EP2649860B1 - Heating device for a household appliance and household appliance comprising such a heating device - Google Patents

Heating device for a household appliance and household appliance comprising such a heating device Download PDF

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Publication number
EP2649860B1
EP2649860B1 EP11791274.1A EP11791274A EP2649860B1 EP 2649860 B1 EP2649860 B1 EP 2649860B1 EP 11791274 A EP11791274 A EP 11791274A EP 2649860 B1 EP2649860 B1 EP 2649860B1
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European Patent Office
Prior art keywords
substrate
heating device
layer
recess
temperature
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EP11791274.1A
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German (de)
French (fr)
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EP2649860A1 (en
Inventor
Ingo Bally
Alexander Dinkel
Wolfgang Fuchs
Claudia Leitmeyr
Angelika Namberger
Michael Reindl
Klemens Roch
Wolfgang Schnell
Matthias Sorg
Günter ZSCHAU
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Priority to PL11791274T priority Critical patent/PL2649860T3/en
Publication of EP2649860A1 publication Critical patent/EP2649860A1/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
    • H05B3/72—Plates of sheet metal
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/07—Heating plates with temperature control means

Definitions

  • the invention relates to a heating device for a household appliance, wherein the heating device has a substrate to be heated with a use side and a rear side facing away from the use side, at least one surface heating, which is arranged on the back of the substrate, and at least one temperature sensor.
  • the invention also relates to a household appliance with at least one such heating device.
  • the at least one temperature sensor is attached to the surface heating.
  • the at least one temperature sensor is typically used for temperature control of one of the use side directly or spaced facing medium (food, liquor, process air, etc.).
  • characteristic curves are often used to determine a temperature at the use side, which information about an experimentally determined difference between the temperature at the heater of the temperature the usage side depending on one or more variables (eg the temperature at the heater).
  • DE 20 32 151 A1 discloses an electric heater with a flat support body made of inorganic material, such as glass ceramic, fused silica, porcelain, the upper side has at least one heating surface for receiving the material to be heated, wherein the support body is formed as a profiled press or cast body.
  • the support body may have a bedding for receiving a temperature sensor or regulator.
  • GB 2 103 910 A discloses a glass ceramic hotplate in which at least one radiant heater is disposed beneath a glass ceramic cooking surface and wherein the or each radiant heater comprises a continuous base layer of electrically and thermally insulating material, a peripheral wall also of electrically and thermally insulating material, and a heating element disposed on the base layer having.
  • the radiant heater also includes means, for example a backing, on the base layer for insulating a region in the peripheral wall from the heat emitted by the heating element and a temperature sensor such as a thermocouple or a platinum resistor within the isolated region to substantially only in operation the temperature of a cooking vessel, which is heated by the heater, to react sensitively.
  • the temperature sensor is effective because a cold area is created on the glass ceramic plate, by which the temperature of the cooking vessel can be determined.
  • FR 2 283 618 A1 discloses a heater having a low temperature gradient, the device having an electrical resistance protected by an electrically insulating material, the heating resistor having a thin heating conductor sandwiched between two sheets of electrically insulating material.
  • a heating device for a domestic appliance comprising a substrate to be heated with a use side and a rear side facing away from the use side, at least one surface heating, which is arranged on the back of the substrate, and at least one temperature sensor, wherein the at least one temperature sensor an associated recess in the surface heating is performed and fixed to the substrate.
  • the use side may in particular represent that side or surface of the substrate which is intended to be exposed to a medium to be treated (feed, liquor, process air, etc.).
  • the rear side can be shielded in particular by the substrate against the medium to be treated.
  • This heating device has the advantage that a direct influencing of the temperature sensed by the at least one temperature sensor is reduced on account of the surface heating, that is to say a temperature measurement which is relatively independent of the temperature of the heating is made possible. Rather, the temperature at its side of use more accurate and reliable reproducing substrate is sensed. Also, the at least one temperature sensor can now respond more quickly to temperature changes on the use side of the substrate, allowing for improved temperature control.
  • the at least one temperature sensor since the substrate is not broken through the recess, the at least one temperature sensor remains protected from the medium to be treated, which allows a further long service life. Also, the at least one temperature sensor remains hidden when looking at the use side, and the use side is easier to clean.
  • the recessed construction also allows a flatter construction.
  • the long service life is further extended by the fact that a temperature at the substrate due to a heat spread and due to a smoothing of temperature fluctuations of the heater (which may occur, for example, in a pulse-like operation of the heater) lower maximum values and temperature fluctuations than in a direct on the heater attached temperature sensor.
  • the substrate may comprise, for example, metal, including enameled metal, glass or glass-ceramic.
  • the at least one temperature sensor is mounted in a rear recess or depression of the substrate. This further reduces an influence of the heating on a temperature measurement. Also, the at least one temperature sensor is brought even closer to the use side, which further improves, for example, a measurement accuracy and a response time with respect to a temperature change on the use side.
  • the substrate has a plurality of layers or layers and the rear depression is formed by at least one recess in at least one of the layers.
  • the rear depression is formed by at least one recess in at least one of the layers.
  • at least in that layer which forms the use side of the substrate "uppermost layer"
  • no such recess is provided in order to avoid a breakthrough.
  • all layers except for the uppermost layer have a recess for generating the respective depression in order to bring the at least one temperature sensor as close as possible to the use side.
  • the layers may in particular be metal layers, wherein at least one of the layers may in particular comprise stainless steel or aluminum.
