EP0390964B1 - Control device for gas burners - Google Patents

Control device for gas burners Download PDF

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Publication number
EP0390964B1
EP0390964B1 EP89114136A EP89114136A EP0390964B1 EP 0390964 B1 EP0390964 B1 EP 0390964B1 EP 89114136 A EP89114136 A EP 89114136A EP 89114136 A EP89114136 A EP 89114136A EP 0390964 B1 EP0390964 B1 EP 0390964B1
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EP
European Patent Office
Prior art keywords
gas
valve
control
diaphragm
pressure
Prior art date
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Application number
EP89114136A
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German (de)
French (fr)
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EP0390964B2 (en
EP0390964A2 (en
EP0390964A3 (en
Inventor
Enno Jan Vrolijk
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Honeywell BV
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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
    • F23N1/00—Regulating fuel supply
    • F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water
    • F23N1/10—Regulating fuel supply conjointly with another medium, e.g. boiler water and with air supply or draught
    • F23N1/107—Regulating fuel supply conjointly with another medium, e.g. boiler water and with air supply or draught using mechanical 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
    • F23N1/027—Regulating fuel supply conjointly with air supply using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water
    • F23N1/10—Regulating fuel supply conjointly with another medium, e.g. boiler water and with air supply or draught
    • 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
    • F23N2005/182—Air flow switch
    • 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
    • F23N2005/185—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F23N2225/06—Measuring pressure for determining flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/19—Measuring temperature outlet temperature water heat-exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F23N2233/08—Ventilators at the air intake with variable speed
    • 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
    • F23N2235/20—Membrane valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2239/00—Fuels
    • F23N2239/04—Gaseous fuels

