EP1084369B1 - Gas burner regulating system - Google Patents

Gas burner regulating system Download PDF

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Publication number
EP1084369B1
EP1084369B1 EP99955316A EP99955316A EP1084369B1 EP 1084369 B1 EP1084369 B1 EP 1084369B1 EP 99955316 A EP99955316 A EP 99955316A EP 99955316 A EP99955316 A EP 99955316A EP 1084369 B1 EP1084369 B1 EP 1084369B1
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EP
European Patent Office
Prior art keywords
gas
line
combustion air
flow
sensor
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Expired - Lifetime
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EP99955316A
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German (de)
French (fr)
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EP1084369A1 (en
Inventor
Enno Vrolijk
Tom Gerretsen
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Garrett Motion SARL
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Honeywell BV
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N5/184—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/022—Regulating fuel supply conjointly with air 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
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N5/188—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N2005/181—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/02—Starting or ignition cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/16—Fuel valves variable flow or proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2900/00—Special features of, or arrangements for controlling combustion
    • F23N2900/05181—Controlling air to fuel ratio by using a single differential pressure detector
    • 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 control device for gas burners according to the preamble of Claim 1.
  • Such a control device is in each case from the JP 60 029516 A and JP 60 000 211 A known.
  • Control devices for gas burners serve to provide a gas / air mixture, that is, supplying a gas flow and a combustion air flow to a burner.
  • the gas flow through a gas valve is dependent on the combustion air pressure adjustable.
  • Control devices for gas burners of the above type are known from the prior art, for. B. EP 0 390 964 A1, well known.
  • the pressure is determined by means of a membrane, ie pneumatically.
  • the gas flow is regulated by the gas valve.
  • this pneumatic path has a variety of disadvantages, all of them restrict the scope of known control devices. That's how they limit you Hysteresis characteristics of the membrane and that between the membrane and the gas valve acting forces the work area and thus the scope.
  • the present invention is based on the problem, a To provide control device for gas burners, which avoids the above disadvantages and thus has a wider scope.
  • the present invention relates to control devices for gas burners.
  • One not shown Burner should be supplied to a gas / air mixture.
  • a first line 10 is provided, the the gas flow leads to the burner.
  • the first line 10 is associated with a gas valve 11.
  • the second line 12 thus leads the combustion air flow to the burner.
  • the second line 12 is associated with a blower 13.
  • the speed of the Blower 13 determines the combustion air pressure and thus the combustion air flow.
  • an aperture or throttle 14 is arranged within the combustion air flow contacting second conduit 12.
  • the first line 10 leading to the gas flow opens into Flow direction of the combustion air behind the throttle point 14 in the Combustion air flow leading second line 12.
  • a gas nozzle 15 closes the first Line 10 in the region of the second line 12 from. In the flow direction behind the Gas nozzle 15 is therefore present before a gas / air mixture.
  • the gas pressure should also by 1mbar increase.
  • this is between the first leading the gas flow Line 10 and the combustion air flow leading second line 12 a sensor 16 arranged.
  • the sensor 16 is a differential pressure sensor, in particular as Flow meter, anemometer or the like, formed.
  • the sensor 16 With a first measuring point 17, the sensor 16 is at the first gas flow leading Line 10 connected. With a second measuring point 18, the sensor 16 is at the Combustion air flow leading second conduit 12 connected. In Flow direction of the gas, the first measuring point 17 is positioned in front of the gas nozzle 15. The second measuring point 18 is in the flow direction of the combustion air before Throttle 14 arranged.
  • the gas pressure must be the combustion air pressure correspond.
  • the sensor 16 as a flowmeter or anemometer is formed, this means that the flow through the sensor 16 is zero. takes e.g. the combustion air pressure against the gas pressure, the sensor 16 learns a flow from the first line 10 in the direction of the second line 12. Takes however, the combustion air pressure against the gas pressure, so learns the sensor 16th a flow from the second conduit 12 in the direction of the first conduit 10th Due to the flow rate and due to the flow direction can therefore from the sensor 16, the pressure conditions between combustion air pressure and gas pressure be determined.
  • the sensor 16 generates depending on the above pressure ratios an electrical or electronic signal 19, which is used to adjust the gas valve 11.
  • the electrical or electronic signal 19 is a control or Regulator 20 is supplied, which from the signal 19, a control signal 21 for a the Gas valve 11 associated actuator 22 generates.
  • the gas valve 11 can be configured as desired.
  • the actuator 22 of the gas valve 11 is controlled such that the gas valve 11 between the States On / Off or On / Off toggles.
  • the gas valve 11 At one compared to the gas pressure higher combustion air pressure will consequently produce a control signal 21, on the basis of which the actuator 22, the gas valve 11 opens or activates.
  • the gas valve 11 At a in contrast to the gas pressure lower combustion air pressure is due to the Control signal 21 of the actuator 22, the gas valve 11, however, close or deactivate.
  • a resulting oscillating signal provides information about the proper functioning of the regulatory system and can therefore be considered Safety signal can be used. As long as the oscillating sensor signal is present, can a gas valve 11 upstream, not shown safety valve activated or be open.
  • the control device shown in Figure 1 in the case in which the gas valve 11th is closed, used for air flow measurement.
  • the sensor 16 is connected to the second measuring point 18 on the second line 12, namely in the flow direction of the combustion air in front of the throttle point 14, arranged is; and furthermore the sensor 16 with the first measuring point 17 on the first line 10, ie with closed gas valve 11 via the gas nozzle 15 in the flow direction of the Combustion air is arranged after the throttle point 14.
  • closed gas valve 11 can therefore with the aid of the sensor 16, the pressure difference across the throttle point 14th determined and thus an air flow measurement are performed.
  • Air flow metering can be used to control the parameter range of the blower 13 depending on a configuration of the combustion air supply and flue gas discharge adjust. Also, the air flow measurement of the monitoring and Setting a minimum combustion air supply, which ensures the safe start of the Gas burner is needed.
  • a different ratio between Gas flow and air flow can be realized, so a 1: N gas / air composite control.
  • a coupling line 23 is provided wherein within the coupling line 23 two constrictions 24, 25 are arranged. at the constrictions 24, 25 are throttling points.
  • the coupling line 23 is shown in FIG 2 to the combustion air flow leading second Line 12 in the flow direction of the combustion air to or behind the throttle point 14 connected.
  • the leading to the gas flow first line 10 is the Coupling line 23 connected in the flow direction of the gas in front of the gas nozzle 15.
  • the sensor 16 is likewise in the same way as in FIG Embodiment according to Figure 1 - between the first line 10 and the second Line 12 is arranged.
  • the first Measuring point 17 in the region of the coupling line 23 between the constrictions 24, 25th arranged.
  • the second measuring point 18 is again in the region of the second line 12 in FIG Flow direction of the combustion air upstream of the throttle point 14 is arranged.
  • the controller 20 generates a Control signal 21 for the actuator 22 of the gas valve 11, such that the signal 19 of the Sensor 16 is guided to an amount corresponding to a pressure difference of zero.
  • the arrangement of the coupling line 23 with the devices 21, 25 is thereby realizing a 1: N gas / air composite control, i. that with an increase in the Combustion air pressure of 1 mbar, the gas pressure is increased by N mbar.
  • control device is therefore a 1: N gas / air composite control possible.
  • the gas pressure in relation to the combustion air pressure are amplified.
  • the degree the gain is determined by the constrictions 24, 25.
  • one of the constrictions 24, 25 variable or can be made changeable.

