EP0348716A2 - Commutateur thermique - Google Patents

Commutateur thermique Download PDF

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Publication number
EP0348716A2
EP0348716A2 EP89110509A EP89110509A EP0348716A2 EP 0348716 A2 EP0348716 A2 EP 0348716A2 EP 89110509 A EP89110509 A EP 89110509A EP 89110509 A EP89110509 A EP 89110509A EP 0348716 A2 EP0348716 A2 EP 0348716A2
Authority
EP
European Patent Office
Prior art keywords
radiation
temperature switch
tube
temperature
switch 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.)
Granted
Application number
EP89110509A
Other languages
German (de)
English (en)
Other versions
EP0348716A3 (fr
EP0348716B1 (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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25869461&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0348716(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE19883821495 external-priority patent/DE3821495A1/de
Priority claimed from DE19883821496 external-priority patent/DE3821496A1/de
Application filed by EGO Elektro Gerate Blanc und Fischer GmbH filed Critical EGO Elektro Gerate Blanc und Fischer GmbH
Publication of EP0348716A2 publication Critical patent/EP0348716A2/fr
Publication of EP0348716A3 publication Critical patent/EP0348716A3/fr
Application granted granted Critical
Publication of EP0348716B1 publication Critical patent/EP0348716B1/fr
Anticipated expiration legal-status Critical
Revoked 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
    • 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
    • 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

