EP0176027A1 - 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
EP0176027A1
EP0176027A1 EP85111791A EP85111791A EP0176027A1 EP 0176027 A1 EP0176027 A1 EP 0176027A1 EP 85111791 A EP85111791 A EP 85111791A EP 85111791 A EP85111791 A EP 85111791A EP 0176027 A1 EP0176027 A1 EP 0176027A1
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EP
European Patent Office
Prior art keywords
radiant heater
dark
light
radiator
radiators
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
EP85111791A
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German (de)
English (en)
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EP0176027B1 (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(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE3503648A external-priority patent/DE3503648C2/de
Application filed by EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Priority to AT85111791T priority Critical patent/ATE40625T1/de
Priority to AT88100897T priority patent/ATE88607T1/de
Priority to EP88100897A priority patent/EP0305633B1/de
Publication of EP0176027A1 publication Critical patent/EP0176027A1/fr
Application granted granted Critical
Publication of EP0176027B1 publication Critical patent/EP0176027B1/fr
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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 with a glass ceramic plate, with electric bright radiator heating elements, which operate as intended at an elevated temperature above 1500 K (approx. 1200 degrees Celsius) and whose radiation spectrum extends considerably into the visible range.
  • Such radiant heaters are known for example from GB-PS 1 273 023.
  • a light source heating element they have halogen lamps that emit their energy in the visible and infrared range and thus shine through a glass ceramic plate. Due to the low thermal mass, the heating-up times are quite short and the operator also has good control over the function due to the light emission.
  • it is difficult to regulate in the lower power range which sometimes involves switching on required by power diodes.
  • the inrush currents are often very high because the resistance materials of the light emitters have a relatively high positive temperature coefficient. The controllability requires a larger number of light emitters, which determine the costs for a radiant heater.
  • the radiant heater in addition to at least one bright radiator, has at least one heating zone with a dark radiator heating element which is intended to operate at temperatures below 1500 K (approx. 1200 degrees Celsius) and which can be switched on simultaneously and / or alternately with the bright radiator.
  • the light emitters can preferably be halogen incandescent lamps which are designed as an elongated or bent tube
  • a resistance material based on molybdenum disilicit (MoSi 2 ) can also be used which, without the quartz glass encapsulation of the halogen lamp, has glow temperatures in the brightly visible range can reach.
  • MoSi 2 molybdenum disilicit
  • the latter resistance material which is commercially available under the name Kanthal-Super and has a glass-like structure, has a very high inrush current because its resistance is very low at low temperatures.
  • At least one dark emitter is connected in series, while preferably in the lower continued cooking power range only dark emitters, possibly heated by a clocking power control unit, are switched on.
  • the dark emitter acts as a series resistor, but its share in the total resistance as the resistance of the light emitter increases Heating is getting lower. This results in an automatic power shift from the dark radiator to the light radiator while reducing the inrush current to an acceptable value.
  • Two dark emitters can preferably be provided, which are connected upstream of the light emitter in parallel, but which are connected in series in the continued cooking power range, where they alone provide heating.
  • the dark radiator 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 1500 K (approx. 1200 degrees Celsius) and are normally at a maximum value of 1350 K (approx. 1100 degrees Celsius). They also glow relatively bright, but their output is in the quite long-wave range, while the heating elements referred to here as light emitters can usually reach maximum temperatures that are far above the above-mentioned temperature limits and some 2000 K (approx. 1700 degrees Celsius) 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 receiving 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 which 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 lamps in this form with a sufficient service life. For this reason, straight radiators in a polygonal shape, for example triangular or quadrangular, 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 A Bedding 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 finally hardens.
  • encapsulated light emitters such as halogen emitters
  • quartz glass jacket there is a noticeable 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 temperature limiter can be switched so that it switches off the dark radiators and the light radiators remain as residual power.
