EP0750330A2 - Control arrangement for a radiation heating device for a cooking plate - Google Patents

Control arrangement for a radiation heating device for a cooking plate Download PDF

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Publication number
EP0750330A2
EP0750330A2 EP96107317A EP96107317A EP0750330A2 EP 0750330 A2 EP0750330 A2 EP 0750330A2 EP 96107317 A EP96107317 A EP 96107317A EP 96107317 A EP96107317 A EP 96107317A EP 0750330 A2 EP0750330 A2 EP 0750330A2
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EP
European Patent Office
Prior art keywords
temperature
control device
additional
heater
expansion sensor
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.)
Withdrawn
Application number
EP96107317A
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German (de)
French (fr)
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EP0750330A3 (en
Inventor
Henno Dipl.-Ing. Schotten
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.)
AKO Werke GmbH and Co KG
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AKO Werke GmbH and Co KG
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Application filed by AKO Werke GmbH and Co KG filed Critical AKO Werke GmbH and Co KG
Publication of EP0750330A2 publication Critical patent/EP0750330A2/en
Publication of EP0750330A3 publication Critical patent/EP0750330A3/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0202—Switches
    • H05B1/0216—Switches actuated by the expansion of a solid element, e.g. wire or rod
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/12—Means for adjustment of "on" or "off" operating temperature
    • H01H37/14—Means for adjustment of "on" or "off" operating temperature by anticipatory electric heater
    • 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
    • H01H37/46—Thermally-sensitive members actuated due to expansion or contraction of a solid
    • H01H37/48—Thermally-sensitive members actuated due to expansion or contraction of a solid with extensible rigid rods or tubes
    • 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
    • H01H2037/326—Thermally-sensitive members with radiative heat transfer to the switch, e.g. special absorption surfaces

