EP0754918B1 - Cooking hob with a sensor arrangement for cooker heating elements. - Google Patents

Cooking hob with a sensor arrangement for cooker heating elements. Download PDF

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Publication number
EP0754918B1
EP0754918B1 EP96710007A EP96710007A EP0754918B1 EP 0754918 B1 EP0754918 B1 EP 0754918B1 EP 96710007 A EP96710007 A EP 96710007A EP 96710007 A EP96710007 A EP 96710007A EP 0754918 B1 EP0754918 B1 EP 0754918B1
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EP
European Patent Office
Prior art keywords
cooking
cooking surface
surface according
heating
monitoring sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96710007A
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German (de)
French (fr)
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EP0754918A1 (en
Inventor
Günter Dipl.-Ing. Zschau (FH)
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
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Publication of EP0754918A1 publication Critical patent/EP0754918A1/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/74—Non-metallic plates, e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits
    • H05B3/746—Protection, e.g. overheat cutoff, hot plate indicator

Definitions

  • the invention relates to a cooking surface with a sensor arrangement for hotplate heating elements, which are either radiant or mass radiators and are connected to cooktop layers made of metallic or non-metallic Materials of limited layer thickness exist.
  • a cooking surface is known from the publication US Pat. No. 4,286,377, which has a temperature sensor having. This is connected to a safety circuit around the mains supply to interrupt when the heating element of the hob is a certain temperature reached from which the heating element or the glass ceramic plate are damaged can.
  • the object of the invention is therefore to provide an effective and inexpensive monitoring method against breakage of radiant heaters and cooking surfaces of the above Way to create.
  • the arrangement according to the invention for solving this problem is characterized in that that a safety circuit fed by at least one monitoring sensor Radiant heat sources and / or heat conducting heat sources if the radiant heater breaks or switches off the hob.
  • a safety circuit fed by at least one monitoring sensor Radiant heat sources and / or heat conducting heat sources if the radiant heater breaks or switches off the hob.
  • An advantageous embodiment of the Invention is characterized in that the monitoring sensor from a monitoring conductor is formed, which encloses the heat source to be monitored. Further advantageous embodiments of the invention are contained in the subclaims. An embodiment according to the invention is below with reference to the drawing described in more detail.
  • a heat-conducting plate with a monitoring sensor can be seen, in detail from a heat-conducting carrier 1, a heating medium 2, from electrical Contacts 3 for the heating medium 2, from the monitoring conductor 4, and the voltage supply contacts 7 for the surveillance conductor track 4.
  • the associated 2 shows a cooking surface, for example glass ceramic cooking surface or glass surface, which is equipped with four individually monitored hotplates according to Fig.1.
  • the cooking surface 6 has a monitoring path 5, which encloses all hotplates and breaks in the vicinity of the hotplate or in the glass ceramic cooktop.
  • the Heat sources at risk of breakage for example heat-conducting layer heat sources, are through the application of at least one monitoring conductor track 4, 5 to voltage, overheating, Fatigue breaks monitored.
  • the monitoring path 4, 5 is included a safety circuit connected to the radiant heat sources and / or heat conducting heat sources switches off in the event of an accident. This usually happens because the monitoring path 4, 5 is connected to the control circuit of a relay circuit, which is connected in series to the respective radiator and switches off all poles, if an interruption of the monitoring path 4, 5 occurs in the monitoring circuit.
  • the relay for controlling the safety circuit can use a safety extra-low voltage be connected by a separately feeding transformer.
  • the requirements for the surveillance track are that it is sensibly protective is arranged around the heat sources, consists of sufficiently thin material, for example Gold, nickel silver, graphite, and by vapor deposition, sputtering or printing is applied.
  • the heating source can be assumed to be safe that the monitoring sensor 4, 5 also interrupts and thus triggers the safety circuit.
  • Both the monitoring sensor or sensors as well as the heat source structure can be designed in different ways his.
  • the structural shape of the heat source to be monitored can be changed, be applied in spiral orbits or in concentric orbits. It makes sense, to execute the monitoring sensor so that it conforms to the respective heat source structure largely approximated.
  • An inner and an outer monitoring sensor can be arranged be able to switch off different heating circuits if they break, whereby at least one of these several monitoring sensors 4, 5 for pot detection purposes is also usable. According to FIG.
  • the arrangement also provides that the monitoring sensor of each individual hotplate of a cooktop is assigned and the cooking surface itself also protects against breakage.
  • the hotplate is designed as a heat-conducting plate, its mass-determining electrical non-conductive layer of a silicon compound, for example silicon nitrite or silicon carbide, the monitoring sensor must have at least one closed Close surrounding of the heating surface.
  • thermal plates of the aforementioned type exist in particular in that with silicon nitride or silicon carbide substrates equipped heat conducting sources compared to previously known heating sources a very have a short comparison cooking time. Even the overall efficiency of such special Thermal plates are above 80% and thus significantly higher than previously known Heat source arrangements. The one that may occur at higher energies To master the likelihood of a heat break, it is necessary to security given by the arrangement according to the invention by means of a monitoring sensor to provide.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Electric Stoves And Ranges (AREA)
  • Resistance Heating (AREA)

