EP0176027B1 - Elément chauffant à rayons pour appareils de cuisson - Google Patents

Elément chauffant à rayons pour appareils de cuisson Download PDF

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Publication number
EP0176027B1
EP0176027B1 EP85111791A EP85111791A EP0176027B1 EP 0176027 B1 EP0176027 B1 EP 0176027B1 EP 85111791 A EP85111791 A EP 85111791A EP 85111791 A EP85111791 A EP 85111791A EP 0176027 B1 EP0176027 B1 EP 0176027B1
Authority
EP
European Patent Office
Prior art keywords
radiant heater
radiator heating
heating element
light
dark
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.)
Expired
Application number
EP85111791A
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German (de)
English (en)
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EP0176027A1 (fr
Inventor
Gerhard Goessler
Felix Schreder
Eugen Wilde
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Gerate Blanc und Fischer GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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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=EP0176027(B1) "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 EP88100897A priority Critical patent/EP0305633B1/de
Priority to AT85111791T priority patent/ATE40625T1/de
Priority to AT88100897T priority patent/ATE88607T1/de
Publication of EP0176027A1 publication Critical patent/EP0176027A1/fr
Application granted granted Critical
Publication of EP0176027B1 publication Critical patent/EP0176027B1/fr
Expired legal-status Critical Current

