EP1258170A1 - Cooking surface comprising a temperature sensor - Google Patents

Cooking surface comprising a temperature sensor

Info

Publication number
EP1258170A1
EP1258170A1 EP01903691A EP01903691A EP1258170A1 EP 1258170 A1 EP1258170 A1 EP 1258170A1 EP 01903691 A EP01903691 A EP 01903691A EP 01903691 A EP01903691 A EP 01903691A EP 1258170 A1 EP1258170 A1 EP 1258170A1
Authority
EP
European Patent Office
Prior art keywords
heating element
temperature sensor
hob
heating
area
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01903691A
Other languages
German (de)
French (fr)
Other versions
EP1258170B1 (en
Inventor
Dan Neumayer
Franz Grätz
Monika Zeraschi
Peter Vetterl
Uwe Has
Markus Theine
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
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP1258170A1 publication Critical patent/EP1258170A1/en
Application granted granted Critical
Publication of EP1258170B1 publication Critical patent/EP1258170B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/746—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
  • Such a hob is known from the publication DE 37 03 768 C2, whereby a device for detecting the temperature of a glass ceramic plate heated by means of heating coils or halogen lamps with a temperature sensor is disclosed. This gives a signal corresponding to the temperature of the glass ceramic
  • Control circuit from The heating windings or the halogen lamps are arranged in the interior of a pot-like insulation support and heat the glass ceramic plate via direct radiation.
  • the edge of the insulation support rests on the underside of the glass ceramic plate under spring tension, and the temperature sensor is outside the interior of the insulation support, but inside the heating element. arranged
  • the temperature sensor is still in a heat-conducting connection with the underside of the glass ceramic plate, the temperature sensor being arranged in a receptacle in the edge of the insulating support.
  • the receptacle is arranged at a distance x from the inside of the edge of the insulating support, the minimum value of which is selected such that when it is switched on Switching the heating windings or the halogen lamps on and off only have a negligible influence on the temperature sensor.
  • the maximum value of the distance x is chosen so that the delay due to the thermal conductivity of the glass ceramic plate results in a small hysteresis.
  • the distance x has been found Widths from 3 mm to 6 mm have been found to be advantageous.
  • the temperature sensor is inserted into the inserted or printed receptacle on the top of the extension, which protrudes into the interior of the insulating support, and is in white with the underside of the glass ceramic plate Sleeve-conductive connection
  • the temperature sensor is held indirectly 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 low
  • a heating element for a cooking unit with a temperature sensor is known from the document EP 0 021 107 A1.
  • a heat transfer element in the form of a sheet is used , which partially covers the heated area between the radiators and the glass ceramic plate, but protrudes from the heating element and is there connected to the temperature sensor of the controller.
  • the heat transfer element is attached to the edge of the shell supporting the heating by clamping and is normally attached to the Underside of the glass ceramic plate on From the area of the heat dissipating
  • Heat transfer element protrudes an outer section outwards beyond the edge of the heating element.It is formed in one piece with the aforementioned area, essentially parallel to it, but offset slightly downward by a bend, so that the outer section does not abut the underside of the glass ceramic plate
  • the temperature sensor is attached to the underside of the by a compression spring
  • Heat transfer surface of the heat transfer element is printed, which is supported on a holding mechanism that guides the sensor socket and is attached to the outer section of the heat transfer element.
  • a holding mechanism that guides the sensor socket and is attached to the outer section of the heat transfer element.
  • sensors are also possible.
  • an electrical NTC or PTC sensor can also be used, which is spring loaded or is fixedly attached to the outer section of the heat transfer element.
  • the heat transfer element can, if desired, be grounded, which provides protection against contact
  • a glass ceramic cooktop is known from US Pat. No. 4,447,710, in which an insulation body is arranged in the edge region of the heating element, on which a
  • Temperature sensor for example a thermocouple sits The thermocouple is kept in good thermal contact with the underside of the glass ceramic plate by means of the insulation block
  • the object of the present invention is to provide a generic cooktop and a corresponding heating element, which has good measurement accuracy with simple assembly According to the invention this is achieved in that in a cooktop according to the preamble of claim 1, the temperature sensor is attached to an element which extends from an area inside the heating element to an area outside the heating element, and in that the element has a receiving section inside the heating element for has the temperature sensor and a mounting section for attaching the element, in particular to the heating element, and / or a connection section for connecting at least one electrical line outside the heating element, which receiving section is radially laterally offset from the mounting section or connection section.
  • the relative position of the temperature sensor to the element and their heat conduction behavior are precisely defined and it is a preassembled erable and testable in advance as well as easy to handle in terms of assembly technology, because a larger, unit is provided.
  • the simultaneous attachment of the temperature sensor to the element is therefore optimally coupled to the hob plate or to a cooking pot placed thereon, with easy positioning and mounting of the temperature sensor
  • the temperature sensor is arranged in the area of a temperature limiter of the heating element.
  • all electrical connections can be spatially combined in an assembly-technically advantageous manner, and on the other hand, the respective minimum distances between the electrical connections are reliably maintained by the temperature limiter in accordance with the relevant VDE regulations the installation space in the area of the outer peripheral wall of the heating element is restricted, but on the other hand it is advantageous if the various electrical connections of the temperature limiter and the temperature sensor are as close as possible in a safety-related manner
  • the heat-conducting element is fastened, in particular screwed, directly or with the aid of an intermediate assembly part in the region of the outer circumferential wall of the heating element or the insulation support Heating element is attached and extends into the area 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 be able to adjust the contact pressure or the contact surface of the element and thus
  • the temperature sensor is attached to the underside of the element.
  • this allows a large, flat contact surface to improve the heat conduction from the underside of the glass ceramic plate to the temperature sensor.
  • the temperature sensor is due to the flat-sized larger element in the assembly process, e.g. B when the element / temperature sensor unit falls down, better mechanically protected
  • 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 optimally deform the receiving part specifically in terms of application and safety technology.
  • the rest of the element can consist of a different material, in particular a spring material being suitable, in order to be able to print the element on the underside of the glass ceramic plate
  • the element is designed as a torsion spring, the torsion area of the spring element being provided essentially outside the heating element and thus in a cooler area.
  • a particularly compact structural unit is produced if the spring is essentially L-shaped
  • the element is designed to be electrically conductive and grounded in order to optimally meet the safety regulations with a simple structure
  • the heating element of the heating element is shielded from outgoing heat radiation
  • the electrical lines of the temperature sensor are connected to a first connection section of the element or a connection piece mounted there.
  • the element can also have a second connection section, on which one
  • FIG. 1 is a sectional view substantially along the line l-l in FIG. 2, the hob with a heating element according to the first exemplary embodiment
  • FIG. 2 is a perspective view from above of the heating element alone according to the first exemplary embodiment
  • FIG. 4 is a greatly simplified sectional view of the heating element with the heat-conducting element according to the second exemplary embodiment
  • Fig. 5 in a view from above in sections of the heating element with the heat conducting element according to the third exemplary embodiment
  • FIG. 6 shows a block diagram of the hob according to the invention
  • a cooktop 1 has a cooktop plate 3, in particular made of glass ceramic (FIG. 1). Below the cooktop plate 3 there are various types known per se
  • Heating elements 5 of the cooktop are provided, which are printed in a known manner on the underside of the cooktop plate 3 (not shown).
  • the cooktop plate 3 is usually appropriately decorated on the top side.
  • a cooking vessel 6 can be placed.
  • the bottom of the cooking vessel 6 in the cold state is often only in the ring area of the heating element 5 in an annular surface on the hob plate 3, while in the central remaining area the pan base is spaced from the plate by an air gap (FIG. 1). In the heated state, this air gap decreases or ideally becomes almost zero due to the known thermally induced movement of the pot base
