EP3883339A1 - Dispositif chauffant rayonnant pour un dispositif de cuisson et dispositif de cuisson - Google Patents

Dispositif chauffant rayonnant pour un dispositif de cuisson et dispositif de cuisson Download PDF

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Publication number
EP3883339A1
EP3883339A1 EP21161275.9A EP21161275A EP3883339A1 EP 3883339 A1 EP3883339 A1 EP 3883339A1 EP 21161275 A EP21161275 A EP 21161275A EP 3883339 A1 EP3883339 A1 EP 3883339A1
Authority
EP
European Patent Office
Prior art keywords
radiation
heating element
heating device
radiant heating
filter
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
EP21161275.9A
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German (de)
English (en)
Other versions
EP3883339B1 (fr
Inventor
Wolfgang Thimm
David Klein
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
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Publication of EP3883339A1 publication Critical patent/EP3883339A1/fr
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Publication of EP3883339B1 publication Critical patent/EP3883339B1/fr
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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
    • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater

Definitions

  • the invention relates to a radiant heating device for a cooking device and a cooking device with a cover surface and such a radiant heating device.
  • the cooking device is designed in particular as a hob.
  • Radiant heating devices for cooktops as cooktop devices are known, for example, from US Pat EP 590315 A2 .
  • An elongated ribbon-like metallic heating element of the radiant heating device is brought to temperatures of well over 1,000 ° C. by connecting it to the mains voltage, so that it glows or glows with an orange hue.
  • the glow pattern of a pure Planck radiator is primarily determined by its temperature. This temperature is required for the heating function of the radiant heater.
  • the invention is based on the object of creating a radiant heating device mentioned at the beginning and a cooking device mentioned at the beginning with such a radiant heating device, with which problems of the prior art can be solved and in particular it is possible to influence the color or the appearance of such a radiant heating device can.
  • the radiant heating device has at least one heating element, this heating element preferably being elongated or flat.
  • the radiant heating device also has a carrier device for the heating element which carries the heating element or on which the heating element is arranged.
  • a carrier device can, for example, be flat as a type of plate or plate.
  • the radiant heating device has a connection device. This can be designed as known in the prior art.
  • the heating element is coated with a conversion material or provided with a conversion material at least in some areas.
  • This conversion material should be provided at least in an area on the heating element which points in an emission direction of the radiant heating device or which is visible during operation of the radiant heating device or which faces an operator. In the invention, what matters is visibility.
  • the conversion material is designed in such a way that it is temperature-stable at an operating temperature of the radiant heating device. This can range from at least 700 ° C to 2,200 ° C, in particular from at least 800 ° C to 1,400 ° C. The conversion material thus remains stable during the operation of the radiant heating device, in particular also during continuous operation and a service life of several years, and can constantly fulfill its function.
  • the conversion material is designed to be radiation-permeable, so that it converts part of the radiation generated by the heating element during operation, but not necessarily all of the radiation.
  • thermal radiation in the non-visible area can be at least partially transmitted, preferably without being influenced.
  • the conversion material is designed in such a way that it at least partially converts radiation from the heating element during its operation into a higher harmonic harmonic of the radiation, which then results in conversion radiation.
  • This higher harmonic component of the radiation is preferably the second or the third harmonic component.
  • this conversion radiation has a wavelength that is halved compared to the radiation from the heating element or a doubled frequency, and in the case of higher harmonic oscillations a correspondingly multiplied frequency.
  • radiation from the heating element that is in the non-visible range can be converted into visible radiation with a desired color or wavelength, which is the aforementioned conversion radiation.
  • radiation with a desired wavelength can be increased or the proportion of this desired conversion radiation can be increased in order to make the radiant heating device appear or radiate in the desired color.
  • the radiant heating device has a filter above the heating element in the radiation direction, which filter is designed such that it lets through the conversion radiation with a proportion of at least 50%. It advantageously allows a significantly higher proportion of the conversion radiation to pass through, for example at least 70% or at least 90%.
  • the filter allows radiation with a wavelength greater than the wavelength of the conversion radiation and less than 800 nm, preferably radiation in the visible spectral range, only to a maximum of 40%, advantageously even less, preferably 20% or even less . In this way, radiation that is undesired with regard to the color can be filtered out so that it is not visible, which increases the visibility of the desired conversion radiation.
  • the conversion material can generate more radiation with a desired wavelength will.
  • the filter on the other hand, radiation other than this desired conversion radiation can be filtered out, so that the color of the conversion radiation can be shown more clearly or can prevail.
  • the filter lets through radiation with a wavelength greater than 800 nm, in particular greater than 1,000 nm, with a proportion of at least 80%, preferably at least 90% or even more. This makes it possible for this radiation, which is not visible in any case and which generates a large part of the heating effect of the radiant heating device as IR radiation, to continue to be present for a good heating function of the radiant heating device.
  • a notch filter or notch filter can preferably be used for this purpose.
  • Such notch filters or notch filters are optical filters that block a certain range of the spectrum and transmit all other wavelengths. They are therefore preferably narrow or narrowband band-stop filters.
  • Notch filters have dielectric coatings and reflect certain wavelengths of radiation. Their manufacturing processes are known in principle and corresponding filters are commercially available, for example from Auer Lighting.
