EP0604388B1 - Device for controlling the combustion air supply for a stove - Google Patents

Device for controlling the combustion air supply for a stove Download PDF

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Publication number
EP0604388B1
EP0604388B1 EP93890245A EP93890245A EP0604388B1 EP 0604388 B1 EP0604388 B1 EP 0604388B1 EP 93890245 A EP93890245 A EP 93890245A EP 93890245 A EP93890245 A EP 93890245A EP 0604388 B1 EP0604388 B1 EP 0604388B1
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EP
European Patent Office
Prior art keywords
combustion
combustion chamber
sealing element
closure member
adjusting means
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EP93890245A
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German (de)
French (fr)
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EP0604388A1 (en
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Kurt Pfisterer
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
    • F23N5/006—Systems for controlling combustion using detectors sensitive to combustion gas properties the detector being sensitive to oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24B—DOMESTIC STOVES OR RANGES FOR SOLID FUELS; IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
    • F24B1/00—Stoves or ranges
    • F24B1/02—Closed stoves
    • F24B1/028—Closed stoves with means for regulating combustion
    • 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
    • F23N2225/16—Measuring temperature burner temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/02—Air or combustion gas valves or dampers
    • F23N2235/06—Air or combustion gas valves or dampers at the air intake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/02—Air or combustion gas valves or dampers
    • F23N2235/10—Air or combustion gas valves or dampers power assisted, e.g. using electric motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2239/00—Fuels
    • F23N2239/02—Solid fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N3/00—Regulating air supply or draught
    • F23N3/08—Regulating air supply or draught by power-assisted systems
    • 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

