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EP1458003A1 - Temperature sensor - Google Patents

Temperature sensor Download PDF

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Publication number
EP1458003A1
EP1458003A1 EP04450054A EP04450054A EP1458003A1 EP 1458003 A1 EP1458003 A1 EP 1458003A1 EP 04450054 A EP04450054 A EP 04450054A EP 04450054 A EP04450054 A EP 04450054A EP 1458003 A1 EP1458003 A1 EP 1458003A1
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.)
Granted
Application number
EP04450054A
Other languages
German (de)
French (fr)
Other versions
EP1458003B1 (en
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/en
Priority to AT04450054T priority patent/ATE329364T1/en
Publication of EP1458003A1 publication Critical patent/EP1458003A1/en
Application granted granted Critical
Publication of EP1458003B1 publication Critical patent/EP1458003B1/en
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. It is in this known solution in the pot of the radiant heater one from the bottom of the pot towering circumferential rib provided, which separates two separately controllable heating coils.
  • the tube of the temperature sensor extends over both heating coils away, wherein
  • the middle part is only on the Area of the central heating coil extends.
  • the two outer parts of the Rods which lie with their front sides against the middle part of the rod, have one Thermal expansion coefficient, at least that of the surrounding pipe corresponds, which is integrally formed, whereas the middle part of the rod is smaller than that of the surrounding pipe.
  • the tube is also formed in three parts, wherein the parts of the tube substantially with those cover the staff.
  • the central portion of the tube has a larger one Thermal expansion coefficient on as the outer sections of the tube and the outer Parts of the rod have a larger thermal expansion coefficient than the middle one Section of the bar.
  • the outer sections, or parts of the tube and the Bar arranged in the region of the outer heating coil. Also in this case it comes to
  • the aim of the invention is to avoid this disadvantage and a temperature sensor of to suggest at the outset, in which a stronger overshoot of the desired Response temperature is avoided with a cold switch housing.
  • the reference numeral 1 denotes a radiant heater which comprises a pot 2, in which a spirally placed heating coil 3 is located in an embedding 4 is embedded.
  • the radiant heater 1 is below a plate 5 made of metal, Glass ceramic, od. The like.
  • Arranged which has the cooking surface 6 at its top.
  • a temperature sensor 7 is arranged, which with a Switch button 18 is in communication, which latter is not shown. It is the Temperature sensor in a simple manner by drilling in the substantially cylindrical Wall of the radiant heater 1, and its pot 2 passed.
  • the temperature sensor 7 is thus exposed to the temperature below the cooking surface. 6 in the radiation space between the cooking surface 6, or the supporting plate 5 and the Heating coil 3 prevails and can thus capture 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 a relatively high thermal expansion coefficient, e.g. from a metal, in particular steel, a two-piece rod 9 held in its interior, both of which Parts with L1 and L2 are designated, as well as held in a housing 10 switch 18, at the movable switching contact 11, 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 hineinerstreckt.
  • the fixed contacts of the switch 18 are denoted by 12 and with Outlets 13 connected.
  • the one end of the tube 8, which may have any cross-section, is completed, this also by an optionally adjustable holder (not shown) for the rod 9, or its part L1 can be carried out. It extends in the built-in state of the temperature sensor 7 of the part L1 of the rod 9 over the range of Radiant heater 1, over which the heating coil 3 extends.
  • the second part of the L2 Bar 9 is located in the region of the wall of the pot 2, which consists of a poorly heat-conducting Material is made, lies in the region of this wall frontally to the part of the rod L1 and extends into the housing 10 of the switch 18, which is outside the Radiant heater 1 is located, but in the boiler room of a cooker that is not closer is shown, is arranged, whereby the housing 10 of the boiler room in the boiler room is exposed to prevailing temperature.
  • the tube 8 of the temperature sensor 7 is fixedly connected to the housing 10 of the switch 18.
  • the temperature sensor of the heat radiation of Heating coil, or in the radiant heater 1 between the heating coil 3 and the plate fifth exposed to prevailing temperature.
  • the tube 8 expands, which considerably larger coefficients of thermal expansion than the part L1 of the rod 9 is stronger, as the rod part L1, whereby the pressure on the movable contact 11 decreases.
  • the contact 11 Upon reaching a corresponding temperature succeeds the contact 11 due to its bias in go over its open position and 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 heat diffusing through the wall of the pot 2.
  • the two parts L1, L2 of the rod 9 have different Heat absorption coefficient, wherein the part L2 of the rod 9 is preferably a having lower heat absorption coefficient.
  • the lower one Heat absorption coefficient causes a lower heat absorption or heating of the rod 9, which is why the temperature equilibrium with the housing later is reached.
  • the switching temperature when switching on the heater i. when the housing of the radiant heater is cold, is higher than the switching temperature in Temperature equilibrium state. It therefore comes when switching on cold housing to an overshoot behavior of the temperature sensor. This allows the The cooking performance is optimized, which means that when the heater is switched on cold condition a higher glass transition temperature is available, causing a shortening the time to reach the cooking temperature is reached.
  • 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 .

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  • 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)
  • Control Of Resistance Heating (AREA)
  • Resistance Heating (AREA)
  • Surgical Instruments (AREA)

Abstract

The tube (8) of the temperature sensor (7) extends all the way across the top of the circular heating element (1). It contains a first long rod (L1.9) which expands when heated and presses on the end of a short rod (L2.9) which extends into a housing (10). The housing contains electrical contacts (11,12) which may be pushed together by expansion of the first rod. The two rods have different coefficients of expansion to compensate for expansion of the housing. The housing may be rotated as a knob (18) to alter the setting of the switch.

