EP0550055B1 - Method for monitoring a heater - Google Patents

Method for monitoring a heater Download PDF

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Publication number
EP0550055B1
EP0550055B1 EP92122091A EP92122091A EP0550055B1 EP 0550055 B1 EP0550055 B1 EP 0550055B1 EP 92122091 A EP92122091 A EP 92122091A EP 92122091 A EP92122091 A EP 92122091A EP 0550055 B1 EP0550055 B1 EP 0550055B1
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EP
European Patent Office
Prior art keywords
burner
counter
heater
output
decoder
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
EP92122091A
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German (de)
French (fr)
Other versions
EP0550055A1 (en
Inventor
Achim Burgdorf
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.)
VAILLANT B.V.
Vaillant Austria GmbH
Vaillant NV
Vaillant GmbH
Vaillant AS
Vaillant SARL
Vaillant Ltd
Original Assignee
Vaillant Austria GmbH
Vaillant NV
Joh Vaillant GmbH and Co
Vaillant GmbH
Vaillant AS
Vaillant SARL
Vaillant Ltd
Vaillant BV
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Publication of EP0550055A1 publication Critical patent/EP0550055A1/en
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Publication of EP0550055B1 publication Critical patent/EP0550055B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/002—Regulating fuel supply using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/022—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/22—Timing network
    • F23N2223/28—Timing network with more than one timing element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/10—Measuring temperature stack temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/13—Measuring temperature outdoor temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/32—Igniting for a predetermined number of cycles

Definitions

  • the invention relates to a method for operating a safety device for a heater provided with a burner according to the introductory part of the Claim.
  • a fuel-heated heat source has become known is equipped with three temperature sensors.
  • the first temperature sensor is immediately on Exhaust outlet of the heat exchanger, the second at the outlet of the flow control to Exhaust pipe, that is, downstream of the space outlet openings of the flow safety device, and the third Heat exchanger is in the area of this outlet opening in the installation room Heat source.
  • the temperature values of these three temperature sensors are evaluated in order to put the heat source out of operation in the critical case.
  • There is a binary counter for this provided that can be blocked or released. Are the measured values of the Temperature sensors documenting a stable combustion situation within a certain range Limits, corresponding comparators block the inputs of the binary counter, so that it cannot process signals.
  • EP 282 644 A2 describes an automatic burner control for a fuel-heated one Heat source has become known, which also has a counter, the counter reading after a flame goes out and a new start attempt is made. As soon as the adjustable maximum value of the meter reading is reached or exceeded the heat source blocked.
  • the aim of the invention is to avoid the disadvantages described at the outset and to provide a method of the type mentioned at the outset and a device for carrying out the method according to the invention, in which, on the one hand, maintenance of the operation of the device is ensured even when a temporary malfunction occurs, and on the other hand the risk of excessive or dangerous concentration of CO and CO 2 in the installation room of a burner-heated heater is safely avoided.
  • the method according to the invention also reliably prevents that operation with disrupted exhaust gas routing will go unnoticed for a long time and this can endanger the user.
  • a heat exchanger 1 is acted on by a burner 2, the one with a gas line 3, in which a solenoid valve 4 is arranged, with fuel gas is available.
  • a conventional flow safety device 5 is located above the heat exchanger 1 arranged, which leads to an exhaust pipe 6.
  • a Temperature sensor 8 is arranged, which via a measuring line 9 with an evaluation circuit 10 connected is.
  • a pump 12 is arranged, which ensures the circulation of the heating water.
  • a monitoring electrode 14 is arranged, which has a Measuring line 15 is also connected to the evaluation circuit 10, which in turn the Solenoid coil 18 of the solenoid valve 4 is controlled via a line 17.
  • temperature sensors 19 and 22 are arranged, which are about Measuring lines 20 and 23 are connected to an exhaust gas sensor circuit 21, which are connected to the electronic evaluation circuit 10 via an output line 24 is.
  • the exhaust gas sensor circuit 21 evaluates the signals of the two temperature sensors 19, 22 a known algorithm and delivers the presence of an exhaust signal corresponding signal to the evaluation circuit 10.
  • FIG. 2 shows an evaluation circuit according to the invention.
  • the exhaust gas sensor circuit 21 has one input OR gate 30 and a differentiator 31, the latter being an inverter 32 is connected downstream, the output of which is connected to an OR gate 33, the second input is connected to the output of an inverter 34, the input of which a signal corresponding to the heat requirement of a flow temperature controller, not shown connected is.
  • the second input of the OR gate 30 is connected to the output Q x of a decoder 35, which is connected to the outputs of a counter 36.
  • the output of the OR gate 30 is connected to the control input of an oscillator 37, the output of which is connected to an input of a further AND gate 38, the negated further input of which is connected to the output Q x + N + 1 of the decoder 35 is connected.
  • the exits Q x + N + 1 and Q x of the decoder 35 are further connected to the inputs of an OR gate 39 with an inverting output, the output of which acts on the solenoid 18 of the solenoid valve 4. Furthermore, the output of the OR gate 39 is connected to an input of an AND gate 40, the second input of which is connected to the output of the OR gate 33.
  • the counter 36 In normal operation, the counter 36 is reset at the beginning of a heat request. In order to all the outputs of this counter 36 are at zero and the outputs of the decoder 35 are also to zero, so that the output of the inverting output OR gate 39 is "1" and the signal to release the burner to the rest Control and thus to a solenoid valve of the burner.
  • the exhaust gas sensor circuit 21 supplies a signal "1" as soon as the temperature sensors report an exhaust gas leak.
  • the output of the OR gate 30 thus also supplies a "1" signal to the control input of the oscillator 37, which then oscillates. Because the exit Q X + N + 1 still supplies a "0" signal, the oscillator signal is switched from the AND gate 38 to the clock input of the counter 36, which now counts the oscillations of the oscillator.
  • the decoder evaluates the status of the counter outputs.
  • the evaluation circuit 10 can therefore only by switching off the operating voltage, whereby the counter 36 is reset, and the operating voltage is switched on again be put back into operation.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Control Of Combustion (AREA)
  • Control Of Resistance Heating (AREA)
  • Electric Stoves And Ranges (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