Definitions

  • the invention relates to a device for regulating the supply of combustion air to the combustion chamber of a tiled stove, the combustion gases of which via a connector be derived into a chimney by means of an actuatable by an adjusting device Closure member, which is formed, for example, by a thermal actuator Adjustment device is controlled by a control device which with a Temperature sensor and one formed by a combustion chamber door contact Safety device which, when the combustion chamber door is opened, opens the Closure organ causes, is operatively connected.
  • a control device which with a Temperature sensor and one formed by a combustion chamber door contact Safety device which, when the combustion chamber door is opened, opens the Closure organ causes, is operatively connected.
  • a control device which with a Temperature sensor and one formed by a combustion chamber door contact Safety device which, when the combustion chamber door is opened, opens the Closure organ causes, is operatively connected.
  • a control device which with a Temperature sensor and one formed by a combustion chamber door contact Safety device which, when the combustion chamber door is opened
  • the control device by the Temperature sensor influenced so that the closure member, which is the supply of Combustion air regulates, remains fully open until the Fuel has occurred and thereby the temperature of the combustion gases below one predetermined value decreases. Then the closure member is completely closed and the supply of combustion air is completely prevented, so that no air flow in the Combustion chamber arises, through which the stored heat in an undesirable manner via the Chimney is discharged.
  • the temperature sensor is in this known device in Connection piece arranged. The fact that the control device not only by Temperature sensor, but also by the actuatable from the combustion chamber door Safety device is affected, is prevented that when refilling Fuel in the combustion chamber the closure member remains closed and thereby for the refilled fuel there is no combustion air supply.
  • This known device thus ensures maximum security against Flue gas explosions and prevents unwanted dissipation of the stored heat, optimal control of the combustion air supply during the burn up to However, termination of the same is not possible with this known device since this known device the closure member always during the burn is fully open.
  • the CO content in the combustion gas that is discharged through the chimney is on the one hand from the temperature in the furnace, on the other hand from that Combustion chamber supplied amount of combustion air and thus from the position of the Locking device dependent.
  • increased CO levels cause environmental pollution. Besides, will cooled by an excess of air in the combustion chamber and thereby the efficiency of the oven deteriorated.
  • a furnace has become known in which the Combustion is divided into two zones, with air supply to each of the two zones can be regulated independently of one another.
  • the firing performance is Regulation of the air supply depending on the temperature in the exhaust pipe on one optimal value kept in the second zone by measuring the oxygen content the exhaust gases with an oxygen probe the residual oxygen at an optimal value being held.
  • Such a two-stage regulation is in tiled stoves, in which only a single combustion chamber with a single air supply is not provided applicable.
  • the present invention has for its object a device for Control of the combustion air supply to the combustion chamber of a tiled stove to create with which enables the amount of combustion air supplied even during the Burning to adapt to the respective requirements and thus also the CO content in the Setting the combustion gas to an optimal value and thus the load on the Reduce environment.
  • the invention proposes that the Control device is also operatively connected to a lambda probe that the Temperature sensor measures the temperature in the combustion chamber, and that the Lambda sensor is arranged in the connector.
  • the output signal of the lambda probe corresponds to that according to a characteristic curve assigned to this lambda probe Residual oxygen content in the combustion gas.
  • This output signal is now According to the invention supplied to the control device, which also by means of Temperature sensor measured temperature is entered in the combustion chamber.
  • combustion chamber temperature is assigned a certain amount of combustion air, which ensures combustion with optimal efficiency.
  • the Control of the combustion air supply according to the invention thus takes place both in Depending on the temperature in the combustion chamber as well as depending on Residual oxygen in the combustion gas, i.e. depending on the values for cheap combustion with optimal efficiency and minimal environmental impact are decisive. It is thus ensured that, on the one hand, that for the respective Combustion chamber temperature required amount of combustion air is supplied on the other hand, the combustion gas contains only the least possible residual oxygen and so that CO emissions are reduced to a minimum.
  • Regulation will therefore not only the closure member between an open position and Closed position adjusted, but rather there are intermediate positions of the Closure member possible and it becomes the required one by the control device
  • the amount of combustion air supplied is regulated during the combustion.
  • the adjustment device with a for example, a position transmitter formed by a rotary potentiometer coupled with the control device is in operative connection.
  • a heated lambda probe is preferably provided, which also means Start of the combustion process for the proper functioning of the lambda sensor required operating temperature is guaranteed.
  • Temperature sensor flame temperatures are measured by the Combustion chamber temperature can assume different values and therefore that Falsify measurement result is, according to a further feature of the invention Temperature sensor expedient in the combustion gas path in the area of the outlet opening Combustion gases are provided from the combustion chamber.
  • the control device which with the adjustment device for the closure member is coupled, causes a linear adjustment of this adjustment, so that to a To achieve optimal control, the air inlet openings of the closure member linear need to be enlarged or reduced.
  • the closure member consists of one by one Axis pivotable door or the like., So is a linear change in the supply of Combustion air not guaranteed.
  • the closure member with linearly by the adjusting device Openable or closable air inlet openings provided, so that with a through Changing the controlled variables also caused the linear adjustment of the adjustment device Size of the air inlet openings is changed linearly in the desired manner.
  • the closure member consists of two relatively mutually displaceable plates having the air inlet openings. At Displacement of one of these plates relative to the other overlap that in the two Air inlet openings located either completely, partially or not at all, so that the desired linear change in the air supply is ensured.
  • Fig. 1 shows a furnace with the principle of the device according to the invention.
  • Fig. 2 represents the closure member on a larger scale together with the adjusting device.
  • the furnace shown in the drawing has a combustion chamber door 1 for refilling solid fuel and one that closes the ash compartment Ash door 2 in which an opening for the supply of Combustion air is arranged by a closer in Fig.2 shown closure member 3 is lockable.
  • the one inside the oven located, accessible through the combustion chamber door 1 has a Outlet opening 4 for the combustion gases on a Connecting piece 5 is connected to a chimney located in the building, through which the combustion gases generated during combustion be dissipated.
  • combustion air does not have to be provided in the ash door 2 be, but can also be arranged at a different location, for example in the combustion chamber door 1 or in a separate, in the Combustion chamber opening air supply duct.
  • a heated lambda probe 6 is provided which generates an output signal corresponding to the O 2 content of the combustion gases, which is connected via an electrical line 7 to an electronic control device 8 which can be attached anywhere outside the furnace.
  • thermocouple is located in the area of the outlet opening 4 9, the electrical voltage proportional to the burn-up temperature generated.
  • the thermocouple is connected via an electrical line 13 to the electronic control device 8 connected.
  • the closure member 3 consists of two Plates, of which the upper plate 14 is visible, which is relative to the underlying plate in the direction of the double arrow 15 slidably is.
  • the shift is made by, for example, a Adjustment device 16 formed by a thermostatic motor via a linkage 17.
  • the adjustment device is via an electrical line 10 (see FIG. 1) connected to the control device 8.
  • Such a thermal actuator 16 is provided with a reset device that the closure member 3 at Power failure opens to prevent this shutter 3 at is not open after a burning and therefore no supply of Combustion air takes place.
  • Such a thermal actuator contains one Expansion material that expands when heated by electricity and closes the closure member 3, when the Power supply, i.e. in the event of a power failure, but its volume is reduced and thereby causes the closure member 3 to open.
  • Both the top plate 14 and the one below it Plate have air inlet openings 18 which, depending on the position of the cover the two plates more or less relative to each other, whereby the cross section of the air inlet determines it Air inlet openings with a linear displacement of the plate 14 relative to the underlying plate by means of the adjusting device 16 is changed linearly.
  • the linkage 17 is also one of a rotary potentiometer 19 formed position transmitter coupled, which, likewise via the electrical line 10 (see Fig.1), a feedback of the position of the Closure member 3 to the control device 8 causes.
  • Closure member 3 is an optimal supply of combustion air, by which the residual oxygen content in the combustion gas as low as possible is maintained and no deterioration in CO emissions due to Lack of oxygen occurs.
  • the one formed by the door contact 11 Safety device prevents that after opening the combustion chamber door 1 for adding fuel the closure member 3 remains closed and therefore no combustion air is supplied.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
  • Regulation And Control Of Combustion (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zur Regelung der Verbrennungsluftzufuhr zum Brennraum eines Kachelofens, dessen Verbrennungsgase über ein Verbindungsstück in einen Kamin abgeleitet werden, mittels eines von einer Verstelleinrichtung betätigbaren Verschlußorganes, wobei die beispielsweise von einem Thermostellmotor gebildete Verstelleinrichtung von einer Steuereinrichtung gesteuert ist, die mit einem Temperaturfühler und einer von einem Brennraumtürkontakt gebildeten Sicherheitseinrichtung, welche bei einem Öffnen der Brennraumtüre ein Öffnen des Verschlußorganes bewirkt, in Wirkverbindung steht. Eine derartige Vorrichtung ist beispielsweise aus AT-A-395 475 bekannt.The invention relates to a device for regulating the supply of combustion air to the combustion chamber of a tiled stove, the combustion gases of which via a connector be derived into a chimney by means of an actuatable by an adjusting device Closure member, which is formed, for example, by a thermal actuator Adjustment device is controlled by a control device which with a Temperature sensor and one formed by a combustion chamber door contact Safety device which, when the combustion chamber door is opened, opens the Closure organ causes, is operatively connected. Such a device is known for example from AT-A-395 475.