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    • 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 according to the preamble of claim 1.
  • an infrared radiator has become known, in which dark or medium and light radiator heating elements are arranged in a reflector.
  • the dark heater element consists of two infrared heaters with a surface temperature of up to max. 900 ° C. while the surface temperature of the heater heater should reach up to 2,000 ° C.
  • a radiant heater of the type mentioned at the outset has become known, which is intended for heating a glass ceramic hotplate. It contains light emitter and dark emitter heating elements, which are regulated in different power levels by diodes or the combination of series and parallel connections. A series connection of a dark heater element is expressly not always, but only temporarily provided for control purposes.
  • radiator heating elements can preferably be halogen incandescent lamps, which are designed as an elongated or bent tube
  • a resistance material based on molybdenum disilicit (MoSi Z ) can also be used, which without the quartz glass encapsulation of the halogen lamp glow temperatures in the bright visible area.
  • MoSi Z molybdenum disilicit
  • the last-mentioned resistance material which is commercially available under the name Kanthai-Super and has a glass-like structure, has a very high inrush current because its resistance is very low at low temperatures.
  • the dark radiator heating element acts as a series resistor as long as the resistance of the light radiator heating element is low, but its share in the total resistance as the resistance of the light radiator increases -Heating element when heated becomes less and less. This results in an automatic power shift from the dark radiator heating element to the light radiator while reducing the inrush current to an acceptable value.
  • Two dark radiator heating elements can preferably be provided, which are connected upstream of the light radiator in parallel, but which are connected in series in the continued cooking power range, where they alone provide heating.
  • the dark radiator heating element is preferably a conventional heating wire, which is usually arranged in a spiral shape and consists of an iron-chromium-aluminum material.
  • a material which is commercially available under the name 'Kanthal-A can be used.
  • Its annealing temperatures should preferably be kept below 1,500 K (approx. 1,200 ° C) and are normally at a maximum value of 1,350 K (approx. 1,100 ° C). They already glow relatively brightly, but their output is in the quite long-wave range, while the heating elements referred to here as light radiator heating elements can usually reach maximum temperatures that are well above the temperature limits mentioned above and some 200 K (approx. 1,700 ° C) reach or exceed. However, it may well be that in the down-regulated state the specified temperature limits are also partially exceeded.
  • the dark radiators are arranged in the central region of the radiant heater, which is surrounded by a ring region which receives the light radiators. This clearly delimits the cooking zone on the glass ceramic plate.
  • the ideal would be a ring-shaped light heater that surrounds the dark heater zone in a ring.
  • the molybdenum disilicit heating elements that can be arranged, for example, in a meandering shape in such a ring area, but it is difficult in terms of production technology to produce halogen spotlights in this shape with a sufficient service life. For this reason, straight radiators in polygonal shape, for example in triangular or quadrangular form, can be arranged around the dark radiator area.
  • the dark emitters can be fixed on strip-like or plate-shaped insulating supports by partially embedding them, the insulating supports being attached between the light emitters parallel to them.
  • the embedding can be carried out in the usual way, but preferably as described in DE-PS 27 29 929, the heating coils being fixed only over part of their length and / or their circumference by being pressed into the insulating material before it is finally cured.
  • encapsulated light emitters for example halogen emitters
  • quartz glass jacket there is obviously an improvement in efficiency if the surface of the insulating body is provided with a reflective coating, preferably a layer of titanium dioxide.
  • the glass-ceramic plate is no longer heated as strongly when using light emitters, especially if it consists 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. It can be arranged mainly in the dark spot area because the greatest installation height is available in it. If it is preferably arranged parallel to a light emitter, it detects the temperature of the dark emitter directly, but is also influenced laterally by the light emitter and does not significantly increase the overall height.
  • the light emitters in a special heating circuit, as is known for other hotplates from DE-OS 31 44 631, to which reference is made here.
  • the temperature switch is provided with a temperature set according to a parboiling temperature and such a large switching delay that it does not normally switch on again after it has been switched off during the operation of the radiant heater. It switches the light emitter off after a certain heating phase, so that there is an automatic heating circuit.
  • the power control device can be provided with an additional switch that can be switched manually via an adjustment shaft of the power control device, which is preferably contained in a front-mounted switch and the at least one light source in an upper power range switches on, especially when the power control unit has a power setting of 100% relative duty cycle.
  • the light source is only switched on in the upper power range and is therefore used for quick heating, for which it is particularly well suited. Its total operating time remains short, so that this relatively expensive component with a limited lifespan is protected.