Method for monitoring a fireplace-mounted heater arranged in an installation room with a burner which is arranged in a combustion chamber, in which the escape of waste gas into the installation room is detected and the burner is subsequently switched off and, after a predetermined time, in the event of a heat requirement existing, an attempt is made to switch the burner on again. In order on the one hand to make possible continued operation of the device on the occurrence of a temporary fault and on the other hand to prevent a risk as a result of a dangerous rise in the concentration of harmful substances in the installation room of the device, it is envisaged that, after a predetermined number of attempts to switch on again, the burner is finally switched off. <IMAGE>

Description

Die Erfindung bezieht sich auf ein Verfahren zum Betreiben einer Sicherheitseinrichtung für ein mit einem Brenner versehenes Heizgeräte gemäß dem einleitenden Teil des Patentanspruchs.The invention relates to a method for operating a safety device for a heater provided with a burner according to the introductory part of the Claim.

Bei den bisherigen derartigen Verfahren wird nach dem Ansprechen des Abgassensors und Ablauf einer vorgegebenen Zeit ein Wiedereinschaltversuch für den Brenner gestartet, wobei die Zahl der Wiedereinschaltversuche unbegrenzt ist.In previous methods of this type, the response of the exhaust gas sensor and A restart attempt for the burner has started after a predetermined time, whereby the number of restart attempts is unlimited.

Dadurch ergibt sich aber der Nachteil, daß im Falle einer bleibenden Störung und einer ungünstigen Installation des Gerätes, bei dem es sich meist um ein solches handelt, das von Laien bedient wird, wie zum Beispiel Wasserheizer für den Haushalt oder Heizanlagen für Einfamilienhäuser oder Etagenheizungen, der Aufstellungsraum des Gerätes mit CO oder CO2 erfüllt werden kann, wodurch sich entsprechende Gefahren ergeben.However, this has the disadvantage that in the event of a permanent malfunction and an unfavorable installation of the device, which is usually one that is operated by laypersons, such as water heaters for the home or heating systems for single-family houses or floor heating systems, the installation space of the device can be filled with CO or CO 2 , which poses corresponding dangers.

