EP3337291B1 - Dispositif de chauffage, appareil de cuisson doté d'un dispositif de chauffage et procédé de fabrication d'un élément chauffant - Google Patents

Dispositif de chauffage, appareil de cuisson doté d'un dispositif de chauffage et procédé de fabrication d'un élément chauffant Download PDF

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Publication number
EP3337291B1
EP3337291B1 EP17207786.9A EP17207786A EP3337291B1 EP 3337291 B1 EP3337291 B1 EP 3337291B1 EP 17207786 A EP17207786 A EP 17207786A EP 3337291 B1 EP3337291 B1 EP 3337291B1
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EP
European Patent Office
Prior art keywords
heating element
heating
cooking appliance
appliance according
holding device
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.)
Active
Application number
EP17207786.9A
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German (de)
English (en)
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EP3337291A1 (fr
Inventor
Wolfgang Wittenhagen
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
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EGO Elektro Geratebau GmbH
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Publication of EP3337291A1 publication Critical patent/EP3337291A1/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
    • 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
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/102—Tops, e.g. hot plates; Rings electrically heated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/06—Arrangement or mounting of electric heating elements
    • F24C7/062—Arrangement or mounting of electric heating elements on stoves
    • F24C7/065—Arrangement or mounting of electric heating elements on stoves with reflectors
    • 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
    • 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
    • H05B3/688—Fabrication of the plates
    • 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
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0258—For cooking
    • H05B1/0261—For cooking of food
    • H05B1/0266—Cooktops
    • 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
    • H05B2203/002—Heaters using a particular layout for the resistive material or resistive 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
    • H05B2203/007—Heaters using a particular layout for the resistive material or resistive elements using multiple electrically connected resistive elements or resistive zones
    • 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
    • H05B2203/014—Heaters using resistive wires or cables not provided for in H05B3/54
    • H05B2203/015—Heater wherein the heating element is interwoven with the textile

Definitions

  • the invention relates to a cooking appliance with a heating device with a flat heating element and a holding device for this heating element.
  • Such a heating device and a hob provided with it are known, a heating element for this purpose being separated from metal foil with a geometric pattern. In this way, a certain heating conductor length can be achieved by individual heating conductors. Furthermore, a large radiating surface of the heating element can be achieved upwards towards a hob plate and an erected cooking vessel.
  • the JP S40 26128 Y1 shows a heating device with a grid in which parallel heating wires are incorporated.
  • the heating wires run between two opposing holding clamping rails into which they are clamped together with the grid. This is also used to make electrical contact.
  • the heating device is used in a toaster.
  • heaters are known as hot plates for contact cooking.
  • An oval-ring-shaped heating element is placed on the underside of a mounting surface and is held by a holder. This heating element is designed as a type of grid or fabric.
  • a hot plate is known as a heater.
  • a heating element in the form of a resistance wire which has been processed into a fabric together with non-metallic threads, is pressed into a plastic and electrically insulating material to form a plate.
  • this fabric or the heating element itself is held by complete embedding.
  • the invention is based on the object of creating a cooking appliance mentioned at the beginning with which problems of the prior art can be solved and in particular it is possible to reliably and inexpensively manufacture and install heating elements for advantageously usable heating devices in cooking appliances.
  • the heating device has a flat heating element and a holding device for the heating element.
  • the heating element is held on the holding device along an outer edge or its outer edge. At least 70% of its area runs freely between the holding device or within the holding device, advantageously at least 85%. This means that holding devices or other holding means do not attack or support this area portion either on an upper side or on a lower side of the heating element. This enables the heating power of the heating element to be radiated very well over a large area.
  • the heating element is a grid or a fabric that consists at least partially of heating conductor material or has heating conductor material.
  • a grid or fabric can advantageously consist of thin heating element sections, for example of wires or threads, with intermediate surfaces or free surfaces in between.
  • the heating element sections in turn can either themselves consist of heating conductor material or be at least partially coated with such material, for example only on one side pointing in one direction. Alternatively, they can also be coated or sheathed all around or completely with heat conductor material.
  • such a heating element can have a plurality of intermediate surfaces between the heating element sections mentioned or between the wires or threads.
  • the intermediate surfaces can advantageously have a larger surface area of the entire heating element than its heating element sections or wires.
  • a grid can also be punched or etched out of a flat material, so that a grid shape remains, so to speak.
  • the total area of the intermediate surfaces can be larger than the total area of the wires or threads. It is advantageously 35% to 90% of the total area of the heating element, particularly advantageously 60% to 80%.
