DE807647C - Device for stabilizing temperature control based on unsteady operation by means of thermocouples - Google Patents

Device for stabilizing temperature control based on unsteady operation by means of thermocouples

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Publication number
DE807647C
DE807647C DEK384A DEK0000384A DE807647C DE 807647 C DE807647 C DE 807647C DE K384 A DEK384 A DE K384A DE K0000384 A DEK0000384 A DE K0000384A DE 807647 C DE807647 C DE 807647C
Authority
DE
Germany
Prior art keywords
thermocouples
temperature
thermocouple
temperature control
control based
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
Application number
DEK384A
Other languages
German (de)
Inventor
Richard Klisch
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.)
RICHARD KLISCH
Original Assignee
RICHARD KLISCH
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 RICHARD KLISCH filed Critical RICHARD KLISCH
Priority to DEK384A priority Critical patent/DE807647C/en
Application granted granted Critical
Publication of DE807647C publication Critical patent/DE807647C/en
Expired legal-status Critical Current

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Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00Control of temperature
    • G05D23/19Control of temperature characterised by the use of electric means
    • G05D23/20Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/22Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element being a thermocouple
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00Control of temperature
    • G05D23/19Control of temperature characterised by the use of electric means
    • G05D23/1927Control of temperature characterised by the use of electric means using a plurality of sensors

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Temperature (AREA)

Description

Einrichtung zur Stabilisierung von auf unstetiger Arbeitsweise beruhender Temperaturregelung mittels Thermoelemente Bei unstetiger Temperaturregelung, d. h. bei einer Temperaturregelung, welche durch bloßes Ein- und Ausschalten der Heizenergie die Regelung der Temperaturen herbeiführt, treten Schwingungen um den Temperatursollwert auf, die im stationären Zustand zuweilen nicht mehr tragbare Werte annehmen. Diese Schwingungen werden nicht nur durch die Arbeitsweise des Temperaturreglers herbeigeführt, sondern auch zuweilen durch die Ofenträgheit verstärkt.Device for the stabilization of based on discontinuous operation Temperature control by means of thermocouples. H. with temperature control, which is achieved by simply switching the heating energy on and off causes the temperature to be regulated, oscillations occur around the temperature setpoint which sometimes assume unacceptable values in the steady state. These Vibrations are not only caused by the way the temperature controller works, but also sometimes reinforced by the inertia of the furnace.

Stabilisierungseinrichtungen, welche diesem unerwünschten Zustand entgegenwirken, sind seit längerer Zeit bekannt. Bei elektrischen Temperaturreglern, welche mittels Thermoelemente die Temperaturregelung bewirken, werden hierbei in einfacher Weise Thermoelemente kleiner Maße benutzt, welche in den Stromkreis des der Temperaturmessung dienenden Thermoelements, in geeigneter Weise eingefügt werden. Es genügt zu diesem Zweck ein Thermoelement kleiner Maße, welches während der Einschaltdauer des Ofens beheizt wird. Durch den auf diese Weise erzeugten Rückführimpuls eilt der Meßwerkzeiger des Temperaturreglers während der Einschaltdauer des Ofens dem Impuls des Wärmezustands voraus, bewirkt einen lebhafteren Schaltwechsel des Schaltschützes und verkleinert dadurch die Energiezufuhr derart, daß die Schwingungen um den Temperatursollwert praktisch zu Null werden.Stabilization devices, which this undesirable condition counteract have been known for a long time. With electrical temperature regulators, which regulate the temperature by means of thermocouples are shown in simple way thermocouples used, which are in the circuit of the the temperature measurement serving thermocouple, are inserted in a suitable manner. For this purpose, a small thermocouple is sufficient, which is used during the switch-on period of the furnace is heated. The feedback pulse generated in this way rushes the measuring tool of the temperature controller during the switch-on time of the furnace dem The impulse of the heat state ahead, causes a more lively switching change of the contactor and thereby reduces the energy supply in such a way that the oscillations around the temperature setpoint practically go to zero.

Derartige Stabilisierungseinrichtungen werden in der Praxis als Rückführungen bezeichnet. Infolge des Ungleichförmigkeitsgrads eines Temperaturreglers mit Stellungsrückführung ist dessen Sollwert belastungsabhängig. Für seine Einstellung ist deshalb eine besondere Skala erforderlich, welche der Belastungsabhängigkeit Rechnung trägt.Such stabilization devices are used in practice as returns designated. As a result of the degree of non-uniformity of a temperature controller with position feedback its setpoint is load-dependent. For his attitude is therefore a special scale is required, which takes account of stress dependency wearing.