  • radiation shielding can be provided in the edge area. It can be formed by an annular insulating cover plate which, lying on the edge, is pressed onto the cooking surface and, because it preferably consists of a denser but temperature-resistant insulating material, has a relatively sharp cut. If it protrudes inwards 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 interior 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 will avoid light from the ends of the light emitter penetrates into the area of the cooking device lying outside the cooking zones and the glass ceramic plate also in this area, mostly unevenly, is illuminated from below, which is visually disturbing and would also lead to undesired heating of the cooking device.
  • 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 is placed in the edge region, which rests on the underside of the glass ceramic plate.
  • 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.
  • the halogen lamps are designed as straight, for example, comprise a tungsten filament, which contained in a quartz glass tube in a halogen atmosphere and supported by intermediate webs is.
  • a quartz glass tube in a halogen atmosphere and supported by intermediate webs is.
  • Such steel are described in GB-PS 173 023, to which reference is made.
  • Your filament works at temperatures in the order of 2400 K (2 700 ° C) 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 this spectral range pass, 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 on their two sides connections 21 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 project 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.
  • the three heaters protrude parallel and at the same distance from each other over the heated area. Between them, strip-shaped insulating supports 24 made of insulating material are inserted, on the top of which conventional dark heater elements 25 are attached.
  • the dark radiators 25 consist of heating coils made of resistance wire, for example an iron-chromium-aluminum alloy, which is used up to temperatures of approximately 1,500 K (1,200 ° C.). They are partially embedded in the surface of the insulating support 24 by the lower part of their turns being pressed into the insulating support at intervals from one another or also over the entire length before it hardens.
  • other attachment options are also conceivable, for example using metal needles, putty or the like.
  • the strip-shaped insulating supports 24 leave gaps 26 between them in which the light emitters are arranged, so that the entire heater forms approximately one plane, although the light emitters have a larger outer diameter than the heating coils.
  • the dark radiators 25 indicated by dash-dotted lines in the drawings form two dark radiator heating zones 27 between the three bright radiators 20 and can also additionally form a dark radiator heating zone 27 on either side of the outer bright radiators, although this is not always necessary.
  • the heating coils are in on the insulating supports Zigzag shape laid and their connection ends in the usual way, not shown, led out of the radiant heater through insulating bushings.
  • FIG. 3 shows a radiant heater 11 in which the dark radiator heating zone 27, which can also be divided into several individually switchable heating resistors, occupies a circular, relatively large central region which is surrounded by a radiant heater region 28 in the form of a circular ring.
  • two light emitters 20 are arranged in the form of halogen incandescent lamps, the radiation area of which is approximately semicircular, while the connection ends are formed opposite one another and in alignment with one another and project outwards through the edge 14.
  • the temperature sensor 18 runs diametrically and essentially parallel to the connection ends, so that it detects the temperature of the dark radiator heating zone 27 in the best possible way and is less influenced by the bright radiators.
  • FIGS. 4 to 8 each contain the dark radiators 25 already described on an insulating support 24.
  • two light radiators 20 are arranged on either side of a central, rectangular dark radiator heating zone 27, so that a rectangular heating field is obtained which results in one Radiant heater with a somewhat flattened on two sides, but otherwise with a circular border.
  • the areas 29, which are free of radiators, are influenced by the radiation from the light emitters 20 before the edge 14 shields them.
  • the rod-shaped temperature sensor 18 of the temperature limiter 17 runs on one side to the heating zone 27 parallel to one of the light emitters 20 over the heated area 23 and receives the radiation from the dark emitters 25 from below and the radiation from the light emitter 20 from the side.
  • FIG. 5 shows an embodiment in which four light emitters 20 in the form of straight rods are arranged parallel to one another. Between them, in each case on strip-shaped insulating supports 24, dark radiators 25 are arranged, each of which is connected in series with one another by a connection which runs under the light radiator 20. Each insulating support 24 carries two heating coils which run parallel to one another and are arranged in a straight line. The light emitters are arranged in the gaps 26 between the insulating supports 24 and the temperature sensor 18 of the temperature limiter 17 runs diagonally across the light emitters and the dark emitter areas.
  • FIG. 6 shows an embodiment in which four straight, rod-shaped light emitters 20 in the form of a square are arranged in such a way that their radiating regions lie within the heated region 23 of the circular radiant heater. Adjacent light emitters are offset from one another in height so that they cross each other in the area of the connection ends and are therefore easy to connect.
  • the rectangular, preferably square, enclosed central region is designed as a dark radiator zone 27 and is zigzagged with conventional heating resistance coils. The light emitters accordingly form a light emitter heating zone 28 surrounding the dark emitter heating zone 27.