  • 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 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 turns on, especially when the power setting of the power control unit is 100 percent 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.
  • a multi-cycle circuit preferably a seven-cycle circuit, in parallel, individual and series connection of the radiators.
  • light emitters are also switched on, so that a visual inspection is still available for the user, but with a smaller number of light emitters, a better power gradation is possible, particularly in the lower power range.
  • 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 somewhat beyond the actual edge, which is made of highly insulating but less rigid material, then it alone determines the visual effect of the hob, and it is avoided that the cooking surface looks "frayed" due to a blurred inner border.
  • the radiation shielding can additionally or instead of the cover panel consist of a light-absorbing or reflecting layer on the connection ends of the light emitter. This prevents light from penetrating from the ends of the light emitter into the area of the cooking appliance outside the cooking zones and illuminating the glass ceramic plate in this area, usually unevenly, from below, which is visually disturbing and would also lead to undesired heating of the cooking appliance .
  • the radiation shielding can also be provided as a cover for a connection end of the light heater element, which can be part of the insulation and particularly preferably part of the cover panel. A combination of these measures is particularly preferred.
  • an insulation 13 is arranged in a flat sheet metal shell 12, onto which a ring 14 made of somewhat stronger insulating material than that of the layer 13 is placed in the edge region, which rests on the underside of the glass ceramic plate.
  • the radiant heater 11 heats a cook standing thereon through this glass ceramic plate 15 vessel 16.
  • a temperature limiter 17 with a rod-shaped temperature sensor 18 protrudes over the heated area of the radiant heater and contains in its switch head 19 arranged outside the area of the shell 12 switches which influence the power supply to the radiant heater and possibly switch off partial heating elements.
  • three light emitters 20 are present which are designed as straight halogen incandescent lamps which contain, for example, a tungsten filament which is contained in a quartz glass tube in a halogen atmosphere and is supported by intermediate webs.
  • a tungsten filament which is contained in a quartz glass tube in a halogen atmosphere and is supported by intermediate webs.
  • Such steel are described in GB-PS 173 023, to which reference is made.
  • Its filament works at temperatures in the order of 2400 K (2700 degrees Celsius) and, in addition to an infrared component, also generates a high proportion of visible light in the white area.
  • the glass ceramic plate 15 is set up to at least partially let 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 connections 21 on both sides, which project beyond the edge 22 of the sheet metal shell 12 and are connected there with corresponding connecting lines.
  • the ends of the three light emitters 20 protrude through the edge 14 and are located with their shining ones Area within the circular heated surface 2 3 of the radiant heater, which is formed in the bowl-shaped interior of the radiant heater.
  • the three light emitters 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-chrome. Aluminum alloy, which is used up to temperatures of approx. 1500 K (1200 degrees Celsius). 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 laid on the insulating supports in a zigzag shape and their connection ends are led out of the radiant heater in the usual manner, not shown, through insulating bushings.
  • FIG. 3 shows a radiant heater 11 in which the dark radiator heating zone 27, which can also be divided into a plurality of 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 manner 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 9 -ind, each on strip-shaped insulating supports 24, dark emitters 25 are arranged, each of which is connected in series with one another by a connection which runs under the light emitter 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 of titanium dioxide is applied to the insulating layer 13, which is a good one Reflection of the radiation from the light emitter results.
  • FIG. 8 shows an embodiment in which the light and dark radiators are arranged as in FIG. 4.
  • a temperature sensor 30 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.
  • Figure 9 shows an arrangement of the dark radiator 25 on an insulating support 24 which has recesses at the points at which the light radiator 20 and the temperature sensor 18 of the temperature limiter are arranged, which also contain dark radiators, so that these are among the light radiators and the Run the temperature sensor through, but thereby reduce the overall height.