  • the heating element 5 has a cup-like tin pot 7, in which a circular disk-shaped insulation plate 9 also holds.
  • Tin pot 7 attached to a heating conductor connection part 17, which is conductively connected on the one hand to the band heating conductors 15 and on the other hand can be connected to electrical supply lines (not shown) of the hob 1 (FIG. 2).
  • the heating element 5 also has a temperature limiter 19 known per se, the rod of which extends across extends the heated area of the heating element
  • Temperature limiter 19 has the known and customary, laterally flared contact pins for connection to the voltage supply line or to the heating conductor connection part 17 of the heating element 5.
  • An insulation block 21 is arranged in the area of the temperature limiter 19 between the inner insulation ring and the outer insulation ring 13. the temperature limiter 19 in
  • a receiving recess 23 is milled in the upper side thereof.
  • a heat conducting element 25 with its element hood 27 is arranged in this (FIGS. 1, 2, 3). It should be noted that the hood 27 does not open directly sits on the bottom of the recess 23 so that the hood 27 can yield slightly when struck on the hob plate 3. Damage or breakage of the plate 3 can be avoided, in particular if it is made of glass or glass ceramic material
  • a PT-500 sensor with its sensor lines 30 is embedded and thereby fastened and guided by means of a temperature-resistant and heat-conductive ceramic adhesive 28 as the temperature sensor 29.
  • the material of the element cover 27 is X7 steel and the cover 27 is for this purpose designed as a bent part
  • the hood material must have sufficiently good heat conduction properties, must be easily 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
  • the hood-shaped design of the element 25 ensures that the air and creepage distance to the live temperature sensor 29, which is prescribed in terms of safety technology, is maintained in the event of a break in the hob plate 3, without the base surface of the element 25 or the hood 27 and thus the insulation block 21
  • the hood 27 has an essentially L-shaped hood support 37 made of steel firmly connected, preferably welded. For this purpose, the element hood 27 sits on a
  • the top wall of the element hood 27 is slightly raised relative to the top of the hood support 37 arranged and defines and delimits a flat 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).
  • the overlapping connection of the hood 27 and the hood support 37 also increases the stability of the connection, while the hood support 37 consists of 0.8 mm thick material, in order to be suitable for the earthing plug connections described below, the element cover 27 consists of thinner material, which further simplifies its reshaping
  • the hood support 37 merges into a mounting section 43 in a spring section 41 (FIGS. 2, 3).
  • the spring section 41 is arranged essentially outside the heated area of the heating element 5 or the outer insulation ring 13
  • the mounting section 43 of the hood support 37 has a mounting plate 45 with mounting openings 47 which is bent downwards at a right angle.
  • the mounting openings 47 allow the heat-conducting element 25 to be attached to the outer circumferential wall of the tin pot 7 in a highly adjustable manner via an intermediate mounting part 48 (FIG. 2) on the one hand at the bottom of the
  • Tin pot 7 is screwed into its bottom (not shown) This part 48 extends approximately L-shaped from the bottom of the heating element to its side wall 7. In the side wall area, the heat-conducting element 25 is then screwed to the intermediate mounting part 48 and so the position of the heat-conducting element 25 is high Can be defined in a defined manner This allows complex screw openings in the side wall of the
  • Tin pot 7 is omitted and the openings that are always present on the bottom side of the tin pot can be used as an alternative.
  • the heat-conducting element 25 can also be screwed to the outer wall of the tin pot 7 in the area of the mounting openings 47.
  • a connecting part can be fastened in the mounting holes 47 (not shown), with the one hand the electrical sensor lines 30 of the
  • Temperature sensors 29 can be connected, for example plugged in, and to which, on the other hand, electrical connecting lines of a control unit 101 (FIG. 6) of the hob 1 are connected. This provides a secure strain relief for the sensor lines 30.
  • the connecting part furthermore ensures that the electrical connections of the PT -Temperature sensor 29 to ground or grounded
  • Hood support 37 are insulated
  • the temperature sensor and the sensor lines 30 are covered over their entire length by the heat conducting element 25 on the top side better guidance of the lines 30, these can be glued to the underside of the element 25 in the area of the hood support 37 and / or held by guide elements formed on the support 37.
  • the mounting plate 45 has a flat pin 49 on which an earthing line 51 or its standardized AMP Plug of the cooktop can be plugged in immediately. As a result, the heat-conducting element 25 is open
  • the ohmic resistance of the element 25 is at a value of 0.1 ohm or less in order to withstand a continuous current load of at least 25 A.
  • the heat-conducting element 25 must also not be too stiff to prevent mechanical To be able to give in to the load or movement of the cooktop plate 3 in a suitable manner, otherwise there was a risk that the element 25 or the element hood 27 would be too stiff against the cooktop plate 3 or the chip breaker on the underside of the plate 3 or, if necessary, its breakage.
  • FIG. 4 sections are in a sectional representation transverse to the longitudinal extension of the element and thus approximately perpendicular to line II in FIG. 2 the area of the hob is shown in which the temperature sensor 29 is arranged together with a heat-conducting element 75 in the area of the insulation block 21 similar to the first exemplary embodiment.
  • the heat-conducting element 25 has none
  • an element shell 77 on this element shell is also arranged in a suitable receiving recess 23 of the insulation block 21.
  • the edge of the insulation shell lies in an annular area directly on the underside of the glass ceramic plate 3 and is therefore in heat-conducting connection with it in the element shell 77 the temperature sensor 29 is arranged, the shell being additionally filled with a heat-conducting paste.
  • the heat-conducting element 75 could otherwise, like the heat-conducting element 25 of the first exemplary embodiment.
  • the temperature sensor 29 is operated with a protective extra-low voltage or transmits its measurement signal without contact from the heating element
  • the heat-conducting element 85 for example in the form of a hood, has an element hood 87 which corresponds to that of the first exemplary embodiment shows the area A in which the heat-conducting element 85 is thermally in contact with the underside of the hob plate 3.
  • the size of the area is about 50 to 100 mm 2. It is also shown that the contact area A is about 10 times larger than a base area B of the Temperature sensor 29 This ensures, among other things, that the temperature on the underside of the hob plate is not determined by the temperature sensor in a quasi-punctiform manner, but rather integrally over a larger area. This is particularly important because the particular one
  • Pan diameter and its bottom quality are not exactly known and can additionally vary from pan type to pan type.
  • a lateral minimum distance a of the element 85 to the edge region of the insulation material 21 is approximately 8 mm. This provides an optimal geometry, which has the following advantages for the precise regulation of the heating power
  • the temperature sensor 29 and the element cover 27 are adequately shielded by the insulation block 21, on the one hand, against the heat radiation emanating from the band heating conductor 15, and on the other hand, the insulation block is still small enough to be used for cooking To be able to avoid heating or roasting a disadvantageous shading of the cooking vessel base 6 and an undesirably uneven heat distribution in the pan base caused thereby.
  • the heat conducting element 25 is still sufficiently good thermal to the area of the hob plate coupled, which is heated directly by the heat radiation from the heating means 15.
  • the temperature sensor 29 with respect to the hob plate 3 is grounded by a grounded protective element 27, taking into account the 4- or 8-mm Kechech- and air distance is also covered by the enlargement of the Underside of the cooktop 3 thermally in contact with the surface is reached, which, despite all the mounting tolerances, produces a sufficiently good thermal contact between the flat-sized, smaller temperature sensor and the cooktop 3. This is particularly important if a glass ceramic cooktop 3 with a nub on the underside is used, whose Stud geometry on the order of
  • Temperature sensor 29 maintains the above statements on the design of the geometries, distances and large ratios apply to all three exemplary embodiments. If necessary, the measuring area A is coupled to the underside of the hob plate, which consists in particular of glass ceramic material, by means of a high-temperature lubricant in order to achieve improved heat transfer and improved shock absorption when subjected to impact loads
  • FIG. 6 A block diagram is shown schematically in FIG. 6, which shows the most important components of the cooktop.
  • the control unit 101 regulates the heating output of the band heating conductor 15 in accordance with the measured values of the temperature sensor 29 to the desired value specified by an input unit 103 burning is almost impossible