  • FIG. 7 A comparable arrangement is shown in FIG. 7, in which three straight rod-shaped light emitters 20 in the form of an equilateral triangle are arranged in a similar manner as in FIG. 6.
  • the triangular central zone enclosed by them is the dark heater heating zone 27, in which a dark heater heater coil 25 is arranged in the form of a spiral.
  • 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. 8 shows an embodiment in which the light and dark radiators are arranged as in FIG. 4.
  • a temperature sensor 30 is arranged in the form of a circular flat sensor box, which is located in a central one through the radiant heater Sleeve 31 protruding from below is arranged and pressed resiliently upwards onto the glass ceramic plate.
  • the sensor socket 30 is filled with an expansion liquid and connected via a capillary tube 32 to an expansion socket in a temperature sensor, not shown. It senses the temperature of the underside of the glass ceramic plate and therefore also receives feedback from the cooking vessel.
  • FIG. 9 shows an arrangement of the dark radiators 25 on an insulating support 24 which, at the points at which the light radiator 20 and the temperature sensor 18 of the temperature limiter are arranged, has depressions which also contain dark radiators, so that they pass under the light radiators and the temperature sensor , but reduce the overall height.
  • the light heater 20a is designed as a meandering strip or wire made of a resistance material based on molybdenum disilicit, which is arranged in the basic form of an annular light heater heating zone 28 indicated by dashed lines.
  • the dark radiator heating element 25 occupying the dark radiator heating zone 27 is divided by a central tap 33 into two heating resistors 34, 35.
  • the central tapping is at least a light emitter 20a connected upstream, the other pole of which is connected to a terminal 36 of an auxiliary switch 37, while the heating resistor 35 is connected to another pole 38 of the auxiliary switch and the heating resistor 34 is connected via the temperature limiter 17 to the output pole 39 of a power control device 40.
  • the power control device 40 is shown as a clocking, thermally actuated power control device with an adjusting knob 41 and an adjusting shaft 42 and contains a switch 43, preferably a snap switch, which is actuated by a bimetal 44 which is heated by a control heater 45.
  • the control heating is parallel to the heating resistors of the radiant heater 11 and is switched on and off together with these.
  • the released power ie the amount of the relative duty cycle of the switch 43 is determined via the adjusting knob 41 and the adjusting shaft 42, which, for example, infinitely determines the time and duration of the activation by adjusting the position of the bimetal relative to the switch 43.
  • the power switch 40 saddles the attachment switch 37, which contains two switch contacts 46, 47 which can be actuated by the setting shaft 42 of the energy regulator and which has the one pole 48 of the household power network between the position shown in which the connection 38 is contacted to one position can switch in which the terminal 36 is connected to the pole 48. In this position, the contact 46 connects a line branch 49, which branches off from the line branch 50 and runs between the heating resistor 34 and the temperature limiter 17, with the contact 38.
  • the clock switch 43 of the power control device is closed by a corresponding setting via the setting shaft 42, and not when the bimetal 44 is heated by the control heater 45 open.
  • the contact 47 of the front switch 37 connects the light emitter 20a to the pole 48 of the household network, while the other pole 51 of the household network via the closed switch 43 and the then closed switch of the temperature limiter 17, as well as the bridging contact 46, the line 49 and the connection 38 both dark radiator heating resistors 34, 35 is placed, which on the other hand are connected via the center tap 33 to the bright radiator 22a.
  • the two conventional heating resistors 34, 35 are connected in parallel to one another, but together in series with the light radiator 20a.
  • the light emitter has a very low resistance when cold, so that the heating resistors 34, 35 serve as series resistors and keep the inrush current low.
  • the temperature of the light radiator 20a increases, its resistance increases and the resistance component of the conventional heating resistors 34, 35 decreases. Both heating zones 27, 28 are therefore heated, but with an overweight on the light emitter zone 28, which indicates to the user that rapid heating takes place in the enclosed circular area.
  • the total power can be switched off by the temperature limiter 17 before the glass ceramic plate overheats.
  • Is switched back to a lower heating level which is optionally at 100% or z. B. can only start at 70% ED, then the contact is automatically switched from connector 36 to 38 in the front switch 37 and the contact 46 opens. As a result, the light radiator 20 is switched off and the two heating resistors 34, 35 are connected in series. In this lower power setting, they are clocked and supplied with power, although the 100 percent power setting only enables 70% of the total power because they are in series. This makes it possible to reproducibly set particularly low power values down to the order of 4% ED.
  • dark emitters are also used in addition to light emitters not only saves on expensive light emitters and an improved control option, but also ensures that the light appearance of the light emitters does not become too glaring and that, especially with clocked outputs, the power impacts are somewhat dampened in their effect on the food to be cooked, which would otherwise be disruptive due to the low heat replenishment with light emitters.
  • FIGS. 12 and 13 show a radiant heater 11 of the type described above with two mutually parallel bright radiators 20, which are arranged at a distance of approximately half the radiant heater diameter from one another and contain dark radiators 25 between them and in the remaining circular segments.