  • the light emitter 20a formed as a meandering strip or wire made of a resistance material based on molybdenum disilicit, which is arranged in the basic form of a ring-shaped bright 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 center tap is preceded by the light radiator 20a, 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 is.
  • 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 switch 37 is saddled, 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 supply 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 that 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 an appropriate setting via the setting shaft 42 and is not opened even when the bimetal 44 is heated by the control heater 45.
  • 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 are connected, which on the other hand are connected to the light radiator 22 a via the center tap 33.
  • the two conventional heating resistors 34, 35 are therefore connected in parallel to one another, but together in series with the light radiator 20 a has in the cold State has a very low resistance, so that the heating resistors 34, 35 serve as series resistors and keep the inrush current low.
  • the heating resistors 34, 35 serve as series resistors and keep the inrush current low.
  • 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.
  • FIG. 12 shows a circuit in which the radiant heater 11 has a bright radiator 20 and a dark radiator 25. Both are connected to the mains pole 51 on one side via the temperature limiter 17 and the switch of the power control device 40, which is similar to that according to FIG.
  • the other connection of the light emitter 20 is connected to a contact 36a of a front switch 37a, which is similar in arrangement and actuation to the front switch 37 according to FIG. 11, but which only requires a switch contact 47a which is connected to the mains pole 48 and the other side of the dark radiator 25 is.
  • the light emitter 20 in the parboiling stage, ie with the power regulator 40 switched to continuous operation, the light emitter 20 is switched on in parallel with the conventional heating resistor 25 and both are monitored together by the temperature limiter 17.
  • the contact 47a and the radiant tube 25 opens is clocked only on the power control unit.
  • the circuit in the auxiliary switch 37a is made such that the mains pole 48 switches from the contact 36a to a contact 38a and thereby either only the light emitter 20 or the dark emitter 25 to the network, where the clocking, ie the partial power, is only provided by the dark radiator 25.
  • the light emitter is therefore only switched on in full or parboiling or roasting mode and the partial power is provided by dark emitters. As a result, the light source with its high inrush current need not be clocked, which could otherwise confuse the operator.
  • the embodiment according to FIG. 13 has the same power control device 40 with attachment switch 37a as in FIG.
  • the dark radiator 25 is divided in the radiant heater into two partial resistors 34, 35, one of which is connected between the mains pole 48 and the branch 50 coming from the mains pole 51 via the power clock switch 43 and temperature limiter 17, while the other is connected between the mains pole 48 and the Light emitter 20 is switched on, but between which a connecting line leads to contact 36a.
  • the full power position contact 47a closed
  • the light emitter 20 and the heating resistor part 34 are operated in parallel
  • the partial power position (contact 47a open) the light emitter 20 is connected upstream of the partial resistor 35, so that the light spotlight is synchronized in its output and in the light effect.
  • this protects the light emitter and is less burdened by the clocking, and on the other hand dampens the confusing light effect.
  • FIG. 14 also has the same power control device 40 with attachment switch 37a and the radiant heater 11 has only one bright radiator 20 (or several bright radiators connected in parallel or in series, which are however connected together) and one dark radiator 25, for which the same applies. They are switched so that they are in series when the contact 47a is open and the clock switch 43 and the temperature limiter 17 are closed, so that the dark radiator 25 serves as a series resistor for the light radiator 20.
  • This is the partial power level in which, as in FIG. 13, the light emitter is damped in terms of power and light effect, while when the contact 47a is closed, i. for parboiling in the full power level, the light heater 20 is operated at full power alone.
  • the same control element consisting of power control device 40 and auxiliary switch 37a can be used for the most varied of circuits, so that not only different light and dark emitter combinations but also other cooking devices can be used with the same control device , for example cast hot plates or conventional radiant heaters can be operated with a parboiler.
  • This is significant because of the compatibility of different cooking device variants and the possibility of a modular system between control devices and hot plates. In most variants, only three connections between the control device and the hotplate 11 are necessary and a radiant heater is used, which only has to provide part of the power as a light source,
