EP0250880A2 - Radiant heating element - Google Patents

Radiant heating element Download PDF

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Publication number
EP0250880A2
EP0250880A2 EP87107772A EP87107772A EP0250880A2 EP 0250880 A2 EP0250880 A2 EP 0250880A2 EP 87107772 A EP87107772 A EP 87107772A EP 87107772 A EP87107772 A EP 87107772A EP 0250880 A2 EP0250880 A2 EP 0250880A2
Authority
EP
European Patent Office
Prior art keywords
heating
radiant heater
radiant
edge
carrier
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
EP87107772A
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German (de)
French (fr)
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EP0250880B1 (en
EP0250880B2 (en
EP0250880A3 (en
Inventor
Gerhard Dipl.-Ing. Gössler
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
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Application filed by EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Priority to AT87107772T priority Critical patent/ATE69495T1/en
Publication of EP0250880A2 publication Critical patent/EP0250880A2/en
Publication of EP0250880A3 publication Critical patent/EP0250880A3/en
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/748—Resistive heating elements, i.e. heating elements exposed to the air, e.g. coil wire heater
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—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
    • H05B3/746—Protection, e.g. overheat cutoff, hot plate indicator
    • 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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/04—Heating plates with overheat protection means
    • 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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/07—Heating plates with temperature control means

Definitions

  • the invention relates to a radiant heater for heating a heating plate, in particular a glass ceramic heating plate with at least one hotplate, with a support for an electric radiant heater comprising at least one radiant heating resistor, such as a heating coil, which is defined by an annular periphery of a heating field, which defines a fixed heating field size a central zone extends into an inner zone of the heating field.
  • a radiant heating resistor such as a heating coil
  • radiant heat in the visible wave range is emitted as quickly as possible, so that the cook can quickly recognize the operational readiness or the operating state of the hotplate from the visible glow of the associated radiant heater, and thus as far as possible quickly a high beam power density or heat output is available.
  • the invention has for its object to provide a radiant heater of the type described, in which the time from switching on until a visible glow and thus also the parboiling time compared to previously known radiant heaters, which in particular have at least one exposed heating resistor, can be significantly reduced.
  • a radiant heater of the type described at the outset according to the invention in that an area of the radiant heater belonging to a partial output forms the periphery of the heating field and as edge heating at least over a part of the heating phase with at least one additional partial output compared with it associated area of the radiant heater of increased beam power density is provided.
  • the boil-off edge heating is not switched off at the end of the boil-up phase, but is possibly reduced to a smaller difference in its jet power density compared to the area of the jet heater located within it.
  • a variable parboil circuit is created which, during the parboil phase, at least temporarily results in faster heat development in the edge area of the radiant heater, i.e.
  • the increased power difference during the heating phase can also be used for the fact that the so operated Edge heating glows visibly in a very short time after switching on the hotplate and thus visually indicates the full operational readiness of this hotplate.
  • the described heat emission behavior of the parboiler heating which is continued to be operated during the boiling phase, can e.g. can be achieved in a simple manner in that the parboiling edge heating is provided or switched over the entire parboiling phase with relatively increased power.
  • a particularly simple switchover from the parboiling phase to the continued boiling phase can be achieved, for example, by switching a partial output of the jet heater essentially as a function of time, preferably via a temperature switch with a high switching temperature difference or hysteresis.
  • This temperature switch only switches off at a relatively high temperature influencing its temperature sensor and only at a relatively low temperature which the radiant heater usually cannot achieve during continued cooking, but only by switching it off completely and after corresponding cooling.
  • this behavioral characteristic of the temperature switch can also be achieved in that the heat coupling of the temperature sensor of the temperature switch to the radiant heater or the radiant heater is chosen to be very low such that the temperature sensor is only heated when the end of the parboiling phase is reached the switch-off temperature is heated and then can no longer cool down to its switch-on temperature due to low heat dissipation through appropriate insulation during continued cooking. This results in a time-dependent influencing of the parboiling phase using switching elements that respond exclusively to temperature influences.
  • a particularly simple embodiment of the subject matter of the invention is that at least a predetermined part of the jet heater, that is to say at least one heating resistor, is practically switched off by short-circuiting during the boiling phase.
  • a significant increase in the output in the outer region of the heating field can be achieved without any particular effort, this solution being suitable even for the simplest radiant heaters which have only a single radiant heating resistor, that is to say only a single electrical heating circuit.
  • At least one such inner part can be formed by a radiant heating resistor with a high positive temperature coefficient (PTC), in which case the device influencing the transition from the boiling phase to the continued cooking phase is exclusively by the Associated radiant heating resistor itself can be formed because the PTC resistor causes the desired reversal due to its characteristic behavior.
  • PTC positive temperature coefficient
  • parboiling edge heating is provided by a separate, in particular single-line heating circuit which extends over a maximum of 360 °, possibly bifilar, that is to say double-return heating circuit is formed, which is preferably always connected in parallel to the inner part of the jet heater. Because of its arrangement on the periphery of the heating field, this heating conductor can be subjected to a much higher load than the heating coil lying within it, for example taking up the remaining part of the heating field, which means that this area of the heating field is visible much faster and is shorter Cooking time can be reached.
  • the parboiler control device can also be formed exclusively by the heat-conducting connection between the jet heater and the carrier, without using a separate control or regulating device, since only the characteristics of this heat-conducting connection are used to end the parboiling phase.
  • a particularly low specific thermal connection between the edge heating and the support can e.g. can be achieved in that longitudinal sections of the associated heating resistor are arranged essentially freely floating in a contact-free manner with respect to the carrier, that is to say they run in a contact-free or tensioned manner between suspension sections in the manner of suspension bridge sections.
  • the longitudinal sections of the heating resistor which have a low thermal coupling to the support, can also be there by created that they are in areas of the carrier which have different thermal conductivity from the material and are formed, for example, by a thermal insulation or insulation material, which is unsuitable for the immediate mounting of the heating resistor, but has very good insulation properties.
  • Such an insulation material is used in radiant heaters, for example, as underbedding of a cup-shaped or disk-shaped insulation support body, which has lower thermal insulation values, but is suitable for the reliable determination of the heating resistance by direct embedding.
  • the relatively dimensionally stable insulation support body can be provided with openings in the area of the mentioned longitudinal sections of the heating resistor, in which upward projections of the underbedding expediently protrude such that these projections essentially completely fill the openings, at least in plan view, these projections can be set back at least partially in the vertical direction in relation to the front side associated with the heating resistors and / or can be set at least partially in front of it.
  • the insulation support body can, for example, be a relatively solid molded body made of mineral fibers, made of a material such as e.g. is known under the trade name "Fiberfrax", while the underbedding is based on pyrogenic silica.
  • the parboil control device expediently has a temperature sensor actuating the associated switch, which is preferably countered by an insulation layer is thermally insulated above the jet heater, which can be achieved in a simple manner without special additional insulation measures in that the temperature sensor is embedded in the already existing insulation material of the carrier, that is to say on the side of the jet heating resistor facing away from the heating plate. If the temperature sensor is designed as an expansion rod sensor, it can be embedded in the insulation carrier in a simple manner simply by inserting it into the insulation carrier, and its switching head can be located outside the carrier.
  • This switch which operates in the manner of a temperature protection switch, can also be formed by a so-called Klixon thermostat, which interacts with a heat conducting rod, which transfers the heat from the sensing point to the temperature sensor in the switching head of the thermostat, for example formed by a bimetal sensor.
  • a radiant heater 1 according to the invention, which is intended to be arranged on the underside of a translucent heating plate 2 made of glass ceramic or the like, has a shell-shaped or cup-shaped support 4.
  • the carrier 4 consists essentially of a one-part or multi-part inner shell 5 made of at least one insulation material and a relatively thin-walled outer shell 6, which serves to protect and mount the inner shell 5, which preferably consists of sheet steel.
  • the inner shell 5 carries on its substantially flat or parallel to the heating plate 2 floor a radiant heater 7 to be operated by electrical current in the form of at least one encapsulated heating resistor 8, but it is conceivable that at least part of the power of the radiant heater 1 also with a encapsulated radiant heater, i.e. a bulb lamp, such as a halogen lamp, can be operated.
  • the radiant heater has only unencapsulated heating resistors.
  • the heating resistor 8 is laid in a double spiral approximately in such a way about the central axis of the radiant heater 1 that its two connection ends 14 on the periphery of the essence Lichen heating field 1O delimited by the outermost, almost annularly closed spiral turn.
  • a predetermined number of outer turns of the heating resistor 8, namely about half of all turns or about three spiral turns in the exemplary embodiment shown, are provided as parboiling edge heating 9 for operation with a relatively increased beam power density during the parboiling phase, while the rest are within this marginal heating 9 lying turns of the same heating resistor form a residual partial power 11, which can be operated in a variable power gradient compared to the edge heating 9.
  • the entire jet heater 7, that is to say the only heating resistor 8 forming this, is operated during the entire heating operation by means of an adjustable control device or, for example, a clocking power control device, with the jet heater 7 being connected to the mains current in between.
  • an adjustable control device or, for example, a clocking power control device for example, a clocking power control device
  • the jet heater 7 being connected to the mains current in between.
  • An additional control device 13 is provided for the different operation of the jet heater 7 in the parboiling phase, on the one hand, and in the boiling phase, on the other hand, whose temperature sensor 17 is exposed to the temperature inside or in the full cross section of the inner shell 5.
  • the temperature sensor 17, which is an expansion rod sensor with an outer tube and an inner rod arranged therein with different offs expansion coefficient or a heat-conducting rod, which supplies the heat from the sensing point to the switching head of the control device 13 located below the switching head of the temperature limiter 15 on the outside of the carrier 4, is also parallel to the heating plate 2, but below the bottom surface of the inner shell receiving the jet heater 7 5 and above the underside, i.e.
  • this temperature sensor 17 being shorter than half the width of the heating field 10 can be such that it lies only on one side of its central axis essentially exclusively in the area of the associated turns of the edge heating 9.
  • a cut-off switch 18 Arranged in the switch head of the control device 13 designed as a cut-off switch 18 in the form of, for example, a snap switch, which is not directly connected to the power supply for the radiant heater 7, is arranged in a short-circuit circuit of a short-circuit for the partial power 11, that is to say only via its two connecting poles two spaced apart locations of the heating resistor 8 so that they are electrically connected so that when the parboiler 11 is closed, the longitudinal section of the heating resistor 8 belonging to the partial power 11 and occupying the inner zone of the heating field 10 is essentially taken out of operation by short-circuiting.
  • the residual heating associated with the parboil edge heating and essentially extending to the periphery of the heating field 10 is operated with the longitudinal section of the heating resistor 8 during the closed short-circuit circuit 19 with a relatively substantially increased beam power density and, after being switched on, heated up very quickly so that by the Heating plate 2 a visible glow can be taken.
  • the heating switch 18 opens, so that now also the longitudinal section of the heating resistor 8 belonging to the partial power 11 goes into full power operation and thus the difference in the jet power density between the area of the heating edge heating 9 and that of the partial power 11 is at least reduced.
  • increased power should be available for as long as possible during the boil-up without switching back to the increased power again during continued cooking and after the temperature monitor forming the control device 13 has responded.
  • the shortening of the boil-up time to be achieved by the design according to the invention also results from the fact that the cooking vessel base 3 of cooking vessels is usually curved in such a way that the cooking vessel base 3 has the most direct contact with the heating plate 2 in the region of its outer edge and therefore there is a particular one faster heat transfer is possible.
  • arrows, the length of which represent the beam power density indicate that an operating arrangement is provided in the subject matter of the invention in such a way that the power density is greatest in this edge region in the boiling phase. In the continued cooking phase, either this external power density in the edge area 9 can be reduced, the power density in the area of the partial power 11 can be increased, or both processes can be carried out simultaneously.
  • the switching hysteresis of the control device 13 is chosen so large that it is almost full before constant cooling of the radiant heater 1 no longer switches back to the short-circuit position, that is to say in the closed position of the parboiler switch 18.
  • this longitudinal section can also be formed by a heating conductor with a high positive temperature coefficient, which consists, for example, of molybdenum disilicide.
  • a heating conductor with a high positive temperature coefficient which consists, for example, of molybdenum disilicide.
  • the carrier 4 is stretched with the end face of the edge of the shell of the inner shell 5 under pressure over the entire surface against the inside or underside of the heating plate, so that the inner circumference of this contact edge essentially coincides with the periphery or outer boundary of the heating field 10.
  • the heating resistor 8 can be immovably fixed to the inner shell 5 by at least partially embedding its coils in the insulating material.
  • the radiant heater can also have a circular, rectangular or square shape, deviating from the circular shape, the heating resistor then expediently following this outer contour in its spiral shape.
  • the radiant heater 1 a has as the parboiling edge heater 9 a one in only one operation, i.e. only in a single-strand loop or bifilar external heating resistor made of particularly thin, heavy-duty resistance wire, i.e. of a resistance wire that is thinner and is more resilient than the heating resistor belonging to the partial power 11a.
  • the radiant heater of this radiant heater 1a is therefore basically of two circuits, but the two heating circuits are connected in parallel or in series, which is why they are always switched on and off simultaneously.
  • the inner shell 5a consists of two superimposed support bodies 2O, 21 of different insulating materials and thicknesses, the lower, plate-shaped support body 2O consisting of a powdery pressed mass, being relatively pressure-elastic, a greater thickness than the molded body 21 lying thereon over the entire surface has and above all has a thermal insulation value which is significantly higher than that of the support body 21.
  • the disk-shaped support body 21, for example is a relatively dimensionally stable molded body made of pressed mineral fibers, on which the heating resistors are held by embedding in places.
  • This support body 21 has on the upper side upwards about its remaining thickness, approximately radial to the central axis of the radiant heater 1 a and integrally formed with the rest of the support body 21 webs.
  • the webs lying only in the radially outer region of the heating field are each formed between depressions 23, which extend only from the periphery of the heating field part of the turns of the heating resistors are sufficient.
  • the windings lying radially inside the depressions 23, that is to say in the central region, are therefore in direct contact with the inner shell 5a.
  • these turns are held by embedding exclusively on the webs 22, while according to FIG.
  • the distance of the longitudinal sections of the heating resistors bridging the depressions parallel to their bottom surfaces from these bottom surfaces can be smaller than the outside diameter of these heating resistors, in particular about half as large, while the heating resistors are embedded in the webs 22 by about half their outside diameter.
  • the distance between adjacent webs can be approximately twice their width.
  • the upper support body 21b instead of the recesses 23 there can also be openings or openings 23b which are continuous over the thickness of the support body 21b and which are at least partially filled by projections 24 of the lower support body 2Ob.
  • the projections 24 extend slightly above the upper sides of the webs 22b, but are provided with channel-shaped receiving grooves 25 in the region of each longitudinal section crossing them, the bottom surfaces of which can be slightly lower than the upper side of the webs 21b.
  • the depth of the receiving grooves 25, against which the associated longitudinal sections of the heating resistors can be provided in a contact-free manner or only loosely lying against the embedded surface is expediently so large that the adjacent opening grooves 25 separating webs of the support body 21b extend only approximately to the middle of the outer diameter of these longitudinal sections.
  • the heat dissipation from the above-mentioned longitudinal sections of the radiant heaters lying between the webs 21b into the inner shell 5b is particularly low, so that these longitudinal sections very quickly come to a visible glow after being switched on from the cold state.
  • the fact that the support body 20b is thickened by the projections 24 at least in a few, grid-like zones beyond the underside of the support body 21b results in excellent additional thermal insulation. But it could also be.
  • control device 13 can be designed similarly to that according to DE-OS 32 47 O28 or that according to EP-A-O1 14 3O7, to which reference is made for further details.
  • the parboiler heating is in the same space as that of the rest of the jet heater 7, which is enclosed by the carrier 4 and the heating plate 2, and is not separated from it in a ring shape by an intermediate web of the carrier.
  • the invention results in a higher specific power in the outdoor area, which may be as high as it could not be expected from the heating resistor and / or the glass ceramic plate in continuous operation. Due to its mostly temporary effect and the higher power consumption in this area, especially during the parboiling phase, it does not trigger any harmful effects.
  • a higher specific power could also be provided outdoors. It mainly affects during the boil-up time, as the outer heating conductor glows faster, so that the desired optical effects are triggered and earlier with the Heat transfer to the cooking vessel begins. During the continued cooking phase, this power distribution, which is advantageously maintained without switching, hardly plays out, at least not negatively, because the total power is then reduced, for example, by switching the total power on and off cyclically. It has been shown that a higher specific load on the edge area and in particular on the outer heating conductor winding does not play an important role in their service life, since these do not burn out even with some overload.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Resistance Heating (AREA)
  • Control Of Resistance Heating (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Power Steering Mechanism (AREA)

