EP1258171B1 - Cooking surface comprising a temperature sensor - Google Patents

Cooking surface comprising a temperature sensor Download PDF

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Publication number
EP1258171B1
EP1258171B1 EP01905751A EP01905751A EP1258171B1 EP 1258171 B1 EP1258171 B1 EP 1258171B1 EP 01905751 A EP01905751 A EP 01905751A EP 01905751 A EP01905751 A EP 01905751A EP 1258171 B1 EP1258171 B1 EP 1258171B1
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EP
European Patent Office
Prior art keywords
hob
heating element
underside
plate
heating
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
EP01905751A
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German (de)
French (fr)
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EP1258171A1 (en
Inventor
Dan Neumayer
Uwe Has
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.)
BSH Hausgeraete GmbH
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BSH Bosch und Siemens Hausgeraete GmbH
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Publication of EP1258171A1 publication Critical patent/EP1258171A1/en
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Publication of EP1258171B1 publication Critical patent/EP1258171B1/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/746—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
    • H05B2213/07—Heating plates with temperature control means

Definitions

  • the present invention relates to a hob according to the preamble of claim 1, and a corresponding heating element and a suitable element.
  • Such a hob is known from the document DE 37 03 768 C2, wherein a device for detecting the temperature of a heated by means of heating coils or halogen lamps glass ceramic plate is disclosed with a temperature sensor. This emits a signal corresponding to the temperature of the glass ceramic for a control circuit.
  • the heating coils or the halogen lamps are arranged in the interior of a pot-like insulating support and heat the glass ceramic plate via direct radiation.
  • the edge of the insulating substrate is spring-loaded on the underside of the glass-ceramic plate, and the temperature sensor is disposed outside the interior of the insulating substrate but inside the heating element.
  • the temperature sensor is further in thermally conductive connection with the underside of the glass ceramic plate, wherein the temperature sensor is arranged in a receptacle in the edge of the insulating support.
  • the receptacle is arranged at a distance x to the inside of the edge of the insulating support, the minimum value of which is selected so that the short-term temperature changes occurring when the heating coils or the halogen lamps are switched on and off have only a negligible influence on the temperature sensor.
  • the maximum value of the distance x is chosen such that the delay in the control characteristic caused by the thermal conductivity of the glass ceramic plate results in a small hysteresis. As a distance x widths of 3 mm to 6 mm have proven to be advantageous.
  • the temperature sensor is introduced into the introduced or indented receptacle on the upper side of the projection, which protrudes into the interior of the insulating support, and is in heat-conducting connection with the underside of the glass ceramic plate.
  • the temperature sensor is indirectly held under spring tension on the underside of the glass ceramic plate in order to keep the heat transfer resistance between the glass ceramic plate and the temperature sensor small.
  • a heating element for a cooking unit with a temperature sensor is known.
  • a heat transfer element in the form of a sheet is used, which is arranged partially overlapping the heated area between the radiators and the glass ceramic plate, but protrudes from the heating element and there with the Temperature sensor of the controller is in communication.
  • the heat transfer element is fixed on the edge of the heating shell bearing by clamping and is usually on the underside of the glass ceramic plate. From the heat-sensing region of the heat transfer element, an outer section protrudes outwards beyond the edge of the heating element.
  • the sensor socket of the temperature sensor is pressed by a compression spring to the underside of the heat transfer surface of the heat transfer element, which is supported on a leading the sensor socket, mounted on the outer portion of the heat transfer element holding mechanism.
  • a compression spring to the underside of the heat transfer surface of the heat transfer element, which is supported on a leading the sensor socket, mounted on the outer portion of the heat transfer element holding mechanism.
  • an electrical NTC or PTC sensor can be used, which is pressed resiliently or is fixedly attached to the outer portion of the heat transfer element.
  • the heat transfer element can be grounded, providing contact protection.
  • US Pat. No. 4,447,710 discloses a glass-ceramic cooking field in which an insulating body is arranged in the edge area of the heating element, on which a temperature sensor, for example a thermocouple, is seated.
  • the thermocouple is held in good thermal contact with the underside of the glass ceramic plate by means of the insulation block.
  • Object of the present invention is to provide a generic hob and a corresponding heating element, which have a good accuracy.
  • this is achieved in that in a hob according to the preamble of claim 1, the temperature sensor by means of a heat-conducting Element is thermally in contact with the underside of the hob plate, and that the element and the temperature sensor are shielded by insulating material against the heat radiation of the heating medium.
  • a temperature is determined quickly and accurately enough by the measuring arrangement, which corresponds approximately to a frying pan placed above the heating element on the hob plate. It is also ensured that the heat transfer from the frying pan or the hob plate to the temperature sensor is not limited to the areally very small temperature sensor.
  • the surface area A of the element, which is in thermal contact with the underside of the hob plate is at least 5 times, in particular approximately 10 times, larger than the base area B of the temperature sensor.
  • a lateral distance a of the element to the edge region of the insulating material is about 6 to 12 mm, in particular about 8 mm.
  • the temperature sensor is attached to the element, in particular poured into the element attached to this.
  • the heat conduction element in the region of the outer peripheral wall of the heating element or the insulating support attached directly or with the aid of an intermediate mounting part, in particular screwed.
  • the intermediate mounting part is fixed in the bottom region of the heating element and extends in the region of the outer peripheral wall of the heating element, in which the element is in turn screwed to the intermediate mounting part.
  • the temperature sensor is attached to the underside of the element.
  • a large plane contact surface for improving the heat conduction from the underside of the glass ceramic plate to the temperature sensor can be realized.
  • the temperature sensor is characterized by the larger area element in the assembly process, e.g. when falling the unit element / temperature sensor, better mechanically protected.
  • the element may have a receiving portion for the temperature sensor and a mounting portion for the attachment of the element, in particular in the heating element, wherein the receiving portion is radially laterally offset from the mounting portion.
  • the temperature sensor is to be mounted in the immediate vicinity of a temperature limiter present in the heating element.
  • the temperature limiter namely the mounting space in the region of the outer peripheral wall of the heating element is limited, on the other hand, it is favorable if the various electrical connections of the temperature limiter and the temperature sensor are as close as safety-friendly together.
  • the element is formed at least in two parts.
  • a receiving part for the temperature sensor consists of a softer material in order to be able to geometrically reshape the receiving part in an application-specific and safety-related manner.
  • the remainder of the element may consist of a different material, wherein in particular a spring material is suitable for being able to press the element in a defined manner against the underside of the glass-ceramic plate.
  • the element is designed as a torsion spring, wherein the torsion region of the spring element is provided substantially outside the heating element and thus in a cooler area.
  • the element is designed to be electrically conductive and grounded in order to optimally meet the safety regulations with a simple structure.
  • the electrical leads of the temperature sensor are connected to a first connection portion of the element or a fitting mounted there.
  • the element can also have a second connection section, to which a grounding line of the element is connected.
  • a hob 1 has a hob plate 3, in particular made of glass ceramic, on (Fig. 1). Below the hob plate 3 are different in a conventional manner Heating elements 5 of the hob provided, which are pressed in a known manner to the underside of the hob plate 3 (not shown). In the region of the heating element 5, the hob plate 3 is usually decorated accordingly on its upper side. In this heated area a cooking vessel 6 is shut off. The bottom of the cooking vessel 6 is in the cold state often only in the edge region of the heating element 5 in an annular surface on the hob plate 3, while in the central residual region of the pot bottom is spaced by an air gap from the plate (Fig. 1). In the heated state, this air gap is reduced or ideally to approximately zero by the known thermally induced movement of the pot bottom.
  • the heating element 5 has a cup-shaped sheet metal pot 7, in which a circular disk-shaped insulation plate 9 is located. Furthermore, an inner insulation ring 11 and an outer insulation ring 13 corresponding to a two-circuit heating arrangement are provided within the sheet metal pot 7 on the insulation plate 9. As a result, the interior of the heating element 5 is separated into an inner and an outer heating region, in each of which a Bandterrorismleiter 15 extends (Fig. 1, Fig. 2). In known manner, a Schuleiteran gleichteil 17 is fixed in the region of the outer peripheral wall of the sheet metal pot 7, which is on the one hand conductively connected to the Bandterrorismn 15 and on the other hand to not shown electrical supply lines of the hob 1 can be connected (Fig. 2).