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Cookers (AREA)
  • Control Of Resistance Heating (AREA)
  • Resistance Heating (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

The cooking hob has a ceramic glass hob surface, with at least one heating element (5) positioned beneath it, for heating a cooking pan placed on the hob surface and a temperature sensor (29) within the heating element, for detecting the temperature of the underside of the hob surface, for controlling the heating power for the heating element. The temperature sensor is attached to a fixing element (25) extending from a point within the heating element to a point outside the heating element, with a reception section (27) for the temperature sensor and a fixing section or a connecting section (49) for connecting to an electrical cable (51) at its opposite ends, which are radially and axially offset from one another. Also included are Independent claims for the following: (a) a heating element for a ceramic cooking hob; (b) a fixing element for a temperature sensor for a ceramic hob heating element

Description

Kochfeld mit Temperaturfühler Hob with temperature sensor
Die vorliegende Erfindung betrifft ein Kochfeld nach dem Oberbegriff desThe present invention relates to a hob according to the preamble of
Patentanspruches 1 , sowie ein entsprechendes Heizelement und ein geeignetes ElementClaim 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 eineSuch a hob is known from the publication DE 37 03 768 C2, whereby a device for detecting the temperature of a glass ceramic plate heated by means of heating coils or halogen lamps with a temperature sensor is disclosed. This gives a signal corresponding to the temperature of the glass ceramic
Regelschaltung ab Die Heizwicklungen oder die Halogenlampen sind im Innenraum eines topfartigen Isoliertragers angeordnet und erwarmen die Glaskeramikplatte über direkte Strahlung Der Rand des Isoliertragers liegt an der Unterseite der Glaskeramikplatte unter Federspannung an, und der Temperatursensor ist außerhalb des Innenraums des Isoliertragers, jedoch innerhalb des Heizelementes, angeordnet DerControl circuit from The heating windings or the halogen lamps are arranged in the interior of a pot-like insulation support and heat the glass ceramic plate via direct radiation. The edge of the insulation support rests on the underside of the glass ceramic plate under spring tension, and the temperature sensor is outside the interior of the insulation support, but inside the heating element. arranged The
Temperatursensor steht weiterhin mit der Unterseite der Glaskeramikplatte in wärmeleitender Verbindung, wobei der Temperatursensor in einer Aufnahme im Rand des Isoliertragers angeordnet ist Die Aufnahme ist in einem Abstand x zur Innenseite des Randes des Isoliertragers angeordnet, dessen minimaler Wert so gewählt ist, dass die beim Ein- und Ausschalten der Heizwicklungen oder der Halogenlampen entstehenden kurzzeitigen Temperaturanderungen nur einen vernachlassigbaren 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 eingedruckte Aufnahme auf der Oberseite des Ansatzes, der in den Innenraum des Isoliertragers 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 Warmeubergangswiderstand zwischen der Glaskeramikplatte und dem Temperatursensor klein zu halten 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 Flache des Heizelementes beizubehalten und trotzdem den Temperaturfühler des Reglers eng an die Beheizung zu koppeln, wird ein Warmeubertragungselement 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 Warmeubertragungselement ist auf dem Rand der die Beheizung tragenden Schale durch Festklemmen befestigt und liegt normalerweise an der Unterseite der Glaskeramikplatte an Von dem die Warme abfuhlenden Bereich desThe temperature sensor is still in a heat-conducting connection with the underside of the glass ceramic plate, the temperature sensor being arranged in a receptacle in the edge of the insulating support. The receptacle is arranged at a distance x from the inside of the edge of the insulating support, the minimum value of which is selected such that when it is switched on Switching the heating windings or the halogen lamps on and off only have a negligible influence on the temperature sensor.The maximum value of the distance x is chosen so that the delay due to the thermal conductivity of the glass ceramic plate results in a small hysteresis. The distance x has been found Widths from 3 mm to 6 mm have been found to be advantageous. The temperature sensor is inserted into the inserted or printed receptacle on the top of the extension, which protrudes into the interior of the insulating support, and is in white with the underside of the glass ceramic plate Sleeve-conductive connection The temperature sensor is held indirectly 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 low Furthermore, a heating element for a cooking unit with a temperature sensor is known from the document EP 0 021 107 A1. In order to maintain complete heating of the entire 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 partially covers the heated area between the radiators and the glass ceramic plate, but protrudes from the heating element and is there connected to the temperature sensor of the controller.The heat transfer element is attached to the edge of the shell supporting the heating by clamping and is normally attached to the Underside of the glass ceramic plate on From the area of the heat dissipating
Warmeubertragungselementes ragt ein Aussenabschnitt nach aussen über den Rand des Heizelementes hinaus Er ist einstuckig 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 Fuhlerdose des Temperaturfühlers wird durch eine Druckfeder an die Unterseite derHeat transfer element protrudes an outer section outwards beyond the edge of the heating element.It is formed in one piece with the aforementioned area, essentially parallel to it, but offset slightly downward by a bend, so that the outer section does not abut the underside of the glass ceramic plate The temperature sensor is attached to the underside of the by a compression spring
Warmeubertraguηgsflache des Warmeubertragungselementes angedruckt, die sich an einem die Fuhlerdose fuhrenden, an dem Außenabschnitt des Warmeubertragungselementes angebrachten Haltemechanismus abstutzt Es sind jedoch auch andere Fuhlerarten und -anbringungen möglich So kann beispielsweise auch ein elektrischer NTC- oder PTC-Fuhler verwendet werden, der federnd angedruckt wird oder fest an dem Außenabschnitt des Warmeubertragungselementes angebracht ist Das Warmeubertragungselement kann gewunschtenfalls geerdet werden wodurch ein Beruh- rungsschutz vorliegtHeat transfer surface of the heat transfer element is printed, which is supported on a holding mechanism that guides the sensor socket and is attached to the outer section of the heat transfer element. However, other types and attachments of sensors are also possible. For example, an electrical NTC or PTC sensor can also be used, which is spring loaded or is fixedly attached to the outer section of the heat transfer element. The heat transfer element can, if desired, be grounded, which provides protection against contact
Weiterhin ist aus der Druckschrift US 4,447,710 ein Glaskeramikkochfeld bekannt, bei dem im Randbereich des Heizelementes ein Isolationskorper angeordnet ist, auf dem einFurthermore, a glass ceramic cooktop is known from US Pat. No. 4,447,710, in which an insulation body is arranged in the edge region of the heating element, on which a