  • the straight light emitter tubes run from edge to edge of the radiant heater 11.
  • a straight rod-shaped temperature sensor 18 of a temperature limiter 17 runs approximately centrally between the light emitters 20 and parallel to them over the central dark emitter heating zone 27.
  • a temperature sensor 60 in the form of a flat sensor box filled with expansion fluid is arranged outside the edge of the radiant heater. It is protruded by a resilient locking mechanism 61 and a compression spring 62 contained therein on the underside of one over the radiator edge 22 pressed the section 63 of a heat transfer element 64 made of sheet metal. This is attached to the upper edge of the sheet metal dish 12 by means of a push-on fastening 65, which consists of bent sheet metal tabs, and projects between the edge 22 and the underside of the cooking surface 15 into the heated area 23, which is in a lenticular border on the edge Area 66 partially covered.
  • a bead arrangement 67 ensures increased rigidity there.
  • the heat transfer element lies flat against the hotplate and is heated from below by the radiation from the dark radiators, in the area in which it is located, in the same way as the cooking area 15, but also receives a certain, but very much limited radiation portion from the light emitters, so that it primarily receives the temperature of the dark emitters, which is important for temperature control, as well as a certain reaction from the cooking surface and the cooking vessel.
  • the temperature sensor is outside protected against the high temperature and still has good access via the heat transfer element.
  • the heat transfer element preferably consists of an iron sheet which is clad with an approximately equally thick layer of aluminum on the side facing the cooking surface and contains a very thin aluminum cladding on the opposite side.
  • the temperature controller 69 contains an expansion socket 70 connected to the capillary tube 68, to which an expansion space 71 is additionally connected, which is arranged in a ventilated space parallel to the controller housing and is heated by a control heater 73.
  • FIGS. 14 to 16 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 thicker 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 against the underside of the cooking surface 15 and is usually pressed against it by a spring force acting on the sheet metal shell 12.
  • two bright radiator heating elements 20 are provided, which can also be referred to as high-temperature radiant heaters and, as already described, consist of high-temperature heating coils 83 enclosed in quartz pistons 82, which emit radiation far in the visible range and at temperatures far above Work at 1,500 K (approx. 1,200 ° C). They are in the form of elongated rods or festoons which have a flattened section 84 at both ends, from which the connection ends 21 protrude and are welded there to connection lines. In the example, two light emitters 20 are arranged in parallel and at a distance from one another which corresponds to approximately half the diameter of the radiant heater.
  • dark radiator heating elements 25 are arranged, which consist of heating coils of conventional resistance materials used for radiant heaters, for example an iron / chromium / aluminum alloy up to temperatures of approx. 1 500 K (1 200 ° C) without encapsulation or protective gas atmosphere.
  • These heating coils are arranged in a shape that is adapted to the shape of the respective dark heater zone 27 in a substantially spiral manner and are partially embedded in the material of the insulating support, e.g. B. 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.
  • 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 in it, so that the light emitter is guided in the transverse and longitudinal directions in the edge recess 86. 87.
  • the edge recess is provided in FIGS. 14 to 16 in the edge 22 and is open at the top.
  • the cover 81 covers the opening of the edge recess and thus shields it from the top, so that it is not visible from above.
  • the end section, and in particular the flattened section 84 is coated with a light-absorbing or reflecting layer 89, which in particular also 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 thereby be lowered, which is very desirable because a critical point of halogen spotlights is the temperature at the pinch point through which the connection 21 is led to the outside. If this temperature rises too high, the tightness of the lamp could be jeopardized by oxidation processes at the lead-through point.
  • the 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 114a and partially surrounds the end section at a good distance upwards, on both sides and in the region of the end face.
  • the shielding of the end face 91 is particularly important because the radiation exits there particularly intensively, as from a light guide.
  • the edges 93 of the cover 92 surrounding the end section 84 extend to the lower level of the cover panel 114a and thus to the central plane of the light radiator.
  • this division plane can also be set further up or preferably down with respect to the light emitter, in order to be able to encompass the end section 90 even further with the edge 93.
  • the distance with which the light emitter end is surrounded is important, so that heat can be dissipated from there and the end is not overheated.
  • a combination of the two embodiments with the cover 92 and the layer 89 is particularly preferred.
  • 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 then important, for example. if the light emitter itself has a reflective layer on the outside or inside of its bulb 82. Above all, it is also advantageous. that by the arrangement according to the invention expensive end base 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 are so different, for example, 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. 19 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.

