EP0416335A1 - Interrupteur thermique - Google Patents

Interrupteur thermique Download PDF

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Publication number
EP0416335A1
EP0416335A1 EP90115626A EP90115626A EP0416335A1 EP 0416335 A1 EP0416335 A1 EP 0416335A1 EP 90115626 A EP90115626 A EP 90115626A EP 90115626 A EP90115626 A EP 90115626A EP 0416335 A1 EP0416335 A1 EP 0416335A1
Authority
EP
European Patent Office
Prior art keywords
outer tube
tube
sensor
temperature switch
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90115626A
Other languages
German (de)
English (en)
Other versions
EP0416335B1 (fr
Inventor
Gerhard Gössler
Eugen Wilde
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6388967&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0416335(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Publication of EP0416335A1 publication Critical patent/EP0416335A1/fr
Application granted granted Critical
Publication of EP0416335B1 publication Critical patent/EP0416335B1/fr
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
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0202—Switches
    • H05B1/0216—Switches actuated by the expansion of a solid element, e.g. wire or rod
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/10—Tops, e.g. hot plates; Rings
    • F24C15/102—Tops, e.g. hot plates; Rings electrically heated
    • F24C15/105—Constructive details concerning the regulation of the temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/46—Thermally-sensitive members actuated due to expansion or contraction of a solid
    • H01H37/48—Thermally-sensitive members actuated due to expansion or contraction of a solid with extensible rigid rods or tubes
    • 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
    • H05B3/742—Plates having both lamps and resistive heating elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H2037/326—Thermally-sensitive members with radiative heat transfer to the switch, e.g. special absorption surfaces