Description

Die Erfindung bezieht sich auf eine Kochfläche mit einer Sensoranordnung für Kochstellenheizelemente, die entweder Strahlungsheizkörper oder Masseheizkörper sind und mit Kochfeldschichten in Verbindung stehen, die aus metallischen oder nichtmetallischen Materialien begrenzter Schichtdicke bestehen.The invention relates to a cooking surface with a sensor arrangement for hotplate heating elements, which are either radiant or mass radiators and are connected to cooktop layers made of metallic or non-metallic Materials of limited layer thickness exist.

Aus der Druckschrift US 4,286,377 ist eine Kochfläche bekannt, die einen Temperatursensor aufweist. Dieser ist verbunden mit einer Sicherheitsschaltung um die Netzversorgung zu unterbrechen, wenn das Heizelement der Kochfläche eine bestimmte Temperatur erreicht, ab der das Heizelement oder die Glaskeramikplatte beschädigt werden können.A cooking surface is known from the publication US Pat. No. 4,286,377, which has a temperature sensor having. This is connected to a safety circuit around the mains supply to interrupt when the heating element of the hob is a certain temperature reached from which the heating element or the glass ceramic plate are damaged can.

Kommen Glaskeramik-Kochflächen, Glaskochflächen oder Heizungen, die auf Siliziumbasis des Trägermaterials beruhen zu Bruch, so kann es zu Netzspannungsberührungen der aufgesetzten Metalltöpfe kommen, welche durch die eindringende Feuchtigkeit in die Bruchfläche bedingt ist. Da es bisher ausschließbar war, daß solche Brüche diesbezügliche Folgen haben, erfolgte bei Beschädigung der vorgenannten Platten zunächst keine zwangsläufige Netztrennung. Werden Spezialwärmeleitplatten auf Silizium-Nitrit-bzw. Silizium-Karbitbasis verwendet, und kommt es infolge hoher thermischer Belastung zu Rissen oder Brüchen, so stellt sich dieser Vorgang besonders kritisch dar, da der jeweilige Heizleiter bei dem vorgenannten Trägermaterial entweder direkt aufgedampft bzw. gespattert ist oder beispielsweise als Graphitfolie ebenso direkt anliegt. Durch die begrenzte Dicke der genannten Silizium-Nitrit- bzw. Silizium-Karbitträgerschichten ist bei Bruch derselben mit einer notwendigen Netztrennung zu begegnen, um lebensbedrohliche Situationen infolge Kontaktierung der Netzspannung über Kriechstrecken mit den Topfböden zu verhindern. Come glass ceramic cooktops, glass cooktops or heaters that are silicon based of the carrier material are due to breakage, so there may be mains voltage contacts of the attached metal pots, which are caused by the penetrating moisture in the fracture surface. Since it was previously excluded that such breaks related to this Consequences occurred when the aforementioned plates were damaged no inevitable disconnection from the grid. Are special heat conducting plates on silicon nitrite or. Silicon carbide base is used, and it occurs due to high thermal stress to cracks or breaks, this process is particularly critical because the respective Heat conductor either directly evaporated on the aforementioned carrier material or is spattered or, for example, also lies directly as a graphite foil. Through the limited thickness of the silicon nitride or silicon carbide support layers mentioned is at Counteracting the same with a necessary network disconnection to prevent life-threatening Situations as a result of contacting the mains voltage via creepage distances with the To prevent pot bottoms.