  • an uppermost layer forming the use side of the substrate may be made of durable stainless steel while an underlying layer forming the backside of the substrate is made of highly thermally conductive aluminum.
  • the heater is then attached to the aluminum layer.
  • the recess may be e.g. be formed by a recess in the aluminum layer.
  • the at least one temperature sensor can then be attached to a rear side of the stainless steel layer.
  • the layers preferably have at least one independently producible and / or freestanding layer or layer.
  • the recesses in the layers may be introduced after applying or joining the layers, e.g. by etching, lasing, etc. Alternatively, the recesses may be introduced into the respective layers prior to joining the layers and the layers then joined together.
  • the assembly may be used in independently producible layers e.g. done by soldering and / or whipping.
  • the substrate is a homogeneous material and the rear recess is formed by a material removal of the substrate, for example by milling, etching, drilling or lasing.
  • the depression is preferably brought as close as possible to the use side.
  • the recess on an area of max. about 400 mm 2 , in particular to a diameter of about 20 mm, is limited, so that the good heat distribution in the heating is not interrupted.
  • the recess is not limited in shape and may be, for example, angular, round, elliptical or equipped with a freeform contour, etc., with a circular or cylindrical recess is preferred.
  • Attachment of a temperature sensor may be accomplished in any suitable manner, e.g. by means of soldering, welding, clamping, press-fitting, gluing etc.
  • the heater may in particular be a thin-film heater or a thick-film heater.
  • the heater may comprise an electrically conductive heating conductor layer.
  • the heating conductor layer may be applied directly to a substrate to be heated, in particular if the substrate is an electrically non-conductive substrate, e.g. made of glass, glass ceramic or plastic.
  • the heating conductor layer may alternatively be applied indirectly over an electrically insulating insulating layer on a substrate to be heated, in particular if the substrate is an electrically conductive substrate, e.g. made of metal.
  • the heat conductor layer may in particular consist of CrNi.
  • a thickness of the heating conductor layer between one and 300 micrometers, in particular between 25 and 50 micrometers, is preferred.
  • the insulating layer preferably comprises a dielectric material, preferably aluminum oxide.
  • a thickness of the insulating layer between 150 and 500 micrometers, in particular between 250 and 300 micrometers, is preferred.
  • top coat may have been applied to the heater, which may for example prevent moisture from penetrating into the hygroscopic insulating layer.
  • the at least one heating track has been applied by means of a plasma process.
  • a use of a thermal plasma spraying is advantageous.
  • the heating conductor layer and optionally the insulating layer can be applied to the substrate.
  • a plasma torch can be used for plasma spraying.
  • the plasma spraying has the advantage that it is easy to carry out and allows a high accuracy of the produced layers.
  • many materials can be plasma sprayed.
  • the substrate hardly heats up during the coating (up to a maximum of 200 ° C.), which is likewise advantageous.
  • the object is also achieved by a household appliance with at least one heating device as described above.
  • the household appliance may in particular be a cooking appliance. It is an embodiment that the household appliance is a cooking appliance in the form of a Garraumeinschubs.
  • the cooking compartment insert can in particular be a food support, e.g. an actively heated baking sheet, food tray or cooking space divider.
  • the use side is typically also serving as a food storage top, his ceiling or top is directly heated by means of the rear mounted heater.
  • the temperature measurement can be so accurate that a temperature at an underside of a resting food can also be determined. Even later additions of cold foods, liquids, etc. (for example, fish sticks or infusions) may then be detected by the at least one temperature sensor.
  • a temperature control can be used advantageously to prevent burning and burning (empty cooking protection).
  • the household appliance may also be another cooking appliance, e.g. an oven (oven, microwave oven etc.) or a hob.
  • the substrate of the hob can e.g. be a glass ceramic plate.
  • the medium to be heated can then be in particular a cookware (pot, pan, etc.).
  • the household appliance may also include, for example, a washing machine (e.g., with the heating device for heating liquor), a tumble dryer (e.g., with the heating device for heating process air), or a dishwasher (e.g., with the heating device for heating rinse water).
  • a washing machine e.g., with the heating device for heating liquor
  • a tumble dryer e.g., with the heating device for heating process air
  • a dishwasher e.g., with the heating device for heating rinse water.
  • the figure shows a heating device 1 for a domestic appliance H, e.g. a heated food support.
  • the heating device 1 has a substrate 2 to be heated with a use side 3 and a rear side 4 facing away from the use side 3.
  • a surface heating 5 is mounted flat.
  • the heating device 1 further has two temperature sensors 6, which are performed by a respectively associated recess 7 in the surface heating 5 and fixed to the substrate 2.
  • the substrate 2 comprises a plurality of sheets or layers 2a, 2b, of which a first or uppermost substrate layer 2a of stainless steel defines the use side 3.
  • a second substrate layer 2 b consists of highly conductive aluminum and supports the surface heating 5.
  • the surface heating 5 has an electrically insulating insulating layer 5a made of aluminum oxide lying flat on the second substrate layer 2b, on which facing away from the second substrate layer 2b, a heat conductor layer 5b is applied flat.
  • the Schuleiter Anlagen 5b can be energized to generate heat.
  • the recess 7 is achieved by corresponding congruent recesses in the insulating layer 5a and the heating conductor layer 5b.
  • the substrate 2 has two rear recesses 8.
  • the recesses 8 are formed by a respective recess in the second substrate layer 2b, so that the temperature sensors 6 are inserted into a respective recess 7 and congruent recess 8 and fixed to the back of the uppermost substrate layer 2a.
  • the temperature sensors 6 may be attached to the uppermost substrate layer 2a directly or via a thermal interface material (TIM), such as a thermal interface material.
  • TIM thermal interface material
  • the recess 7 and the recess 8 are each configured in a circular plan view with a diameter of not more than about 20 mm.
  • the temperature sensors 6 are connected via corresponding electrical lines 9 to an evaluation unit, in particular a control unit.
  • the control unit may, in the case of a food support as the household appliance H, for. be a control unit of the Gargut lacking receiving cooking appliance.