Definitions

  • the invention relates to a control device according to the preamble of claim 1.
  • the control module consists of a pressure transducer which converts the differential pressure into a higher proportional pressure, which is then arranged in the gas supply line to the burner Gas pressure regulator acts.
  • the supply pressure for the pressure transducer can be taken directly from the gas or air line.
  • the pressure transducer contains a membrane exposed to the differential pressure and acted on one side with the force of a compensating spring, to which a tappet acting on a spring-loaded transmission lever is attached.
  • the transmission lever which is equipped with an adjustable slide, acts on a pneumatic force switch, the output signal of which is fed as a control variable to the gas pressure regulator mentioned.
  • a temperature sensor controls the main valve of a gas control device via a servo pressure controller, the control pressure simultaneously adjusting a throttle valve in the combustion air supply line in the same direction as the gas valve via a separate diaphragm drive.
  • the combustion air supply line is not connected to the burner, but to the bottom area of the combustion chamber, and the differential pressure proportional to the combustion air supply is between a nozzle arranged in the combustion air supply line and an generated the bottom area of the combustion chamber connected line.
  • Both control pressure lines open on both sides of the membrane of the control module in its membrane chambers, and the membrane adjusts the closing body of the gas control valve.
  • EP-A 0 275 568 shows a gas-operated water heater, in which there is an orifice in the combustion air supply line, in front of and behind which connected pressure lines on both sides of a control membrane open into the membrane chambers of a control module and the control membrane acts on a gas pressure regulator via a tappet.
  • the fan In a burner control known from US-A 37 41 710, the fan is located in the common gas / air supply line, and the amount of air is controlled by an air flap arranged in the air intake line depending on the heat requirement.
  • the air pressure behind the flap influences the position of the fuel gas valve via a diaphragm drive.
  • the object of the invention is to improve a control device of the type mentioned with regard to its function and also its safety.
  • This is achieved by the invention characterized in claim 1.
  • the control module generates a sufficiently high pneumatic actuating signal for the diaphragm drive of the gas control valve even when there is little air draft and thus low differential pressure due to its amplifying effect.
  • this ensures that the amount of gas fed in is proportionally tracked by the amount of air, even with a low throughput, and thus the best possible combustion is also ensured in this case.
  • Advantageous embodiments of the invention result from the dependent claims.
  • a heat exchanger 1 is connected via a flow line 2 and a return line 3 to a consumer, not shown.
  • a temperature sensor 4 measures the flow temperature of the hot water supplied to the consumer and delivers a corresponding signal to the actual value input 5 of the temperature controller 6.
  • This receives a signal corresponding to the desired temperature at its setpoint input 7, for example from a manual adjuster.
  • it controls the energy supply to the motor 8 of the fan 9 via a converter.
  • the compressed air is fed to the burner 11 via the air duct 10, which, like the heat exchanger 1, is arranged in an otherwise closed combustion chamber 12.
  • the exhaust gases leave the combustion chamber 12 through the flue gas discharge 13.
  • the gas to be burned is fed from a gas control valve 15 to a gas nozzle 14 in the feed line 10 to the burner 11.
  • the gas control valve ent speaks in its structure, for example, the combination valve V4700 from the applicant.
  • a main valve is connected between its inlet 26 and its outlet 27, which consists of a closing body 28 and a valve seat 29.
  • the closing body 28 is biased in the closing direction via a valve rod 30 and a spring 31.
  • the valve rod bears against the working diaphragm 32 of the servo pressure regulator.
  • the closing body 35 of a closing solenoid valve is switched from the rest position shown to the opposite position by means of a magnetic drive 33 and the spring-loaded actuating rod 34. It then closes the passage 36.
  • gas passes from the inlet 26 through a throttle 37 into the space 38 and from there into the diaphragm chamber 39 of the main valve 28 to 32.
  • the pressure in the drive chamber 39 moves the diaphragm 32 downward and opens the main valve 28, 29. Gas thus passes from inlet 26 to outlet 27 and from there via line 40 to gas nozzle 14 on burner 11.
  • the pressure at the outlet 27 of the gas control valve is simultaneously supplied via the channel 41 to the chamber 42 on the side of the control membrane 43 carrying the closing body 21 facing away from the control membrane 18.
  • a spring 54 which serves to adjust the zero point acts on the control diaphragm 18 and is supported on the housing side by an adjusting screw 52. By adjusting this adjusting screw 52 in the thread of the bushing 53, the force exerted by the spring 54 on the control membrane 18 can be changed.
  • the pressure at the outlet 27 passes through the channel 44 into the chamber 45 below the diaphragm 49.
  • This carries a closing body 50 which interacts with a valve seat 51.
  • a pressure spring 47 acts on the diaphragm 49 in the closing direction of this servo valve, which is located on the housing side via a Adjusting screw 46 is supported in the thread of the socket 48.
  • the maximum gas pressure can be set and limited with the adjusting screw 46.
  • the servo pressure regulator consisting of diaphragm 49, spring 47 and closing body 50 in connection with the seat 51, is used as in the aforementioned valve series V4700 to limit the maximum gas pressure.
  • the closing force of the closing body 50 on the seat 51 is set higher with the spring 47, all the closing force of the closing body 21 on the seat 22.
  • the second servo valve formed by the control membrane 43, the closing body 21 and the seat 22 in connection with the springs 20 and 54 serves to set the zero point for the control curve of air and gas volume.
  • the valve seat 22 of the servo valve 21, 22 is connected to the chamber 38 via the line 55. It has the same pressure on it as it acts in the chamber 39 on the membrane 32 of the drive for the main valve 28, 29. If the pressure at the outlet 27 and thus in the channels 41 and 44 increases and the force generated by it by means of the control membrane 43 overcomes that which acts on the membrane 18 from the opposite side through the spring 20, the closing body 21 lifts from the valve seat 22 and the working pressure in the chamber 38 can be reduced via the line 55, the valve seat 22, the chamber 42 and the channel 41 to the outlet 27. This is the usual process of regulating a servo pressure regulator. This pressure is controlled by the pressure difference on the lines 16 and 17 and thus as a function of the air throughput in the air supply duct 10.
  • the amount of gas supplied to the burner 11 via the nozzle 14 is therefore continuously tracked to the amount of air conveyed by the blower 9.
  • the area ratio of the membranes 18 and 43 determines the gain factor of the control module 19.
  • the on-off valve 35, 36 returns to the rest position shown in the drawing under the force of its closing spring, and the control pressure in the chamber 38 is reduced via the valve seat 36 to the outlet 27.
  • the main valve 28, 29 closes.
  • the control module 19 is arranged as close as possible to the gas control valve 15.
  • the use of a separate control module, which is not integrated in the gas control valve, has the advantage that it can either be replaced the diaphragms 18 and / or 43 or by exchanging the control module itself to set different gain factors of the control module and thus the control device can adapt to the particular circumstances of the burner system and combustion chamber without changes to the gas control valve.
  • the considerable gain and the resulting high closing force of the closing body 21 ensures reliable pressure control of the gas control valve.
  • the arrangement of the amplifier or control membrane 18 and the control membrane 43 close to each other in a special control module 19 leads to improved control properties and increased stability of the outlet pressure of the gas control valve.
  • the latter can be designed as a standard device for different applications and, depending on the type of application, is combined with a correspondingly dimensioned control module. Since the area of the membranes 18 and 43 can be freely selected, relatively high amplification factors can be achieved. For reasons of space alone, this would not be possible if these membranes were integrated in the gas control valve.
  • the control module can be arranged anywhere alongside the gas control valve. In particular when using flexible connecting cables, the control module can be accommodated in a heater at the point where there is sufficient space available. It can also be easily adjusted and adjusted there.
  • the flexible line connection of the control module to the air supply duct 10 makes it possible to choose the cheapest and most suitable location for the inputs 23 and 56 for a stable mode of operation.
  • this maximum pressure can also be limited by limiting the maximum stroke of the control membrane 18 by an adjustable stop.

