EP0927428B1 - Radiant heating element for a cooking area - Google Patents

Radiant heating element for a cooking area Download PDF

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Publication number
EP0927428B1
EP0927428B1 EP97944881A EP97944881A EP0927428B1 EP 0927428 B1 EP0927428 B1 EP 0927428B1 EP 97944881 A EP97944881 A EP 97944881A EP 97944881 A EP97944881 A EP 97944881A EP 0927428 B1 EP0927428 B1 EP 0927428B1
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EP
European Patent Office
Prior art keywords
bimetal
pot
radiant heating
heating unit
unit according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97944881A
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German (de)
French (fr)
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EP0927428A1 (en
Inventor
Winfried Leiprecht
Rudolf Gottschling
Silvia Emtmann
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.)
Diehl AKO Stiftung and Co KG
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Diehl AKO Stiftung and Co KG
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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
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0202—Switches
    • H05B1/0213—Switches using bimetallic elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/04—Bases; Housings; Mountings
    • H01H37/043—Mountings on controlled apparatus
    • 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
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/34—Means for transmitting heat thereto, e.g. capsule remote from contact member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
    • 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 a hotplate according to the Preamble of claim 1.
  • Such a radiant heater with a temperature control device is by DE 32 47 028 A1 discloses. Between the radiant heater and one Glass ceramic cooktop is a rod-shaped temperature sensor arranged as Heat transfer element formed and with at least one temperature switch is thermally coupled.
  • the temperature switch is a commercially available one Bimetal switch with a bimetal spring washer. It is a indirect coupling of the bimetal element to the room above the heating conductor.
  • DE 89 14 470 U1 is a control device for an electric heating unit known in which an elongated, thermally conductive sensor by a Opening in the ring edge of the insulating base carrying the heating conductor is led out.
  • a bimetallic strip connects to the sensor at the outer end, the is in active contact with a switch. This example also only reveals an indirect coupling of the bimetal strip via the elongated sensor with the air space above the heating conductor.
  • the built-in safety temperature limiter serves to protect the Glass ceramic plate against overheating.
  • Such an expansion rod regulator is a complex one and therefore expensive component.
  • the arrangement of the expansion rod a correspondingly high overall height of the radiant heater in the air space.
  • the object of the invention is a radiant heater to propose the type mentioned at the beginning, in which small switching hysteresis of An expansion rod does not limit the safety temperature is required.
  • the above object is characterized by the features of characterizing part of claim 1 solved.
  • the bimetal switch component is an inexpensive one Component and leads to a sufficient in a simple manner small switching hysteresis, since it quickly changes to that of Heating element outgoing heat radiation reacts. So that is also a large overshoot of the temperature over one Limit value avoided.
  • Another advantage of the arrangement of the bimetal switch component is that there are several simple ways that Set or close the response temperature of the bimetal adjust.
  • a structural advantage is that the bimetal switch component to the height of the radiant heater has practically no influence because it is not in the Air space between the insulating floor and glass ceramic plate extends.
  • the temperature at which the Bimetal element appeals is greater than 300 ° C. With that Influences of the ambient temperature of the Radiant heater largely suppressed.
  • Bimetal switch component the function of an adjustable Integrated energy regulator. This is what the Bimetallic element or one of these actuable Switching contact an adjusting element in connection with which the response temperature of the bimetal element is adjustable is.
  • a radiant heater has a pot (1) in which an insulating base (2) made of thermal and electrical insulating material is introduced. There is a in the pot (1) thermally and electrically insulating ring edge provided that in the embodiments of a separate ring part (3) is formed. At the Embodiment according to Figure 1, 2 could Insulating base (2) and the ring rim also in one piece be trained. Between the insulating floor (2) and one can be placed on the radiant heater Glass ceramic plate (4) there is an air space (5) in which a heating element (6) which is visible during operation is. In the embodiments is as a heating element a spirally laid heating coil is shown. It can but also other radiant heating elements, for example from flat wire or heating conductor foil or Halogen spotlights can be provided. Outside on the pot (1) there is a connection base (7) for the electrical Connection of the heating element (6).
  • a bimetal switch component (8) is used as the safety temperature limiter provided its ceramic housing (9) completed by a metallic base plate (10) is.
  • a bimetallic element is located inside the housing (9) (11) on the base plate (10) in a heat-conducting manner.
  • the Bimetal element (11) can be designed as a spring washer his.
  • the bimetallic element (11) is above a Ceramic pin (12) which is mounted in a guide (13), with an electrical switch contact (14) in Operatively connected. Power connections (15) of the switch contact (14) are led outwards from the housing (9) (cf. Figure 3).
  • the housing (9) is on both sides at a distance from the Base plate (10) grooves (16) with which the housing (9) can be inserted into a cutout (17) of the pot (1), the edges of the cutout (17) in the grooves (16) intervention.
  • the switch component (8) is open easily set on the pot (1), being about ceramic housing (9) a thermal decoupling of the Bimetal elements (11) of the usually made of sheet metal and thus heat-conducting pot (1) is reached. It can the bimetal switch component (8) in another way, for example by means of a bracket on the pot (1) be attached.
  • the power connections (15) are outside the pot (1). Brackets (19) hold the base plate (10) on the Housing (9). They do not provide any significant thermal bridges represents.
  • the bimetallic element (11) is provided.
  • the Base plate (10) a heat conducting piece (22) is formed.
  • This has a leg (23) which is characterized by a between the ring part (3) and the insulating base (2) existing opening (24) extends.
  • On the thigh (23) is followed by a leg (25) in the Air space (5) next to the heating element (6).
  • the thigh (25) is about where in the embodiment according to Figures 1 and 2, the opening (20).
  • the heat conducting piece (22) can be made in one piece with the Base plate (10) may be formed or as a separate part be attached to this.
  • the bimetal temperature at which the bimetal element (11) switches is preferably in the range between 300 ° C and 500 ° C. Choosing such a high temperature is convenient because then the ambient temperature of the pot (1) Switching behavior hardly influenced.
  • the coupling measures described can also be Switching hysteresis of the switching contact (14) on one hold the desired small value, for example 30 K.
  • the bimetal switch component (8) can also be a second one Have switching contact (26) of the bimetallic element (11) or another bimetallic element (11), optionally a further bimetallic switch component (8) is controllable.
  • This second Switch contact (26) can be a known one optical residual heat indicator, for example a Glow lamp (27), control (see Fig. 8). It can on that Pot (1) in the manner described also two bimetal switch components be arranged, one of which Safety temperature limitation is used and the other one a lower temperature, for example less than 100 ° C, for which the residual heat indicator is adjusted.
  • the bimetal switch component (8) a rotatable adjusting member (28), with a user-operated twist grip connected is.
  • the bimetal element (11) or the switching contact (14) acts, the temperature at which the Switching contact (14) or a third switching contact (29) (see Fig. 8) below the limit temperature of the Open and adjust the glass ceramic plate (4). It is with it through the bimetal switch component (8) next to the function the safety temperature limit also the function of the Energy control for the cooktop with small Switching hysteresis and low overshoot reached.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Control Of Resistance Heating (AREA)
  • Electric Stoves And Ranges (AREA)
  • Cookers (AREA)
  • Resistance Heating (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Control Of Temperature (AREA)
  • Baking, Grill, Roasting (AREA)