  • non-linear crystals are advantageously used; alternatively, dielectric layers could be used. Because of their polarizability, borates and phosphates are best suited for this. You need some If there are selection conditions, they must preferably not be symmetrical under inversion, must be chemically and above all thermally stable and should not absorb the original and frequency-increased or doubled or tripled light spectrum too strongly. Therefore, as mentioned at the beginning, they are designed to be radiation-permeable.
  • an advantageous conversion material can be selected from the group consisting of lithium niobate, potassium niobate, beta barium borate, lithium triborate, lithium borate, barium titanate, lithium iodate, potassium hydrogen phosphate and potassium titanyl phosphate. It applies here that the respective crystals of the conversion material must be sufficiently long so that each irradiated photon of a frequency f is converted in the corresponding ratio, for example 2: 1 or 3: 1, into a photon of the correspondingly higher double frequency, i.e. the wavelength of the Radiation is divided accordingly.
  • the at least one heating element of the radiant heating device is completely coated with the conversion material or is completely provided with it.
  • the radiation yield of the converted radiation is maximized.
  • a manufacturing process for the heating element or its coating can be simplified.
  • a layer thickness of a coating on the heating element can advantageously be less than 1 mm.
  • An advantageous layer thickness can be 50 nm to 400 ⁇ m, in particular between 200 nm and 300 ⁇ m. It is possible that several thinner layers are applied one behind the other, the layer thickness of which then adds up.
  • An advantageous process is an ALD process, that is, atomic layer deposition.
  • the radiant heating device or its heating element then appears to radiate in white light.
  • the passage through the hob plate with its own color must be observed, so that the white light can be seen just after or above it and not mainly in front of or below it.
  • the filter allows a maximum of 20% of radiation with a wavelength between 450 nm and 800 nm to pass, particularly advantageously a maximum of 5%.
  • This visible radiation can be reduced so that the conversion radiation, for which this filter effect should not apply, is maximally visible.
  • conversion radiation with a wavelength of less than 450 nm is advantageously generated, preferably the color blue with a wavelength of 420 nm.
  • Such a filter is advantageously based on the principle of an interference filter.
  • the heating element can be provided with such a filter as a kind of coating, which then becomes technically difficult because the filter material must also be able to withstand the very high temperatures of the heating element during operation.
  • a filter in a first embodiment is provided on an intermediate layer which is arranged above the heating element. It can be an independently manageable intermediate layer prefabricated as a structural unit, for example made of quartz glass. It can be arranged under a cover surface of the cooking device, which is formed, for example, by the hob plate in the case of a hob. In an alternative, second embodiment, the filter can be applied as a coating directly to said cover surface, preferably on its underside.
  • Such a coating preferably consists of individual dielectric layers with thicknesses in the range of a quarter of the wavelength of the incident light or the incident radiation.
  • Two dielectric materials with very different refractive indices are used. For example, silicon dioxide and titanium dioxide are suitable for this purpose; other combinations can be found in the prior art.
  • the radiant heating device can have exactly a single elongated heating element. It is advantageously made of a metal alloy with iron, chromium and aluminum. Nickel can also be provided particularly advantageously. Alternative materials for such a heating element are conceivable, including ceramic materials, for example.
  • the heating element can be elongated and band-shaped.
  • a band-shaped heating element can be set up on edge on a flat support device. It can possibly be pressed into the carrier device or fastened therein, in particular with holding members projecting downward at intervals.
  • a cooking device has an aforementioned cover surface and at least one radiant heating device arranged below it.
  • the cover surface runs at a distance of 0.5 cm to 10 cm above the radiant heater. This distance should apply between the underside of the cover surface and an uppermost area or point of the heating element.
  • the filter according to the invention is provided on the cover surface or under the cover surface, whereby a practical construction is possible.
  • Such a cover surface is advantageously made of glass ceramic or quartz glass.
  • a diagram shows the relative sensitivity over the wavelength for light, as it can be perceived by the human eye or how the light is visible to humans.
  • the visible range extends from approx. 380 nm to approx. 750 nm, whereby similar gradients exist for the three colors blue, green and red, but these are shifted to one another.
  • the wavelength of the peak of the visible blue light is around 420 nm, i.e. twice the wavelength is 840 nm and thus outside the visible range in the IR range.
  • a hob 11 In the Fig. 2 the structure of a hob 11 according to the invention is shown as the aforementioned cooking device.
  • the hob 11 has a hob plate 13, advantageously made of reddish-brown glass ceramic, as is often the case.
  • the hob plate 13 has an upper side 14 on which a pot T is set up here, as well as an underside 15.
  • a radiation heater 20 according to the invention is arranged at a distance of a few mm, for example 2 mm to 8 mm, below the hob plate 13 or below the filter layer 17, the distance mainly from a band-shaped heating element 22, which is shown here.
  • the heating element 22 has integrally downwardly projecting holding feet 23 with which it is inserted into a carrier layer 27 in order to be held or carried by the latter.
  • the carrier layer 27 is in turn held in a sheet metal plate 29.
  • This structure corresponds to a conventional structure for such radiant heating devices, see also the Fig. 3 as he said from the opening DE 42 29 375 A1 is known.
  • the metallic heating element 22 which is in the form of a strip according to the prior art, has a full-surface coating 25 with the conversion material according to the invention.
  • Lithium niobate can be used as the conversion material to achieve the desired temperature resistance, alternatively another of the materials mentioned at the beginning. that is suitable.
  • the lithium niobate is applied to the metallic heating element 22, for example by means of the ALD method, advantageously, as explained at the beginning, with several steps in order to be able to achieve a desired overall thickness. For example, twenty layers of lithium niobate can be applied one behind the other, each of which has a layer thickness of approximately 12 ⁇ m.