  • the intermediate areas can be relatively small. Then the total area of the intermediate surfaces or the free areas is smaller than the total area of the wires or threads. It is advantageously 5% to 40% of the total area of the heating element, particularly advantageously 10% to 30%.
  • the heating element is held at least at several holding points of the holding device.
  • Such breakpoints can be advantageous along a Stop lines run, in particular the stop points are provided continuously as a stop line or several stop lines.
  • a flat reflector is provided for the heating element in a direction away from a heating direction of the heating element, for example in the direction of a hob plate of a hob, advantageously on a bottom side of the heating device.
  • a reflector can particularly advantageously be held on the holding device under the heating element. It can be made of metal, for example as a polished metal surface or the like, in order to reflect the downwardly radiated heating energy as well as possible upwards in the heating direction or in the direction of an aforementioned hob plate.
  • the reflector can be flat, curved or structured.
  • the holding device is designed to be circumferential or closed.
  • This can be a type of ring, advantageously with the aforementioned holding line or the set of holding points for the heating element thereon, which correspond to its outer contour.
  • the shape of the heating device can in principle be of any desired shape, for example also round. However, it is advantageous that it is rectangular or at least in the form of a parallelogram. As a result, a largely constant current flow and thus a largely, advantageously completely, uniform power density can be achieved within the flat heating element. For example, a current can flow from one side of the parallelogram to the opposite side.
  • the holding device advantageously limits a lateral or lateral expansion of the heating device.
  • the heating element is arranged within it and extends there in terms of area, advantageously closed. This means that the heating element runs only within the holding device.
  • the holding device can advantageously also form thermal insulation at the same time, as is the case with radiant heating devices and those mentioned at the outset DE 19638640 A1 is known.
  • connection contacts can be designed as contact strips, for example as thin metal strips.
  • the contact strips can be attached to outer edges and thereby also provide electrical contact the heat conductor material. They can be folded around the outer edges for fastening and thus enclose the outer edges between them or be welded with edge strips along the outer sides, advantageously both.
  • a central holder is provided in a central area of the heating device or the heating element, in particular at a center point, for holding in this central area. In this way, excessive sagging of a heating element that is not inherently stable can be prevented in the central area.
  • a linear holder can also be provided on such a central holder. In the case of a rectangular or parallelogram-shaped heating element, in particular, this runs along a center line so that the flat heating element is held or supported uniformly.
  • Such a central holder can be connected to the rest of the holding device, for example to its lower end. A kind of common base can thus be provided.
  • mechanical stabilization of the heating element can be achieved in that the heating element is structured or deformed three-dimensionally perpendicular or perpendicular and parallel to the opposite outer edges or contact strips.
  • the heating element can, for example, have a corrugated, sinusoidal or sawtooth-shaped structure. Alternatively, it can have trench-shaped or crater-shaped stabilizing impressions that are not directed or have no orientation as mentioned above. Corresponding measures to stabilize free areas are of sheets or the like. known.
  • the holding device particularly advantageously also a central holder as described above, is arranged on a thermal insulation base.
  • a structure similar to that mentioned above can be used DE 19638640 A1 or another conventional radiant heater in which a strip-shaped elongated heating element is partially inserted directly into such a thermal insulation underlay.
  • the heating element has the aforementioned form of a grid or a fabric, it can advantageously consist of elongated heating element sections which cross or are brought together in different directions.
  • a fabric consists in the usual way of warp threads and weft threads.
  • only one of the two types of threads is advantageously electrically conductive for the heating element function or has heating conductor material or consists of heating conductor material.
  • the other thread then consists of an electrical one insulating material and can above all have a mechanical supportive effect. Ceramic fibers, basalt fibers or carbon fibers are suitable for this.
  • Such wires could also consist of a suitable metal, at least for the heating element function, and be electrically conductive and also fulfill the heating element function.
  • Metal alloys made of, for example, nickel and chromium or iron, chromium and aluminum are suitable here.
  • wires in one direction could also be combined with threads in the other direction.
  • the wires can again advantageously consist of heating conductor material or have such a material for the heating element function.
  • a heating element can have the shape of a grid and have grid sections that run essentially at right angles.
  • Such a grid can consist, as it were, of intersecting heating element sections, which are, however, made in one piece, for example by punching out of a corresponding film or a thin heating conductor material. Such a heating element can then be produced in one piece and in one piece.