Abstract

PCT No. PCT/EP97/05056 Sec. 371 Date Jun. 4, 1999 Sec. 102(e) Date Jun. 4, 1999 PCT Filed Sep. 16, 1997 PCT Pub. No. WO98/12724 PCT Pub. Date Mar. 26, 1998In a radiant heating body for a cooking location, in particular in the case of a glass ceramic plate (4), an insulating bottom (2) with an insulating annular rim portion (3) is provided in a pot member (1). A heating element (6) is arranged in an air space (5) above the insulating bottom (2). A safety temperature limiter is provided on the pot member (1). In order to achieve a low degree of switching hysteresis and to avoid an expansion bar regulator, the safety temperature limiter is in the form of a bimetal switch component (8) having a housing (9) which is fixed to the pot member (1) and in which a bimetal element (11) is disposed at the side: towards the air space (5). Provided at the annular rim portion (3) is an opening (20, 24) through which the bimetal element (11) is thermally coupled directly or indirectly to the air space (5).

Description

Die Erfindung betrifft einen Strahlungsheizkörper für eine Kochstelle nach dem Oberbegriff von Patentanspruch 1.The invention relates to a radiant heater for a hotplate according to the Preamble of claim 1.

Ein solcher Strahlungsheizkörper mit einer Temperaturregeleinrichtung wird durch die DE 32 47 028 A1 offenbart. Zwischen dem Strahlungsheizkörper und einer Glaskeramik-Kochfläche ist ein stabförmiger Temperaturfühler angeordnet, der als Wärmeübertragungselement ausgebildet und mit mindestens einem Temperaturschalter wärmemäßig gekoppelt ist. Der Temperaturschalter ist ein handelsüblicher Bimetall-Schalter mit einer Bimetall-Sprungscheibe. Es handelt sich hierbei um eine indirekte Kopplung des Bimetall-Elementes mit dem Raum über dem Heizleiter.Such a radiant heater with a temperature control device is by DE 32 47 028 A1 discloses. Between the radiant heater and one Glass ceramic cooktop is a rod-shaped temperature sensor arranged as Heat transfer element formed and with at least one temperature switch is thermally coupled. The temperature switch is a commercially available one Bimetal switch with a bimetal spring washer. It is a indirect coupling of the bimetal element to the room above the heating conductor.