Aufgabe der Erfindung ist es daher, eine wirksame und kostengünstige Überwachungsmethode gegen Bruch von Strahlungsheizkörpern und Kochflächen der genannten Art zu erstellen.The object of the invention is therefore to provide an effective and inexpensive monitoring method against breakage of radiant heaters and cooking surfaces of the above Way to create.

Die erfindungsgemäße Anordnung zur Lösung dieser Aufgabe ist dadurch gekennzeichnet, daß eine von mindestens einem Überwachungssensor gespeiste SicherheitsSchaltung Strahlungsheizquellen und/oder Wärmeleitheizquellen bei Bruch des Strahlungsheizkörpers oder der Kochfläche abschaltet. Eine vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß der Überwachungssensor aus einer Überwachungsleiterbahn gebildet ist, die die zu überwachende Heizquelle umschließt. Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen enthalten. Ein Ausführungsbeispiel nach der Erfindung ist im folgenden anhand der Zeichnung näher beschrieben.The arrangement according to the invention for solving this problem is characterized in that that a safety circuit fed by at least one monitoring sensor Radiant heat sources and / or heat conducting heat sources if the radiant heater breaks or switches off the hob. An advantageous embodiment of the Invention is characterized in that the monitoring sensor from a monitoring conductor is formed, which encloses the heat source to be monitored. Further advantageous embodiments of the invention are contained in the subclaims. An embodiment according to the invention is below with reference to the drawing described in more detail.

Es zeigen

Fig. 1
einen Überwachungssensor auf einer Wärmeleitheizquelle,
Fig. 2
eine Kochfeldanordnung mit Überwachungssensoren.
Show it
Fig. 1
a monitoring sensor on a heat conducting heat source,
Fig. 2
a cooktop with monitoring sensors.