Bei dieser bekannten Vorrichtung wird die Steuereinrichtung durch den Temperaturfühler derart beeinflußt, daß das Verschlußorgan, welches die Zufuhr der Verbrennungsluft regelt, vollständig geöffnet bleibt, bis ein vollständiger Abbrand der Brennstoffe erfolgt ist und dadurch die Temperatur der Verbrennungsgase unter einem vorgegebenen Wert absinkt. Dann wird das Verschlußorgan vollständig geschlossen und die Zufuhr von Verbrennungsluft vollständig unterbunden, sodaß keine Luftströmung im Brennraum entsteht, durch die die gespeicherte Wärme in unerwünschter Weise über den Kamin abgeführt wird. Der Temperaturfühler ist bei dieser bekannten Vorrichtung im Verbindungsstück angeordnet. Dadurch, daß die Steuereinrichtung nicht nur durch den Temperaturfühler, sondern auch durch die von der Brennraumtüre betätigbare Sicherheitseinrichtung beeinflußt wird, wird verhindert, daß bei einem Nachfüllen von Brennstoff in den Brennraum das Verschlußorgan geschlossen bleibt und dadurch für den nachgefüllten Brennstoff keine Verbrennungsluftzufuhr erfolgt.In this known device, the control device by the Temperature sensor influenced so that the closure member, which is the supply of Combustion air regulates, remains fully open until the Fuel has occurred and thereby the temperature of the combustion gases below one predetermined value decreases. Then the closure member is completely closed and the supply of combustion air is completely prevented, so that no air flow in the Combustion chamber arises, through which the stored heat in an undesirable manner via the Chimney is discharged. The temperature sensor is in this known device in Connection piece arranged. The fact that the control device not only by Temperature sensor, but also by the actuatable from the combustion chamber door Safety device is affected, is prevented that when refilling Fuel in the combustion chamber the closure member remains closed and thereby for the refilled fuel there is no combustion air supply.

Diese bekannte Vorrichtung gewährleistet somit eine maximale Sicherheit gegen Rauchgasexplosionen und verhindert eine unerwünschte Abfuhr der gespeicherten Wärme, eine optimale Steuerung der Verbrennungsluftzufuhr während des Abbrandes bis zur Beendigung desselben ist jedoch mit dieser bekannten Vorrichtung nicht möglich, da bei dieser bekannten Vorrichtung das Verschlußorgan während des Abbrandes stets vollständig geöffnet ist.This known device thus ensures maximum security against Flue gas explosions and prevents unwanted dissipation of the stored heat, optimal control of the combustion air supply during the burn up to However, termination of the same is not possible with this known device since this known device the closure member always during the burn is fully open.