  • the heating element 5 also has a known temperature limiter 19, whose rod extends transversely across the heated region of the heating element.
  • the terminal block of the temperature limiter 19 has the known and usual, laterally issued Kunststoffflachsteckite for connection to the power supply line or to the Schuleiteranschlußteil 17 of the heating element 5.
  • an insulation block 21 is disposed in the region of the temperature limiter 19. This can serve to thermally shield the temperature limiter 19 in the region of sections of the band heating conductor 15 guided below the insulation block 21.
  • a receiving recess 23 is milled in its upper side.
  • a heat-conducting element 25 is arranged with its element hood 27 (FIGS. 1, 2, 3).
  • hood 27 is not seated directly on the bottom of the recess 23 so that the hood 27 can yield slightly to a blow on the hob plate 3. As a result, damage or breakage of the plate 3 can be avoided, especially if it is made of glass or glass ceramic material.
  • the element hood 27 In the receiving space formed by the element hood 27 is by means of a temperature-resistant and thermally conductive ceramic adhesive 28 as a temperature sensor 29, a PT-500 probe embedded with its sensor leads 30 and thereby secured and guided.
  • the material of the element cover 27 is X7 steel and the hood 27 is designed as a bent part.
  • the hood material must have sufficiently good heat conduction properties, must be well deformable, as explained below, but sufficiently mechanically stable over the entire temperature range of up to 350 - 400 ° C, and retain its properties even at these temperatures.
  • two side walls 31 are bent substantially at right angles down (Fig. 3). Also bent at right angles to the side walls 31 define bottom walls 33 a slot-shaped open bottom of the element cover 27.
  • the front side of the receiving space of the hood is closed by a right angle bent from the top wall end wall 35.
  • the hood-like design of the element 25 ensures that the safety-prescribed air and creepage distance to the live temperature sensor 29 is maintained in the event of breakage of the hob plate 3, without the base of the element 25 and the hood 27 and thus of the insulation block 21 too large to have to shape. More detailed explanations on the geometric design and arrangement of the temperature sensor 29, the element 25 and the insulation block 21 are made in connection with the description of the sketched in Fig. 5 third embodiment.
  • the hood 27 is fixedly connected to a substantially L-shaped hood carrier 37 made of steel, preferably welded.
  • the element hood 27 is seated on a connecting section 39 of the hood carrier 37 (FIG. 3).
  • the top wall of the element hood 27 is slightly elevated relative to the top of the hood support 37 and defines and limits a surface area A in which the element 25 rests on the underside of the hob plate 3 in a heat-conducting manner (FIGS. 1, 2, 5). Due to the overlapping connection of hood 27 and hood carrier 37, the stability of the connection is also increased.
  • the cage carrier 37 is made of 0.8 mm thick material in order to be suitable for the earthing plug-in connections described below, the element cover 27 is made of thinner material, which additionally simplifies their forming.
  • the hood carrier 37 merges in a spring section 41 into a mounting section 43 (FIGS. 2, 3).
  • the spring portion 41 is arranged substantially outside the heated region of the heating element 5 and the outer insulation ring 13.
  • the mounting portion 43 of the hood support 37 has a rectangularly downward bent mounting plate 45 with mounting holes 47.
  • the heat-conducting element 25 height adjustable via an intermediate mounting member 48 on the outer peripheral wall of the sheet metal pot 7 are fixed (Fig. 2).
  • the intermediate mounting part 48 is bolted on the one hand to the underside of the sheet metal pot 7 in the bottom thereof (not shown). This part 48 extends approximately L-shaped from the bottom of the heating element to its side wall 7.
  • the heat-conducting element 25 is then screwed to the intermediate mounting part 48 and thus defined in terms of height the position of the heat-conducting element 25 defined.
  • the heat-conducting element 25 can also be screwed to the outer wall of the sheet-metal pot 7 in the region of the assembly openings 47.
  • a connection part can be attached (not shown), with the one hand, the electrical sensor leads 30 of the temperature sensor 29 connectable, eg attachable, and are connected to the other hand electrical connection lines of a control unit 101 (Fig.
  • connection part is further to ensure that the electrical connections of the PT temperature sensor 29 to ground or the grounded hood carrier 37 are isolated.
  • the temperature sensor and the sensor lines 30 are covered over the entire length of the heat-conducting element 25 deck.
  • the mounting plate 45 has a flat pin 49 to which a grounding line 51 and their standardized AMP plug of the hob is directly pluggable. As a result, the heat-conducting element 25 is set to ground potential.
  • the ohmic resistance of the element 25 is at a value of 0.1 ohms or less in order to withstand a continuous current load of at least 25 A.
  • the allowed Heat-conducting element 25 should also not be designed to be stiff in order to be able to yield properly under mechanical load or movement of the hob plate 3. Otherwise would be feared by a too stiff concern of the element 25 and the element cover 27 on the hob plate 3 hotplate chipping on the underside of the plate 3 or possibly also their breakage.
  • Fig. 4 is shown in sections in a cross-sectional view transversely to the longitudinal extent of the element and thus approximately perpendicular to the line II in Fig. 2 of the hob shown in which the temperature sensor 29 together with a heat conducting element 75 in the region of the insulation block 21 similar to the first embodiment is arranged.
  • the heat-conducting element 25 has no element hood, but rather an element shell 77. This element shell is likewise arranged in a suitable receiving depression 23 of the insulation block 21.
  • the insulation shell lies in its edge regions in an annular surface directly on the underside of the glass ceramic plate 3 and is thus in thermally conductive connection with it.
  • the temperature sensor 29 is arranged, wherein the shell is additionally filled by a thermal paste.
  • the heat conducting element 75 not shown in detail could otherwise be shaped like the heat conducting element 25 of the first embodiment. For safety reasons, however, the temperature sensor 29 is operated with a safety extra-low voltage or transmits its measuring signal without contact from the heating element.
  • the heat-conducting element 85 designed in the shape of a hood has an element hood 87 which corresponds to that of the first exemplary embodiment.
  • a mounting portion 89 of the hood carrier 37 is not laterally offset radially arranged to the receiving portion of the element hood 87. Rather, the mounting portion 89 extends in extension of the element cover 87 radially unopposed along the outer wall of the sheet metal pot 7 vertically downwards.
  • Fig. 5 is shown schematically in which area A, the heat conducting element 85 is thermally in contact with the underside of the hob plate 3.
  • the size of the surface is about 50 to 100 mm 2 .
  • the contact surface A is about 10 times larger than a base B of the temperature sensor 29. This ensures, inter alia, that the temperature at the bottom of the cooktop panel by the temperature sensor not quasi point-like, but determined integrating over a larger area becomes. This is particularly important because the respective pan diameter and its soil properties are not known exactly and can also vary from pan to pan type.
  • a lateral minimum distance a of the element 85 to the edge region of the insulating material 21 is about 8 mm.
  • the temperature sensor 29 and the element hood 27 are shielded by the insulation block 21 on the one hand sufficiently against the emanating from the Bandbyleiter 15 thermal radiation.
  • the insulation block is still small enough to avoid an adverse shading of the cooking vessel bottom 6 and thereby caused undesirable uneven heat distribution in the pan bottom when heating or frying.
  • the heat-conducting element 25 is still sufficiently thermally coupled to the region of the hob plate, which is heated directly by the heat radiation of the heating means 15. This is also achieved in the first and in the third embodiment, wherein at the same time the temperature sensor 29 relative to the hob plate 3 is covered by a grounded protective element 27 in compliance with the required according to 4 or 8 mm creepage and air gap.
  • the measuring surface A is coupled by a high-temperature lubricant to the cooktop plate underside, which consists in particular of glass ceramic material, in order to achieve improved heat transfer and impact resistance improved damping.
  • FIG. 6 schematically shows a block diagram showing the most important components of the cooktop.
  • the control unit 101 regulates the heating power of the BandMapleiters 15 according to the measured values of the temperature sensor 29 to the predetermined by an input unit 103 target value. As a result, it can be achieved, in particular, that burning is virtually impossible during roasting.

Abstract

The cooker hob zone has a hob plate, especially of glass ceramic, with at least one heating element underneath it to heat a pot on the plate and a temperature sensor (29) in the heating element connected to a unit for controlling the heating element's heating power. The sensor is in thermal contact with the plate's underside via a heat conducting element (85) and is screened against thermal radiation from the heater by insulating material (21). Independent claims are also included for the following: a heating element for a cooker zone and an element for the heating element.

Description

Die vorliegende Erfindung betrifft ein Kochfeld nach dem Oberbegriff des Patentanspruches 1, sowie ein entsprechendes Heizelement und ein geeignetes Element.The present invention relates to a hob according to the preamble of claim 1, and a corresponding heating element and a suitable element.