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

Claims (23)

1. Elément chauffant à rayons pour appareils de cuisson, comprenant une pièce chauffante électrique (20, 20a) à radiateurs lumineux qui, conformément à sa conception, fonctionne à une température accrue excédant 1 500 K, ce qui correspond environ à 1 200 °C, et au moins une zone chauffante (27) munie d'une pièce chauffante (25) à radiateurs obscurs qui fonctionne, conformément à sa conception, à des températures inférieures à 1 500 K, ce qui correspond environ à 1200°C, les radiateurs lumineux et obscurs étant enclenchables simultanément, caractérisé par le fait que la pièce chauffante (20, 20a) à radiateurs lumineux et la pièce chauffante (25) à radiateurs obscurs sont disposées attenantes à une surface de cuisson réalisée sous la forme d'une plaque en vitrocérame (15) : et par le fait que, au cours du fonctionnement de la pièce chauffante (20, 20a) à radiateurs lumineux, la pièce chauffante (25) à radiateurs obscurs est, en permanence, branchée en série en amont de ladite pièce.
2. Elément chauffant à rayons selon la revendication 1, caractérisé par le fait que la pièce chauffante (20a) à radiateurs lumineux consiste en un matériau résistif à base de bisiliciure de molybdène (MoSi2).
3. Elément chauffant à rayons selon la revendication 1 ou 2, caractérisé par la présence de moyens de commutation (47) à l'aide desquels la pièce chauffante (25) à radiateurs obscurs est enclenchable seule, par impulsions, éventuellement par l'intermédiaire d'un appareil synchronisateur (40) de commande de puissance.
4. Elément chauffant à rayons selon l'une des revendications précédentes, caractérisé par la présence d'une ou plusieurs autres pièces chauffantes (34, 35) à radiateurs obscurs, branchée(s) en série en amont de la pièce chauffante (20, 20a) à radiateurs lumineux, et par la présence de moyens de commutation (37) à l'aide desquels les pièces chauffantes (34, 35) à radiateurs obscurs peuvent être branchées mutuellement en parallèle ou en série.
5. Elément chauffant à rayons selon l'une des revendications précédentes, caractérisé par le fait que la ou les pièce(s) chauffante(s) (25) à radiateurs obscurs est/sont disposée(s) uniquement dans la région centrale de l'élément chauffant (11) à rayons qui est entourée par une région annulaire (28) recevant la pièce chauffante (20, 20a) à radiateurs lumineux, des barrettes-radiateurs lumineuses rectilignes étant, de préférence, agencées en forme de polygone tout autour de zones chauffantes (27) à radiateurs obscurs.
6. Elément chauffant à rayons selon l'une des revendications 1 à 4, caractérisé par le fait qu'il est prévu, à l'extérieur de la région centrale délimitée par la pièce chauffante (20) à radiateurs lumineux, au moins une zone chauffante (27) qui est munie de la pièce chauffante (25) à radiateurs obscurs, et est de délimitation circulaire vers l'extérieur.
7. Elément chauffant à rayons selon l'une des revendications précédentes, caractérisé par le fait que des zones chauffantes (27) dotées de pièces chauffantes (25) à radiateurs obscurs sont intercalées entre les pièces chauffantes (20) à radiateurs lumineux qui consistent préférentiellement en des lampes halogènes et s'engagent rectilignement à travers la région (23) de l'élément chauffant (11) à rayons chauffée, de préférence, de manière sensiblement circulaire, les pièces chauffantes (20) à radiateurs lumineux étant disposées, de préférence, au voisinage d'interstices (26) ou renfoncements entre des supports isolants (24) qui portent les pièces chauffantes (25) à radiateurs obscurs.
8. Elément chauffant à rayons selon l'une des revendications précédentes, caractérisé par le fait que la pièce chauffante (25) à radiateurs obscurs s'étend d'un trait au-dessous de la pièce chauffante (20) à radiateurs lumineux.
9. Elément chauffant à rayons selon l'une des revendications précédentes, caractérisé par le fait que, dans la région recouverte par la pièce chauffante (20) à radiateurs lumineux, la surface d'un support isolant (24), sur lequel la pièce chauffante (25) à radiateurs obscurs est disposée, est encaissée par rapport au reste de la surface du support isolant (24).
10. Elément chauffant à rayons selon l'une des revendications précédentes, caractérisé par le fait que les pièces chauffantes (25) à radiateurs obscurs sont assujetties, par enrobage partiel, sur des supports isolants (24) en forme de bandes ou de plaques qui sont implantés entre les pièces chauffantes (20) à radiateurs lumineux, parallèlement à celles-ci.
11. Elément chauffant à rayons selon l'une des revendications précédentes, caractérisé par le fait qu'une sonde thermométrique (18) d'un limiteur de température (17), configurée en une baguette, est de préférence disposée parallèlement à une pièce chauffante (20) à radiateurs lumineux, en juxtaposition à cette pièce, en faisant saillie au-delà d'une zone chauffante (27) à radiateurs obscurs.
12. Elément chauffant à rayons selon l'une des revendications précédentes, caractérisé par le fait qu'un interrupteur thermostatique est branché en amont de la pièce chauffante (20, 20a) à radiateurs lumineux, avec une température réglée pour correspondre à une température d'amorce de cuisson, et avec une temporisation d'enclenchement telle qu'il ne se réenclenche pas, au cours du fonctionnement de l'élément chauffant (11) à rayons, une fois qu'il a été déclenché.
13. Elément chauffant à rayons selon l'une des revendications précédentes, caractérisé par le fait qu'un appareil synchronisateur (40) de commande de puissance est muni d'un interrupteur supplémentaire (37) qui est enclenchable manuellement par l'intermédiaire d'un arbre de réglage (42) de l'appareil de commande de puissance, est de préférence renfermé par un interrupteur auxiliaire, et enclenche additionnellement le radiateur lumineux (20a) prévu au minimum, dans une plage de puissance supérieure, en particulier lors d'un réglage de puissance de l'appareil (40) de commande de puissance sur une durée d'enclenchement relative de 100 %.