Der CO-Gehalt im Verbrennungsgas, das durch den Kamin abgeführt wird, ist einerseits von der Temperatur im Feuerungsraum, andererseits von der dem Feuerungsraum zugeführten Menge an Verbrennungsluft und damit von der Stellung des Verschlußorganes abhängig. Je höher die Temperatur im Brennraum ist, desto geringer ist die für die Verbrennung benötigte Luft. Wird nun stets eine gleich große Menge Verbrennungsluft dem Brennraum zugeführt, so steigt bei einem geringeren Bedarf von Verbrennungsluft die Restsauerstoffmenge im Verbrennungsgas und damit auch der CO-Gehalt. Erhöhter CO-Gehalt bewirkt jedoch eine Belastung der Umwelt. Außerdem wird durch einen Luftüberschuß im Brennraum dieser gekühlt und dadurch der Wirkungsgrad des Ofens verschlechtert.The CO content in the combustion gas that is discharged through the chimney is on the one hand from the temperature in the furnace, on the other hand from that Combustion chamber supplied amount of combustion air and thus from the position of the Locking device dependent. The higher the temperature in the combustion chamber, the lower it is the air required for combustion. Is now always an equal amount Combustion air supplied to the combustion chamber increases with a lower demand of Combustion air is the amount of residual oxygen in the combustion gas and therefore also the CO content. However, increased CO levels cause environmental pollution. Besides, will cooled by an excess of air in the combustion chamber and thereby the efficiency of the oven deteriorated.

Aus der EP-A-409790 ist eine Feuerungsanlage bekanntgeworden, bei welcher die Verbrennung in zwei Zonen unterteilt ist, wobei die Luftzufuhr zu jeder der beiden Zonen unabhängig voneinander regelbar ist. In der ersten Zone wird die Feuerungsleistung durch Regelung der Luftzufuhr in Abhängigkeit von der Temperatur im Abgasstutzen auf einem optimalen Wert gehalten, in der zweiten Zone soll durch Messung des Sauerstoffgehaltes der Abgase mittels einer Sauerstoffsonde der Restsauerstoff auf einem optimalen Wert gehalten werden. Eine derartige zweistufige Regelung ist bei Kachelöfen, bei welchen lediglich ein einziger Brennraum mit einer einzigen Luftzufuhr vorgesehen ist, nicht anwendbar.From EP-A-409790 a furnace has become known in which the Combustion is divided into two zones, with air supply to each of the two zones can be regulated independently of one another. In the first zone, the firing performance is Regulation of the air supply depending on the temperature in the exhaust pipe on one optimal value kept in the second zone by measuring the oxygen content the exhaust gases with an oxygen probe the residual oxygen at an optimal value being held. Such a two-stage regulation is in tiled stoves, in which only a single combustion chamber with a single air supply is not provided applicable.

Die vorliegende Erfindung hat sich zur Aufgabe gestellt, eine Vorrichtung zur Regelung der Verbrennungsluftzufuhr zum Brennraum eines Kachelofens zu schaffen, mit welcher es ermöglicht wird, die Menge der zugeführten Verbrennungsluft auch während des Abbrandes den jeweiligen Erfordernissen anzupassen und damit auch den CO-Gehalt im Verbrennungsgas auf einen optimalen Wert einzustellen und damit die Belastung der Umwelt zu verringern. Zur Lösung dieser Aufgabe schlägt die Erfindung vor, daß die Steuereinrichtung zusätzlich mit einer Lambdasonde in Wirkverbindung steht, daß der Temperaturfühler die im Brennraum vorhandene Temperatur mißt, und daß die Lambdasonde im Verbindungsstück angeordnet ist. Das Ausgangssignal der Lambdasonde entspricht nach einer dieser Lambdasonde zugeordneten Kennlinie dem Restsauerstoffgehalt im Verbrennungsgas. Dieses Ausgangssignal wird nun erfindungsgemäß der Steuereinrichtung zugeführt, welcher auch die mittels des Temperaturfühlers gemessene Temperatur im Brennraum eingegeben wird. Jeder Brennraumtemperatur ist jedoch eine bestimmte Menge von Verbrennungsluft zugeordnet, welche eine Verbrennung mit einem optimalen Wirkungsgrad gewährleistet. Die erfindungsgemäße Regelung der Verbrennungsluftzufuhr erfolgt somit sowohl in Abhängigkeit von der Temperatur im Brennraum als auch in Abhängigkeit vom Restsauerstoff im Verbrennungsgas, also in Abhängigkeit von jenen Werten, welche für eine günstige Verbrennung bei optimalem Wirkungsgrad und geringster Umweltbelastung maßgebend sind. Es ist somit sichergestellt, daß einerseits die für die jeweilige Brennraumtemperatur erforderliche Menge an Verbrennungsluft zugeführt wird, andererseits das Verbrennungsgas nur den geringsmöglichen Restsauerstoff enthält und damit die CO-Emission auf ein Minimum reduziert wird. Bei der erfindungsgemäßen Regelung wird somit das Verschlußorgan nicht nur zwischen einer Offenstellung und einer Schließstellung verstellt, sondern es sind vielmehr auch Zwischenstellungen des Verschlußorganes möglich und es wird durch die Steuereinrichtung die jeweils erforderliche Menge der zugeführten Verbrennungsluft während des Abbrandes geregelt. The present invention has for its object a device for Control of the combustion air supply to the combustion chamber of a tiled stove to create with which enables the amount of combustion air supplied even during the Burning to adapt to the respective requirements and thus also the CO content in the Setting the combustion gas to an optimal value and thus the load on the Reduce environment. To achieve this object, the invention proposes that the Control device is also operatively connected to a lambda probe that the Temperature sensor measures the temperature in the combustion chamber, and that the Lambda sensor is arranged in the connector. The output signal of the lambda probe corresponds to that according to a characteristic curve assigned to this lambda probe Residual oxygen content in the combustion gas. This output signal is now According to the invention supplied to the control device, which also by means of Temperature sensor measured temperature is entered in the combustion chamber. Everyone However, combustion chamber temperature is assigned a certain amount of combustion air, which ensures combustion with optimal efficiency. The Control of the combustion air supply according to the invention thus takes place both in Depending on the temperature in the combustion chamber as well as depending on Residual oxygen in the combustion gas, i.e. depending on the values for cheap combustion with optimal efficiency and minimal environmental impact are decisive. It is thus ensured that, on the one hand, that for the respective Combustion chamber temperature required amount of combustion air is supplied on the other hand, the combustion gas contains only the least possible residual oxygen and so that CO emissions are reduced to a minimum. In the case of the invention Regulation will therefore not only the closure member between an open position and Closed position adjusted, but rather there are intermediate positions of the Closure member possible and it becomes the required one by the control device The amount of combustion air supplied is regulated during the combustion.