Definitions

  • the invention relates to a temperature switch according to the preamble of claim 1.
  • a temperature switch according to the preamble of claim 1 has become known.
  • Its sensor consists of a metal tube, which serves as an expansion element and which transmits its expansion to the switch via an internal rod made of material with a lower coefficient of thermal expansion.
  • This sensor is provided with a quartz tube pushed over it, which prevents the sensor from electrically bridging the air gap between the heating resistors and the heated glass ceramic plate.
  • the quartz tube is permeable to radiation and thus hardly hinders the radiation heat transfer.
  • a regulator for gas stoves has become known, in which a further metal tube is slid over the sensor tube and is at a distance from it. This tube is intended to prevent the gas flame from hitting the sensor directly.
  • a temperature switch has become known from EP-B-116 861, which lies on a web of the insulating material of the radiant heater in which it is installed and is partially shielded from it by radiation, so that a temporary response delay is brought about. This makes it possible to bring the radiant heater to a higher temperature level in the heating or boiling phase, which is then lowered to a steady state during further operation, which certainly does not damage the glass ceramic plate in continuous operation. Similar results can be found in EP-B-150 087, in which the outer tube belonging to the temperature sensor is designed as a quartz glass tube. The sensing tube is coated with an infrared reflecting material to prevent infrared radiation transmitted through the tubular member from reaching the inner rod.
  • the outer sensor tube which forms the expansion standard, consists of a material that mainly absorbs the radiation coming from the radiation source, for example a sintered ceramic material, preferably cordierite.
  • Temperature switches with such rod-shaped differential expansion rods as sensors in which the outer tube belonging to the sensor consists of a quartz material, can be built relatively thin and solve because of the good insulation properties of the quartz material the problem of puncture resistance between heating resistors and heating plates, but are relatively prone to breakage. Above all, a break or even the slightest damage at one of the ends has an immediate effect on the switching accuracy and can therefore endanger the entire device to be monitored. Furthermore, coatings on the quartz material are difficult to apply with the necessary resistance and can produce a kind of "greenhouse effect" inside the sensor, which adversely affects the control behavior.
  • the regulator type known from DE-B-25 00 586 with an internal reference standard rod and an outer expansion tube, for example made of metal.
  • the switching amplitudes of the controller are too low, so that it switches too often and exceeds the permissible "click rate", which is prescribed due to the network and radio interference.
  • the switch-off takes place earlier than desired when the appliance is first heated up. The first time it is heated, it is possible to exceed the maximum continuous temperature required for protecting the glass ceramic without endangering it, so that shorter heating times can be achieved.
  • the quartz tube is also relatively expensive and prone to breakage.
  • the object of the invention is therefore to provide a temperature limiter which avoids the disadvantages of the prior art and ensures a higher switching amplitude and an increased heating-up period, in particular in the case of a reliable, reliable construction.
  • the outer tube can consist of a technical ceramic containing magnesium silicate, possibly with a proportion of aluminum silicate, or contain this.
  • a technical ceramic containing magnesium silicate possibly with a proportion of aluminum silicate, or contain this.
  • Particularly preferred as the material is steatite, which in the sintered state not only has the advantageous reflection and absorption properties, ie is barely transparent to radiation directly, but has also been shown to be less susceptible to breakage in drop tests than a tube made of quartz material.
  • its better thermal conductivity properties contribute to an improved control behavior, in particular in the event that there are too small heat consumers (pots) or displaced pots above the heating point. In these cases, the temperature switch responds earlier than with the quartz tube, so that partial overheating on the glass ceramic can be avoided.
  • the invention therefore not only achieves an initial switching delay, but also an earlier and thus more precise response in the particularly critical case of the “displaced pot”.
  • the temperature switch for radiation heating for glass ceramics the radiation source of which contains at least one radiant heater, the heating resistor of which operates at temperatures above 1500K and is designed, for example, as a halogen lamp. Because of their intense and relatively short-wave radiation, these so-called light emitters are particularly critical to regulate in the sense of a temperature limitation for the glass ceramic plate, especially if conventional heating resistors with significantly lower annealing temperatures are used.
  • FIG. 1 shows a radiant heater 11 which is arranged under a glass ceramic plate 12 indicated in FIG. 2 and delimits a heating or cooking point thereon.
  • the radiant heater 11 is heated by a light radiator 18 and a dark radiator 20.
  • the light radiator 18 contains a high-temperature-resistant heating resistor 21, for example made of tungsten, in a quartz glass tube.
  • the quartz glass tube 24 is polygonal or essentially circular, with its two connections 22 running closely next to one another in parallel through the edge 14 out of the radiant heater and being provided with line connections there.
  • the intended annealing temperature is over 1500K, preferably 2300K.
  • the glow temperature of the dark radiator 20 is significantly below these values. It is a conventional helically bent open wire made of resistance material, which, because of its lower annealing temperature, does not require a protective gas atmosphere like the light emitter.
  • the dark radiator is designed in the form of a double-guided ring, the connections 25 of which extend on the same side of the double arc to the inner and outer turns, the two on the other side Windings are interconnected by an arc 26.
  • a connector 38 for the dark radiator connections is inserted into the edge of the carrier shell 16.
  • a rod-shaped temperature sensor 27 of a temperature switch 28 protrudes diametrically over the circular radiant heater and is guided in the edge 14 on both sides.
  • the switch head 40 of the temperature switch 28 lies outside the remaining radiant heater limitation. It contains two switch contacts 41, 42, which are indicated in FIG. 1. One serves to limit the temperature and the other serves as a signal contact for reporting the hot state of the hotplate.