Ein derartiges Kochfeld ist bekannt aus der Druckschrift DE 37 03 768 C2, wobei eine Vorrichtung zum Erfassen der Temperatur einer mittels Heizwicklungen oder Halogenlampen aufgeheizten Glaskeramikplatte mit einem Temperatursensor offenbart ist. Dieser gibt ein der Temperatur der Glaskeramik entsprechendes Signal für eine Regelschaltung ab. Die Heizwicklungen oder die Halogenlampen sind im Innenraum eines topfartigen Isolierträgers angeordnet und erwärmen die Glaskeramikplatte über direkte Strahlung. Der Rand des Isolierträgers liegt an der Unterseite der Glaskeramikplatte unter Federspannung an, und der Temperatursensor ist außerhalb des Innenraums des Isolierträgers, jedoch innerhalb des Heizelementes, angeordnet. Der Temperatursensor steht weiterhin mit der Unterseite der Glaskeramikplatte in wärmeleitender Verbindung, wobei der Temperatursensor in einer Aufnahme im Rand des Isolierträgers angeordnet ist. Die Aufnahme ist in einem Abstand x zur Innenseite des Randes des Isolierträgers angeordnet, dessen minimaler Wert so gewählt ist, dass die beim Ein- und Ausschalten der Heizwicklungen oder der Halogenlampen entstehenden kurzzeitigen Temperaturänderungen nur einen vernachlässigbaren Einfluss auf den Temperatursensor haben. Der maximale Wert des Abstandes x ist so gewählt, dass die durch die Wärmeleitfähigkeit der Glaskeramikplatte bedingte Verzögerung in der Regelcharakteristik eine kleine Hysterese ergibt. Als Abstand x haben sich Weiten von 3 mm bis 6 mm als vorteilhaft erwiesen. Der Temperatursensor ist in die eingebrachte oder eingedrückte Aufnahme auf der Oberseite des Ansatzes, der in den Innenraum des Isolierträgers ragt, eingebracht und steht mit der Unterseite der Glaskeramikplatte in wärmeleitender Verbindung. Der Temperatursensor ist mittelbar unter Federspannung an der Unterseite der Glaskeramikplatte gehalten, um den Wärmeübergangswiderstand zwischen der Glaskeramikplatte und dem Temperatursensor klein zu halten.Such a hob is known from the document DE 37 03 768 C2, wherein a device for detecting the temperature of a heated by means of heating coils or halogen lamps glass ceramic plate is disclosed with a temperature sensor. This emits a signal corresponding to the temperature of the glass ceramic for a control circuit. The heating coils or the halogen lamps are arranged in the interior of a pot-like insulating support and heat the glass ceramic plate via direct radiation. The edge of the insulating substrate is spring-loaded on the underside of the glass-ceramic plate, and the temperature sensor is disposed outside the interior of the insulating substrate but inside the heating element. The temperature sensor is further in thermally conductive connection with the underside of the glass ceramic plate, wherein the temperature sensor is arranged in a receptacle in the edge of the insulating support. The receptacle is arranged at a distance x to the inside of the edge of the insulating support, the minimum value of which is selected so that the short-term temperature changes occurring when the heating coils or the halogen lamps are switched on and off have only a negligible influence on the temperature sensor. The maximum value of the distance x is chosen such that the delay in the control characteristic caused by the thermal conductivity of the glass ceramic plate results in a small hysteresis. As a distance x widths of 3 mm to 6 mm have proven to be advantageous. The temperature sensor is introduced into the introduced or indented receptacle on the upper side of the projection, which protrudes into the interior of the insulating support, and is in heat-conducting connection with the underside of the glass ceramic plate. The temperature sensor is indirectly held under spring tension on the underside of the glass ceramic plate in order to keep the heat transfer resistance between the glass ceramic plate and the temperature sensor small.

Weiterhin ist aus der Druckschrift EP 0 021 107 A1 ein Heizelement für eine Kocheinheit mit einem Temperaturfühler bekannt. Um eine vollständige Beheizung der gesamten Fläche des Heizelementes beizubehalten und trotzdem den Temperaturfühler des Reglers eng an die Beheizung zu koppeln, wird ein Wärmeübertragungselement in Form eines Bleches verwendet, das den beheizten Bereich teilweise überdeckend zwischen den Heizkörpern und der Glaskeramikplatte angeordnet ist, jedoch aus dem Heizelement herausragt und dort mit dem Temperaturfühler des Reglers in Verbindung steht. Das Wärmeübertragungselement ist auf dem Rand der die Beheizung tragenden Schale durch Festklemmen befestigt und liegt normalerweise an der Unterseite der Glaskeramikplatte an. Von dem die Wärme abfühlenden Bereich des Wärmeübertragungselementes ragt ein Aussenabschnitt nach aussen über den Rand des Heizelementes hinaus. Er ist einstückig mit dem vorgenannten Bereich ausgebildet, zu diesem im wesentlichen parallel, jedoch durch eine Abbiegung etwas nach unten versetzt, so dass der Aussenabschnitt nicht an der Unterseite der Glaskeramikplatte anliegt. Die Fühlerdose des Temperaturfühlers wird durch eine Druckfeder an die Unterseite der Wärmeübertragungsfläche des Wärmeübertragungselementes angedrückt, die sich an einem die Fühlerdose führenden, an dem Außenabschnitt des Wärmeübertragungselementes angebrachten Haltemechanismus abstützt. Es sind jedoch auch andere Fühlerarten und -anbringungen möglich. So kann beispielsweise auch ein elektrischer NTC- oder PTC-Fühler verwendet werden, der federnd angedrückt wird oder fest an dem Außenabschnitt des Wärmeübertragungselementes angebracht ist. Das Wärmeübertragungselement kann gewünschtenfalls geerdet werden, wodurch ein Berührungsschutz vorliegt.Furthermore, from the document EP 0 021 107 A1 a heating element for a cooking unit with a temperature sensor is known. To complete heating of the entire To maintain surface of the heating element and still closely couple the temperature sensor of the controller to the heating, a heat transfer element in the form of a sheet is used, which is arranged partially overlapping the heated area between the radiators and the glass ceramic plate, but protrudes from the heating element and there with the Temperature sensor of the controller is in communication. The heat transfer element is fixed on the edge of the heating shell bearing by clamping and is usually on the underside of the glass ceramic plate. From the heat-sensing region of the heat transfer element, an outer section protrudes outwards beyond the edge of the heating element. It is integrally formed with the aforementioned area, to this substantially parallel, but offset by a turn something down, so that the outer portion is not applied to the underside of the glass ceramic plate. The sensor socket of the temperature sensor is pressed by a compression spring to the underside of the heat transfer surface of the heat transfer element, which is supported on a leading the sensor socket, mounted on the outer portion of the heat transfer element holding mechanism. However, other sensor types and attachments are possible. Thus, for example, an electrical NTC or PTC sensor can be used, which is pressed resiliently or is fixedly attached to the outer portion of the heat transfer element. If desired, the heat transfer element can be grounded, providing contact protection.

Weiterhin ist aus der Druckschrift US 4,447,710 ein Glaskeramikkochfeld bekannt, bei dem im Randbereich des Heizelementes ein Isolationskörper angeordnet ist, auf dem ein Temperaturfühler, beispielsweise ein Thermoelement sitzt. Das Thermoelement ist in einem guten thermischen Kontakt mit der Unterseite der Glaskeramikplatte mittels des Isolationsblocks gehalten.Furthermore, US Pat. No. 4,447,710 discloses a glass-ceramic cooking field in which an insulating body is arranged in the edge area of the heating element, on which a temperature sensor, for example a thermocouple, is seated. The thermocouple is held in good thermal contact with the underside of the glass ceramic plate by means of the insulation block.

Aufgabe der vorliegenden Erfindung ist es, ein gattungsgemäßes Kochfeld und ein entsprechendes Heizelement bereitzustellen, die eine gute Meßgenauigkeit aufweisen.Object of the present invention is to provide a generic hob and a corresponding heating element, which have a good accuracy.