Description

Die Erfindung betrifft einen Temperaturfühler gemäß dem Oberbegriff des Anspruches 1.The invention relates to a temperature sensor according to the preamble of claim 1.

Ein solcher Temperaturfühler ist z.B. in der EP 0 141 923 B beschrieben. Dabei ist bei dieser bekannten Lösung in dem Topf des Strahlungsheizkörpers eine von dem Boden des Topfes aufragende umlaufende Rippe vorgesehen, die zwei getrennt steuerbare Heizwendeln trennt.Such a temperature sensor is e.g. in EP 0 141 923 B. It is in this known solution in the pot of the radiant heater one from the bottom of the pot towering circumferential rib provided, which separates two separately controllable heating coils.

Dabei erstreckt sich das Rohr des Temperaturfühlers über beide Heizwendeln hinweg, wobei jedoch in diesem ein dreiteiliger Stab gehalten ist, dessen mittlerer Teil sich lediglich über den Bereich der zentral liegenden Heizwendel erstreckt. Die beiden außen liegenden Teile des Stabes, die mit ihren Stirnseiten an den mittleren Teil des Stabes anliegen, weisen einen Wärmeausdehnungskoeffizienten auf, der zumindest jenem des sie umgebenden Rohres entspricht, das einstückig ausgebildet ist, wogegen der mittlere Teil des Stabes kleiner ist als jener des umgebenden Rohres.In this case, the tube of the temperature sensor extends over both heating coils away, wherein However, in this a three-piece rod is held, the middle part is only on the Area of the central heating coil extends. The two outer parts of the Rods, which lie with their front sides against the middle part of the rod, have one Thermal expansion coefficient, at least that of the surrounding pipe corresponds, which is integrally formed, whereas the middle part of the rod is smaller than that of the surrounding pipe.

Bei einer umgekehrten Auslegung, bei der der Ausdehnungskoeffizient des mittleren Teiles des Stabes größer als jener des ihn umgebenden Rohres ist, weisen die außen liegenden Teile des Stabes einen Ausdehnungskoeffizienten auf, der höchstens so groß wie jener des umgebenden Rohres ist, vorzugsweise jedoch kleiner.In a reverse design, where the coefficient of expansion of the middle part of the rod is greater than that of the surrounding pipe, have the outer parts of the rod has a coefficient of expansion which is at most as large as that of the surrounding pipe is, but preferably smaller.

Durch diese Maßnahme kommt es dazu, dass sich die außen liegenden Teile des Stabes, die sich in den Bereichen der äußeren Heizwendel befinden, gleich oder mehr ausdehnen als das sie umgebende Rohr, wodurch eine Überkompensation des Einflusses der zuschaltbaren Heizwendel erreicht wird und der Temperaturfühler im wesentlichen die Temperatur im zentralen Bereich des Topfes und somit die Temperatur im Bereich der inneren Heizwendel erfasst.By this measure, it happens that the outer parts of the rod, the are in the areas of the outer heating coil, equal or more than that they surrounding pipe, thereby overcompensating the influence of the switchable Heating coil is achieved and the temperature sensor is essentially the temperature in the central area of the pot and thus the temperature in the area of the inner heating coil detected.

Weiters ist in dem oben erwähnten Dokument auch eine Lösung beschrieben, bei der das Rohr ebenfalls dreiteilig ausgebildet ist, wobei sich die Teile des Rohres im wesentlichen mit jenen des Stabes decken. Dabei weist der mittlere Abschnitt des Rohres einen größeren Wärmeausdehnungskoeffizienten auf als die äußeren Abschnitte des Rohres und die äußeren Teile des Stabes weisen einen größeren Wärmeausdehnungskoeffizienten auf, als der mittlere Abschnitt des Stabes. Dabei sind die äußeren Abschnitte, bzw. Teile des Rohres und des Stabes im Bereich der äußeren Heizwendel angeordnet. Auch in diesem Fall kommt es zurFurthermore, a solution is described in the above-mentioned document, in which the tube is also formed in three parts, wherein the parts of the tube substantially with those cover the staff. In this case, the central portion of the tube has a larger one Thermal expansion coefficient on as the outer sections of the tube and the outer Parts of the rod have a larger thermal expansion coefficient than the middle one Section of the bar. Here are the outer sections, or parts of the tube and the Bar arranged in the region of the outer heating coil. Also in this case it comes to

Kompensation des Einflusses der zuschaltbaren äußeren Heizwendel.Compensation of the influence of the switchable outer heating coil.

Bei diesen Lösungen kommt es trotz der Kompensation des Einflusses der äußeren Heizwendel zu einer Verschiebung des Schaltpunktes des Temperaturfühlers. Bedingt ist dies durch den Umstand, dass unvermeidlicherweise Wärme aus dem Topf des Strahlungsheizkörpers in den diesen aufnehmenden Heizraumes aufgrund von Wärmedurchgang und Wärmestrahlung übertritt, wodurch sich auch das Gehäuse des Schalters entsprechend seinem Wärmeausdehnungskoeffizienten ausdehnt und dadurch den Schaltpunkt beeinflusst.These solutions occur despite the compensation of the influence of the outside Heating coil for a shift of the switching point of the temperature sensor. This is conditional by the circumstance that inevitably heat from the pot of the Radiant heater in these receiving boiler room due to Heat transfer and heat radiation transgresses, whereby the housing of the Extends switch according to its thermal expansion coefficient and thereby the Switching point influenced.

