EP0230555B1 - Heating element of a cooking appliance - Google Patents

Heating element of a cooking appliance Download PDF

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Publication number
EP0230555B1
EP0230555B1 EP19860116385 EP86116385A EP0230555B1 EP 0230555 B1 EP0230555 B1 EP 0230555B1 EP 19860116385 EP19860116385 EP 19860116385 EP 86116385 A EP86116385 A EP 86116385A EP 0230555 B1 EP0230555 B1 EP 0230555B1
Authority
EP
European Patent Office
Prior art keywords
heating
heating element
zones
cooking position
element according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19860116385
Other languages
German (de)
French (fr)
Other versions
EP0230555A3 (en
EP0230555A2 (en
Inventor
Julius Dipl.-Ing. Husslein
Günther Wittauer
Heinz Kotsch
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.)
BOSCH-SIEMENS HAUSGERAETE GMBH
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Individual
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Filing date
Publication date
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Publication of EP0230555A2 publication Critical patent/EP0230555A2/en
Publication of EP0230555A3 publication Critical patent/EP0230555A3/en
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Publication of EP0230555B1 publication Critical patent/EP0230555B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/72—Plates of sheet metal

Definitions

  • the invention relates to a hotplate heating element according to the preamble of claim 1.
  • a known electrical heating device in a known electrical heating device according to US-A-1 636 029, cell-like cavities, delimited by ribs, are provided on the underside of a metallic hotplate body, in which heating elements are arranged.
  • the ribs delimit concentric cavities to accommodate heating elements of different heating capacities.
  • a resistance layer is applied to the underside of a carrier plate, which is repeatedly interrupted by radial and concentric incisions to form, for example, meandering heating conductors, such that the areas of the resistance layer take the form of Have circular or circular ring sectors. It is provided here that annular or circular areas of different electrical surface loads arise.
  • a thin-walled metal body has radial stiffening ribs.
  • a heating foil is applied, which can be designed so that the edge zone performance is preferred.
  • a plate-shaped floor heating element for electrical heating devices is known, which is divided by core-shaped, radial slots into sector-like areas which are connected at the plate edge. These sectors, which are individually resilient to a certain extent, are intended to improve contact with an uneven, heated floor.
  • the invention has for its object to design a hotplate heating element according to the preamble of claim 1 so that the special features of the flat conductor technology are advantageously used for heating hotplates in a structurally and technically simple manner. This object is achieved by the features listed in the characterizing part of claim 1. Advantageous developments of the invention result from the following patent claims.
  • the solution according to the invention results in a hotplate heating element which can be designed in a particularly flat design and which opens up the possibility of obtaining different, selectable heating surface loads on the entire, for example circular heating surface, in particular for the parboiling and continued cooking process (normal cooking process).
  • Such box configurations with different heating capacities can be produced in a particularly advantageous manner using the so-called thick-film paste technique.
  • the cross section of all heating conductor tracks or heating conductor sections is the same, it is also possible within the scope of the invention to vary the heating track cross section in order to achieve different heating effects in this way. In the former case, i.e. with a constant cross-section, one becomes different Achieve heating effects by arranging the distances between the heating conductors, for example meandering, at different distances from one another or by providing different gaps between the meandering sections.
  • the exemplary embodiment according to FIG. 1 is, for example, a circular hotplate heating element which can be used directly or indirectly, for example in connection with a trough plate or glass ceramic plate, as hotplate heating.
  • It has as carrier 1 a flat, smooth steel plate made of a scale-resistant material up to approx. 700 ° C., which is preferably provided on both sides with enamel coatings 2 and 3.
  • This metallic carrier 1 is provided with a protective conductor connection, not shown.
  • a thick-film heating conductor track 4 is applied to the underside of the carrier 1 on the enamel layer 3, for example by baking, in the geometric arrangement explained below.
  • This cover layer 5 for example glass layer, has a relatively high dielectric strength at 1250 V.
  • a fastening bolt 7 is provided which extends through and protrudes through the aforementioned layers and is welded to the carrier 1. This mounting bolt 7 is used for mechanical attachment of the hotplate heating element, for example in a hob of the type mentioned.
  • different heating zones are segment-shaped in the form of circular sections of different surfaces.
  • wide, segment-shaped heating zones 24 and narrow segment-shaped heating zones 25 are alternately strung together within the annular overall heating zone 21 with an unheated central zone 22 and an unheated peripheral zone 23.
  • a single heating conductor 4 can be provided here for all heating zones, or it can be a two-circuit heating with a heating conductor for the wide heating zones 24 and a heating conductor for the narrow heating zones 25.
  • the narrow heating zones 25 form the heating Heating zones and the wide heating zones 24 normal cooking heating zones.
  • connection contact surfaces can be provided for the connection of the heating conductor.
  • the individual heating zones are largely thermally decoupled from one another. 1 by insulating webs 26, which are arranged in the region between the heating zones 9 and 10 and preferably also extend through the carrier 1, so that in this way a clear thermal delimitation of the various heating zones or none significant thermal influence on the adjacent heating zone and, if possible, no heat conduction in the support 1 is obtained.
  • insulating bars 26 instead of insulating bars 26 or additionally, between the heating zones, e.g. in the material of the carrier 1 and / or top layer 5, heat sinks e.g. be provided in the form of material constrictions.
  • the hotplate surface can have a plurality of separate heating conductor tracks 4a or 4b, which are illustrated in FIG. 3 on the basis of a circuit diagram.
  • the same or different heating powers can be assigned to these heating conductor tracks, as indicated in FIG. 3 by different numbers of turns.
  • All heating conductor tracks are parallel to one another and can be connected individually or in combination to the power source via a multi-stage switch 38.
  • a total of nine heating levels, consisting of four individual heating levels and five combination heating levels, each with operation of two heating conductor tracks, are obtained through four heating conductor tracks.