Abstract

The invention relates to a regulating system for a gas burner. Regulating systems for gas burners are used for guiding a gas flow and a combustion air flow to the burner. The gas flow can be regulated depending on combustion air pressure. Pressure is measured in known regulating devices with the aid of a membrane, that is pneumatically. Said pneumatic pressure measurement limits the scope of application of known regulating devices. In the inventive regulating device, a sensor (16) is arranged between a first line (10) guiding a gas flow and a second line (12) guiding the combustion air flow, an electric or electronic signal (19) being generated by said sensor that is used to regulate the gas valve (11).

Description

Die Erfindung betrifft eine Regeleinrichtung für Gasbrenner gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a control device for gas burners according to the preamble of Claim 1.

Eine derartige Regeleinrichtung gemäß dem Oberbegriff des Anspruchs 1 ist jeweils aus der JP 60 029516 A und der JP 60 000 211 A bekannt.Such a control device according to the preamble of claim 1 is in each case from the JP 60 029516 A and JP 60 000 211 A known.

Regeleinrichtungen für Gasbrenner dienen der Bereitstellung eines Gas/Luft-Gemisches, also dem Zuführen eines Gasstroms und eines Verbrennungsluftstroms zu einem Brenner. Der Gasstrom durch ein Gasventil ist dabei in Abhängigkeit vom Verbrennungsluftdruck einstellbar.Control devices for gas burners serve to provide a gas / air mixture, that is, supplying a gas flow and a combustion air flow to a burner. The gas flow through a gas valve is dependent on the combustion air pressure adjustable.