Definitions

  • the invention relates to a control device for a hotplate radiant heating, wherein an electric radiant heater is arranged under the hotplate, in the effective area of which a rod-shaped expansion sensor is provided, which actuates a mechanical switch contact at an upper limit temperature and thereby switches off the radiator (switch-off temperature).
  • the expansion sensor extends between the glass ceramic hotplate and the radiant heater.
  • the expansion sensor consists of a quartz glass tube in which a temperature-dependent expanding wire (DE 27 48 109 A1) or rod (DE 31 00 758 A1) is arranged, which acts on the mechanical switch contact. If an upper limit temperature is reached, the radiator is switched off. It is switched on again after cooling.
  • an adjustable energy control device In the case of hot plates whose temperature should be adjustable by the user, an adjustable energy control device must be provided in addition to the switching device mentioned. This "clocks" the radiant heater with shorter or longer breaks.
  • DE 28 50 389 C2 describes a temperature controller with a liquid-filled expansion element for a hotplate, by means of which the "clocking" is to be improved.
  • An additional, heatable expansion element is arranged outside the effective range of the radiator.
  • the object of the invention is to develop a switching device of the known type so that the function of an energy regulator is integrated into it, so that the user has the option of choosing a desired temperature.
  • the above object is achieved in a control device of the type mentioned at the outset in that the expansion sensor is within the range of influence of an additional heating element and that a control circuit for the output of the additional heating element is provided, which can be adjusted by means of a manually actuated actuator, the output of the additional heating element in one The range can be adjusted so that the additional heating element brings the expansion sensor to the switch-off temperature when the temperature of the hotplate is lower than the upper limit temperature.
  • the radiant heater heats the hotplate and the expansion sensor. If the additional heating element is not switched on, the expansion sensor switches off the radiant heating element in the usual way via the mechanical switch contact when the limit temperature is reached. If the additional heating element is switched on, it also heats the expansion sensor without significantly heating the hotplate. The switch-off temperature of the expansion sensor is therefore already reached when the hotplate is at a lower temperature. The switch-off point is therefore shifted to lower hotplate temperatures.
  • the user has the option of setting the respective power with which the additional heating element works by means of the actuator. So he can choose a desired hotplate temperature in the end result.
  • the control circuit for setting the output of the additional heating element can be a step switch, a phase control or a pulse packet control.
  • the output of the additional radiator is significantly less than the output of the radiant heater.
  • the output of the additional heating element is preferably so small and / or its assignment to the expansion sensor that it does not prevent the expansion sensor from reaching the switch-on temperature when the radiation heating element is switched off, even when it is working at full output. This ensures that the radiant heater "clocks" in the desired manner even when a low cooking temperature is selected. The low cooking temperature is thus maintained for an arbitrarily long time.
  • An electric heating coil (2) is arranged under a glass ceramic plate (1) and is laid in a spiral.
  • a rod-shaped expansion sensor (3) extends between the glass ceramic plate (1) and the heating coil (2).
  • This has a quartz tube (4) in which an expansion rod (5) is arranged.
  • the expansion rod (5) expands in relation to the quartz tube (4) and, when a switch-off temperature is reached, actuates a mechanical switch contact (6) which is mounted in a housing (7) outside the glass ceramic plate (1).
  • the heating coil (2) which is connected to the electrical network (8), can be switched by means of the switching contact (6).
  • An additional electric heater (9) is wound on the quartz tube (4) (see Fig. 1,2).
  • the additional heater (9) could also be arranged separately from the expansion sensor (3) (see Fig. 3,4).
  • the expansion sensor (3) lies in the thermal effective range of the additional heating element (9). It is also possible to lay the additional heating element (9) in the quartz tube (4).
  • the additional heater (9) is connected to the electrical network (8) via a control circuit (10). With the Control circuit (10) is coupled to an actuator (11) which can be actuated by the user.
  • the control circuit (10) is constructed in such a way that the power of the additional heating element (9) is set in accordance with the setting of the actuator (11).
  • the control circuit (10) is, for example, a step switch with which the full mains voltage or part of the mains voltage can be applied to the additional heating element (9).
  • the control circuit (10) can also be a phase control or a pulse packet control.
  • the nominal output of the additional heating element (9) is considerably smaller than that of the heating coil (2); for example, it is a few watts.
  • the additional heating element (9) itself thus makes an insignificant contribution to the heating of the glass ceramic plate (1).
  • the power emitted by it is not lost and does not require any cooling or insulation measures, since it is in the same room as the heating coil (2).
  • the nominal power of the additional heater (9) is so small or its thermal coupling to the expansion sensor (3) is designed so that after the heating coil (2) is switched off, the expansion sensor (3) cools down to such an extent that the switch contact (6 ) can close again, ie the heating coil (2) switches on again, even if the additional heating element (9) is operated at full power.
  • the nominal output of the additional heater (9) is so large or its thermal coupling to the expansion sensor (3) is designed so that the expansion sensor (3) with the heating coil (2) switched on from the additional heater (9) working at full power to the switch-off temperature is brought when the glass ceramic plate (1) has reached the lowest selectable cooking temperature.
  • the expansion sensor (3) and the switch contact (6) are designed so that the heating coil (2) is switched off when - with the additional heating element (9) switched off - the glass ceramic plate (1) has reached the upper limit temperature at which the glass ceramic plate ( 1) Can be damaged.
  • the additional heating element (9) remains switched off.
  • the heating coil (2) alone heats the expansion sensor (3).
  • the expansion rod (5) switches the switch contact (6), which is usually a snap switch, so that the heating coil (2) is switched off. After cooling, the switch contact (6) closes again.
  • the additional heater (9) works with a corresponding partial output and heats the expansion sensor (3), which is also heated by the heating coil (2) that is switched on.
  • the switch-off temperature of the expansion sensor (3) is now reached at a corresponding earlier point in time.
  • the glass ceramic plate (1) has the set target temperature.
  • the heating coil (2) is switched off.
  • the additional heater (9) is still switched on.
  • the expansion sensor (3) then cools down because the additional heating element (9) alone cannot keep it at the switch-off temperature.
  • the switch contact (6) then closes again and the glass ceramic plate (1) is kept "clocked" at the set target temperature.
  • the additional heating element (9) works continuously at full output. After reaching the Setpoint temperature and switching off the heating coil (2) reduces the temperature of the expansion sensor (3) despite the additional heater (9) working at full power to such an extent that the switch contact (6) closes again and thus switches the heating coil (2) back on.
  • the expansion sensor (3) works in conjunction with the switch contact (6) as a safety temperature limiter.
  • the additional heater (9) is arranged like the heating coil (2) on an insulating support.
  • the coiled additional heating element (9) is - based on the glass ceramic plate (1) - below the expansion sensor (3).
  • an additional heating element (9) is wound on the quartz tube (4) of the expansion sensor (3).
  • Another additional radiator (9) - similar to that in Figure 3 - is arranged below the expansion sensor (3).
  • the two additional radiators (9) can be switched individually or together, and they can be electrically connected in parallel or in series. With this arrangement, the influence of the additional radiators (9) on the expansion sensor (3) can be varied within wide limits.
  • control circuit (10) with the actuator (11) and the housing (7) carrying the expansion sensor (3) into one structural unit.
  • a structurally compact control device is thus created, which has both the function of a safety temperature limiter and the function of an energy regulator.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Electric Stoves And Ranges (AREA)
  • Control Of Resistance Heating (AREA)

Abstract

The regulator controls the heating of a cooker hot-plate by radiation. An electric radiation heater coil (2) is arranged under the glass ceramic hot plate (1). A rod type expansion probe (3) is provided in the effective range of the coil (2). At an upper temperature (the switch-off temperature), the probe (3) actuates a mechanical switch contact and switches the heater coil (2) off. The probe (3) lies in the effective region of an additional heater (9). A control circuit (10) is provided for the controlling power of the additional heater (9). The control circuit (10) is operated by a manually actuated control member (11). The power of the additional heater (9) is adjustable within a range such that the additional heater (3) brings the probe (3) to the switch off temperature when the temperature of the hot plate (1) is less than the upper threshold temperature. The control circuit (10) is e.g. a stepper switch, a phase switch or a pulse packet controller.