Abstract

Bei einem Strahlheizkörper (1) zur Beheizung durch eine Heizplatte (2) ist die Peripherie des Heizfeldes durch eine Ankoch-Randbeheizung (9) gebildet, die beispielsweise durch eine Kurzschlußschaltung (19) der innerhalb ihr liegenden Teilleistung (11) während der Ankochphase gegenüber dieser Teilleistung (11) mit relativ höherer Strahl-Leistungsdichte betrieben wird, so daß sie vom kalten Zustand wesentlich schneller in den sichtbaren Glühbereich kommt und außerdem im Randbereich der dort gegebene schnellere Wärmetransport zum Kochgefäßboden (3) genutzt wird. Die erhöhte Strahl-Leistungsdichte kann auch durch andere Maßnahmen, nämlich durch veränderte Isolationsverhältnisse im Bereich der Randbeheizung, durch Verwendung eines PTC-Widerstandes im Bereich der inneren Teilleistung und durch ähnliche Maßnahmen erzielt werden.In the case of a radiant heater (1) for heating by a heating plate (2), the periphery of the heating field is formed by an edge heating (9) which, for example, by means of a short circuit (19) of the partial power (11) within it during the heating phase compared to the latter Partial power (11) is operated with a relatively higher beam power density, so that it comes from the cold state into the visible annealing area much more quickly and, moreover, the faster heat transfer to the cooking vessel base (3) is used in the edge area. The increased beam power density can also be achieved by other measures, namely by changing insulation conditions in the area of the edge heating, by using a PTC resistor in the area of the internal partial power and by similar measures.

Description

Die Erfindung betrifft einen Strahlheizkörper zur Beheizung einer Heizplatte, insbesondere eine Glas­keramik-Heizplatte mit mindestens einer Kochstelle, mit einem Träger für einen elektrischen Strahlhei­zer aus mindestens einem Strahlheizwiderstand, wie einer Heizwendel, der sich von einer ringförmigen, eine feste Heizfeldgröße bestimmenden Peripherie eines Heizfeldes über eine Mittelzone bis in eine Innenzone des Heizfeldes erstreckt.The invention relates to a radiant heater for heating a heating plate, in particular a glass ceramic heating plate with at least one hotplate, with a support for an electric radiant heater comprising at least one radiant heating resistor, such as a heating coil, which is defined by an annular periphery of a heating field, which defines a fixed heating field size a central zone extends into an inner zone of the heating field.

Bei zahlreichen Kochprozessen ist es erwünscht, eine möglichst kurze Ankochzeit zu erreichen, d.h. am Anfang des Kochprozesses das Kochgut während möglichst kurzer Zeit schonend auf ein vorbestimmtes Temperaturniveau anzuheizen, wonach bei zurückgefahrener Leistung und geregelt über einen Temperaturschalter oder gesteuert über ein Leistungssteuergerät fortgekocht wird, ohne daß hierfür eine gesonderte Betätigung des elektri­schen Betätigungsorganes für die Kochstelle erforderlich sein soll. Diese automatische Beeinflussung der Wärmeab­gabe der Kochstelle ist dabei so erwünscht, daß sie nach dem einmaligen Übergang vom Zustand der Ankochphase in die Fortkochphase nicht mehr von selbst in den Zustand der An­kochphase zurückkehrt, es sei denn, sie ist ganz abgeschal­tet worden und durch entsprechende Abkühlung wieder für die Durchführung einer nächsten Ankochphase bereitgestellt.With numerous cooking processes, it is desirable to achieve a cooking time that is as short as possible, that is, at the beginning of the cooking process, the food to be cooked gently for a predetermined time To heat the temperature level, after which, when the power is reduced and controlled by means of a temperature switch or controlled by a power control device, the cooking is continued, without this requiring a separate actuation of the electrical actuating element for the hotplate. This automatic influencing of the heat output of the hotplate is so desirable that it does not automatically return to the state of the boiling phase after the one-time transition from the state of the boiling phase to the continued boiling phase, unless it has been switched off completely and by appropriate cooling again provided for the implementation of a next parboiling phase.