Bei üblichen Temperaturfühlern für Strahlungsheizkörper mit einem durchgehenden Stab, der in einem mit dem Gehäuse eines Schalters verbundenen Rohr gehalten ist und sich in das Gehäuse des Schalters hineinerstreckt kommt es zu einem sehr merklichen Absinken der Ansprechtemperatur, wenn sich das Gehäuse des Schalters erwärmt, das meist aus Steatit hergestellt ist und außerhalb des Topfes des Strahlungsheizkörpers angeordnet ist. Dies macht es erforderlich, die Ansprechtemperatur des Fühlers entsprechend hoch anzusetzen, was dazu führt, dass die tatsächliche Ansprechtemperatur bei kaltem Gehäuse des Schalters relativ stark überhöht ist.In conventional temperature sensors for radiant heater with a continuous rod, the is held in a connected to the housing of a switch tube and in the Housing the switch hineinerstreckt it comes to a very noticeable drop in the Response temperature when the housing of the switch heats up, mostly steatite is made and located outside the pot of the radiant heater. This makes it is necessary to set the response temperature of the probe accordingly high, what to do leads that the actual response temperature with cold housing of the switch relatively strong is excessive.

Ziel der Erfindung ist es diesen Nachteil zu vermeiden und einen Temperaturfühler der eingangs erwähnten Art vorzuschlagen, bei dem ein stärkeres Überschießen der gewünschten Ansprechtemperatur bei kaltem Schaltergehäuse vermieden ist.The aim of the invention is to avoid this disadvantage and a temperature sensor of to suggest at the outset, in which a stronger overshoot of the desired Response temperature is avoided with a cold switch housing.

Erfindungsgemäß wird dies bei einem Temperaturfühler der eingangs erwähnten Art durch die kennzeichnenden Merkmale des Anspruches 1 erreicht.According to the invention this is in a temperature sensor of the type mentioned by the characterizing features of claim 1 achieved.

Durch diese Maßnahmen gelingt es, die Ausdehnung des Gehäuses des Schalters zu berücksichtigen und die Verschiebung des Schaltpunktes des Schalters eben aufgrund der Wärmedehnung seines Gehäuses weitgehend oder zur Gänze zu vermeiden.These measures make it possible to extend the housing of the switch take into account and the shift of the switching point of the switch just because of To avoid thermal expansion of its housing largely or entirely.

Ein weiteres Problem liegt darin, dass die in einem eine Heizwendel aufnehmenden Topf erzeugte Wärme durch die Wand des Topfes hindurch in den diesen Topf aufnehmenden Heizraum eines Kochherdes tritt, wodurch sich dieser erwärmt. Insbesondere bei der Anordnung von mehreren Strahlungsheizkörpern in einem Heizraum eines Kochherdes ergeben sich bei einem Vollastbetrieb des Herdes, bei dem alle Strahlungsheizkörper des Herdes in Betrieb sind, relativ hohe Temperaturen im Heizraum. Aus Sicherheitsgründen darf aber die Heizraumtemperatur, bzw. die mit dieser in einem Abhängigkeitsverhältnis stehende Wandanstelltemperatur eines Kochherdes einen bestimmten Wert nicht überschreiten.Another problem is that in a receiving a heating coil pot generated heat through the wall of the pot through into this pot receiving Boiler hearth of a cooker occurs, causing it to heat up. Especially at the Arrangement of several radiant heaters in a boiler room of a cooker arise at a full load operation of the stove, in which all radiators of the Cookers are in operation, relatively high temperatures in the boiler room. For security reasons may but the boiler room temperature, or with this in a dependency relationship Wandanstelltemperatur a cooker do not exceed a certain value.

Durch die Merkmale des Anspruches 2 wird nun erreicht, dass bei einem Kochherd mit mehreren Kochstellen und damit Strahlungsheizkörpern beim aufeinanderfolgenden Zuschalten der einzelnen Kochstellen das Schalten der einzelnen Temperaturfühler abstimmbar ist. Dies erfolgt durch die Wahl der Wärmeausdehnungskoeffizienten des in das Gehäuse des Schalters hineinragenden Teiles des Stabes und des Gehäuses des Schalters. Aufgrund der vorgeschlagenen Auswahlkriterien für die Wärmeausdehnungskoeffizienten kommt es zu einer nur teilweisen Kompensation des Effektes der Wärmedehnung des Gehäuses des Schalters und damit bei höheren Heizraumtemperaturen zu einem Schalten bei niedrigeren Temperaturen, wodurch ein zu weitgehender Anstieg der Heizraumtemperatur und damit der Wandanstelltemperatur vermieden wird.Due to the features of claim 2 is now achieved that in a cooker with several cooking zones and thus radiant heaters at the successive Switching on the individual cooking zones switching the individual temperature sensors is tunable. This is done by choosing the coefficients of thermal expansion of the in the Housing of the switch protruding part of the rod and the housing of the switch. Due to the proposed selection criteria for the thermal expansion coefficients it comes to a partial compensation of the effect of thermal expansion of the Housing of the switch and thus at higher boiler room temperatures to a switching at lower temperatures, causing an excessive increase in the boiler room temperature and thus the Wandanstelltemperatur is avoided.

