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EP1458003B1 - Capteur de température - Google Patents

Capteur de température Download PDF

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Publication number
EP1458003B1
EP1458003B1 EP04450054A EP04450054A EP1458003B1 EP 1458003 B1 EP1458003 B1 EP 1458003B1 EP 04450054 A EP04450054 A EP 04450054A EP 04450054 A EP04450054 A EP 04450054A EP 1458003 B1 EP1458003 B1 EP 1458003B1
Authority
EP
European Patent Office
Prior art keywords
housing
rod
switch
temperature sensor
coefficient
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
EP04450054A
Other languages
German (de)
English (en)
Other versions
EP1458003A1 (fr
Inventor
Dr. Paul Losbichler
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.)
Electrovac AG
Original Assignee
Electrovac AG
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 Electrovac AG filed Critical Electrovac AG
Priority to PL04450054T priority Critical patent/PL1458003T3/pl
Priority to AT04450054T priority patent/ATE329364T1/de
Publication of EP1458003A1 publication Critical patent/EP1458003A1/fr
Application granted granted Critical
Publication of EP1458003B1 publication Critical patent/EP1458003B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/10—Compensation for variation of ambient temperature or pressure
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/12—Means for adjustment of "on" or "off" operating temperature
    • H01H37/20—Means for adjustment of "on" or "off" operating temperature by varying the position of the thermal element in relation to switch base or casing
    • 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

Definitions

  • the invention relates to a temperature sensor according to the preamble of claim 1.
  • Such a temperature sensor is e.g. in EP 0 141 923 B.
  • an upstanding from the bottom of the pot circumferential rib is provided which separates two separately controllable heating coils.
  • the tube of the temperature sensor extends over both heating coils away, but in this a three-piece rod is held, whose central part extends only over the region of the central heating coil.
  • the two outer parts of the rod, which abut with their end faces on the central part of the rod, have a coefficient of thermal expansion which corresponds at least to that of the surrounding tube, which is integrally formed, whereas the central part of the rod is smaller than that of surrounding pipe.
  • the outer parts of the rod have a coefficient of expansion which is at most as large as that of the surrounding tube, but preferably smaller.
  • the tube is also formed in three parts, wherein the parts of the tube substantially coincide with those of the rod.
  • the central portion of the tube has a greater coefficient of thermal expansion than the outer portions of the tube and the outer portions of the rod have a greater coefficient of thermal expansion than the central portion of the rod.
  • the outer portions, or parts of the tube and the rod are arranged in the region of the outer heating coil. Also in this case, it comes to compensate for the influence of the switchable outer heating coil.
  • the aim of the invention is to avoid this disadvantage and to propose a temperature sensor of the type mentioned, in which a stronger overshoot of the desired response temperature is avoided in a cold switch housing.
  • a further problem is that the heat generated in a pot receiving a heating coil passes through the wall of the pot into the heating space of a cooking range accommodating this pot, whereby it heats up.
  • the boiler room temperature, or the wall tem- perature of a cooking range which is in a dependency relationship with it, must not exceed a certain value.
  • Reference numeral 1 denotes a radiant heater which comprises a pot 2 in which there is a spirally wound heating coil 3 embedded in an embedding compound 4.
  • the radiant heater 1 is below a plate 5 made of metal, glass ceramic, od. The like.
  • a temperature sensor 7 is arranged, which is in communication with a switch button 18, which latter is not shown.