Bei Strahlheizkörpern ist es darüber hinaus erwünscht, daß nach dem Einschalten einer Kochstelle nach möglichst kur­zer Zeit Strahlungswärme im sichtbaren Wellenbereich abge­geben wird, damit die kochende Person möglichst schnell an­hand des sichtbaren Glühens des zugehörigen Strahlheizers die Betriebsbereitschaft bzw. den Betriebszustand der Koch­stelle erkennt und damit möglichst schnell eine hohe Strahl-­Leistungsdichte bzw Wärmeleistung zur Verfügung steht.In the case of radiant heaters, it is also desirable that after switching on a hotplate, radiant heat in the visible wave range is emitted as quickly as possible, so that the cook can quickly recognize the operational readiness or the operating state of the hotplate from the visible glow of the associated radiant heater, and thus as far as possible quickly a high beam power density or heat output is available.

Es wurde bereits versucht, dieses thermische und optische Verhalten eines Strahlheizkörpers dadurch zu erreichen, daß an der Peripherie des Heizfeldes ein gesonderter Strahl­heizwiderstand vorgesehen ist, der während der Ankoch- bzw. Anheizphase zugeschaltet wird und nach der Ankochphase ab­geschaltet bleibt. Einen solchen äußeren, gesondert zu­schaltbaren Heizwiderstand gibt es auch für solche Kochstel­len, welche zwischen zwei festen Heizfeldgrößen umschaltbar sind, um sie wahlweise auf Kochgefäße unterschiedlicher Grundriß-Größe umschalten zu können. Mit solchen Anordnungen können zwar zum Teil recht gute Ergebnisse erzielt werden, jedoch führt das Abschalten des während der Ankochphase zu­ geschalteten Heizwiderstandes während des Fortkochens zu einer relativ ungleichmäßigen spezifischen Wärmebeauf­schlagung des Kochgefäßbodens. Außerdem werden dafür Lei­stungssteuergeräte mit Zusatzschaltern benötigt.Attempts have already been made to achieve this thermal and optical behavior of a radiant heater by providing a separate radiant heating resistor at the periphery of the heating field, which is switched on during the heating or heating phase and remains switched off after the heating phase. Such an external, separately switchable heating resistor is also available for those hotplates which can be switched between two fixed heating field sizes in order to be able to switch them to cooking vessels of different floor plan sizes. With such arrangements, quite good results can be achieved in some cases, but switching off the during the parboiling phase leads to switched heating resistor during continued cooking to a relatively uneven specific heat exposure of the bottom of the cooking vessel. Power control units with additional switches are also required for this.

Der Erfindung liegt die Aufgabe zugrunde, einen Strahl­heizkörper der beschriebenen Art zu schaffen, bei welchem die Zeit vom Einschalten bis zum Erreichen eines sicht­baren Glühens und damit auch die Ankochzeit gegenüber bis­her bekannten Strahlheizkörpern, die insbesondere minde­stens einen freiliegenden Heizwiderstand aufweisen, merk­lich verkürzt werden kann.The invention has for its object to provide a radiant heater of the type described, in which the time from switching on until a visible glow and thus also the parboiling time compared to previously known radiant heaters, which in particular have at least one exposed heating resistor, can be significantly reduced.

Diese Aufgabe wird bei einem Strahlheizkörper der eingangs beschriebenen Art gemäß der Erfindung dadurch gelöst, daß ein einer Teilleistung zugehöriger Bereich des Strahlhei­zers die Peripherie des Heizfeldes bildet und als Randbe­heizung mindestens über einen Teil der Ankochphase mit einer gegenüber einem innerhalb ihr liegenden, mindestens einer weiteren Teilleistung zugehörigen Bereich des Strahl­heizers erhöhter Strahl-Leistungsdichte vorgesehen ist. Die Ankoch-Randbeheizung wird am Ende der Ankochphase nicht ab­geschaltet, sondern ggf. auf einen geringeren Unterschied ihrer Strahl-Leistungsdichte gegenüber dem innerhalb ihr liegenden Bereich des Strahlheizers zurückgefahren. Es wird eine variable Ankoch-Schaltung geschaffen, die während der Ankochphase zumindest vorübergehend eine schnellere Wärme­entwicklung im Randbereich des Strahlheizkörpers, also dort ergibt, wo in der Regel aufgrund der üblichen Bodenform von Kochgefäßen der beste Kontakt zwischen diesem Gefäßboden und der Heizplatte gegeben ist. Der während der Ankochphase erhöhte positive Leistungsunterschied, mit welchem die Rand­beheizung gegenüber der übrigen Teilleistung gefahren wird, kann auch dafür herangezogen werden, daß die so betriebene Randbeheizung nach dem Einschalten der Kochstelle in äußerst kurzer Zeit sichtbar glüht und damit optisch die volle Be­triebsbereitschaft dieser Kochstelle anzeigt.This object is achieved in a radiant heater of the type described at the outset according to the invention in that an area of the radiant heater belonging to a partial output forms the periphery of the heating field and as edge heating at least over a part of the heating phase with at least one additional partial output compared with it associated area of the radiant heater of increased beam power density is provided. The boil-off edge heating is not switched off at the end of the boil-up phase, but is possibly reduced to a smaller difference in its jet power density compared to the area of the jet heater located within it. A variable parboil circuit is created which, during the parboil phase, at least temporarily results in faster heat development in the edge area of the radiant heater, i.e. where there is usually the best contact between this vessel bottom and the heating plate due to the usual shape of the bottom of the cooking vessel. The increased power difference during the heating phase, with which the edge heating is operated compared to the rest of the partial power, can also be used for the fact that the so operated Edge heating glows visibly in a very short time after switching on the hotplate and thus visually indicates the full operational readiness of this hotplate.

Das beschriebene Wärmeabgabe-Verhalten der Ankoch-Randbe­heizung, die gleichzeitig in der Fortkochphase weiter be­trieben wird, kann z.B. auf einfache Weise dadurch erreicht werden, daß die Ankoch-Randbeheizung im wesentlichen über die gesamte Ankochphase mit relativ erhöhter Leistung vor­gesehen bzw. geschaltet ist.The described heat emission behavior of the parboiler heating, which is continued to be operated during the boiling phase, can e.g. can be achieved in a simple manner in that the parboiling edge heating is provided or switched over the entire parboiling phase with relatively increased power.

Eine besonders einfache Umschaltung von der Ankochphase in die Fortkochphase kann z.B. dadurch erreicht werden, daß eine Teilleistung des Strahlheizers im wesentlichen zeitab­hängig, vorzugsweise über einen Temperaturschalter mit hoher Schalttemperaturdifferenz bzw. -Hysterese geschaltet wird. Dieser Temperaturschalter schaltet erst bei einer relativ hohen, seinen Temperaturfühler beeinflussenden Temperatur ab und erst bei einer relativ so niedrigen Temperatur wie­der ein, wie sie der Strahlheizkörper während des Fortko­chens üblicherweise nicht, sondern nur durch vollständiges Abschalten und nach entsprechendem Abkühlen, erreichen kann. Statt dessen oder zusätzlich hierzu kann diese Ver­haltenscharakteristik des Temperaturschalters auch dadurch erreicht werden, daß die Wärme-Ankoppelung des Temperatur­fühlers des Temperaturschalters an den Strahlheizer bzw. den Strahlheizkörper sehr gering so gewählt wird, daß der Temperaturfühler erst bei Erreichen des Endes der Ankoch­phase durch Wärmeleitung auf die Abschalttemperatur er­wärmt ist und dann infolge geringer Wärmeableitung durch entsprechende Isolierung während des Fortkochens nicht mehr auf seine Einschalttemperatur abkühlen kann. Es ergibt sich also eine zeitabhängige Beeinflussung der Ankochphase unter Verwendung ausschließlich auf Temperatureinflüsse anspre­chender Schaltorgane.A particularly simple switchover from the parboiling phase to the continued boiling phase can be achieved, for example, by switching a partial output of the jet heater essentially as a function of time, preferably via a temperature switch with a high switching temperature difference or hysteresis. This temperature switch only switches off at a relatively high temperature influencing its temperature sensor and only at a relatively low temperature which the radiant heater usually cannot achieve during continued cooking, but only by switching it off completely and after corresponding cooling. Instead of or in addition to this, this behavioral characteristic of the temperature switch can also be achieved in that the heat coupling of the temperature sensor of the temperature switch to the radiant heater or the radiant heater is chosen to be very low such that the temperature sensor is only heated when the end of the parboiling phase is reached the switch-off temperature is heated and then can no longer cool down to its switch-on temperature due to low heat dissipation through appropriate insulation during continued cooking. This results in a time-dependent influencing of the parboiling phase using switching elements that respond exclusively to temperature influences.

Eine besonders einfache Ausführungsform des Erfindungs­gegenstandes liegt darin, daß während der Ankochphase min­destens ein vorbestimmter Teil des Strahlheizers, also mindestens eines Heizwiderstandes durch Kurzschließen prak­tisch abgeschaltet wird. Dadurch kann eine wesentliche Er­höhung der Leistung im Außenbereich des Heizfeldes ohne be­sonderen Aufwand erreicht werden, wobei diese Lösung selbst für solche einfachsten Strahlheizkörper geeignet ist, welche nur einen einzigen Strahlheizwiderstand, also nur einen ein­zigen elektrischen Heizkreis aufweisen.A particularly simple embodiment of the subject matter of the invention is that at least a predetermined part of the jet heater, that is to say at least one heating resistor, is practically switched off by short-circuiting during the boiling phase. As a result, a significant increase in the output in the outer region of the heating field can be achieved without any particular effort, this solution being suitable even for the simplest radiant heaters which have only a single radiant heating resistor, that is to say only a single electrical heating circuit.

Insbesondere anstatt einer solchen Kurzschlußschaltung für mindestens einen innerhalb der Peripherie liegenden Teil des Strahlheizers kann mindestens ein solcher innerer Teil durch einen Strahlheizwiderstand mit hohem positivem Tempe­raturkoeffizienten (PTC) gebildet sein, wobei dann die den Übergang von der Ankochphase in die Fortkochphase beein­flußende Einrichtung ausschließlich durch den zugehörigen Strahlheizwiderstand selbst gebildet sein kann, da der PTC-­Widerstand aufgrund seines charakteristischen Verhaltens die gewünschte Umsteuerung bewirkt.In particular, instead of such a short circuit for at least one part of the radiant heater located within the periphery, at least one such inner part can be formed by a radiant heating resistor with a high positive temperature coefficient (PTC), in which case the device influencing the transition from the boiling phase to the continued cooking phase is exclusively by the Associated radiant heating resistor itself can be formed because the PTC resistor causes the desired reversal due to its characteristic behavior.