Durch die Merkmale des Anspruches 3 ergibt sich der Vorteil, dass der Einfluss der Wärmedehnung des Gehäuses des Schalters praktisch vollständig kompensiert werden kann. Dadurch ist eine Steuerung der Strahlungsheizkörper im wesentlichen unabhängig von der Temperatur im Heizraum, in dem der bzw. die Strahlungsheizkörper angeordnet ist bzw. sind.Due to the features of claim 3, there is the advantage that the influence of Thermal expansion of the housing of the switch can be almost completely compensated. As a result, a control of the radiant heater is substantially independent of the Temperature in the boiler room in which the or the radiant heater is or are arranged.

Durch die Merkmale des Anspruches 4 ergibt sich der Vorteil, dass durch die Wahl eines entsprechenden Wärmeabsorptionskoeffizienten die Ansprechzeit des Temperaturfiihlers des Schalters beeinflusst werden kann, wodurch auch der Schaltzeitpunkt des zugeordneten Schalters beeinflusst werden kann. Dadurch ist es möglich die Ankochperformance des entsprechenden Strahlungsheizkörpers zu optimieren.Due to the features of claim 4, there is the advantage that by choosing a corresponding heat absorption coefficient the response time of the temperature sensor of the Switch can be influenced, whereby also the switching time of the assigned Switch can be influenced. Thereby it is possible the warming up performance of the appropriate radiant heater to optimize.

Durch die Merkmale des Anspruches 5 und 6 kann auf einfache Weise der Wärmeabsorptionskoeffizient der beiden Teile des Stabes eingestellt werden.Due to the features of claim 5 and 6 can in a simple way the Heat absorption coefficient of the two parts of the rod can be adjusted.

Im Hinblick auf eine Optimierung der Ankochperformance eines erfindungsgemäßen Strahlungsheizkörpers ist es besonders vorteilhaft die Merkmale des Anspruches 7 vorzusehen.With regard to an optimization of the cooking performance of an inventive Radiant heater, it is particularly advantageous the features of claim. 7 provided.

Die Erfindung wird unter Bezugnahme auf die beigeschlossenen Zeichnungen, in welchen Ausführungsformen dargestellt sind, näher beschrieben. Dabei zeigt:

  • Fig. 1 schematisch einen Heizraum eines Kochherdes mit einem Strahlungsheizkörper in einem Vertikalschnitt,
  • Fig. 2 eine Draufsicht auf den Strahlungsheizkörper nach der Fig. 1 und
  • Fig. 3 schematisch einen erfindungsgemäßen Temperaturfühler in größerem Maßstab.
    • The invention will be further described with reference to the accompanying drawings, in which embodiments are shown. Showing:
  • 1 shows schematically a boiler room of a cooker with a radiant heater in a vertical section,
  • Fig. 2 is a plan view of the radiant heater according to FIGS. 1 and
  • Fig. 3 shows schematically a temperature sensor according to the invention in a larger scale.

    • Mit dem Bezugszeichen 1 ist ein Strahlungsheizkörper bezeichnet, der einen Topf 2 umfasst, in dem sich eine spiralig gelegte Heizwendel 3 befindet, die in eine Einbettmasse 4 eingebettet ist. Der Strahlungsheizkörper 1 ist unterhalb einer Platte 5 aus Metall, Glaskeramik, od. dgl. angeordnet, die die Kochfläche 6 an ihrer Oberseite aufweist. Zwischen der Kochfläche 6 und der Heizwendel 3 ist ein Temperaturfühler 7 angeordnet, der mit einem Schaltknopf 18 in Verbindung steht, welcher letzterer nicht dargestellt ist. Dabei ist der Temperaturfühler in einfacher Weise durch Bohrungen in der im wesentlichen zylindrischen Wand des Strahlungsheizkörpers 1, bzw. seines Topfes 2 hindurchgeführt. The reference numeral 1 denotes a radiant heater which comprises a pot 2, in which a spirally placed heating coil 3 is located in an embedding 4 is embedded. The radiant heater 1 is below a plate 5 made of metal, Glass ceramic, od. The like. Arranged, which has the cooking surface 6 at its top. Between the cooking surface 6 and the heating coil 3, a temperature sensor 7 is arranged, which with a Switch button 18 is in communication, which latter is not shown. It is the Temperature sensor in a simple manner by drilling in the substantially cylindrical Wall of the radiant heater 1, and its pot 2 passed.

    Der Temperaturfühler 7 ist somit der Temperatur ausgesetzt, die unterhalb der Kochfläche 6 in dem Strahlungsraum zwischen der Kochfläche 6, bzw. der diese tragenden Platte 5 und der Heizwendel 3 herrscht und kann damit diese Temperatur erfassen.The temperature sensor 7 is thus exposed to the temperature below the cooking surface. 6 in the radiation space between the cooking surface 6, or the supporting plate 5 and the Heating coil 3 prevails and can thus capture this temperature.

    Der konstruktive Aufbau des Temperaturfühlers 7 geht aus der Fig. 3 hervor.The structural design of the temperature sensor 7 is shown in FIG. 3.