Für eine optimale Regelung ist eine Rückmeldung der jeweiligen Stellung des Verschlußorganes zur Steuereinrichtung erforderlich. Um eine solche Rückmeldung zu erzielen, ist gemäß einem weiteren Merkmal der Erfindung die Verstelleinrichtung mit einem beispielsweise von einem Drehpotentiometer gebildeten Stellungsgeber gekuppelt, der mit der Steuereinrichtung in Wirkverbindung steht.For optimal regulation, a feedback of the respective position of the Closure element to the control device required. To get such feedback achieve, according to a further feature of the invention, the adjustment device with a for example, a position transmitter formed by a rotary potentiometer coupled with the control device is in operative connection.

Vorzugsweise ist eine beheizte Lambdasonde vorgesehen, wodurch auch bei Beginn des Verbrennungsvorganges die für die einwandfreie Funktion der Lambdasonde erforderliche Betriebstemperatur gewährleistet ist.A heated lambda probe is preferably provided, which also means Start of the combustion process for the proper functioning of the lambda sensor required operating temperature is guaranteed.

Wie bereits erwähnt, ist es für eine erfindungsgemäße Regelung erforderlich, die Temperatur im Brennraum zu messen, wogegen die tatsächlichen Werte an Restsauerstoff im in den Kamin abgeleiteten Verbrennungsgas festgestellt werden müssen. Um zu vermeiden, daß durch einen unmittelbar in den Brennraum hineinragenden Temperaturfühler Flammtemperaturen gemessen werden, die von der Brennraumtemperatur unterschiedliche Werte annehmen können und daher das Meßergebnis verfälschen, ist gemäß einem weiteren Merkmal der Erfindung der Temperaturfühler zweckmäßig im Verbrennungsgasweg im Bereich der Austrittsöffnung der Verbrennungsgase aus dem Brennraum vorgesehen.As already mentioned, it is necessary for a regulation according to the invention that To measure the temperature in the combustion chamber, whereas the actual values of residual oxygen must be found in the combustion gas discharged into the chimney. In order to avoid that by directly protruding into the combustion chamber Temperature sensor flame temperatures are measured by the Combustion chamber temperature can assume different values and therefore that Falsify measurement result is, according to a further feature of the invention Temperature sensor expedient in the combustion gas path in the area of the outlet opening Combustion gases are provided from the combustion chamber.