Erfindungsgemäß ist dies dadurch erreicht, dass bei einem Kochfeld nach dem Oberbegriff des Patentanspruches 1 der Temperaturfühler mittels eines wärmeleitenden Elementes mit der Unterseite der Kochfeldplatte thermisch in Kontakt ist, und daß das Element und der Temperaturfühler mittels Isolationsmaterial abgeschirmt sind gegen die Wärmestrahlung des Heizmittels. Dadurch ist sichergestellt, dass durch die Mess-Anordnung eine Temperatur schnell und genau genug bestimmt wird, die etwa der einer oberhalb des Heizelementes auf der Kochfeldplatte abgestellten Bratpfanne entspricht. Auch ist gewährleistet, dass die Wärmeübertragung von der Bratpfanne bzw. der Kochfeldplatte zum Temperaturfühler nicht auf den flächenmäßig sehr kleinen Temperaturfühler begrenzt ist.According to the invention this is achieved in that in a hob according to the preamble of claim 1, the temperature sensor by means of a heat-conducting Element is thermally in contact with the underside of the hob plate, and that the element and the temperature sensor are shielded by insulating material against the heat radiation of the heating medium. This ensures that a temperature is determined quickly and accurately enough by the measuring arrangement, which corresponds approximately to a frying pan placed above the heating element on the hob plate. It is also ensured that the heat transfer from the frying pan or the hob plate to the temperature sensor is not limited to the areally very small temperature sensor.

Gemäß einer bevorzugten Ausführungsform ist der Flächenbereich A des Elementes, der mit der Unterseite der Kochfeldplatte thermisch in Kontakt steht etwa mindestens 5 mal, insbesondere etwa 10 mal größer ist als die Grundfläche B des Temperaturfühlers.According to a preferred embodiment, the surface area A of the element, which is in thermal contact with the underside of the hob plate, is at least 5 times, in particular approximately 10 times, larger than the base area B of the temperature sensor.

Vorteilhafterweise beträgt ein seitlicher Abstand a des Elementes zum Randbereich des Isolationsmaterials etwa 6 bis 12 mm, insbesondere etwa 8 mm. Dieser Wert hat sich überraschender Weise ergeben, wenn einerseits die Abschirmung gegenüber der Wärmestrahlung des Heizmittels des Heizelementes ausreichend groß sein soll, und wenn andererseits die Ankopplung des Wärmeleitelementes an die durch die Wärmestrahlung beheizte Kochfeldplatte ausreichend gut sein soll.Advantageously, a lateral distance a of the element to the edge region of the insulating material is about 6 to 12 mm, in particular about 8 mm. This value has surprisingly been found, on the one hand, the shield against the heat radiation of the heating means of the heating element should be sufficiently large, and on the other hand, the coupling of the heat-conducting to the heated by the heat radiation hob plate should be sufficiently good.

Um über die Betriebdauer des Heizelementes messtechnisch definierte und gleichbleibende Verhältnisse bereitstellen zu können, ist der Temperaturfühler an dem Element befestigt, insbesondere in das Element gegossen an diesem befestigt.In order to provide metrologically defined and consistent conditions over the service life of the heating element, the temperature sensor is attached to the element, in particular poured into the element attached to this.

Um das Element schnell und fehlerfrei montieren zu können, ist vorgesehen, dass das Wärmeleitungselement im Bereich der Außenumfangswand des Heizelementes bzw. des Isolierträgers direkt oder unter Zuhilfenahme eines Zwischenmontageteiles befestigt, insbesondere verschraubt ist. Dabei kann insbesondere vorgesehen sein, dass das Zwischenmontageteil im Bodenbereich des Heizelementes befestigt ist und sich in den Bereich der Außenumfangswand des Heizelementes erstreckt, in dem das Element wiederum mit dem Zwischenmontageteil verschraubt ist. Um den Anpressdruck bzw. die Anpressfläche des Elementes und damit unter anderem die thermische Ankopplung des Elementes an die Unterseite der Kochfeldplatte gut einstellen zu können, kann das Element an der Außenumfangswand des Heizelementes in verschiedenen Höhen anschraubbar sein.To be able to mount the element quickly and without error, it is provided that the heat conduction element in the region of the outer peripheral wall of the heating element or the insulating support attached directly or with the aid of an intermediate mounting part, in particular screwed. It can be provided in particular that the intermediate mounting part is fixed in the bottom region of the heating element and extends in the region of the outer peripheral wall of the heating element, in which the element is in turn screwed to the intermediate mounting part. In order to adjust the contact pressure or the contact surface of the element and thus, inter alia, the thermal coupling of the element to the underside of the hob plate, the Element on the outer peripheral wall of the heating element at different heights be screwed.

Gemäß einer bevorzugten Ausführungsform ist der Temperaturfühler an der Unterseite des Elementes befestigt. Dadurch kann zum einen eine große plane Auflagefläche zur Verbesserung der Wärmeleitung von der Unterseite der Glaskeramikplatte zum Temperaturfühler realisiert werden. Zum anderen ist der Temperaturfühler durch das flächenmäßig größere Element im Montageprozeß, z.B. beim Herunterfallen der Einheit Element/Temperaturfühler, besser mechanisch geschützt.According to a preferred embodiment, the temperature sensor is attached to the underside of the element. As a result, on the one hand, a large plane contact surface for improving the heat conduction from the underside of the glass ceramic plate to the temperature sensor can be realized. On the other hand, the temperature sensor is characterized by the larger area element in the assembly process, e.g. when falling the unit element / temperature sensor, better mechanically protected.

Zur Vereinfachung der Montage kann das Element einen Aufnahmeabschnitt für den Temperaturfühler und einen Montageabschnitt für die Befestigung des Elementes, insbesondere im Heizelement, aufweisen, wobei der Aufnahmeabschnitt radial seitlich versetzt zum Montageabschnitt liegt. Dies ist insbesondere dann wichtig, wenn der Temperaturfühler in unmittelbarer Nähe eines bei dem Heizelement vorhandenen Temperaturbegrenzers montiert werden soll. Durch den Temperaturbegrenzer ist nämlich der Montageplatz im Bereich der Außenumfangswand des Heizelementes beschränkt, andererseits ist es jedoch günstig, wenn die verschiedenen elektrischen Anschlüsse des Temperaturbegrenzers und des Temperaturfühlers so nahe wie sicherheitstechnisch erlaubt beieinander liegen.To simplify the assembly, the element may have a receiving portion for the temperature sensor and a mounting portion for the attachment of the element, in particular in the heating element, wherein the receiving portion is radially laterally offset from the mounting portion. This is particularly important if the temperature sensor is to be mounted in the immediate vicinity of a temperature limiter present in the heating element. By the temperature limiter namely the mounting space in the region of the outer peripheral wall of the heating element is limited, on the other hand, it is favorable if the various electrical connections of the temperature limiter and the temperature sensor are as close as safety-friendly together.

Vorteilhafterweise ist das Element zumindest zweiteilig ausgebildet. Ein Aufnahmeteil für den Temperaturfühler besteht dabei aus einen weicheren Material, um den Aufnahmeteil anwendungs- und sicherheitstechnisch spezifisch optimal geometrisch umformen zu können. Der Rest des Elementes kann aus einem anderen Material bestehen, wobei insbesondere ein Federmaterial geeignet ist, um das Element definiert an die Unterseite der Glaskeramikplatte andrücken zu können.Advantageously, the element is formed at least in two parts. A receiving part for the temperature sensor consists of a softer material in order to be able to geometrically reshape the receiving part in an application-specific and safety-related manner. The remainder of the element may consist of a different material, wherein in particular a spring material is suitable for being able to press the element in a defined manner against the underside of the glass-ceramic plate.

Fertigungs- und montagetechnisch besonders günstig ist es, wenn das Element als Torsionsfeder ausgebildet ist, wobei der Torsionsbereich des Federelementes im wesentlichen außerhalb des Heizelementes und damit in einem kühleren Bereich vorgesehen ist.Manufacturing and assembly technology is particularly advantageous if the element is designed as a torsion spring, wherein the torsion region of the spring element is provided substantially outside the heating element and thus in a cooler area.

Gemäß einer bevorzugten Ausführungsform ist das Element elektrisch leitfähig ausgebildet sowie geerdet, um um bei einfachem Aufbau den Sicherheitsvorschriften optimal zu genügen.According to a preferred embodiment, the element is designed to be electrically conductive and grounded in order to optimally meet the safety regulations with a simple structure.

Zur Vereinfachung der Montage und insbesondere zur Zugentlastung sind die elektrischen Leitungen des Temperaturfühlers mit einem ersten Anschlussabschnitt des Elementes oder einem dort montierten Anschlussstück verbunden. Entsprechend kann auch das Element einen zweiten Anschlussabschnitt aufweisen, an dem eine Erdungsleitung des Elementes angeschlossen ist.To simplify the assembly and in particular for strain relief, the electrical leads of the temperature sensor are connected to a first connection portion of the element or a fitting mounted there. Accordingly, the element can also have a second connection section, to which a grounding line of the element is connected.