Description

Die Erfindung betrifft eine Heizvorrichtung für ein Haushaltsgerät, wobei die Heizvorrichtung ein zu erwärmendes Substrat mit einer Gebrauchsseite und einer der Gebrauchsseite abgewandten Rückseite, mindestens eine Flächenheizung, welche an der Rückseite des Substrats angeordnet ist, und mindestens einen Temperatursensor aufweist. Die Erfindung betrifft auch ein Haushaltsgerät mit mindestens einer solchen Heizvorrichtung.The invention relates to a heating device for a household appliance, wherein the heating device has a substrate to be heated with a use side and a rear side facing away from the use side, at least one surface heating, which is arranged on the back of the substrate, and at least one temperature sensor. The invention also relates to a household appliance with at least one such heating device.

Es sind Heizvorrichtungen für Haushaltsgeräte nach Art des Oberbegriffs bekannt, bei denen der mindestens eine Temperatursensor an der Flächenheizung befestigt ist. Der mindestens eine Temperatursensor wird typischerweise für eine Temperaturregelung eines der Gebrauchsseite direkt oder beabstandet zugewandten Mediums (Speise, Lauge, Prozessluft usw.) verwendet. Da sich jedoch eine Temperatur an der Heizung von einer Temperatur an der Gebrauchsseite zum Teil erheblich unterscheiden kann, werden für eine Ermittlung einer Temperatur an der Gebrauchsseite häufig Kennlinien verwendet, welche Informationen über einen experimentell bestimmten Unterschied zwischen der Temperatur an der Heizung von der Temperatur an der Gebrauchsseite in Abhängigkeit einer oder mehrerer Variablen (z.B. der Temperatur an der Heizung) abbilden.There are known heaters for household appliances in the manner of the preamble, in which the at least one temperature sensor is attached to the surface heating. The at least one temperature sensor is typically used for temperature control of one of the use side directly or spaced facing medium (food, liquor, process air, etc.). However, since a temperature at the heater may differ considerably from a temperature at the usage side, characteristic curves are often used to determine a temperature at the use side, which information about an experimentally determined difference between the temperature at the heater of the temperature the usage side depending on one or more variables (eg the temperature at the heater).

DE 20 32 151 A1 offenbart eine elektrische Heizeinrichtung mit einem flächigen Tragkörper aus anorganischem Werkstoff, wie z.B. Glaskeramik, Quarzgut, Porzellan, dessen Oberseite mindestens eine Heizfläche zur Aufnahme des zu beheizenden Gutes aufweist, wobei der Tragkörper als profilierter Press- oder Gusskörper ausgebildet ist. Der Tragkörper kann eine Bettung zur Aufnahme eines Temperaturfühlers oder -reglers aufweisen. DE 20 32 151 A1 discloses an electric heater with a flat support body made of inorganic material, such as glass ceramic, fused silica, porcelain, the upper side has at least one heating surface for receiving the material to be heated, wherein the support body is formed as a profiled press or cast body. The support body may have a bedding for receiving a temperature sensor or regulator.

GB 2 103 910 A offenbart eine Glaskeramik-Kochplatte, bei der wenigstens eine Strahlungsheizung unterhalb einer Glaskeramik-Kochfläche angeordnet ist und wobei die oder jede Strahlungsheizung eine kontinuierliche Grundschicht aus elektrisch und thermisch isolierendem Material, eine Umfangswand ebenfalls aus elektrisch und thermisch isolierenden Material und ein an der Grundschicht angeordnetes Heizelement aufweist. Der Strahlungsheizkörper umfasst auch Mittel, beispielsweise eine Unterlage, auf der Basisschicht zum Isolieren eines Bereichs in der Umfangswand von der von dem Heizelement emittierten Wärme und einen Temperaturfühler wie ein Thermoelement oder einen Platin-Widerstand innerhalb des isolierten Bereichs, um im Betrieb im Wesentlichen nur auf die Temperatur eines Kochgefäßes, das durch die Heizvorrichtung erwärmt wird, empfindlich zu reagieren. Der Temperatursensor ist effektiv, weil auf der Glaskeramikplatte ein kalter Bereich erzeugt wird, durch den die Temperatur des Kochgefäßes bestimmt werden kann. GB 2 103 910 A discloses a glass ceramic hotplate in which at least one radiant heater is disposed beneath a glass ceramic cooking surface and wherein the or each radiant heater comprises a continuous base layer of electrically and thermally insulating material, a peripheral wall also of electrically and thermally insulating material, and a heating element disposed on the base layer having. The radiant heater also includes means, for example a backing, on the base layer for insulating a region in the peripheral wall from the heat emitted by the heating element and a temperature sensor such as a thermocouple or a platinum resistor within the isolated region to substantially only in operation the temperature of a cooking vessel, which is heated by the heater, to react sensitively. The temperature sensor is effective because a cold area is created on the glass ceramic plate, by which the temperature of the cooking vessel can be determined.

FR 2 283 618 A1 offenbart eine Heizvorrichtung mit einem geringen Temperaturgradienten, wobei die Vorrichtung einen elektrischen Widerstand aufweist, welcher von einem elektrisch isolierenden Material geschützt ist, wobei der Heizwiderstand einen dünnen Heizleiter aufweist, der zwischen zwei Folien aus elektrisch isolierendem Material sandwichartig eingebracht ist. FR 2 283 618 A1 discloses a heater having a low temperature gradient, the device having an electrical resistance protected by an electrically insulating material, the heating resistor having a thin heating conductor sandwiched between two sheets of electrically insulating material.