Die Steuereinrichtung, welche mit der Verstelleinrichtung für das Verschlußorgan gekuppelt ist, bewirkt eine lineare Verstellung dieser Verstelleinrichtung, sodaß, um eine optimale Regelung zu erzielen, auch die Luftzutrittsöffnungen des Verschlußorganes linear vergrößert oder verkleinert werden müssen. Besteht das Verschlußorgan aus einer um eine Achse verschwenkbaren Türe od.dgl., so ist eine lineare Änderung der Zufuhr von Verbrennungsluft nicht gewährleistet. Aus diesem Grunde ist gemäß einem weiteren Merkmal der Erfindung das Verschlußorgan mit durch die Verstelleinrichtung linear öffenbaren bzw. schließbaren Luftzutrittsöffnungen versehen, sodaß bei einer durch Änderung der Regelgrößen bewirkten linearen Verstellung der Verstelleinrichtung auch die Größe der Luftzutrittsöffnungen in gewünschter Weise linear verändert wird. Bei einer bevorzugten Ausführungsform besteht hiebei das Verschlußorgan aus zwei relativ zueinander verschiebbaren, die Luftzutrittsöffnungen aufweisenden Platten. Bei Verschiebung einer dieser Platte relativ zur anderen überdecken sich die in den beiden Platten befindlichen Luftzutrittsöffnungen entweder vollständig, teilweise oder gar nicht, sodaß hiedurch die gewünschte lineare Änderung der Luftzufuhr gewährleistet ist.The control device, which with the adjustment device for the closure member is coupled, causes a linear adjustment of this adjustment, so that to a To achieve optimal control, the air inlet openings of the closure member linear need to be enlarged or reduced. The closure member consists of one by one Axis pivotable door or the like., So is a linear change in the supply of Combustion air not guaranteed. For this reason, according to another Feature of the invention, the closure member with linearly by the adjusting device Openable or closable air inlet openings provided, so that with a through Changing the controlled variables also caused the linear adjustment of the adjustment device Size of the air inlet openings is changed linearly in the desired manner. At a preferred embodiment hiebei the closure member consists of two relatively mutually displaceable plates having the air inlet openings. At Displacement of one of these plates relative to the other overlap that in the two Air inlet openings located either completely, partially or not at all, so that the desired linear change in the air supply is ensured.

In der Zeichnung ist die Erfindung anhand eines Ausführungsbeispieles schematisch veranschaulicht. Fig. 1 zeigt einen Ofen mit dem Prinzip der erfindungsgemäßen Vorrichtung. Fig. 2 stellt in größerem Maßstab das Verschlußorgan zusammen mit der Verstelleinrichtung dar.In the drawing, the invention is schematic using an exemplary embodiment illustrated. Fig. 1 shows a furnace with the principle of the device according to the invention. Fig. 2 represents the closure member on a larger scale together with the adjusting device.

Der in der Zeichnung dargestellte Ofen weist eine Brennraumtüre 1 zum Nachfüllen des festen Brennstoffes sowie eine das Aschenfach verschließende Aschentüre 2 auf, in der eine Öffnung zur Zufuhr von Verbrennungsluft angeordnet ist, die durch ein in Fig.2 näher dargestelltes Verschlußorgan 3 abschließbar ist. Der im Inneren des Ofens befindliche, durch die Brennraumtüre 1 zugängliche Brennraum weist eine Austrittsöffnung 4 für die Verbrennungsgase auf, die über ein Verbindungsstück 5 mit einem im Gebäude befindlichen Kamin verbunden ist, über welchen die bei der Verbrennung entstehenden Verbrennungsgase abgeführt werden.The furnace shown in the drawing has a combustion chamber door 1 for refilling solid fuel and one that closes the ash compartment Ash door 2 in which an opening for the supply of Combustion air is arranged by a closer in Fig.2 shown closure member 3 is lockable. The one inside the oven located, accessible through the combustion chamber door 1 has a Outlet opening 4 for the combustion gases on a Connecting piece 5 is connected to a chimney located in the building, through which the combustion gases generated during combustion be dissipated.

Die durch das Verschlußorgan 3 verschließbare Öffnung zur Zufuhr von Verbrennungsluft muß natürlich nicht in der Aschentüre 2 vorgesehen sein, sondern kann auch an einer anderen Stelle angeordnet sein, beispielsweise in der Brennraumtüre 1 oder in einem gesonderten, in den Brennraum mündenden Luftzuführungskanal.The closable by the closure member 3 opening for supply Of course, combustion air does not have to be provided in the ash door 2 be, but can also be arranged at a different location, for example in the combustion chamber door 1 or in a separate, in the Combustion chamber opening air supply duct.

Im Verbindungsstück 5 ist eine beheizte Lambdasonde 6 vorgesehen, die ein dem O2-Gehalt der Verbrennungsgase entsprechendes Ausgangssignal erzeugt, das über eine elektrische Leitung 7 mit einer elektronischen Steuereinrichtung 8 verbunden ist, die außerhalb des Ofens an einer beliebigen Stelle angebracht werden kann.In the connecting piece 5, a heated lambda probe 6 is provided which generates an output signal corresponding to the O 2 content of the combustion gases, which is connected via an electrical line 7 to an electronic control device 8 which can be attached anywhere outside the furnace.

Im Bereich der Austrittsöffnung 4 befindet sich ein Thermoelement 9, das eine der Abbrandtemperatur proportionale elektrische Spannung erzeugt. Das Thermoelement ist über eine elektrische Leitung 13 mit der elektronischen Steuereinrichtung 8 verbunden.A thermocouple is located in the area of the outlet opening 4 9, the electrical voltage proportional to the burn-up temperature generated. The thermocouple is connected via an electrical line 13 to the electronic control device 8 connected.

