EP0028356A1 - Temperaturmelder zur Anzeige des Temperaturzustandes einer Glaskeramik-Kochfläche - Google Patents

Temperaturmelder zur Anzeige des Temperaturzustandes einer Glaskeramik-Kochfläche Download PDF

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Publication number
EP0028356A1
EP0028356A1 EP19800106438 EP80106438A EP0028356A1 EP 0028356 A1 EP0028356 A1 EP 0028356A1 EP 19800106438 EP19800106438 EP 19800106438 EP 80106438 A EP80106438 A EP 80106438A EP 0028356 A1 EP0028356 A1 EP 0028356A1
Authority
EP
European Patent Office
Prior art keywords
temperature
glass ceramic
temperature detector
detector according
housing
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.)
Withdrawn
Application number
EP19800106438
Other languages
German (de)
English (en)
French (fr)
Inventor
Gerhard Gössler
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.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Gerate Blanc und Fischer GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Publication of EP0028356A1 publication Critical patent/EP0028356A1/de
Withdrawn legal-status Critical Current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
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0258—For cooking
    • H05B1/0261—For cooking of food
    • H05B1/0266—Cooktops
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • 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 temperature detector for displaying the temperature state of a glass ceramic cooktop according to the preamble of claim 1.
  • a signal device is already known (DE-OS 26 27 373) in which a temperature sensor is arranged in direct contact with the heating of the glass ceramic cooking surface and actuates a switch for actuating a signal element.
  • the cooling time of the cooktop is not always constant from a certain temperature, but depends on which objects are on the cooktop. If e.g. a large saucepan with boiling oil is on the cooking surface, the cooling of the cooking surface takes much longer than if there were no such saucepan.
  • the known display device cannot take these differences into account.
  • the actual switch is exposed to very high temperatures, so that a second switch is provided which switches off the auxiliary heating at an elevated temperature.
  • the invention has for its object to further develop and improve a temperature detector of the type mentioned in the introduction such that on the one hand it detects the temperature of the cooking surface heating as precisely as possible but on the other hand it is not damaged by the high continuous temperatures of the heating. It should respond quickly when heating up, but should not give false results when the glass surface cools down.
  • the switch itself which is outside the heated area, is not exposed to excessive high temperatures, and that the temperature detector delivers a correct result even if the cooling time of the cooking surface is possibly caused by objects on it .
  • High heat capacity is extended.
  • the thermal coupling of the temperature sensor to the heating or the glass ceramic surface can be achieved by appropriate design of the housing, by the distance between the temperature sensor and the heating or cooking surface, by the selection of the heat transfer and by appropriate heat insulation of the housing.
  • the temperature sensor can be a preferably bimetallic expansion element, while the auxiliary heating can be connected in parallel to the heating of the glass ceramic.
  • the switch can be designed as a snap switch in order to prevent radio interference.
  • the invention provides that the switch, the temperature sensor and the auxiliary heating are arranged in a housing which is open on one side and can be fixed by insertion.
  • This housing is preferably arranged in the region of the connection of the glass ceramic heater, where it can be fastened by pushing it into a cutout in the edge of the support shell of the glass ceramic carrying the heater.
  • the temperature detector can be designed such that it forms the carrier for the connections of the glass ceramic heating.
  • the auxiliary heater can be a normal resistor, but it is particularly favorable if it is designed as a PTC resistor. With the help of this type of resistor it is achieved that when the heating is switched on, the signal device is displayed quickly, while in continuous operation only a small current flows through the PTC resistor.
  • the auxiliary heating can preferably be fixed between two electrodes by spring action.
  • Either the electrodes themselves can have a spring action, or a spring can be provided which presses one electrode against the resistance and the other electrode.
  • the temperature sensor is in heat-conducting connection with the one electrode of the auxiliary heating.
  • This heat conduction can be produced, for example, in that a section of the temperature sensor lies directly on the electrode.
  • This electrode can also serve to form a partition to the switch room.
  • the invention further proposes that the Curie temperature of the PTC resistor is below the intrinsic temperature of the connection which arises in continuous operation, while the permissible continuous temperature of the PTC resistor is above this Own temperature is.