Regeleinrichtungen für Gasbrenner der obigen Art sind aus dem Stand der Technik, z. B. der EP 0 390 964 A1, hinlänglich bekannt. Bei der dort beschriebenen Regeleinrichtung erfolgt die Druckbestimmung mit Hilfe einer Membran, also auf pneumatischem Weg. Abhängig von dieser Druckmessung wird der Gasstrom durch das Gasventil geregelt. Dieser pneumatische Weg verfügt jedoch über eine Vielzahl von Nachteilen, die allesamt den Anwendungsbereich bekannter Regeleinrichtungen einschränken. So schränken die Hysterese-Eigenschaften der Membran und die zwischen der Membran und dem Gasventil wirkenden Kräfte den Arbeitsbereich und damit den Anwendungsbereich ein. Des weiteren bewirkt das Zusammenspiel zwischen den erforderlichen kleinen Stellkräften und den Betriebstoleranzen der Membran.infolge von Störeinflüssen wie Temperaturschwankungen oder dergleichen eine Einschränkung des Anwendungsbereichs bekannter Regeleinrichtungen.Control devices for gas burners of the above type are known from the prior art, for. B. EP 0 390 964 A1, well known. In the control device described there the pressure is determined by means of a membrane, ie pneumatically. Depending on this pressure measurement, the gas flow is regulated by the gas valve. However, this pneumatic path has a variety of disadvantages, all of them restrict the scope of known control devices. That's how they limit you Hysteresis characteristics of the membrane and that between the membrane and the gas valve acting forces the work area and thus the scope. Furthermore causes the interaction between the required small restoring forces and the Operating tolerances of the membrane due to interference such as temperature fluctuations or the like, a limitation of the scope of known Control equipment.

Weitere Regeleinrichtungen für Gasbrenner sind aus der DE 24 27 819 A1 und der DE 43 17 981 A1 bekannt.Further control devices for gas burners are known from DE 24 27 819 A1 and DE 43 17 981 A1 known.

Hiervon ausgehend liegt der vorliegenden Erfindung das Problem zu Grunde, eine Regeleinrichtung für Gasbrenner zu schaffen, die die obigen Nachteile vermeidet und damit einen größeren Anwendungsbereich aufweist.On this basis, the present invention is based on the problem, a To provide control device for gas burners, which avoids the above disadvantages and thus has a wider scope.

Dieses Problem wird durch eine Regeleinrichtung für Gasbrenner mit den Merkmalen des Anspruchs 1 gelöst. This problem is solved by a control device for gas burners with the characteristics of Claim 1 solved.

Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen und der Beschreibung. Nachfolgend werden bevorzugte Ausführungsbeispiele der Erfindung anhand der Zeichnung näher erläutert. In der Zeichnung zeigt:

Fig. 1
eine erfindungsgemäße Regeleinrichtung mit weiteren Baugruppen nach einem ersten Ausführungsbeispiel der Erfindung in schematisierter Darstellung, und
Fig. 2
eine erfindungsgemäße Regeleinrichtung mit weiteren Baugruppen nach einem zweiten Ausführungsbeispiel der Erfindung ebenfalls in schematisierter Darstellung.
Further advantageous embodiments of the invention will become apparent from the dependent claims and the description. Hereinafter, preferred embodiments of the invention will be explained in more detail with reference to the drawing. In the drawing shows:
Fig. 1
a control device according to the invention with further modules according to a first embodiment of the invention in a schematic representation, and
Fig. 2
a control device according to the invention with further modules according to a second embodiment of the invention also in a schematic representation.

Die vorliegende Erfindung betrifft Regeleinrichtungen für Gasbrenner. Einem nicht-dargestellten Brenner soll ein Gas/Luft-Gemisch zugeführt werden. Um dem nicht-dargestellten Brenner einen Gasstrom zuzuführen, ist eine erste Leitung 10 vorgesehen, die den Gasstrom zum Brenner führt. Der ersten Leitung 10 ist ein Gasventil 11 zugeordnet.The present invention relates to control devices for gas burners. One not shown Burner should be supplied to a gas / air mixture. To the non-illustrated To supply a gas flow to a burner, a first line 10 is provided, the the gas flow leads to the burner. The first line 10 is associated with a gas valve 11.