Weiter sind auch Verfahren bekannt, bei denen bei einem Überschreiten eines vorgegebenen CO-Wertes im Brennraum die Energiezufuhr zum Brenner unterbrochen und verriegelt wird, wobei sich jedoch der Nachteil ergibt, daß auch eine nur vorübergehende Störung zu einem längeren Ausfall des Gerätes führt und dieses erst wieder durch einen Fachmann in Betrieb genommen werden kann, was zu einem entsprechend langen Ausfall des Gerätes führt. Methods are also known in which when a predetermined value is exceeded CO value in the combustion chamber, the energy supply to the burner is interrupted and locked is, but there is the disadvantage that even a temporary disturbance prolonged failure of the device and this only by a specialist in Can be put into operation, resulting in a correspondingly long failure of the device leads.

Aus der DE-OS 3 020 228 ist eine brennstoffbeheizte Wärmequelle bekanntgeworden, die mit drei Temperaturfühlern ausgestattet ist. Der erste Temperaturfühler liegt unmittelbar am Abgasauslaß des Wärmetauschers, der zweite am Auslaß der Strömungssicherung zum Abgasrohr, also stromab der Raumauslaßöffnungen der Strömungssicherung, und der dritte Wärmetauscher liegt im Bereich dieser Austrittsöffnung in den Aufstellungsraum der Wärmequelle. Die Temperaturwerte dieser drei Temperaturfühler werden ausgewertet, um im kritischen Fall die Wärmequelle außer Betrieb zu setzen. Hierzu ist ein Binärzähler vorgesehen, der gesperrt oder freigegeben werden kann. Liegen die Meßwerte der Temperaturfühler innerhalb gewisser eine stabile Verbrennungslage dokumentierender Grenzen, so sperren zugehörige Komparatoren die Eingänge des Binärzählers, so daß dieser keine Signale verarbeiten kann. Bewegen sich die Betriebsbedingungen der angeschlossenen Wärmequelle in Richtung auf einen Teilstau der Anlagen, so bedeutet dies, daß bei Unterschreiten eines Grenzwertes der Komparator kippt, so daß der Binärzähler zu zählen anfängt. Hierdurch geht die Wärmequelle für eine gewisse Zeit außer Betrieb. Nach einer gewissen Verzögerungszeit geht die Wärmequelle wieder in Betrieb, wobei dann wieder die Temperaturbedingungen geprüft werden, so daß bei weiteren anhaltenden Teilstaubedingungen der Binärzähler weiterzählt und eine dann längere Betriebspause der Wärmequelle erzwingt. Dies kann sich wiederholen, was dann schlußendlich zu einem endgültigen Abschalten der Wärmequelle führt. Für die Einstellung der einzelnen Zeiten sind monostabile Kippstufen vorgesehen.From DE-OS 3 020 228 a fuel-heated heat source has become known is equipped with three temperature sensors. The first temperature sensor is immediately on Exhaust outlet of the heat exchanger, the second at the outlet of the flow control to Exhaust pipe, that is, downstream of the space outlet openings of the flow safety device, and the third Heat exchanger is in the area of this outlet opening in the installation room Heat source. The temperature values of these three temperature sensors are evaluated in order to put the heat source out of operation in the critical case. There is a binary counter for this provided that can be blocked or released. Are the measured values of the Temperature sensors documenting a stable combustion situation within a certain range Limits, corresponding comparators block the inputs of the binary counter, so that it cannot process signals. Are the operating conditions of the connected heat source in the direction of a partial jam of the systems, means this means that when the limit falls below the limit, the comparator tilts so that the Binary counter starts counting. This causes the heat source to go out for a certain time Business. After a certain delay, the heat source starts up again, then the temperature conditions are checked again, so that at further continued partial dust conditions of the binary counter and then a longer one Forced pause of the heat source. This can be repeated, then what ultimately leads to a final shutdown of the heat source. For hiring monostable flip-flops are provided for the individual times.