  • the invention thus proposes a temperature detector, the response characteristic of which is determined by the auxiliary heating when the heating of the glass ceramic surface is switched on, while the characteristic of the temperature detector when the heating is switched off is determined by the heat given off by the glass ceramic surface.
  • the radiant heater 11 of a glass ceramic cooktop can be seen schematically.
  • the heater 12 of the glass ceramic cooking surface is accommodated in the radiant heater 11.
  • an upwardly open housing 14 is inserted, through which the connections 16 of the heater 12, which end in flat plug-in connections 15, are carried out.
  • a first electrode 17 is attached to the upper tongue 15, which is bent downwards at right angles, and whose lower end 18 is accommodated in a corresponding slot-like recess 19 in the housing 14.
  • a spring 20 is connected to the other tongue 15, which is bent upward at approximately a right angle and whose middle part 21 is supported on the housing.
  • a second electrode 23 and a PTC resistor 24 are clamped between the upper end part 22 of the spring 20 and the free part of the electrode 17.
  • the spring action with which the upper end part 22 of the spring 20 is pressed against the electrode 23, the PTC resistor 24 and the electrode 17 creates a good electrical transition between these parts. Since the connection of those parts of the electrode 17 or the spring 20 that run parallel to the corresponding connector pins 15 is electrically conductive, a parallel connection of the PTC resistor 24 to the heating 12 of the glass ceramic cooktop is produced with the aid of this arrangement.
  • the lower end 25 of a bimetal lever 26 is connected to the lower end 18 of the electrode 17.
  • the bimetal lever 26 is angled approximately Z-shaped to the left, so that it can bend freely in the figure to the right or to the left.
  • the bimetallic lever 26 is in the area of its upper end 27 provided with an electrically insulating insert 28 against which the adjusting screw 29 of a transmission lever 30 presses.
  • the lower end 31 of the transmission lever 30 is fastened by means of a slight bend in a corresponding slot 32 in the housing 14.
  • the transmission lever 30 has in its central section an approximately V-shaped bend 33, the apex 34 of which presses on the actuating part 35 of a snap switch 36.
  • a pair of contacts 37 and 38 are arranged, which are open in the position shown in the figure.
  • the contact 37 is connected to the plug pin 39 via the snap switch 36, while the contact 38 is connected to the plug pin 40.
  • the plug pins 39 and 40 are switched into a circuit which, in addition to a voltage source 41, has a signal element 42, e.g. a glow lamp.
  • the bimetallic lever 26 is arranged such that it bends to the right as the temperature increases in the figure. The position shown thus shows the temperature detector according to the invention in the cold state.
  • the mode of operation of the temperature detector according to the invention is as follows: When voltage is applied to the tongues 15, both the heater 12 of the glass ceramic cooktop and the PTC resistor 24 are heated. Since the PTC resistor has a relatively low resistance value in the cold state, it heats up quickly, which immediately leads to a deflection of the bimetal lever 26 to the right. Since the transmission lever 30 is biased such that it also moves to the right and follows the movement of the bimetallic lever 26, the actuating part 35 of the snap switch 36 is relieved, which leads to the contacts 37 and 38 being closed. But this closes the circuit, so that the voltage supplied by the voltage source 41 leads to an actuation of the signal element 42. If the signal element 42 is a glow lamp, this circuit must additionally contain a series resistor.
  • the bimetallic lever 26 remains bent by the heat emanating from the heating 12, so that the circuit with the voltage source 41 and the signal element 42 remains closed even in continuous operation. If the heater 12 is switched off, whereby the current flow through the PTC resistor 24 is also interrupted, the bimetal lever 26 remains bent due to the heat emanating from the heater 12 and the snap switch is thereby closed.
  • the housing 14 is arranged on the side edge directly next to the radiant heater 11, so that the overall height of the glass ceramic cooking surface is not increased by the temperature detector. Due to this arrangement, the bimetallic lever 26 is not only thermally closely coupled to the heating 12, but also to the glass ceramic surface itself.
  • the housing 14 can be covered by a cover to protect it from contamination.
  • the temperature detector according to the invention can of course also be used with contact radiators.
  • the auxiliary heating for the bimetallic switch can also be a normal resistor instead of a PTC resistor.
  • the temperature detector can also be used as a connection serve piece for the heating unit, or it can be installed in this connector.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Food Science & Technology (AREA)
  • Electric Stoves And Ranges (AREA)
  • Control Of Resistance Heating (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)
EP19800106438 1979-10-31 1980-10-22 Temperaturmelder zur Anzeige des Temperaturzustandes einer Glaskeramik-Kochfläche Withdrawn EP0028356A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2943922 1979-10-31
DE19792943922 DE2943922A1 (de) 1979-10-31 1979-10-31 Temperaturmelder zur anzeige des temperaturzustandes einer glaskeramik-kochflaeche