    Im wesentlichen umfasst der Temperaturfühler 7 ein Außenrohr 8 aus einem Material mit einem relativ hohen Wärmeausdehnungskoeffizienten, wie z.B. aus einem Metall, insbesondere Stahl, einen in dessen Innerem gehaltenen zweiteiligen Stab 9, dessen beide Teile mit L1 und L2 bezeichnet sind, sowie einen in einem Gehäuse 10 gehaltenen Schalter 18, an dessen beweglichem Schaltkontakt 11, der gegen seine offene Stellung vorgespannt ist, der Stab 9 mit seinem Teil L2 anliegt, der sich in das Gehäuse 10 des Schalters 8 hineinerstreckt. Die festen Kontakte des Schalters 18 sind mit 12 bezeichnet und mit Ausleitungen 13 verbunden.Essentially, the temperature sensor 7 comprises an outer tube 8 made of a material a relatively high thermal expansion coefficient, e.g. from a metal, in particular steel, a two-piece rod 9 held in its interior, both of which Parts with L1 and L2 are designated, as well as held in a housing 10 switch 18, at the movable switching contact 11, 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 hineinerstreckt. The fixed contacts of the switch 18 are denoted by 12 and with Outlets 13 connected.

    Das eine Ende des Rohres 8, das einen beliebigen Querschnitt aufweisen kann, ist abgeschlossen, wobei dies auch durch eine gegebenenfalls einstellbare Halterung (nicht dargestellt) für den Stab 9, bzw. dessen Teil L1 erfolgen kann. Dabei erstreckt sich im eingebauten Zustand des Temperaturfühlers 7 der Teil L1 des Stabes 9 über den Bereich des Strahlungsheizkörpers 1, über den sich die Heizwendel 3 erstreckt. Der zweite Teil L2 des Stabes 9 liegt im Bereich der Wand des Topfes 2, der aus einem schlecht wärmeleitenden Material hergestellt ist, liegt im Bereich dieser Wand stirnseitig an dem Teil L1 des Stabes an und erstreckt sich in das Gehäuse 10 des Schalters 18, der sich außerhalb des Strahlungsheizkörpers 1 befindet, aber im Heizraum eines Kochherdes, der nicht näher dargestellt ist, angeordnet ist, wodurch das Gehäuse 10 der im Heizraum des Kochherdes herrschenden Temperatur ausgesetzt ist.The one end of the tube 8, which may have any cross-section, is completed, this also by an optionally adjustable holder (not shown) for the rod 9, or its part L1 can be carried out. It extends in the built-in state of the temperature sensor 7 of the part L1 of the rod 9 over the range of Radiant heater 1, over which the heating coil 3 extends. The second part of the L2 Bar 9 is located in the region of the wall of the pot 2, which consists of a poorly heat-conducting Material is made, lies in the region of this wall frontally to the part of the rod L1 and extends into the housing 10 of the switch 18, which is outside the Radiant heater 1 is located, but in the boiler room of a cooker that is not closer is shown, is arranged, whereby the housing 10 of the boiler room in the boiler room is exposed to prevailing temperature.

    Das Rohr 8 des Temperaturfühlers 7 ist mit dem Gehäuse 10 des Schalters 18 fest verbunden.The tube 8 of the temperature sensor 7 is fixedly connected to the housing 10 of the switch 18.

    Bei eingeschalteter Heizwendel 3 ist der Temperaturfühler der Wärmestrahlung der Heizwendel, bzw. der im Strahlungsheizkörper 1 zwischen der Heizwendel 3 und der Platte 5 herrschenden Temperatur ausgesetzt. Dadurch dehnt sich das Rohr 8, das einen erheblich größeren Wärmeausdehnungskoeffizienten aufweist als der Teil L1 des Stabes 9 stärker aus, als der Stabteil L1, wodurch der Druck auf den beweglichen Kontakt 11 sinkt. Bei Erreichen einer entsprechenden Temperatur gelingt es dem Kontakt 11 aufgrund seiner Vorspannung in seine Offenstellung überzugehen und den Stromkreis zur Heizwendel 3 zu unterbrechen.When the heating coil 3 is turned on, the temperature sensor of the heat radiation of Heating coil, or in the radiant heater 1 between the heating coil 3 and the plate fifth exposed to prevailing temperature. As a result, the tube 8 expands, which considerably larger coefficients of thermal expansion than the part L1 of the rod 9 is stronger, as the rod part L1, whereby the pressure on the movable contact 11 decreases. Upon reaching a corresponding temperature succeeds the contact 11 due to its bias in go over its open position and interrupt the circuit to the heating coil 3.

    Da Wärme aus dem Raum des Strahlungsheizkörpers 1 durch die Wand seines Topfes 2 hindurchgeht, erwärmt sich auch der Heizraum und damit das Gehäuse 10, das sich ebenfalls entsprechend seinem Wärmeausdehnungskoeffizienten ausdehnt, was eine entsprechende Verschiebung der festen Kontakte 12 des Schalters relativ zum Ende des Rohres 8 verursacht und damit eine Verschiebung des Schaltpunktes des Schalters 18.Since heat from the space of the radiant heater 1 through the wall of his pot. 2 goes through, and the heating chamber and thus the housing 10, which is also heated according to its thermal expansion coefficient expands, which is a corresponding Displacement of the fixed contacts 12 of the switch relative to the end of the tube 8 causes and thus a shift of the switching point of the switch 18th