Weiterhin ist aus der EP 282 644 A2 ein Feuerungsautomat für eine brennstoffbeheizte Wärmequelle bekanntgeworden, die gleichfalls einen Zähler aufweist, dessen Zählerstand nach Erlöschen einer Flamme und erfolgendem neuem Startversuch jeweils erhöht wird. Sowie der einstellbare Maximalwert des Zählerstandes erreicht oder überschritten wird, wird die Wärmequelle gesperrt.Furthermore, EP 282 644 A2 describes an automatic burner control for a fuel-heated one Heat source has become known, which also has a counter, the counter reading after a flame goes out and a new start attempt is made. As soon as the adjustable maximum value of the meter reading is reached or exceeded the heat source blocked.

Ziel der Erfindung ist es, die eingangs geschilderten Nachteile zu vermeiden und ein Verfahren der eingangs erwähnten Art und eine Einrichtung zur Durchführung des erfindungsgemäßen Verfahrens anzugeben, bei dem einerseits eine Aufrechterhaltung des Betriebes des Gerätes auch bei Auftreten einer vorübergehenden Störung sichergestellt und andererseits die Gefahr einer übermäßigen beziehungsweise gefährlichen Konzentration von CO und CO2 im Aufstellungsraum eines brennerbeheizten Heizgerätes sicher vermieden ist.The aim of the invention is to avoid the disadvantages described at the outset and to provide a method of the type mentioned at the outset and a device for carrying out the method according to the invention, in which, on the one hand, maintenance of the operation of the device is ensured even when a temporary malfunction occurs, and on the other hand the risk of excessive or dangerous concentration of CO and CO 2 in the installation room of a burner-heated heater is safely avoided.

Erfindungsgemäß wird dies bei einem Verfahren der eingangs näher bezeichneten Art durch die kennzeichnenden Merkmale des Patentanspruchs erreicht.According to the invention, this is achieved in a method of the type specified in the introduction achieved the characterizing features of the claim.

Hierdurch erreicht man den Vorteil der Doppelausnutzuns des Binärzählers, indem nämlich dieser nicht nur für die Realisierung der Wiedereinschaltverzögerungszeit ausgenutzt wird, sondern gleichzeitig als Zähler für die Wiedereinschaltungen dient.This gives the advantage of double utilization of the binary counter, namely by this is not only used to implement the reclosing delay time, but also serves as a counter for reclosing.

Dadurch ist sichergestellt, daß es durch vorübergehende Störungen nur zu einem durch die vorgegebene Wartezeit bis zu einem Wiedereinschaltversuch bestimmte Zeit dauernden Ausfall des Gerätes kommt, der vom Benutzer kaum bemerkt wird. Andererseits ist eine unbegrenzte Zahl von Wiedereinschaltversuchen verhindert, die zu einem gefährlichen Anstieg der Schadstoffkonzentration im Aufstellungsraum des Gerätes führen kann. Dabei ist noch zu bemerken, daß auch wiederholte Einschaltversuche vom Benutzer kaum bemerkt werden und dieser daher den Fehler seines Gerätes nicht bemerkt.This ensures that there is only one through the temporary disturbances predefined waiting time until a restart attempt takes a certain time Failure of the device comes, which is hardly noticed by the user. On the other hand, one Prevents unlimited attempts to restart, which can lead to a dangerous Can increase the concentration of pollutants in the installation room of the device. Here it should be noted that even repeated attempts to switch on are hardly noticed by the user are not noticed and therefore the error of his device.

Auf diese Weise wird auch sichergestellt, daß nicht die Zahl der störungsbedingten Abschaltungen einfach aufaddiert wird, da zum Beispiel drei Abschaltungen innerhalb einer Woche durchaus tolerierbar sind, nicht aber zum Beispiel drei Abschaltungen innerhalb einer Stunde.This also ensures that the number of shutdowns caused by the fault is not is simply added up, for example three shutdowns within one Week are tolerable, but not, for example, three shutdowns within one Hour.

Auf diese Weise wird sichergestellt, daß innerhalb einer Wärmeanforderung nur eine bestimmte Anzahl von Wiedereinschaltversuchen möglich sind und daher bei Vorliegen einer echten Störung der Betrieb des Brenners sicher unterbrochen wird. In this way it is ensured that only a certain one within a heat request Number of restart attempts are possible and therefore if there is one real malfunction the burner operation is safely interrupted.