Durch die DE 89 14 470 U1 ist eine Steuereinrichtung für eine elektrische Heizeinheit bekannt, bei welcher ein langgestreckter, wärmeleitender Fühler durch eine Öffnung im Ringrand des den Heizleiter tragenden Isolierbodens herausgeführt ist. An dem Fühler schließt am außenliegenden Stirnende ein Bimetallstreifen an, der mit einem Schalter in Wirkkontakt steht. Auch dieses Beispiel offenbart lediglich eine indirekte Koppelung des Bimetall-Streifens über den langgestreckten Fühler mit dem Luftraum oberhalb des Heizleiters.DE 89 14 470 U1 is a control device for an electric heating unit known in which an elongated, thermally conductive sensor by a Opening in the ring edge of the insulating base carrying the heating conductor is led out. A bimetallic strip connects to the sensor at the outer end, the is in active contact with a switch. This example also only reveals an indirect coupling of the bimetal strip via the elongated sensor with the air space above the heating conductor.

Ein anderer Strahlungsheizkörper ist beispielsweise in der DE 35 36 981 C2 beschrieben. Der eingebaute Sicherheitstemperaturbegrenzer dient dem Schutz der Glaskeramikplatte vor Überhitzung. Der Sicherheitstemperaturbegrenzer weist üblicherweise in einer Röhre einen Ausdehnungsstab auf, der sich in dem Luftraum über dem Heizelement erstreckt. Ein solcher Ausdehnungsstabregler ist ein aufwendiges und damit teueres Bauteil. Außerdem bedingt die Anordnung des Ausdehnungsstabs im Luftraum eine entsprechend große Bauhöhe des Strahlungsheizkörpers.Another radiant heater is described for example in DE 35 36 981 C2. The built-in safety temperature limiter serves to protect the Glass ceramic plate against overheating. The safety temperature limiter points usually an expansion rod in a tube that is in the air space extends over the heating element. Such an expansion rod regulator is a complex one and therefore expensive component. In addition, the arrangement of the expansion rod a correspondingly high overall height of the radiant heater in the air space.

In der Literaturstelle HEA-Bilderdienst 6.2, August 1983, S. 17, 18 ist eine Glaskeramik-Kochzone mit einem Energieregler und einem Bimetallregler, der sich seitlich am Strahlungsheizkörper befindet, beschrieben. Zum Ankochen ist der Bimetallregler geschlossen. Bei einer Kochzonen-Temperatur von etwa 125°C öffnet der Bimetallregler. Die Sicherheitstemperaturbegrenzung erfolgt auch hier mittels des Ausdehnungsstabfühlers des Energiereglers.In the literature reference HEA picture service 6.2, August 1983, pp. 17, 18 there is a glass ceramic cooking zone with an energy regulator and a bimetal regulator that located on the side of the radiant heater. The bimetal regulator is for boiling closed. Opens at a cooking zone temperature of around 125 ° C the bimetal controller. The safety temperature is also limited here the expansion rod sensor of the Energy regulator.

Aufgabe der Erfindung ist es, einen Strahlungsheizkörper der eingangs genannten Art vorzuschlagen, bei dem bei kleiner Schalthysterese der Sicherheitstemperaturbegrenzung ein Ausdehnungsstab nicht erforderlich ist.The object of the invention is a radiant heater to propose the type mentioned at the beginning, in which small switching hysteresis of An expansion rod does not limit the safety temperature is required.

Erfindungsgemäß ist obige Aufgabe durch die Merkmale des kennzeichnenden Teils des Anspruchs 1 gelöst.According to the invention, the above object is characterized by the features of characterizing part of claim 1 solved.

Das Bimetall-Schalterbauteil ist ein kostengünstiges Bauteil und führt in einfacher Weise zu einer hinreichend kleinen Schalthysterese, da es schnell auf die vom Heizelement ausgehende Wärmestrahlung reagiert. Damit ist auch ein weites Überschwingen der Temperatur über einen Grenzwert vermieden. Ein weiterer Vorteil der Anordnung des Bimetall-Schalterbauteils besteht darin, daß verschiedene einfache Möglichkeiten bestehen, die Ansprechtemperatur des Bimetalls einzustellen bzw. zu justieren.The bimetal switch component is an inexpensive one Component and leads to a sufficient in a simple manner small switching hysteresis, since it quickly changes to that of Heating element outgoing heat radiation reacts. So that is also a large overshoot of the temperature over one Limit value avoided. Another advantage of the arrangement of the bimetal switch component is that there are several simple ways that Set or close the response temperature of the bimetal adjust.

Ein baulicher Vorteil besteht darin, daß das Bimetall-Schalterbauteil auf die Bauhöhe des Strahlungsheizkörpers praktisch keinen Einfluß hat, weil es sich nicht in dem Luftraum zwischen dem Isolierboden und Glaskeramikplatte erstreckt.A structural advantage is that the bimetal switch component to the height of the radiant heater has practically no influence because it is not in the Air space between the insulating floor and glass ceramic plate extends.

Vorzugsweise ist die Temperatur, bei der das Bimetallelement anspricht, größer als 300°C. Damit sind Einflüsse der Umgebungstemperatur des Strahlungsheizkörpers weitgehend unterdrückt.Preferably, the temperature at which the Bimetal element appeals, greater than 300 ° C. With that Influences of the ambient temperature of the Radiant heater largely suppressed.