Gemäß Fig.1 ist eine Wärmeleitplatte mit Überwachungssensor erkennbar, die im einzelnen aus einem wärmeleitenden Träger 1, einem Heizmedium 2, aus elektrischen Kontakten 3 für das Heizmedium 2, aus der Überwachungsleiterbahn 4, und den Spannungszuführungskontakten 7 für die Überwachungsleiterbahn 4 besteht. Die zugehörige Fig.2 zeigt eine Kochfläche, beispielsweise Glaskeramik-Kochfläche oder Glasfläche, die mit vier einzeln überwachten Kochstellen gemäß Fig.1 bestückt ist. Die Kochfläche 6 besitzt eine Überwachungsbahn 5, die alle Kochstellen umschließt und Brüche in Umgebung der Kochstelle bzw. in der Glaskeramik-Kochfläche signalisiert. Die bruchgefährdeten Heizquellen, beispielsweise Wärmeleitschichtheizquellen, sind durch das Aufbringen mindestens einer Überwachungsleiterbahn 4, 5 auf Spannungs-, Überhitzungs-, Ermüdungsbrüche hin überwacht. Dabei ist die Überwachungsbahn 4, 5 mit einer Sicherheitsschaltung verbunden, die die Strahlungsheizquellen und/oder Wärmeleitheizquellen in Havariefällen abschaltet. Dies geschieht in der Regel dadurch, daß die Überwachungsbahn 4, 5 mit dem Steuerkreis einer Relaisschaltung verbunden ist, welche in Reihe zu dem jeweiligen Heizkörper geschaltet ist und diese allpolig abschaltet, falls im Überwachungskreis eine Unterbrechung der Überwachungsbahn 4, 5 auftritt. Das Relais für die Steuerung der Sicherheitsschaltung kann dabei mit einer Sicherheitskleinspannung durch einen separat speisenden Transformator verbunden sein. Die Anforderungen an die Überwachungsbahn bestehen darin, daß sie sinnvoll schützend um die Heizquellen angeordnet ist, aus genügend dünnem Material besteht, beispielsweise Gold, Neusilber, Graphit, und durch Aufdampfen, Aufspattern bzw. Aufdrucken aufgebracht ist. Unter diesen Umständen ist es beim Bruch der zu überwachenden Heizquelle als sicher anzunehmen, daß der Überwachungssensor 4, 5 ebenfalls unterbricht und somit die Sicherheitsschaltung auslöst. Sowohl der oder die Überwachungssensoren als auch die Heizquellenstruktur können verschiedenartig ausgeführt sein. Die zu überwachende Heizquelle kann ihrer Strukturform nach meänderartig, in Spiralkreisbahnen oder in konzentrischen Kreisbahnen aufgebracht sein. Es ist sinnvoll, den Überwachungssensor so auszuführen, daß er sich der jeweiligen Heizquellenstrukturform weitgehend annähert. Für spezielle Ausführungsformen der Heizquelle, beispielsweise für geometrisch größere Heizflächen mit entsprechend größerer Gesamtheizleistung, kann ein innerer und ein äußerer Überwachungssensor angeordnet sein, der unterschiedliche Heizkreise abschalten kann, falls sie zu Bruch kommen, wobei mindestens einer dieser mehreren Überwachungssensoren 4, 5 für Topferkennungszwecke zusätzlich nutzbar ist. Gemäß Fig.2 ist außerdem anordnungsmäßig vorgesehen, daß der Überwachungssensor jeder einzelnen Kochstelle einer Kochfläche zugeordnet ist und die Kochfläche selbst ebenso gegen Bruch zusätzlich schützt. Im Fall der Ausführung der Kochstelle als Wärmeleitplatte, deren massebestimmende elektrische nichtleitende Schicht einer Siliziumverbindung, beispielsweise Silizium-Nitrit oder Silizium-Karbit ist, muß der Überwachungssensor die mindestens eine geschlossene Heizfläche dicht umgeben.According to FIG. 1, a heat-conducting plate with a monitoring sensor can be seen, in detail from a heat-conducting carrier 1, a heating medium 2, from electrical Contacts 3 for the heating medium 2, from the monitoring conductor 4, and the voltage supply contacts 7 for the surveillance conductor track 4. The associated 2 shows a cooking surface, for example glass ceramic cooking surface or glass surface, which is equipped with four individually monitored hotplates according to Fig.1. The cooking surface 6 has a monitoring path 5, which encloses all hotplates and breaks in the vicinity of the hotplate or in the glass ceramic cooktop. The Heat sources at risk of breakage, for example heat-conducting layer heat sources, are through the application of at least one monitoring conductor track 4, 5 to voltage, overheating, Fatigue breaks monitored. The monitoring path 4, 5 is included a safety circuit connected to the radiant heat sources and / or heat conducting heat sources switches off in the event of an accident. This usually happens because the monitoring path 4, 5 is connected to the control circuit of a relay circuit, which is connected in series to the respective radiator and switches off all poles, if an interruption of the monitoring path 4, 5 occurs in the monitoring circuit. The relay for controlling the safety circuit can use a safety extra-low voltage be connected by a separately feeding transformer. The requirements for the surveillance track are that it is sensibly protective is arranged around the heat sources, consists of sufficiently thin material, for example Gold, nickel silver, graphite, and by vapor deposition, sputtering or printing is applied. In these circumstances, it is when the monitored one breaks The heating source can be assumed to be safe that the monitoring sensor 4, 5 also interrupts and thus triggers the safety circuit. Both the monitoring sensor or sensors as well as the heat source structure can be designed in different ways his. The structural shape of the heat source to be monitored can be changed, be applied in spiral orbits or in concentric orbits. It makes sense, to execute the monitoring sensor so that it conforms to the respective heat source structure largely approximated. For special embodiments of the heating source, for example for geometrically larger heating surfaces with a correspondingly larger total heating output, An inner and an outer monitoring sensor can be arranged be able to switch off different heating circuits if they break, whereby at least one of these several monitoring sensors 4, 5 for pot detection purposes is also usable. According to FIG. 2, the arrangement also provides that the monitoring sensor of each individual hotplate of a cooktop is assigned and the cooking surface itself also protects against breakage. in the In case the hotplate is designed as a heat-conducting plate, its mass-determining electrical non-conductive layer of a silicon compound, for example silicon nitrite or silicon carbide, the monitoring sensor must have at least one closed Close surrounding of the heating surface.

Die Vorteile, die mit Wärmeleitplatten der vorgenannten Art verbunden sind, bestehen insbesondere darin, daß die mit Trägermaterialien aus Silizium-Nitrit bzw. Silizium-Karbit ausgerüsteten Wärmeleitquellen gegenüber bisher bekannten Heizquellen eine sehr kurze Vergleichsankochzeit besitzen. Auch der Gesamtwirkungsgrad solcher spezieller Wärmeleitplatten liegt oberhalb von 80 % und damit deutlich über bisher bekannten Heizquellenanordnungen. Um die möglicherweise bei höheren Energien auftretende Wahrscheinlichkeit eines Erwärmungsbruches zu beherrschen, ist es notwendig, die mit der erfindungsgemäßen Anordnung gegebene Sicherheit mittels Überwachungssensor vorzusehen.The advantages associated with thermal plates of the aforementioned type exist in particular in that with silicon nitride or silicon carbide substrates equipped heat conducting sources compared to previously known heating sources a very have a short comparison cooking time. Even the overall efficiency of such special Thermal plates are above 80% and thus significantly higher than previously known Heat source arrangements. The one that may occur at higher energies To master the likelihood of a heat break, it is necessary to security given by the arrangement according to the invention by means of a monitoring sensor to provide.