Die Zuführung der Verbrennungsluft zum nicht-dargestellten Brenner erfolgt über eine zweite Leitung 12. Die zweite Leitung 12 führt demzufolge den Verbrennungsluftstrom zum Brenner. Der zweiten Leitung 12 ist ein Gebläse 13 zugeordnet. Die Drehzahl des Gebläses 13 bestimmt den Verbrennungsluftdruck und damit den Verbrennungsluftstrom. Innerhalb der den Verbrennungsluftstrom rührenden zweiten Leitung 12 ist eine Blende oder Drosselstelle 14 angeordnet.The supply of combustion air to the burner, not shown, via a second line 12. The second line 12 thus leads the combustion air flow to the burner. The second line 12 is associated with a blower 13. The speed of the Blower 13 determines the combustion air pressure and thus the combustion air flow. Within the combustion air flow contacting second conduit 12 is an aperture or throttle 14 is arranged.

Gemäß Figuren 1, 2 mündet die den Gasstrom führende erste Leitung 10 in Strömungsrichtung der Verbrennungsluft hinter der Drosselstelle 14 in die den Verbrennungsluftstrom führende zweite Leitung 12. Eine Gasdüse 15 schließt die erste Leitung 10 im Bereich der zweiten Leitung 12 ab. In Strömungsrichtung hinter der Gasdüse 15 liegt demzufolge ein Gas/Luft-Gemisch vor.According to FIGS. 1 and 2, the first line 10 leading to the gas flow opens into Flow direction of the combustion air behind the throttle point 14 in the Combustion air flow leading second line 12. A gas nozzle 15 closes the first Line 10 in the region of the second line 12 from. In the flow direction behind the Gas nozzle 15 is therefore present before a gas / air mixture.

Bei dem in Figur 1 dargestellten Ausführungsbeispiel geht es nun darum, eine 1:1-Gas/Luft-Verbundregelung bereitzustellen, d.h. bei einer Erhöhung des Verbrennungsluftdrucks von 1 Millibar (mbar) soll der Gasdruck ebenfalls um 1mbar erhöht werden. Erfindungsgemäß ist hierzu zwischen der den Gasstrom führenden ersten Leitung 10 und der den Verbrennungsluftstrom führenden zweiten Leitung 12 ein Sensor 16 angeordnet. Der Sensor 16 ist als Differenzdruck-Sensor, insbesondere als Durchflußmesser, Anemometer oder dergleichen, ausgebildet.In the embodiment shown in Figure 1 is now about a To provide a 1: 1 gas / air composite control, i. with an increase in the Combustion air pressure of 1 millibar (mbar), the gas pressure should also by 1mbar increase. According to the invention, this is between the first leading the gas flow Line 10 and the combustion air flow leading second line 12 a sensor 16 arranged. The sensor 16 is a differential pressure sensor, in particular as Flow meter, anemometer or the like, formed.

Mit einem ersten Meßpunkt 17 ist der Sensor 16 an der den Gasstrom führenden ersten Leitung 10 angeschlossen. Mit einem zweiten Meßpunkt 18 ist der Sensor 16 an der den Verbrennungsluftstrom führenden zweiten Leitung 12 angeschlossen. In Strömungsrichtung des Gases ist der erste Meßpunkt 17 vor der Gasdüse 15 positioniert. Der zweite Meßpunkt 18 ist in Strömungsrichtung der Verbrennungsluft vor der Drosselstelle 14 angeordnet.With a first measuring point 17, the sensor 16 is at the first gas flow leading Line 10 connected. With a second measuring point 18, the sensor 16 is at the Combustion air flow leading second conduit 12 connected. In Flow direction of the gas, the first measuring point 17 is positioned in front of the gas nozzle 15. The second measuring point 18 is in the flow direction of the combustion air before Throttle 14 arranged.

Soll, wie bereits erwähnt, beim Ausführungsbeispiel gemäß Figur 1 für eine 1:1-Gas/Luft-Verbundregelung gesorgt werden, so muß der Gasdruck dem Verbrennungsluftdruck entsprechen. In dem Fall, in dem der Sensor 16 als Durchflußmesser bzw. Anemometer ausgebildet ist, bedeutet dies, daß der Durchfluß durch den Sensor 16 Null beträgt. Nimmt z.B. der Verbrennungsluftdruck gegenüber dem Gasdruck ab, so erfährt der Sensor 16 einen Durchfluß von der ersten Leitung 10 in Richtung auf die zweite Leitung 12. Nimmt hingegen der Verbrennungsluftdruck gegenüber dem Gasdruck zu, so erfährt der Sensor 16 einen Durchfluß von der zweiten Leitung 12 in Richtung auf die erste Leitung 10. Aufgrund der Durchflußmenge sowie auf Grund der Durchflußrichtung können demnach vom Sensor 16 die Druckverhältnisse zwischen Verbrennungsluftdruck und Gasdruck ermittelt werden.Should, as already mentioned, in the embodiment of Figure 1 for a 1: 1 gas / air composite control be taken care of, so the gas pressure must be the combustion air pressure correspond. In the case where the sensor 16 as a flowmeter or anemometer is formed, this means that the flow through the sensor 16 is zero. takes e.g. the combustion air pressure against the gas pressure, the sensor 16 learns a flow from the first line 10 in the direction of the second line 12. Takes however, the combustion air pressure against the gas pressure, so learns the sensor 16th a flow from the second conduit 12 in the direction of the first conduit 10th Due to the flow rate and due to the flow direction can therefore from the sensor 16, the pressure conditions between combustion air pressure and gas pressure be determined.