Nachfolgend sind anhand schematischer Darstellungen drei Ausführungsbeispiele des erfindungsgemäßen Kochfeldes und Heizelementes bzw. Elementes für das Heizelement beschrieben. Es zeigen:

Fig. 1
in einer Schnittdarstellung im wesentlichen entlang der Linie I-I in Fig. 2 das Kochfeld mit einem Heizelement gemäß dem ersten Ausführungsbeispiel,
Fig. 2
in einer perspektivischen Ansicht von oben das Heizelement alleine gemäß dem ersten Ausführungsbeispiel,
Fig. 3
in vergrößertem Maßstab in einer perspektivischen Ansicht von unten das Wärmeleitelement aus Fig. 1 und Fig. 2 ohne den Temperaturfühler,
Fig. 4
stark vereinfacht in einer Schnittdarstellung abschnittsweise das Heizelement mit dem Wärmeleitelement gemäß dem zweiten Ausführungsbeispiel,
Fig. 5
in einer Ansicht von oben abschnittsweise das Heizelement mit dem Wärmeleitelement gemäß dem dritten Ausführungsbeispiel, und
Fig. 6
ein Blockschaltbild des erfindungsgemäßen Kochfeldes.
Below are described with reference to schematic representations of three embodiments of the hob according to the invention and heating element or element for the heating element. Show it:
Fig. 1
in a sectional view substantially along the line II in Fig. 2, the hob with a heating element according to the first embodiment,
Fig. 2
in a perspective view from above, the heating element alone according to the first embodiment,
Fig. 3
on an enlarged scale in a perspective view from below of the heat-conducting element of FIG. 1 and FIG. 2 without the temperature sensor,
Fig. 4
greatly simplified in a sectional view sections of the heating element with the heat conducting element according to the second embodiment,
Fig. 5
in a view from above sections of the heating element with the heat conducting element according to the third embodiment, and
Fig. 6
a block diagram of the hob according to the invention.

Ein Kochfeld 1 weist eine Kochfeldplatte 3, insbesondere aus Glaskeramik, auf (Fig. 1). Unterhalb der Kochfeldplatte 3 sind in an sich bekannter Weise verschiedene Heizelemente 5 des Kochfeldes vorgesehen, die in bekannter Weise an die Unterseite der Kochfeldplatte 3 gedrückt sind (nicht gezeigt). Im Bereich des Heizelementes 5 ist die Kochfeldplatte 3 an ihrer Oberseite üblicherweise entsprechend dekoriert. In diesem beheizten Bereich ist ein Kochgefäß 6 abstellbar. Der Boden des Kochgefäßes 6 liegt im kalten Zustand häufig nur im Randbereich des Heizelementes 5 in einer Ringfläche auf der Kochfeldplatte 3 auf, während im zentralen Restbereich der Topfboden durch einen Luftspalt von der Platte beabstandet ist (Fig. 1). Im erwärmten Zustand verringert sich dieser Luftspalt oder wird idealerweise zu annähernd Null durch die bekannte thermisch bedingte Bewegung des Topfbodens. Das Heizelement 5 besitzt einen napfartigen Blechtopf 7, in dem eine kreisscheibenförmige Isolationsplatte 9 liegt. Weiterhin sind innerhalb des Blechtopfes 7 auf der Isolationsplatte 9 ein innerer Isolationsring 11 sowie ein äußerer Isolationsring 13 entsprechend einer Zweikreis-Heizungsanordnung vorgesehen. Dadurch ist der Innenraum des Heizelementes 5 in einen inneren und einen äußeren Heizbereich getrennt, in dem sich jeweils ein Bandheizleiter 15 erstreckt (Fig. 1, Fig. 2). In an sich bekannter Weise ist im Bereich der Außenumfangswand des Blechtopfes 7 ein Heizleiteranschlussteil 17 befestigt, das einerseits leitend verbunden ist mit den Bandheizleitern 15 und andererseits an nicht gezeigte elektrische Versorgungsleitungen des Kochfeldes 1 anschließbar ist (Fig. 2). Das Heizelement 5 weist weiterhin einen an sich bekannten Temperaturbegrenzer 19 auf, dessen Stab sich quer über den beheizten Bereich des Heizelementes erstreckt. Der Anschlussblock des Temperaturbegrenzers 19 besitzt die bekannten und üblichen, seitlich ausgestellten Kontaktflachsteckstifte zum Anschluß an die Spannungsversorgungsleitung bzw. an das Heizleiteranschlußteil 17 des Heizelementes 5. Zwischen dem inneren lsolationsring und dem äußeren lsolationsring 13 ist im Bereich des Temperaturbegrenzers 19 ein Isolationsblock 21 angeordnet. Dieser kann dazu dienen, den Temperaturbegrenzer 19 im Bereich von unterhalb des Isolationsblocks 21 geführten Abschnitten des Bandheizleiters 15 thermisch gegen diese abzuschirmen. In den Randbereich des lsolationsblocks 21 ist in dessen Oberseite eine Aufnahmevertiefung 23 gefräst. In dieser ist ein Wärmeleitelement 25 mit seiner Elementenhaube 27 angeordnet (Fig. 1, 2, 3). Dabei ist zu beachten, das die Haube 27 nicht unmittelbar auf dem Boden der Vertiefung 23 aufsitzt, damit die Haube 27 bei einem Schlag auf die Kochfeldplatte 3 geringfügig nachgeben kann. Dadurch kann eine Beschädigung oder einen Bruch der Platte 3 vermieden werden, insbesondere wenn sie aus Glas- oder Glaskeramikmaterial ist.A hob 1 has a hob plate 3, in particular made of glass ceramic, on (Fig. 1). Below the hob plate 3 are different in a conventional manner Heating elements 5 of the hob provided, which are pressed in a known manner to the underside of the hob plate 3 (not shown). In the region of the heating element 5, the hob plate 3 is usually decorated accordingly on its upper side. In this heated area a cooking vessel 6 is shut off. The bottom of the cooking vessel 6 is in the cold state often only in the edge region of the heating element 5 in an annular surface on the hob plate 3, while in the central residual region of the pot bottom is spaced by an air gap from the plate (Fig. 1). In the heated state, this air gap is reduced or ideally to approximately zero by the known thermally induced movement of the pot bottom. The heating element 5 has a cup-shaped sheet metal pot 7, in which a circular disk-shaped insulation plate 9 is located. Furthermore, an inner insulation ring 11 and an outer insulation ring 13 corresponding to a two-circuit heating arrangement are provided within the sheet metal pot 7 on the insulation plate 9. As a result, the interior of the heating element 5 is separated into an inner and an outer heating region, in each of which a Bandheizleiter 15 extends (Fig. 1, Fig. 2). In known manner, a Heizleiteranschlussteil 17 is fixed in the region of the outer peripheral wall of the sheet metal pot 7, which is on the one hand conductively connected to the Bandheizleitern 15 and on the other hand to not shown electrical supply lines of the hob 1 can be connected (Fig. 2). The heating element 5 also has a known temperature limiter 19, whose rod extends transversely across the heated region of the heating element. The terminal block of the temperature limiter 19 has the known and usual, laterally issued Kontaktflachsteckstifte for connection to the power supply line or to the Heizleiteranschlußteil 17 of the heating element 5. Between the inner insulation ring and the outer insulation ring 13, an insulation block 21 is disposed in the region of the temperature limiter 19. This can serve to thermally shield the temperature limiter 19 in the region of sections of the band heating conductor 15 guided below the insulation block 21. In the edge region of the insulation block 21, a receiving recess 23 is milled in its upper side. In this, a heat-conducting element 25 is arranged with its element hood 27 (FIGS. 1, 2, 3). It should be noted that the hood 27 is not seated directly on the bottom of the recess 23 so that the hood 27 can yield slightly to a blow on the hob plate 3. As a result, damage or breakage of the plate 3 can be avoided, especially if it is made of glass or glass ceramic material.