  • the temperature sensor is passed through holes in the substantially cylindrical wall of the radiant heater 1, and its pot 2 in a simple manner.
  • the temperature sensor 7 is thus exposed to the temperature prevailing below the cooking surface 6 in the radiation space between the cooking surface 6, or the supporting plate 5 and the heating coil 3 and thus can detect this temperature.
  • the structural design of the temperature sensor 7 is shown in FIG. 3.
  • the temperature sensor 7 comprises an outer tube 8 made of a material having a relatively high coefficient of thermal expansion, such as e.g. of a metal, in particular steel, a two-part rod 9 held in its interior, the two parts of which are designated L1 and L2, and a switch 18 held in a housing 10, to the movable switching contact 11 of which is biased against its open position, the rod 9 rests with its part L2, which extends into the housing 10 of the switch 8.
  • the fixed contacts of the switch 18 are denoted by 12 and connected to discharges 13.
  • the one end of the tube 8, which may have any cross-section is completed, and this can also be done by an optionally adjustable holder (not shown) for the rod 9, or its part L1.
  • an optionally adjustable holder (not shown) for the rod 9, or its part L1.
  • the part L1 of the rod 9 extends over the region of the radiant heater 1, over which the heating coil 3 extends.
  • the second part L2 of the rod 9 is located in the region of the wall of the pot 2, which is made of a poor thermal conductivity material, in the region of this wall at the front of the part L1 of the rod and extends into the housing 10 of the switch 18, the is outside of the radiant heater 1, but in the boiler room of a cooker, which is not shown in detail, is arranged, whereby the housing 10 is exposed to the temperature prevailing in the boiler room of the cooker.
  • the tube 8 of the temperature sensor 7 is fixedly connected to the housing 10 of the switch 18.
  • the temperature sensor When the heating coil 3 is switched on, the temperature sensor is exposed to the heat radiation of the heating coil or to the temperature prevailing in the radiant heater 1 between the heating coil 3 and the plate 5.
  • the tube 8 which has a considerably larger coefficient of thermal expansion than the part L1 of the rod 9, expands more than the rod part L1, whereby the pressure on the movable contact 11 decreases.
  • it is possible to move the contact 11 due to its bias in its open position and to interrupt the circuit to the heating coil 3.
  • the result is a substantially complete compensation of the thermal expansion of the housing 10 and thus a substantially complete compensation of the influence of the heating of the housing 10 due to the diffusing through the wall of the pot 2 heat.
  • the rod member L1 has a larger coefficient of thermal expansion than the tube 8 and the above-mentioned products must be reversed in such a case to achieve the same effect in terms of kinematic reversal.
  • the two parts L1, L2 of the rod 9 have different heat absorption coefficients, wherein the part L2 of the rod 9 preferably has a lower heat absorption coefficient.
  • the lower heat absorption coefficient causes a lower heat absorption or heating of the rod 9, which is why the temperature equilibrium state with the housing is reached later.
  • the switching temperature when switching on the heater i. in the case of a cold housing of the radiant heater, is higher than the switching temperature in the temperature equilibrium state. Therefore, when switching on when the housing is cold, the temperature sensor overshoots. As a result, the cooking performance can be optimized, which means that when the heater is switched on in the cold state, a higher glass transition temperature is available, which reduces the time required to reach the cooking temperature.
  • the heat absorption coefficient can be adjusted by different colors, different surface design, such as by attaching profilings or different surface roughness and the like. be, or else by different Metallismeengept, such as Al 2 O 3 .