Schaltet zum Beispiel ein Gas-Wasserheizer wegen des Ansprechens eines Abgassensors ab, so bleibt die Wärmeanforderung bestehen. War dieses Ansprechen des Abgassensors die Folge einer kurzzeitigen Störung der Abgasführung, so geht das Gerät nach einer vorgegebenen Verzögerungszeit wieder in Betrieb, bis die Wärmeanforderung beendet ist.Switches a gas water heater, for example, because of the response of an exhaust gas sensor off, the heat requirement remains. Was this response of the exhaust gas sensor the result of a brief fault in the exhaust gas routing, the device goes according to a predetermined Delay time in operation again until the heat request has ended.

Liegt dagegen eine dauerhafte Störung der Abgasführung vor, so wird es nicht zu einer Beendigung der Wärmeanforderung kommen, und das Gerät wird immer wieder über den Abgassensor abgeschaltet. Durch das erfindungsgemäße Verfahren wird auch sicher verhindert, daß ein Betrieb mit gestörter Abgasführung über längere Zeit unbemerkt bleiben und dadurch eine Gefährdung des Benutzers auftreten kann.On the other hand, if there is a permanent fault in the exhaust gas routing, it does not become one Termination of the heat request will come, and the device will keep going over the Exhaust gas sensor switched off. The method according to the invention also reliably prevents that operation with disrupted exhaust gas routing will go unnoticed for a long time and this can endanger the user.

Die Erfindung wird nun anhand der Zeichnung näher erläutert.The invention will now be explained in more detail with reference to the drawing.

Dabei zeigen:

Figur 1
schematisch einen Umlaufwasserheizer und
Figur 2
eine Auswerteschaltung zur Durchführung des erfindungsgemäßen Verfahrens.
Show:
Figure 1
schematically a circulation water heater and
Figure 2
an evaluation circuit for performing the method according to the invention.

Bei dem Umlaufwasserheizer 25 ist ein Wärmetauscher 1 von einem Brenner 2 beaufschlagt, der über eine Gasleitung 3, in dem ein Magnetventil 4 angeordnet ist, mit Brenngas versorgbar ist. Oberhalb des Wärmetauschers 1 ist eine übliche Strömungssicherung 5 angeordnet, die zu einem Abgasrohr 6 führt.In the circulating water heater 25, a heat exchanger 1 is acted on by a burner 2, the one with a gas line 3, in which a solenoid valve 4 is arranged, with fuel gas is available. A conventional flow safety device 5 is located above the heat exchanger 1 arranged, which leads to an exhaust pipe 6.

In einer Vorlaufleitung 7, die vom Wärmetauscher 1 zu einem Heizkörper 11 führt, ist ein Temperaturfühler 8 angeordnet, der über eine Meßleitung 9 mit einer Auswerteschaltung 10 verbunden ist. In a flow line 7, which leads from the heat exchanger 1 to a radiator 11, is a Temperature sensor 8 is arranged, which via a measuring line 9 with an evaluation circuit 10 connected is.

In der Rücklaufleitung 13, die von den Heizkörpern 11 zum Wärmetauscher 1 zurückführt, ist eine Pumpe 12 angeordnet, die für den Umlauf des Heizwassers sorgt.In the return line 13, which leads back from the radiators 11 to the heat exchanger 1 a pump 12 is arranged, which ensures the circulation of the heating water.

Im Bereich des Brenners 2 ist eine Überwachungselektrode 14 angeordnet, die über eine Meßleitung 15 ebenfalls mit der Auswerteschaltung 10 verbunden ist, die ihrerseits die Magnetspule 18 des Magnetventiles 4 über eine Leitung 17 ansteuert.In the area of the burner 2, a monitoring electrode 14 is arranged, which has a Measuring line 15 is also connected to the evaluation circuit 10, which in turn the Solenoid coil 18 of the solenoid valve 4 is controlled via a line 17.