Es ist die Aufgabe der vorliegenden Erfindung, eine einfacher umzusetzende, robuste und genauer messende Heizvorrichtung für Haushaltsgeräte bereitzustellen.It is the object of the present invention to provide a simpler to implement, robust and accurate measuring heater for household appliances.

Diese Aufgabe wird gemäß den Merkmalen der unabhängigen Ansprüche gelöst. Bevorzugte Ausführungsformen sind insbesondere den abhängigen Ansprüchen entnehmbar.This object is achieved according to the features of the independent claims. Preferred embodiments are in particular the dependent claims.

Die Aufgabe wird gelöst durch eine Heizvorrichtung für ein Haushaltsgerät, aufweisend ein zu erwärmendes Substrat mit einer Gebrauchsseite und einer der Gebrauchsseite abgewandten Rückseite, mindestens eine Flächenheizung, welche an der Rückseite des Substrats angeordnet ist, und mindestens einen Temperatursensor, wobei der mindestens eine Temperatursensor durch eine zugehörige Aussparung in der Flächenheizung durchgeführt und an dem Substrat befestigt ist.The object is achieved by a heating device for a domestic appliance, comprising a substrate to be heated with a use side and a rear side facing away from the use side, at least one surface heating, which is arranged on the back of the substrate, and at least one temperature sensor, wherein the at least one temperature sensor an associated recess in the surface heating is performed and fixed to the substrate.

Die Gebrauchsseite kann insbesondere diejenige Seite oder Oberfläche des Substrats darstellen, welche dazu vorgesehen ist, einem zu behandelnden Medium (Speise, Lauge, Prozessluft usw.) ausgesetzt zu sein. Die Rückseite kann insbesondere durch das Substrat gegen das zu behandelnde Medium abgeschirmt sein.The use side may in particular represent that side or surface of the substrate which is intended to be exposed to a medium to be treated (feed, liquor, process air, etc.). The rear side can be shielded in particular by the substrate against the medium to be treated.

Diese Heizvorrichtung weist den Vorteil auf, dass eine direkte Beeinflussung der durch den mindestens einen Temperatursensor abgefühlten Temperatur aufgrund der Flächenheizung verringert wird, also eine von der Temperatur der Heizung relativ unabhängige Temperaturmessung ermöglicht wird. Vielmehr wird das eine Temperatur an seiner Gebrauchsseite genauer und zuverlässiger wiedergebende Substrat abgefühlt. Auch kann der mindestens eine Temperatursensor nun schneller auf Temperaturänderungen an der Gebrauchseite des Substrats ansprechen, was eine verbesserte Temperaturregelung ermöglicht.This heating device has the advantage that a direct influencing of the temperature sensed by the at least one temperature sensor is reduced on account of the surface heating, that is to say a temperature measurement which is relatively independent of the temperature of the heating is made possible. Rather, the temperature at its side of use more accurate and reliable reproducing substrate is sensed. Also, the at least one temperature sensor can now respond more quickly to temperature changes on the use side of the substrate, allowing for improved temperature control.

Da das Substrat durch die Vertiefung nicht durchbrochen wird, bleibt ferner der mindestens eine Temperatursensor vor dem zu behandelnden Medium geschützt, was eine weiterhin hohe Lebensdauer ermöglicht. Auch bleibt so der mindestens eine Temperatursensor bei einem Blick auf die Gebrauchsseite verborgen, und die Gebrauchsseite ist einfacher reinigbar. Die versenkte Bauweise erlaubt außerdem einen flacheren Aufbau. Die hohe Lebensdauer wird zudem noch dadurch verlängert, dass eine Temperatur an dem Substrat aufgrund einer Wärmespreizung und aufgrund einer Glättung von Temperaturschwankungen der Heizung (welche z.B. bei einem pulsartigen Betrieb der Heizung auftreten können) geringere Maximalwerte und Temperaturschwankungen aufweist als bei einem direkt an der Heizung befestigten Temperatursensor.Furthermore, since the substrate is not broken through the recess, the at least one temperature sensor remains protected from the medium to be treated, which allows a further long service life. Also, the at least one temperature sensor remains hidden when looking at the use side, and the use side is easier to clean. The recessed construction also allows a flatter construction. The long service life is further extended by the fact that a temperature at the substrate due to a heat spread and due to a smoothing of temperature fluctuations of the heater (which may occur, for example, in a pulse-like operation of the heater) lower maximum values and temperature fluctuations than in a direct on the heater attached temperature sensor.

Das Substrat kann beispielsweise Metall, einschließlich emailliertes Metall, Glas oder Glaskeramik umfassen.The substrate may comprise, for example, metal, including enameled metal, glass or glass-ceramic.

Erfindungsgemäß ist der mindestens eine Temperatursensor in einer rückwärtigen Ausnehmung oder Vertiefung des Substrats befestigt. Dadurch wird ein Einfluss der Heizung auf eine Temperaturmessung noch weiter verringert. Auch wird so der mindestens eine Temperatursensor noch näher an die Gebrauchsseite herangeführt, was beispielsweise eine Messgenauigkeit und eine Ansprechzeit bezüglich einer Temperaturänderung an der Gebrauchsseite weiter verbessert.According to the invention, the at least one temperature sensor is mounted in a rear recess or depression of the substrate. This further reduces an influence of the heating on a temperature measurement. Also, the at least one temperature sensor is brought even closer to the use side, which further improves, for example, a measurement accuracy and a response time with respect to a temperature change on the use side.