Description

Die Erfindung betrifft eine Regeleinrichtung für eine Kochplatten-Strahlungsbeheizung, wobei unter der Kochplatte ein elektrischer Strahlungsheizkörper angeordnet ist, in dessen Wirkungsbereich ein stabförmiger Ausdehnungsfühler vorgesehen ist, der bei einer oberen Grenztemperatur einen mechanischen Schaltkontakt betätigt und dadurch den Heizkörper abschaltet (Abschalttemperatur).The invention relates to a control device for a hotplate radiant heating, wherein an electric radiant heater is arranged under the hotplate, in the effective area of which a rod-shaped expansion sensor is provided, which actuates a mechanical switch contact at an upper limit temperature and thereby switches off the radiator (switch-off temperature).

Bei solchen Schalteinrichtungen (vgl. DE 27 48 109 A1) erstreckt sich der Ausdehnungsfühler zwischen der Glaskeramik-Kochplatte und dem Strahlungsheizkörper. Der Ausdehnungsfühler besteht aus einem Quarzglasrohr, in dem ein sich temperaturabhängig ausdehnender Draht (DE 27 48 109 A1) oder Stab (DE 31 00 758 A1) angeordnet ist, der auf den mechanischen Schaltkontakt wirkt. Ist eine obere Grenztemperatur erreicht, dann wird der Heizkörper abgeschaltet. Er wird nach Abkühlung wieder eingeschaltet.In such switching devices (cf. DE 27 48 109 A1), the expansion sensor extends between the glass ceramic hotplate and the radiant heater. The expansion sensor consists of a quartz glass tube in which a temperature-dependent expanding wire (DE 27 48 109 A1) or rod (DE 31 00 758 A1) is arranged, which acts on the mechanical switch contact. If an upper limit temperature is reached, the radiator is switched off. It is switched on again after cooling.

In der DE 35 16 621 C2 ist eine besondere Gestaltung der Mechanik der Schalteinrichtung beschrieben. Zur Justierung der Abschalttemperatur ist eine Justierschraube vorgesehen.DE 35 16 621 C2 describes a special design of the mechanics of the switching device. To adjust the switch-off temperature is a Adjustment screw provided.

Diese bekannten Schalteinrichtungen dienen zur Temperaturbegrenzung und verhindern, daß an der Glaskeramikplatte und dem Heizkörper schädliche Temperaturen entstehen. Für den Benutzer besteht keine Möglichkeit, die Temperatur der Kochplatte zu wählen.These known switching devices serve to limit the temperature and prevent harmful temperatures from occurring on the glass ceramic plate and the radiator. There is no possibility for the user to choose the temperature of the hotplate.

Bei Kochplatten, deren Temperatur vom Benutzer einstellbar sein soll, ist zusätzlich zur genannten Schalteinrichtung eine einstellbare Energiesteuereinrichtung vorzusehen. Diese "taktet" den Strahlungsheizkörper mit kürzeren oder längeren Pausen.In the case of hot plates whose temperature should be adjustable by the user, an adjustable energy control device must be provided in addition to the switching device mentioned. This "clocks" the radiant heater with shorter or longer breaks.

In der DE 28 50 389 C2 ist ein Temperaturregler mit einem flüssigkeitsgefüllten Ausdehnungsglied für eine Kochplatte beschrieben, durch den das "Takten" verbessert werden soll. Ein zusätzliches, beheizbares Ausdehnungselement ist außerhalb des Wirkungsbereichs des Heizkörpers angeordnet.DE 28 50 389 C2 describes a temperature controller with a liquid-filled expansion element for a hotplate, by means of which the "clocking" is to be improved. An additional, heatable expansion element is arranged outside the effective range of the radiator.

Aufgabe der Erfindung ist es, eine Schalteinrichtung der bekannten Art so weiterzubilden, daß in sie die Funktion eines Energiereglers integriert ist, so daß der Benutzer die Möglichkeit hat, eine Solltemperatur zu wählen.The object of the invention is to develop a switching device of the known type so that the function of an energy regulator is integrated into it, so that the user has the option of choosing a desired temperature.

Erfindungsgemäß ist obige Aufgabe bei einer Regeleinrichtung der eingangs genannten Art dadurch gelöst, daß der Ausdehnungsfühler in Einflußbereich eines Zusatzheizkörpers liegt und daß eine Steuerschaltung für die Leistung des Zusatzheizkörpers vorgesehen ist, die mittels eines manuell betätigbaren Stellgliedes einstellbar ist, wobei die Leistung des Zusatzheizkörpers in einem Bereich so einstellbar ist, daß der Zusatzheizkörper den Ausdehnungsfühler schon auf die Abschalttemperatur bringt, wenn die Temperatur der Kochplatte niedriger als die obere Grenztemperatur ist.According to the invention, the above object is achieved in a control device of the type mentioned at the outset in that the expansion sensor is within the range of influence of an additional heating element and that a control circuit for the output of the additional heating element is provided, which can be adjusted by means of a manually actuated actuator, the output of the additional heating element in one The range can be adjusted so that the additional heating element brings the expansion sensor to the switch-off temperature when the temperature of the hotplate is lower than the upper limit temperature.