Oberhalb des Wärmetauschers 1 sind Temperaturfühler 19 und 22 angeordnet, die über Meßleitungen 20 beziehungsweise 23 mit einer Abgassensorschaltung 21 verbunden sind, die über eine Ausgangsleitung 24 mit der elektronischen Auswerteschaltung 10 verbunden ist. Die Abgassensorschaltung 21 wertet die Signale den zwe Temperaturfühler 19, 22 nach einem bekannten Algorithmus aus und liefert ein dem Vorhandensein eines Abgassignales entsprechendes Signal an die Auswerteschaltung 10.Above the heat exchanger 1, temperature sensors 19 and 22 are arranged, which are about Measuring lines 20 and 23 are connected to an exhaust gas sensor circuit 21, which are connected to the electronic evaluation circuit 10 via an output line 24 is. The exhaust gas sensor circuit 21 evaluates the signals of the two temperature sensors 19, 22 a known algorithm and delivers the presence of an exhaust signal corresponding signal to the evaluation circuit 10.

Die Figur 2 zeigt eine erfindungsgemäße Auswerteschaltung.FIG. 2 shows an evaluation circuit according to the invention.

Bei der Auswerteschaltung ist die Abgassensorschaltung 21 mit dem einen Eingang eines ODER-Gatters 30 und einem Differenzierer 31 verbunden, wobei dem letzteren ein Inverter 32 nachgeschaltet ist, dessen Ausgang mit einem ODER-Gatter 33 verbunden ist, dessen zweiter Eingang mit dem Ausgang eines Inverters 34 verbunden ist, dessen Eingang mit einem dem Wärmebedarf entsprechenden Signales eines nicht dargestellten Vorlauftemperaturreglers verbunden ist.In the evaluation circuit, the exhaust gas sensor circuit 21 has one input OR gate 30 and a differentiator 31, the latter being an inverter 32 is connected downstream, the output of which is connected to an OR gate 33, the second input is connected to the output of an inverter 34, the input of which a signal corresponding to the heat requirement of a flow temperature controller, not shown connected is.

Der zweite Eingang des ODER-Gatters 30 ist mit dem Ausgang Qx eines Dekoders 35 verbunden, der mit den Ausgängen eines Zählers 36 verbunden ist.The second input of the OR gate 30 is connected to the output Q x of a decoder 35, which is connected to the outputs of a counter 36.

Der Ausgang des ODER-Gatters 30 ist mit dem Steuereingang eines Oszillators 37 verbunden, dessen Ausgang mit einem Eingang eines weiteren UND-Gatters 38 verbunden ist, dessen negierter weiterer Eingang mit dem Ausgang Qx+N+1 des Dekoders 35 verbunden ist.The output of the OR gate 30 is connected to the control input of an oscillator 37, the output of which is connected to an input of a further AND gate 38, the negated further input of which is connected to the output Q x + N + 1 of the decoder 35 is connected.

Der Ausgang dieses UND-Gatters 38 ist mit dem Zähleingang des Zählers 36 verbunden.The output of this AND gate 38 is connected to the counter input of the counter 36.

Die Ausgänge Qx+N+1 und Qx des Dekoders 35 sind weiter mit den Eingängen eines ODER-Gatters 39 mit invertierendem Ausgang verbunden, dessen Ausgang auf die Magnetspule 18 des Magnetventiles 4 wirkt. Weiter ist der Ausgang des ODER-Gatters 39 mit einem Eingang eines UND-Gatters 40 verbunden, dessen zweiter Eingang mit dem Ausgang des ODER-Gatters 33 verbunden ist.The exits Q x + N + 1 and Q x of the decoder 35 are further connected to the inputs of an OR gate 39 with an inverting output, the output of which acts on the solenoid 18 of the solenoid valve 4. Furthermore, the output of the OR gate 39 is connected to an input of an AND gate 40, the second input of which is connected to the output of the OR gate 33.

Im Normalbetrieb ist zu Beginn einer Wärmeanforderung der Zähler 36 zurückgesetzt. Damit sind alle Ausgänge dieses Zählers 36 auf Null, und die Ausgänge des Dekoders 35 sind ebenfalls auf Null, so daß der Ausgang des einen invertierenden Ausgang aufweisenden ODER-Gatters 39 "1" ist und das Signal zur Freigabe des Brenners an die restliche Steuerung und damit an ein Magnetventil des Brenners liefert.In normal operation, the counter 36 is reset at the beginning of a heat request. In order to all the outputs of this counter 36 are at zero and the outputs of the decoder 35 are also to zero, so that the output of the inverting output OR gate 39 is "1" and the signal to release the burner to the rest Control and thus to a solenoid valve of the burner.