Eine noch weiter vereinfachte und fertigungstechnisch sehr günstige Lösung der der Erfindung zugrundeliegenden Aufgabe kann auch dadurch erreicht werden, daß die Ankoch-Randbe­heizung durch einen gesonderten, insbesondere einstrangig sich nur über höchstens 36O° erstreckenden, ggf. bifilaren, d.h. doppelt hin- und zurückgeführten Heizkreis gebildet ist, der vorzugsweise stets zum inneren Teil des Strahlheizers parallel geschaltet ist. Wegen seiner Anordnung an der Peri­pherie des Heizfeldes kann dieser Heizleiter wesentlich höher belastet werden als die innerhalb ihm liegende, bei­spielsweise den restlichen Teil des Heizfeldes einnehmende Heizwendel, wodurch ein wesentlich schnelleres sichtbares Glühen dieses Bereiches des Heizfeldes sowie eine kürzere Ankochzeit zu erreichen sind.An even more simplified and technically very economical solution to the problem on which the invention is based can also be achieved in that the parboiling edge heating is provided by a separate, in particular single-line heating circuit which extends over a maximum of 360 °, possibly bifilar, that is to say double-return heating circuit is formed, which is preferably always connected in parallel to the inner part of the jet heater. Because of its arrangement on the periphery of the heating field, this heating conductor can be subjected to a much higher load than the heating coil lying within it, for example taking up the remaining part of the heating field, which means that this area of the heating field is visible much faster and is shorter Cooking time can be reached.

Zusätzlich zu den beschriebenen Maßnahmen, aber auch statt dessen, ist eine vorteilhafte Lösung der der Erfindung zu­grundeliegenden Aufgabe dadurch zu erreichen, daß die An­koch-Randbeheizung mit geringerer Wärmeleit-Ankoppelung als der innere Teil des Strahlheizers mit dem Träger verbunden ist, so daß also die spezifische Wärmeableitung von der Rand­beheizung in den Träger wesentlich geringer als diejenige des inneren Teiles des Strahlheizers ist und daher die Rand­beheizung nach dem Einschalten wesentlich schneller zum sichtbaren Glühen kommt. Diese geringere spezifische Wärmeab­leitung kann durch verschiedene, relativ einfache Maßnahmen, beispielsweise durch eine geringere spezifische Flächenbe­rührung zwischen dem zugehörigen Heizwiderstand und dem Trä­ger, durch Verwendung eines Tragwerkstoffes mit geringerer spezifischer Wärmeleitfähigkeit im Bereich der Randbeheizung sowie durch ähnliche Maßnahmen erreicht werden. In diesem Fall kann ebenfalls ohne Verwendung einer gesonderten Steuer- oder Regeleinrichtung die Ankoch-Steuereinrichtung ausschließ­lich durch die Wärmeleitverbindung zwischen dem Strahlheizer und dem Träger gebildet sein, da zur Beendigung der Ankoch­phase ausschließlich die Charakteristika dieser Wärmeleit­verbindung herangezogen werden.In addition to the measures described, but also instead, an advantageous solution to the object on which the invention is based is achieved in that the parboiler heating is connected to the carrier with less heat-conducting coupling than the inner part of the jet heater, so that the specific heat dissipation from the edge heating in the carrier is significantly less than that of the inner part of the jet heater and therefore the edge heating comes to a visible glow much faster after switching on. This lower specific heat dissipation can be achieved by various, relatively simple measures, for example by a lower specific surface contact between the associated heating resistor and the support, by using a support material with a lower specific thermal conductivity in the area of the edge heating and by similar measures. In this case, the parboiler control device can also be formed exclusively by the heat-conducting connection between the jet heater and the carrier, without using a separate control or regulating device, since only the characteristics of this heat-conducting connection are used to end the parboiling phase.

Eine besonders geringe spezifische Wärmeleitverbindung zwi­schen der Randbeheizung und dem Träger kann z.B. dadurch er­reicht werden, daß Längsabschnitte des zugehörigen Heiz­widerstandes im wesentlichen frei schwebend berührungsfrei gegenüber dem Träger angeordnet sind, also nach Art von Hängebrücken-Abschnitten zwischen Aufhängungsabschnitten berührungsfrei bzw. gespannt verlaufen.A particularly low specific thermal connection between the edge heating and the support can e.g. can be achieved in that longitudinal sections of the associated heating resistor are arranged essentially freely floating in a contact-free manner with respect to the carrier, that is to say they run in a contact-free or tensioned manner between suspension sections in the manner of suspension bridge sections.

Die in geringer Wärmeleit-Ankoppelung zum Träger stehenden Längsabschnitte des Heizwiderstandes können aber auch da­ durch geschaffen werden, daß sie in Bereichen des Trägers liegen, die von dessen Werkstoff her unterschiedliche Wär­meleitfähigkeit aufweisen und beispielsweise durch einen Wärmedämm- bzw. Isolationswerkstoff gebildet sind, der zwar für die unmittelbare Halterung des Heizwiderstandes unge­eignet ist, jedoch sehr gute Isolationseigenschaften auf­weist.However, the longitudinal sections of the heating resistor, which have a low thermal coupling to the support, can also be there by created that they are in areas of the carrier which have different thermal conductivity from the material and are formed, for example, by a thermal insulation or insulation material, which is unsuitable for the immediate mounting of the heating resistor, but has very good insulation properties.

Ein solcher Isolationswerkstoff wird bei Strahlheizkörpern beispielsweise als Unterbettung eines napf- oder scheiben­förmigen Isolations- Tragkörpers verwendet, der zwar nie­drigere thermische Dämmwerte hat, jedoch für die sichere Festlegung des Heizwiderstandes durch unmittelbare Einbet­tung geeignet ist. In diesem Fall kann der relativ form­feste Isolations-Tragkörper im Bereich der genannten Längs­abschnitte des Heizwiderstandes mit Durchbrüchen versehen sein, in welche nach oben gerichtete Vorsprünge der Unter­bettung zweckmäßig derart ragen, daß diese Vorsprünge die Durchbrüche zumindest in Draufsicht im wesentlichen voll­ständig ausfüllen, wobei diese Vorsprünge wenigstens teil­weise in Höhenrichtung gegenüber der den Heizwiderständen zugehörigen Vorderseite zurückversetzt und/oder wenigstens teilweise demgegenüber vorversetzt sein können. Der Iso­lations-Tragkörper kann beispielsweise ein relativ fester Formkörper aus mineralischen Fasern, aus einem Werkstoff sein, wie er z.B. unter dem Handelsnamen "Fiberfrax" be­kannt ist, während die Unterbettung auf der Basis von pyro­gener Kieselsäure aufgebaut ist.Such an insulation material is used in radiant heaters, for example, as underbedding of a cup-shaped or disk-shaped insulation support body, which has lower thermal insulation values, but is suitable for the reliable determination of the heating resistance by direct embedding. In this case, the relatively dimensionally stable insulation support body can be provided with openings in the area of the mentioned longitudinal sections of the heating resistor, in which upward projections of the underbedding expediently protrude such that these projections essentially completely fill the openings, at least in plan view, these projections can be set back at least partially in the vertical direction in relation to the front side associated with the heating resistors and / or can be set at least partially in front of it. The insulation support body can, for example, be a relatively solid molded body made of mineral fibers, made of a material such as e.g. is known under the trade name "Fiberfrax", while the underbedding is based on pyrogenic silica.

Sofern zur Umschaltung von der Ankochphase zur Fortkoch­phase eine Unterbrechung eines elektrischen Kreises heran­gezogen wird, weist die Ankoch-Regeleinrichtung zweckmäßig einen den zugehörigen Schalter betätigenden Temperaturfüh­ler auf, der vorzugsweise über eine Isolationsschicht gegen­ über dem Strahlheizer wärmegedämmt ist, was ohne besondere zusätzliche Isolationsmaßnahmen auf einfache Weise dadurch erreicht werden kann, daß der Temperaturfühler in den ohne­hin vorhandenen Isolationswerkstoff des Trägers eingebettet ist, also auf der von der Heizplatte abgekehrten Seite des Strahlheizwiderstandes liegt. Ist der Temperaturfühler als Dehnstabfühler ausgebildet, so kann er lediglich durch Ein­stecken in den Isolationsträger auf einfache Weise in die­sen eingebettet werden, und sein Schaltkopf kann außerhalb des Trägers liegen. Dieser nach Art eines Temperaturschutz­schalters arbeitende Schalter kann aber auch durch einen sogenannten Klixon-Thermostaten gebildet sein, der mit ei­nem Wärmeleitstab zusammenwirkt, welcher die Wärme von der Fühlstelle zum beispielsweise durch einen Bimetallfühler gebildeten Temperaturfühler im Schaltkopf des Thermostaten überträgt.If an interruption of an electrical circuit is used to switch from the boil-up phase to the boil-up phase, the parboil control device expediently has a temperature sensor actuating the associated switch, which is preferably countered by an insulation layer is thermally insulated above the jet heater, which can be achieved in a simple manner without special additional insulation measures in that the temperature sensor is embedded in the already existing insulation material of the carrier, that is to say on the side of the jet heating resistor facing away from the heating plate. If the temperature sensor is designed as an expansion rod sensor, it can be embedded in the insulation carrier in a simple manner simply by inserting it into the insulation carrier, and its switching head can be located outside the carrier. This switch, which operates in the manner of a temperature protection switch, can also be formed by a so-called Klixon thermostat, which interacts with a heat conducting rod, which transfers the heat from the sensing point to the temperature sensor in the switching head of the thermostat, for example formed by a bimetal sensor.