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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)

Description

Die Erfindung betrifft eine Regeleinrichtung gemäß Gattungsbegriff des Anspruchs 1. Bei einer aus EP-A 0 015 480 bekannten Regeleinrichtung dieser Art besteht der Steuermodul aus einem Druckwandler, welcher den Differenzdruck in einen höheren Proportionaldruck umwandelt, der dann auf einen in der Gaszufuhrleitung zum Brenner angeordneten Gasdruckregler einwirkt. Der Versorgungsdruck für den Druckwandler kann direkt aus der Gas- oder der Luftleitung entnommen werden. Der Druckwandler enthält eine dem Differenzdruck ausgesetzte und einseitig mit der Kraft einer Ausgleichsfeder beaufschlagte Membran, an welcher ein auf einen federbelasteten Übersetzungshebel einwirkender Stößel befestigt ist. Der mit einem verstellbaren Schieber ausgestattete Übersetzungshebel wirkt auf einen pneumatischen Kraftschalter ein, dessen Ausgangssignal als Steuergröße dem erwähnten Gasdruckregler zugeleitet wird.The invention relates to a control device according to the preamble of claim 1. In a control device of this type known from EP-A 0 015 480, the control module consists of a pressure transducer which converts the differential pressure into a higher proportional pressure, which is then arranged in the gas supply line to the burner Gas pressure regulator acts. The supply pressure for the pressure transducer can be taken directly from the gas or air line. The pressure transducer contains a membrane exposed to the differential pressure and acted on one side with the force of a compensating spring, to which a tappet acting on a spring-loaded transmission lever is attached. The transmission lever, which is equipped with an adjustable slide, acts on a pneumatic force switch, the output signal of which is fed as a control variable to the gas pressure regulator mentioned.