Bei einem Abgasaustritt in den Aufstellraum liefert die Abgassensorschaltung 21, sobald die Temperaturfühler einen Abgasaustritt melden, ein Signal "1". Damit liefert auch der Ausgang des ODER-Gatters 30 ein "1"-Signal an den Steuereingang des Oszillators 37, der daraufhin anschwingt. Da der Ausgang QX+N+1 noch ein "0"-Signal liefert, wird das Oszillatorsignal von dem UND-Gatter 38 auf den Takteingang des Zählers 36 geschaltet, der jetzt die Schwingungen des Oszillators zählt.If an exhaust gas leaks into the installation space, the exhaust gas sensor circuit 21 supplies a signal "1" as soon as the temperature sensors report an exhaust gas leak. The output of the OR gate 30 thus also supplies a "1" signal to the control input of the oscillator 37, which then oscillates. Because the exit Q X + N + 1 still supplies a "0" signal, the oscillator signal is switched from the AND gate 38 to the clock input of the counter 36, which now counts the oscillations of the oscillator.

Der Dekoder wertet den Stand der Zählerausgänge aus.The decoder evaluates the status of the counter outputs.

Endet nun der Abgasaustritt bevor der Dekoderausgang Qx auf den Wert "1" gegangen ist, das heißt vor Ablauf der Abschaltverzögerungszeit, so bewirkt der Wechsel des Ausganges der Abgassensorschaltung 21 von "1" auf "0" über den Differenzierer 31 den Inverter 32, das ODER-Gatter 33 und das UND-Gatter 40 einen kurzzeitigen Impuls am Rücksetzeingang des Zählers 36 und damit ein Rücksetzen des Zählers 36.If the exhaust gas outlet ends before the decoder output Q x has gone to the value "1", that is to say before the switch-off delay time has elapsed, the change in the output of the exhaust gas sensor circuit 21 from "1" to "0" causes the inverter 32 via the differentiator 31, the OR gate 33 and the AND gate 40 a brief pulse at the reset input of the counter 36 and thus a reset of the counter 36.

Ebenso bewirkt das Ende der Wärmeanforderung über die Gatter 34, 30 und 40 ein "1"-Signal am Rücksetzeingang und damit ein Rücksetzen des Zählers 36.Likewise, the end of the heat request via gates 34, 30 and 40 causes a "1" signal at the reset input and thus a reset of the counter 36.

Dauert der Abgasaustritt über die Dauer der Abschaltverzögerungszeit an, so wird der Ausgang Qx des Dekoders 35 "1". Dies bewirkt zum einen, daß der Ausgang des NOR-Gatters 39 "0" wird und damit das Brennerfreigabesignal abgeschaltet wird, zum anderen, daß das Ausgangssignal des ODER-Gatters 30 unabhängig vom Ausgangssignal der Abgassensorschaltung 21 "1" wird, so daß der Oszillator schwingt, bis der Dekoder-Ausgang Qx wieder "O" wird. Dann wird der Ausgang des NOR-Gatters 39 wieder "1" und damit der Brenner wieder freigegeben.If the exhaust gas outlet continues for the duration of the switch-off delay time, the output Q x of the decoder 35 becomes "1". On the one hand, this causes the output of the NOR gate 39 to become "0" and thus the burner release signal is switched off, and on the other hand, that the output signal of the OR gate 30 becomes "1" regardless of the output signal of the exhaust gas sensor circuit 21, so that the oscillator oscillates until the decoder output Q x becomes "O" again. Then the output of NOR gate 39 becomes "1" again and the burner is released again.

Bei weiterem Abgasaustritt wiederholt sich der Vorgang. Der Brenner kann n-mal wieder in Betrieb gehen. Wenn jedoch der Dekoder-Ausgang Qx+N+1 "1" geworden ist, bewirkt er über den invertierenden Eingang des UND-Gatters 38, daß der Takteingang des Zählers 36 dauernd auf "0" bleibt und der Zähler 36 damit angehalten wird.If the exhaust gas continues to escape, the process is repeated. The burner can start up n times. However, if the decoder output Q x + N + 1 Has become "1", it causes via the inverting input of the AND gate 38 that the clock input of the counter 36 remains permanently at "0" and the counter 36 is thus stopped.