  • the conversion material acts on all radiation emanating from the heating element 22.
  • the conversion material is designed here in such a way that it converts radiation emanating directly from the heating element 22. Since the conversion material has the aforementioned non-linear optical crystals, light with a wavelength of 840 nm, for example, is allowed to pass through and part of this light or this radiation is transmitted or converted into the second harmonic component. This radiation then has a wavelength of 420 nm and is therefore visible as blue light.
  • the IR light with a wavelength of 840 nm is invisible to the human eye, cf. Fig. 1 .
  • Other wavelengths, at least with a difference of more than 5 nm or more than 10 nm, are not converted by the conversion material; they can pass through the conversion material due to the radiation permeability.
  • the radiation is filtered by the filter layer 17 arranged above the heating element 22 or the radiant heating device 20 and made of the material mentioned at the beginning or with the function mentioned at the beginning.
  • the filter layer 17 is advantageously designed as a bandpass interference filter in order to filter out or not to let through light or radiation with a wavelength greater than 450 nm but less than 800 nm. This is essentially the range of visible light above the wavelength for the color blue. According to the representation of the Fig. 1 For example, radiation with a wavelength of less than 450 nm is predominantly blue or blue light, so that on the one hand the original blue light emitted by the heating element 22 is transmitted upwards, even if its radiation component is low.
  • the converted light with the original wavelength of 840 nm is converted into light with the wavelength 420 nm, and this with a significantly higher proportion than the original, corresponding to the known curves of the Planck radiator mentioned at the beginning.
  • This converted blue light is added to the rest of the blue light that has passed through, so that the radiant heating device 20 or the heating element 22 above the filter layer 17 shines in blue.
  • This blue light then passes through said hob plate 13 and is visible from above. If the reddish-brown color of the hob plate 13 is too discolored, instead of direct generation of blue light by the heating element 22 including the coating 25 made of conversion material, a wavelength of a color should be achieved that, after shining through the hob plate 13, of the desired color , here the color blue, corresponds or comes as close as possible to it.
  • a radiant heating device 20 according to the invention is shown once again in an oblique view. It has an elongated band-shaped heating element 22 which is corrugated and runs in a concentric meander-like laying shape on a carrier layer 27 made of microporous insulating material. Electrical contacting to the heating element 22 is shown here in a simplified manner by means of the electrical connections 33, that is to say takes place in a known manner by means of a rod controller housing 30 from which a rod controller sensor 31 extends over the surface of the carrier layer 27. A circumferential, annular carrier edge 28 rests on the outside of the edge of the carrier layer 27; the whole is arranged in a sheet metal plate 29 for better handling and holding.
  • the hob plate 13 has four hotplates, each of which is formed by radiant heating devices 20a to 20d arranged underneath. These are basically designed similar to those in Fig. 3 , wherein the radiant heating devices 20b and 20d are designed as so-called two-circuit heaters.
  • the radiant heating devices 20a to 20d are arranged on a support plate 19 in order to be pressed from below with the upper side of the respective circumferential support edge 28.
  • a filter plate 18 is provided or shown between the hob plate 13 and the radiant heating devices 20a to 20d.
  • the filter plate 18 is made of thin quartz glass and has on one of its sides, possibly also on both sides, a previously described coating made of material which has the filter properties mentioned and thus the filter layer 17 of the Fig. 2 is equivalent to.
  • Another possibility could be a filter layer similar to the coating 25 with conversion material directly on the heating element 22 or on the coating 25.
  • the temperature requirements for a material for the filter layer are so high that the provision of a separate filter layer is considered more practicable.
  • an attempt can also be made to generate as much blue light as possible in a first step.
  • the emitted spectrum can be influenced in such a way that the Wavelengths in the areas of blue, green and red have approximately the same intensity, advantageously the same or identical as possible.
  • the radiant heating device 20 or the heating element 22 then ultimately appears to radiate in white light.
  • the passage through the hob plate 13 must be observed, so that the white light should be visible just above it and not mainly in front of it or below it.
  • the light with a wavelength of more than 840 nm or 900 nm does not have to be filtered out by a filter, since it is not visible anyway and thus cannot influence a perceptible color for the heating element 22.
  • the radiant heating device 20 is intended to mainly generate a lot of thermal radiation for the heating function, in particular for a pot T.
  • notch filters are optical filters that block a certain area of the spectrum and transmit or allow all other wavelengths to pass through.
  • Such a filter can be obtained from Auer Lighting. These filters also have the necessary temperature stability for use in a radiant heater.
  • a notch filter with a relatively wide filtering is shown in solid lines, which largely filters out or blocks radiation with wavelengths between 570 nm and 670 nm.
  • the dashed line shows a notch filter with relatively narrow filtering, which largely filters out or blocks radiation with wavelengths between 570 nm and 590 nm, that is to say a smaller range.
  • this is the wavelength range of the color red, the color red or its wavelength range is therefore no longer present or hardly present in the radiation or in the light behind it.
  • a combination of several such notch filters one after the other can also filter out or block several wavelength ranges or colors. This means that there can only be a single color behind it.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Baking, Grill, Roasting (AREA)
EP21161275.9A 2020-03-20 2021-03-08 Dispositif chauffant rayonnant pour un dispositif de cuisson et dispositif de cuisson Active EP3883339B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020203631.4A DE102020203631A1 (de) 2020-03-20 2020-03-20 Strahlungsheizeinrichtung für eine Kocheinrichtung und Kocheinrichtung