Definitions

  • the invention relates to a temperature switch according to the preamble of claim 1.
  • EP-B-116 861 describes a temperature switch of this type in which a web made of the insulating material of the radiant heater in which it is installed causes radiation shielding and thus a temporary delay in response. 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.
  • EP-B-150 087 discloses a temperature switch for heating a glass ceramic plate, in which a quartz glass tube is used which selectively only absorbs radiation with a wavelength which is reflected back from the glass ceramic plate in order to respond to the temperature switch to the temperature of the glass ceramic plate allow. The radiation coming from the radiation source should be let through. This means that a temporary response delay cannot be achieved.
  • the object of the invention is to provide a temperature switch which avoids the disadvantages of the prior art and is particularly simple and effective.
  • the tube preferably at least partially comprises or consists of a radiation-absorbing material
  • the radiation-absorbing material primarily absorbs and absorbs the radiation from the radiant heater. So initially it does not come to the expansion rod. However, the tube heats up and in turn emits heat, albeit with a delay, to the expansion rod due to its own radiation and convection. Since the material of the tube has a lower, but not completely negligible expansion coefficient than the expansion rod, the increased initial heating of the tube compared to the expansion rod also has a certain countercompensating effect sation, which increases the delay effect. In further operation, the switching amplitude, which is very low as a result of the very sensitive switch basic characteristic, is increased as desired and thus the switching frequency is reduced.
  • This retarding effect can be dimensioned as desired in that the tube either completely or partially has the radiation-absorbing material. This could be designed as a coating, for example. However, the tube itself is preferably made of radiation-absorbing material.
  • the retarding effect is further improved if the tube has an increased thermal inertia. This means that it has an increased mass and / or specific heat, so that the radiant heat is stored before it is passed on to the expansion rod. After the heating element has been switched off, this heat still acts on the expansion rod and delays its cooling. A low thermal conductivity of the pipe material also contributes to this.
  • the tube preferably consists of a sintered ceramic material, for example of cordierite, which has excellent radiation absorption properties with low reflection values.
  • the tube from a glass ceramic, in particular with low transmission properties.
  • Low transmission properties can be created by adding a metal oxide.
  • Manufacture from radiation-absorbing, non-transmissive quartz has also proven successful.
  • the expansion rod consists at least partially of a chromium-iron-aluminum alloy which is heat-treated at a temperature above 800 ° C (approx. 1100 K), preferably above 1100 ° C (approx. 1400 K)
  • the switching amplitude has increased significantly, for example from ⁇ 2 K to ⁇ 5.5 K.
  • the chromium-iron-aluminum alloy which preferably contains approximately 22% chromium and approximately 5% aluminum, is available under the name "Kanthal A, Al, AF" from the company AB Kanthal, Sweden, and was previously used as electrical Resistor material used. In conjunction with the heat treatment, it causes the specified values of the thermal delay or increase in the switching amplitude.
  • the temperature switch can be used particularly advantageously in the case of a radiant heating element having at least one high-temperature radiant heater, for example a heating resistor enclosed by a lamp bulb. Because of its fast response, the switching amplitude could otherwise become very small and thus result in an increased switching frequency, which would be impermissible, above all because of the high starting currents of such high-temperature radiant heaters.
  • the temporary response delay effect can be dimensioned such that it allows a brief initial overheating of the glass ceramic plate, which due to its short duration does not cause any damage, but it can also be dimensioned so that it delays the heating of the glass ceramic plate, which is present anyway due to the higher mass of the glass ceramic plate compensated.
  • the drawing shows a schematic representation of a radiant heater 11, which is arranged below a glass ceramic plate 12 and heats it.
  • a carrier shell 33 there is insulation 42.
  • Heating resistors 13 or 14 are provided in the form of a heating coil 13 partially embedded in the insulation 42 and in the form of a high-temperature radiant heater 14, which is, for example, a halogen lamp, the heating coil 15 of which is made of tungsten or similar materials is contained in a quartz lamp body 16 and, due to temperatures above 1500 K, has a radiation spectrum largely in the visible range.
  • a temperature sensor 20 of a temperature switch 21 projects through edges 17 of the insulation 12 reaching as far as the glass ceramic plate 12 and projects between the glass ceramic plate 12 and the radiators 13, 14 across the radiant heater.
  • the temperature switch 21 is a fixed, but adjustable temperature limiter, the switching mechanism indicated as a snap switch 22 switches off the radiators 13 and / or 14 or in another way reduces their output when the limiting temperature is reached.
  • the temperature switch 21 can also open a second one have a different temperature-adjusted switching mechanism that can be used, for example, to display the hot state of the glass ceramic plate.
  • the switching mechanism 22 and possibly the further switching mechanism are actuated by an expansion rod 24. It is arranged in a tube 25, which consists of a material that has a substantially lower coefficient of thermal expansion than the expansion rod 24.
  • the expansion rod 24 is loaded by a spring 26 engaging a thickened head 30 of the expansion rod 24 in the switch head 27 of the temperature switch 21 lying outside the heated area of the radiant heater in the direction of the snap switch, so that it has one at its free end on a thread 28 arranged adjusting nut 29 against the end of the tube 25 and thus the tube also pulls against the switch head.
  • This so-called tension rod arrangement in which the tension rod is the thermally active part, enables a relatively simple assembly because the temperature sensor is held in a force-fitting manner by the spring itself and, despite some flexibility in the attachment, the adjustment accuracy does not suffer.
  • the expansion rod 24 consists of a chromium-iron-aluminum alloy, which preferably contains approximately 22% chromium and 5% aluminum and which is manufactured by AB Kanthal, Sweden, under the name Kanthal A or Al or AF as a heating conductor. Alloy is produced.
  • the rod made of this material after being provided with a head 30 for the engagement of the spring 26 and the thread 28, is subjected to a pre-aging in a temperature above 800 ° C, preferably at about 1200 ° C in a normal atmosphere. This also reduces the stress caused by the mechanical deformation. This surprisingly increases the switching amplitude by approximately ⁇ 3 K.
  • This material is a glass ceramic with low transmission and high radiation absorption, which is achieved by adding a metal oxide.
  • a tube 25 made of opaque quartz was successfully examined, for example from the material 'Rotosil' from Heraeus.
  • the impermeability to radiation and absorption capacity were achieved by adding metal oxides.
  • the switching amplitude should be of the order of magnitude between 4 and 10 K (preferably 5 to 7 K) in order to achieve a switching frequency that is less than 5 switching operations per minute. Otherwise, the maximum number of operations per minute specified by local regulations (due to network or radio interference) could be exceeded.
  • the radiation-absorbing design of the tube 25 is particularly advantageous when the thermal mass is increased. This can be done by substantially exceeding the usual wall thickness of 1 mm for pipes of this type and preferably up to 3 mm. It would also be possible to provide other heat-storing means on the pipe. It is also conceivable to provide the radiation-absorbing properties in a surface coating, while the tube has heat-storing properties. By using a pipe material with low thermal conductivity, the heat transfer from the pipe to the expansion rod can be hindered, which would also be achievable through intermediate insulation measures.
  • the radiation-absorbing material used on the tube is preferably radiation-absorbing in the entire wavelength range which is essential for the radiation heating, in particular in the area which comes directly from the respective radiation source, so that the response behavior is mainly from the heating and not from secondary radiators, e.g. the glass ceramic plate. This characteristic is guaranteed for the materials described, but can also be achieved with other materials.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Thermally Actuated Switches (AREA)
  • Electric Stoves And Ranges (AREA)
  • Glass Compositions (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Switches With Compound Operations (AREA)
EP89110509A 1988-06-25 1989-06-10 Commutateur thermique Revoked EP0348716B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19883821495 DE3821495A1 (de) 1988-06-25 1988-06-25 Temperaturschalter
DE3821496 1988-06-25
DE3821495 1988-06-25
DE19883821496 DE3821496A1 (de) 1988-06-25 1988-06-25 Temperaturschalter