  • the temperature sensor 27 projects through the bowl-shaped interior of the radiant heater at a distance from the underside of the glass ceramic plate 12 and the radiators 18, 20.
  • the two emitters 18, 20 forming the radiation source form two rings which are essentially concentric with one another, of which the light emitter 18 forms the inner one.
  • the temperature sensor 27 of the temperature switch 28 consists of a metallic sensor tube 43 and a rod 44 located therein made of a material with a lower coefficient of thermal expansion than the sensor tube 43, for example a ceramic rod.
  • the sensor tube is fastened in the housing of the switch head 40, while the rod 44 acts directly or indirectly on the switch contact (s) 41, 42.
  • the rod 44 is supported on an adjusting screw (not shown) used there, which can be adjusted in a thread of the sensor tube.
  • the sensor tube 43 is surrounded by an outer tube 45 which has a slightly larger inner diameter than the outer diameter of the sensor tube, so that a gap 50 is formed between it and the sensor tube.
  • the outer tube 45 lies under gravity on the sensor tube, so that the gap 50 is formed in particular in the lower region.
  • the outer tube can lead axially within the edge 14 if the holes 46 in the edge 14, through which the sensor 27 is inserted for its positioning and guidance, are smaller than the outer diameter of the outer tube 45.
  • the outer tube which here over the entire Radiant heater diameter goes through in one piece, especially in the areas in which the exposed radiation sources, such as the heating coil 20, should not have a gap through which an electrically conductive bridge to the glass ceramic plate is formed.
  • the outer tube 45 is guided in a countersunk hole 48 in the edge near the free end of the sensor, so that the outer tube extends somewhat into the edge and there is no gap.
  • the outer tube also protrudes into an enlarged bore 49 of the edge, which, like the holes 46, 48, can also be formed as U-shaped recesses that are open toward the top of the edge.
  • the outer tube 45 is supported on this and positions it so elastically that it is pressed against the shoulder between the bores 46 and 48. As a result, the outer tube is guided elastically, so that it is much less likely to break than if it were freely movable.
  • the outer tube 45 is made of steatite. This material from the KER 200 group in accordance with DIN 40685 (ceramic insulating materials for electrical engineering) has proven particularly useful. Steatite is a product containing magnesium silicate, which is particularly dense and is good before firing by casting, turning, extrusion, pressing or the like. can be processed so that a relatively thin-walled tube of greater length can be produced.
  • the outer tube 45 has an outer diameter of 7 mm with a wall thickness of approximately 0.8 mm. After firing, the material is mechanically very strong, has a very high dielectric strength and, above all, has a much higher flexural strength than quartz.
  • a particularly advantageous property in this connection is the fact that the material has a high specific heat with a relatively high bulk density, so that the thermal inertia, which the pipe conveys on account of its heat storage capacity, is large. Particularly important is the fact that it is not transparent and because of its mostly light color reflects a large part of the radiation, while the other part is absorbed and then only emitted to the actual sensor tube 43 by secondary radiation, heat conduction or convection, which with some Delay happens.
  • the thermal conductivity is also higher than that of the quartz material, so that the outer tube helps to distribute the heat over the length of the probe and thus to achieve an earlier response in the "displaced pot" situation described.
  • the radiation sources 18, 20 After the radiation sources 18, 20 are switched on, they heat up quickly, in particular the light emitter 18, and the radiation is directed onto the glass ceramic plate 12, which allows part of the radiation to pass through, but converts a large part.
  • the glass ceramic plate heats up considerably, and the critical temperature on the underside would be reached relatively quickly, in the order of 900 to 1000 K, at which the glass ceramic would suffer permanent damage if it were operated at this temperature for a long time.
  • the temperature limiter is provided, which is set to switch off the radiant heating elements or to reduce their output when the temperature approaches the critical temperature of the glass ceramic plate, in addition to actuating a hot indicator which responds at temperatures around 300K.
  • the radiation is shielded by the outer tube 45, partly absorbed and partly reflected.
  • the gap 50 of, for example, 0.5 to 0.8 mm is formed between the sensor tube 43 and the outer tube 45 primarily on the lower side, where the radiation impinges, so that there is an intermediate insulation gap.
  • the heat can therefore only be transmitted by secondary radiation or by heat transfer in the gap 50, while contact transfer is only present in the upper section where the outer tube rests on the sensor tube. Until then, however, the heat must be conducted by conduction around half the circumference of the outer tube. There is therefore a considerable delay in response, which allows the temperature on the underside of the glass ceramic to exceed somewhat above the permanent limit value, which has turned out to be permissible and the parboiling times are significantly reduced.
  • the one-sided gap formation which is established by gravity in a heating element arranged under the heated plate, but can also be achieved by other measures in a different arrangement, also has the effect that, due to the better heat transfer from the heated plate, its retroreflection increases affects.
  • the delay caused by all factors, such as shielding, thermal mass, etc. has the effect that the switching amplitude can be increased by almost a power of ten and the switching intervals can thus be reduced to an acceptable level.
  • the switching amplitude could be increased from +/- 1.5K with a quartz tube to +/- 11k with a steatite outer tube as the outer tube.
  • the outer tube 45 naturally has the desired effect that the necessary air gap between the glass ceramic, which conducts at higher temperatures, and the radiant heaters, in particular the exposed radiant heaters, is not bridged. This is also important because if the glass ceramic and / or an encapsulated radiation source, such as the light emitter 18, breaks, no electrically conductive bridge is created, but on the contrary, additional security against contact is created.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Thermally Actuated Switches (AREA)
  • Optical Measuring Cells (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Switches With Compound Operations (AREA)
  • Radiation Pyrometers (AREA)
EP90115626A 1989-09-08 1990-08-16 Interrupteur thermique Expired - Lifetime EP0416335B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3929965 1989-09-08
DE3929965A DE3929965A1 (de) 1989-09-08 1989-09-08 Temperaturschalter