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Electric Stoves And Ranges (AREA)
  • Measuring Fluid Pressure (AREA)
  • Glass Compositions (AREA)
  • Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
  • Surgical Instruments (AREA)
  • Control Of Resistance Heating (AREA)
  • Resistance Heating (AREA)

Claims (7)

  1. Sonde de température (7) pour radiateur rayonnant (1), notamment dans une cuisinière, lequel radiateur rayonnant (1) est sensiblement formé par un filament chauffant (3) placé dans un pot (2), lequel radiateur (1) est disposé dans une enceinte de chauffe recouverte vers le haut par une plaque vitrocéramique ou une plaque en acier (5) comportant une surface de cuisson (6), la sonde de température (7) comportant un tube (8) qui s'étend à travers la cavité du pot (2) sensiblement parallèlement à la plaque (5) recouvrant celui-ci et traverse au moins une paroi thermiquement isolante du pot (2) et dont une extrémité est reliée à un boîtier (10) d'un commutateur (18) comportant au moins un contact de commutation (11) mobile coopérant avec des contacts (12) fixes retenus dans le boîtier (10), une tige (9) constituée par au moins deux parties étant retenue par une de ses extrémités à l'intérieur de ce tube (8) fermé à sa deuxième extrémité, laquelle tige (9) s'étend dans le boîtier (10) du commutateur (18) et actionne le contact de commutation (11), le tube (8) et la tige (9) constituée par au moins deux parties ayant des coefficients de dilatation thermique différents, caractérisée en ce que la partie (L2) de la tige (9) qui s'étend à l'intérieur du boîtier (10) du commutateur (18) se termine en dehors de la cavité du pot (2) et que le produit du coefficient de dilatation thermique de la partie (L2) de la tige (9) faisant saillie dans le boîtier (10) du commutateur (18) par sa dimension axiale est choisi en fonction du produit du coefficient de dilatation thermique du boîtier (10) du commutateur (18) par sa dimension suivant la direction de la tige (9) jusqu'aux fixations des contacts fixes (12) du commutateur (18) de manière à éviter, en grande partie ou totalement, le déplacement du point de commutation du commutateur du fait de la dilatation thermique du boîtier du commutateur.
  2. Sonde de température selon la revendication 1, caractérisée en ce que le produit du coefficient de dilatation thermique de la partie (L2) de la tige (9) faisant saillie dans le boîtier (10) du commutateur (18) par sa dimension axiale est inférieur au produit du coefficient de dilatation thermique du boîtier (10) du commutateur (18) par la dimension du boîtier (10) suivant la direction de la tige (9) jusqu'aux fixations des contacts fixes (12).
  3. Sonde de température selon la revendication 1, caractérisée en ce que le produit du coefficient de dilatation thermique du boîtier (10) du commutateur (18) par la dimension du boîtier (10) suivant la direction de la tige (9) jusqu'aux fixations des contacts fixes (12) et le produit du coefficient de dilatation thermique de la partie (L2) de la tige (9) faisant saillie dans le boîtier (10) par sa dimension axiale sont sensiblement égaux, le boîtier (10) et la partie (L2) de la tige (9) faisant saillie dans celui-ci étant de préférence réalisés dans le même matériau et la dimension de cette partie (L2) de la tige (9) étant sensiblement égale à la dimension du boîtier (10) suivant la direction axiale de la tige (9) jusqu'aux fixations des contacts fixes (12).
  4. Sonde de température selon l'une quelconque des revendications 1 à 3, caractérisée en ce que les deux parties (L1, L2) de la tige (9) ont un coefficient d'absorption thermique ε différent.
  5. Sonde de température selon la revendication 4, caractérisée en ce que l'on adapte le coefficient d'absorption thermique en donnant aux surfaces un certain aspect, p.ex. en leur donnant une couleur et/ou en prenant des mesures influant sur l'étendue de la surface, par exemple en donnant à la section transversale un certain profil ou en ajustant la rugosité de la surface.
  6. Sonde de température selon la revendication 4 ou 5, caractérisée en ce que l'on adapte le coefficient d'absorption thermique par incorporation de métal, p. ex. d'Al2O3.
  7. Sonde de température selon l'une quelconque des revendications 4 à 6, caractérisée en ce que l'on fait coïncider le coefficient d'absorption thermique de la partie (L2) de la tige (9) qui s'étend à l'intérieur du boîtier (10) du commutateur (18) avec le coefficient correspondant du boîtier (10).
EP04450054A 2003-03-10 2004-03-08 Capteur de température Expired - Lifetime EP1458003B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL04450054T PL1458003T3 (pl) 2003-03-10 2004-03-08 Czujnik temparatury
AT04450054T ATE329364T1 (de) 2003-03-10 2004-03-08 Temperaturfühler

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0036203A AT412521B (de) 2003-03-10 2003-03-10 Temperaturfühler
AT3622003 2003-03-10

Publications (2)

Publication Number Publication Date
EP1458003A1 EP1458003A1 (fr) 2004-09-15
EP1458003B1 true EP1458003B1 (fr) 2006-06-07

Family

ID=32739107

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04450054A Expired - Lifetime EP1458003B1 (fr) 2003-03-10 2004-03-08 Capteur de température

Country Status (5)