In einer aus DE-OS 30 10 737 bekannten Regeleinrichtung steuert ein Temperaturfühler über einen Servodruckregler das Hauptventil eines Gasregelgeräts, wobei der Steuerdruck zugleich über einen getrennten Membranantrieb eine Drosselklappe in der Verbrennungsluftzuleitung gleichsinnig mit dem Gasventil verstellt.In a control device known from DE-OS 30 10 737, a temperature sensor controls the main valve of a gas control device via a servo pressure controller, the control pressure simultaneously adjusting a throttle valve in the combustion air supply line in the same direction as the gas valve via a separate diaphragm drive.

Bei einer in der prioritätsälteren EP-A 0 326 880 beschriebenen Regeleinrichtung der eingangs genannten Art ist die Verbrennungsluftzuleitung nicht an den Brenner angeschlossen, sondern an den Bodenbereich der Brennkammer, und der der Brennluftzufuhr proportionale Differenzdruck wird zwischen einer in der Brennluftzufuhrleitung angeordneten Düse und einer an den Bodenbereich der Brennkammer angeschlossenen Leitung erzeugt. Beide Steuerdruckleitungen münden zu beiden Seiten der Membran des Steuermoduls in dessen Membrankammern, und die Membran verstellt den Schließkörper des Gasregelventils.In a control device of the type mentioned in the priority EP-A 0 326 880, the combustion air supply line is not connected to the burner, but to the bottom area of the combustion chamber, and the differential pressure proportional to the combustion air supply is between a nozzle arranged in the combustion air supply line and an generated the bottom area of the combustion chamber connected line. Both control pressure lines open on both sides of the membrane of the control module in its membrane chambers, and the membrane adjusts the closing body of the gas control valve.

Bei einer aus DE-A 34 01 665 bekannten Regeleinrichtung für Gasheizgeräte befindet sich ebenso wie bei der Heizvorrichtung gemäß EP-A 0 044 670 eine ein Strömungssignal erzeugende Differenzdruckmeßstelle mit einer Meßblende im Rauchgasabzug. Der dort erzeugte Differenzdruck wirkt auf die beiden Seiten einer Membran ein, die über einen Stößel einen in einem Schneidenlager versetzbar gelagerten Übertragungshebel steuert. Dessen dem Stößel abgewandtes Ende verstellt über eine Feder den Schließkörper des Gasregelventils.In a control device for gas heating devices known from DE-A 34 01 665, just as in the heating device according to EP-A 0 044 670, there is a differential pressure measuring point which generates a flow signal and has a measuring orifice in the flue gas outlet. The differential pressure generated there acts on the two sides of a membrane, which controls a transfer lever which is displaceably mounted in a cutting edge bearing via a tappet. Its end facing away from the tappet adjusts the closing body of the gas control valve via a spring.

Weiterhin ist aus DE-AS 31 47 857 eine Regeleinrichtung bekannt, bei der ein den Wärmebedarf messender Temperaturfühler über einen Servodruckregler auf ein einem Gebläse nachgeschaltetes Luftregelventil einwirkt und der Steuerdruck dieses auf dem Luftregelventil angeordneten Servodruckreglers über eine Verbindungsleitung zugleich dem Membranantrieb des Gasventils zugeführt wird. EP-A 0 275 568 Zeigt einen gasbetriebenen Warmwasserbereiter, bei dem in der Brennluftzuleitung eine Blende liegt, vor und hinter dieser angeschlossene Druckleitungen zu beiden Seiten einer Steuermembran in die Membrankammern eines Steuermoduls münden und die Steuermembran über einen Stößel auf einen Gasdruckregler einwirkt. Bei einer aus US-A 37 41 710 bekannten Brennersteuerung liegt das Gebläse in der gemeinsamen Gas/Luftzuleitung, und die Luftmenge wird durch eine in der Luftansaugleitung angeordnete Luftklappe in Abhängigkeit vom Wärmebedarf gesteuert. Der hinter der Klappe auftretende Luftdruck beeinflußt über einen Membranantrieb die Stellung des Brenngasventils.Furthermore, from DE-AS 31 47 857 a control device is known in which a temperature sensor measuring the heat requirement acts on an air control valve connected downstream of a blower via a servo pressure controller and the control pressure of this servo pressure controller arranged on the air control valve is simultaneously fed to the diaphragm drive of the gas valve via a connecting line. EP-A 0 275 568 shows a gas-operated water heater, in which there is an orifice in the combustion air supply line, in front of and behind which connected pressure lines on both sides of a control membrane open into the membrane chambers of a control module and the control membrane acts on a gas pressure regulator via a tappet. In a burner control known from US-A 37 41 710, the fan is located in the common gas / air supply line, and the amount of air is controlled by an air flap arranged in the air intake line depending on the heat requirement. The air pressure behind the flap influences the position of the fuel gas valve via a diaphragm drive.