    Um dies zu vermeiden, bzw. diesen Effekt auf ein gut verträgliches Maß zu begrenzen, weist der sich in das Gehäuse 10 des Schalters 18 hineinerstreckende Teil L2 des Stabes 9 einen Wärmeausdehnungskoeffizienten auf, der in Verbindung mit seiner axialen Erstreckung ein Produkt ergibt, das in Abhängigkeit vom Produkt aus Wärmeausdehnungskoeffizient des Gehäuses 10 und dessen Erstreckung in Richtung des Stabes 9 von seinem der Wand des Topfes 2 zugekehrten Ende bis zu den Halterungen der festen Kontakte 12 gewählt ist.To avoid this, or to limit this effect to a well-tolerated level, points the extending into the housing 10 of the switch 18 part L2 of the rod 9 a Thermal expansion coefficient, in conjunction with its axial extent a Product which, depending on the product, has the coefficient of thermal expansion of Housing 10 and its extension in the direction of the rod 9 of his the wall of the Topfes 2 facing end to the holders of the fixed contacts 12 is selected.

    Sind diese Produkte gleich gewählt so ergibt sich eine im wesentlichen vollständige Kompensation der Wärmedehnung des Gehäuses 10 und damit eine im wesentlichen vollständige Kompensation des Einflusses der Erwärmung des Gehäuses 10 aufgrund der durch die Wand des Topfes 2 hindurch diffundierenden Wärme.If these products are the same, 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 heat diffusing through the wall of the pot 2.

    Sind dagegen diese Produkte so gewählt, das das Produkt aus Wärmeausdehnungskoeffizienten des sich in das Gehäuse 10 hinein erstreckenden Teiles 12 des Stabes 9 kleiner als das Produkt aus Wärmeausdehnungskoeffizient und Erstreckung des Gehäuses zwischen dessen dem Topf 2 des Strahlungsheizkörpers 1 zugekehrten Endes und den Halterungen seiner festen Kontakte 12 in axialer Richtung des Stabes 9 ist, so kommt es bei steigender Erwärmung des Gehäuses zu einer Verschiebung des Schaltpunktes des Schalters 18 in Richtung zu tieferen Temperaturen hin unter der Voraussetzung, dass der bewegliche Kontakt 11 des Schalters 18 in Richtung zum Rohr 8 hin öffnet.On the other hand, if these products are chosen to be the product Thermal expansion coefficient of extending into the housing 10 in part 12th of the rod 9 smaller than the product of the coefficient of thermal expansion and extension of the Housing between the pot 2 of the radiant heater 1 facing the end and the holders of its fixed contacts 12 in the axial direction of the rod 9 is, so it comes with increasing heating of the housing to a shift of the switching point of Switch 18 toward lower temperatures on the assumption that the movable contact 11 of the switch 18 toward the tube 8 opens.

    Grundsätzlich ist auch eine andere Konfiguration des beweglichen Kontaktes 11 möglich. So kann dieser auch in Richtung seiner geschlossenen Stellung vorgespannt sein. In diesem Falle weist der Stabteil L1 einen größeren Wärmeausdehnungskoeffizienten als das Rohr 8 auf und die oben erwähnten Produkte müssen in einem solchen Fall umgekehrt gewählt werden, um im Sinne einer kinematischen Umkehr den gleichen Effekt zu erzielen.In principle, another configuration of the movable contact 11 is possible. So this can also be biased towards its closed position. In this case the rod part L1 has a larger thermal expansion coefficient than the tube 8 and the products mentioned above must be reversed in such a case in order to in the sense of a kinematic reversal to achieve the same effect.

    Eine im obigen Sinne unvollkommene Kompensation des Einflusses der Erwärmung des Gehäuses 10 kann erwünscht sein, um sicherzustellen, dass bei steigender Temperatur des Gehäuses, was auch eine steigende Temperatur im Heizraum des Kochherdes voraussetzt, was wieder eine steigende Wandanstelltemperatur des Herdes zur Folge hat, die den Strahlungsheizkörpern und damit auch dem Heizraum, zugeführte Energie reduziert wird, aufgrund des Ausschaltens durch den Schalter 18 bei niedrigeren Temperaturen im Strahlungsheizkörper 1. In the above sense imperfect compensation of the influence of the heating of the Housing 10 may be desirable to ensure that as the temperature of the Housing, which also requires a rising temperature in the boiler room of the cooker, which again causes an increasing Wandanstelltemperatur of the stove, the Radiant heaters and thus also the boiler room, supplied energy is reduced, due to the switch-off by the switch 18 at lower temperatures in the Radiant heater 1.

    Weiters weisen die beiden Teile L1, L2 des Stabes 9 unterschiedliche Wärmeabsorptionskoeffizienten auf, wobei der Teil L2 des Stabes 9 vorzugsweise einen niedrigeren Wärmeabsorptionskoeffizienten aufweist. Der geringere Wärmeabsorptionskoeffizient bewirkt eine geringere Wärmeaufnahme bzw. Durchwärmung des Stabes 9, weshalb der Temperatur-Gleichgewichtszustand mit dem Gehäuse später erreicht wird.Furthermore, the two parts L1, L2 of the rod 9 have different Heat absorption coefficient, wherein the part L2 of the rod 9 is preferably a having lower heat absorption coefficient. The lower one Heat absorption coefficient causes a lower heat absorption or heating of the rod 9, which is why the temperature equilibrium with the housing later is reached.