Der Strahlungsheizkörper erhitzt die Kochplatte und den Ausdehnungsfühler. Wird der Zusatzheizkörper nicht eingeschaltet, dann schaltet der Ausdehnungsfühler über den mechanischen Schaltkontakt den Strahlungsheizkörper in üblicher Weise bei Erreichen der Grenztemperatur ab. Wird der Zusatzheizkörper eingeschaltet, dann erwärmt er den Ausdehnungsfühler zusätzlich, ohne die Kochplatte wesentlich zu erwärmen. Die Abschalttemperatur des Ausdehnungsfühlers wird also schon erreicht, wenn die Kochplatte eine niedrigere Temperatur hat. Der Abschaltpunkt wird also zu niedrigeren Kochplatten-Temperaturen verschoben.The radiant heater heats the hotplate and the expansion sensor. If the additional heating element is not switched on, the expansion sensor switches off the radiant heating element in the usual way via the mechanical switch contact when the limit temperature is reached. If the additional heating element is switched on, it also heats the expansion sensor without significantly heating the hotplate. The switch-off temperature of the expansion sensor is therefore already reached when the hotplate is at a lower temperature. The switch-off point is therefore shifted to lower hotplate temperatures.

Der Benutzer hat die Möglichkeit, mittels des Stellgliedes die jeweilige Leistung, mit der der Zusatzheizkörper arbeitet, einzustellen. Er kann also im Endergebnis eine gewünschte Kochplattentemperatur wählen.The user has the option of setting the respective power with which the additional heating element works by means of the actuator. So he can choose a desired hotplate temperature in the end result.

Die Steuerschaltung zur Einstellung der Leistung des Zusatzheizkörpers kann ein Stufenschalter, eine Phasenanschnittsteuerung oder eine Impulspaketsteuerung sein.The control circuit for setting the output of the additional heating element can be a step switch, a phase control or a pulse packet control.

Die Leistung des Zusatzheizkörpers ist wesentlich kleiner als die Leistung des Strahlungsheizkörpers. Vorzugsweise ist die Leistung des Zusatzheizkörpers so klein und/oder seine Zuordnung zum Ausdehnungsfühler so, daß er, selbst wenn er mit voller Leistung arbeitet, nicht verhindert, daß der Ausdehnungsfühler bei abgeschaltetem Strahlungsheizkörper auf die Einschalttemperatur kommt. Es ist dadurch gewährleistet, daß der Strahlungsheizkörper auch dann in der gewünschten Weise "taktet", wenn eine niedrige Kochtemperatur gewählt ist. Auch die niedrige Kochtemperatur wird somit eine beliebig lange Zeit aufrechterhalten.The output of the additional radiator is significantly less than the output of the radiant heater. The output of the additional heating element is preferably so small and / or its assignment to the expansion sensor that it does not prevent the expansion sensor from reaching the switch-on temperature when the radiation heating element is switched off, even when it is working at full output. This ensures that the radiant heater "clocks" in the desired manner even when a low cooking temperature is selected. The low cooking temperature is thus maintained for an arbitrarily long time.

Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen und der folgenden Beschreibung eines Ausführungsbeispiels. In der Zeichnung Zeigen:

  • Figur 1 eine Regeleinrichtung bei einer Kochplatten-Strahlungsbeheizung in Aufsicht,
  • Figur 2 einen Querschnitt zu Fig. 1,
  • Figur 3 eine Alternative zu Fig. 2 und
  • Figur 4 eine weitere Alternative zu Fig. 2.
Further advantageous refinements of the invention result from the subclaims and the following Description of an embodiment. Show in drawing:
  • FIG. 1 shows a control device in the case of hotplate radiant heating in supervision,
  • FIG. 2 shows a cross section to FIG. 1,
  • Figure 3 shows an alternative to Fig. 2 and
  • 4 shows a further alternative to FIG. 2.

Unter einer Glaskeramikplatte(1) ist eine elektrische Heizwendel(2) angeordnet, die spiralförmig verlegt ist. Zwischen der Glaskeramikplatte(1) und der Heizwendel(2) erstreckt sich ein stabförmiger Ausdehnungsfühler(3). Dieser weist ein Quarzrohr(4) auf, in dem ein Ausdehnungsstab(5) angeordnet ist. Bei Temperaturerhöhung dehnt sich der Ausdehnungsstab(5) gegenüber dem Quarzrohr(4) und betätigt beim Erreichen einer Abschalttemperatur einen mechanischen Schaltkontakt(6), der in einem Gehäuse(7) außerhalb der Glaskeramikplatte(1) montiert ist. Mittels des Schaltkontakts(6) ist die Heizwendel(2), die an das elektrische Netz(8) angeschlossen ist, schaltbar.An electric heating coil (2) is arranged under a glass ceramic plate (1) and is laid in a spiral. A rod-shaped expansion sensor (3) extends between the glass ceramic plate (1) and the heating coil (2). This has a quartz tube (4) in which an expansion rod (5) is arranged. When the temperature rises, the expansion rod (5) expands in relation to the quartz tube (4) and, when a switch-off temperature is reached, actuates a mechanical switch contact (6) which is mounted in a housing (7) outside the glass ceramic plate (1). The heating coil (2), which is connected to the electrical network (8), can be switched by means of the switching contact (6).