Publications (1)

Publication Number Publication Date
EP0028356A1 true EP0028356A1 (de) 1981-05-13

Family

ID=6084795

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800106438 Withdrawn EP0028356A1 (de) 1979-10-31 1980-10-22 Temperaturmelder zur Anzeige des Temperaturzustandes einer Glaskeramik-Kochfläche

Country Status (9)

Country Link
US (1) US4394646A (enExample)
EP (1) EP0028356A1 (enExample)
JP (1) JPS5673324A (enExample)
AU (1) AU534789B2 (enExample)
DE (1) DE2943922A1 (enExample)
ES (1) ES8107390A1 (enExample)
GR (1) GR70689B (enExample)
YU (1) YU278280A (enExample)
ZA (1) ZA806542B (enExample)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2499808A1 (fr) * 1981-02-10 1982-08-13 Micropore International Ltd Table de cuisson electrique munie d'un dispositif avertisseur de temperature
GB2170002A (en) * 1985-01-17 1986-07-23 Licentia Gmbh Ceramic hob
EP0203449A1 (de) * 1985-05-25 1986-12-03 E.G.O. Elektro-Geräte Blanc u. Fischer Elektrische Kochherd-Heizeinheit
EP0306435A3 (en) * 1987-09-04 1989-10-25 Emerson Electric Co. Thermostat

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ199685A (en) * 1981-02-18 1985-04-30 Micropore International Ltd Cooker element with temperature warning indication
US4551618A (en) * 1981-12-23 1985-11-05 General Electric Company Cooking appliance incorporating heater energy counter means
DE8301364U1 (enExample) * 1982-07-07 1987-06-25 E.G.O. Elektro-Geraete Blanc U. Fischer, 7519 Oberderdingen, De
DE3226264A1 (de) * 1982-07-14 1984-01-19 Ego Elektro Blanc & Fischer Temperaturbegrenzer fuer elektroheiz- oder waermegeraete, insbesondere elektrokochplatten
DE3247028A1 (de) * 1982-12-18 1984-06-20 Ego Elektro Blanc & Fischer Temperaturregeleinrichtung fuer ein waermegeraet
DE8702227U1 (de) * 1987-02-13 1988-06-16 Pistor + Boss GmbH, 5880 Lüdenscheid Restwärmeanzeigevorrichtung
FR2631117B1 (fr) * 1988-05-09 1991-04-12 Jaeger Dispositif perfectionne de mesure de temperature avec contact d'alerte
JPH07282701A (ja) * 1994-04-05 1995-10-27 Texas Instr Japan Ltd 自己保持型保護装置
IT1296831B1 (it) * 1997-12-02 1999-08-02 Guatta Andrea S P A Apparecchio per la misurazione e la segnalazione della temperatura interna di un recipiente
JP3492242B2 (ja) * 1999-06-15 2004-02-03 ユニ・チャーム株式会社 使い捨ておむつ
GB0301167D0 (en) * 2003-01-18 2003-02-19 Ceramaspeed Ltd Temperature-limiting device
WO2012046267A1 (ja) * 2010-10-05 2012-04-12 株式会社芝浦電子 加熱調理器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1123059B (de) * 1958-12-24 1962-02-01 Karl Fischer Schutzschalter fuer elektrische Kochplatten
DE2202916A1 (de) * 1971-01-26 1972-08-17 Westinghouse Electric Corp Elektrischer Kochuntersatz fuer Kochgefaesse
DE2422624A1 (de) * 1974-05-10 1975-11-13 Karl Fischer Temperaturbegrenzer
US4110601A (en) * 1975-02-18 1978-08-29 Robertshaw Controls Company Control system and method and control device therefor
DE2808181A1 (de) * 1978-02-25 1979-09-06 Imp Werke Gmbh Glaskeramik-kochfeld