Temperaturfühler, beispielsweise ein Thermoelement sitzt Das Thermoelement ist in einem guten thermischen Kontakt mit der Unterseite der Glaskeramikplatte mittels des Isolationsblocks gehaltenTemperature sensor, for example a thermocouple sits The thermocouple is kept 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 gattungsgemaßes Kochfeld und ein ent- sprechendes Heizelement bereitzustellen, das bei einfacher Montage eine gute Meßge- nauigkeit aufweist Erfindungsgemaß ist dies dadurch erreicht, dass bei einem Kochfeld nach dem Oberbegriff des Patentanspruches 1 der Temperaturfühler an einem Element befestigt ist, das sich von einem Bereich innerhalb des Heizelementes in einen Bereich außerhalb des Heizelementes erstreckt, und daß das Element einen Aufnahmeabschnitt innerhalb des Heizelementes für den Temperaturfühler und einen Montageabschnitt für die Befestigung des Elementes, insbesondere am Heizelement, und/oder einen Anschlussabschnitt für den Anschluss zumindest einer elektrischen Leitung jeweils außerhalb des Heizelementes aufweist, welcher Aufnahmeabschnitt radial seitlich versetzt zum Montageabschnitt oder Anschlussabschnitt liegt Erfindungsgemaß sind weiterhin ein entsprechendes Heiz- element sowie ein Element für das Heizelement bereitgestellt Durch den erfindungsgemaßen Aufbau sind die relative Position des Temperaturfühlers zum Element und deren Warmeleitungsverhalten genau festgelegt und es ist eine vormontierbare und vorab testbare sowie montagetechnisch einfach handhabbare, weil größere, Baueinheit bereitgestellt Bei der Montage der Anordnung am Heizelement ist nur noch auf die fehlerfreie Befestigung des Warmeleitelementes am Heizelement zu achten Durch die thermische Ankopplung des wärmeleitenden Elementes an die Unterseite der Kochfeldplatte innerhalb des Heizelementes und die gleichzeitige Befestigung des Temperaturfühlers an dem Element ist also bei einfacher Positionierbarkeit und Montierbarkeit der Temperaturfühler optimal an die Kochfeldplatte bzw an einen darauf abgestellten Kochtopf angekoppeltThe object of the present invention is to provide a generic cooktop and a corresponding heating element, which has good measurement accuracy with simple assembly According to the invention this is achieved in that in a cooktop according to the preamble of claim 1, the temperature sensor is attached to an element which extends from an area inside the heating element to an area outside the heating element, and in that the element has a receiving section inside the heating element for has the temperature sensor and a mounting section for attaching the element, in particular to the heating element, and / or a connection section for connecting at least one electrical line outside the heating element, which receiving section is radially laterally offset from the mounting section or connection section. element and an element for the heating element provided By the structure according to the invention, the relative position of the temperature sensor to the element and their heat conduction behavior are precisely defined and it is a preassembled erable and testable in advance as well as easy to handle in terms of assembly technology, because a larger, unit is provided.When mounting the arrangement on the heating element, only the correct attachment of the heat-conducting element to the heating element needs to be ensured the simultaneous attachment of the temperature sensor to the element is therefore optimally coupled to the hob plate or to a cooking pot placed thereon, with easy positioning and mounting of the temperature sensor
Vorteilhafterweise ist vorgesehen, dass der Temperaturfühler im Bereich eines Temperaturbegrenzers des Heizelementes angeordnet ist Dadurch können einerseits alle elektrischen Anschlüsse in montagetechnisch gunstiger Weise räumlich zusammengefasst angeordnet werden und andererseits sind die jeweiligen Mindestabstande der elektrischen Anschlüsse untereinander entsprechend den einschlagigen VDE-Vorschnften sicher eingehalten Durch den Temperaturbegrenzer ist der Montageplatz im Bereich der Außenumfangswand des Heizelementes beschrankt, andererseits ist es jedoch gunstig, wenn die verschiedenen elektrischen Anschlüsse des Temperaturbegrenzers und des Temperaturfühlers so nahe wie sicherheitstechnisch erlaubt beieinander liegen Um das Element schnell und fehlerfrei montieren zu können, ist vorgesehen, dass das Warmeleitelement im Bereich der Außenumfangswand des Heizelementes bzw des Isoliertragers direkt oder unter Zuhilfenahme eines Zwischenmontageteiles befestigt, insbesondere verεchraubt ist Dabei kann insbesondere vorgesehen sein, dass das Zwischenmontageteil im Boden des Isoliertragers 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 Anpressflache 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 verschiedenenIt is advantageously provided that the temperature sensor is arranged in the area of a temperature limiter of the heating element.On the one hand, all electrical connections can be spatially combined in an assembly-technically advantageous manner, and on the other hand, the respective minimum distances between the electrical connections are reliably maintained by the temperature limiter in accordance with the relevant VDE regulations the installation space in the area of the outer peripheral wall of the heating element is restricted, but on the other hand it is advantageous if the various electrical connections of the temperature limiter and the temperature sensor are as close as possible in a safety-related manner In order to be able to assemble the element quickly and without errors, it is provided that the heat-conducting element is fastened, in particular screwed, directly or with the aid of an intermediate assembly part in the region of the outer circumferential wall of the heating element or the insulation support Heating element is attached and extends into the area 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 be able to adjust the contact pressure or the contact surface of the element and thus, among other things, the thermal coupling of the element to the underside of the hob plate , the element on the outer circumferential wall of the heating element in different
Hohen anschraubbar seinHigh screwable
Gemäß einer bevorzugten Ausfuhrungsform ist der Temperaturfühler an der Unterseite des Elementes befestigt Dadurch kann zum einen eine große plane Auflageflache zur Verbesserung der Warmeleitung von der Unterseite der Glaskeramikplatte zum Tempera- turfuhler realisiert werden Zum anderen ist der Temperaturfühler durch das flachenmaßig größere Element im Montageprozeß, z B beim Herunterfallen der Einheit Element/Temperaturfühler, besser mechanisch geschütztAccording to a preferred embodiment, the temperature sensor is attached to the underside of the element. On the one hand, this allows a large, flat contact surface to improve the heat conduction from the underside of the glass ceramic plate to the temperature sensor. On the other hand, the temperature sensor is due to the flat-sized larger element in the assembly process, e.g. B when the element / temperature sensor unit falls down, better mechanically protected
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 Federmateπal geeignet ist, um das Element definiert an die Unterseite der Glaskeramikplatte andrucken zu könnenAdvantageously, 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 optimally deform the receiving part specifically in terms of application and safety technology. The rest of the element can consist of a different material, in particular a spring material being suitable, in order to be able to print the element on the underside of the glass ceramic plate
Fertigungs- und montagetechnisch besonders gunstig ist es, wenn das Element als Torsionsfeder ausgebildet ist wobei der Torsionsbereich des Federelementes im wesentlichen außerhalb des Heizelementes und damit in einem kuhleren Bereich vorgesehen ist Ein besonders kompakte Baueinheit entsteht, wenn die Feder im wesentlichen L-formig ausgebildet ist Gemäß einer bevorzugten Ausfuhrungsform ist das Element elektrisch leitfahig ausgebildet sowie geerdet, um bei einfachem Aufbau den Sicherheitsvorschriften optimal zu genügenIt is particularly economical in terms of manufacturing and assembly technology if the element is designed as a torsion spring, the torsion area of the spring element being provided essentially outside the heating element and thus in a cooler area.A particularly compact structural unit is produced if the spring is essentially L-shaped 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
Um eine ausreichende Meßgenauigkeit zu erhalten, ist sowohl der Temperaturfühler als auch das Element mittels eines Isolationskorpers ausreichend gegen von einemIn order to obtain sufficient measuring accuracy, both the temperature sensor and the element by means of an insulation body are sufficient against one
Heizmittel des Heizelementes ausgehende Wärmestrahlung abgeschirmtThe heating element of the heating element is shielded from outgoing heat radiation