Auf das Quarzrohr(4) ist ein elektrischer Zusatzheizkörper(9) gewickelt (vgl. Fig.1,2). Der Zusatzheizkörper(9) könnte auch getrennt vom Ausdehnungsfühler(3) angeordnet werden (vgl. Fig.3,4). Jedenfalls liegt der Ausdehnungsfühler(3) im thermischen Wirkungsbereich des Zusatzheizkörpers(9). Es ist auch möglich, den Zusatzheizkörper(9) in dem Quarzrohr(4) zu verlegen.An additional electric heater (9) is wound on the quartz tube (4) (see Fig. 1,2). The additional heater (9) could also be arranged separately from the expansion sensor (3) (see Fig. 3,4). In any case, the expansion sensor (3) lies in the thermal effective range of the additional heating element (9). It is also possible to lay the additional heating element (9) in the quartz tube (4).

Der Zusatzheizkörper(9) ist über eine Steuerschaltung(10) an das elektrische Netz(8) angeschlossen. Mit der Steuerschaltung(10) ist ein vom Benutzer betätigbares Stellglied(11) gekoppelt. Die Steuerschaltung(10) ist so aufgebaut, daß mit ihr die Leistung des Zusatzheizkörpers (9) entsprechend der Einstellung des Stellgliedes(11) gestellt wird. Die Steuerschaltung(10) ist beispielsweise ein Stufenschalter, mit dem die volle Netzspannung oder ein Teil der Netzspannung an den Zusatzheizkörper(9) anlegbar ist. Die Steuerschaltung(10) kann auch eine Phasenanschnittsteuerung oder eine Impulspaketsteuerung sein.The additional heater (9) is connected to the electrical network (8) via a control circuit (10). With the Control circuit (10) is coupled to an actuator (11) which can be actuated by the user. The control circuit (10) is constructed in such a way that the power of the additional heating element (9) is set in accordance with the setting of the actuator (11). The control circuit (10) is, for example, a step switch with which the full mains voltage or part of the mains voltage can be applied to the additional heating element (9). The control circuit (10) can also be a phase control or a pulse packet control.

Die Nennleistung des Zusatzheizkörpers(9) ist wesentlich kleiner als die der Heizwendel(2); sie beträgt beispielsweise einige Watt. Der Zusatzheizkörper(9) selbst trägt somit unerheblich zur Erwärmung der Glaskeramikplatte(1) bei. Allerdings ist die von ihm abgestrahlte Leistung auch nicht verloren und macht keine Kühl- bzw. Isolationsmaßnahmen notwendig, da er im gleichen Raum wie die Heizwendel(2) liegt.The nominal output of the additional heating element (9) is considerably smaller than that of the heating coil (2); for example, it is a few watts. The additional heating element (9) itself thus makes an insignificant contribution to the heating of the glass ceramic plate (1). However, the power emitted by it is not lost and does not require any cooling or insulation measures, since it is in the same room as the heating coil (2).

Die Nennleistung des Zusatzheizkörpers(9) ist so klein bemessen bzw. seine thermische Ankopplung an den Ausdehnungsfühler(3) ist so gestaltet, daß nach dem Abschalten der Heizwendel(2) sich der Ausdehnungsfühler(3) so weit abkühlt, daß der Schaltkontakt(6) wieder schließen kann, d.h. die Heizwndel(2) wieder einschaltet, selbst dann, wenn der Zusatzheizkörper(9) mit voller Leistung betrieben wird.The nominal power of the additional heater (9) is so small or its thermal coupling to the expansion sensor (3) is designed so that after the heating coil (2) is switched off, the expansion sensor (3) cools down to such an extent that the switch contact (6 ) can close again, ie the heating coil (2) switches on again, even if the additional heating element (9) is operated at full power.

Andererseits ist die Nennleistung des Zusatzheizkörpers (9) so groß bzw. seine thermische Ankopplung an den Ausdehnungsfühler(3) so gestaltet, daß der Ausdehnungsfühler(3) bei eingeschalteter Heizwendel(2) von dem mit voller Leistung arbeitenden Zusatzheizkörper(9) auf die Abschalttemperatur gebracht wird, wenn die Glaskeramikplatte(1) die kleinste wählbare Kochtemperatur erreicht hat.On the other hand, the nominal output of the additional heater (9) is so large or its thermal coupling to the expansion sensor (3) is designed so that the expansion sensor (3) with the heating coil (2) switched on from the additional heater (9) working at full power to the switch-off temperature is brought when the glass ceramic plate (1) has reached the lowest selectable cooking temperature.

Der Ausdehnungsfühler(3) und der Schaltkontakt(6) sind so ausgelegt, daß die Heizwendel(2) abgeschaltet wird, wenn - bei abgeschaltetem Zusatzheizkörper(9) - an der Glaskeramikplatte(1) die obere Grenztemperatur erreicht ist, bei der die Glaskeramikplatte(1) Schaden nehmen kann.The expansion sensor (3) and the switch contact (6) are designed so that the heating coil (2) is switched off when - with the additional heating element (9) switched off - the glass ceramic plate (1) has reached the upper limit temperature at which the glass ceramic plate ( 1) Can be damaged.