    Auf diese Weise wird erreicht, dass die Schalttemperatur beim Einschalten der Heizung, d.h. bei kaltem Gehäuse des Strahlungsheizkörpers, höher ist, als die Schalttemperatur im Temperatur-Gleichgewichtszustand. Es kommt daher beim Einschalten bei kaltem Gehäuse zu einem Überschwingverhalten des Temperaturfühlers. Dadurch kann die Ankochperformance optimiert werden, was bedeutet, dass beim Einschalten der Heizung im kalten Zustand eine höhere Glastemperatur zur Verfügung steht, wodurch eine Verkürzung der Zeit bis zum Erreichen der Kochtemperatur erreicht wird.In this way it is achieved that the switching temperature when switching on the heater, i. when the housing of the radiant heater is cold, is higher than the switching temperature in Temperature equilibrium state. It therefore comes when switching on cold housing to an overshoot behavior of the temperature sensor. This allows the The cooking performance is optimized, which means that when the heater is switched on cold condition a higher glass transition temperature is available, causing a shortening the time to reach the cooking temperature is reached.

    Eingestellt können die Wärmeabsorptionskoeffizienten durch unterschiedliche Farbgebung, unterschiedliche Oberflächengestaltung, wie z.B. durch Anbringung von Profilierungen oder unterschiedliche Oberflächenrauhigkeit u.dgl. werden, oder aber auch durch unterschiedliche Metallbeimengungen, wie z.B. Al2O3.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 Metallbeimengungen, such as Al 2 O 3 .

    Claims (7)