  • the heating element can advantageously have heating element sections and perforations running between them as intermediate surfaces.
  • the proportion of the area of the openings or intermediate surfaces is advantageously greater than the proportion of the area of the heating element sections, particularly advantageously by a factor of 2 to 20, in particular by a factor of 5 to 10. If a heating element consists of the aforementioned fabric, a significantly lower factor is advantageous the area proportion of the intermediate surfaces can be smaller than the area proportion of the heating element sections.
  • the heating element advantageously on electrically conductive heating element sections, can be at least partially coated with a catalytically active material.
  • the entire heating element or some heating element sections or some of the individual threads or wires can indeed also consist entirely of such a catalytically active material.
  • this is of no use in terms of effectiveness, since a catalyst acts on its surface, and it would probably be very cost-intensive in view of the often very expensive materials. It is possible that not all parallel and adjacent heating element sections or threads or wires are coated with or have such a catalytically active material, but only, for example, every second, every third or every fourth.
  • Such a catalytic effect directly on the heating element can be advantageous applications of a heating device according to the invention especially where the heating element heats air directly and not only serves as a radiant heater. In this way, air flowing past can be cleaned.
  • a cooking device is a hob with a hob plate.
  • At least one previously described heating device advantageously several, is arranged under the hob plate.
  • a heating device can in principle be used and also operated like a radiant heating device known per se.
  • the hob plate should be as permeable as possible to thermal radiation, for example also consist of glass ceramic, as is generally customary.
  • the holding device presses the heating element as flat as possible onto the underside of the hob plate, which is electrically insulating and can also consist of glass ceramic, for example.
  • the heating device or the heating element works as a contact heater and is operated with low voltage, i.e. 50 V AC or 120 V DC.
  • the heating element is operated in a temperature range of a few 100 ° C., advantageously 200 ° C. to 500 ° C., but below the more than 1,000 ° C. at which radiant heaters usually work.
  • a method for producing a heating element provides that a grid or fabric is produced, as has been described above. It has heating element sections and a heating element function and is flat. It can be woven as a fabric with appropriate warp threads and weft threads or warp wires and weft wires. Such a material can either already be produced in strip form with a width that is subsequently also desired for the heating element or the heating device. Alternatively can it can be made as a larger area and a strip cut out of it. As an alternative to such a production, a corresponding grid of a heating element can be punched out, etched out or lasered out of heating conductor material.
  • a contact strip made of electrically conductive strip material is attached to a strip of the desired width of the heating element in a continuous process on its two opposite outer edges.
  • the outer edges of the strip of the heating element can be folded into these contact strips.
  • electrically conductive strip material can be, for example, a thin sheet of electrically conductive material.
  • the contact strips are mechanically and electrically connected to the strip from the grid or the fabric as a composite.
  • This is advantageously done by welding.
  • This connection is particularly advantageously carried out in a continuous process, wherein both the said strip of the heating element and the strip material for the contact strips can be present in great lengths and, for example, on drums or the like. can be wound, from which it is then unwound.
  • Such contact strips not only serve for uniform and reliable electrical contact, but can also provide a certain mechanical strength. This does not necessarily replace the holding device mentioned at the beginning, even if this would be possible. This also facilitates handling of the heating element when assembling a heating device.
  • a heating element is then cut to length from the elongated strips as a composite. This heating element is then built into a heating device in the manner described above.
  • solid or stranded electrical connection lines are attached to one contact strip in each case. This is advantageously done by welding. Plug contacts can possibly also be attached directly or welded on, in particular plug contact lugs. In this way, electrical connection cables can be easily attached.
  • a fabric 10 which consists of warp threads and weft threads 14, is shown in high magnification. Both threads are not designed to run completely straight here, which results in good structural cohesion of the fabric 10.
  • the warp threads 13 consist of heating conductor material, for example of alloys with nickel and chromium or with iron, chromium and aluminum mentioned at the beginning.
  • the warp threads 13 are advantageously designed as fine wires.
  • the weft threads 14 can in principle also have a heating element function, but they are advantageously electrically insulating and, above all, provided for the support or mechanical strength of the fabric 10. They consist of electrically insulating and correspondingly mechanically strong and above all temperature-resistant material; ceramic fibers, basalt fibers, carbon fibers or aramid fibers are advantageous depending on the maximum temperature and the area of application of a heating element. Multifilaments are particularly advantageous here.
  • a thickness or a diameter of the warp threads and / or the weft threads can be dimensioned according to the application, for example between 0.05 mm and 1 mm, advantageously between 0.1 mm and 0.5 mm.