Die Funktionsweise ist im wesentlichen folgende:The principle of operation is as follows:

Wenn das Stellglied(11) auf Maximaltemperatur eingestellt ist, bleibt der Zusatzheizkörper(9) abgeschaltet. Allein die Heizwendel(2) beheizt den Ausdehnungsfühler(3). Wenn die obere Grenztemperatur erreicht ist, schaltet der Ausdehnungsstab(5) den Schaltkontakt(6), der üblicherweise ein Schnappschalter ist, um, so daß die Heizwendel(2) abgeschaltet wird. Nach Abkühlung schließt der Schaltkontakt(6) wieder.If the actuator (11) is set to maximum temperature, the additional heating element (9) remains switched off. The heating coil (2) alone heats the expansion sensor (3). When the upper limit temperature is reached, the expansion rod (5) switches the switch contact (6), which is usually a snap switch, so that the heating coil (2) is switched off. After cooling, the switch contact (6) closes again.

Wenn das Stellglied(11) auf eine Solltemperatur eingestellt wird, die niedriger als die obere Grenztemperatur ist, arbeitet der Zusatzheizkörper(9) mit einer entsprechenden Teilleistung und erwärmt den Ausdehnungsfühler(3), der auch von der eingeschalteten Heizwendel(2) erwärmt wird. Die Abschalttemperatur des Ausdehnungsfühlers(3) wird nun zu einem entsprechend früheren Zeitpunkt erreicht. Die Glaskeramikplatte(1) hat die eingestellte Solltemperatur. Die Heizwendel(2) ist abgeschaltet. Der Zusatzheizkörper(9) ist weiter eingeschaltet. Anschließend kühlt der Ausdehnungsfühler(3) ab, da er vom Zusatzheizkörper(9) allein nicht auf der Abschalttemperatur gehalten werden kann. Der Schaltkontakt(6) schließt dann wieder und die Glaskeramikplatte (1) wird "taktend" bei der eingestellten Solltemperatur gehalten.If the actuator (11) is set to a target temperature that is lower than the upper limit temperature, the additional heater (9) works with a corresponding partial output and heats the expansion sensor (3), which is also heated by the heating coil (2) that is switched on. The switch-off temperature of the expansion sensor (3) is now reached at a corresponding earlier point in time. The glass ceramic plate (1) has the set target temperature. The heating coil (2) is switched off. The additional heater (9) is still switched on. The expansion sensor (3) then cools down because the additional heating element (9) alone cannot keep it at the switch-off temperature. The switch contact (6) then closes again and the glass ceramic plate (1) is kept "clocked" at the set target temperature.

Ist das Stellglied(11) auf minimale Solltemperatur eingestellt, dann arbeitet der Zusatzheizkörper(9) ständig mit voller Leistung. Nach Erreichen der Solltemperatur und Abschalten der Heizwendel(2) verringert sich die Temperatur des Ausdehnungsfühlers(3) trotz des mit voller Leistung arbeitenden Zusatzheizkörpers(9) so weit, daß der Schaltkontakt(6) wieder schließt und damit die Heizwendel(2) wieder einschaltet.If the actuator (11) is set to the minimum target temperature, the additional heating element (9) works continuously at full output. After reaching the Setpoint temperature and switching off the heating coil (2) reduces the temperature of the expansion sensor (3) despite the additional heater (9) working at full power to such an extent that the switch contact (6) closes again and thus switches the heating coil (2) back on.

Fallen der Zusatzheizkörper(9) oder die Steuerschaltung (10) aufgrund irgendeines Defektes aus, dann arbeitet der Ausdehnungsfühler(3) in Verbindung mit dem Schaltkontakt (6) weiterhin als Sicherheitstemperaturbegrenzer.If the additional heating element (9) or the control circuit (10) fails due to some defect, then the expansion sensor (3) works in conjunction with the switch contact (6) as a safety temperature limiter.

In Fig. 3 ist der Zusatzheizkörper(9) wie die Heizwendel (2) auf einem Isolierstoffträger angeordnet. Der gewendelte Zusatzheizkörper(9) liegt also - bezogen auf die Glaskeramikplatte(1) - unterhalb des Ausdehnungsfühlers(3).In Fig. 3, the additional heater (9) is arranged like the heating coil (2) on an insulating support. The coiled additional heating element (9) is - based on the glass ceramic plate (1) - below the expansion sensor (3).