  • FIGS. 16 and 17 show two rows of a radiant heater design, each with four heating resistors and switched by a known seven-cycle switch, not shown, which is connected to the radiant heater via four connecting lines.
  • the letters a to f for the individual partial figures denote the switching stages from full power (a) to the lowest partial power (f).
  • the design power of each heating resistor in watts is given in the partial figure a and the total power resulting from the circuit next to the figure. This is expressly referred to.
  • the heating resistors that are in operation are identified by hatching, the hatching width indicating that they are operated at a lower output by series connection.
  • only one dark radiator 25 and three bright radiators 20 are provided. With full power (a), all are operated in parallel, while in stages b, c and d only three, two or one light source with its design power is in operation. At stage e, two light sources connected in parallel are connected in series with a light source, while in the lowest position f of this circuit e, the dark source 25 is also connected in series is.
  • the advantage here is that at least one light emitter is in operation in all positions and the operator can read the power level from the configuration and light intensity.
  • a conventional seven-stroke switch can be used, as it is commercially available for other hot plates.
  • Figure 17 uses the same seven-stroke switch in the same switching stages, which can also be seen from the connection ends shown filled. The difference is that only two light emitters 20 and two partial resistors 34, 35 are used for the dark emitter 25. In addition, a diode 55 is provided, which is bridged by a switch 56 in the positions a to e.
  • This circuit operates according to FIG. 16 with the difference that in the power stage d none of the light emitters, but only the conventional heating resistor 34 is switched on. Compared to FIG. 16, only one of the light emitters 20 has to be replaced by the resistor 34. In the lowest position f, the switch 56 is opened and the diode 55 halves the power again, so that the lowest level with 93 watts is only about 5 percent of the total installed power and a warming level is thus possible.
  • a configuration can also be created in the configuration according to FIG. 17 with five independently switchable connections, in which the diode becomes superfluous because then by connecting all four emitters in series, a very low output can be generated. That would be there too “dark” position d is eliminated.
  • 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. 18 and 19 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 pressed by a resilient locking mechanism 61 and a compression spring 62 contained therein to the underside of a section 63 of a heat transfer element 64 consisting of sheet metal and projecting beyond the radiator edge 22.
  • a clip 65 which consists of bent sheet metal tabs on the top Plugged into the edge of the sheet metal shell 12 and protrudes between the edge 22 and the underside of the cooking surface 15 into the heated area 23, which it partially covers in a lenticular area 66 adjacent to the edge.
  • 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 room parallel to the controller housing and is heated by a control heater 73.
  • a double snap switch 72 (or two parallel snap switches) are actuated by the expansion socket under the simultaneous influence of an adjusting screw 74.
  • An attachment switch unit 75 which is mechanically saddled onto the temperature controller 69 and is penetrated and actuated by the setting shaft 74, contains a mechanical additional switch 76, which is only closed when the highest control temperature is set or in the area thereof. It switches on the two light emitters 20, which are then switched on and off by a contact 77 in a temperature-controlled manner, as are the Dunk.el radiators 25 which are not influenced by the additional switch 76.
  • the second contact 78 of the temperature controller switches on the control heating, and only at a temperature value that is close to, but below the control temperature, but always only together with the dark radiator.
  • the result is a clocking temperature controller, the clocking of which, however, is switched off during the heating-up phase and is only switched on automatically by the expansion element 70 in the range of the target temperature, namely shortly before this temperature is reached.
  • the heating therefore takes place as quickly as in the case of a non-clocked temperature controller, the present temperature controller, however, permitting considerably smaller deviations from the target temperature during operation due to its clocking.
  • the controller is therefore particularly suitable for glass ceramic plates and especially in connection with the temperature sensor attachment described.
  • the temperature limiter 17 is connected in the example shown in the common supply line of all radiators and can therefore turn it off altogether.