Aufgabe der Erfindung ist es, eine Regeleinrichtung der eingangs genannten Art hinsichtlich ihrer Funktion und auch ihrer Sicherheit zu verbessern. Dies gelingt durch die im Anspruch 1 gekennzeichnete Erfindung. Infolge der Verwendung eines vom strömungsabhängigen Differenzdruck in der Brennluftzuleitung gesteuerten Servodruckreglers erzeugt der Steuermodul auch bei geringem Luftzug und damit geringem Differenzdruck infolge seiner Verstärkerwirkung ein ausreichend hohes pneumatisches Stellsignal für den Membranantrieb des Gasregelventils. Dies gewährleistet gleichzeitig, daß die zugeführte Gasmenge der Luftmenge auch bei geringem Durchsatz proportional nachgeführt und somit auch in diesem Fall eine möglichst optimale Verbrennung gewährleistet ist. Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den abhängigen Ansprüchen.The object of the invention is to improve a control device of the type mentioned with regard to its function and also its safety. This is achieved by the invention characterized in claim 1. As a result of the use of a servo pressure regulator controlled by the flow-dependent differential pressure in the combustion air supply line, the control module generates a sufficiently high pneumatic actuating signal for the diaphragm drive of the gas control valve even when there is little air draft and thus low differential pressure due to its amplifying effect. At the same time, this ensures that the amount of gas fed in is proportionally tracked by the amount of air, even with a low throughput, and thus the best possible combustion is also ensured in this case. Advantageous embodiments of the invention result from the dependent claims.

Die Erfindung wird nachfolgend anhand eines in der Zeichnung schematisch dargestellten Ausführungsbeispiels erläutert. Ein Wärmeaustauscher 1 ist über eine Vorlaufleitung 2 und eine Rücklaufleitung 3 mit einem nicht dargestellten Verbraucher verbunden. Ein Temperaturfühler 4 mißt die Vorlauftemperatur des dem Verbraucher zugeführten Heißwassers und liefert ein entsprechendes Signal an den Istwerteingang 5 des Temperaturreglers 6. Dieser erhält an seinem Sollwerteingang 7, beispielsweise von einem Handeinsteller ein der gewünschten Temperatur entsprechendes Signal. Er steuert beispielsweise über einen Umrichter die Energiezufuhr zum Motor 8 des Gebläses 9. Die Druckluft wird über den Luftkanal 10 dem Brenner 11 zugeleitet, der ebenso wie der Wärmetauscher 1 in einer ansonsten geschlossenen Brennkammer 12 angeordnet ist. Die Abgase verlassen die Brennkammer 12 durch den Rauchgasabzug 13. Einer Gasdüse 14 in der Zuleitung 10 zum Brenner 11 wird von einem Gasregelventil 15 her das zu verbrennende Gas zugeleitet. Das Gasregelventil entspricht in seinem Aufbau beispielsweise dem Kombinationsventil V4700 der Anmelderin.The invention is explained below with reference to an embodiment shown schematically in the drawing. A heat exchanger 1 is connected via a flow line 2 and a return line 3 to a consumer, not shown. A temperature sensor 4 measures the flow temperature of the hot water supplied to the consumer and delivers a corresponding signal to the actual value input 5 of the temperature controller 6. This receives a signal corresponding to the desired temperature at its setpoint input 7, for example from a manual adjuster. For example, it controls the energy supply to the motor 8 of the fan 9 via a converter. The compressed air is fed to the burner 11 via the air duct 10, which, like the heat exchanger 1, is arranged in an otherwise closed combustion chamber 12. The exhaust gases leave the combustion chamber 12 through the flue gas discharge 13. The gas to be burned is fed from a gas control valve 15 to a gas nozzle 14 in the feed line 10 to the burner 11. The gas control valve ent speaks in its structure, for example, the combination valve V4700 from the applicant.