Im Bereich der Brennraumtüre 1 ist ein elektrischer Türkontakt 11 vorgesehen, der beim Öffnen und Schließen der Brennraumtüre 1 betätigt wird und der über eine elektrische Leitung 12 an die Steuereinrichtung 8 angeschlossen ist.In the area of the combustion chamber door 1 there is an electrical door contact 11 provided that actuates when opening and closing the combustion chamber door 1 is and via an electrical line 12 to the control device 8th connected.

Wie aus Fig.2 hervorgeht, besteht das Verschlußorgan 3 aus zwei Platten, von welchen die obere Platte 14 sichtbar ist, welche relativ zur darunter befindlichen Platte in Richtung des Doppelpfeiles 15 verschiebbar ist. Die Verschiebung erfolgt durch eine beispielsweise von einem Thermostellmotor gebildete Verstelleinrichtung 16 über ein Gestänge 17. Die Verstelleinrichtung ist über eine elektrische Leitung 10 (siehe Fig.1) mit der Steuereinrichtung 8 verbunden. Ein solcher Thermostellmotor 16 ist mit einer Rückstellvorrichtung versehen, die das Verschlußorgan 3 bei Stromausfall öffnet, um zu verhindern, daß dieses Verschlußorgan 3 bei einem erfolgenden Abbrand nicht geöffnet ist und daher keine Zufuhr von Verbrennungsluft erfolgt. Ein solcher Thermostellmotor enthält einen Dehnstoff, der sich bei der durch Stromzufuhr erfolgten Erwärmung ausdehnt und dabei das Verschlußorgan 3 schließt, bei einer Unterbrechung der Stromzufuhr, also bei einem Stromausfall, jedoch sein Volumen verringert und dadurch ein Öfnen des Verschlußorganes 3 bewirkt.As can be seen from Figure 2, the closure member 3 consists of two Plates, of which the upper plate 14 is visible, which is relative to the underlying plate in the direction of the double arrow 15 slidably is. The shift is made by, for example, a Adjustment device 16 formed by a thermostatic motor via a linkage 17. The adjustment device is via an electrical line 10 (see FIG. 1) connected to the control device 8. Such a thermal actuator 16 is provided with a reset device that the closure member 3 at Power failure opens to prevent this shutter 3 at is not open after a burning and therefore no supply of Combustion air takes place. Such a thermal actuator contains one Expansion material that expands when heated by electricity and closes the closure member 3, when the Power supply, i.e. in the event of a power failure, but its volume is reduced and thereby causes the closure member 3 to open.

Sowohl die obere Platte 14 als auch die darunter befindliche Platte weisen Luftzutrittsöffnungen 18 auf, die je nach Stellung der beiden Platten relativ zueinander einander mehr oder weniger überdecken, wodurch der den Luftzutritt bestimmende Querschnitt dieser Luftzutrittsöffnungen bei einer linearen Verschiebung der Platte 14 relativ zur darunter liegenden Platte mittels der Verstelleinrichtung 16 linear verändert wird.Both the top plate 14 and the one below it Plate have air inlet openings 18 which, depending on the position of the cover the two plates more or less relative to each other, whereby the cross section of the air inlet determines it Air inlet openings with a linear displacement of the plate 14 relative to the underlying plate by means of the adjusting device 16 is changed linearly.

Das Gestänge 17 ist weiters mit einem von einem Drehpotentiometer 19 gebildeten Stellungsgeber gekuppelt, der, gleichfalls über die elektrische Leitung 10 (siehe Fig.1), eine Rückmeldung der Stellung des Verschlußorganes 3 zur Steuereinrichtung 8 bewirkt.The linkage 17 is also one of a rotary potentiometer 19 formed position transmitter coupled, which, likewise via the electrical line 10 (see Fig.1), a feedback of the position of the Closure member 3 to the control device 8 causes.

Die vom Temperaturfühler 9 und von der Lambdasonde 6 ausgesandten Signale werden in der Steuereinrichtung 8 derart verwertet, daß über das Verschlußorgan 3 eine optimale Zufuhr an Verbrennungsluft erfolgt, durch die der Restsauerstoffgehalt im Verbrennungsgas so gering als möglich gehalten wird und keine Verschlechterung der CO-Emission durch Sauerstoffmangel auftritt. Die durch den Türkontakt 11 gebildete Sicherheitseinrichtung verhindert, daß nach einem Öffnen der Brennraumtüre 1 zum Nachlegen von Brennstoff das Verschlußorgan 3 geschlossen bleibt und daher keine Zufuhr von Verbrennungsluft erfolgt.Those emitted by the temperature sensor 9 and by the lambda probe 6 Signals are used in the control device 8 such that the Closure member 3 is an optimal supply of combustion air, by which the residual oxygen content in the combustion gas as low as possible is maintained and no deterioration in CO emissions due to Lack of oxygen occurs. The one formed by the door contact 11 Safety device prevents that after opening the combustion chamber door 1 for adding fuel the closure member 3 remains closed and therefore no combustion air is supplied.