In den durch die Elementenhaube 27 gebildeten Aufnahmeraum ist mittels eines temperaturbeständigen und wärmeleitenden Keramikklebers 28 als Temperaturfühler 29 ein PT-500-Meßfühler mit seinen Fühlerleitungen 30 eingebettet und dadurch befestigt und geführt. Das Material der Elementenhaube 27 ist X7-Stahl und die Haube 27 ist dazu als Biegeteil ausgeführt. Das Haubenmaterial muss ausreichend gute Wärmeleitungseigenschaften aufweisen, muss gut verformbar sein, wie nachfolgend erläutert ist, jedoch im gesamten Temperaturbereich von bis zu 350 - 400°C ausreichend mechanisch stabil, und seine Eigenschaften auch bei diesen Temperaturen beibehalten. Von dem als Deckwand dienenden Abschnitt der Elementenhaube 27 sind zwei Seitenwände 31 im wesentlichen rechtwinklig nach unten abgebogen (Fig. 3). Ebenfalls rechtwinklig zu den Seitenwänden 31 abgebogen begrenzen Bodenwände 33 einen schlitzförmig geöffneten Boden der Elementenhaube 27. Stirnseitig ist der Aufnahmeraum der Haube durch eine rechtwinklig von der Deckwand abgebogene Stirnwand 35 verschlossen. Durch die haubenförmige Ausbildung des Elementes 25 ist sichergestellt, dass die sicherheitstechnisch vorgeschriebene Luft- und Kriechstrecke zum spannungsführenden Temperaturfühler 29 im Falle eines Bruches der Kochfeldplatte 3 eingehalten ist, ohne die Grundfläche des Elementes 25 bzw. der Haube 27 und damit des Isolationsblockes 21 allzu groß gestalten zu müssen. Genauere Ausführungen zur geometrischen Gestaltung und Anordnung des Temperaturfühlers 29, des Elementes 25 und des Isolationsblockes 21 werden im Zusammenhang mit der Beschreibung des in Fig. 5 skizzierten dritten Ausführungsbeispiels gemacht. Die Haube 27 ist mit einem im wesentlichen L-förmig ausgebildeten Haubenträger 37 aus Stahl fest verbunden, vorzugsweise verschweißt. Dazu sitzt die Elementenhaube 27 auf einem Verbindungsabschnitt 39 des Haubenträgers 37 (Fig. 3). Dadurch ist die Deckwand der Elementenhaube 27 leicht erhöht gegenüber der Oberseite des Haubenträgers 37 angeordnet und definiert und begrenzt einen Flächenbereich A, in dem das Element 25 an der Unterseite des Kochfeldplatte 3 wärmeleitend anliegt (Fig. 1, 2, 5). Durch die überlappende Verbindung von Haube 27 und Haubenträger 37 ist zudem die Stabilität der Verbindung erhöht. Während der Haubenträger 37 aus 0,8 mm starken Material besteht, um für die nachfolgend beschriebenen Erdungs-Steckanschlüsse vorschriftsgerecht geeignet zu sein, besteht die Elementenhaube 27 aus dünnerem Material, was deren Umformung zusätzlich vereinfacht.In the receiving space formed by the element hood 27 is by means of a temperature-resistant and thermally conductive ceramic adhesive 28 as a temperature sensor 29, a PT-500 probe embedded with its sensor leads 30 and thereby secured and guided. The material of the element cover 27 is X7 steel and the hood 27 is designed as a bent part. The hood material must have sufficiently good heat conduction properties, must be well deformable, as explained below, but sufficiently mechanically stable over the entire temperature range of up to 350 - 400 ° C, and retain its properties even at these temperatures. Of the serving as a top wall portion of the element hood 27 two side walls 31 are bent substantially at right angles down (Fig. 3). Also bent at right angles to the side walls 31 define bottom walls 33 a slot-shaped open bottom of the element cover 27. The front side of the receiving space of the hood is closed by a right angle bent from the top wall end wall 35. The hood-like design of the element 25 ensures that the safety-prescribed air and creepage distance to the live temperature sensor 29 is maintained in the event of breakage of the hob plate 3, without the base of the element 25 and the hood 27 and thus of the insulation block 21 too large to have to shape. More detailed explanations on the geometric design and arrangement of the temperature sensor 29, the element 25 and the insulation block 21 are made in connection with the description of the sketched in Fig. 5 third embodiment. The hood 27 is fixedly connected to a substantially L-shaped hood carrier 37 made of steel, preferably welded. For this purpose, the element hood 27 is seated on a connecting section 39 of the hood carrier 37 (FIG. 3). As a result, the top wall of the element hood 27 is slightly elevated relative to the top of the hood support 37 and defines and limits a surface area A in which the element 25 rests on the underside of the hob plate 3 in a heat-conducting manner (FIGS. 1, 2, 5). Due to the overlapping connection of hood 27 and hood carrier 37, the stability of the connection is also increased. While the cage carrier 37 is made of 0.8 mm thick material in order to be suitable for the earthing plug-in connections described below, the element cover 27 is made of thinner material, which additionally simplifies their forming.

Der Haubenträger 37 geht in einem Federabschnitt 41 in einen Montageabschnitt 43 über (Fig. 2, 3). Dabei ist der Federabschnitt 41 im wesentlichen außerhalb des beheizten Bereiches des Heizelementes 5 bzw. des äußeren lsolationsringes 13 angeordnet. Der Montageabschnitt 43 des Haubenträgers 37 besitzt eine rechtwinklig nach unten abgebogene Montageplatte 45 mit Montageöffnungen 47. Durch die Montageöffnungen 47 kann das Wärmeleitelement 25 höhenmäßig einstellbar über ein Zwischenmontageteil 48 an der Außenumfangswand des Blechtopfes 7 befestigt werden (Fig. 2). Dazu ist vorgesehen, dass das Zwischenmontageteil 48 einerseits an der Unterseite des Blechtopfes 7 in dessen Boden verschraubt ist (nicht gezeigt). Dieses Teil 48 erstreckt sich etwa L-förmig von dem Boden des Heizelementes bis zu seiner Seitenwand 7. Im Seitenwandbereich ist dann das Wärmeleitelement 25 mit dem Zwischenmontageteil 48 verschraubt und so höhenmäßig die Lage des Wärmeleitelementes 25 definiert festlegbar. So können aufwendige Verschraubungsöffnungen in der Seitenwand des Blechtopfes 7 entfallen und die bereits bodenseitig im Blechtopf stets vorhandenen Öffnungen können genutzt werden. Alternativ kann das Wärmeleitelement 25 jedoch auch im Bereich der Montageöffnungen 47 mit der Aussenwand des Blechtopfes 7 verschraubt sein. Weiterhin kann in den Montageöffnungen 47 ein Anschlussteil befestigt werden (nicht gezeigt), mit dem einerseits die elektrischen Fühlerleitungen 30 des Temperaturfühlers 29 verbindbar, z.B. ansteckbar, sind und an dem andererseits elektrische Verbindungsleitungen einer Steuereinheit 101 (Fig. 6) des Kochfeldes 1 angeschlossen sind. Dadurch ist eine sichere Zugentlastung für die Fühlerleitungen 30 bereitgestellt. Durch das Anschlussteil ist weiterhin sicherzustellen, dass die elektrischen Anschlüsse des PT-Temperaturfühlers 29 gegenüber Masse bzw. dem geerdeten Haubenträger 37 isoliert werden. Der Temperaturfühler und die Fühlerleitungen 30 sind über ihre gesamt Länge von dem Wärmeleitelement 25 deckseitig abgedeckt. Zur besseren Führung der Leitungen 30 können diese an der Unterseite des Elementes 25 im Bereich des Haubenträgers 37 angeklebt und/oder durch am Träger 37 ausgebildete Führungselemente gehalten sein. Weiterhin weist die Montageplatte 45 einen Flachstift 49 auf, an dem eine Erdungsleitung 51 bzw. deren genormter AMP-Stecker des Kochfeldes unmittelbar ansteckbar ist. Dadurch ist das Wärmeleitelement 25 auf Massepotential gelegt. Dabei ist sicherzustellen, class der ohmsche Widerstand des Elementes 25 bei einem Wert von 0,1 Ohm oder weniger liegt, um einer Dauerstrombelastung von mindestens 25 A standhalten zu können. Weiterhin darf das Wärmeleitelement 25 auch nicht zu steif ausgeführt sein, um bei mechanischer Belastung bzw. Bewegung der Kochfeldplatte 3 geeignet nachgeben zu können. Andernfalls wären durch ein zu steifes Anliegen des Elementes 25 bzw. der Elementenhaube 27 an der Kochfeldplatte 3 Kochplatten-Abplatzer an der Unterseite der Platte 3 oder gegebenenfalls auch deren Bruch zu befürchten. Weiterhin ist zu beachten, dass eine Verbesserung der Wärmeleitung von der Unterseite der Kochfeldplatte 3 zum Wärmeleitelement 25 zu erreichen ist, wenn die Zwischenräume zwischen den an der Unterseite von Glaskeramikplatte ausgebildeten Noppen mit einer wärmeleitenden Paste bzw. einem geeigneten Kleber ausgefüllt werden.The hood carrier 37 merges in a spring section 41 into a mounting section 43 (FIGS. 2, 3). In this case, the spring portion 41 is arranged substantially outside the heated region of the heating element 5 and the outer insulation ring 13. The mounting portion 43 of the hood support 37 has a rectangularly downward bent mounting plate 45 with mounting holes 47. Through the mounting holes 47, the heat-conducting element 25 height adjustable via an intermediate mounting member 48 on the outer peripheral wall of the sheet metal pot 7 are fixed (Fig. 2). For this purpose, it is provided that the intermediate mounting part 48 is bolted on the one hand to the underside of the sheet metal pot 7 in the bottom thereof (not shown). This part 48 extends approximately L-shaped from the bottom of the heating element to its side wall 7. In the sidewall area, the heat-conducting element 25 is then screwed to the intermediate mounting part 48 and thus defined in terms of height the position of the heat-conducting element 25 defined. Thus, consuming Verschraubungsöffnungen omitted in the side wall of the sheet metal pot 7 and the already bottom side in the tin pot always existing openings can be used. Alternatively, however, the heat-conducting element 25 can also be screwed to the outer wall of the sheet-metal pot 7 in the region of the assembly openings 47. Furthermore, in the mounting holes 47, a connection part can be attached (not shown), with the one hand, the electrical sensor leads 30 of the temperature sensor 29 connectable, eg attachable, and are connected to the other hand electrical connection lines of a control unit 101 (Fig. 6) of the hob 1 , As a result, a secure strain relief for the sensor lines 30 is provided. By the connection part is further to ensure that the electrical connections of the PT temperature sensor 29 to ground or the grounded hood carrier 37 are isolated. The temperature sensor and the sensor lines 30 are covered over the entire length of the heat-conducting element 25 deck. For better guidance of the lines 30, these can be glued to the underside of the element 25 in the region of the hood carrier 37 and / or held by guide elements formed on the carrier 37. Furthermore, the mounting plate 45 has a flat pin 49 to which a grounding line 51 and their standardized AMP plug of the hob is directly pluggable. As a result, the heat-conducting element 25 is set to ground potential. It must be ensured that the ohmic resistance of the element 25 is at a value of 0.1 ohms or less in order to withstand a continuous current load of at least 25 A. Furthermore, the allowed Heat-conducting element 25 should also not be designed to be stiff in order to be able to yield properly under mechanical load or movement of the hob plate 3. Otherwise would be feared by a too stiff concern of the element 25 and the element cover 27 on the hob plate 3 hotplate chipping on the underside of the plate 3 or possibly also their breakage. Furthermore, it should be noted that an improvement of the heat conduction from the underside of the hob plate 3 to the heat-conducting element 25 can be achieved if the spaces between the nubs formed on the underside of the glass ceramic plate are filled with a thermally conductive paste or a suitable adhesive.