Der Sensor 16 erzeugt abhängig von den obigen Druckverhältnissen ein elektrisches bzw. elektronisches Signal 19, welches zur Verstellung des Gasventils 11 verwendet wird. Gemäß Figur 1 wird das elektrische bzw. elektronische Signal 19 einem Steuer- oder Regelgerät 20 zugeführt, das aus dem Signal 19 ein Regelungssignal 21 für einen dem Gasventil 11 zugeordneten Stellantrieb 22 erzeugt.The sensor 16 generates depending on the above pressure ratios an electrical or electronic signal 19, which is used to adjust the gas valve 11. According to Figure 1, the electrical or electronic signal 19 is a control or Regulator 20 is supplied, which from the signal 19, a control signal 21 for a the Gas valve 11 associated actuator 22 generates.

Mit der in Figur 1 dargestellten Regeleinrichtung folgt man demzufolge dem Verbrennungsluftdruck, um den Gasstrom durch das Gasventil 11 derart zu regulieren, daß eine 1:1-Gas/Luft-Verbundregelung erzielt wird. Detektiert der Sensor 16 zwischen Verbrennungsluftdruck und Gasdruck eine Druckdifferenz von Null, so entspricht das Signal 19 einer Druckdifferenz von Null und das Gasventil 11 kann unverändert betrieben werden. Detektiert der Sensor 16 einen gegenüber dem Gasdruck höheren Verbrennungsluftdruck, so muß mit Hilfe des vom Sensor 16 erzeugten elektrischen bzw. elektronischen Signals 19 das Gasventil 11 derart angesteuert werden, daß sich der Gasstrom erhöht. Hierzu erzeugt das Regelgerät 20 ein Regelungssignal 21 fiir den Stellantrieb 22 des Gasventils 11, derart, daß das Signal 19 wieder auf einen Betrag geführt wird, der einer Druckdifferenz von Null entspricht. Detektiert hingegen der Sensor 16 einen gegenüber dem Gasdruck verringerten Verbrennungsluftdruck, so muß mit Hilfe des vom Sensor 16 erzeugten elektrischen bzw. elektronischen Signals das Gasventil 11 derart angesteuert werden, daß sich der Gasstrom verringert.With the control device shown in Figure 1 is therefore followed by the Combustion air pressure to regulate the gas flow through the gas valve 11 such that a 1: 1 gas / air composite control is achieved. Detects the sensor 16 between Combustion air pressure and gas pressure a pressure difference of zero, so that corresponds Signal 19 a pressure difference of zero and the gas valve 11 can operate unchanged become. Detects the sensor 16 a higher than the gas pressure Combustion air pressure, so must with the help of the generated by the sensor 16 electrical or electronic signal 19, the gas valve 11 are driven so that the Gas flow increased. For this purpose, the control unit 20 generates a control signal 21 for the Actuator 22 of the gas valve 11, such that the signal 19 again led to an amount which corresponds to a pressure difference of zero. On the other hand, the sensor 16 detects a reduced compared to the gas pressure combustion air pressure, so must with the help of From the sensor 16 generated electrical or electronic signal, the gas valve 11 so be controlled so that the gas flow decreases.

