directed by the cooking plate 2 onto the bottom 10 of the cooking vessel 12, so that the optical efficiency of the arrangement is largely dependent on the high reflectance (up to 99%) of the reflector 6 is determined.
  • the filament 20 is heated to a temperature of up to 3000K.
  • the proportion of the more than 2700 nm lying and thus partially absorbed by the cooking plate 2 Radiation reduced (see Figure 2), so that the hot plate 2 heats only slightly during operation of the cooking device 1.
  • the thermal inertia is very low compared with the rod-shaped halogen lamps with a large axial length of the incandescent filament used in the prior art according to EP 0 169 643 A1. Furthermore, there is no direct reaction of the cooking plate 2 on the filament 20, because the radiation of the cooking plate 2, for example due to heating by conduction through the cooking vessel 12, runs at very high wavelengths that can no longer happen the quartz glass of the lamp vessel 16.
  • the heating of the cooking material is gradually or continuously adjustable via the electrical power supply of the filament 20. Since even a small change in the coil temperature causes a large change in the radiated power of the cooking device 1, the power supply for the food can be varied very quickly and sensitively. Due to the low thermal inertia of the incandescent filament 20 and the freedom from reaction, a defined control behavior and direct response of the cooking device 1 according to the invention similar to the operating behavior of a gas range is achieved.
  • a shielding device 30 with a shielding plate 32 made of aluminum is arranged below the cooking plate 2, which surrounds the outer circumference of the reflector 6 on the light exit side axially spaced.
  • the shielding device 30 is reflected on the cooking vessel bottom 10 back into the cooking plate 2 reflected scattered light and reduces unwanted light emission of the cooking plate 2.
  • the side of the shielding plate 32 facing the cooking plate 2 is provided with black anodization coating 34 which absorbs radiation in the visible wavelength range and reflects radiation in the infrared radiation range.
  • the shielding plate 32 may be made of copper or have a light-absorbing surface structure or light-scattering recesses, such as perforations.
  • the reflector 6 is thermally conductively connected via holding elements, not shown, or a connecting mass with the shielding device 30 and is cooled by the heat transfer into the shielding device 30, so that the heat emission is reduced in the hearth base.
  • the shielding device 30 and the reflector 6 are connected via holding elements, not shown, or a connecting compound, such as silicone, thermally insulated with the cooking plate 2. Thereby, the unwanted heat transfer between the reflector 6 and the cooking plate 2 and the shielding device 30 and the cooking plate 2 is reduced, so that the heat emission is further reduced in the hearth base.
  • a connecting compound such as silicone
  • the reflector 6 and the shielding plate 32 are integrally formed and the reflector 6 is introduced as an embossing in the shielding plate 32.
  • the reflectance of the shielding plate 32 can be used for the useful radiation or the reflectance in the region of the embossment can be increased, for example, by vapor deposition with silver or by using a reflector insert made of highly reflective material.
  • the shielding device 30 consists only of a coating or other surface treatment on the bottom 8 of the cooking plate. 2
  • the cooking device 1 has a sensor arrangement (not shown) for detecting the cooking vessel 12 on the cooking plate 2.
  • the sensor arrangement may have, for example, a photocell, light barrier arrangement or an inductance-based sensor.
  • the cooking device 1 is further associated with a temperature sensor, not shown, which reduces the power of the halogen lamp 4 when it reaches a defined maximum temperature or switches off, thereby forming an overload protection for the cooking device 1.
  • the transmission behavior of the cooking plate 2 (see FIG. 1) of the cooking device 1 according to the invention is represented by a curve 38 and the transmission behavior of a conventional CERAN® hotplate by a curve 40 indicated by dash-dotted lines.
  • the glass-ceramic material of the cooking plate 2 of the cooking device 1 according to the invention is such that it has a high transmittance in the visible and infrared wavelength range of approximately 400 to 2700 nm.
  • Such a cooking plate 2 made of transparent glass ceramic is available, for example, under the name ROBAX® from Schott Glas.
  • ROBAX® transmits about 80% of the radiation emitted by the halogen lamp 4 (see FIG. 1) in the range from 400 to 600 nm.
  • these radiation components are absorbed by the conventional CERAN® hotplate.
  • the ROBAX® hotplate 2 has about twice the transmission of the conventional CERAN® hotplate. In the range from 1300 to 2400 nm, the transmission of the ROBAX® hotplate 2 is about 10% higher than the transmittance of the CERAN® hotplate. Due to the low radiation absorption of the cooking plate 2 of the cooking device 1 according to the invention compared to the conventional CERAN® hotplate, the residual heat released by the latter after switching off the halogen lamp 4 is substantially reduced, so that a sensitive control of the heating power with improved optical efficiency of the cooking device 1 is enabled.
  • FIG. 3 shows a wavelength range of approximately 400 to 1650 nm
  • the transmission behavior of the cooking plate 2 of the cooking device 1 according to the invention is represented by a curve 44 and the transmission behavior of the conventional CERAN® hotplate through a curve 46.
  • the optical efficiency of the cooking device 1 is further determined by the reflectance of the reflector 6 in the inventive arrangement.
  • the inventive cooking device 1 is not limited to the described halogen lamp 4, but any known from the prior art lamp type can be used, which forms a substantially punctiform radiation source 4 with sufficiently high radiation in the transmission region of the cooking plate 2. Furthermore, as the cooking plate 2, any known from the prior art glass-ceramic material can be used, which has a high aselective transmissivity. It is essential to the invention that the radiation source 4 is arranged in a reflector 6 which reflects the radiation emitted by the radiation source 4 onto the underside 8 of the cooking plate 2, the cooking plate 2 having a high transmittance at least in the spectral range of the emission of the radiation sources 4.
  • the cooking device 1 according to the invention is characterized by a high efficiency and can be used due to the small footprint, for example in countertops of kitchen equipment.
  • a cooking device 1 with a cooking plate 2 made of glass ceramic and at least one arranged below the cooking plate 2 radiation source 4.
  • the radiation source 4 is arranged in a reflector 6 which reflects the radiation emitted by the radiation source 4 radiation on the underside 8 of the cooking plate 2, wherein the cooking plate 2, at least in the spectral range of the emission of the radiation source 4 has a high transmittance.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)