Diese und weitere Merkmale von bevorzugten Weiterbildungen der Erfindung gehen auch aus der Beschreibung und den Zeich­nungen hervor, wobei die einzelnen Merkmale jeweils für sich allein oder zu mehreren in Form von Unterkombinationen bei einer Ausführungsform der Erfindung und auf anderen Gebieten verwirklicht sein und vorteilhafte sowie für sich schutz­fähige Ausführungen darstellen können, für die hier Schutz beansprucht wird. Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden im folgenden näher er­läutert. In den Zeichnungen zeigen:

  • Fig. 1 einen erfindungsgemäßen Strahlheizkörper im Querschnitt und in vereinfachter Darstellung,
  • Fig. 2 den Strahlheizkörper gemäß Fig. 1 in Draufsicht,
  • Fig. 3 eine schematische Darstellung der Verteilung der Strahl-Leistungsdichte in der Ankoch­phase,
  • Fig. 4 eine weitere Ausführungsform eines Strahl­heizkörpers in einer Darstellung entspre­chend Fig. 2,
  • Fig. 5 einen Schnitt nach der Linie V-V in Fig. 4 in abgewickelter Darstellung,
  • Fig. 6 eine weitere Ausführungsform in einer Dar­stellung entsprechend Fig. 5,
  • Fig. 7 einen Schnitt nach der Linie VII-VII in Fig. 6.
These and further features of preferred developments of the invention also emerge from the description and the drawings, the individual features being realized individually and in groups in the form of subcombinations in one embodiment of the invention and in other fields, and advantageous and for themselves Protectable designs for which protection is claimed here. Embodiments of the invention are shown in the drawings and are explained in more detail below. The drawings show:
  • 1 shows a radiant heater according to the invention in cross section and in a simplified representation,
  • 2 shows the radiant heater according to FIG. 1 in plan view,
  • 3 shows a schematic representation of the distribution of the beam power density in the parboiling phase,
  • 4 shows a further embodiment of a radiant heater in a representation corresponding to FIG. 2,
  • 5 shows a section along the line VV in FIG. 4 in a developed representation,
  • 6 shows a further embodiment in a representation corresponding to FIG. 5,
  • 7 is a section along the line VII-VII in Fig. 6th

Wie die Fig. 1 und 2 zeigen, weist ein erfindungsgemäßer Strahlheizkörper 1, der zur Anordnung an der Unterseite ei­ner aus Glaskeramik oder dgl. bestehenden, transluzenten Heizplatte 2 bestimmt ist, einen schalen- bzw. napfförmigen Träger 4 auf. Der Träger 4 besteht im wesentlichen aus ei­ner ein- oder mehrteiligen Innenschale 5 aus mindestens ei­nem Isolationswerkstoff und einer relativ dünnwandigen, dem Schutz und der Fassung der Innenschale 5 dienenden Außen­schale 6, die bevorzugt aus Stahlblech besteht. Die Innen­schale 5 trägt auf ihrem im wesentlichen ebenen bzw. zur Heizplatte 2 parallelen Boden einen durch elektrischen Strom zu betreibenden Strahlheizer 7 in Form mindestens eines un­verkapselten Heizwiderstandes 8, wobei es jedoch denkbar ist, daß zumindest ein Teil der Leistung des Strahlheizkörpers 1 auch mit einem verkapselten Strahlheizkörper, also einer Kolbenlampe, wie einem Halogenstrahler, betrieben werden kann. Die bevorzugte Anordnung liegt jedoch darin, daß der Strahlheizkörper ausschließlich unverkapselte Heizwiderstän­de aufweist.1 and 2 show, a radiant heater 1 according to the invention, which is intended to be arranged on the underside of a translucent heating plate 2 made of glass ceramic or the like, has a shell-shaped or cup-shaped support 4. The carrier 4 consists essentially of a one-part or multi-part inner shell 5 made of at least one insulation material and a relatively thin-walled outer shell 6, which serves to protect and mount the inner shell 5, which preferably consists of sheet steel. The inner shell 5 carries on its substantially flat or parallel to the heating plate 2 floor a radiant heater 7 to be operated by electrical current in the form of at least one encapsulated heating resistor 8, but it is conceivable that at least part of the power of the radiant heater 1 also with a encapsulated radiant heater, i.e. a bulb lamp, such as a halogen lamp, can be operated. However, the preferred arrangement is that the radiant heater has only unencapsulated heating resistors.

Der Heizwiderstand 8 ist in einer Doppelspirale etwa derart um die Mittelachse des Strahlheizkörpers 1 verlegt, daß sei­ne beiden Anschlußenden 14 an der Peripherie des im wesent­ lichen durch die äußerste, annähernd ringförmig geschlos­sene Spiralwindung begrenzten Heizfeldes 1O liegen. Eine vorbestimmte Anzahl äußerer Windungen des Heizwiderstan­des 8, nämlich im dargestellten Ausführungsbeispiel etwa die Hälfte aller Windungen bzw. etwa drei Spiralwindungen, sind als Ankoch-Randbeheizung 9 zum Betrieb mit relativ erhöhter Strahl-Leistungsdichte während der Ankochphase vor­gesehen, während die übrigen, innerhalb dieser Randbehei­zung 9 liegenden Windungen desselben Heizwiderstandes eine restliche Teilleistung 11 bilden, die in veränderbarem Lei­stungsgefälle gegenüber der Randbeheizung 9 betrieben wer­den kann.The heating resistor 8 is laid in a double spiral approximately in such a way about the central axis of the radiant heater 1 that its two connection ends 14 on the periphery of the essence Lichen heating field 1O delimited by the outermost, almost annularly closed spiral turn. A predetermined number of outer turns of the heating resistor 8, namely about half of all turns or about three spiral turns in the exemplary embodiment shown, are provided as parboiling edge heating 9 for operation with a relatively increased beam power density during the parboiling phase, while the rest are within this marginal heating 9 lying turns of the same heating resistor form a residual partial power 11, which can be operated in a variable power gradient compared to the edge heating 9.

Der gesamte Strahlheizer 7, also der einzige diesen bilden­de Heizwiderstand 8 wird während des gesamten Heizbetriebes über eine einstellbare Regeleinrichtung oder ein beispiels­weise taktendes Leistungssteuergerät betrieben, unter des­sen Zwischenschaltung der Strahlheizer 7 an den Netzstrom angeschlossen ist. Zweckmäßig befindet sich im Raum zwischen dem Strahlheizer 7 und der Heizplatte 2 ein das Heizfeld 1O überkreuzender Temperaturfühler 16, der im Falle der Verwen­dung einer Regeleinrichtung 12 für den Betrieb des Strahl­heizers 7 diese beeinflussen oder einem Temperaturbegrenzer 15 zugeordnet sein kann, dessen Schaltkopf unmittelbar an der Außenseite des vom Temperaturfühler 16 durchsetzten Trägers 4 angeordnet ist.The entire jet heater 7, that is to say the only heating resistor 8 forming this, is operated during the entire heating operation by means of an adjustable control device or, for example, a clocking power control device, with the jet heater 7 being connected to the mains current in between. Appropriately, there is a temperature sensor 16 crossing the heating field 10 in the space between the radiant heater 7 and the heating plate 2, which in the case of using a control device 12 for the operation of the radiant heater 7 can influence this or can be assigned to a temperature limiter 15, the switching head of which is located directly on the Outside of the carrier 4 penetrated by the temperature sensor 16 is arranged.

Für den hinsichtlich der relativen Strahl-Leistungsdichte unterschiedlichen Betrieb des Strahlheizers 7 in der Ankoch­phase einerseits und in der Fortkochphase andererseits ist eine zusätzliche Regeleinrichtung 13 vorgesehen, deren Tempe­raturfühler 17 der Temperatur im Inneren bzw. im Vollquer­schnitt der Innenschale 5 ausgesetzt ist. Der Temperatur­fühler 17, der ein Dehnstabfühler mit einem Außenrohr und einem darin angeordneten Innenstab unterschiedlicher Aus­ dehnungskoeffizienten oder ein Wärmeleitstab sein kann, welcher die Wärme von der Fühlstelle dem unterhalb des Schaltkopfes des Temperaturbegrenzers 15 an der Außensei­te des Trägers 4 liegenden Schaltkopf der Regeleinrich­tung 13 zuführt, liegt ebenfalls parallel zur Heizplatte 2, jedoch unterhalb der den Strahlheizer 7 aufnehmenden Boden­fläche der Innenschale 5 und oberhalb von deren Unterseite, also auf der von der Heizplatte 2 bzw. dem Temperaturfühler 16 abgekehrten Seite des Strahlheizers 7 in den Isolations­werkstoff der Innenschale 5 eingebettet und etwa radial zur Mittelachse des Strahlheizkörpers 1, wobei dieser Tempera­turfühler 17 kürzer als die Hälfte der Weite des Heizfeldes 1O derart sein kann, daß er nur auf einer Seite von dessen Mittelachse im wesentlichen ausschließlich im Bereich der zugehörigen Windungen der Randbeheizung 9 liegt. Der im Schaltkopf der als Abschalteinrichtung ausgebildeten Regel­einrichtung 13 angeordnete Ankochschalter 18 in Form bei­spielsweise eines Schnappschalters, der nicht unmittelbar an die Stromzufuhr für den Strahlheizer 7 angeschlossen ist, ist in einem Kurzschlußkreis einer Kurzschlußschaltung für die Teilleistung 11 angeordnet, also über seine beiden An­schlußpole ausschließlich mit zwei im Abstand zueinander­liegenden Stellen des Heizwiderstandes 8 so elektrisch lei­tend verbunden, daß bei geschlossenem Ankochschalter der der Teilleistung 11 zugehörige, die Innenzone des Heizfel­des 1O belegende Längsabschnitt des Heizwiderstandes 8 durch Kurzschließen im wesentlichen außer Betrieb genommen ist. Dadurch wird der der Ankoch-Randbeheizung zugehörige rest­liche und im wesentlichen bis an die Peripherie des Heiz­feldes 1O reichende Längsabschnitt des Heizwiderstandes 8 während der geschlossenen Kurzschlußschaltung 19 mit rela­tiv wesentlich erhöhter Strahl-Leistungsdichte betrieben und nach dem Einschalten sehr schnell so weit aufgeheizt, daß durch die Heizplatte 2 ein sichtbares Glühen wahrge­ nommen werden kann. Sobald der Temperaturfühler 17, der in inniger Berührung mit dem Isolationswerkstoff oder in ei­nem Hohlraum in der Innenschale 5 im wesentlichen berüh­rungsfrei eingebettet sein kann, mit der infolge seiner wärmegedämmten Anordnung gegebenen Zeitverzögerung auf die Abschalttemperatur der Regeleinrichtung 13 erwärmt worden ist, öffnet der Ankochschalter 18, so daß nunmehr auch der der Teilleistung 11 zugehörige Längsabschnitt des Heiz­widerstandes 8 in vollen Leistungsbetrieb geht und somit der Unterschied der Strahl-Leistungsdichte zwischen dem Be­reich der Ankoch-Randbeheizung 9 und demjenigen der Teil­leistung 11 zumindest reduziert wird. Dadurch soll während des Ankochens möglichst lange erhöhte Leistung zur Verfü­gung stehen, ohne daß während des Fortkochens und nach An­sprechen des die Regeleinrichtung 13 bildenden Temperatur­wächters wieder eine Rückschaltung auf die erhöhte Leistung erfolgt.An additional control device 13 is provided for the different operation of the jet heater 7 in the parboiling phase, on the one hand, and in the boiling phase, on the other hand, whose temperature sensor 17 is exposed to the temperature inside or in the full cross section of the inner shell 5. The temperature sensor 17, which is an expansion rod sensor with an outer tube and an inner rod arranged therein with different offs expansion coefficient or a heat-conducting rod, which supplies the heat from the sensing point to the switching head of the control device 13 located below the switching head of the temperature limiter 15 on the outside of the carrier 4, is also parallel to the heating plate 2, but below the bottom surface of the inner shell receiving the jet heater 7 5 and above the underside, i.e. on the side of the radiant heater 7 facing away from the heating plate 2 or the temperature sensor 16, embedded in the insulation material of the inner shell 5 and approximately radially to the central axis of the radiant heater 1, this temperature sensor 17 being shorter than half the width of the heating field 10 can be such that it lies only on one side of its central axis essentially exclusively in the area of the associated turns of the edge heating 9. Arranged in the switch head of the control device 13 designed as a cut-off switch 18 in the form of, for example, a snap switch, which is not directly connected to the power supply for the radiant heater 7, is arranged in a short-circuit circuit of a short-circuit for the partial power 11, that is to say only via its two connecting poles two spaced apart locations of the heating resistor 8 so that they are electrically connected so that when the parboiler 11 is closed, the longitudinal section of the heating resistor 8 belonging to the partial power 11 and occupying the inner zone of the heating field 10 is essentially taken out of operation by short-circuiting. As a result, the residual heating associated with the parboil edge heating and essentially extending to the periphery of the heating field 10 is operated with the longitudinal section of the heating resistor 8 during the closed short-circuit circuit 19 with a relatively substantially increased beam power density and, after being switched on, heated up very quickly so that by the Heating plate 2 a visible glow can be taken. As soon as the temperature sensor 17, which can be embedded essentially in contact with the insulation material or in a cavity in the inner shell 5, has been heated to the switch-off temperature of the control device 13 with the time delay due to its thermally insulated arrangement, the heating switch 18 opens, so that now also the longitudinal section of the heating resistor 8 belonging to the partial power 11 goes into full power operation and thus the difference in the jet power density between the area of the heating edge heating 9 and that of the partial power 11 is at least reduced. As a result, increased power should be available for as long as possible during the boil-up without switching back to the increased power again during continued cooking and after the temperature monitor forming the control device 13 has responded.