Bei dem Kochfeld bzw. dem Heizelement gemäß dem zweiten Ausführungsbeispiel sind aus Vereinfachungsgründen, soweit möglich, dieselben Bezugszeichen wie bei der Beschreibung des ersten Ausführungsbeispiels verwendet. In Fig. 4 ist abschnittsweise in einer Schnittdarstellung quer zur Längserstreckung des Elementes und damit etwa senkrecht zur Linie I-I in Fig. 2 der Bereich des Kochfeldes gezeigt, in dem der Temperturfühler 29 zusammen mit einem Wärmeleitelement 75 im Bereich des Isolationsblocks 21 ähnlich dem ersten Ausführungsbeispiel angeordnet ist. Im Unterschied zum ersten Ausführungsbeispiel weist das Wärmeleitelement 25 keine Elementenhaube, sondern eine Elementenschale 77 auf. Diese Elementenschale ist ebenfalls in einer geeigneten Aufnahmevertiefung 23 des lsolationsblockes 21 angeordnet. Die Isolationsschale liegt in ihren Randbereichen in einer Ringfläche unmittelbar an der Unterseite der Glaskeramikplatte 3 an und steht dadurch mit ihr in wärmeleitender Verbindung. In der Elementenschale 77 ist der Temperaturfühler 29 angeordnet, wobei die Schale zusätzlich durch eine Wärmeleitpaste gefüllt ist. Das nicht näher gezeigte Wärmeleitelement 75 könnte ansonsten wie das Wärmeleitelement 25 des ersten Ausführungsbeispieles ausgeformt sein. Aus sicherheitstechnischen Gründen ist der Temperaturfühler 29 jedoch mit einer Schutzkleinspannung betrieben oder überträgt sein Messsignal berührungslos aus dem Heizelement.In the cooking hob or the heating element according to the second embodiment, for simplicity, as far as possible, the same reference numerals as in the description of the first embodiment are used. In Fig. 4 is shown in sections in a cross-sectional view transversely to the longitudinal extent of the element and thus approximately perpendicular to the line II in Fig. 2 of the hob shown in which the temperature sensor 29 together with a heat conducting element 75 in the region of the insulation block 21 similar to the first embodiment is arranged. In contrast to the first embodiment, the heat-conducting element 25 has no element hood, but rather an element shell 77. This element shell is likewise arranged in a suitable receiving depression 23 of the insulation block 21. The insulation shell lies in its edge regions in an annular surface directly on the underside of the glass ceramic plate 3 and is thus in thermally conductive connection with it. In the element shell 77, the temperature sensor 29 is arranged, wherein the shell is additionally filled by a thermal paste. The heat conducting element 75 not shown in detail could otherwise be shaped like the heat conducting element 25 of the first embodiment. For safety reasons, however, the temperature sensor 29 is operated with a safety extra-low voltage or transmits its measuring signal without contact from the heating element.