Das Gasventil 11 kann beliebig ausgebildet sein. Im einfachsten Fall wird der Stellantrieb 22 des Gasventils 11 derart gesteuert bzw. geregelt, daß das Gasventil 11 zwischen den Zuständen An/Aus bzw. Auf/Zu hin- und herschaltet. Bei einem gegenüber dem Gasdruck höheren Verbrennungsluftdruck wird demzufolge ein Regelungssignal 21 erzeugt werden, auf Grund dessen der Stellantrieb 22 das Gasventil 11 öffnet bzw. aktiviert. Bei einem gegenüber dem Gasdruck geringeren Verbrennungsluftdruck hingegen wird aufgrund des Regelungssignals 21 der Stellantrieb 22 das Gasventil 11 hingegen schließen bzw. deaktivieren. Ein sich hieraus ergebendes oszillierendes Signal gibt Auskunft über die ordnungsgemäße Arbeitsweise des Regelungssystems und kann demzufolge als Sicherheitssignal verwendet werden. Solange wie das oszillierende Sensorsignal vorliegt, kann ein dem Gasventil 11 vorgeschaltetes, nicht-dargestelltes Sicherheitsventil aktiviert bzw. geöffnet sein.The gas valve 11 can be configured as desired. In the simplest case, the actuator 22 of the gas valve 11 is controlled such that the gas valve 11 between the States On / Off or On / Off toggles. At one compared to the gas pressure higher combustion air pressure will consequently produce a control signal 21, on the basis of which the actuator 22, the gas valve 11 opens or activates. At a in contrast to the gas pressure lower combustion air pressure is due to the Control signal 21 of the actuator 22, the gas valve 11, however, close or deactivate. A resulting oscillating signal provides information about the proper functioning of the regulatory system and can therefore be considered Safety signal can be used. As long as the oscillating sensor signal is present, can a gas valve 11 upstream, not shown safety valve activated or be open.

In Abweichung hiervon ist es auch möglich, das Gasventil 11 derart anzusteuern, daß das Gasventil 11 zwischen den Zuständen An/Aus bzw. Auf/Zu beliebige Öffnungsstellungen einnehmen kann.In a departure from this, it is also possible to control the gas valve 11 such that the Gas valve 11 between the states on / off or open / close to any opening positions can take.

Die in Figur 1 dargestellte Regeleinrichtung kann in dem Fall, in dem das Gasventil 11 geschlossen ist, zur Luftmengenmessung verwendet werden. Diese gibt sich aus dem Umstand, daß der Sensor 16 mit dem zweiten Meßpunkt 18 an der zweiten Leitung 12, nämlich in Strömungsrichtung der Verbrennungsluft vor der Drosselstelle 14, angeordnet ist; und weiterhin der Sensor 16 mit dem ersten Meßpunkt 17 an der ersten Leitung 10, also bei geschlossenem Gasventil 11 über die Gasdüse 15 in Strömungsrichtung der Verbrennungsluft nach der Drosselstelle 14 angeordnet ist. Bei geschlossenem Gasventil 11 kann demnach mit Hilfe des Sensors 16 die Druckdifferenz über die Drosselstelle 14 bestimmt und somit eine Luftmengenmessung durchgeführt werden.The control device shown in Figure 1, in the case in which the gas valve 11th is closed, used for air flow measurement. This gives itself from the In that the sensor 16 is connected to the second measuring point 18 on the second line 12, namely in the flow direction of the combustion air in front of the throttle point 14, arranged is; and furthermore the sensor 16 with the first measuring point 17 on the first line 10, ie with closed gas valve 11 via the gas nozzle 15 in the flow direction of the Combustion air is arranged after the throttle point 14. With closed gas valve 11 can therefore with the aid of the sensor 16, the pressure difference across the throttle point 14th determined and thus an air flow measurement are performed.

Die Luftmengenmessung kann verwendet werden, um den Parameterbereich des Gebläses 13 in Abhängigkeit von einer Konfiguration der Verbrennungsluft-Zufuhr und Rauchgas-Abfuhr einzustellen. Auch dient die Luftmengenmessung der Überwachung und Einstellung einer minimalen Verbrennungsluft-Zuführ, die zum sicheren Anfahren des Gasbrenners benötigt wird.Air flow metering can be used to control the parameter range of the blower 13 depending on a configuration of the combustion air supply and flue gas discharge adjust. Also, the air flow measurement of the monitoring and Setting a minimum combustion air supply, which ensures the safe start of the Gas burner is needed.

Bei der Regeleinrichtung des Ausführungsbeispiels gemäß Figur 2 kann gegenüber dem Ausführungsbeispiel gemäß Figur 1 ein abweichendes Übersetzungsverhältnis zwischen Gasstrom und Luftstrom realisiert werden, also eine 1:N-Gas/Luft-Verbundregelung. Hierzu ist zwischen der den Gasstrom führenden ersten Leitung 10 und der den Verbrennungsluftstrom führenden zweiten Leitung 12 eine Koppelleitung 23 vorgesehen, wobei innerhalb der Koppelleitung 23 zwei Einschnürungen 24, 25 angeordnet sind. Bei den Einschnürungen 24, 25 handelt es sich um Drosselstellen.In the control device of the embodiment of Figure 2 can be compared to the Embodiment of Figure 1 a different ratio between Gas flow and air flow can be realized, so a 1: N gas / air composite control. For this purpose, between the gas flow leading first line 10 and the Combustion air flow leading second line 12 a coupling line 23 is provided wherein within the coupling line 23 two constrictions 24, 25 are arranged. at the constrictions 24, 25 are throttling points.