Publications (2)

Publication Number Publication Date
EP0416335A1 true EP0416335A1 (fr) 1991-03-13
EP0416335B1 EP0416335B1 (fr) 1995-07-12

Family

ID=6388967

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90115626A Expired - Lifetime EP0416335B1 (fr) 1989-09-08 1990-08-16 Interrupteur thermique

Country Status (6)

Country Link
US (1) US5113170A (fr)
EP (1) EP0416335B1 (fr)
JP (1) JPH03205725A (fr)
AT (1) ATE125097T1 (fr)
DE (2) DE3929965A1 (fr)
ES (1) ES2074503T3 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0544244A2 (fr) * 1991-11-26 1993-06-02 E.G.O. Elektro-Geräte Blanc und Fischer GmbH & Co. KG Dispositif pour détecter la température
GB2333430A (en) * 1998-01-14 1999-07-21 Ceramaspeed Ltd Electric heating lamp design
DE102004023787A1 (de) * 2004-05-07 2005-12-01 E.G.O. Elektro-Gerätebau GmbH Heizeinrichtung für ein Kochfeld mit einer elektrischen Anschlusseinrichtung, elektrische Anschlusseinrichtung für eine solche Heizeinrichtung sowie Verfahren zum Anschliessen einer Anschlusseinrichtung an einer Heizeinrichtung
EP1791395A2 (fr) 2005-11-25 2007-05-30 E.G.O. ELEKTRO-GERÄTEBAU GmbH Dispositf de détection de température pour ensemble de chauffage ainsi que sa méthode de commande d'ensemble chauffant

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4138814C2 (de) * 1991-11-26 2002-08-01 Ego Elektro Geraetebau Gmbh Temperatur-Schaltgerät
US5397873A (en) * 1993-08-23 1995-03-14 Emerson Electric Co. Electric hot plate with direct contact P.T.C. sensor
AT405566B (de) * 1996-07-30 1999-09-27 Electrovac Temperaturbegrenzer mit zündelement
DE29702219U1 (de) * 1997-02-10 1997-06-19 B E E M Blitz-Elektro-Erzeugnisse Manufaktur Handels-GmbH, 61191 Rosbach Gerätesteckverbindung
GB2325533B (en) * 1997-05-22 2001-08-08 Ceramaspeed Ltd Method and apparatus for controlling an electric heater
GB2373582A (en) * 2001-03-20 2002-09-25 Ceramaspeed Ltd Temperature sensing probe assembly
GB0301164D0 (en) * 2003-01-18 2003-02-19 Ceramaspeed Ltd Temperature-responsive device
AT412521B (de) * 2003-03-10 2005-03-25 Electrovac Temperaturfühler
US11098923B2 (en) * 2016-03-31 2021-08-24 Gd Midea Environment Appliances Mfg Co., Ltd. Electric radiator
US11143413B2 (en) * 2017-12-05 2021-10-12 Zhejiang Jiu Kang Electric Appliances Co., Ltd. Glass-ceramic cooking apparatus and a method relating to temperature limiting control for preventing cooking oil ignition

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2839161A1 (de) * 1978-09-08 1980-03-20 Ego Regeltech Temperaturbegrenzer fuer eine glaskeramik-kocheinheit
FR2435796A3 (fr) * 1978-09-07 1980-04-04 Ego Elektro Blanc & Fischer Regulateur de temperature pour des plaques de cuisson en vitroceramique chauffees au gaz
GB2172749A (en) * 1985-03-18 1986-09-24 Cotherm Sa Thermostat
EP0348716A2 (fr) * 1988-06-25 1990-01-03 E.G.O. Elektro-Geräte Blanc und Fischer GmbH & Co. KG Commutateur thermique