  • the Fig. 2 shows an example of a possible configuration of a heating device 20 with a finished heating element 11 in which a fabric 10 is processed, as will be explained below.
  • the flat heating element 11 is arranged on an externally extending, preferably rectangular retaining edge, advantageously clamped or inserted into slots and held therein.
  • the retaining edge 21, as well as a central bracket 23 in the middle for the heating element 11, consist of a suitably temperature-resistant and highly insulating material, for example pressed vermiculite or similar material, as is commonly used for radiant heating devices in hobs.
  • the retaining edge 21 and the central holder 23 stand on an insulating pad 24, which consists of the same material. Under certain circumstances, the parts can even be manufactured at least partially in one piece.
  • a reflector 26, which can also be held by the central holder 23 and the holding edge 21, runs below the heating element 11. It can run flat or be slightly curved in each case by means of a sag in order to possibly achieve a better reflection effect.
  • the heating device 20 is installed as a heater in a hob 30 according to the invention, as in FIG Fig. 2 is shown.
  • the hob 30 has a hob plate 32, under or on the underside of which the heating device 20 is arranged in a pressed manner.
  • the heat generated by the heating device 20 or the heating element 11 is radiated upwards through the hob plate 32 into a pot placed thereon.
  • this essentially corresponds to an analogous replacement of a radiant heating device mentioned above, for example, and therefore does not need to be explained in more detail.
  • a finished heating element 11 is produced.
  • the tissue 10 is cut or is present in elongated strips and is inserted into the device 34.
  • the electrically insulating weft threads run in the direction of passage and the warp threads with the heating element function in a direction transverse to it.
  • Partially folded contact strips 15a and 15b are then possibly brought up to the outer sides and folded onto one another by folding means (not shown), the side edges of the fabric 10 being folded into the folded contact strips 15a and 15b.
  • the overlap here can be between 2 mm and 20 mm, advantageously 5 mm to 15 mm.
  • a roll seam welding device 17a is provided on the left and a roll seam welding device 17b is provided on the right. These weld the fabric 10 or the warp threads 13 made of metal to the contact strips 15a and 15b, and under certain circumstances they can also take over the folding. The welding creates a secure and stabilizing mechanical connection on the one hand, and an electrical connection on the other.
  • the finished desired heating elements 11 are then cut to the appropriate length by means of a cutting device 18.
  • the warp threads with the heating element function run from one contact strip 15a to the other contact strip 15b.
  • electrical connections 27 can be attached to the contact strips 15a and 15b, for example as short connecting wires. For this they can be welded on. Alternatively, fixed contact plugs could be attached or welded as contact shoes or flat tabs.
  • the heating element 11 according to FIG Fig. 3 has a rectangular shape, for example a square shape.
  • a form of a parallelogram would also be possible, but practical applications for this are rather rare.
  • the Fig. 4 shows an example of a further possible embodiment of a heating element 11 'similar to that which is shown at the end of the method according to FIG. Fig. 3 is obtained.
  • a corrugated or trench-like structure is introduced into the heating element 11 'or into the fabric 10' made of warp threads 13 'and weft threads 14' and, above all, in the lateral contact strips 15a 'and 15b'. This serves to stabilize the heating element 11 'as a whole, and in particular the tissue 10'.
  • Inclined or longitudinal trenches or similar structures could also be introduced, for example also crossed structures in the manner of a known diamond pattern.
  • trenches 10 there could be more and more closely arranged trenches, so that the aforementioned corrugated structure is created.
  • the trenches 10 'could also be modified in such a way that they are shaped to a point or curved, as it were, as a type of the aforementioned sawtooth.
  • the structures could be introduced in both directions, for example alternately.
  • individual smaller areas could be impressed in a distributed manner, for example as craters or elevations.
  • FIG. 5 an embodiment of a further heating element 111 is shown in plan view, which is designed as a grid or is grid-like.
  • a centrally arranged lattice structure 110 replaces, so to speak, the fabric 10 of Fig. 1 and 3 .
  • a strip of a corresponding width is folded in between two contact strips 115a and 115b, welded and thus mechanically and electrically connected to it.
  • the grid 110 has been produced here by etching from a thin film of a heat conductor material. Alternatively, it could be punched or lasered.
  • the current flow is from one contact strip 115a to the other contact strip 115b.
  • the pattern of the structure in the direction of the longitudinal direction of the contact strips 115 is advantageously regular, which can be particularly advantageous in general for a heating element according to the invention.