    Temperaturfühler (7) für Strahlungsheizkörper (1), insbesondere eines Kochherdes, welcher Strahlungsheizkörper (1) im wesentlichen durch eine in einen Topf (2) eingelegte Heizwendel (3) gebildet ist, welcher Heizkörper (1) in einem nach oben zu durch eine eine Kochfläche (6) aufweisende Glaskeramikplatte oder einer Stahlplatte (5) abgedeckten Heizraum angeordnet ist, wobei der Temperaturfühler (7) ein sich durch den Hohlraum des Topfes (2) im wesentlichen parallel zur diesen überdeckenden Platte (5) hindurch erstreckendes und zumindest eine thermisch isolierende Wand des Topfes (2) durchsetzendes Rohr (8) aufweist, dessen eines Ende mit einem Gehäuse (10) eines Schalters (18) verbunden ist, der zumindest einen beweglichen Schaltkontakt (11) aufweist, der mit festen, im Gehäuse (10) gehaltenen Kontakten (12) zusammenwirkt, und sich im Inneren dieses an seinem zweiten Ende abgeschlossenen Rohres (8) ein zumindest zweiteiliger Stab (9) mit seinem einen Ende gehalten ist, welcher Stab (9) sich in das Gehäuse (10) des Schalters (18) hinein erstreckt und den Schaltkontakt (11) betätigt, wobei das Rohr (8) und der zumindest zweiteilige Stab (9) unterschiedliche thermische Ausdehnungskoeffizienten aufweisen, dadurch gekennzeichnet, dass jener Teil (L2) des Stabes (9), welcher sich der in das Gehäuse (10) des Schalters (18) hinein erstreckt, außerhalb des Hohlraumes des Topfes (2) endet und das Produkt aus Wärmeausdehnungskoeffizient des in das Gehäuse (10) des Schalters (18) hineinragenden Teiles (L2) des Stabes (9) und dessen axiale Erstreckung in Abhängigkeit von dem Produkt aus Wärmeausdehnungskoeffizient des Gehäuses (10) des Schalters (18) und dessen in Richtung des Stabes (9) verlaufende Erstreckung bis zu den Halterungen der festen Kontakte (12) des Schalters (18) gewählt ist.Temperature sensor (7) for radiant heater (1), in particular a cooker, which radiant heater (1) substantially by a in a pot (2) inserted heating coil (3) is formed, which radiator (1) in an upwards to a through The temperature sensor (7) extending through the cavity of the pot (2) substantially parallel to this covering plate (5) extending therethrough and at least one thermally insulating Wall of the pot (2) passing through the tube (8), one end of which is connected to a housing (10) of a switch (18) having at least one movable switching contact (11) with fixed, held in the housing (10) Contacts (12) cooperates, and in the interior of this closed at its second end tube (8) is held at least one two-piece rod (9) with its one end, which Bar (9) extends into the housing (10) of the switch (18) and actuates the switch contact (11), wherein the tube (8) and the at least two-part rod (9) have different thermal expansion coefficients, characterized in that Part (L2) of the rod (9) which extends into the housing (10) of the switch (18), outside the cavity of the pot (2) ends and the product of the coefficient of thermal expansion of the housing (10) of the switch (18) projecting part (L2) of the rod (9) and its axial extent as a function of the product of the coefficient of thermal expansion of the housing (10) of the switch (18) and extending in the direction of the rod (9) extension up to the holders of the fixed contacts (12) of the switch (18) is selected. Temperaturfühler gemäß Anspruch 1, dadurch gekennzeichnet, dass das Produkt aus Wärmeausdehnungskoeffizient des in das Gehäuse (10) des Schalters (18) hineinragenden Teiles (L2) des Stabes (9) und dessen axiale Erstreckung kleiner als das Produkt aus Wärmeausdehnungskoeffizient des Gehäuses (10) des Schalters (18) und der Erstreckung des Gehäuses (10) in Richtung des Stabes (9) bis zu den Halterungen der festen Kontakte (12) ist. Temperature sensor according to claim 1, characterized in that the product of coefficient of thermal expansion of the housing (10) of the switch (18) protruding part (L2) of the rod (9) and its axial extent smaller than the product of the coefficient of thermal expansion of the housing (10) the switch (18) and the extension of the housing (10) in the direction of the rod (9) to the holders of the fixed contacts (12). Temperaturfühler gemäß Anspruch 1, dadurch gekennzeichnet, dass das Produkt aus Wärmeausdehnungskoeffizient des Gehäuses (10) des Schalters (18) und der Erstreckung des Gehäuses (10) in Richtung des Stabes (9) bis zu den Halterungen der festen Kontakte (12) und das Produkt aus Wärmeausdehnungskoeffizient des in das Gehäuse (10) hineinragenden Teiles (L2) des Stabes (9) und dessen axiale Erstreckung im wesentlichen gleich sind, wobei das Gehäuse (10) und der in dieses hineinragende Teil (L2) des Stabes (9) vorzugsweise aus dem gleichen Material hergestellt sind und die Erstreckung dieses Teiles (L2) des Stabes (9) im wesentlichen gleich der Erstreckung des Gehäuses (10) in axialer Richtung des Stabes (9) bis zu den Halterungen der festen Kontakte (12) ist.Temperature sensor according to claim 1, characterized in that the product of coefficient of thermal expansion of the housing (10) of the switch (18) and the extension of the housing (10) in the direction of the rod (9) to the holders of the fixed contacts (12) and the Product of coefficient of thermal expansion of the in the housing (10) protruding part (L2) of the rod (9) and its axial extent are substantially equal, wherein the housing (10) and projecting into this part (L2) of the rod (9) preferably are made of the same material and the extent of this part (L2) of the rod (9) is substantially equal to the extent of the housing (10) in the axial direction of the rod (9) to the holders of the fixed contacts (12). Temperaturfühler gemäß einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die beiden Teile (L1, L2) des Stabes (9) einen unterschiedlichen Wärmeabsorptionskoeffizienten ε aufweisen.Temperature sensor according to one of claims 1 to 3, characterized in that the two parts (L1, L2) of the rod (9) have a different heat absorption coefficient ε. Temperaturfühler gemäß Anspruch 4, dadurch gekennzeichnet, dass die Anpassung des Wärmeabsorptionskoeffizienten durch Gestaltung der Oberflächen, z.B. durch Farbgebung, und bzw. oder die Größe der Oberfläche beeinflussende Maßnahmen, wie Profilierungen des Querschnitts oder Einstellung der Rauhigkeit der Oberfläche erfolgt.Temperature sensor according to claim 4, characterized in that the adaptation of the heat absorption coefficient by shaping the surfaces, eg by coloring, and / or the size of the surface influencing measures, such as profiling of the cross section or adjustment of the roughness of the surface takes place. Temperaturfühler gemäß Anspruch 4 oder 5, dadurch gekennzeichnet, dass die Anpassung des Wärmeabsorptionskoeffizienten durch Metallbeimengungen, z.B. Al2O3 erfolgt.Temperature sensor according to claim 4 or 5, characterized in that the adjustment of the heat absorption coefficient by metal additions, eg Al 2 O 3 takes place. Temperaturfühler gemäß einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass Wärmeabsorptionskoeffizient jenes Teiles (L2) des Stabes (9), der sich in das Gehäuse (10) des Schalters (18) hinein erstreckt, auf den entsprechenden Koeffizienten des Gehäuses (10) abgestimmt ist.Temperature sensor according to one of claims 4 to 6, characterized in that the heat absorption coefficient of that part (L2) of the rod (9) which extends into the housing (10) of the switch (18) into the corresponding coefficient of the housing (10) is tuned.
    EP04450054A 2003-03-10 2004-03-08 Temperature sensor Expired - Lifetime EP1458003B1 (en)

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    PL04450054T PL1458003T3 (en) 2003-03-10 2004-03-08 Temperature sensor
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    EP (1) EP1458003B1 (en)
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    DE (1) DE502004000675D1 (en)
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    JP4916807B2 (en) * 2006-01-30 2012-04-18 株式会社ダイヘン Voltage detection printed circuit board and voltage detector using the same
    GB0717051D0 (en) * 2007-09-01 2007-10-17 Ceramaspeed Ltd Temperature sensor
    DE102008052127A1 (en) 2008-07-18 2010-01-28 Micro-Epsilon Messtechnik Gmbh & Co. Kg Temperature measuring device and method for temperature measurement
    DE102009038960A1 (en) * 2009-08-19 2011-02-24 E.G.O. Elektro-Gerätebau GmbH Temperature sensor and method for adjusting such a temperature sensor
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    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
    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
    CN108318057A (en) * 2018-04-13 2018-07-24 航天科技控股集团股份有限公司 A kind of sensor of compensation thermal deformation
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    ATA3622003A (en) 2004-08-15
    HK1069256A1 (en) 2005-05-13
    US20040178878A1 (en) 2004-09-16
    DE502004000675D1 (en) 2006-07-20
    US7119654B2 (en) 2006-10-10
    ATE329364T1 (en) 2006-06-15
    EP1458003B1 (en) 2006-06-07
    PL1458003T3 (en) 2006-11-30
    AT412521B (en) 2005-03-25

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