Nach Fig. 4 ist wie in Fig. 1 ein Zusatzheizkörper(9) auf das Quarzrohr(4) des Ausdehnungsfühlers(3) gewickelt. Ein weiterer Zusatzheizkörper(9) ist - ähnlich wie in Fig.3 - unterhalb des Ausdehnungsfühlers(3) angeordnet. Die beiden Zusatzheizkörper(9) sind einzeln oder gemeinsam schaltbar, wobei sie elektrisch parallel oder in Reihe geschaltet sein können. Durch diese Anordnung ist der Einfluß der Zusatzheizkörper(9) auf den Ausdehnungsfühler (3) in weiten Grenzen variierbar.According to FIG. 4, as in FIG. 1, an additional heating element (9) is wound on the quartz tube (4) of the expansion sensor (3). Another additional radiator (9) - similar to that in Figure 3 - is arranged below the expansion sensor (3). The two additional radiators (9) can be switched individually or together, and they can be electrically connected in parallel or in series. With this arrangement, the influence of the additional radiators (9) on the expansion sensor (3) can be varied within wide limits.

Es ist möglich, die Steuerschaltung(10) mit dem Stellglied(11) und das den Ausdehnungsfühler(3) tragende Gehäuse(7) zu einer Baueinheit zu integrieren. Es ist damit eine baulich kompakte Regeleinrichtung geschaffen, die sowohl die Funktion eines Sicherheitstemperaturbegrenzers als auch die Funktion eines Energiereglers hat.It is possible to integrate the control circuit (10) with the actuator (11) and the housing (7) carrying the expansion sensor (3) into one structural unit. A structurally compact control device is thus created, which has both the function of a safety temperature limiter and the function of an energy regulator.

Claims (13)

Regeleinrichtung für eine Kochplatten-Strahlungsbeheizung, wobei unter der Kochplatte ein elektrischer Strahlungsheizkörper angeordnet ist, in dessen Wirkungsbereich ein stabförmiger Ausdehnungsfühler vorgesehen ist, der bei einer oberen Grenztemperatur einen mechanischen Schaltkontakt betätigt und dadurch den Heizkörper abschaltet (Abschalttemperatur),
dadurch gekennzeichnet,
daß der Ausdehnungsfühler(3) im Einflußbereich eines Zusatzheizkörpers(9) liegt und daß eine Steuerschaltung (10) für die Leistung des Zusatzheizkörpers(9) vorgesehen ist, die mittels eines manuell betätigbaren Stellgliedes (11) einstellbar ist, wobei die Leistung des Zusatzheizkörpers(9) in einen Bereich so einstellbar ist, daß der Zusatzheizkörper(9) den Ausdehnungsfühler(3) schon auf die Abschalttemperatur bringt, wenn die Temperatur der Kochplatte(1) niedriger als die obere Grenztemperatur ist.Control device for a hotplate radiant heater, an electric radiant heater being arranged under the hotplate, in the effective area of which a rod-shaped expansion sensor is provided, which actuates a mechanical switch contact at an upper limit temperature and thereby switches off the heater (switch-off temperature),
characterized,
that the expansion sensor (3) lies in the area of influence of an additional heating element (9) and that a control circuit (10) for the output of the additional heating element (9) is provided, which can be adjusted by means of a manually actuated actuator (11), the output of the additional heating element ( 9) can be set in a range such that the additional heating element (9) brings the expansion sensor (3) to the switch-off temperature when the temperature of the hotplate (1) is lower than the upper limit temperature. Regeleinrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß die Steuerschaltung(10) ein Stufenschalter ist.Control device according to claim 1,
characterized,
that the control circuit (10) is a tap changer. Regeleinrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß die Steuerschaltung(10) eine Phasenanschnittsteuerung ist.Control device according to claim 1,
characterized,
that the control circuit (10) is a phase control. Regeleinrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß die Steuerschaltung(10) eine Impulspaketsteuerung ist.Control device according to claim 1,
characterized,
that the control circuit (10) is a pulse packet control. Regeleinrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß die Nennleistung des Zusatzheizkörpers(9) wesentlich kleiner als die Leistung des Strahlungsheizkörpers(2) ist.Control device according to one of the preceding claims,
characterized,
that the nominal power of the additional heater (9) is significantly less than the power of the radiant heater (2). Regeleinrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß die Leistung des Zusatzheizkörpers(9) so klein und/oder seine Zuordnung zum Ausdehnungsfühler(3) so ist, daß er, selbst wenn er mit voller Leistung arbeitet, nicht verhindert, daß der Ausdehnungsfühler(3) bei abgeschaltetem Strahlungsheizkörper(2) auf die Einschalttemperatur kommt.Control device according to one of the preceding claims,
characterized,
that the power of the additional heater (9) is so small and / or its assignment to the expansion sensor (3) is such that it does not prevent the expansion sensor (3) when the radiant heater (2) is switched off, even if it works at full power the switch-on temperature comes. Regeleinrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß die Leistung des Zusatzheizkörpers(9) so groß und/oder seine Zuordnung zum Ausdehnungsfühler(3) so ist, daß er mit voller Leistung arbeitend den Ausdehnungsfühler(3) auf die Abschalttemperatur bringt, wenn die Kochplatte(1) die kleinste an dem Stellglied(11) wählbare Kochtemperatur erreicht hat.Control device according to one of the preceding claims,
characterized,
that the output of the additional heating element (9) is so large and / or its assignment to the expansion sensor (3) is such that it operates the expansion sensor (3) at full power to the switch-off temperature when the hotplate (1) is the smallest on the actuator (11) selectable cooking temperature has been reached. Regeleinrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß die Abschalttemperatur so gewählt ist, daß sie bei abgeschaltetem Zusatzheizkörper(9) erreicht ist, wenn an der Kochplatte(1) die oberste Grenztemperatur erreicht ist.Control device according to one of the preceding claims,
characterized,
that the switch-off temperature is selected such that it is reached when the additional heating element (9) is switched off when the highest limit temperature has been reached on the hotplate (1). Regeleinrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß der Zusatzheizkörper(9) getrennt von dem Ausdehnungsfühler(3) angeordnet ist.Control device according to one of the preceding claims,
characterized,
that the additional heater (9) is arranged separately from the expansion sensor (3). Regeleinrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß der Zusatzheizkörper(9) eine Widerstandsdrahtwicklung ist, die auf ein Quarzrohr(4) des Ausdehnungsfühlers(3) gewickelt ist.Control device according to one of the preceding claims,
characterized,
that the additional heater (9) is a resistance wire winding, which is wound on a quartz tube (4) of the expansion sensor (3). Regeleinrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß der Zusatzheizkörper(9) im Quarzrohr(4) des Ausdehnungsfühlers(3) zwischen dem Quarzrohr(4) und einem Ausdehnungsstab(5) angeordnet ist.Control device according to one of the preceding claims,
characterized,
that the additional heater (9) is arranged in the quartz tube (4) of the expansion sensor (3) between the quartz tube (4) and an expansion rod (5). Regeleinrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß zwei oder mehrere Zusatzheizkörper(9) vorgesehen sind.Control device according to one of the preceding claims,
characterized,
that two or more additional radiators (9) are provided. Regeleinrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß der Ausdehnungsfühler(3), der Schaltkontakt(6), die Steuerschaltung(10) und das Stellglied(11) eine integrierte Baueinheit bilden.Control device according to one of the preceding claims,
characterized,
that the expansion sensor (3), the switch contact (6), the control circuit (10) and the actuator (11) form an integrated unit.
EP96107317A 1995-06-22 1996-05-09 Control arrangement for a radiation heating device for a cooking plate Withdrawn EP0750330A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1995122748 DE19522748A1 (en) 1995-06-22 1995-06-22 Control device for hotplate radiant heating
DE19522748 1995-06-22