Zur Vereinfachung der Montage und insbesondere zur Zugentlastung sind die elektrischen Leitungen des Temperaturfühlers mit einem ersten Anschlussabschnitt des Elementes oder einem dort montierten Anschlussstuck verbunden Entsprechend kann auch das Element einen zweiten Anschlussabschnitt aufweisen, an dem eineTo simplify assembly and in particular to relieve strain, the electrical lines of the temperature sensor are connected to a first connection section of the element or a connection piece mounted there. Accordingly, the element can also have a second connection section, on which one
Erdungsleitung des Elementes angeschlossen istEarthing line of the element is connected
Nachfolgend sind anhand schematischer Darstellungen drei Ausfuhrungsbeispiele des erfmdungsgemaßen Kochfeldes und Heizelementes bzw Elementes für das Heizelement beschriebenThree exemplary embodiments of the hob and heating element or element for the heating element according to the invention are described below using schematic representations
Es zeigenShow it
Fig 1 in einer Schnittdarstellung im wesentlichen entlang der Linie l-l in Fig 2 das Kochfeld mit einem Heizelement gemäß dem ersten Ausfuhrungsbeispiel,1 is a sectional view substantially along the line l-l in FIG. 2, the hob with a heating element according to the first exemplary embodiment,
Fig 2 in einer perspektivischen Ansicht von oben das Heizelement alleine gemäß dem ersten Ausfuhrungsbeispiel,2 is a perspective view from above of the heating element alone according to the first exemplary embodiment,
Fig 3 in vergrößertem Maßstab in einer perspektivischen Ansicht von unten dasFig. 3 on an enlarged scale in a perspective view from below
Warmeleitelement aus Fig 1 und Fig 2 ohne den Temperaturfühler,Heat conducting element from FIG. 1 and FIG. 2 without the temperature sensor,
Fig 4 stark vereinfacht in einer Schnittdarstellung abschnittsweise das Heizelement mit dem Warmeleitelement gemäß dem zweiten Ausfuhrungsbeispiel, Fig. 5 in einer Ansicht von oben abschnittsweise das Heizelement mit dem Warmeleitelement gemäß dem dritten Ausfuhrungsbeispiel und4 is a greatly simplified sectional view of the heating element with the heat-conducting element according to the second exemplary embodiment, Fig. 5 in a view from above in sections of the heating element with the heat conducting element according to the third exemplary embodiment and
Fig 6 ein Blockschaltbild des erfmdungsgemaßen Kochfeldes6 shows 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 verschiedeneA cooktop 1 has a cooktop plate 3, in particular made of glass ceramic (FIG. 1). Below the cooktop plate 3 there are various types known per se
Heizelemente 5 des Kochfeldes vorgesehen, die in bekannter Weise an die Unterseite der Kochfeldplatte 3 gedruckt sind (nicht gezeigt) Im Bereich des Heizelementes 5 ist die Kochfeldplatte 3 an ihrer Oberseite üblicherweise entsprechend dekoriert In diesem beheizten Bereich ist ein Kochgefaß 6 abstellbar Der Boden des Kochgefaßes 6 liegt im kalten Zustand häufig nur im Randbereich des Heizelementes 5 in einer Ringflache auf der Kochfeldplatte 3 auf, wahrend 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 kreisscheibenformige Isolationsplatte 9 hegt Weiterhin sind innerhalb des Blechtopfes 7 auf der Isolationsplatte 9 ein innerer Isolationsring 1 1 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 desHeating elements 5 of the cooktop are provided, which are printed in a known manner on the underside of the cooktop plate 3 (not shown). In the area of the heating element 5, the cooktop plate 3 is usually appropriately decorated on the top side. In this heated area, a cooking vessel 6 can be placed. The bottom of the cooking vessel 6 in the cold state is often only in the ring area of the heating element 5 in an annular surface on the hob plate 3, while in the central remaining area the pan base is spaced from the plate by an air gap (FIG. 1). In the heated state, this air gap decreases or ideally becomes almost zero due to the known thermally induced movement of the pot base The heating element 5 has a cup-like tin pot 7, in which a circular disk-shaped insulation plate 9 also holds. Inside the tin pot 7 on the insulation plate 9 there is an inner insulation ring 11 and an outer insulation ring 13 corresponding to a branch ikreis heating arrangement provided This separates the interior of the heating element 5 into an inner and an outer heating area, in each of which a band heating conductor 15 extends (Fig. 1, Fig. 2) In a manner known per se, in the area of the outer peripheral wall
Blechtopfes 7 ein Heizleiteranschlussteil 17 befestigt, das einerseits leitend verbunden ist mit den Bandheizleitem 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 desTin pot 7 attached to a heating conductor connection part 17, which is conductively connected on the one hand to the band heating conductors 15 and on the other hand can be connected to electrical supply lines (not shown) of the hob 1 (FIG. 2). The heating element 5 also has a temperature limiter 19 known per se, the rod of which extends across extends the heated area of the heating element
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 Isolationsπng und dem äußeren Isolationsring 13 ist im Bereich des Temperaturbegrenzers 19 ein Iso- lationsblock 21 angeordnet Dieser kann dazu dienen, den Temperaturbegrenzer 19 imTemperature limiter 19 has the known and customary, laterally flared contact pins for connection to the voltage supply line or to the heating conductor connection part 17 of the heating element 5. An insulation block 21 is arranged in the area of the temperature limiter 19 between the inner insulation ring and the outer insulation ring 13. the temperature limiter 19 in
Bereich von unterhalb des Isolationsblocks 21 geführten Abschnitten des Bandheizleiters 15 thermisch gegen diese abzuschirmen In den Randbereich des Isolationsblocks 21 ist in dessen Oberseite eine Aufnahmevertiefung 23 gefräst In dieser ist ein Warmeleitelement 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 Glaskeramikmateπal istArea of sections of the strip heating conductor guided below the insulation block 21 15 thermally shield against them In the edge area of the insulation block 21, a receiving recess 23 is milled in the upper side thereof. A heat conducting element 25 with its element hood 27 is arranged in this (FIGS. 1, 2, 3). It should be noted that the hood 27 does not open directly sits on the bottom of the recess 23 so that the hood 27 can yield slightly when struck on the hob plate 3. Damage or breakage of the plate 3 can be avoided, in particular 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-Meßfuhler mit seinen Fuhlerleitungen 30 eingebettet und dadurch befestigt und gefuhrt Das Material der Elementenhaube 27 ist X7-Stahl und die Haube 27 ist dazu als Biegeteil ausgeführt Das Haubenmateπal muss ausreichend gute Warmeleitungseigenschaften 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 beibehaltenIn the receiving space formed by the element cover 27, a PT-500 sensor with its sensor lines 30 is embedded and thereby fastened and guided by means of a temperature-resistant and heat-conductive ceramic adhesive 28 as the temperature sensor 29. The material of the element cover 27 is X7 steel and the cover 27 is for this purpose designed as a bent part The hood material must have sufficiently good heat conduction properties, must be easily 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
Von dem als Deckwand dienenden Abschnitt der Elementenhaube 27 sind zwei Seitenwande 31 im wesentlichen rechtwinklig nach unten abgebogen (Fig 3) Ebenfalls rechtwinklig zu den Seltenwanden 31 abgebogen begrenzen Bodenwande 33 einen schlitzförmig geöffneten Boden der Elementenhaube 27 Stirnseitig ist der Aufnahmeraum der Haube durch eine rechtwinklig von der Deckwand abgebogeneFrom the section of the element hood 27 that serves as the top wall, two side walls 31 are bent downward at essentially right angles (FIG. 3). Also bent at right angles to the rare walls 31, bottom walls 33 delimit a slot-shaped open bottom of the element hood 27 the top wall is bent