Gemäß dem dritten Ausführungsbeispiel nach Fig. 5 weist das beispielsweise haubenförmig gestaltete Wärmeleitelement 85 eine Elementenhaube 87 auf, die der des ersten Ausführungsbeispieles entspricht. Im Unterschied zum ersten Ausführungsbeispiel ist ein Montageabschnitt 89 des Haubenträgers 37 jedoch nicht seitlich radial versetzt zum Aufnahmeabschnitt der Elementenhaube 87 angeordnet. Vielmehr erstreckt sich der Montageabschnitt 89 in Verlängerung der Elementenhaube 87 radial unversetzt entlang der Außenwand des Blechtopfes 7 senkrecht nach unten. In Fig. 5 ist schematisiert dargestellt, in welchem Flächenbereich A das Wärmeleitelement 85 thermisch in Kontakt steht mit der Unterseite der Kochfeldplatte 3. Die Größe der Fläche beträgt dabei etwa 50 bis 100 mm2 . Auch ist dargestellt, dass die Kontaktfläche A ungefähr etwa 10 mal größer ist als eine Grundfläche B des Temperaturfühlers 29. Dadurch ist unter anderem sichergestellt, dass die Temperatur an der Unterseite der Kochfeldplatte durch den Temperaturfühler nicht quasi punktförmig, sondern über einen größeren Flächenbereich integrierend ermittelt wird. Dies ist insbesondere deshalb wichtig, weil der jeweilige Pfannendurchmesser und dessen Bodenbeschaffenheit nicht genau bekannt sind und zusätzlich von Pfannentyp zu Pfannentyp schwanken können. Ein seitlicher MindestAbstand a des Elementes 85 zum Randbereich des Isolationsmaterials 21 beträgt etwa 8 mm. Dadurch ist eine optimale Geometrie bereitgestellt, die folgende Vorteile für die genaue Regelung der Heizleistung bzw. der Temperatur insbesondere bei Bratvorgängen in auf der Kochfeldplatte 3 abgestellten Pfannen 6 aufweist. Der Temperaturfühler 29 und die Elementenhaube 27 sind durch den Isolationsblock 21 zum einen ausreichend gegen die von dem Bandheizleiter 15 ausgehende Wärmestrahlung abgeschirmt. Zum anderen ist der Isolationsblock noch klein genug, um beim Heizen bzw. Braten eine nachteilige Abschattung des Kochgefäßbodens 6 und eine dadurch verursachte unerwünscht ungleichmäßige Wärmeverteilung im Pfannenboden vermeiden zu können. Insbesondere ist das Wärmeleitelement 25 noch ausreichend gut thermisch an den Bereich der Kochfeldplatte angekoppelt, der unmittelbar durch die Wärmestrahlung des Heizmittels 15 erhitzt wird. Dies ist zudem beim ersten und beim dritten Ausführungsbeispiel erreicht, wobei zugleich der Temperaturfühler 29 gegenüber der Kochfeldplatte 3 durch ein geerdetes Schutzelement 27 unter Beachtung der vorschriftsgemäß geforderten 4- bzw. 8 mm-Kriech- und Luftstrecke abgedeckt ist. Auch ist durch die Vergrößerung der mit der Unterseite der Kochfeldplatte 3 thermisch in Kontakt stehenden Fläche erreicht, das trotz aller Montagetoleranzen ein ausreichend guter Wärmekontakt zwischen dem flächenmäßig kleineren Temperaturfühler und der Kochfeldplatte 3 hergestellt ist. Dies ist insbesondere dann wichtig, wenn eine an der Unterseite genoppte Glaskeramik-Kochfeldplatte 3 verwendet wird, deren Noppengeometrie in der Größenordnung des Temperaturfühlers 29 liegt. Obige Aussagen zur Gestaltung der Geometrien, Abstände und Größenverhältnisse gelten für alle drei Ausführungsbeispiele. Gegebenfalls wird die Messfläche A durch einen Hochtemperaturschmierstoff an die Kochfeldplattenunterseite, die insbesondere aus Glaskeramikmaterial besteht, angekoppelt, um einen verbesserten Wärmeübergang und bei Schlagbelastung eine verbesserte Dämpfung zu erzielen.According to the third exemplary embodiment according to FIG. 5, the heat-conducting element 85 designed in the shape of a hood, for example, has an element hood 87 which corresponds to that of the first exemplary embodiment. In contrast to the first embodiment, however, a mounting portion 89 of the hood carrier 37 is not laterally offset radially arranged to the receiving portion of the element hood 87. Rather, the mounting portion 89 extends in extension of the element cover 87 radially unopposed along the outer wall of the sheet metal pot 7 vertically downwards. In Fig. 5 is shown schematically in which area A, the heat conducting element 85 is thermally in contact with the underside of the hob plate 3. The size of the surface is about 50 to 100 mm 2 . It is also shown that the contact surface A is about 10 times larger than a base B of the temperature sensor 29. This ensures, inter alia, that the temperature at the bottom of the cooktop panel by the temperature sensor not quasi point-like, but determined integrating over a larger area becomes. This is particularly important because the respective pan diameter and its soil properties are not known exactly and can also vary from pan to pan type. A lateral minimum distance a of the element 85 to the edge region of the insulating material 21 is about 8 mm. As a result, an optimum geometry is provided, which has the following advantages for the precise regulation of the heating power or the temperature, in particular in frying operations in pans 6 placed on the hob plate 3. The temperature sensor 29 and the element hood 27 are shielded by the insulation block 21 on the one hand sufficiently against the emanating from the Bandheizleiter 15 thermal radiation. On the other hand, the insulation block is still small enough to avoid an adverse shading of the cooking vessel bottom 6 and thereby caused undesirable uneven heat distribution in the pan bottom when heating or frying. In particular, the heat-conducting element 25 is still sufficiently thermally coupled to the region of the hob plate, which is heated directly by the heat radiation of the heating means 15. This is also achieved in the first and in the third embodiment, wherein at the same time the temperature sensor 29 relative to the hob plate 3 is covered by a grounded protective element 27 in compliance with the required according to 4 or 8 mm creepage and air gap. Also achieved by the increase in the thermally in contact with the underside of the hob plate 3 surface that, despite all mounting tolerances, a sufficiently good thermal contact between the areal smaller temperature sensor and the hob plate 3 is made. This is particularly important when a glass-ceramic hob plate 3, which is knobbed on the underside, is used, whose dimpled geometry lies in the order of magnitude of the temperature sensor 29. Above statements on the design of the geometries, distances and size relationships apply to all three embodiments. Optionally, the measuring surface A is coupled by a high-temperature lubricant to the cooktop plate underside, which consists in particular of glass ceramic material, in order to achieve improved heat transfer and impact resistance improved damping.

In Fig. 6 ist schematisiert ein Blockschaltbild dargestellt, das die wichtigsten Komponenten des Kochfeldes zeigt. Die Steuereinheit 101 regelt die Heizleistung des Bandheizleiters 15 entsprechend den Messwerten des Temperaturfühlers 29 auf den durch eine Eingabeeinheit 103 vorgegebenen Soll-Wert. Dadurch kann insbesondere erreicht werden, dass beim Braten ein Anbrennen nahezu ausgeschlossen ist.FIG. 6 schematically shows a block diagram showing the most important components of the cooktop. The control unit 101 regulates the heating power of the Bandheizleiters 15 according to the measured values of the temperature sensor 29 to the predetermined by an input unit 103 target value. As a result, it can be achieved, in particular, that burning is virtually impossible during roasting.

Claims (10)

  1. Hob with a hob plate (3), below which is arranged at least one heating element (5), for heating a cooking vessel able to be placed on the hob plate, and with a temperature detector (29) for detecting the temperature of the hob plate, which temperature detector within the heating element detects the temperature of the underside of the hob plate and is screened by means of insulating material (21) against the heat radiation of a heating means (15) of the heating element (5) and is connected with a control unit (101) for controlling the heat output of the heating element, characterised in that the temperature detector (29) is disposed in thermally conductive contact with the underside of the hob plate (3) by means of a thermally conductive element (25; 75; 85) and that the element (25; 75; 85) and the temperature detector (29) are screened by means of insulating material (21) against the heat radiation of the heating element (15).
  2. Hob according to claim 1, characterised in that the temperature detector (29) is fastened to the underside of the element (25; 85) and that the element is pressed against the underside of the hob plate (3).
  3. Hob according to claim 1 or 2, characterised in that the area region A of the element (25; 85), which is disposed in thermal contact with the underside of the hob plate (3) is approximately at least 5 times, particularly approximately 10 times, larger than the plan area B of the temperature detector (29).
  4. Hob according to one of the preceding claims, characterised in that a lateral spacing a of the element (25; 75; 85) from the edge region of the insulating material (21) amounts to approximately 6 to 12 millimetres, particularly approximately 8 millimetres.
  5. Hob according to one of the preceding claims, characterised in that the temperature detector (29) is arranged in the region of a temperature limiter (19) of the heating element (5).
  6. Hob according to one of the preceding claims, characterised in that the temperature detector is fastened to the element (25; 75; 85) by being cast therein.
  7. Hob according to one of the preceding claims, characterised in that the element (25; 75; 85) is constructed as a spring element and, with limitation to the region of the temperature detector (29), is pressed against the underside of the hob plate (3).
  8. Hob according to one of the preceding claims, characterised in that the element (25; 85) is constructed to be approximately hood-shaped at least in the region of the temperature detector (29) and in that case has an upper and skirt-like lateral walls (31; 35).
  9. Hob according to claim 8, characterised in that the hood (27; 87) is closed at least partly at the base side.
  10. Heating element for a hob according to one of the preceding claims.
EP01905751A 2000-02-16 2001-02-08 Cooking surface comprising a temperature sensor Expired - Lifetime EP1258171B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10006956A DE10006956A1 (en) 2000-02-16 2000-02-16 Cooker hob zone has temperature sensor in thermal contact with underside of hob plate via heat conducting element and screened against thermal radiation from heater by insulating material
DE10006956 2000-02-16
PCT/EP2001/001385 WO2001062048A1 (en) 2000-02-16 2001-02-08 Cooking surface comprising a temperature sensor

Publications (2)

Publication Number Publication Date
EP1258171A1 EP1258171A1 (en) 2002-11-20
EP1258171B1 true EP1258171B1 (en) 2006-09-27

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EP01905751A Expired - Lifetime EP1258171B1 (en) 2000-02-16 2001-02-08 Cooking surface comprising a temperature sensor

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US (1) US6753509B2 (en)
EP (1) EP1258171B1 (en)
AT (1) ATE341180T1 (en)
DE (2) DE10006956A1 (en)
WO (1) WO2001062048A1 (en)

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Also Published As

Publication number Publication date
ATE341180T1 (en) 2006-10-15
DE10006956A1 (en) 2001-08-23
WO2001062048A1 (en) 2001-08-23
EP1258171A1 (en) 2002-11-20
DE50111092D1 (en) 2006-11-09
US20030029858A1 (en) 2003-02-13
US6753509B2 (en) 2004-06-22

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