  • the previously described temperature sensor arrangement and the arrangement of the light emitters explained below can be used advantageously not only with radiant heaters with a combination of light and dark radiators, but also with radiant heaters containing only light emitters.
  • FIGS. 21 to 23 show a radiant heater 11 which is arranged below a cooking surface 15 made of glass ceramic. It heats the cooking surface 15 from below and thus forms a hotplate on which cooking vessels can be heated.
  • the radiant heater 11 contains an insulating support 24 which is bowl-shaped and lies in a sheet metal shell 12.
  • an insulating support 24 which consists of a highly heat-resistant and relatively good insulating material
  • a cover 114 in the form of a ring made of a material that is denser and stronger than the insulating support 24, but also high-temperature-resistant and insulating, which has its inner edge 81 over the inner edge 80 of the edge 22 protrudes somewhat inwards.
  • the upper face of the cover panel lies on the underside of the cooking surface 15 and is usually pressed against it by a spring force acting on the sheet metal shell 12.
  • 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 1500 K (approx. 1200 ° 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 there are 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, which can be used up to temperatures of approx. 1500 K (1200 ° 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 secured by partial embedding in the material of the insulating support, for example in accordance with DE-PS 27 29 929.
  • the insulating support at a distance from the light radiator 20 can have the shape of a flat, arc-shaped groove 85 in order to achieve a targeted reflection of the radiation.
  • the light emitters and dark emitters are switched on in parallel, in series or individually using selector switches, power or temperature controls or controls, the light emitters being switched on in particular in the parboiling range or in the higher power range, because there they are most likely to show off their advantages of the relatively low-inertia rapid heating can.
  • edge recesses 86 which are adapted to the shape of the light emitter tube and narrow towards an outer opening 87 which are designed to receive the flattened connection end 84 of the light emitter.
  • This flattened end is vertical therein, so that the light radiator is guided in the transverse and longitudinal directions in the edge recess 86, 87.
  • the edge recess is provided in FIGS. 21 to 23 in the edge 22 and is open at the top.
  • the cover panel 81 covers the opening of the edge recess and thus shields it from above so that it is not visible from above.
  • the end section, and in particular the flattened section 84 is covered with a light-absorbing or reflecting layer 89, which in particular also covers the end faces 91 of the section 84.
  • This layer could, for example, reflect inwards and outwards black for the radiation affected here and possibly consist of two layers arranged one above the other, for example a vapor-deposited metal layer and a layer of a highly heat-resistant lacquer applied above, as is also used for coloring hotplates finds.
  • At least the area that protrudes from the outer opening 87 into the space 88 should be covered with the layer 89, but other areas of the end section 90 can also be coated in order to protect the area of the edge recess 86, 87 from direct radiation as far as possible.
  • the Temperature in section 84 can be lowered, which is very desirable because a critical point of halogen spotlights is the temperature at the pinch point through which the connector 21 is led to the outside. If this temperature rises too high, the tightness of the lamp could be jeopardized by oxidation processes at the lead-through point.
  • the 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 to the central plane of the light spotlights.
  • this parting plane can also be set further up or preferably down with respect to the light beam 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 important, for example, if the light emitter itself has a reflective layer on it Has the outside or inside of its piston 82. It is also advantageous above all that the arrangement according to the invention involves expensive end bases can be avoided. Because of the radiation conditions from the light emitter end sections 90, the edge 93 of the cover 92 is particularly important because it retains the majority of the unwanted radiation. It would also be possible to form the cover from the material of the insulating support 24, if one provides for a corresponding compression and opacity with adequate ventilation of the end.
  • cover parts on the ring and insulating support which, for example, are so different in the size of their edge that they overlap in height, but leave a sufficient gap between them for ventilation. This would form a labyrinth-like cover that practically does not let light escape.
  • a cover of the basic shape of the cover 92 shown in FIG. 25 could be provided on the insulating support, while the cover provided on the cover panel 114a is made larger, in particular with its edge, and overlaps the cover provided underneath.