Publications (2)

Publication Number Publication Date
EP3883339A1 true EP3883339A1 (fr) 2021-09-22
EP3883339B1 EP3883339B1 (fr) 2022-12-14

Family

ID=74859801

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21161275.9A Active EP3883339B1 (fr) 2020-03-20 2021-03-08 Dispositif chauffant rayonnant pour un dispositif de cuisson et dispositif de cuisson

Country Status (4)

Country Link
EP (1) EP3883339B1 (fr)
DE (1) DE102020203631A1 (fr)
ES (1) ES2939957T3 (fr)
PL (1) PL3883339T3 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4229375A1 (de) 1992-09-03 1994-03-10 Ego Elektro Blanc & Fischer Strahlungs-Heizer
US6150636A (en) * 1997-01-10 2000-11-21 E.G.O. Elektro-Geraetebau Gmbh Contact heat-transferring cooking system with an electric hotplate
EP1505354A1 (fr) * 2002-05-16 2005-02-09 Nippon Electric Glass Co., Ltd Plaque de cuisson superieure

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10250317B4 (de) 2002-10-29 2004-10-28 Schott Glas Glas- oder Glaskeramikplatte mit einer elektrischen Heizeinheit
FR2976683B1 (fr) 2011-06-15 2013-11-08 Eurokera Article vitroceramique a affichage lumineux colore.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4229375A1 (de) 1992-09-03 1994-03-10 Ego Elektro Blanc & Fischer Strahlungs-Heizer
EP0590315A2 (fr) 1992-09-03 1994-04-06 E.G.O. Elektro-Geräte Blanc und Fischer GmbH & Co. KG Elément chauffant, en particulier pour appareils de cuisine
US5498853A (en) * 1992-09-03 1996-03-12 E.G.O. Elektro-Gerate Blanc U. Fischer Heater, particularly for kitchen appliances
US6150636A (en) * 1997-01-10 2000-11-21 E.G.O. Elektro-Geraetebau Gmbh Contact heat-transferring cooking system with an electric hotplate
EP1505354A1 (fr) * 2002-05-16 2005-02-09 Nippon Electric Glass Co., Ltd Plaque de cuisson superieure

Also Published As

Publication number Publication date
EP3883339B1 (fr) 2022-12-14
DE102020203631A1 (de) 2021-09-23
PL3883339T3 (pl) 2023-04-11
ES2939957T3 (es) 2023-04-28

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