Publications (2)

Publication Number Publication Date
EP0750330A2 true EP0750330A2 (en) 1996-12-27
EP0750330A3 EP0750330A3 (en) 1998-01-21

Family

ID=7765032

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96107317A Withdrawn EP0750330A3 (en) 1995-06-22 1996-05-09 Control arrangement for a radiation heating device for a cooking plate

Country Status (2)

Country Link
EP (1) EP0750330A3 (en)
DE (1) DE19522748A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2781051A1 (en) * 1998-07-09 2000-01-14 Electrovac TEMPERATURE SENSOR FOR COOKING PLATE OF A COOKING FIREPLACE
DE102004058473A1 (en) * 2004-11-24 2006-06-08 E.G.O. Elektro-Gerätebau GmbH Heating device e.g. radiation heating device for ceramic hob has single heating area, which is designed for individual operation and additional heating area, which is operable additionally in combination with single heating area
CN102256388A (en) * 2011-06-09 2011-11-23 广东格兰仕集团有限公司 Welding structure of heating tool
CN102573140A (en) * 2012-01-18 2012-07-11 杭州热威机电有限公司 Fixing structure for lug plate

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GB2134713A (en) * 1983-01-31 1984-08-15 Diamond H Controls Ltd Energy regulating switch
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DE1132670B (en) * 1960-02-03 1962-07-05 Siemens Elektrogeraete Gmbh Switching device with PTC thermistor
DE3100758A1 (en) * 1981-01-13 1982-09-02 Ako Werke Gmbh & Co Switching device
GB2134713A (en) * 1983-01-31 1984-08-15 Diamond H Controls Ltd Energy regulating switch
EP0379782A2 (en) * 1989-01-26 1990-08-01 Kabushiki Kaisha Toshiba Electric cooking appliance

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2781051A1 (en) * 1998-07-09 2000-01-14 Electrovac TEMPERATURE SENSOR FOR COOKING PLATE OF A COOKING FIREPLACE
DE102004058473A1 (en) * 2004-11-24 2006-06-08 E.G.O. Elektro-Gerätebau GmbH Heating device e.g. radiation heating device for ceramic hob has single heating area, which is designed for individual operation and additional heating area, which is operable additionally in combination with single heating area
DE102004058473B4 (en) * 2004-11-24 2007-09-13 E.G.O. Elektro-Gerätebau GmbH Heating device, in particular radiant heater
CN102256388A (en) * 2011-06-09 2011-11-23 广东格兰仕集团有限公司 Welding structure of heating tool
CN102573140A (en) * 2012-01-18 2012-07-11 杭州热威机电有限公司 Fixing structure for lug plate

Also Published As

Publication number Publication date
EP0750330A3 (en) 1998-01-21
DE19522748A1 (en) 1997-01-02

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