Description

Die Erfindung bezieht sich auf ein Kochstellenheizelement gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a hotplate heating element according to the preamble of claim 1.

Bei einer bekannten elektrischen Heizvorrichtung gemäß US-A-1 636 029 sind an der Unterseite eines metallischen Kochplattenkörpers zellenartige, durch Rippen begrenzte Hohlräume vorgesehen, in welchen Heizelemente angeordnet sind. Die Rippen begrenzen zueinander konzentrische Hohlräume zur Unterbringung von Heizelementen unterschiedlicher Heizleistung. Bei einer anderen bekannten Kochplatte gemäß DE-A-31 26 989 ist an der Unterseite einer Trägerplatte eine Widerstandsschicht aufgebracht, die durch radiale und konzentrische Einschnitte zur Bildung z.B. von mäanderförmig verlaufenden Heizleitern mehrfach unterbrochen ist, derart, daß die Bereiche der Widerstandsschicht die Form von Kreis- bzw. Kreisringsektoren aufweisen. Hierbei ist vorgesehen, daß ringförmige oder kreisförmige Bereiche unterschiedlicher elektrischer Oberflächenbelastung entstehen. Bei einer bekannten Massekochplatte gemäß DE-B-1 690 557 besitzt ein dünnwandiger Metallkörper radiale Versteifungsrippen. Auf die Unterseite des Metallkörpers wird eine Heizfolie aufgebracht, die so ausgebildet sein kann, daß die Randzone leistungsmäßig bevorzugt ist. Schließlich ist aus DE-C-807 974 ein plattenförmiger Bodenheizkörper für elektrische Heizgeräte bekannt, welcher durch kernförmige, radiale Schlitze unterteilt ist in sektorenartige Bereiche, die am Plattenrand zusammenhängen. Durch diese in einem gewissen Umfang einzeln federnden Sektoren soll der Kontakt zu einem unebenen, zu beheizenden Boden verbessert werden.In a known electrical heating device according to US-A-1 636 029, cell-like cavities, delimited by ribs, are provided on the underside of a metallic hotplate body, in which heating elements are arranged. The ribs delimit concentric cavities to accommodate heating elements of different heating capacities. In another known hotplate according to DE-A-31 26 989, a resistance layer is applied to the underside of a carrier plate, which is repeatedly interrupted by radial and concentric incisions to form, for example, meandering heating conductors, such that the areas of the resistance layer take the form of Have circular or circular ring sectors. It is provided here that annular or circular areas of different electrical surface loads arise. In a known hotplate according to DE-B-1 690 557, a thin-walled metal body has radial stiffening ribs. On the underside of the metal body, a heating foil is applied, which can be designed so that the edge zone performance is preferred. Finally, from DE-C-807 974 a plate-shaped floor heating element for electrical heating devices is known, which is divided by core-shaped, radial slots into sector-like areas which are connected at the plate edge. These sectors, which are individually resilient to a certain extent, are intended to improve contact with an uneven, heated floor.