Die durch die erfindungsgemäße Ausbildung zu erzielende Ver­kürzung der Ankochzeit ergibt sich auch aus dem Umstand, daß der Kochgefäßboden 3 von Kochgefäßen in der Regel derart ge­wölbt ist, daß der Kochgefäßboden 3 im Bereich seines Außen­randes den direktesten Kontakt zur Heizplatte 2 hat und da­her dort ein besonders schneller Wärmetransport möglich ist. In Fig. 3 ist mit Pfeilen, deren Länge die Strahl-Leistungs­dichte repräsentieren, angedeutet, daß beim Erfindungsgegen­stand eine Betriebsanordnung derart vorgesehen ist, daß in der Ankochphase die Leistungsdichte in diesem Randbereich am größten ist. In der Fortkochphase kann dabei entweder diese äußere Leistungsdichte im Randbereich 9 zurückgefahren, die Leistungsdichte im Bereich der Teilleistung 11 hochge­fahren werden oder es können beide Vorgänge gleichzeitig durchgeführt werden. Die Schalthysterese der Regeleinrich­tung 13 ist so groß gewählt, daß sie vor dem nahezu voll­ ständigen Abkühlen des Strahlheizkörpers 1 nicht mehr in Kurzschlußstellung, also in Schließstellung des Ankoch­schalters 18 zurückschaltet.The shortening of the boil-up time to be achieved by the design according to the invention also results from the fact that the cooking vessel base 3 of cooking vessels is usually curved in such a way that the cooking vessel base 3 has the most direct contact with the heating plate 2 in the region of its outer edge and therefore there is a particular one faster heat transfer is possible. In Fig. 3, arrows, the length of which represent the beam power density, indicate that an operating arrangement is provided in the subject matter of the invention in such a way that the power density is greatest in this edge region in the boiling phase. In the continued cooking phase, either this external power density in the edge area 9 can be reduced, the power density in the area of the partial power 11 can be increased, or both processes can be carried out simultaneously. The switching hysteresis of the control device 13 is chosen so large that it is almost full before constant cooling of the radiant heater 1 no longer switches back to the short-circuit position, that is to say in the closed position of the parboiler switch 18.

Anstatt den der inneren Teilleistung 11 zugehörigen Längs­abschnitt des Heizwiderstandes 8 für die Ankochphase kurz­zuschließen, kann dieser Längsabschnitt auch durch einen Heizleiter mit hohem positivem Temperaturkoeffizienten gebildet sein, der beispielsweise aus Molybdän-Disilizid besteht. Dieser, zwar durch einen gesonderten, in Reihe mit dem übrigen Heizwiderstand bzw. mit dem der Ankoch-Randbeheizung 9 zugehörigen Längsab­schnitt geschaltete PTC-Widerstand bewirkt sofort nach dem Einschalten des Strahlheizkörpers aufgrund seines geringe­ren Anfangswiderstandes einen sehr hohen Anlaufstrom und zusätzlich signalisiert dieser PTC-Widerstand durch schnel­le Erwärmung auf Glühtemperatur auch optisch ein ähnlich schnelles Aufheizen des Strahlheizkörpers, wie das bei der Verwendung von Halogenlampen als Strahlheizer der Fall ist. Danach regelt sein sich erhöhender Eigenwiderstand die Lei­stung in der Fortkochphase selbsttätig zurück.Instead of short-circuiting the longitudinal section of the heating resistor 8 associated with the inner partial power 11 for the boil-up phase, this longitudinal section can also be formed by a heating conductor with a high positive temperature coefficient, which consists, for example, of molybdenum disilicide. This, by a separate PTC resistor connected in series with the rest of the heating resistor or with the longitudinal section associated with the parboiler heating 9, causes a very high starting current immediately after switching on the radiant heater due to its lower initial resistance and additionally signals this PTC resistor due to rapid heating to the annealing temperature, the radiant heater is visually similarly quick to heat up, as is the case when using halogen lamps as radiant heaters. Thereafter, its increasing inherent resistance automatically regulates the output in the continued cooking phase.

Der Träger 4 ist mit der Stirnseite des Schalenrandes der Innenschale 5 unter Druck ganzflächig gegen die Innen- bzw. Unterseite der Heizplatte gespannt, so daß also der Innen­umfang dieses Anlagerandes im wesentlichen mit der Peri­pherie bzw. Außenbegrenzung des Heizfeldes 1O zusammenfällt. Der Heizwiderstand 8 kann durch wenigstens teilweise Ein­bettung seiner Wendeln in den Isolierwerkstoff der Innen­schale 5 unverrückbar gegenüber dieser festgelegt sein. Ferner kann der Strahlheizkörper im Grundriß statt kreis­rund auch von der Kreisform abweichend rund oder recht­eckig bzw. quadratisch ausgebildet sein, wobei dann der Heiz­widerstand zweckmäßig in seiner Spiralform dieser Außenkon­tur folgt.The carrier 4 is stretched with the end face of the edge of the shell of the inner shell 5 under pressure over the entire surface against the inside or underside of the heating plate, so that the inner circumference of this contact edge essentially coincides with the periphery or outer boundary of the heating field 10. The heating resistor 8 can be immovably fixed to the inner shell 5 by at least partially embedding its coils in the insulating material. Furthermore, instead of being circular, the radiant heater can also have a circular, rectangular or square shape, deviating from the circular shape, the heating resistor then expediently following this outer contour in its spiral shape.

In den Fig. 4 bis 7 sind für einander entsprechende Teile die gleichen Bezugszeichen wie in den Fig. 1 bis 3, jedoch in den Fig. 4 und 5 mit dem Index "a" und in den Fig. 6 und 7 mit dem Index "b" verwendet.4 to 7 are the same reference numerals for corresponding parts as in Figs. 1 to 3, but in Figs. 4 and 5 with the index "a" and in Figs. 6 and 7 with the index " b "is used.

Der Strahlheizkörper 1a gemäß den Fig. 4 und 5 weist als Ankoch-Randbeheizung 9a einen in nur einem einzigen Um­gang, also nur in einer einstrangigen Schlinge oder bifilar verlegten äußersten Heizwiderstand aus besonders dünnem, hochbelastbaren Widerstandsdraht auf, also aus einem Wider­standsdraht, der dünner und höherbelastbar bzw. belastet ist, als der der Teilleistung 11a zugehörige Heizwiderstand. Der Strahlheizer dieses Strahlheizkörpers 1a ist also im Grunde genommen zweikreisig ausgebildet, jedoch sind die beiden Heizkreise parallel oder in Reihe so geschaltet, wes­halb sie stets simultan ein- und ausgeschaltet sind.The radiant heater 1 a according to FIGS. 4 and 5 has as the parboiling edge heater 9 a one in only one operation, i.e. only in a single-strand loop or bifilar external heating resistor made of particularly thin, heavy-duty resistance wire, i.e. of a resistance wire that is thinner and is more resilient than the heating resistor belonging to the partial power 11a. The radiant heater of this radiant heater 1a is therefore basically of two circuits, but the two heating circuits are connected in parallel or in series, which is why they are always switched on and off simultaneously.