Stirnwand 35 verschlossen Durch die haubenformige 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 Grundflache des Elementes 25 bzw der Haube 27 und damit des Isolationsblockes 21 allzu groß gestalten zu müssen Genauere Ausfuhrungen 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 Ausfuhrungsbeispiels gemacht Die Haube 27 ist mit einem im wesentlichen L-formig ausgebildeten Haubentrager 37 aus Stahl fest verbunden, vorzugsweise verschweißt Dazu sitzt die Elementenhaube 27 auf einemEnd wall 35 closed The hood-shaped design of the element 25 ensures that the air and creepage distance to the live temperature sensor 29, which is prescribed in terms of safety technology, is maintained in the event of a break in the hob plate 3, without the base surface of the element 25 or the hood 27 and thus the insulation block 21 To have to design too large More precise designs for 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 third exemplary embodiment outlined in FIG. 5. The hood 27 has an essentially L-shaped hood support 37 made of steel firmly connected, preferably welded. For this purpose, the element hood 27 sits on a
Verbindungsabschnitt 39 des Haubentragers 37 (Fig 3) Dadurch ist die Deckwand der Elementenhaube 27 leicht erhöht gegenüber der Oberseite des Haubentragers 37 angeordnet und definiert und begrenzt einen Flachenbereich 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 Haubentrager 37 ist zudem die Stabilität der Verbindung erhöht Wahrend der Haubentrager 37 aus 0,8 mm starken Material besteht, um für die nachfolgend beschriebenen Erdungs-Steckanschlusse vorschriftsgerecht geeignet zu sein, besteht die Elementenhaube 27 aus dünnerem Material, was deren Umformung zusätzlich vereinfachtConnecting section 39 of the hood support 37 (FIG. 3) As a result, the top wall of the element hood 27 is slightly raised relative to the top of the hood support 37 arranged and defines and delimits a flat 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). The overlapping connection of the hood 27 and the hood support 37 also increases the stability of the connection, while the hood support 37 consists of 0.8 mm thick material, in order to be suitable for the earthing plug connections described below, the element cover 27 consists of thinner material, which further simplifies its reshaping
Der Haubentrager 37 geht in einem Federabschnitt 41 in einen Montageabschnitt 43 über (Fig 2, 3) Dabei ist der Federabschnitt 41 im wesentlichen außerhalb des beheizten Be- reiches des Heizelementes 5 bzw des äußeren Isolationsringes 13 angeordnet DerThe hood support 37 merges into a mounting section 43 in a spring section 41 (FIGS. 2, 3). The spring section 41 is arranged essentially outside the heated area of the heating element 5 or the outer insulation ring 13
Montageabschnitt 43 des Haubentragers 37 besitzt eine rechtwinklig nach unten abgebogene Montageplatte 45 mit Montageoffnungen 47 Durch die Montageoffnungen 47 kann das Warmeleitelement 25 hohenmaßig 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 desThe mounting section 43 of the hood support 37 has a mounting plate 45 with mounting openings 47 which is bent downwards at a right angle. The mounting openings 47 allow the heat-conducting element 25 to be attached to the outer circumferential wall of the tin pot 7 in a highly adjustable manner via an intermediate mounting part 48 (FIG. 2) on the one hand at the bottom of the
Blechtopfes 7 in dessen Boden verschraubt ist (nicht gezeigt) Dieses Teil 48 erstreckt sich etwa L-formig von dem Boden des Heizelementes bis zu seiner Seitenwand 7 Im Seitenwandbereich ist dann das Warmeleitelement 25 mit dem Zwischenmontageteil 48 verschraubt und so hohenmaßig die Lage des Warmeleitelementes 25 definiert festlegbar So können aufwendige Verschraubungsoffnungen in der Seitenwand desTin pot 7 is screwed into its bottom (not shown) This part 48 extends approximately L-shaped from the bottom of the heating element to its side wall 7. In the side wall area, the heat-conducting element 25 is then screwed to the intermediate mounting part 48 and so the position of the heat-conducting element 25 is high Can be defined in a defined manner This allows complex screw openings in the side wall of the
Blechtopfes 7 entfallen und die bereits bodenseitig im Blechtopf stets vorhandenen Offnungen können genutzt werden Alternativ kann das Warmeleitelement 25 jedoch auch im Bereich der Montageoffnungen 47 mit der Aussenwand des Blechtopfes 7 verschraubt sein Weiterhin kann in den Montageoffnungen 47 ein Anschlussteil befestigt werden (nicht gezeigt), mit dem einerseits die elektrischen Fuhlerleitungen 30 desTin pot 7 is omitted and the openings that are always present on the bottom side of the tin pot can be used as an alternative. However, the heat-conducting element 25 can also be screwed to the outer wall of the tin pot 7 in the area of the mounting openings 47. Furthermore, a connecting part can be fastened in the mounting holes 47 (not shown), with the one hand the electrical sensor lines 30 of the
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 Fuhlerleitungen 30 bereitgestellt Durch das Anschlussteil ist weiterhin sicherzustellen, dass die elektrischen Anschlüsse des PT-Temperaturfuhlers 29 gegenüber Masse bzw dem geerdetenTemperature sensors 29 can be connected, for example plugged in, and to which, on the other hand, electrical connecting lines of a control unit 101 (FIG. 6) of the hob 1 are connected. This provides a secure strain relief for the sensor lines 30. The connecting part furthermore ensures that the electrical connections of the PT -Temperature sensor 29 to ground or grounded
Haubentrager 37 isoliert werden Der Temperaturfühler und die Fuhlerleitungen 30 sind über ihre gesamt Lange von dem Warmeleitelement 25 deckseitig abgedeckt Zur besseren Fuhrung der Leitungen 30 können diese an der Unterseite des Elementes 25 im Bereich des Haubentragers 37 angeklebt und/oder durch am Trager 37 ausgebildete Fuhrungselemente 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 Warmeleitelement 25 aufHood support 37 are insulated The temperature sensor and the sensor lines 30 are covered over their entire length by the heat conducting element 25 on the top side better guidance of the lines 30, these can be glued to the underside of the element 25 in the area of the hood support 37 and / or held by guide elements formed on the support 37. Furthermore, the mounting plate 45 has a flat pin 49 on which an earthing line 51 or its standardized AMP Plug of the cooktop can be plugged in immediately. As a result, the heat-conducting element 25 is open
Massepotential gelegt Dabei ist sicherzustellen, dass der ohmsche Widerstand des Elementes 25 bei einem Wert von 0, 1 Ohm oder weniger hegt, um einer Dauerstrombelastung von mindestens 25 A standhalten zu können Weiterhin darf das Warmeleitelement 25 auch nicht zu steif ausgeführt sein, um bei mechanischer Belastung bzw Bewegung der Kochfeldplatte 3 geeignet nachgeben zu können Andernfalls waren 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 befurchten Weiterhin ist zu beachten, dass eine Verbesserung der Warmeleitung von der Unterseite der Kochfeldplatte 3 zum Warme- leitelement 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 werdenGround potential must be ensured that the ohmic resistance of the element 25 is at a value of 0.1 ohm or less in order to withstand a continuous current load of at least 25 A. Furthermore, the heat-conducting element 25 must also not be too stiff to prevent mechanical To be able to give in to the load or movement of the cooktop plate 3 in a suitable manner, otherwise there was a risk that the element 25 or the element hood 27 would be too stiff against the cooktop plate 3 or the chip breaker on the underside of the plate 3 or, if necessary, its breakage. Furthermore, it should be noted that An improvement in 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 knobs formed on the underside of the glass ceramic plate are filled with a heat-conducting paste or a suitable adhesive