Landscapes

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

Applications Claiming Priority (4)

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

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP88100897.3 Division-Into 1985-09-18
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

Publications (2)

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

Family

ID=25824987

Family Applications (2)

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

Family Applications 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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DE3812490A1 (de) * 1988-04-15 1989-11-02 Ego Elektro Blanc & Fischer Strahlheizkoerper
DE3826669A1 (de) * 1988-08-05 1990-02-08 Ego Elektro Blanc & Fischer Elektrischer strahler und verfahren zu seiner herstellung
DE3904177A1 (de) * 1989-02-11 1990-08-16 Ego Elektro Blanc & Fischer Elektrischer strahlheizkoerper
EP0300548B1 (fr) * 1987-07-11 1993-08-25 Bauknecht Hausgeräte GmbH Elément chauffant radiant pour cuisinières
EP0671863A3 (fr) * 1994-03-09 1996-02-14 Ceramaspeed Ltd Elément de chauffage électrique royannant.
EP0774881A3 (fr) * 1995-11-15 1997-12-10 Ceramaspeed Limited Dispositif de chauffage à infra-rouge
GB2336985A (en) * 1998-04-30 1999-11-03 Ceramaspeed Ltd A radiant electric heater having both a lamp-form heating element and a ribbon heating element
EP1534048A2 (fr) * 2003-11-19 2005-05-25 E.G.O. Elektro-Gerätebau GmbH Dispositif de chauffage, en particulier chauffage radiant par halogène.
DE102007045612A1 (de) 2007-09-18 2009-04-16 E.G.O. Elektro-Gerätebau GmbH Backofen und Verfahren zum Betrieb eines solchen Backofens
AT16211U1 (de) * 2018-04-27 2019-03-15 Ahrer Edmund Infrarotstrahler und Infrarotkabine mit Infrarotstrahler

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Publication number Priority date Publication date Assignee Title
EP0300548B1 (fr) * 1987-07-11 1993-08-25 Bauknecht Hausgeräte GmbH Elément chauffant radiant pour cuisinières
DE3812490A1 (de) * 1988-04-15 1989-11-02 Ego Elektro Blanc & Fischer Strahlheizkoerper
DE3826669A1 (de) * 1988-08-05 1990-02-08 Ego Elektro Blanc & Fischer Elektrischer strahler und verfahren zu seiner herstellung
DE3904177A1 (de) * 1989-02-11 1990-08-16 Ego Elektro Blanc & Fischer Elektrischer strahlheizkoerper
EP0671863A3 (fr) * 1994-03-09 1996-02-14 Ceramaspeed Ltd Elément de chauffage électrique royannant.
EP0774881A3 (fr) * 1995-11-15 1997-12-10 Ceramaspeed Limited Dispositif de chauffage à infra-rouge
GB2336985A (en) * 1998-04-30 1999-11-03 Ceramaspeed Ltd A radiant electric heater having both a lamp-form heating element and a ribbon heating element
EP1534048A2 (fr) * 2003-11-19 2005-05-25 E.G.O. Elektro-Gerätebau GmbH Dispositif de chauffage, en particulier chauffage radiant par halogène.
EP1534048A3 (fr) * 2003-11-19 2007-03-28 E.G.O. Elektro-Gerätebau GmbH Dispositif de chauffage, en particulier chauffage radiant par halogène.
DE102007045612A1 (de) 2007-09-18 2009-04-16 E.G.O. Elektro-Gerätebau GmbH Backofen und Verfahren zum Betrieb eines solchen Backofens
DE102007045612B4 (de) * 2007-09-18 2013-10-17 E.G.O. Elektro-Gerätebau GmbH Backofen und Verfahren zum Betrieb eines solchen Backofens
AT16211U1 (de) * 2018-04-27 2019-03-15 Ahrer Edmund Infrarotstrahler und Infrarotkabine mit Infrarotstrahler

Also Published As

Publication number Publication date
AU4764185A (en) 1986-03-27
AU584356B2 (en) 1989-05-25
JPS6180788A (ja) 1986-04-24
US4808798A (en) 1989-02-28
JPH081826B2 (ja) 1996-01-10
ES547144A0 (es) 1986-11-16
EP0176027B1 (fr) 1989-02-01
EP0176063A1 (fr) 1986-04-02
ES8701360A1 (es) 1986-11-16
YU148385A (en) 1988-02-29
EP0176063B1 (fr) 1990-05-30
US4700051A (en) 1987-10-13

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