14. Elément chauffant à rayons selon l'une des revendications précédentes, caractérisé par le fait que, dans les plages de puissance moyenne et inférieure, le montage en série constitué des pièces chauffantes (20, 25) à radiateurs lumineux et obscurs est alimenté en tension, de manière synchronisée, par un appareil (40) de commande de puissance.
15. Elément chauffant à rayons selon l'une des revendications précédentes, caractérisé par le fait qu'une sonde thermométrique (60) est dotée d'une pièce de transfert thermique (64) revêtant la forme d'une tôle qui recouvre, dans la région marginale de l'élément chauffant (11) à rayons, un tronçon d'au moins une pièce chauffante (25) à radiateurs obscurs et qui est intercalée entre ce dernier et la surface de cuisson (15), en contact avec ceiie-ci : et par le fait que la sonde thermométrique, de préférence réalisée sous la forme d'un boîtier de détection (60) empli d'un fluide d'expansion, est disposée à l'extérieur de l'élément chauffant (11) à rayons, en contact thermique avec la pièce de transfert thermique (64).
16. Elément chauffant à rayons selon l'une des revendications précédentes, caractérisé par un blindage anti-rayonnement (89, 92. 93, 114, 114a) dans la région marginale de cet élément chauffant (11) à rayons.
17. Elément chauffant à rayons selon la revendication 16, caractérisé par le fait que le blindage anti-rayonnement (89, 92, 93) protège, par écran, les tronçons extrêmes de la pièce chauffante (20) à radiateurs lumineux vis-à-vis de la région de l'appareil de cuisson (100) qui est située en dehors de l'élément chauffant (11) à rayons.
18. Elément chauffant à rayons selon la revendication 16 ou 17, caractérisé par le fait que le bord (22) d'un corps isolant (24) de cet élément chauffant (11) à rayons est recouvert par un blindage anti-rayonnement tourné vers la surface de cuisson (15) et réalisé, de préférence, sous la forme d'un cache d'isolation (114, 114a) substantiellement annulaire, le cache (114, 114a) consistant notamment en un matériau isolant qui possède une plus grande robustesse et éventuellement une plus grande densité que le corps isolant (24) sous-jacent ; étant de préférence fabriqué en une masse d'isolation thermique résistant à des températures élevées et pourvue de liants minéraux ; et faisant avantageusement saillie vers l'intérieur, sur son pourtour interne (81) de préférence délimité par des arêtes vives, au-dessus du pourtour interne correspondant (80) du bord (22) du corps isolant (24), en présentant notamment une hauteur relativement modeste en comparaison de la largeur de l'anneau.
19. Elément chauffant à rayons selon l'une des revendications précédentes, caractérisé par le fait qu'au moins un tronçon extrême de la pièce chauffante (20) à radiateurs lumineux est muni d'une couche (89) absorbant et/ou réfléchissant la lumière, qui forme un blindage anti-rayonnement, en particulier la face frontale (91) du radiateur lumineux étant largement recouverte par ladite couche.
20. Elément chauffant à rayons selon l'une des revendications précédentes, caractérisé par le fait que le tronçon extrême (90) de la pièce chauffante (20) à radiateurs lumineux, prévu au minimum, est entouré vers le haut, ainsi qu'au moins en partie latéralement et au voisinage de la face frontale (91) de ce tronçon extrême (90), par un recouvrement (92) qui forme un blindage anti-rayonnement et se raccorde à l'évidement marginal (86, 87), et le recouvrement (92) constitue de préférence une partie de l'isolation thermique (24, 114. 114a) de l'élément chauffant (11) à rayons ; élément dans lequel, de préférence, au moins des parties du recouvrement (92) peuvent être prévues sur le cache (114a) et ce cache (114a) peut englober au moins une partie de l'évidement marginal (86b) ; et dans lequel le recouvrement (92), coiffant la partie, tournée vers la surface de cuisson (15), du tronçon extrême (90) de la pièce chauffante (20) à radiateurs lumineux, et éventuellement aussi l'une des parties de ce tronçon extrême, présente de préférence un bord périphérique (93) et est ouvert vers le bas.
21. Elément chauffant à rayons selon l'une des revendications précédentes, caractérisé par le fait que l'évidement marginal (86, 87) est prévu dans un bord (22) d'un corps isolant (24), et est de préférence ouvert vers le haut.
22. Elément chauffant à rayons selon l'une des revendications précédentes, caractérisé par le fait que le recouvrement (92) entoure à distance, au moins partiellement, le tronçon (84) de la pièce chauffante à radiateurs lumineux qui est logé dans ce recouvrement.
23. Elément chauffant à rayons selon l'une des revendications précédentes, caractérisé par le fait qu'un tronçon (84) notamment aplati et de section réduite, à l'extrémité de la pièce chauffante (20) à radiateurs lumineux, passe à travers une ouverture extérieure (87) de l'évidement marginal (86), de configuration adaptée en forme de fente.
EP85111791A 1984-09-22 1985-09-18 Elément chauffant à rayons pour appareils de cuisson Expired EP0176027B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP88100897A EP0305633B1 (en) 1984-09-22 1985-09-18 Radiative heating body for a cooking apparatus with a high-intensity or a high-temperature radiation-heating element
AT85111791T ATE40625T1 (de) 1984-09-22 1985-09-18 Strahlheizkoerper fuer kochgeraete.
AT88100897T ATE88607T1 (de) 1984-09-22 1985-09-18 Strahlheizkoerper fuer kochgeraete mit einem helloder hochtemperatur-strahlungsheizelement.