Der Erfindung liegt die Aufgabe zugrunde, ein Kochstellenheizelement gemäß dem Oberbegriff des Patentanspruches 1 so zu gestalten, daß in konstruktiv und fertigungstechnisch einfacher Weise die Besonderheiten der Flachleiter-Technik vorteilhaft für die Beheizung von Kochstellen ausgenützt werden. Diese Aufgabe wird erfindungsgemäß gelöst durch die im Kennzeichnungsteil des Patentanspruches 1 aufgeführten Merkmale. Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den nachfolgenden Patentansprüchen.The invention has for its object to design a hotplate heating element according to the preamble of claim 1 so that the special features of the flat conductor technology are advantageously used for heating hotplates in a structurally and technically simple manner. This object is achieved by the features listed in the characterizing part of claim 1. Advantageous developments of the invention result from the following patent claims.

Die erfindungsgemäße Lösung ergibt ein Kochstellenheizelement, das in besonders flacher Bauweise ausgestaltet sein kann und das die Möglichkeit eröffnet, auf der gesamten, z.B. kreisrunden Heizfläche unterschiedliche, wählbare Heizflächenbelastungen zu erhalten, insb. für den Ankoch- und Fortkochvorgang (Normalkochvorgang). Derartige Schachtelkonfigurationen mit unterschiedlichen Heizleistungen lassen sich in besonders vorteilhafter Weise bei Anwendung der sogenannten Dickschichtpasten-Technik herstellen. Obwohl es fertigungstechnisch von Vorteil ist, wenn der Querschnitt sämtlicher Heizleiterbahnen oder Heizleiterabschnitte gleich ist, besteht im Rahmen der Erfindung auch die Möglichkeit, den Heizbahnen-Querschnitt zu variieren, um auf diese Weise unterschiedliche Heizwirkungen zu erzielen. Im erstgenannten Fall, also bei konstantem Querschnitt, wird man unterschiedliche Heizwirkungen erzielen, indem man die Abstände der z.B. mäanderartig verlaufenden Heizleiter mit unterschiedlichem Abstand voneinander anordnet bzw. unterschiedliche Lücken zwischen den Mäanderabschnitten vorsieht.The solution according to the invention results in a hotplate heating element which can be designed in a particularly flat design and which opens up the possibility of obtaining different, selectable heating surface loads on the entire, for example circular heating surface, in particular for the parboiling and continued cooking process (normal cooking process). Such box configurations with different heating capacities can be produced in a particularly advantageous manner using the so-called thick-film paste technique. Although it is advantageous from a manufacturing point of view if the cross section of all heating conductor tracks or heating conductor sections is the same, it is also possible within the scope of the invention to vary the heating track cross section in order to achieve different heating effects in this way. In the former case, i.e. with a constant cross-section, one becomes different Achieve heating effects by arranging the distances between the heating conductors, for example meandering, at different distances from one another or by providing different gaps between the meandering sections.

Die Erfindung ist anhand von in der Zeichnung dargestellten Ausführungsbeispielen nachstehend beschrieben.The invention is described below with reference to exemplary embodiments shown in the drawing.