In bevorzugter Weiterbildung der Erfindung ist in das Bimetall-Schalterbauteil die Funktion eines einstellbaren Energiereglers integriert. Hierfür steht mit dem Bimetallelement oder einem von diesem betätigbaren Schaltkontakt ein Einstellglied in Verbindung, mit dem die Ansprechtemperatur des Bimetallelements einstellbar ist.In a preferred development of the invention Bimetal switch component the function of an adjustable Integrated energy regulator. This is what the Bimetallic element or one of these actuable Switching contact an adjusting element in connection with which the response temperature of the bimetal element is adjustable is.

Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen und der folgenden Beschreibung von Ausführungsbeispielen. In der Zeichnung zeigen:

  • Figur 1 eine Teilaufsicht eines Strahlungsheizkörpers mit einem Bimetall-Schalterbauteil in einer ersten Ausführung, mit zeichnerisch teilweise aufgebrochenem Ringteil,
  • Figur 2 einen Schnitt längs der Linie II-II nach Fig.1,
  • Figur 3 das Bimetall-Schalterbauteil teilweise geschnitten,
  • Figur 4 eine Ansicht des Bimetall-Schalterbauteils in Richtung des Pfeiles IV nach Fig.3,
  • Figur 5 eine Teilaufsicht eines Strahlungsheizers mit einem Bimetall-Schalterbauteil in einer zweiten Ausführung,
  • Figur 6 einen Schnitt längs der Linie VI-VI nach Fig.5,
  • Figur 7 ein Ausführungsbeispiel mit integrierter Leistungsregelung und
  • Figur 8 einen Schaltplan, schematisch.
    • Further advantageous refinements of the invention result from the subclaims and the following description of exemplary embodiments. The drawing shows:
  • FIG. 1 shows a partial top view of a radiant heater with a bimetal switch component in a first embodiment, with the ring part partially broken open in the drawing,
  • FIG. 2 shows a section along the line II-II according to FIG. 1,
  • FIG. 3 shows the bimetal switch component partially cut,
  • FIG. 4 shows a view of the bimetal switch component in the direction of arrow IV according to FIG. 3,
  • FIG. 5 shows a partial top view of a radiant heater with a bimetal switch component in a second embodiment,
  • FIG. 6 shows a section along the line VI-VI according to FIG. 5,
  • Figure 7 shows an embodiment with integrated power control and
  • Figure 8 is a circuit diagram, schematically.

    • Ein Strahlungsheizkörper weist einen Topf(1) auf, in den ein Isolierboden(2) aus thermisch und elektrisch isolierendem Material eingebracht ist. Im Topf(1) ist ein thermisch und elektrisch isolierender Ringrand vorgesehen, der bei den Ausführungsbeispielen von einem separaten Ringteil(3) gebildet ist. Beim Ausführungsbeispiel nach Figur 1, 2 könnte der Isolierboden(2) und der Ringrand auch einstückig ausgebildet sein. Zwischen dem Isolierboden(2) und einer auf den Strahlungsheizkörper aufsetzbaren Glaskeramikplatte(4) besteht ein Luftraum(5), in dem ein im Betrieb sichtbar strahlendes Heizelement(6) angeordnet ist. Bei den Ausführungsbeispielen ist als Heizelement eine spiralförmig verlegte Heizwendel gezeigt. Es können jedoch auch andere strahlende Heizelemente, beispielsweise aus Flachdraht oder Heizleiterfolie oder Halogenstrahler, vorgesehen sein. Außen am Topf(1) befindet sich ein Anschlußsockel(7) für den elektrischen Anschluß des Heizelements(6).A radiant heater has a pot (1) in which an insulating base (2) made of thermal and electrical insulating material is introduced. There is a in the pot (1) thermally and electrically insulating ring edge provided that in the embodiments of a separate ring part (3) is formed. At the Embodiment according to Figure 1, 2 could Insulating base (2) and the ring rim also in one piece be trained. Between the insulating floor (2) and one can be placed on the radiant heater Glass ceramic plate (4) there is an air space (5) in which a heating element (6) which is visible during operation is. In the embodiments is as a heating element a spirally laid heating coil is shown. It can but also other radiant heating elements, for example from flat wire or heating conductor foil or Halogen spotlights can be provided. Outside on the pot (1) there is a connection base (7) for the electrical Connection of the heating element (6).

    Als Sicherheitstemperaturbegrenzer ist ein Bimetall-Schalterbauteil(8) vorgesehen, dessen keramisches Gehäuse (9) durch eine metallische Grundplatte(10) abgeschlossen ist. Im Innern des Gehäuses(9) liegt ein Bimetallelement (11) wärmeleitend an der Grundplatte(10) an. Das Bimetallelement(11) kann als Sprungscheibe ausgebildet sein. Das Bimetallelement(11) steht über einen Keramikstift(12), der in einer Führung(13) gelagert ist, mit einem elektrischen Schaltkontakt(14) in Wirkverbindung. Stromanschlüsse(15) des Schaltkontakts (14) sind nach außen aus dem Gehäuse(9) geführt (vgl. Fig.3).A bimetal switch component (8) is used as the safety temperature limiter provided its ceramic housing (9) completed by a metallic base plate (10) is. A bimetallic element is located inside the housing (9) (11) on the base plate (10) in a heat-conducting manner. The Bimetal element (11) can be designed as a spring washer his. The bimetallic element (11) is above a Ceramic pin (12) which is mounted in a guide (13), with an electrical switch contact (14) in Operatively connected. Power connections (15) of the switch contact (14) are led outwards from the housing (9) (cf. Figure 3).