Wie Fig. 5 zeigt, besteht die Innenschale 5a aus zwei auf­einanderliegenden Tragkörpern 2O, 21 unterschiedlicher Iso­lierwerkstoffe und Dicken, wobei der untere, plattenförmig geschüttete Tragkörper 2O aus einer pulvrigen gepressten Masse besteht, relativ druckelastisch ist, eine größere Dicke als der ganzflächig daraufliegende Formkörper 21 hat und vor allem einen thermischen Isolationswert aufweist, der wesentlich höher als derjenige des Tragkörpers 21 ist. Dem­gegenüber ist der beispielsweise scheibenförmige Tragkörper 21 ein relativ formstabiler Formkörper aus verpressten mine­ralischen Fasern, an welchem die Heizwiderstände durch stel­lenweise Einbettung gehaltert sind. Dieser Tragkörper 21 weist an der Oberseite nach oben etwa um seine übrige Dicke vorstehende, zur Mittelachse des Strahlheizkörpers 1a etwa radiale und einteilig mit dem übrigen Tragkörper 21 ausgebil­dete Stege auf. Die nur im radial äußeren Bereich des Heiz­feldes liegenden Stege sind jeweils zwischen Vertiefungen 23 gebildet, welche von der Peripherie des Heizfeldes nur über einen Teil der Windungen der Heizwiderstände reichen. Die radial innerhalb der Vertiefungen 23, also im Mittelbe­reich liegenden Windungen stehen daher in direkter Be­rührung mit der Innenschale 5a. Im Bereich der Stege 22, die außer der Ankoch-Randbeheizung 9a noch drei weitere Windungen des Heizwiderstandes 8a erfassen, sind diese Windungen durch Einbettung ausschließlich an den Stegen 22 gehaltert, während sie gemäß Fig. 5 im Bereich der Vertie­fungen diese frei schwebend, also gegenüber der Innenschale 5a berührungsfrei überspannen bzw. überbrücken oder nur schwach aufliegen. Der Abstand der die Vertiefungen parallel zu deren Bodenflächen überbrückenden Längsabschnitte der Heizwiderstände von diesen Bodenflächen kann kleiner als der Außendurchmesser dieser Heizwiderstände, insbesondere etwa halb so groß sein, während die Heizwiderstände in die Stege 22 etwa um die Hälfte ihres Außendurchmessers eingebettet sind. Der Abstand zwischen benachbarten Stegen kann etwa dem doppelten von deren Breite entsprechen.5 shows, the inner shell 5a consists of two superimposed support bodies 2O, 21 of different insulating materials and thicknesses, the lower, plate-shaped support body 2O consisting of a powdery pressed mass, being relatively pressure-elastic, a greater thickness than the molded body 21 lying thereon over the entire surface has and above all has a thermal insulation value which is significantly higher than that of the support body 21. In contrast, the disk-shaped support body 21, for example, is a relatively dimensionally stable molded body made of pressed mineral fibers, on which the heating resistors are held by embedding in places. This support body 21 has on the upper side upwards about its remaining thickness, approximately radial to the central axis of the radiant heater 1 a and integrally formed with the rest of the support body 21 webs. The webs lying only in the radially outer region of the heating field are each formed between depressions 23, which extend only from the periphery of the heating field part of the turns of the heating resistors are sufficient. The windings lying radially inside the depressions 23, that is to say in the central region, are therefore in direct contact with the inner shell 5a. In the area of the webs 22, which in addition to the parboiler edge heating 9a also detect three further turns of the heating resistor 8a, these turns are held by embedding exclusively on the webs 22, while according to FIG. 5 they float freely in the area of the depressions, that is to say opposite span or bridge the inner shell 5a without contact or only lie weakly. The distance of the longitudinal sections of the heating resistors bridging the depressions parallel to their bottom surfaces from these bottom surfaces can be smaller than the outside diameter of these heating resistors, in particular about half as large, while the heating resistors are embedded in the webs 22 by about half their outside diameter. The distance between adjacent webs can be approximately twice their width.

Wie die Fig. 6 und 7 zeigen, können im oberen Tragkörper 21b statt der Vertiefungen 23 auch Durchbrüche bzw. über die Dicke des Tragkörpers 21b durchgehende Öffnungen 23b vorge­sehen sein, welche wenigstens teilweise von Vorsprüngen 24 des unteren Tragkörpers 2Ob steckgliedartig ausgefüllt sind. Die Vorsprünge 24 reichen im dargestellten Ausführungsbei­spiel nach oben über die Oberseiten der Stege 22b gering­fügig hinaus, sind jedoch im Bereich jedes sie überqueren­den Längsabschnittes des jeweiligen Heizwiderstandes mit rinnenförmigen Aufnahmenuten 25 versehen, deren Bodenflächen geringfügig tiefer als die Oberseite der Stege 21b liegen können. Die Tiefe der Aufnahmenuten 25, gegenüber denen die zugehörigen Längsabschnitte der Heizwiderstände berührungs­frei oder lediglich uneingebettet lose anliegend vorgesehen sein können, ist zweckmäßig so groß, daß die benachbarte Auf­ nahmenuten 25 voneinander trennenden Stege des Tragkörpers 21b nur etwa bis zur Mitte des Außendurchmessers dieser Längsabschnitte reichen. Durch die beschriebene Ausbildung ist die Wärmeableitung von den genannten, zwischen den Stegen 21b liegenden Längsabschnitten der Strahlheizkörper in die Innenschale 5b besonders gering, so daß diese Längs­abschnitte nach dem Einschalten vom kalten Zustand sehr schnell zum sichtbaren Glühen kommen. Dadurch, daß der Trag­körper 2Ob durch die Vorsprünge 24 wenigstens in einigen, rasterartig verteilten Zonen über die Unterseite des Trag­körpers 21b hinaus verdickt ist, ergibt sich eine hervor­ragende zusätzliche Wärmedämmung. Er könnte aber auch eben sein.As shown in FIGS. 6 and 7, in the upper support body 21b instead of the recesses 23 there can also be openings or openings 23b which are continuous over the thickness of the support body 21b and which are at least partially filled by projections 24 of the lower support body 2Ob. In the exemplary embodiment shown, the projections 24 extend slightly above the upper sides of the webs 22b, but are provided with channel-shaped receiving grooves 25 in the region of each longitudinal section crossing them, the bottom surfaces of which can be slightly lower than the upper side of the webs 21b. The depth of the receiving grooves 25, against which the associated longitudinal sections of the heating resistors can be provided in a contact-free manner or only loosely lying against the embedded surface, is expediently so large that the adjacent opening grooves 25 separating webs of the support body 21b extend only approximately to the middle of the outer diameter of these longitudinal sections. As a result of the design described, the heat dissipation from the above-mentioned longitudinal sections of the radiant heaters lying between the webs 21b into the inner shell 5b is particularly low, so that these longitudinal sections very quickly come to a visible glow after being switched on from the cold state. The fact that the support body 20b is thickened by the projections 24 at least in a few, grid-like zones beyond the underside of the support body 21b results in excellent additional thermal insulation. But it could also be.

Im Falle der Ausbildung nach Fig. 1 kann die Regeleinrich­tung 13 ähnlich wie diejenige nach der DE-OS 32 47 O28 bzw. diejenige nach der EP-A-O1 14 3O7 ausgebildet sein, auf die wegen weiterer Einzelheiten Bezug genommen wird. Die Ankoch-­Randbeheizung liegt im selben, vom Träger 4 und der Heiz­platte 2 umschlossenen Raum wie der übrige Strahlheizer 7 und ist von diesem nicht durch einen Zwischensteg des Trä­gers ringförmig getrennt.In the case of the embodiment according to FIG. 1, the control device 13 can be designed similarly to that according to DE-OS 32 47 O28 or that according to EP-A-O1 14 3O7, to which reference is made for further details. The parboiler heating is in the same space as that of the rest of the jet heater 7, which is enclosed by the carrier 4 and the heating plate 2, and is not separated from it in a ring shape by an intermediate web of the carrier.

Es ergibt sich bei der Erfindung im Außenbereich eine höhere spezifische Leistung, die unter Umständen so hoch sein kann, wie man sie im Dauerbetrieb dem Heizwiderstand und/oder der Glaskeramikplatte nicht zumuten könnte. Durch ihre meist nur temporäre Wirkung und die höhere Leistungsabnahme in diesem Bereich, insbesondere während der Ankochphase, löst sie aber keine schädlichen Wirkungen aus. Es könnte auch generell im Außenbereich eine höhere spezifische Leistung vorgesehen sein. Sie wirkt sich hauptsächlich während der Ankochzeit aus, indem der äußere Heizleiter schneller glüht, damit die erwünschten optischen Wirkungen auslöst und früher mit der Wärmeübertragung an das Kochgefäß beginnt. Während der Fort­kochphase spielt diese vorteilhaft ohne Umschaltung auf­rechterhaltene Leistungsverteilung mit Bevorzugung des Rand­bereiches sich kaum, zumindest aber nicht negativ aus, weil dann die Gesamtleistung z.B. durch taktendes Ein- und Aus­schalten der Gesamtleistung herabgesetzt ist. Es hat sich gezeigt, daß eine höhere spezifische Belastung des Randbe­reiches und insbesondere der äußeren Heizleiterwindung für deren Lebensdauer keine wesentliche Rolle spielt, da diese selbst bei einiger Überlastung nicht durchbrennen.The invention results in a higher specific power in the outdoor area, which may be as high as it could not be expected from the heating resistor and / or the glass ceramic plate in continuous operation. Due to its mostly temporary effect and the higher power consumption in this area, especially during the parboiling phase, it does not trigger any harmful effects. In general, a higher specific power could also be provided outdoors. It mainly affects during the boil-up time, as the outer heating conductor glows faster, so that the desired optical effects are triggered and earlier with the Heat transfer to the cooking vessel begins. During the continued cooking phase, this power distribution, which is advantageously maintained without switching, hardly plays out, at least not negatively, because the total power is then reduced, for example, by switching the total power on and off cyclically. It has been shown that a higher specific load on the edge area and in particular on the outer heating conductor winding does not play an important role in their service life, since these do not burn out even with some overload.