Abstract

L'invention concerne un dispositif de cuisson comprenant une plaque de cuisson (2) en vitrocéramique, et au moins une source de rayonnement (4) qui est disposée en dessous de cette plaque de cuisson (2). Selon l'invention, la source de rayonnement est placée dans un réflecteur (6) qui réfléchit le rayonnement émis par ladite source de rayonnement sur la face inférieure de la plaque de cuisson, cette plaque de cuisson présentant un facteur de transmission élevé au moins dans le domaine spectral d'émission de la source de rayonnement.
PCT/EP2006/007396 2005-07-28 2006-07-26 Dispositif de cuisson Ceased WO2007012480A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200520011888 DE202005011888U1 (de) 2005-07-28 2005-07-28 Kochvorrichtung
DE202005011888.5 2005-07-28

Publications (1)

Publication Number Publication Date
WO2007012480A1 true WO2007012480A1 (fr) 2007-02-01

Family

ID=35140512

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/007396 Ceased WO2007012480A1 (fr) 2005-07-28 2006-07-26 Dispositif de cuisson

Country Status (2)

Country Link
DE (1) DE202005011888U1 (fr)
WO (1) WO2007012480A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008036753A1 (fr) * 2006-09-19 2008-03-27 Thermodyne Foodservice Products, Inc. Réchauffeur à chauffage par rayonnement

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3330939A (en) * 1965-09-22 1967-07-11 Gen Motors Corp Electric hot plate
US3375346A (en) * 1965-09-22 1968-03-26 Gen Motors Corp Infrared surface heating unit with two filaments
US3401256A (en) * 1965-09-22 1968-09-10 Gen Motors Corp Invertible infrared surface heating unit
US3407285A (en) * 1965-10-23 1968-10-22 Gen Motors Corp Domestic range with variable area cooking regions
EP0169643A1 (fr) * 1984-06-28 1986-01-29 THORN EMI Patents Limited Appareil de chauffage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3330939A (en) * 1965-09-22 1967-07-11 Gen Motors Corp Electric hot plate
US3375346A (en) * 1965-09-22 1968-03-26 Gen Motors Corp Infrared surface heating unit with two filaments
US3401256A (en) * 1965-09-22 1968-09-10 Gen Motors Corp Invertible infrared surface heating unit
US3407285A (en) * 1965-10-23 1968-10-22 Gen Motors Corp Domestic range with variable area cooking regions
EP0169643A1 (fr) * 1984-06-28 1986-01-29 THORN EMI Patents Limited Appareil de chauffage

Also Published As

Publication number Publication date
DE202005011888U1 (de) 2005-10-06

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