Es ist beispielsweise eine zur besseren Wärmeverteilung und/oder für eine erhöhte Stabilität bevorzugte Ausgestaltung, dass das Substrat mehrere Lagen oder Schichten aufweist und die rückwärtige Vertiefung durch mindestens eine Aussparung in mindestens einer der Schichten gebildet ist. Dabei ist zumindest in derjenigen Schicht, welche die Gebrauchsseite des Substrats bildet ("oberste Schicht"), keine solche Aussparung vorgesehen, um einen Durchbruch zu vermeiden. Es ist eine Weiterbildung, dass sämtliche Schichten bis auf die oberste Schicht eine Aussparung zur Erzeugung der jeweiligen Vertiefung aufweisen, um den mindestens einen Temperatursensor möglichst nahe an die Gebrauchsseite heranzubringen.It is, for example, a preferred embodiment for better heat distribution and / or for increased stability that the substrate has a plurality of layers or layers and the rear depression is formed by at least one recess in at least one of the layers. In this case, at least in that layer which forms the use side of the substrate ("uppermost layer"), no such recess is provided in order to avoid a breakthrough. It is a development that all layers except for the uppermost layer have a recess for generating the respective depression in order to bring the at least one temperature sensor as close as possible to the use side.

Die Schichten können insbesondere Metallschichten sein, wobei zumindest eine der Schichten insbesondere Edelstahl oder Aluminium aufweisen kann. Beispielsweise kann eine oberste Schicht, welche die Gebrauchsseite des Substrats bildet, aus beständigem Edelstahl bestehen, während eine darunterliegende Schicht, welche die Rückseite des Substrats bildet, aus hochgradig wärmeleitendem Aluminium besteht. Die Heizung ist dann an der Aluminiumschicht angebracht. In diesem Fall kann die Vertiefung z.B. durch eine Aussparung in der Aluminiumschicht gebildet sein. Der mindestens eine Temperatursensor kann dann an einer Rückseite der Edelstahlschicht angebracht sein.The layers may in particular be metal layers, wherein at least one of the layers may in particular comprise stainless steel or aluminum. For example, an uppermost layer forming the use side of the substrate may be made of durable stainless steel while an underlying layer forming the backside of the substrate is made of highly thermally conductive aluminum. The heater is then attached to the aluminum layer. In this case, the recess may be e.g. be formed by a recess in the aluminum layer. The at least one temperature sensor can then be attached to a rear side of the stainless steel layer.

Die Schichten weisen vorzugsweise mindestens eine eigenständig erzeugbare und/oder freistehende Lage oder Schicht auf.The layers preferably have at least one independently producible and / or freestanding layer or layer.

Die Aussparungen in den Schichten können nach einem Aufbringen oder Zusammenfügen der Schichten eingebracht werden, z.B. durch Ätzen, Lasern usw. Alternativ können die Aussparungen in die entsprechenden Schichten vor einem Zusammenfügen der Schichten eingebracht werden und die Schichten dann zusammengefügt werden. Das Zusammenfügen kann bei eigenständig erzeugbaren Schichten z.B. durch Löten und/oder Aufschlagen erfolgen.The recesses in the layers may be introduced after applying or joining the layers, e.g. by etching, lasing, etc. Alternatively, the recesses may be introduced into the respective layers prior to joining the layers and the layers then joined together. The assembly may be used in independently producible layers e.g. done by soldering and / or whipping.

Es ist eine alternative Ausgestaltung, dass das Substrat ein homogenes Material ist und die rückwärtige Vertiefung durch eine Materialabtragung des Substrats gebildet ist, beispielsweise durch Fräsen, Ätzen, Bohren oder Lasern. Die Vertiefung ist vorzugsweise möglichst nahe an die Gebrauchsseite herangebracht.It is an alternative embodiment that the substrate is a homogeneous material and the rear recess is formed by a material removal of the substrate, for example by milling, etching, drilling or lasing. The depression is preferably brought as close as possible to the use side.

Es ist noch eine Ausgestaltung, dass die Aussparung auf eine Fläche von max. ca. 400 mm2, insbesondere auf einen Durchmesser von ca. 20 mm, begrenzt ist, damit die gute Wärmeverteilung im Bereich der Heizung nicht unterbrochen wird.It is still an embodiment that the recess on an area of max. about 400 mm 2 , in particular to a diameter of about 20 mm, is limited, so that the good heat distribution in the heating is not interrupted.

Die Vertiefung ist in ihrer Form nicht beschränkt und kann beispielsweise eckig, rund, elliptisch oder mit einer Freiformkontur ausgestattet usw. sein, wobei eine kreisförmige oder zylinderförmige Vertiefung bevorzugt wird.The recess is not limited in shape and may be, for example, angular, round, elliptical or equipped with a freeform contour, etc., with a circular or cylindrical recess is preferred.

Eine Befestigung eines Temperatursensors kann auf jede geeignete Weise erfolgen, z.B. mittels Lötens, Schweißens, Verklemmens, Einpressens, Klebens usw.Attachment of a temperature sensor may be accomplished in any suitable manner, e.g. by means of soldering, welding, clamping, press-fitting, gluing etc.

Die Heizung kann insbesondere eine Dünnschichtheizung oder eine Dickschichtheizung sein.The heater may in particular be a thin-film heater or a thick-film heater.

Die Heizung kann eine elektrisch leitfähige Heizleiterschicht aufweisen. Die Heizleiterschicht kann direkt auf einem zu heizenden Substrat aufgebracht sein, insbesondere falls das Substrat ein elektrisch nichtleitendes Substrat ist, z.B. aus Glas, Glaskeramik oder Kunststoff. Die Heizleiterschicht kann alternativ indirekt über eine elektrisch isolierende Isolierungsschicht auf einem zu heizenden Substrat aufgebracht sein, insbesondere falls das Substrat ein elektrisch leitendes Substrat ist, z.B. aus Metall.The heater may comprise an electrically conductive heating conductor layer. The heating conductor layer may be applied directly to a substrate to be heated, in particular if the substrate is an electrically non-conductive substrate, e.g. made of glass, glass ceramic or plastic. The heating conductor layer may alternatively be applied indirectly over an electrically insulating insulating layer on a substrate to be heated, in particular if the substrate is an electrically conductive substrate, e.g. made of metal.