Es zeigt:

Fig. 1
die Schnittansicht eines Kochstellenheizelementes,
Fig. 2
eine vereinfachte Darstellung einer Ausführungsform mit segmentartigen Heizzonen,
Fig. 3
das Schaltschema eines mit mehreren separaten Heizleiterbahnen ausgerüsteten Kochstellenheizelementes.
It shows:
Fig. 1
the sectional view of a hotplate heating element,
Fig. 2
a simplified representation of an embodiment with segment-like heating zones,
Fig. 3
the circuit diagram of a hotplate heating element equipped with several separate heating conductor tracks.

Beim Ausführungsbeispiel gemäß Fig. 1 handelt es sich z.B. um ein kreisrundes Kochstellenheizelement, das unmittelbar oder mittelbar z.B. in Verbindung mit einer Muldenplatte oder Glaskeramikplatte als Kochplattenheizung dienen kann. Es besitzt als Träger 1 eine ebene, glatte Stahlplatte aus einem bis ca. 700°C zunderbeständigen Material, die vorzugsweise beidseitig mit Emailbeschichtungen 2 und 3 versehen ist. Dieser metallische Träger 1 ist mit einem nicht weiter dargestellten Schutzleiteranschluß versehen. Auf die Unterseite des Trägers 1 auf der Emailschicht 3 z.B. durch Einbrennen aufgebracht ist eine Dickschicht-Heizleiterbahn 4 in nachstehend erläuterter geometrischer Anordnung. Hierauf bedarfsweise aufgebracht, ist eine ebenfalls isolierende Deckschicht 5. Diese Deckschicht 5 z.B. Glasschicht besitzt eine relativ hohe elektrische Durchschlagsfestigkeit bei 1250 V. An der Unterseite der Deckschicht 5 unmittelbar oder mit Abstand angebracht ist eine Reflektorschicht 6 z.B. in Form einer Metalloxydschicht, einer Metallfolie oder dergleichen. Im Zentrum ist ein Befestigungsbolzen 7 vorgesehen, der die vorgenannten Schichten durch- und überragt und am Träger 1 angeschweißt ist. Dieser Befestigungsbolzen 7 dient der mechanischen Befestigung des Kochstellenheizelementes z.B. in einer Kochmulde der eingangs erwähnten Art.The exemplary embodiment according to FIG. 1 is, for example, a circular hotplate heating element which can be used directly or indirectly, for example in connection with a trough plate or glass ceramic plate, as hotplate heating. It has as carrier 1 a flat, smooth steel plate made of a scale-resistant material up to approx. 700 ° C., which is preferably provided on both sides with enamel coatings 2 and 3. This metallic carrier 1 is provided with a protective conductor connection, not shown. A thick-film heating conductor track 4 is applied to the underside of the carrier 1 on the enamel layer 3, for example by baking, in the geometric arrangement explained below. Applied to this if necessary, is also insulating Cover layer 5. This cover layer 5, for example glass layer, has a relatively high dielectric strength at 1250 V. A reflector layer 6, for example in the form of a metal oxide layer, a metal foil or the like, is attached to the underside of the cover layer 5 directly or at a distance. In the center, a fastening bolt 7 is provided which extends through and protrudes through the aforementioned layers and is welded to the carrier 1. This mounting bolt 7 is used for mechanical attachment of the hotplate heating element, for example in a hob of the type mentioned.