Bei dem Kochfeld bzw dem Heizelement gemäß dem zweiten Ausfuhrungsbeispiel sind aus Vereinfachungsgrunden, soweit möglich, dieselben Bezugszeichen wie bei der Beschreibung des ersten Ausfuhrungsbeispiels verwendet In Fig 4 ist abschnittsweise in einer Schnittdarstellung quer zur Langserstreckung des Elementes und damit etwa senkrecht zur Linie l-l in Fig 2 der Bereich des Kochfeldes gezeigt, in dem der Temperturfuhler 29 zusammen mit einem Warmeleitelement 75 im Bereich des Isolationsblocks 21 ahnlich dem ersten Ausfuhrungsbeispiel angeordnet ist Im Unterschied zum ersten Ausfuhrungsbeispiel weist das Warmeleitelement 25 keineFor simplification reasons, the same reference numerals as in the description of the first exemplary embodiment are used in the cooktop or the heating element according to the second exemplary embodiment. In FIG. 4, sections are in a sectional representation transverse to the longitudinal extension of the element and thus approximately perpendicular to line II in FIG. 2 the area of the hob is shown in which the temperature sensor 29 is arranged together with a heat-conducting element 75 in the area of the insulation block 21 similar to the first exemplary embodiment. In contrast to the first exemplary embodiment, the heat-conducting element 25 has none
Elementenhaube, sondern eine Elementenschale 77 auf Diese Elementenschale ist ebenfalls in einer geeigneten Aufnahmevertiefung 23 des Isolationsblockes 21 angeordnet Die Isolationsschale liegt in ihren Randbereichen in einer Ringflache 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 Warmeleitpaste gefüllt ist Das nicht naher gezeigte Warmeleitelement 75 konnte ansonsten wie das Warmeleitelement 25 des ersten Ausfuhrungsbeispieles ausgeformt sein Aus sicherheitstechnischen Gründen ist der Temperaturfühler 29 jedoch mit einer Schutzkleinspannung betrieben oder übertragt sein Messsignal beruhrungslos aus dem HeizelementElement cover, but an element shell 77 on this element shell is also arranged in a suitable receiving recess 23 of the insulation block 21. The edge of the insulation shell lies in an annular area directly on the underside of the glass ceramic plate 3 and is therefore in heat-conducting connection with it in the element shell 77 the temperature sensor 29 is arranged, the shell being additionally filled with a heat-conducting paste. The heat-conducting element 75 (not shown in more detail) could otherwise, like the heat-conducting element 25 of the first exemplary embodiment. For safety reasons, the temperature sensor 29 is operated with a protective extra-low voltage or transmits its measurement signal without contact from the heating element
Gemäß dem dritten Ausfuhrungsbeispiel nach Fig 5 weist das beispielsweise haubenformig gestaltete Warmeleitelement 85 eine Elementenhaube 87 auf, die der des ersten Ausfuhrungsbeispieles entspricht Wie im ersten Ausfuhrungsbeispiel ist ein Montageabschnitt 89 des Haubentragers 37 seitlich radial versetzt zum Aufnahmeabschnitt der Elementenhaube 87 angeordnet In Fig 5 ist schematisiert dargestellt, in welchem Flachenbereich A das Warmeleitelement 85 thermisch in Kontakt steht mit der Unterseite der Kochfeldplatte 3 Die Große der Flache betragt dabei etwa 50 bis 100 mm2 Auch ist dargestellt, dass die Kontaktflache A ungefähr etwa 10 mal großer ist als eine Grundflache B des Temperaturfühlers 29 Dadurch ist unter anderem sichergestellt, dass die Temperatur an der Unterseite der Kochfeldplatte durch den Temperaturfühler nicht quasi punktformig, sondern über einen größeren Flachenbereich integrierend ermittelt wird Dies ist insbesondere deshalb wichtig, weil der jeweiligeAccording to the third exemplary embodiment according to FIG. 5, the heat-conducting element 85, for example in the form of a hood, has an element hood 87 which corresponds to that of the first exemplary embodiment shows the area A in which the heat-conducting element 85 is thermally in contact with the underside of the hob plate 3. The size of the area is about 50 to 100 mm 2. It is also shown that the contact area A is about 10 times larger than a base area B of the Temperature sensor 29 This ensures, among other things, that the temperature on the underside of the hob plate is not determined by the temperature sensor in a quasi-punctiform manner, but rather integrally over a larger area. This is particularly important because the particular one
Pfannendurchmesser und dessen Bodenbeschaffenheit nicht genau bekannt sind und zusatzlich von Pfannentyp zu Pfannentyp schwanken können Ein seitlicher Mindest- Abstand a des Elementes 85 zum Randbereich des Isolationsmateπals 21 betragt etwa 8 mm Dadurch ist eine optimale Geometrie bereitgestellt, die folgende Vorteile für die genaue Regelung der Heizleistung bzw der Temperatur insbesondere bei Bratvorgangen 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 Kochgefaßbodens 6 und eine dadurch verursachte unerwünscht ungleichmäßige Warmeverteilung im Pfannenboden vermeiden zu können Insbesondere ist das Warmeleitelement 25 noch ausreichend gut thermisch an den Bereich der Kochfeldplatte angekoppelt, der unmittelbar durch die Wärmestrahlung des Heizmitteis 15 erhitzt wird Dies ist zudem beim ersten und beim dritten Ausfuhrungsbeispiel erreicht wobei zugleich der Temperaturfühler 29 gegenüber der Kochfeldplatte 3 durch ein geerdetes Schutzelement 27 unter Beachtung der vorschnftsgemaß geforderten 4- bzw 8 mm-Kπech- und Luftstrecke abgedeckt ist Auch ist durch die Vergrößerung der mit der Unterseite der Kochfeldplatte 3 thermisch in Kontakt stehenden Flache erreicht, das trotz aller Montagetoieranzen ein ausreichend guter Warmekontakt zwischen dem flachenmaßig 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 desPan diameter and its bottom quality are not exactly known and can additionally vary from pan type to pan type. A lateral minimum distance a of the element 85 to the edge region of the insulation material 21 is approximately 8 mm. This provides an optimal geometry, which has the following advantages for the precise regulation of the heating power The temperature sensor 29 and the element cover 27 are adequately shielded by the insulation block 21, on the one hand, against the heat radiation emanating from the band heating conductor 15, and on the other hand, the insulation block is still small enough to be used for cooking To be able to avoid heating or roasting a disadvantageous shading of the cooking vessel base 6 and an undesirably uneven heat distribution in the pan base caused thereby. In particular, the heat conducting element 25 is still sufficiently good thermal to the area of the hob plate coupled, which is heated directly by the heat radiation from the heating means 15. This is also achieved in the first and in the third exemplary embodiment. At the same time, the temperature sensor 29 with respect to the hob plate 3 is grounded by a grounded protective element 27, taking into account the 4- or 8-mm Kechech- and air distance is also covered by the enlargement of the Underside of the cooktop 3 thermally in contact with the surface is reached, which, despite all the mounting tolerances, produces a sufficiently good thermal contact between the flat-sized, smaller temperature sensor and the cooktop 3. This is particularly important if a glass ceramic cooktop 3 with a nub on the underside is used, whose Stud geometry on the order of
Temperaturfühlers 29 hegt Obige Aussagen zur Gestaltung der Geometrien, Abstände und Großenverhaltnisse gelten für alle drei Ausfuhrungsbeispiele Gegebenfalls wird die Messflache A durch einen Hochtemperaturschmierstoff an die Kochfeldplattenunterseite, die insbesondere aus Glaskeramikmateπal besteht, angekoppelt, um einen verbesserten Wärmeübergang und bei Schlagbelastung eine verbesserte Dampfung zu erzielenTemperature sensor 29 maintains the above statements on the design of the geometries, distances and large ratios apply to all three exemplary embodiments. If necessary, the measuring area A is coupled to the underside of the hob plate, which consists in particular of glass ceramic material, by means of a high-temperature lubricant in order to achieve improved heat transfer and improved shock absorption when subjected to impact loads
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 A block diagram is shown schematically in FIG. 6, which shows the most important components of the cooktop. The control unit 101 regulates the heating output of the band heating conductor 15 in accordance with the measured values of the temperature sensor 29 to the desired value specified by an input unit 103 burning is almost impossible