Die Heizleiterschicht kann insbesondere aus CrNi bestehen. Dabei wird eine Dicke der Heizleiterschicht zwischen einem und 300 Mikrometern, insbesondere zwischen 25 und 50 Mikrometern, bevorzugt.The heat conductor layer may in particular consist of CrNi. In this case, a thickness of the heating conductor layer between one and 300 micrometers, in particular between 25 and 50 micrometers, is preferred.

Die Isolierungsschicht weist vorzugsweise ein dielektrisches Material, bevorzugt Aluminiumoxid, auf. Es wird eine Dicke der Isolierungsschicht zwischen 150 und 500 Mikrometern, insbesondere zwischen 250 und 300 Mikrometern, bevorzugt.The insulating layer preferably comprises a dielectric material, preferably aluminum oxide. A thickness of the insulating layer between 150 and 500 micrometers, in particular between 250 and 300 micrometers, is preferred.

Zudem kann beispielsweise noch eine Schutzschicht ("Top Coat") auf die Heizung aufgebracht worden sein, welche z.B. verhindern kann, dass Feuchtigkeit in die hygroskopische Isolierschicht eindringt.In addition, for example, a protective layer ("top coat") may have been applied to the heater, which may for example prevent moisture from penetrating into the hygroscopic insulating layer.

Zur elektrischen Kontaktierung können, z.B. mittels einer Schablone, z.B. Bronzeflächen aufgespritzt werden, welche die Heizleiterschicht kontaktieren und an welche elektrische Leitungen angebracht, z.B. angeschweißt, werden können.For electrical contacting, e.g. by means of a template, e.g. Bronze surfaces are applied, which contact the Heizleiterschicht and attached to which electrical lines, e.g. welded, can be.

Es ist noch eine Weiterbildung, dass die mindestens eine Heizbahn mittels eines Plasmaverfahrens aufgebracht worden ist. Dabei ist insbesondere eine Verwendung eines thermischen Plasmaspritzens vorteilhaft.It is still a development that the at least one heating track has been applied by means of a plasma process. In particular, a use of a thermal plasma spraying is advantageous.

Mittels des Plasmaspritzens können die Heizleiterschicht und ggf. die Isolierungsschicht auf das Substrat aufgebracht werden. Zum Plasmaspritzen kann beispielsweise ein Plasmabrenner verwendet werden. Das Plasmaspritzen weist den Vorteil auf, dass es einfach durchführbar ist und eine hohe Genauigkeit der erzeugten Lagen ermöglicht. Zudem können vielerlei Materialien plasmagespritzt werden. Das Substrat erwärmt sich bei der Beschichtung kaum (bis maximal 200°C), was ebenfalls vorteilhaft ist.By means of the plasma spraying, the heating conductor layer and optionally the insulating layer can be applied to the substrate. For example, a plasma torch can be used for plasma spraying. The plasma spraying has the advantage that it is easy to carry out and allows a high accuracy of the produced layers. In addition, many materials can be plasma sprayed. The substrate hardly heats up during the coating (up to a maximum of 200 ° C.), which is likewise advantageous.

Die Aufgabe wird auch gelöst durch ein Haushaltsgerät mit mindestens einer Heizvorrichtung wie oben beschrieben.The object is also achieved by a household appliance with at least one heating device as described above.

Das Haushaltsgerät kann insbesondere ein Gargerät sein. Es ist eine Ausgestaltung, dass das Haushaltsgerät ein Gargerät in Form eines Garraumeinschubs ist. Der Garraumeinschub kann insbesondere ein Gargutträger sein, z.B. ein aktiv beheizbares Backblech, Gargutschale oder Garraumteiler.The household appliance may in particular be a cooking appliance. It is an embodiment that the household appliance is a cooking appliance in the form of a Garraumeinschubs. The cooking compartment insert can in particular be a food support, e.g. an actively heated baking sheet, food tray or cooking space divider.

Insbesondere für den Fall eines Gargutträgers, dessen Gebrauchsseite typischerweise eine auch als Gargutablage dienende Oberseite ist, ist seine Decke oder Oberseite mittels der rückwärtig angebrachten Heizung direkt beheizbar.In particular, in the case of a food support, the use side is typically also serving as a food storage top, his ceiling or top is directly heated by means of the rear mounted heater.

Durch das nahe Heranbringen des mindestens einen Temperatursensors an die Oberseite des Gargutträgers, insbesondere mittels der Vertiefung(en), kann die Temperaturmessung so genau sein, dass auch eine Temperatur an einer Unterseite eines aufliegenden Garguts bestimmt werden kann. Sogar spätere Zugaben von kalten Speisen, Flüssigkeiten usw. (beispielsweise von Fischstäbchen oder Aufgüssen) können dann durch den mindestens einen Temperatursensor erkannt werden. Dadurch besteht die Möglichkeit, eine schnell ansprechende Temperaturregelung zu realisieren. Eine solche Temperaturregelung kann vorteilhafterweise dazu genutzt werden, ein Anbrennen und Verbrennen zu verhindern (Leerkochschutz). Zudem ergeben sich so zusätzliche Möglichkeiten einer Gestaltung von Garprogrammen. Ferner wird eine Zubereitung von besonders empfindlichen Lebensmitteln erleichtert. Auch ein gelingsicheres Kochen für Anfänger kann so vereinfacht werden.By bringing the at least one temperature sensor close to the top of the food support, in particular by means of the depression (s), the temperature measurement can be so accurate that a temperature at an underside of a resting food can also be determined. Even later additions of cold foods, liquids, etc. (for example, fish sticks or infusions) may then be detected by the at least one temperature sensor. This makes it possible to realize a fast-response temperature control. Such a temperature control can be used advantageously to prevent burning and burning (empty cooking protection). In addition, there are additional possibilities for designing cooking programs. Furthermore, a preparation of particularly sensitive foods is facilitated. Even a successful cooking for beginners can be simplified.