Claims (11)

1. Strahlheizkörper (1) zur Beheizung einer Heiz­platte (2), insbesondere einer Glaskeramik-Heiz­platte, mit mindestens einer Kochstelle, wobei der Strahlheizkörper einen Träger (4) für einen elektrischen Strahlheizer (7) aus mindestens einem Strahlheizwiderstand (8), wie einer Heiz­wendel, aufweist und der Strahlheizer (7) sich von einer ringförmigen, eine feste Heizfeldgröße bestimmenden Peripherie eines Heizfeldes (1O) über eine Mittelzone bis in eine Innenzone des Heizfeldes erstreckt, dadurch gekennzeichnet, daß ein einer Teilleistung zugehöriger Bereich des Strahlheizers (7) die Peripherie des Heizfeldes (1O) bildet und daß dieser Bereich in Form einer Randbeheizung (9) mindestens über einen Teil einer Ankochphase mit einer Strahl-Leistungs­dichte versehen ist, die gegenüber einem inner­ halb dieser Randbeheizung liegenden, mindestens einer weiteren Teilleistung (11) zugehörigen, Bereich des Strahlheizers (7) erhöht ist.1. radiant heater (1) for heating a heating plate (2), in particular a glass ceramic heating plate, with at least one hotplate, the radiant heater having a support (4) for an electric radiant heater (7) comprising at least one radiant heating resistor (8), such as one Heating coil, and the radiant heater (7) extends from an annular periphery of a heating field (10) which determines a fixed heating field size, over a central zone into an inner zone of the heating field, characterized in that an area of the radiant heater (7) belonging to a partial output The periphery of the heating field (10) forms and that this area in the form of an edge heating (9) is provided with a beam power density at least over part of a parboiling phase, which is compared to an internal one half of this edge heating, at least one additional partial power (11) belonging to the area of the jet heater (7) is increased. 2. Strahlheizkörper nach Anspruch 1, dadurch gekennzeichnet, daß die Randbeheizung (9) im wesentlichen über die ge­samte Ankochphase mit relativ erhöhter Leistung geschal­tet ist.2. Radiant heater according to claim 1, characterized in that the edge heating (9) is switched substantially over the entire parboiling phase with relatively increased power. 3. Strahlheizkörper nach Anspruch 1 oder 2, dadurch gekenn­zeichnet, daß eine Teilleistung (11) des Strahlheizers (7) zur Beendigung der Ankochphase im wesentlichen zeit­abhängig, vorzugsweise über einen Temperaturschalter mit hoher Schalttemperaturdifferenz bzw. -Hysterese und/oder mit geringerer Wärme-Ankoppelung zum Strahlheizer (7), geschaltet ist.3. radiant heater according to claim 1 or 2, characterized in that a partial power (11) of the radiant heater (7) to end the parboiling phase essentially time-dependent, preferably via a temperature switch with a high switching temperature difference or hysteresis and / or with less heat coupling to the jet heater (7). 4. Strahlheizkörper nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß, insbesondere bei Bildung der Randbeheizung (9) und des inneren Teiles des Strahl­heizers (7) durch einen einzigen Strahl-Heizwiderstand (8), die Steuerung der Ankochphase durch eine Kurzschluß­schaltung (19) des inneren Teiles des Strahlheizers (7) gebildet ist.4. Radiant heater according to one of the preceding claims, characterized in that, in particular when the edge heating (9) and the inner part of the radiant heater (7) are formed by a single radiant heating resistor (8), the control of the heating phase by a short circuit (19 ) of the inner part of the jet heater (7) is formed. 5. Strahlheizkörper nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der innere Teil des Strahl­heizers (7) durch einen Strahlheizwiderstand mit hohem positivem Temperaturkoeffizienten (PTC), gebildet ist.5. Radiant heater according to one of the preceding claims, characterized in that the inner part of the radiant heater (7) is formed by a radiant heating resistor with a high positive temperature coefficient (PTC). 6. Strahlheizkörper nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Ankoch-Randbeheizung (9a) durch einen gesonderten, insbesondere einstrangig bzw. bifilar geführten sich über etwa 36O° erstreckenden Heiz­kreis gebildet ist.6. Radiant heater according to one of the preceding claims, characterized in that the parboil edge heating (9a) is formed by a separate, in particular single-stranded or bifilar, extending heating circuit extending over approximately 360 °. 7. Strahlheizkörper nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß wenigstens die Randbeheizung (9a) mit geringerer Wärmeleit-Ankoppelung als der innere Teil des Strahlheizers (7a) mit dem Träger (4a) verbun­den ist, vorzugsweise eine geringere spezifische Flächen­berührung mit dem Träger (4a) als der innere Teil auf­weist und daß eine Ankoch-Steuereinrichtung insbesondere ausschließlich durch die Wärmeleitverbindung zwischen dem Strahlheizer (7a) und dem Träger (4a) gebildet ist.7. Radiant heater according to one of the preceding claims, characterized in that at least the edge heating (9a) with a lower heat-conducting coupling than the inner part of the radiant heater (7a) is connected to the carrier (4a), preferably a lower specific surface contact with the carrier (4a) as the inner part and that a parboiler control device is in particular formed exclusively by the heat-conducting connection between the jet heater (7a) and the carrier (4a). 8. Strahlheizkörper nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß Längsabschnitte wenigstens des Heizwiderstandes der Randbeheizung (9a) im wesent­lichen frei schwebend berührungsfrei gegenüber dem Trä­ger (4a) angeordnet sind.8. Radiant heater according to one of the preceding claims, characterized in that longitudinal sections of at least the heating resistor of the edge heating (9a) are arranged essentially freely floating contact-free relative to the carrier (4a). 9. Strahlheizkörper nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß Längsabschnitte wenigstens des Heizwiderstandes der Randbeheizung (9b), insbesondere abwechselnd, in Bereichen des Trägers (4b) liegen, die unterschiedliche Wärmeleitfähigkeit aufweisen, wobei vor­zugsweise die den Strahlheizer aufnehmende Seite des Trä­gers (4b) durch zwei aufeinanderliegende Tragkörper (2Ob, 21b) gebildet ist, von denen der untere eine geringere spezifische Wärmeleitfähigkeit aufweist und wenigstens im Bereich der Randbeheizung (9b) Öffnungen (23b) im oberen Tragkörper (21b) durchsetzt.9. Radiant heater according to one of the preceding claims, characterized in that longitudinal sections of at least the heating resistor of the edge heating (9b), in particular alternately, lie in areas of the carrier (4b) which have different thermal conductivity, preferably the side of the carrier receiving the radiant heater ( 4b) is formed by two superimposed support bodies (2Ob, 21b), of which the lower one has a lower specific thermal conductivity and penetrates openings (23b) in the upper support body (21b) at least in the area of the edge heating (9b). 1O. Strahlheizkörper nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Träger (4a) eine dick­wandige Innenschale (5a) aus Isolierwerkstoff für die Auf­nahme des Strahlheizers (7a) und eine dünnwandige Außen­schale (6a) als Versteifung aufweist und daß vorzugsweise der obere Tragkörper (21) aus faserigem Isolierwerk­stoff und/oder der untere Tragkörper (2O) aus im wesent­lichen pulverigem Isolierwerkstoff besteht.1O. Radiant heater according to one of the preceding claims, characterized in that the carrier (4a) has a thick-walled inner shell (5a) made of insulating material for receiving the radiant heater (7a) and a thin-walled outer shell (6a) as stiffening and that preferably the upper supporting body (21) consists of fibrous insulating material and / or the lower supporting body (2O) consists of essentially powdery insulating material. 11. Strahlheizkörper nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß eine Ankoch-Regeleinrichtung (13) einen insbesondere als Dehnstabfühler ausgebildeten Temperaturfühler (16) aufweist, der vorzugsweise über eine Isolationsschicht gegenüber dem Strahlheizer (7) wärmegedämmt, insbesondere in die Innenschale (5) ein­gebettet ist.11. Radiant heater according to one of the preceding claims, characterized in that a parboil control device (13) has a temperature sensor (16) which is in particular designed as an expansion rod sensor and which is preferably thermally insulated via an insulation layer with respect to the radiant heater (7), in particular into the inner shell (5 ) is embedded.
EP87107772A 1986-07-03 1987-05-28 Radiant heating element Expired - Lifetime EP0250880B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87107772T ATE69495T1 (en) 1986-07-03 1987-05-28 RADIANT HEATER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3622415 1986-07-03
DE19863622415 DE3622415A1 (en) 1986-07-03 1986-07-03 BEAM RADIATOR

Publications (4)

Publication Number Publication Date
EP0250880A2 true EP0250880A2 (en) 1988-01-07
EP0250880A3 EP0250880A3 (en) 1989-02-08
EP0250880B1 EP0250880B1 (en) 1991-11-13
EP0250880B2 EP0250880B2 (en) 1997-04-23

Family

ID=6304342

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87107772A Expired - Lifetime EP0250880B2 (en) 1986-07-03 1987-05-28 Radiant heating element

Country Status (8)

Country Link
US (1) US4810857A (en)
EP (1) EP0250880B2 (en)
JP (1) JPS6366891A (en)
AT (1) ATE69495T1 (en)
AU (1) AU596673B2 (en)
DE (2) DE3622415A1 (en)
ES (1) ES2027255T3 (en)
YU (1) YU107487A (en)

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EP0337147A2 (en) * 1988-04-15 1989-10-18 E.G.O. Elektro-Geräte Blanc u. Fischer Radiant heating element
DE3908599A1 (en) * 1989-03-16 1990-09-20 Ako Werke Gmbh & Co RADIATION HEATING DEVICE
WO2007131852A1 (en) * 2006-05-15 2007-11-22 BSH Bosch und Siemens Hausgeräte GmbH Apparatus for controlling radiation heating elements

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DE4039501A1 (en) * 1990-12-11 1992-06-17 Ego Elektro Blanc & Fischer ELECTRIC RADIATOR, IN PARTICULAR RADIANT RADIATOR
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EP0337147A3 (en) * 1988-04-15 1990-12-05 E.G.O. Elektro-Geräte Blanc u. Fischer Radiant heating element
DE3908599A1 (en) * 1989-03-16 1990-09-20 Ako Werke Gmbh & Co RADIATION HEATING DEVICE
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Also Published As

Publication number Publication date
EP0250880B1 (en) 1991-11-13
ATE69495T1 (en) 1991-11-15
AU596673B2 (en) 1990-05-10
EP0250880B2 (en) 1997-04-23
JPS6366891A (en) 1988-03-25
DE3774497D1 (en) 1991-12-19
AU7520687A (en) 1988-01-07
US4810857A (en) 1989-03-07
EP0250880A3 (en) 1989-02-08
DE3622415A1 (en) 1988-01-07
YU107487A (en) 1989-12-31
ES2027255T3 (en) 1992-06-01

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