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE735491C (de) * 1937-10-14 1943-05-15 Theodor Stiebel Dipl Ing Dr Temperaturregler elektrisch beheizter Heisswasserspeicher
DE2500586A1 (de) * 1975-01-09 1976-07-15 Ego Elektro Blanc & Fischer Elektrokochgeraet
GB2069300B (en) * 1980-02-01 1983-09-01 Mictropore International Ltd Radiant heating elements for smooth top cookers
DE3302489A1 (de) * 1983-01-26 1984-07-26 Ego Elektro Blanc & Fischer Elektrischer strahlheizkoerper zur beheizung von koch- oder waermeplatten, insbesondere glaskeramikplatten
GB8324271D0 (en) * 1983-09-10 1983-10-12 Micropore International Ltd Thermal cut-out device
GB8401621D0 (en) * 1984-01-21 1984-02-22 Thorn Emi Domestic Appliances Thermal limiter
DE3821496A1 (de) * 1988-06-25 1989-12-28 Ego Elektro Blanc & Fischer Temperaturschalter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2435796A3 (fr) * 1978-09-07 1980-04-04 Ego Elektro Blanc & Fischer Regulateur de temperature pour des plaques de cuisson en vitroceramique chauffees au gaz
DE2839161A1 (de) * 1978-09-08 1980-03-20 Ego Regeltech Temperaturbegrenzer fuer eine glaskeramik-kocheinheit
GB2172749A (en) * 1985-03-18 1986-09-24 Cotherm Sa Thermostat
EP0348716A2 (fr) * 1988-06-25 1990-01-03 E.G.O. Elektro-Geräte Blanc und Fischer GmbH & Co. KG Commutateur thermique

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0544244A2 (fr) * 1991-11-26 1993-06-02 E.G.O. Elektro-Geräte Blanc und Fischer GmbH & Co. KG Dispositif pour détecter la température
EP0544244A3 (fr) * 1991-11-26 1994-01-12 Ego Elektro Blanc & Fischer
TR26583A (tr) * 1991-11-26 1995-03-15 Ego Elektro Blanc & Fischer TEMPERATüR ALGILAMA CIHAZI
US5420398A (en) * 1991-11-26 1995-05-30 E.G.O. Elektro-Gerate Blanc U. Fischer Temperature detection device
GB2333430A (en) * 1998-01-14 1999-07-21 Ceramaspeed Ltd Electric heating lamp design
GB2333430B (en) * 1998-01-14 2001-11-07 Ceramaspeed Ltd Electric heater
DE102004023787A1 (de) * 2004-05-07 2005-12-01 E.G.O. Elektro-Gerätebau GmbH Heizeinrichtung für ein Kochfeld mit einer elektrischen Anschlusseinrichtung, elektrische Anschlusseinrichtung für eine solche Heizeinrichtung sowie Verfahren zum Anschliessen einer Anschlusseinrichtung an einer Heizeinrichtung
DE102004023787B4 (de) * 2004-05-07 2008-10-02 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Anschließen einer Anschlusseinrichtung an einer Heizeinrichtung
DE102004023787C5 (de) * 2004-05-07 2016-04-07 E.G.O. Elektro-Gerätebau GmbH Verfahren zum Anschließen einer Anschlusseinrichtung an einer Heizeinrichtung
EP1791395A2 (fr) 2005-11-25 2007-05-30 E.G.O. ELEKTRO-GERÄTEBAU GmbH Dispositf de détection de température pour ensemble de chauffage ainsi que sa méthode de commande d'ensemble chauffant

Also Published As

Publication number Publication date
DE3929965A1 (de) 1991-03-14
US5113170A (en) 1992-05-12
EP0416335B1 (fr) 1995-07-12
ES2074503T3 (es) 1995-09-16
ATE125097T1 (de) 1995-07-15
DE59009395D1 (de) 1995-08-17
JPH03205725A (ja) 1991-09-09

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