Da der Ausgang Qx+N+1 über das NOR-Gatter 39 gleichzeitig die Brennerfreigabe beendet, wird der Brenner blockierend abgeschaltet. Dies erfolgt über das UND-Gatter 40, dessen Ausgang wegen des "0"-Signales vom NOR-Gatter 39 ebenfalls "0" wird. Damit wird verhindert, daß von der Abgassensorschaltung 21 oder durch Beendigung der Wärmeanforderung der Zähler 36 zurückgesetzt werden kann.Because the exit Q x + N + 1 The burner release ends at the same time via the NOR gate 39, the burner is switched off in a blocking manner. This is done via the AND gate 40, the output of which also becomes "0" because of the "0" signal from the NOR gate 39. This prevents the exhaust gas sensor circuit 21 or the counter 36 from being reset by the completion of the heat request.

Die Auswerteschaltung 10 kann daher nur durch Abschalten der Betriebsspannung, wodurch der Zähler 36 zurückgesetzt wird, und abermaliges Einschalten der Betriebsspannung wieder in Betrieb genommen werden.The evaluation circuit 10 can therefore only by switching off the operating voltage, whereby the counter 36 is reset, and the operating voltage is switched on again be put back into operation.

Claims (1)

  1. Process for the operation of a safety device for a heater provided with a burner, such heater being associated with a flue gas sensor (21) sensing the flue gas outlet into the room where the heater is installed, with the safety device, dependent on a heat demand signal, generating a burner enable signal for starting the heater, and with the safety device further comprising a binary counter (36) which, when a defined counter reading has been reached, interlockingly shuts off the burner by suppress-ing the burner enable signal, characterised in that the flue gas sensor (21), when responding, triggers an oscillator (37) feeding the binary counter (36) with pulses, operating in such a way that, when a first counter reading (Qx) of the binary counter is reached, a decoder (35) associated with the binary counter responds and inter-rupts the burner enable signal which latter, when a second, higher counter reading decoded by the decoder (35) is reached, is generated again, such process being repeated in the case of further responses of the flue gas sensor at higher counter readings decoded by the decoder, until the burner, when a defined counter reading (Qx + N + 1) is reached, is shut off interlockingly with the binary counter being stopped.
EP92122091A 1991-12-30 1992-12-29 Method for monitoring a heater Expired - Lifetime EP0550055B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0256891A AT400756B (en) 1991-12-30 1991-12-30 SAFETY DEVICE FOR MONITORING A HEATER
AT2568/91 1991-12-30
AT256891 1991-12-30

Publications (2)

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EP0550055A1 EP0550055A1 (en) 1993-07-07
EP0550055B1 true EP0550055B1 (en) 2000-01-26

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EP92122091A Expired - Lifetime EP0550055B1 (en) 1991-12-30 1992-12-29 Method for monitoring a heater

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EP (1) EP0550055B1 (en)
AT (2) AT400756B (en)
DE (2) DE4244428C2 (en)
ES (1) ES2143984T3 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1479984A1 (en) * 2003-01-30 2004-11-24 Vaillant GmbH Method and apparatus for preventive failure detection by electronic controlled device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3020228C2 (en) * 1980-05-24 1984-08-09 Joh. Vaillant Gmbh U. Co, 5630 Remscheid Safety device for fuel-heated devices
DE3925734A1 (en) * 1988-08-05 1990-02-08 Vaillant Joh Gmbh & Co Monitoring circuit for timing element - provides start monitoring by switching pulse oscillator frequency to higher value
CH681039A5 (en) * 1990-03-23 1992-12-31 Landis & Gyr Betriebs Ag

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AT400756B (en) 1996-03-25
EP0550055A1 (en) 1993-07-07
DE4244428A1 (en) 1993-07-01
DE4244428C2 (en) 2003-07-10
ATE189300T1 (en) 2000-02-15
DE59209803D1 (en) 2000-03-02
ATA256891A (en) 1995-07-15
ES2143984T3 (en) 2000-06-01

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