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735924A (en) * 1956-02-21 Signal light for a range
US2943176A (en) * 1956-05-10 1960-06-28 Westinghouse Electric Corp Control apparatus for a heating device
US2993976A (en) * 1958-11-12 1961-07-25 Westinghouse Electric Corp Heater control
US3243792A (en) * 1963-04-08 1966-03-29 Lockheed Aircraft Corp Detection devices
DE2040523C3 (de) * 1970-08-14 1973-09-20 Danfoss A/S, Nordborg (Daenemark) Heizvorrichtung mit PTC Widerstand
US3738175A (en) * 1971-10-04 1973-06-12 U N E L E C Device for detecting the thermal overloads of a rotating member
US3711726A (en) * 1972-02-02 1973-01-16 Whirlpool Co Bimetallic signal device for appliances
DE2205132C3 (de) * 1972-02-03 1980-09-04 E.G.O. Elektro-Geraete Blanc U. Fischer, 7519 Oberderdingen Elektrokochgerät
US3898422A (en) * 1973-12-26 1975-08-05 Texas Instruments Inc PTC heater assembly bonding
US3906424A (en) * 1974-05-13 1975-09-16 Therm O Disc Inc Cooking range and control therefor
DE2627373B2 (de) * 1976-06-18 1978-10-12 E.G.O. Elektro-Geraete Blanc U. Fischer, 7519 Oberderdingen Signaleinrichtung an Kochgeräten mit einer Glaskeramikkochfläche
GB1562251A (en) * 1977-02-10 1980-03-05 Micropore Internation Ltd Electrical heating units
US4201735A (en) * 1978-09-08 1980-05-06 Fasco Industries, Inc. Method of manufacturing a choke control device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1123059B (de) * 1958-12-24 1962-02-01 Karl Fischer Schutzschalter fuer elektrische Kochplatten
DE2202916A1 (de) * 1971-01-26 1972-08-17 Westinghouse Electric Corp Elektrischer Kochuntersatz fuer Kochgefaesse
FR2123397A1 (enExample) * 1971-01-26 1972-09-08 Westinghouse Electric Corp
DE2422624A1 (de) * 1974-05-10 1975-11-13 Karl Fischer Temperaturbegrenzer
FR2270747A1 (enExample) * 1974-05-10 1975-12-05 Fischer Karl
US4110601A (en) * 1975-02-18 1978-08-29 Robertshaw Controls Company Control system and method and control device therefor
DE2808181A1 (de) * 1978-02-25 1979-09-06 Imp Werke Gmbh Glaskeramik-kochfeld

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2499808A1 (fr) * 1981-02-10 1982-08-13 Micropore International Ltd Table de cuisson electrique munie d'un dispositif avertisseur de temperature
GB2170002A (en) * 1985-01-17 1986-07-23 Licentia Gmbh Ceramic hob
EP0203449A1 (de) * 1985-05-25 1986-12-03 E.G.O. Elektro-Geräte Blanc u. Fischer Elektrische Kochherd-Heizeinheit
EP0306435A3 (en) * 1987-09-04 1989-10-25 Emerson Electric Co. Thermostat

Also Published As

Publication number Publication date
AU6377480A (en) 1981-05-07
JPS5673324A (en) 1981-06-18
ZA806542B (en) 1981-10-28
ES496401A0 (es) 1981-10-01
US4394646A (en) 1983-07-19
YU278280A (en) 1982-08-31
AU534789B2 (en) 1984-02-16
ES8107390A1 (es) 1981-10-01
GR70689B (enExample) 1982-12-20
DE2943922A1 (de) 1981-05-14

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19811002

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Inventor name: GOESSLER, GERHARD