Den Ungleichförmigkeitsgrad kann man zum Abklingen bringen, indem man dem Thermoelement kleiner :Maße ein zweites Thermoelement entgegenschaltet, dessen elektrische Beheizung ständig eingeschaltet bleibt, jedoch entsprechend der Ofenbelastung einstellbar ist, wobei die Einstellung an einer Skala abgelesen werden kann.The degree of non-uniformity can be reduced by if the thermocouple is smaller: dimensions, a second thermocouple is connected opposite, whose electrical heating remains switched on, but according to the Oven load is adjustable, the setting can be read on a scale can.

Es ist auch möglich, dieses zweite Thermoelement mit einer Trägheit zu versehen. In einem solchen Fall werden beide Thermoelemente während der Einschaltdauer des Ofens beheizt. Das trägheitsarme Thermoelement eilt dem Impuls des Wärmezustands voraus und liefert den Rückführimpuls. Mit zunehmender Erreichung des Temperatursollwerts wird dieser immer kleiner, da allmählich auch das träge Thermoelement wärmer wird und eine Thermospannung liefert, welche der des trägheitsarmen Thermoelements entgegenwirkt. Bis auf einen geringen Rest wird die Rückführspannung dadurch praktisch zu Null.It is also possible to use this second thermocouple with an inertia to provide. In such a case, both thermocouples are switched on during the duty cycle of the furnace is heated. The low-inertia thermocouple rushes to the momentum of the heat state ahead and delivers the feedback pulse. As the temperature setpoint is increasingly reached this becomes smaller and smaller, as the inert thermocouple gradually becomes warmer and provides a thermal voltage that opposes that of the low inertia thermocouple. With the exception of a small remainder, the feedback voltage is practically zero.

Es sind auch Anordnungen bekanntgeworden, bei denen die Temperatur des zweiten Thermoelements durch einen besonderen Temperaturregler geregelt wird, wobei diese Regelung so eingestellt werden kann, daß die Aufzeichnung der Temperatur durch ein Schreibgerät mit dem Reglersollwert vollkommen übereinstimmt. Gemäß der Erfindung wird eine solche Einrichtung zur Stabilisierung von auf unstetiger Arbeitsweise beruhender Temperaturregelung mittels Thermoelemente besonders einfach, wenn in den Stromkreis: des der Temperaturmessung dienenden Temperaturfühlers zwei gegeneinandergeschalteteThermoelemente eingefügt werden, deren elektrische Beheizung einstellbar und so geschaltet ist, daß ein Thermoelement während der Einschaltdauer des Ofens und das andere mittels eines Relais während der Ausschaltung des Ofens beheizt wird, so daß das Zusammenwirken ihrer Thermospannungen eine schwingungsfreie Temperaturregelung mit wählbarem Ungleichförmigkeitsgrad herbeiführt.Arrangements have also become known in which the temperature of the second thermocouple is regulated by a special temperature controller, this control can be set so that the recording of the temperature completely matches the controller setpoint using a writing instrument. According to the The invention is such a device for the stabilization of discontinuous operation based temperature control using thermocouples is particularly easy when in The circuit: of the temperature sensor used for temperature measurement, two counter-connected thermocouples inserted, the electrical heating of which is adjustable and switched in such a way that that one thermocouple during the on-time of the furnace and the other means a relay is heated while the furnace is switched off, so that the interaction their thermal voltages a vibration-free temperature control with a selectable degree of non-uniformity brings about.