Bei abgeschaltetem Gebläse 9 herrscht auf den Druckmeßleitungen 16 und 17 der gleiche Druck und damit auch zu beiden Seiten der relativ großflächigen Steuermembran 18 des Steuermoduls 19. An der Membran 18 stützt sich eine Druckfeder 20 ab, welche den Schließkörper 21 des Servoventils gegen dessen Sitz 22 drückt. Das Servoventil 21, 22 wird folglich mit der Kraft der Feder 20 geschlossen gehalten. Bei Einschaltung des Gebläses 9 nimmt der Druck am Eingang 56 der Leitung 16 zu und der Druck in der an die Düse 23 angeschlossenen Leitung 17 ab. Folglich wirkt eine die Kraft der jeder 20 unterstützende Kraft auf die Membran 18 ein. In der Kammer 24 links von der Membran 18 herrscht ein höherer Druck als in der Kammer 25 rechts von dieser Membran. Das Servoventil 21, 22 bleibt also erst recht geschlossen.When the fan 9 is switched off, the same pressure prevails on the pressure measuring lines 16 and 17 and therefore also on both sides of the relatively large-area control membrane 18 of the control module 19. A compression spring 20 is supported on the membrane 18, which compresses the closing body 21 of the servo valve against its seat 22 presses. The servo valve 21, 22 is consequently kept closed with the force of the spring 20. When the fan 9 is switched on, the pressure at the inlet 56 of the line 16 increases and the pressure in the line 17 connected to the nozzle 23 decreases. Consequently, a force supporting the force of each 20 acts on the membrane 18. In the chamber 24 to the left of the membrane 18 there is a higher pressure than in the chamber 25 to the right of this membrane. The servo valve 21, 22 therefore remains closed.

Im Gasregelventil 15 ist zwischen dessen Einlaß 26 und dessen Auslaß 27 ein Hauptventil eingeschaltet, welches aus einem Schließkörper 28 und einem Ventilsitz 29 besteht. Der Schließkörper 28 ist über eine Ventilstange 30 und eine Feder 31 in Schließrichtung vorgespannt. Die Ventilstange liegt an der Arbeitsmembran 32 des Servodruckreglers an. Bei Wärmebedarf wird über einen Magnetantrieb 33 und die federnd vorgespannte Betätigungsstange 34 der Schließkörper 35 eines Einschaltmagnetventils aus der dargestellten Ruhelage in die gegenüberliegende Position umgeschaltet. Er schließt dann den Durchlaß 36. Gleichzeitig gelangt Gas vom Einlaß 26 über eine Drosselstelle 37 in den Raum 38 und von dort in die Membrankammer 39 des Hauptventils 28 bis 32. Der Druck in der Antriebskammer 39 bewegt die Membran 32 nach unten und öffnet das Hauptventil 28, 29. Damit gelangt Gas vom Einlaß 26 zum Auslaß 27 und von dort über die Leitung 40 zur Gasdüse 14 am Brenner 11.In the gas control valve 15, a main valve is connected between its inlet 26 and its outlet 27, which consists of a closing body 28 and a valve seat 29. The closing body 28 is biased in the closing direction via a valve rod 30 and a spring 31. The valve rod bears against the working diaphragm 32 of the servo pressure regulator. If heat is required, the closing body 35 of a closing solenoid valve is switched from the rest position shown to the opposite position by means of a magnetic drive 33 and the spring-loaded actuating rod 34. It then closes the passage 36. At the same time, gas passes from the inlet 26 through a throttle 37 into the space 38 and from there into the diaphragm chamber 39 of the main valve 28 to 32. The pressure in the drive chamber 39 moves the diaphragm 32 downward and opens the main valve 28, 29. Gas thus passes from inlet 26 to outlet 27 and from there via line 40 to gas nozzle 14 on burner 11.