Jedoch kann das Haushaltsgerät auch ein anderes Gargerät sein, z.B. ein Ofen (Backofen, Mikrowellenofen usw.) oder ein Kochfeld. Das Substrat des Kochfelds kann z.B. eine Glaskeramikplatte sein. Das zu beheizende Medium kann dann insbesondere ein Kochgeschirr (Topf, Pfanne usw.) sein.However, the household appliance may also be another cooking appliance, e.g. an oven (oven, microwave oven etc.) or a hob. The substrate of the hob can e.g. be a glass ceramic plate. The medium to be heated can then be in particular a cookware (pot, pan, etc.).

Das Haushaltsgerät kann jedoch beispielsweise auch eine Waschmaschine (z.B. mit der Heizvorrichtung zum Erwärmen von Lauge), Wäschetrockner (z.B. mit der Heizvorrichtung zum Erwärmen von Prozessluft) oder eine Spülmaschine (z.B. mit der Heizvorrichtung zum Erwärmen von Spülwasser) umfassen.However, the household appliance may also include, for example, a washing machine (e.g., with the heating device for heating liquor), a tumble dryer (e.g., with the heating device for heating process air), or a dishwasher (e.g., with the heating device for heating rinse water).

In der folgenden Figur wird die Erfindung anhand eines Ausführungsbeispiels schematisch genauer beschrieben.In the following figure, the invention will be described schematically with reference to an embodiment schematically.

Die Fig. zeigt eine Heizvorrichtung 1 für ein Haushaltsgerät H, z.B. einen beheizbaren Gargutträger. Die Heizvorrichtung 1 weist ein zu erwärmendes Substrat 2 mit einer Gebrauchsseite 3 und einer der Gebrauchsseite 3 abgewandten Rückseite 4 auf. An der Rückseite 4 des Substrats 2 ist eine Flächenheizung 5 flächig angebracht. Die Heizvorrichtung 1 weist ferner zwei Temperatursensoren 6 auf, welche durch eine jeweils zugehörige Aussparung 7 in der Flächenheizung 5 durchgeführt und an dem Substrat 2 befestigt sind.The figure shows a heating device 1 for a domestic appliance H, e.g. a heated food support. The heating device 1 has a substrate 2 to be heated with a use side 3 and a rear side 4 facing away from the use side 3. On the back 4 of the substrate 2, a surface heating 5 is mounted flat. The heating device 1 further has two temperature sensors 6, which are performed by a respectively associated recess 7 in the surface heating 5 and fixed to the substrate 2.

Genauer gesagt weist das Substrat 2 mehrere Lagen oder Schichten 2a, 2b auf, von denen eine erste oder oberste Substratschicht 2a aus Edelstahl die Gebrauchsseite 3 definiert. Eine zweite Substratschicht 2b besteht aus gut leitendem Aluminium und trägt die Flächenheizung 5.More specifically, the substrate 2 comprises a plurality of sheets or layers 2a, 2b, of which a first or uppermost substrate layer 2a of stainless steel defines the use side 3. A second substrate layer 2 b consists of highly conductive aluminum and supports the surface heating 5.

Die Flächenheizung 5 wiederum weist eine auf der zweiten Substratschicht 2b flächig aufliegende, elektrisch isolierende Isolierungsschicht 5a aus Aluminiumoxid auf, auf welcher, von der zweiten Substratschicht 2b abgewandt, eine Heizleiterschicht 5b flächig aufgebracht ist. Die Heizleiterschicht 5b ist zur Wärmeerzeugung bestrombar. Die Aussparung 7 wird durch entsprechende deckungsgleiche Aussparungen in der Isolierungsschicht 5a und der Heizleiterschicht 5b erreicht.The surface heating 5, in turn, has an electrically insulating insulating layer 5a made of aluminum oxide lying flat on the second substrate layer 2b, on which facing away from the second substrate layer 2b, a heat conductor layer 5b is applied flat. The Heizleiterschicht 5b can be energized to generate heat. The recess 7 is achieved by corresponding congruent recesses in the insulating layer 5a and the heating conductor layer 5b.