In dem Beispiel der Zeichnung ist TR einer der bekannten Temperaturregler nach dem Fallbügelprinzip, welcher über Sicherungen Si und Schalter Sch an das Wechselstromnetz angeschlossen ist. Mit TS ist der Temperaturschreiber bezeichnet. Thr und Ths sind die Thermoelemente, welche den Temperaturregler TR und den Temperaturschreiber TS mit dem Impuls versorgen. Das Ofenschütz Schü schaltet die dem Ofen O zuzuführende elektrische Energie ein oder aus. Die Zeichnung läßt erkennen, daß der Spule des Schützes parallel geschaltet sind der Heizwiderstand 2 des. Thermoelements i und die Spule des Relais 5. Daraus geht hervor, daß das Thermoelement 3 durch den Heizwiderstand 4 während der Ausschaltdauer des Ofens O beheizt wird, nachdem der abgefallene Anker des Relais, 5 den Stromkreis des Heizwiderstands 4 geschlossen hat. Die Beheizung der Thermoelemente i und 3 durch die Heizwiderstände 2 und 4 ist einstellbar durch Annähern der temperaturempfindlichen Stellen der Thermoelemente an die Heizwiderstände 2 und 4.In the example in the drawing, TR is one of the known temperature regulators based on the drop bracket principle, which is connected to the alternating current network via fuses Si and switch Sch. The temperature recorder is designated with TS. Thr and Ths are the thermocouples that supply the temperature controller TR and the temperature recorder TS with the pulse. The furnace contactor Schü switches the electrical energy to be supplied to the furnace O on or off. The drawing shows that the coil of the contactor is connected in parallel with the heating resistor 2 of the thermocouple i and the coil of the relay 5. It can be seen that the thermocouple 3 is heated by the heating resistor 4 during the switch-off period of the furnace O after the Dropped armature of the relay, 5 has closed the circuit of the heating resistor 4. The heating of the thermocouples i and 3 by the heating resistors 2 and 4 can be adjusted by bringing the temperature-sensitive points of the thermocouples closer to the heating resistors 2 and 4.

Dadurch, daß die beiden Thermoelemente i und 3 mit ihren Heizwiderständen 2 und 4 und dem Relais 5 zu einem Gerät Rü vereinigt sind, ist es möglich, eine derartige Stabilisierungseinrichtung für auf unstetiger Arbeitsweise beruhende Temperaturregler beliebigen Ursprungs zu verwenden, wobei die Temperaturregelung nach der Ausschlagsmethode oder nach dein Kompensationsverfahren erfolgen darf.Because the two thermocouples i and 3 with their heating resistors 2 and 4 and the relay 5 are combined into one device Rü, it is possible to have a Such stabilization device for temperature regulators based on discontinuous operation of any origin, with temperature control according to the deflection method or according to your compensation procedure.

Claims (2)

PATENTANSPRÜCHE: i. Einrichtung zur Stabilisierung von auf unstetiger Arbeitsweise beruhender Temperaturregelung mittels Thermoelemente, dadurch gekennzeichnet, daß in dem Stromkreis des der Temperaturmessung dienenden Thermoelements Thr zwei gegeneinandergeschaltete Thermoelemente kleiner Maße (1, 3) eingefügt sind, deren elektrische Beheizung (2, 4) einstellbar und so geschaltet ist, daß ein Thermoelement (i) während der Einschaltdauer des Ofens (O) und das andere (3) mittels eines Relais (5) während der Ausschaltdauer des Ofens beheizt wird. PATENT CLAIMS: i. Device for stabilizing temperature control based on discontinuous operation by means of thermocouples, characterized in that two counter-connected thermocouples (1, 3) are inserted into the circuit of the thermocouple Thr serving for temperature measurement, their electrical heating (2, 4) being adjustable and so switched is that one thermocouple (i) is heated during the switch-on period of the oven (O) and the other (3) by means of a relay (5) during the switch-off period of the oven. 2. Einrichtung nach Anspruch i, dadurch gekennzeichnet, daß die Thermoelemente (i, 3), ihre Heizwiderstände (2, 4) und das Relais (5) zu einem Ganzen (Rü) vereinigt sind.2. Device according to claim i, characterized in that the thermocouples (i, 3), their heating resistors (2, 4) and the relay (5) are combined to form a whole (Rü).
DEK384A 1949-11-01 1949-11-01 Device for stabilizing temperature control based on unsteady operation by means of thermocouples Expired DE807647C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEK384A DE807647C (en) 1949-11-01 1949-11-01 Device for stabilizing temperature control based on unsteady operation by means of thermocouples

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK384A DE807647C (en) 1949-11-01 1949-11-01 Device for stabilizing temperature control based on unsteady operation by means of thermocouples

Publications (1)

Publication Number Publication Date
DE807647C true DE807647C (en) 1951-07-02

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DEK384A Expired DE807647C (en) 1949-11-01 1949-11-01 Device for stabilizing temperature control based on unsteady operation by means of thermocouples

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DE (1) DE807647C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE953389C (en) * 1953-07-25 1956-11-29 Erich Kieback Dr Ing Thermostat with control tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE953389C (en) * 1953-07-25 1956-11-29 Erich Kieback Dr Ing Thermostat with control tube

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