    Das Gehäuse(9) weist beidseitig im Abstand von der Grundplatte(10) Nuten(16) auf, mit denen das Gehäuse(9) in einen Ausschnitt(17) des Topfes(1) einsteckbar ist, wobei die Ränder des Ausschnittes(17) in die Nuten(16) eingreifen. Das Schalterbauteil(8) ist dadurch auf einfache Weise am Topf(1) festgelegt, wobei über das keramische Gehäuse(9) eine thermische Entkopplung des Bimetallelements(11) vom gewöhnlich aus Blech bestehenden und damit wärmeleitenden Topf(1) erreicht ist. Es kann das Bimetall-Schalterbauteil(8) auch in anderer Weise, beispielsweise mittels eines Bügels, an dem Topf(1) befestigt sein.The housing (9) is on both sides at a distance from the Base plate (10) grooves (16) with which the housing (9) can be inserted into a cutout (17) of the pot (1), the edges of the cutout (17) in the grooves (16) intervention. The switch component (8) is open easily set on the pot (1), being about ceramic housing (9) a thermal decoupling of the Bimetal elements (11) of the usually made of sheet metal and thus heat-conducting pot (1) is reached. It can the bimetal switch component (8) in another way, for example by means of a bracket on the pot (1) be attached.

    Im montierten Zustand (vgl. Fig.1,2, Fig.5,6,7) liegt die Grundplatte(10) in einer zum Topf(1) hin offenen Aussparung(18), ohne den Topf(1) zu berühren, was die thermische Entkopplung der Grundplatte(10) vom Topf(1) und damit von dessen Umgebungstemperatur begünstigt. Bei einer anderen Ausführung kann die Grundplatte(10) an dem Topf(1) anliegen und/oder an ihm durch Einstecken befestigt sein. Zur thermischen Entkopplung, also schlechten Wärmeankopplung, wird dabei, beispielsweise mittels Noppen oder Sicken, ein punktuelles oder linienförmiges Anliegen gewählt.In the assembled state (cf. Fig. 1,2, Fig. 5,6,7) the Base plate (10) in an open towards the pot (1) Recess (18) without touching the pot (1), which the thermal decoupling of the base plate (10) from the pot (1) and thus favored by its ambient temperature. at another embodiment, the base plate (10) on the Fit the pot (1) and / or by inserting it be attached. For thermal decoupling, that is poor heat coupling, this will, for example by means of knobs or beads, a selective or linear concern chosen.

    Die Stromanschlüsse(15) stehen außerhalb des Topfes(1). Klammern(19) halten die Grundplatte(10) an dem Gehäuse(9). Sie stellen keine wesentlichen Wärmebrücken dar.The power connections (15) are outside the pot (1). Brackets (19) hold the base plate (10) on the Housing (9). They do not provide any significant thermal bridges represents.

    Bei dem Ausführungsbeispiel nach den Figuren 1 und 2 ist eine direkte thermische Kopplung zwischen dem wärmeleitend mit der Grundplatte(10) verbundenen Bimetallelement(11) und dem Luftraum(5) gewählt. Hierfür weist das Ringteil(3) im Bereich der Grundplatte(10) und damit des Bimetallelements(11) eine Durchbrechung(20) auf. Durch diese trifft vom Heizelement(6) ausgehende Wärmestrahlung direkt auf die Grundplatte(10). Ist eine noch direktere Ankopplung gewünscht, dann kann die Grundplatte(10) im Bereich des Bimetallelements(11) eine oder mehrere Öffnungen aufweisen. In Figur 4 ist eine solche öffnung(21) gezeigt.In the embodiment of Figures 1 and 2 is a direct thermal coupling between the thermally connected to the base plate (10) Bimetallic element (11) and the air space (5) selected. Therefor has the ring part (3) in the region of the base plate (10) and thus an opening (20) of the bimetal element (11) on. Through this hits from the heating element (6) Heat radiation directly on the base plate (10). Is a If you want an even more direct connection, then the Base plate (10) in the area of the bimetal element (11) or have several openings. In Figure 4 is one such opening (21) is shown.