Publications (3)

Publication Number Publication Date
EP0348716A2 true EP0348716A2 (fr) 1990-01-03
EP0348716A3 EP0348716A3 (fr) 1991-04-03
EP0348716B1 EP0348716B1 (fr) 1995-02-01

Family

ID=25869461

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89110509A Revoked EP0348716B1 (fr) 1988-06-25 1989-06-10 Commutateur thermique

Country Status (5)

Country Link
US (1) US5055819A (fr)
EP (1) EP0348716B1 (fr)
AT (1) ATE118144T1 (fr)
DE (1) DE58908957D1 (fr)
ES (1) ES2066805T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0416335A1 (fr) * 1989-09-08 1991-03-13 E.G.O. Elektro-Geräte Blanc und Fischer GmbH & Co. KG Interrupteur thermique

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5256860A (en) * 1993-01-22 1993-10-26 Therm-O-Disc, Incorporated Control for glass cooktops utilizing rod-shaped thermistor
IT240975Y1 (it) * 1996-10-25 2001-04-20 Whirpool Europ S R L Dispositivo di controllo della temperatura e di sicurezza associatoa un elemento riscaldante di un piano di cottura in vetroceramica
DE19846513A1 (de) * 1998-10-09 2000-04-13 Ego Elektro Geraetebau Gmbh Schalteinrichtung für eine elektrische Heizeinrichtung
ES2291291T3 (es) * 2001-01-10 2008-03-01 Electrovac Ag Limitador de temperatura.
AT409680B (de) * 2001-04-17 2002-10-25 Electrovac Temperaturbegrenzer
DE102018213625A1 (de) * 2018-08-13 2020-02-13 Siemens Aktiengesellschaft Schaltanlagentemperaturmessung

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926648A (en) * 1974-06-07 1975-12-16 Corning Glass Works Sintered cordierite glass-ceramic bodies
DE2839161A1 (de) * 1978-09-08 1980-03-20 Ego Regeltech Temperaturbegrenzer fuer eine glaskeramik-kocheinheit
GB8324271D0 (en) * 1983-09-10 1983-10-12 Micropore International Ltd Thermal cut-out device
GB2192279B (en) * 1983-09-10 1988-10-26 Micropore International Ltd Thermal cut-out device for radiant heaters
AT385372B (de) * 1983-11-04 1988-03-25 Electrovac Vorrichtung zur regelung bzw. begrenzung wenigstens einer temperatur von strahlungsbzw. kontaktheizkoerpern von elektrischen kochgeraeten
IE55689B1 (en) * 1983-12-01 1990-12-19 Thorn Emi Patents Ltd Thermal limiter
EP0176027B1 (fr) * 1984-09-22 1989-02-01 E.G.O. Elektro-Geräte Blanc u. Fischer Elément chauffant à rayons pour appareils de cuisson
DE3817113A1 (de) * 1988-05-19 1989-11-30 Ego Elektro Blanc & Fischer Strahlheizkoerper

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0416335A1 (fr) * 1989-09-08 1991-03-13 E.G.O. Elektro-Geräte Blanc und Fischer GmbH & Co. KG Interrupteur thermique
US5113170A (en) * 1989-09-08 1992-05-12 E.G.O. Elektro-Gerate Blanc U. Fischer Temperature switch

Also Published As

Publication number Publication date
EP0348716A3 (fr) 1991-04-03
ES2066805T3 (es) 1995-03-16
ATE118144T1 (de) 1995-02-15
DE58908957D1 (de) 1995-03-16
US5055819A (en) 1991-10-08
EP0348716B1 (fr) 1995-02-01

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