Claims

Patentansprücheclaims
Kochfeld mit einer Kochfeldplatte (3), unterhalb der zumindest ein HeizelementHob with a hob plate (3), below which at least one heating element
(5) angeordnet ist zur Erwärmung eines auf der Kochfeldplatte abstellbaren Kochgefaßes, und mit einem Temperaturfühler (29) zum Erfassen der(5) is arranged for heating a cooking vessel that can be placed on the hob plate, and with a temperature sensor (29) for detecting the
Temperatur der Kochfeldplatte, welcher Temperaturfühler innerhalb des Heizelementes die Temperatur der Unterseite der Kochfeldplatte abfuhlt und verbunden ist mit einer Steuereinheit (101 ) zum Steuern der Heizleistung des Heizelementes (5), dadurch gekennzeichnet, daß der Temperaturfühler (29) an einem Element (25) befestigt ist, das sich von einem Bereich innerhalb desTemperature of the hob, which temperature sensor inside the heating element senses the temperature of the underside of the hob and is connected to a control unit (101) for controlling the heating power of the heating element (5), characterized in that the temperature sensor (29) is connected to an element (25) is attached, which extends from an area within the
Heizelementes in einen Bereich außerhalb des Heizelementes (5) erstreckt, und daß das Element (25) einen Aufnahmeabschnitt (27) innerhalb des Heizelementes für den Temperaturfühler (29) und einen Montageabschnitt (47) für die Befestigung des Elementes, insbesondere am Heizelement (5), und/oder einen Anschlussabschnitt (49) für den Anschluss zumindest einer elektrischen Leitung (51 ) jeweils außerhalb des Heizelementes aufweist, welcher Aufnahmeabschnitt (27) radial seitlich versetzt zum Montageabschnitt (47) oder Anschlussabschnitt (49) liegtHeating element extends into an area outside the heating element (5), and that the element (25) has a receiving section (27) inside the heating element for the temperature sensor (29) and a mounting section (47) for fastening the element, in particular on the heating element (5 ), and / or a connection section (49) for the connection of at least one electrical line (51) each outside of the heating element, which receiving section (27) is radially laterally offset from the mounting section (47) or connection section (49)
Kochfeld nach Anspruch 1 , dadurch gekennzeichnet, daß der TemperaturfühlerHob according to claim 1, characterized in that the temperature sensor
(29) an der Unterseite des Elementes (25) befestigt ist(29) is attached to the underside of the element (25)
Kochfeld nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß dadurch gekennzeichnet, daß das Element (25) im Bereich des Aufnahmeabschnittes (27) an die Unterseite der Kochfeldplatte (3) gedruckt istHob according to claim 1 or 2, characterized in that the element (25) is printed in the area of the receiving section (27) on the underside of the hob plate (3)
Kochfeld nach Anspruch 1 , 2 oder 3, dadurch gekennzeichnet, daß das Element (25) als Torsionsfeder ausgebildet ist, und daß der Torsionsbereich (41 ) des Federelementes im wesentlichen außerhalb des Heizelementes (5) vorgesehen istHob according to claim 1, 2 or 3, characterized in that the element (25) is designed as a torsion spring and that the torsion area (41) of the spring element is provided essentially outside the heating element (5)
Kochfeld nach Anspruch 4, dadurch gekennzeichnet, daß die Torsionsfeder (25) im wesentlichen L-formig ausgebildet istHob according to claim 4, characterized in that the torsion spring (25) is substantially L-shaped
Kochfeld nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Element (25) an oder im Bereich der Aussenumfangswand des Heizelementes (5) befestigt, insbesondere angeschraubt istHob according to one of the preceding claims, characterized in that the element (25) is attached, in particular screwed, to or in the region of the outer peripheral wall of the heating element (5)
Kochfeld nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Temperaturfühler (29) im Bereich eines Temperaturbegrenzers (19) des Heizelementes (5) angeordnet istHob according to one of the preceding claims, characterized in that the temperature sensor (29) is arranged in the region of a temperature limiter (19) of the heating element (5)
Kochfeld nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Temperaturfühler (29) und das Element (25) mittels Isolationsmateπal (21 ) gegen von einem Heizmittel (15) des Heizelementes (5) ausgehende Wärmestrahlung abgeschirmt sindHob according to one of the preceding claims, characterized in that the temperature sensor (29) and the element (25) are shielded by means of insulation material (21) against heat radiation emitted by a heating means (15) of the heating element (5)
Kochfeld nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Element (25) einen ersten Anschlussabschnitt (47) im Bereich des Montageabschnittes (43) aufweist, in dem die elektrischen Leitungen (30) des Temperaturfühlers (29) angeschlossen sindHob according to one of the preceding claims, characterized in that the element (25) has a first connection section (47) in the region of the mounting section (43), in which the electrical lines (30) of the temperature sensor (29) are connected
Kochfeld nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Element (25) einen zweiten Anschlussabschnitt (49) im Bereich des Montageabschnittes (43) aufweist, an dem eine Erdungsleitung (51 ) des Elementes (25) angeschlossen istHob according to one of the preceding claims, characterized in that the element (25) has a second connection section (49) in the region of the mounting section (43), to which an earth line (51) of the element (25) is connected
Heizelement für ein Kochfeld nach einem der vorhergehenden AnsprücheHeating element for a hob according to one of the preceding claims
Element für ein Heizelement nach Anspruch 11 Element for a heating element according to claim 11
EP01903691A 2000-02-16 2001-02-02 Cooking surface comprising a temperature sensor Expired - Lifetime EP1258170B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10006954A DE10006954A1 (en) 2000-02-16 2000-02-16 Ceramic cooking hob has temperature sensor supported by fixing element extending from point on outside of heating element in contact with underside of hob surface on inside of heating element
DE10006954 2000-02-16
PCT/EP2001/001145 WO2001062046A1 (en) 2000-02-16 2001-02-02 Cooking surface comprising a temperature sensor

Publications (2)

Publication Number Publication Date
EP1258170A1 true EP1258170A1 (en) 2002-11-20
EP1258170B1 EP1258170B1 (en) 2007-12-19

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ID=7631126

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EP01903691A Expired - Lifetime EP1258170B1 (en) 2000-02-16 2001-02-02 Cooking surface comprising a temperature sensor

Country Status (5)

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US (1) US6580058B2 (en)
EP (1) EP1258170B1 (en)
AT (1) ATE381875T1 (en)
DE (2) DE10006954A1 (en)
WO (1) WO2001062046A1 (en)

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Also Published As

Publication number Publication date
US6580058B2 (en) 2003-06-17
WO2001062046A1 (en) 2001-08-23
US20030024923A1 (en) 2003-02-06
ATE381875T1 (en) 2008-01-15
DE50113397D1 (en) 2008-01-31
EP1258170B1 (en) 2007-12-19
DE10006954A1 (en) 2001-10-11

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