    Beim Ausführungsbeispiel nach den Figuren 5 und 6 ist eine indirekte thermische Ankopplung des Luftraums(5) an das Bimetallelement(11) vorgesehen. Hierfür ist an der Grundplatte(10) ein Wärmeleitstück(22) ausgebildet. Dieses weist einen Schenkel(23) auf, der sich durch eine zwischen dem Ringteil(3) und dem Isolierboden(2) bestehende Durchbrechung(24) erstreckt. An den Schenkel (23) schließt sich ein Schenkel(25) an, der in dem Luftraum(5) neben dem Heizelement(6) liegt. Der Schenkel (25) liegt etwa dort, wo sich beim Ausführungsbeispiel nach den Figuren 1 und 2 die Durchbrechung(20) befindet. Das Wärmeleitstück(22) kann einstückig mit der Grundplatte(10) ausgebildet sein oder als separates Teil an dieser befestigt sein.In the embodiment of Figures 5 and 6 is an indirect thermal coupling of the air space (5) the bimetallic element (11) is provided. For this is on the Base plate (10) a heat conducting piece (22) is formed. This has a leg (23) which is characterized by a between the ring part (3) and the insulating base (2) existing opening (24) extends. On the thigh (23) is followed by a leg (25) in the Air space (5) next to the heating element (6). The thigh (25) is about where in the embodiment according to Figures 1 and 2, the opening (20). The heat conducting piece (22) can be made in one piece with the Base plate (10) may be formed or as a separate part be attached to this.

    Die Aufnahme der vom Heizelement(6) ausgehenden Wärmestrahlung läßt sich dadurch verbessern, daß der Schenkel(25) - beim Ausführungsbeispiel nach Figur 5,6 - oder die Grundplatte(10) - beim Ausführungsbeispiel nach den Figuren 1,2 - an der dem Heizelement(6) zugewandten Oberfläche gefärbt, vorzugsweise geschwärzt, mattiert und/oder aufgerauht ist. Beim Ausführungsbeispiel nach den Figuren 1 und 2 ist zusätzlich auch das Bimetallelement(11) selbst gegenüber der Öffnung(21) gefärbt, vorzugsweise geschwärzt und/oder mattiert. Um ein schnelles Reagieren des Bimetallelements(11) auf die Strahlungswärme des Heizelements(6) zu erreichen, ist es auch vorteilhaft, wenn die der Strahlung ausgesetzte Oberfläche des Schenkels(25) oder der Grundplatte(10) groß ist, das Wärmeleitstück(22) bzw. die Grundplatte(10) eine geringe Masse aufweist und aus einem gut wärmeleitenden Material besteht.The inclusion of the starting from the heating element (6) Heat radiation can be improved in that the Leg (25) - in the embodiment of Figure 5.6 - or the base plate (10) - in the embodiment according to Figures 1,2 - on the heating element (6) facing Colored surface, preferably blackened, matted and / or is roughened. In the embodiment according to Figures 1 and 2 is also that Bimetal element (11) itself opposite the opening (21) colored, preferably blackened and / or matted. Around a quick reaction of the bimetal element (11) to the To achieve radiant heat from the heating element (6) also advantageous when exposed to radiation Surface of the leg (25) or the base plate (10) is large, the heat conducting piece (22) or the base plate (10) has a low mass and is good heat-conducting material.

    Die Bimetalltemperatur, bei der das Bimetallelement(11) schaltet, liegt bevorzugt im Bereich zwischen 300°C und 500°C. Eine so hohe Temperatur zu wählen ist günstig, weil dann die Umgebungstemperatur des Topfes(1) das Schaltverhalten kaum mehr beeinflußt. Durch die beschriebenen direkten oder indirekten Ankopplungsmaßnahmen ist es möglich, die Abstimmung so vorzunehmen, daß das Bimetall bei einer für die Glaskeramikplatte(4) kritischen Temperatur, die bei einem bestimmten Grenzwert, je nach Ausführung zwischen 530°C und 630°C an der Oberseite der Glaskeramikplatte, liegt, den Schaltkontakt(14) sicher öffnet, ohne daß es zu einem zu großen Überschwingen der Grenztemperatur kommt. Durch die beschriebenen Ankopplungsmaßnahmen läßt sich auch Schalthysterese des Schaltkontakts(14) auf einem gewünschten kleinen Wert, beispielsweise 30 K, halten.The bimetal temperature at which the bimetal element (11) switches, is preferably in the range between 300 ° C and 500 ° C. Choosing such a high temperature is convenient because then the ambient temperature of the pot (1) Switching behavior hardly influenced. Through the described direct or indirect Coupling measures, it is possible to vote this way make that the bimetal at one for the Glass ceramic plate (4) critical temperature at a certain limit, depending on the version between 530 ° C and 630 ° C on the top of the glass ceramic plate, the switch contact (14) opens safely without it there is a large overshoot of the limit temperature. By the coupling measures described can also be Switching hysteresis of the switching contact (14) on one hold the desired small value, for example 30 K.

    Das Öffnen des Schaltkontakts(14) bei der Grenztemperatur der Glaskeramikplatte(4) läßt sich außer durch die beschriebenen Maßnahmen auch noch dadurch beeinflussen, daß

  • a) das Bimetallelement(11) entsprechend vorverformt wird,
  • b) der Abstand der Grundplatte(10) bzw. des Bimetallelements(11) von dem Heizelement(6) geeignet gewählt wird,
  • c) die Größe der Durchbrechung(20) entsprechend bemessen wird,
  • d) die Lage der Grundplatte(10) bzw. des Bimetallelements (11) auf den heißesten Bereich des Heizelements(6) bezogen wird.
    • The opening of the switching contact (14) at the limit temperature of the glass ceramic plate (4) can be influenced in addition to the measures described in that
  • a) the bimetal element (11) is pre-deformed accordingly,
  • b) the distance between the base plate (10) or the bimetal element (11) from the heating element (6) is suitably chosen,
  • c) the size of the opening (20) is dimensioned accordingly,
  • d) the position of the base plate (10) or the bimetal element (11) is related to the hottest area of the heating element (6).