Wie aus Fig. 2 ersichtlich, sind verschiedene Heizzonen segmentförmig ausgebildet in Form von Kreisausschnitten unterschiedlicher Oberfläche. Hierbei sind innerhalb der ringförmigen Gesamtheizzone 21 mit unbeheizter Mittelzone 22 und unbeheizter Randzone 23 breite, segmentförmige Heizzonen 24 und schmale segmentförmige Heizzonen 25 abwechselnd aneinandergereiht. Es kann hier für alle Heizzonen eine einzige Heizleiterbahn 4 vorgesehen sein, oder aber es kann sich um eine Zweikreisheizung handeln mit einer Heizleiterbahn für die breiten Heizzonen 24 und einer Heizleiterbahn für die schmalen Heizzonen 25. Im letztgenannten Fall bilden die schmalen Heizzonen 25 die Ankoch-Heizzonen und die breiten Heizzonen 24 Normalkoch-Heizzonen. Im erstgenannten Fall erhält man aufgrund der unterschiedlich großen beheizten Flächen dieser Zonen unterschiedliche Heizwirkungen. In der unbeheizten Mittelzone 22 oder aber in der Randzone 23 können Anschlußkontaktflächen für den Anschluß der Heizleiterbahn vorgesehen sein.As can be seen from FIG. 2, different heating zones are segment-shaped in the form of circular sections of different surfaces. Here, wide, segment-shaped heating zones 24 and narrow segment-shaped heating zones 25 are alternately strung together within the annular overall heating zone 21 with an unheated central zone 22 and an unheated peripheral zone 23. A single heating conductor 4 can be provided here for all heating zones, or it can be a two-circuit heating with a heating conductor for the wide heating zones 24 and a heating conductor for the narrow heating zones 25. In the latter case, the narrow heating zones 25 form the heating Heating zones and the wide heating zones 24 normal cooking heating zones. In the former case, different heating effects are obtained due to the different sized heated areas of these zones. In the unheated middle zone 22 or in the edge zone 23, connection contact surfaces can be provided for the connection of the heating conductor.

Bei allen Ausführungsbeispielen ist es vorteilhaft, wenn die einzelnen Heizzonen thermisch weitgehend voneinander entkoppelt sind. Dies kann gemäß Fig. 1 erfolgen durch isolierende Stege 26, die im Bereich zwischen den Heizzonen 9 und 10 angeordnet sind und vorzugsweise sich auch bis durch den Träger 1 hindurch erstrecken, so daß auf diese Weise eine klare thermische Abgrenzung der verschiedenen Heizzonen bzw. keine wesentliche thermische Beeinflussung der jeweils benachbarten Heizzone und möglichst auch keine Wärmeleitung im Träger 1 erhalten wird. Anstelle von Isolierstegen 26 oder zusätzlich können zwischen den Heizzonen, z.B. im Material des Trägers 1 und/oder Deckschicht 5, Wärmesenken z.B. in Form von Materialverengungen vorgesehen sein.In all of the exemplary embodiments, it is advantageous if the individual heating zones are largely thermally decoupled from one another. 1 by insulating webs 26, which are arranged in the region between the heating zones 9 and 10 and preferably also extend through the carrier 1, so that in this way a clear thermal delimitation of the various heating zones or none significant thermal influence on the adjacent heating zone and, if possible, no heat conduction in the support 1 is obtained. Instead of insulating bars 26 or additionally, between the heating zones, e.g. in the material of the carrier 1 and / or top layer 5, heat sinks e.g. be provided in the form of material constrictions.

Bei dem Ausführungsbeispiel gemäß Fig. 2 kann die Kochstellenfläche mehrere separate Heizleiterbahnen 4a bzw. 4b besitzen, die in Fig. 3 anhand eines Schaltschemas verdeutlicht sind. Diesen Heizleiterbahnen können jeweils gleiche oder unterschiedliche Heizleistungen zugeordnet sein, wie in Fig. 3 durch unterschiedliche Windungsanzahl angedeutet. Sämtliche Heizleiterbahnen liegen zueinander parallel und sind einzeln oder in Kombination über einen mehrstufenschalter 38 anschließbar an die Stromquelle. Man erhält so durch vier Heizleiterbahnen insgesamt neun Heizstufen, bestehend aus vier Einzel-Heizstufen und fünf Kombinations-Heizstufen mit Betrieb jeweils zweier Heizleiterbahnen.In the exemplary embodiment according to FIG. 2, the hotplate surface can have a plurality of separate heating conductor tracks 4a or 4b, which are illustrated in FIG. 3 on the basis of a circuit diagram. The same or different heating powers can be assigned to these heating conductor tracks, as indicated in FIG. 3 by different numbers of turns. All heating conductor tracks are parallel to one another and can be connected individually or in combination to the power source via a multi-stage switch 38. A total of nine heating levels, consisting of four individual heating levels and five combination heating levels, each with operation of two heating conductor tracks, are obtained through four heating conductor tracks.