Claims (6)

  1. A device for controlling tne combustion air supply to the combustion chamber of a tile stove whose combustion gases are diverted via a connecting piece (5) into a chimney, by means of a sealing element (3) actuable by an adjusting means (16), the adjusting means (16) formed, for instance, of a thermoservomotor and controlled by a control means (8) being actively connected to a thermosensor (9) and a safety device formed by a combustion chamber door contact (11) effecting the opening of the sealing element (3) on opening of the combustion chamber door (1), characterized in that the control means (8) is in addition actively connected to a lambda probe (6), that the thermosensor (9) measures the temperature prevailing in the combustion chamber and that the lambda probe (6) is disposed in the connecting piece (5).
  2. The device according to claim 1, characterized in that the adjusting means (16) is coupled to a position indicator formed, for instance, of a rotary potentiometer (19) and actively connected to the control means (8).
  3. The device according to claim 1 or 2, characterized in that a heated lambda probe (6) is provided.
  4. The device according to claim 1, characterized in that the thermosensor (9) is provided in the combustion gas path in the area of the outlet opening (4) of the combustion gases from the combustion chamber.
  5. The device according to any one of the claims 1 to 4, characterized in that the sealing element (3) is provided with air inlet openings (18) to be linearly opened and closed by the adjusting means (16).
  6. The device according to claim 5, characterized in that the sealing element (3) consists of two plates (14) shiftable in relation to one another and provided with the air inlet openings (18).
EP93890245A 1992-12-22 1993-12-16 Device for controlling the combustion air supply for a stove Expired - Lifetime EP0604388B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0254492A AT398483B (en) 1992-12-22 1992-12-22 DEVICE FOR CONTROLLING THE COMBUSTION AIR SUPPLY IN A STOVE
AT2544/92 1992-12-22

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EP0604388A1 EP0604388A1 (en) 1994-06-29
EP0604388B1 true EP0604388B1 (en) 1998-03-25

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EP93890245A Expired - Lifetime EP0604388B1 (en) 1992-12-22 1993-12-16 Device for controlling the combustion air supply for a stove

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EP (1) EP0604388B1 (en)
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Publication number Priority date Publication date Assignee Title
WO1999064789A1 (en) * 1998-05-29 1999-12-16 Morsø Jernstøberi A/S A stove for solid fuel
CH694380A5 (en) * 2000-01-21 2004-12-15 Spiess Ag Heizsysteme & Ofente Furnace for solid fuels.
CA2513724A1 (en) * 2003-02-14 2004-08-26 Fpi Fireplace Products International Ltd. Draft control system and method for heating systems
DK2085694T3 (en) * 2008-01-30 2018-09-03 Ihs Innovation Aps Electronically controlled woodburning stove and control method therefore
DE102008057697A1 (en) 2008-11-17 2010-05-20 Uwe Kannengiesser Device for converting e.g. tile stove into electronically controlled combustion stove, has controller controlling motor using control algorithm so adjustment elements control combustion air quantity necessary for combustion
DE102009005178B4 (en) * 2009-01-15 2012-01-19 Spartherm Feuerungstechnik Gmbh Apparatus for burning solid fuels
DK177394B1 (en) 2011-11-07 2013-03-18 Hwam As Method of combustion of a fuel in a wood-burning stove, a wood-burning stove with a control unit and an air regulator for a wood-burning stove
EP2607788A1 (en) 2011-12-20 2013-06-26 Rudy Cyris Heating device with very little depth and with extended vision
DE102016221446A1 (en) * 2016-11-02 2018-05-03 BSH Hausgeräte GmbH Calibrating an oxygen sensor of a household appliance

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CH180008A (en) * 1934-10-26 1935-10-15 Wagner Rudolf Draft distribution and control device in combustion systems.
AT253658B (en) * 1964-08-28 1967-04-25 Johannes Ing Astmann Device for shutting off or releasing exhaust gas or flue gas ducts
US4150939A (en) * 1977-08-22 1979-04-24 Reliance Instrument Manufacturing Corp. Differential controller for positioning combustion system
AT395475B (en) * 1987-09-23 1993-01-25 Pfisterer Kurt DEVICE FOR CONTROLLING THE COMBUSTION AIR SUPPLY IN A STOVE
JPH02195244A (en) * 1989-01-25 1990-08-01 Fujikura Ltd Method for lengthening service life of electronic device for controlling combustion
EP0409790A1 (en) * 1989-07-19 1991-01-23 Willi Hager Combustion installation

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DE59308306D1 (en) 1998-04-30
AT398483B (en) 1994-12-27
ATA254492A (en) 1994-04-15
EP0604388A1 (en) 1994-06-29

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