    • Das Bimetall-Schalterbauteil(8) kann auch einen zweiten Schaltkontakt(26) aufweisen, der von dem Bimetallelement (11) oder einem weiteren Bimetallelement(11), gegebenenfalls eines weiteren Bimetall-Schalterbauteils(8) steuerbar ist. Mit diesem zweiten Schaltkontakt(26) läßt sich eine an sich bekannte optische Restwärmeanzeige, beispielsweise eine Glimmlampe(27), steuern (vgl. Fig.8). Es können an dem Topf(1) in der beschriebenen Weise auch zwei Bimetall-Schalterbauteile angeordnet sein, wobei das eine der Sicherheitstemperaturbegrenzung dient und das andere auf eine niedrigere Temperatur, beispielsweise kleiner als 100°C, für die Restwärmeanzeige justiert ist.The bimetal switch component (8) can also be a second one Have switching contact (26) of the bimetallic element (11) or another bimetallic element (11), optionally a further bimetallic switch component (8) is controllable. With this second Switch contact (26) can be a known one optical residual heat indicator, for example a Glow lamp (27), control (see Fig. 8). It can on that Pot (1) in the manner described also two bimetal switch components be arranged, one of which Safety temperature limitation is used and the other one a lower temperature, for example less than 100 ° C, for which the residual heat indicator is adjusted.

    Beim Ausführungsbeispiel nach Figur 7 weist das Bimetall-Schalterbauteil(8) ein drehbares Einstellglied(28) auf, das mit einem vom Benutzer betätigbaren Drehgriff verbunden ist. Mittels des Einstellgliedes(28), das auf das Bimetallelement(11) oder den Schaltkontakt(14) einwirkt, läßt sich die Temperatur, bei der der Schaltkontakt(14) oder ein dritter Schaltkontakt(29) (vgl. Fig.8) unterhalb der Grenztemperatur der Glaskeramikplatte(4) öffnet, einstellen. Es ist damit durch das Bimetall-Schalterbauteil(8) neben der Funktion der Sicherheitstemperaturbegrenzung auch die Funktion der Energieregelung für das Kochfeld mit kleiner Schalthysterese und geringem überschwingen erreicht.In the exemplary embodiment according to FIG. 7, the bimetal switch component (8) a rotatable adjusting member (28), with a user-operated twist grip connected is. By means of the adjusting member (28), the the bimetal element (11) or the switching contact (14) acts, the temperature at which the Switching contact (14) or a third switching contact (29) (see Fig. 8) below the limit temperature of the Open and adjust the glass ceramic plate (4). It is with it through the bimetal switch component (8) next to the function the safety temperature limit also the function of the Energy control for the cooktop with small Switching hysteresis and low overshoot reached.

    Claims (10)

    1. A radiant heating unit for a hotplate, having a glass ceramic plate (4) and an insulating base (2) disposed underneath the glass ceramic plate (4) with formation of an air space, said insulating base (2) being inserted with an insulating annular rim (3) in a pot (1) and accommodating a heating element (6), and a safety temperature limiter also being provided on the pot (1), said safety temperature limiter taking the form of a bimetal switch component (8),
      characterized in that,
      in a metal base plate (10) of the housing (9) of the bimetal switch component (8), said housing (9) being fixed to the pot (1), a bimetal element (11) is provided in a heat-conducting capacity on the side facing the air space (5), said bimetal element (11) being thermally connected directly or indirectly to the air space (5) through an opening (20, 24) provided in the annular rim (3), and the base plate (10) inside the pot (1) being disposed between the pot (1) and the annular rim (3) without touching the pot (1) or only resting against the pot (1) with point or line contact, and the supply terminals (15) of the switching contact (14) of the bimetal switch component (8) being located outside of the pot (1).
    2. A radiant heating unit according to Claim 1,
      characterized in that
      the base plate (10) has one or more openings (21) in the region of the bimetal element (11).
    3. A radiant heating unit according to one of Claims 1 or 2,
      characterized in that
      on the base plate (10) a heat-conducting component (22) is formed or fixed which extends through the opening (24) into the air space (5).
    4. A radiant heating unit according to Claim 3,
      characterized in that,
      relative to the plane of the cooking zone, the heat-conducting component (22) in the air space (5) is located next to the heating element (6).
    5. A radiant heating unit according to one of Claims 1 to 4,
      characterized in that,
      in respect of the surface facing the air space (5) and the heating element (6), the base plate (10) and/or the bimetal element (11) or the heat-conducting component (22) is coloured, preferably blackened, made matt and/or roughened for purposes of improving the absorption of the radiant heat emanating from the heating element (6).
    6. A radiant heating unit according to one of the preceding claims,
      characterized in that
      the bimetal element (11) switches at a temperature above 250°C.
    7. A radiant heating unit according to one of the preceding claims,
      characterized in that
      the ceramic housing (9) of the bimetal switch component (8) is inserted by means of grooves (16) into an aperture (17) in the pot (1).
    8. A radiant heating unit according to one of the preceding claims,
      characterized in that
      a regulating member (28) for regulating the power is connected to the bimetal element (11) or to the switching contact (14, 29) which can be operated by this bimetal element (11).
    9. A radiant heating unit according to one of the preceding claims,
      characterized in that
      the bimetal switch component (8) has a second switching contact for a residual-heat display of less than 100°C.
    10. A radiant heating unit according to one of the preceding claims,
      characterized in that
      an additional bimetal switch component with a switching contact for the residual-heat display is provided on the pot (1), the bimetal element for the residual-heat display switching at a temperature of less than 100°C.
    EP97944881A 1996-09-20 1997-09-16 Radiant heating element for a cooking area Expired - Lifetime EP0927428B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    DE19638517A DE19638517A1 (en) 1996-09-20 1996-09-20 Radiant heater for a hotplate
    DE19638517 1996-09-20
    PCT/EP1997/005056 WO1998012724A1 (en) 1996-09-20 1997-09-16 Radiant heating element for a cooking area