Applications Claiming Priority (4)

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

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP88100897A Division EP0305633B1 (en) 1984-09-22 1985-09-18 Radiative heating body for a cooking apparatus with a high-intensity or a high-temperature radiation-heating element
EP88100897.3 Division-Into 1988-01-22

Publications (2)

Publication Number Publication Date
EP0176027A1 EP0176027A1 (fr) 1986-04-02
EP0176027B1 true EP0176027B1 (fr) 1989-02-01

Family

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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 After (1)

Application Number Title Priority Date Filing Date
EP85111989A Expired - Lifetime EP0176063B1 (fr) 1984-09-22 1985-09-21 Elément chauffant à rayonnement 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)

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DE3144631A1 (de) * 1981-11-10 1983-05-26 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen Elektrokochplatte
DE3204760A1 (de) * 1982-02-11 1983-08-18 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Kochfeld aus glaskeramischem material mit einem strahlungsheizkoerper
EP0103741B1 (fr) * 1982-09-16 1988-11-17 E.G.O. Elektro-Geräte Blanc u. Fischer Elément chauffant, en particulier élément chauffant radiant pour le chauffage de plaques en céramique
JPS59123180A (ja) * 1982-12-24 1984-07-16 ソ−ン　イ−エムアイ　ドメスティック　アプライアンス　リミテッド 加熱装置
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GB8316304D0 (en) * 1983-06-15 1983-07-20 Emi Plc Thorn Heating apparatus
GB8316306D0 (en) * 1983-06-15 1983-07-20 Thorn Emi Domestic Appliances Heating apparatus
GB8318457D0 (en) * 1983-07-07 1983-08-10 Thorn Emi Domestic Appliances Heating apparatus
DE3406604C1 (de) * 1984-02-23 1985-07-25 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Heizeinrichtung fuer Strahlungsheizstellen mit elektrischen Strahlungsheizelementen

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0316986A1 (fr) * 1987-11-06 1989-05-24 Koninklijke Philips Electronics N.V. Unité de cuisson électrique et appareil de cuisson électrique muni d'une telle unité
EP0337147A2 (fr) * 1988-04-15 1989-10-18 E.G.O. Elektro-Geräte Blanc u. Fischer Elément chauffant radiant
EP0337147A3 (fr) * 1988-04-15 1990-12-05 E.G.O. Elektro-Geräte Blanc u. Fischer Elément chauffant radiant
DE3840360A1 (de) * 1988-11-30 1990-05-31 Ego Elektro Blanc & Fischer Strahlungs-heizkoerper
US5004892A (en) * 1988-11-30 1991-04-02 E.G.O. Elektro-Gerate Blanc U. Fischer Radiant element
US5032706A (en) * 1989-02-11 1991-07-16 E.G.O. Elektro-Gerate Blanc U. Fischer Electric radiant heater
GB2257002A (en) * 1991-06-21 1992-12-23 Electrolux Cookers Ceramic electric hob
EP0671863A2 (fr) * 1994-03-09 1995-09-13 Ceramaspeed Limited Elément de chauffage électrique royannant
US5866879A (en) * 1995-11-15 1999-02-02 Ceramaspeed Limited Infra-red heater arrangement
US6034358A (en) * 1998-04-30 2000-03-07 Ceramaspeed Limited Radiant electric heater
DE19853542A1 (de) * 1998-11-20 2000-05-25 Ego Elektro Geraetebau Gmbh Strahlungsheizkörper und Verfahren zu seiner Herstellung

Also Published As

Publication number Publication date
EP0176027A1 (fr) 1986-04-02
US4808798A (en) 1989-02-28
EP0176063B1 (fr) 1990-05-30
ES8701360A1 (es) 1986-11-16
YU148385A (en) 1988-02-29
EP0176063A1 (fr) 1986-04-02
JPS6180788A (ja) 1986-04-24
AU584356B2 (en) 1989-05-25
JPH081826B2 (ja) 1996-01-10
AU4764185A (en) 1986-03-27
ES547144A0 (es) 1986-11-16
US4700051A (en) 1987-10-13

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