  • a further embodiment of a heating element 211 is shown. This is also designed like a grid, but with a different grid than according to FIG Fig. 5 . Elongated heating element sections are designed in the manner of waves that are connected to one another by webs. Such a grating 210 is advantageously produced as before for the grating 110 of FIG Fig. 5 described. Furthermore, this grid 210 is also folded into two contact strips 215a and 215b in the manner described for the mechanical and electrical connection.
  • Fig. 7 is a modification of the representation of the Fig. 2 shown with a heater 320 that is permanently tensioned in a special way.
  • an electrical connection 327 runs down from the left edge of the heating element 311, which also provides a fastening, possibly in addition to a holder on the retaining edge 321.
  • an electrical connection 327 also extends down.
  • a tension weight 329 which is the right connection, is symbolically arranged on this, so to speak 327 pulls down, so to speak.
  • a spring 328 arranged to the left of the connection 327 also generates a certain mechanical tension as a pull, which pulls the heating element 311 as smoothly as possible.
  • a shape of the heating element 311 that is as flat and planar as possible can thus be achieved.
  • an oven 36 with an oven muffle 37 and an oven door 38 which does not belong to the invention, is shown as a further exemplary cooking appliance in addition to a hob.
  • a heating element 11 is provided, for example, in one piece as a bottom heating element below the oven muffle 37, specifically below a glass ceramic plate 39, which in turn is particularly permeable to thermal radiation as in the case of the hob 30 of the Fig. 2 .
  • the exact holding device for the heating element 11 is not shown here, but can, for example, according to FIG Fig. 1 or 7th be. It can also be seen that this lower heating element 11 can be relatively large.
  • the upper heating element is provided in the upper area of the oven muffle 37 or below a muffle ceiling, for example through the combination of two narrow heating elements 11.
  • Both the heating element for the upper heat and that for the lower heat can be made in one piece or consist of an arrangement of rectangular heating elements that have the same or different side and length dimensions. It is thus possible to set both the top heat and the bottom heat partially differently for even heating or browning of the food to be cooked, roasted or grilled.
  • FIG. 9 is off for the oven 36 Fig. 8
  • a hot air function is shown separately just for the sake of clarity.
  • a fan 41 provided for this purpose is arranged in the rear area of the oven muffle 37.
  • a heating element 11 is arranged in the air path, advantageously for thermal reasons behind the fan, which heats the air blown or conveyed through it for the hot air function of the oven 36.
  • the heating element 11 can be at least partially coated here with a catalytically active material, advantageously be completely coated. In this way, a new type of directly heated catalyst heating element can be created for an oven, as a result of which, for example, the circulating air in such an oven 36 can be cleaned in order to reduce contamination and unpleasant odors.
  • a holding device for the heating element 11 is not shown in detail, but it is easy to imagine.
  • the two contact strips 15 on the sides are again particularly suitable for attaching the heating element 11.

Claims (10)

  1. Appareil de cuisson, agencé sous forme de table de cuisson (30, 330) avec une plaque de table de cuisson (32, 331) électriquement isolante, dans lequel au-dessous de la plaque de table de cuisson au moins un dispositif de chauffage (20, 320) est arrangé, dans lequel le dispositif de chauffage comporte un élément chauffant (11, 311) plat et un dispositif de retenue (21, 23, 321) pour l'élément chauffant,
    caractérisé en ce que
    l'élément chauffant est retenu le long d'un bord extérieur sur le dispositif de retenue et s'étend librement à l'intérieur du dispositif de retenue par au moins 70 % de sa superficie, dans lequel le dispositif de retenue (21, 23, 321) serre l'élément chauffant (11, 311) à plat contre la face inférieure de la plaque de table de cuisson (32, 331), dans lequel l'élément chauffant comporte une grille ou un tissu (10) comprenant au moins partiellement matériau de conducteur chauffant, et dans lequel, pendant le fonctionnement, une tension alternative de 50 V ou une tension continue de 120 V est appliquée au dispositif de chauffage (20, 320) en tant que basse tension.
  2. Appareil de cuisson selon la revendication 1, caractérisé en ce que l'élément chauffant (11, 311) est retenu au moins sur points de retenue du dispositif de retenue (21, 23, 321), de préférence sur points de retenue le long d'une ligne de retenue.