Claims (10)

  1. Cooking surface with a sensor arrangement for cooking place heating elements, which are either radiant heating bodies or solid heating bodies and stand in connection with cooking field coatings consisting of metallic or non-metallic materials of limited layer thickness, characterised in that a safety circuit fed by at least one monitoring sensor (4, 5) switches off radiant heating sources and/or heat-conducting heating sources on fracture of the radiant heating body or cooking surface (6).
  2. Cooking surface according to claim 1, characterised in that the monitoring sensor (4, 5) is formed from a monitoring conductor track, which encloses the heating source to be monitored.
  3. Cooking surface according to claim 1, 2, characterised in that the heating source to be monitored is meander-like in its structural form.
  4. Cooking surface according to claim 1, 2, characterised in that the heating source to be monitored is structured in its form in concentric circular tracks or spirally circular tracks, wherein the at least one monitoring sensor (4, 5) approximates the respective heating source structure.
  5. Cooking surface according to claim 1, characterised in that an inner and an outer monitoring sensor are arranged for geometrically larger, and thus stronger output, heating areas.
  6. Cooking surface according to claim 1, 5, characterised in that the monitoring sensor (4, 5) is usable for pot recognition purposes.
  7. Cooking surface according to claim 1, characterised in that the monitoring sensor (4, 5) of each individual cooking place is a cooking area and able to be associated with this alone.
  8. Cooking surface according to claim 1, characterised in that the cooking place is a heat conducting plate, the electrically non-conductive and mass-determining layer of which is a silicon compound.
  9. Cooking surface according to claim 1, 9, characterised in that the cooking place is a heat conducting plate, the electrically non-conductive and mass-determining layer of which consists of silicon nitride.
  10. Cooking surface according to claim 1, characterised in that the cooking place is a heat conducting plate, the electrically non-conductive and mass-determining layer of which consists of silicon carbide.
EP96710007A 1995-07-20 1996-07-03 Cooking hob with a sensor arrangement for cooker heating elements. Expired - Lifetime EP0754918B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29511740U DE29511740U1 (en) 1995-07-20 1995-07-20 Sensor arrangement for hotplate heating elements
DE29511740U 1995-07-20

Publications (2)

Publication Number Publication Date
EP0754918A1 EP0754918A1 (en) 1997-01-22
EP0754918B1 true EP0754918B1 (en) 2000-09-20

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ID=8010784

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96710007A Expired - Lifetime EP0754918B1 (en) 1995-07-20 1996-07-03 Cooking hob with a sensor arrangement for cooker heating elements.

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EP (1) EP0754918B1 (en)
DE (2) DE29511740U1 (en)
ES (1) ES2151648T3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19629155C2 (en) * 1996-07-19 2001-06-07 Ggt Ges Fuer Gerontotechnik Mb Method and device for safety shutdown of electrical cooking appliances
DE19820108C2 (en) * 1998-05-06 2001-03-15 Schott Glas Arrangement of a heat-conducting ceramic carrier with a heating element as a cooking zone in a recess in a cooking surface
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

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4286377A (en) * 1978-07-03 1981-09-01 General Electric Company Method of manufacture for a resistance heater and temperature sensor
DE3105065A1 (en) * 1981-02-12 1982-08-19 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Glass-ceramic hotplate
DE3345991A1 (en) * 1983-12-20 1985-06-27 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Arrangement for the power regulation of electrical cooking plates, preferably glass-ceramic cooking plates
FR2609533B1 (en) * 1987-01-13 1990-05-25 Cableco Sa ELECTRIC INDUCTION HEATER

Also Published As

Publication number Publication date
DE59605907D1 (en) 2000-10-26
ES2151648T3 (en) 2001-01-01
DE29511740U1 (en) 1995-10-05
EP0754918A1 (en) 1997-01-22

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