Claims (8)

  1. Cooking position heating element with at least two heat conductor tracks applied to a support and arranged in segmental zones, characterised thereby that the segments, which are shaped as sectors of a circle, form zones (24, 25) which are of different heating power and which follow one another in alternation.
  2. Cooking position heating element according to claim 1, characterised thereby that the normal heating zones (24) and parboiling heating zones (25) follow one another in alternation and that the normal heating zones (24) have larger heated areas than the parboiling heating zones (25).
  3. Cooking position heating element according to one of the preceding claims, characterised thereby that the distribution pattern of all heat conductor tracks or sections is the same and the cross-section of the heat conductor track in the different zones is different.
  4. Cooking position heating element according to one of claims 1 to 3, characterised thereby that the cross-section of the heat conductor track or of its section in the outermost heating zone is smaller than that of the remaining heat conductor tracks.
  5. Cooking position heating element according to one of the preceding claims, characterised thereby that the heat conductors of the different zones or sections are energisable connected individually or together in different circuit combinations by way of a multistage switch.
  6. Cooking position heating element according to one of the preceding claims, characterised thereby that the heat conductor tracks are applied in sealing layer paste technique.
  7. Cooking position heating element according to one of the preceding claims characterised thereby that an electrical measuring resistance track (19), which serves for the controlling or regulating of the heating power in dependence on the heating energy acting on it, is arranged in an unheated zone (12) of the cooking position area (8).
  8. Cooking position heating element according to claim 7, characterised thereby that the measuring resistance track (19) is arranged at the edge region of the cooking position heating element.
EP19860116385 1985-12-20 1986-11-25 Heating element of a cooking appliance Expired - Lifetime EP0230555B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853545443 DE3545443A1 (en) 1985-12-20 1985-12-20 COOKING HEATING ELEMENT
DE3545443 1985-12-20

Publications (3)

Publication Number Publication Date
EP0230555A2 EP0230555A2 (en) 1987-08-05
EP0230555A3 EP0230555A3 (en) 1988-03-09
EP0230555B1 true EP0230555B1 (en) 1993-03-10

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Family Applications (1)

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EP19860116385 Expired - Lifetime EP0230555B1 (en) 1985-12-20 1986-11-25 Heating element of a cooking appliance

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DE (2) DE3545443A1 (en)

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ES2079293B1 (en) * 1993-09-28 1998-01-16 Eika S Coop Ltda HEATING DEVICE FOR COOKING PLATE.
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AU1030897A (en) * 1995-12-04 1997-06-27 Aktiebolaget Electrolux A resistive heating element for a cooker
GB9805751D0 (en) * 1998-03-17 1998-05-13 Strix Ltd Electric heaters
DE19853388A1 (en) * 1998-11-19 2000-05-25 Ego Elektro Geraetebau Gmbh Electric heater, especially cooker hot plate, has ceramic bearer, electrical heating element on underside bounded by contact track attached to bearer and connected to protective arrangement
DE10103299B4 (en) * 2001-01-25 2010-08-05 BSH Bosch und Siemens Hausgeräte GmbH Kochmuldenheizvorrichtung
DE10104787B4 (en) * 2001-01-29 2006-01-26 E.G.O. Elektro-Gerätebau GmbH Method for heating a cooking plate
DE10235780A1 (en) * 2002-08-05 2004-02-19 BSH Bosch und Siemens Hausgeräte GmbH Cooking ring with hot plate and reinforcement sandwiching electrical heater, includes thin flexible hotplate with reinforcing ceramic structure below it
ES2564889B1 (en) * 2014-09-24 2017-01-04 BSH Electrodomésticos España S.A. Home appliance device and procedure for manufacturing a home appliance device
ES2564760B1 (en) * 2014-09-24 2017-01-04 BSH Electrodomésticos España S.A. Home appliance device and procedure for manufacturing a home appliance device
KR102177948B1 (en) 2018-10-16 2020-11-12 엘지전자 주식회사 Electric Heater

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Publication number Publication date
DE3545443A1 (en) 1987-06-25
EP0230555A3 (en) 1988-03-09
EP0230555A2 (en) 1987-08-05
DE3687968D1 (en) 1993-04-15

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