Country Link
US (1) US7119654B2 (fr)
EP (1) EP1458003B1 (fr)
AT (2) AT412521B (fr)
DE (1) DE502004000675D1 (fr)
PL (1) PL1458003T3 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1569257B1 (fr) * 2004-02-24 2006-07-12 Electrovac, Fabrikation elektrotechnischer Spezialartikel Gesellschaft m.b.H. Capteur de température
JP4916807B2 (ja) * 2006-01-30 2012-04-18 株式会社ダイヘン 電圧検出用プリント基板及びそれを用いた電圧検出器
GB0717051D0 (en) * 2007-09-01 2007-10-17 Ceramaspeed Ltd Temperature sensor
DE102008052127A1 (de) 2008-07-18 2010-01-28 Micro-Epsilon Messtechnik Gmbh & Co. Kg Temperaturmesseinrichtung und Verfahren zur Temperaturmessung
DE102009038960A1 (de) * 2009-08-19 2011-02-24 E.G.O. Elektro-Gerätebau GmbH Temperaturfühler und Verfahren zur Justierung eines solchen Temperaturfühlers
US8884195B2 (en) 2011-12-09 2014-11-11 E.G.O. Elektro-Gerätebau GmbH Heating device, method of producing a heating device and method for operating a heating device
US8933377B2 (en) 2011-12-09 2015-01-13 E.G.O. Elektro-Gerätebau GmbH Control device for an electrical heating device for a cooking field, cooking field and method for operating such an electrical heating device
US20130146582A1 (en) * 2011-12-09 2013-06-13 E.G.O. Elektro-Gerätebau GmbH Heating Device, Cooking Field and Method for Operating a Heating Device
CN108318057A (zh) * 2018-04-13 2018-07-24 航天科技控股集团股份有限公司 一种补偿热变形的传感器
DE102018213625A1 (de) * 2018-08-13 2020-02-13 Siemens Aktiengesellschaft Schaltanlagentemperaturmessung

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE855009C (de) * 1950-11-01 1952-11-10 Erich Dr-Ing Kieback Thermostat
US4008454A (en) * 1975-11-04 1977-02-15 General Electric Company Differential expansion rod and tube thermostat
US4164642A (en) * 1976-12-20 1979-08-14 Ebert Edward A Radiant-hot air heater
AT376540B (de) * 1983-01-05 1984-11-26 Electrovac Vorrichtung zur regelung bzw. begrenzung wenigstens eines temperaturwertes bzw. eines temperaturbereiches von strahlungs- bzw. kontaktheizkoerpern von elektrischen kochgeraeten
GB8324271D0 (en) * 1983-09-10 1983-10-12 Micropore International Ltd Thermal cut-out device
DE3410442A1 (de) * 1983-09-17 1985-09-26 Ego Elektro Blanc & Fischer Temperaturfuehler, insbesondere fuer einen temperaturbegrenzer fuer eine glaskeramik-kocheinheit
US4886070A (en) * 1988-05-11 1989-12-12 Thermometrics, Inc. Method of in vivo calibration of a pressure sensor
DE3929965A1 (de) * 1989-09-08 1991-03-14 Ego Elektro Blanc & Fischer Temperaturschalter
EP0425752B1 (fr) * 1989-11-03 1994-06-08 C.A.E.M. S.R.L. Thermostat électrique ajustable avec compensation de la température
US5036236A (en) * 1990-05-07 1991-07-30 Hughes Aircraft Company Air gap matching proximity sensor for magnetic bearings
GB2263770B (en) * 1992-01-23 1994-11-02 Ceramaspeed Ltd Device for controlling or limiting temperature in an electric cooking appliance
US5390542A (en) * 1993-12-21 1995-02-21 Measurement Technology International Membrane for a fluid flow meter
DE19846513A1 (de) * 1998-10-09 2000-04-13 Ego Elektro Geraetebau Gmbh Schalteinrichtung für eine elektrische Heizeinrichtung
AT409680B (de) * 2001-04-17 2002-10-25 Electrovac Temperaturbegrenzer

Also Published As

Publication number Publication date
DE502004000675D1 (de) 2006-07-20
AT412521B (de) 2005-03-25
US7119654B2 (en) 2006-10-10
PL1458003T3 (pl) 2006-11-30
ATA3622003A (de) 2004-08-15
EP1458003A1 (fr) 2004-09-15
ATE329364T1 (de) 2006-06-15
HK1069256A1 (en) 2005-05-13
US20040178878A1 (en) 2004-09-16

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