  3. Appareil de cuisson selon la revendication 1 ou 2, caractérisé en ce que l'élément chauffant (11, 311) est de structure tridimensionnelle ou est déformé pour stabilisation mécanique, de préférence perpendiculairement ou perpendiculairement et parallèlement à des rebords extérieurs opposés, dans lequel en particulier l'élément chauffant présente une structure ondulée, sinusoïdale ou en forme de dent de scie, ou présente empreintes (16') stabilisantes de forme de tranchée ou de cratère, dans lequel de préférence les empreintes ne sont pas dirigées ou ne présentent pas d'orientation.
  4. Appareil de cuisson selon l'une quelconque des revendications précédentes, caractérisé en ce que dans une direction s'écartant d'une direction de chauffage de l'élément chauffant (11, 311) un réflecteur (26) plat est prévue, le réflecteur est de préférence retenu sur le dispositif de retenue (21, 23, 321) au-dessous de l'élément chauffant, dans lequel en particulier le réflecteur est métallique.
  5. Appareil de cuisson selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un dispositif de retenue (21, 321) est sous forme annulaire périphérique, en particulier fermé, de préférence rectangulaire, et essentiellement limite une extension latérale du dispositif de chauffage (20, 320), dans lequel l'élément chauffant (11, 311) est disposé et s'étend à l'intérieur dudit dispositif.
  6. Appareil de cuisson selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un élément chauffant (11, 311) présente, regardé à partir de la direction de chauffage, une forme rectangulaire avec deux contacts de raccordement (15a, 15b) sur des côtés extérieurs opposés.
  7. Appareil de cuisson selon l'une quelconque des revendications précédentes, caractérisé en ce que deux rebords extérieurs opposés de l'élément chauffant (11, 311) à partir de la grille ou du tissu (10) sont raccordés à des bandes de contact (15a, 15b) en matériau de bande à conductivité électrique, de préférence sont sertis là-dedans, dans lequel de préférence pendant un processus en continu les bandes de contact (15a, 15b) sont raccordées à l'élément chauffant (11, 311) mécaniquement et électriquement en forme de composite, en particulier sont soudées.
  8. Appareil de cuisson selon l'une quelconque des revendications précédentes, caractérisé en ce que la grille ou le tissu (10) de l'élément chauffant (11, 311) présente des fils de chaîne ou des ficelles de chaîne (13) et des fils de trame ou des ficelles de trame (14), dans lequel de préférence exclusivement les fils de chaîne ou les ficelles de chaîne (13) présentent conductivité électrique pour la fonction d'élément chauffant, dans lequel en particulier l'élément chauffant présente la forme d'une grille avec des fils ou des ficelles (13, 14) s'étendant essentiellement à angle droit.
  9. Appareil de cuisson selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément chauffant (11, 311) est composé de sections d'élément chauffant et des zones intermédiaires s'étendant entre lesdites sections, dans lequel en particulier la proportion de la superficie des zones intermédiaires est supérieure à la proportion de la superficie des sections d'élément chauffant, de préférence d'un facteur de 2 à 20, en particulier d'un facteur de 5 à 10.
  10. Appareil de cuisson selon l'une quelconque des revendications précédentes, caractérisé en ce que l'élément chauffant (11, 311), de préférence sur des sections d'élément chauffant de conductivité électrique, est revêtu au moins partiellement d'un matériau d'activité catalytique, ou en ce que des fils ou des sections d'élément chauffant sont prévus et composés directement de matériau catalyseur.
EP17207786.9A 2016-12-19 2017-12-15 Dispositif de chauffage, appareil de cuisson doté d'un dispositif de chauffage et procédé de fabrication d'un élément chauffant Active EP3337291B1 (fr)

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DE102016225462.6A DE102016225462A1 (de) 2016-12-19 2016-12-19 Heizeinrichtung, Kochgerät mit einer Heizeinrichtung und Verfahren zur Herstellung eines Heizelements

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DE102019208228A1 (de) 2019-06-05 2020-12-10 E.G.O. Elektro-Gerätebau GmbH Heizeinrichtung mit einem flächigen Heizelement, Kochgerät mit und Verfahren zur Herstellung einer solchen Heizeinrichtung
WO2021170232A1 (fr) 2020-02-26 2021-09-02 E.G.O. Elektro-Gerätebau GmbH Dispositif de chauffage

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US20180176994A1 (en) 2018-06-21
EP3337291A1 (fr) 2018-06-20
ES2831383T3 (es) 2021-06-08
DE102016225462A1 (de) 2018-06-21

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