Die Position der Einschnürungen 24, 25 in der Koppelleitung 23 in bezug auf die Leitungen 10, 12 ist von untergeordneter Bedeutung. Der Strömungswiderstand der Leitungen muß jedoch merklich geringer sein als der Strömungswiderstand der Einschnürungen 24, 25.The position of the constrictions 24, 25 in the coupling line 23 with respect to the Lines 10, 12 is of minor importance. The flow resistance of However, lines must be significantly lower than the flow resistance of Constrictions 24, 25.

Die Koppelleitung 23 ist gemäß Figur 2 an die den Verbrennungsluftstrom führende zweite Leitung 12 in Strömungsrichtung der Verbrennungsluft nach bzw. hinter der Drosselstelle 14 angeschlossen. An die den Gasstrom führende erste Leitung 10 hingegen ist die Koppelleitung 23 in Strömungsrichtung des Gases vor der Gasdüse 15 angeschlossen.The coupling line 23 is shown in FIG 2 to the combustion air flow leading second Line 12 in the flow direction of the combustion air to or behind the throttle point 14 connected. On the other hand, the leading to the gas flow first line 10 is the Coupling line 23 connected in the flow direction of the gas in front of the gas nozzle 15.

Beim Ausführungsbeispiel gemäß Figur 2 ist der Sensor 16 - ebenfalls wie beim Ausführungsbeispiel gemäß Figur 1 - zwischen der ersten Leitung 10 und der zweiten Leitung 12 angeordnet. Beim Ausführungsbeispiel gemäß Figur 2 ist jedoch der erste Meßpunkt 17 im Bereich der Koppeleitung 23 zwischen den Einschnürungen 24, 25 angeordnet. Der zweite Meßpunkt 18 ist wiederum im Bereich der zweiten Leitung 12 in Strömungsrichtung der Verbrennungsluft vor der Drosselstelle 14 angeordnet.In the embodiment according to FIG. 2, the sensor 16 is likewise in the same way as in FIG Embodiment according to Figure 1 - between the first line 10 and the second Line 12 is arranged. In the embodiment of Figure 2, however, is the first Measuring point 17 in the region of the coupling line 23 between the constrictions 24, 25th arranged. The second measuring point 18 is again in the region of the second line 12 in FIG Flow direction of the combustion air upstream of the throttle point 14 is arranged.

Auch bei dem Ausführungsbeispiel gemäß Figur 2 erzeugt das Regelgerät 20 ein Regelungssignal 21 für den Stellantrieb 22 des Gasventils 11, derart, daß das Signal 19 des Sensors 16 auf einen Betrag geführt wird, der einer Druckdifferenz von Null entspricht. Durch die Anordnung der Koppelleitung 23 mit den Einrichtungen 21, 25 ist jedoch dadurch eine 1:N-Gas/Luft-Verbundregelung realisierbar, d.h. daß bei einer Erhöhung des Verbrennungsluftdrucks von 1 mbar der Gasdruck um N mbar erhöht wird.Also in the embodiment of Figure 2, the controller 20 generates a Control signal 21 for the actuator 22 of the gas valve 11, such that the signal 19 of the Sensor 16 is guided to an amount corresponding to a pressure difference of zero. However, the arrangement of the coupling line 23 with the devices 21, 25 is thereby realizing a 1: N gas / air composite control, i. that with an increase in the Combustion air pressure of 1 mbar, the gas pressure is increased by N mbar.

Mit der Regeleinrichtung gemäß Figur 2 ist demzufolge eine 1:N-Gas/Luft-Verbundregelung möglich. Mit anderen Worten kann bei dem Ausführungsbeispiel gemäß Figur 2 der Gasdruck in bezug auf den Verbrennungsluftdruck verstärkt werden. Der Grad der Verstärkung wird durch die Einschnürungen 24, 25 bestimmt.With the control device according to Figure 2 is therefore a 1: N gas / air composite control possible. In other words, in the embodiment according to Figure 2, the gas pressure in relation to the combustion air pressure are amplified. The degree the gain is determined by the constrictions 24, 25.