Für eine verbesserte thermische Abschirmung von der Flächenheizung 5 und für eine besonders nahe Heranführung der Temperatursensoren 6 an die Gebrauchsseite 3 weist das Substrat 2 zwei rückwärtige Vertiefungen 8 auf. Die Vertiefungen 8 werden durch eine jeweilige Aussparung in der zweiten Substratschicht 2b gebildet, so dass die Temperatursensoren 6 in eine jeweilige Aussparung 7 und deckungsgleiche Vertiefung 8 eingeführt und an der Rückseite der obersten Substratschicht 2a befestigt sind. Die Temperatursensoren 6 können unmittelbar oder über ein thermisches Schnittstellenmaterial (TIM; "Thermal Interface Material") wie eine Wärmeleitpaste an der obersten Substratschicht 2a befestigt sein. Die Aussparung 7 und die Vertiefung 8 sind in Draufsicht jeweils kreisförmig mit einem Durchmesser von nicht mehr als ca. 20 mm ausgestaltet. Die Temperatursensoren 6 sind über entsprechende elektrische Leitungen 9 mit einer Auswerteeinheit, insbesondere einer Steuereinheit, verbunden. Die Steuereinheit kann im Falle eines Gargutträgers als dem Haushaltsgerät H z.B. eine Steuereinheit eines den Gargutträger aufnehmenden Gargeräts sein.For an improved thermal shielding of the surface heating 5 and for a particularly close approach of the temperature sensors 6 to the use side 3, the substrate 2 has two rear recesses 8. The recesses 8 are formed by a respective recess in the second substrate layer 2b, so that the temperature sensors 6 are inserted into a respective recess 7 and congruent recess 8 and fixed to the back of the uppermost substrate layer 2a. The temperature sensors 6 may be attached to the uppermost substrate layer 2a directly or via a thermal interface material (TIM), such as a thermal interface material. The recess 7 and the recess 8 are each configured in a circular plan view with a diameter of not more than about 20 mm. The temperature sensors 6 are connected via corresponding electrical lines 9 to an evaluation unit, in particular a control unit. The control unit may, in the case of a food support as the household appliance H, for. be a control unit of the Gargutträger receiving cooking appliance.

Selbstverständlich ist die vorliegende Erfindung nicht auf die gezeigten Ausführungsbeispiele beschränkt.Of course, the present invention is not limited to the embodiments shown.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Heizvorrichtungheater
22
Substratsubstratum
2a2a
erste Substratschichtfirst substrate layer
2b2 B
zweite Substratschichtsecond substrate layer
33
Gebrauchsseiteuse page
44
Rückseiteback
55
Flächenheizungpanel heating
5a5a
Isolierungsschichtinsulation layer
5b5b
Heizleiterschichtheat conductor
66
Temperatursensortemperature sensor
77
Aussparungrecess
88th
Vertiefungdeepening
99
elektrische Leitungelectrical line
HH
Haushaltsgeräthousehold appliance

Claims (8)

  1. Heating device (1) for a domestic appliance (H), having
    - a substrate (2) to be heated with a usage side (3) and a rear side (4) facing away from the usage side (3),
    - at least one surface heater (5), which is arranged on the rear side (4) of the substrate (2), and
    - at least one temperature sensor (6),
    characterised in that
    the at least one temperature sensor (6) is guided through an associated recess (7) in the surface heater (5) and fastened in a rear depression (8) of the substrate (2).
  2. Heating device (1) according to claim 1, characterised in that the substrate (2) has a plurality of layers (2a; 2b) and the rear depression (8) is formed by a recess (7) in at least one of the layers (2b), wherein there is no such recess (7) at least in that layer (2a) which forms the usage side (3) of the substrate (2).
  3. Heating device according to claim 2, characterised in that that layer (2a) which forms the usage side (3) of the substrate (2) consists of stainless steel and an underlying layer (2b) which forms the rear side (4) of the substrate (2) consists of aluminium.
  4. Heating device according to claim 2, characterised in that the substrate is a homogenous material and the rear depression is formed by a removal of material from the substrate.
  5. Heating device (1) according to one of the preceding claims, characterised in that the recess (7) is limited to an area of approx. 400 mm2, in particular to a diameter of approx. 20 mm.
  6. Domestic appliance (H) with at least one heating device (1), characterised in that the heating device (1) is a heating device (1) according to one of the preceding claims.
  7. Domestic appliance (H) according to claim 6, characterised in that the domestic appliance (H) is a cooking appliance.
  8. Domestic appliance (H) according to claim 6, characterised in that the domestic appliance (H) is a cooking chamber insert.
EP11791274.1A 2010-12-07 2011-12-01 Heating device for a household appliance and household appliance comprising such a heating device Active EP2649860B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL11791274T PL2649860T3 (en) 2010-12-07 2011-12-01 Heating device for a household appliance and household appliance comprising such a heating device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010062507A DE102010062507A1 (en) 2010-12-07 2010-12-07 Heating device for a household appliance and household appliance with such a heating device
PCT/EP2011/071486 WO2012076392A1 (en) 2010-12-07 2011-12-01 Heating device for a household appliance and household appliance comprising such a heating device

Publications (2)

Publication Number Publication Date
EP2649860A1 EP2649860A1 (en) 2013-10-16
EP2649860B1 true EP2649860B1 (en) 2017-08-16

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EP11791274.1A Active EP2649860B1 (en) 2010-12-07 2011-12-01 Heating device for a household appliance and household appliance comprising such a heating device

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EP (1) EP2649860B1 (en)
DE (1) DE102010062507A1 (en)
ES (1) ES2645369T3 (en)
PL (1) PL2649860T3 (en)
WO (1) WO2012076392A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2942694A1 (en) 2014-03-14 2015-09-17 Spectrum Brands, Inc. Wirelessly operable cooking appliance

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2032151A1 (en) * 1970-06-30 1972-01-05 Siemens Elektrogeraete Gmbh Electrical heating device with a flat support body made of inorganic material
FR2283618A1 (en) * 1974-09-02 1976-03-26 Jamet Michel Electric heating device for liquid tank - has conductive film heating element between two insulating sheets
GB2103910B (en) * 1981-08-08 1985-08-21 Micropore International Ltd Improvements in electric cookers incorporating radiant heaters

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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Also Published As

Publication number Publication date
ES2645369T3 (en) 2017-12-05
PL2649860T3 (en) 2017-12-29
EP2649860A1 (en) 2013-10-16
WO2012076392A1 (en) 2012-06-14
DE102010062507A1 (en) 2012-06-14

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