    Publications (2)

    Publication Number Publication Date
    EP0927428A1 EP0927428A1 (en) 1999-07-07
    EP0927428B1 true EP0927428B1 (en) 2002-04-03

    Family

    ID=7806304

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP97944881A Expired - Lifetime EP0927428B1 (en) 1996-09-20 1997-09-16 Radiant heating element for a cooking area

    Country Status (11)

    Country Link
    US (1) US6121587A (en)
    EP (1) EP0927428B1 (en)
    JP (1) JP2001507500A (en)
    AT (1) ATE215731T1 (en)
    AU (1) AU745337B2 (en)
    CA (1) CA2265783C (en)
    CZ (1) CZ91899A3 (en)
    DE (2) DE19638517A1 (en)
    ES (1) ES2175472T3 (en)
    PL (1) PL332315A1 (en)
    WO (1) WO1998012724A1 (en)

    Families Citing this family (13)

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    DE19814985A1 (en) * 1998-04-03 1999-10-07 Ego Elektro Geraetebau Gmbh Heat display switching device e.g. for ceramic cooking hob
    DE19825309A1 (en) * 1998-06-05 1999-12-09 Bsh Bosch Siemens Hausgeraete Radiant heating arrangement with busbars
    DE19852166B4 (en) * 1998-11-12 2006-05-11 Eika, S. Coop. radiant heater
    US6360291B1 (en) * 1999-02-01 2002-03-19 Compaq Computer Corporation System and method for hiding peripheral devices in a computer system
    FR2792158B1 (en) * 1999-04-09 2001-05-18 Jaeger Regulation MODULAR INDUCTION COOKING FIREPLACE WITH REDUCED RADIATION AND METHOD OF MAKING
    GB2361160B (en) * 2000-04-03 2004-11-03 Ceramaspeed Ltd Radiant electric heater
    GB0301167D0 (en) 2003-01-18 2003-02-19 Ceramaspeed Ltd Temperature-limiting device
    ES1057791Y (en) * 2004-06-14 2005-01-01 Eika S Coop RADIANT HEATER IN A COOKING HOB, WITH A THERMAL SWITCH.
    ES1058165Y (en) * 2004-08-05 2005-02-16 Eika S Coop RADIANT HEATER FOR COOKING, WITH AN INSULATING MOLDING BASE.
    DE102004059159A1 (en) * 2004-12-08 2006-06-14 BSH Bosch und Siemens Hausgeräte GmbH Cooking surface comprises heating conductor and controller wherein controller has heating conductor-temperature sensor, which measures the temperature of heating conductor
    US7554060B2 (en) * 2006-09-29 2009-06-30 England Raymond O Displaying cooking-related information
    CN100521831C (en) * 2007-04-11 2009-07-29 佛山市顺德区简氏家用电器厂 Temperature limiter of ceramic cooking ware heater
    DE102021210399A1 (en) * 2021-09-20 2023-03-23 E.G.O. Elektro-Gerätebau GmbH Heating device for a hob and hob with such a heating device

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    Also Published As

    Publication number Publication date
    AU4623197A (en) 1998-04-14
    CA2265783A1 (en) 1998-03-26
    DE59706894D1 (en) 2002-05-08
    CZ91899A3 (en) 1999-07-14
    EP0927428A1 (en) 1999-07-07
    CA2265783C (en) 2004-11-09
    DE19638517A1 (en) 1998-03-26
    PL332315A1 (en) 1999-08-30
    JP2001507500A (en) 2001-06-05
    WO1998012724A1 (en) 1998-03-26
    AU745337B2 (en) 2002-03-21
    US6121587A (en) 2000-09-19
    ES2175472T3 (en) 2002-11-16
    ATE215731T1 (en) 2002-04-15

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