Desweiteren sei darauf hingewiesen, daß eine der Einschnürungen 24, 25 variabel bzw. veränderbar ausgebildet sein kann. In diesem Fall ist es möglich, durch Veränderung bzw. Verstellung einer Einschnürung 24 bzw. 25 das Übersetzungsverhältnis zwischen Verbrennungsluftstrom und Gasstrom bzw. die Verstärkung zu variieren. Furthermore, it should be noted that one of the constrictions 24, 25 variable or can be made changeable. In this case, it is possible, by change or Adjustment of a constriction 24 or 25 the ratio between Combustion air flow and gas flow or to vary the gain.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

1010
Leitungmanagement
1111
Gasventilgas valve
1212
Leitungmanagement
1313
Gebläsefan
1414
Drosselstellerestriction
1515
Gasdüsegas nozzle
1616
Sensorsensor
1717
Meßpunktmeasuring point
1818
Meßpunktmeasuring point
1919
Signalsignal
2020
Regelgerätregulator
2121
Regelungssignalcontrol signal
2222
Stellantriebactuator
2323
Koppelleitungcoupling line
2424
Einschnürungconstriction
2525
Einschnürungconstriction

Claims (6)

  1. Regulating device for a gas burner for preparing a gas/air mixture, namely to supply a gas flow and a combustion air flow to a burner, the gas flow being adjustable by a gas valve (11) in dependence on the combustion air pressure, a sensor (16) being arranged between a first line (10) guiding the gas flow and a second line (12) guiding the combustion air flow, said sensor (16) being coupled to a first measuring point (17) on the first line (10) guiding the gas flow and to a second measuring point (18) on the second line (12) guiding the combustion air flow, and an electric or electronic signal (19) generated by the sensor being used to regulate the gas valve (11), characterised in that
    a) the first measuring point (17) is arranged before a gas jet (15) in the flow direction of the gas and the second measuring point (18) is arranged before a throttling point (14) in the flow direction of the combustion air, the gas jet (15) opening out behind the throttling point (14), in the flow direction of the combustion air, into the second line (12) guiding the combustion air flow,
    b) the sensor (16) is designed as a flowmeter.
  2. Regulating device according to claim 1, characterised in that a regulating signal (21) for an actuator (22) associated with the gas valve (11) is generated in dependence on the electric or electronic signal (19) generated by the flowmeter (16).
  3. Regulating device according to claim 1 or 2, characterised by a coupling line (23) extending between the first line (10) and the second line (12), preferably two constrictions (24, 25) being arranged inside the coupling line (23).
  4. Regulating device according to claim 3, characterised in that the coupling line (23) is coupled to the second line (12) guiding the combustion air flow after the throttling point (14) in the flow direction of the combustion air, and in that the coupling line (23) is coupled to the first line (10) guiding the gas flow before the gas jet (15) in the flow direction of the gas.
  5. Regulating device according to one or more of claims 3 or 4, characterised in that the first measuring point (17) is arranged in the region of the coupling line (23) between the first constriction (24) and the second constriction (25), and the second measuring point (18) is arranged in the region of the second line (10) before the throttling point (14) in the flow direction of the combustion air.
  6. Regulating device according to one or more of claims 3 to 5, characterised in that at least one of the constrictions (24, 25) is configured adjustable or variable.
EP99955316A 1998-06-02 1999-05-27 Gas burner regulating system Expired - Lifetime EP1084369B1 (en)

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DE19824521 1998-06-02
DE19824521A DE19824521B4 (en) 1998-06-02 1998-06-02 Control device for gas burners
PCT/EP1999/003670 WO1999063272A1 (en) 1998-06-02 1999-05-27 Gas burner regulating system

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JP (1) JP2002517702A (en)
KR (1) KR20010071151A (en)
CA (1) CA2321659A1 (en)
DE (2) DE19824521B4 (en)
DK (1) DK1084369T3 (en)
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EP1962067A2 (en) 2007-02-19 2008-08-27 Vaillant GmbH Method for calibrating a flow sensor with one or two temperature-sensitive resistances
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ITPD20120030A1 (en) * 2012-02-09 2013-08-10 Sit La Precisa S P A Con Socio Uni Co METHOD FOR THE CONTROL OF A BURNER OF A BOILER AND CONTROL SYSTEM OPERATING IN ACCORDANCE WITH THIS METHOD
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CA2321659A1 (en) 1999-12-09
DE59904050D1 (en) 2003-02-20
JP2002517702A (en) 2002-06-18
EP1084369A1 (en) 2001-03-21
WO1999063272A1 (en) 1999-12-09
DE19824521B4 (en) 2004-12-23
KR20010071151A (en) 2001-07-28
US6561791B1 (en) 2003-05-13
ES2186419T3 (en) 2003-05-01
DE19824521A1 (en) 1999-12-09
DK1084369T3 (en) 2003-03-03

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