Der Druck am Auslaß 27 des Gasregelventils wird über den Kanal 41 zugleich der Kammer 42 auf der der Steuermembran 18 abgewandten Seite der den Schließkörper 21 tragenden Regelmembran 43 zugeführt. Auf die Steuermembran 18 wirkt eine der Nullpunkteinstellung dienende Feder 54 ein, die sich gehäuseseitig an einer Einstellschraube 52 abstützt. Durch Verstellen dieser Einstellschraube 52 im Gewinde der Buchse 53 läßt sich die von der Feder 54 auf die Steuermembran 18 ausgeübte Kraft verändern.The pressure at the outlet 27 of the gas control valve is simultaneously supplied via the channel 41 to the chamber 42 on the side of the control membrane 43 carrying the closing body 21 facing away from the control membrane 18. A spring 54 which serves to adjust the zero point acts on the control diaphragm 18 and is supported on the housing side by an adjusting screw 52. By adjusting this adjusting screw 52 in the thread of the bushing 53, the force exerted by the spring 54 on the control membrane 18 can be changed.

Ferner gelangt der Druck am Auslaß 27 über den Kanal 44 in die Kammer 45 unterhalb der Membran 49. Diese trägt einen mit einem Ventilsitz 51 zusammenwirkenden Schließkörper 50. Auf die Membran 49 wirkt in Schließrichtung dieses Servoventils eine Druckfeder 47 ein, die sich gehäuseseitig über eine Einstellschraube 46 im Gewinde der Buchse 48 abstützt. Mit der Einstellschraube 46 kann der maximale Gasdruck eingestellt und begrenzt werden. Der Servodruckregler, bestehend aus Membran 49, Feder 47 und Schließkörper 50 in Verbindung mit dem Sitz 51 dient also wie bei der eingangs erwähnten Ventilserie V4700 der Begrenzung dem maximalen Gasdrucks. Die Schließkraft des Schließkörpers 50 auf den Sitz 51 wird mit der Feder 47 höher eingestellt all die Schließkraft des Schließkörpers 21 am Sitz 22. Das durch die Regelmembran 43, den Schließkörper 21 und den Sitz 22 in Verbindung mit den Federn 20 und 54 gebildete zweite Servoventil dient der Nullpunkteinstellung für die Regelkurve von Luft- und Gasmenge.Furthermore, the pressure at the outlet 27 passes through the channel 44 into the chamber 45 below the diaphragm 49. This carries a closing body 50 which interacts with a valve seat 51. A pressure spring 47 acts on the diaphragm 49 in the closing direction of this servo valve, which is located on the housing side via a Adjusting screw 46 is supported in the thread of the socket 48. The maximum gas pressure can be set and limited with the adjusting screw 46. The servo pressure regulator, consisting of diaphragm 49, spring 47 and closing body 50 in connection with the seat 51, is used as in the aforementioned valve series V4700 to limit the maximum gas pressure. The closing force of the closing body 50 on the seat 51 is set higher with the spring 47, all the closing force of the closing body 21 on the seat 22. The second servo valve formed by the control membrane 43, the closing body 21 and the seat 22 in connection with the springs 20 and 54 serves to set the zero point for the control curve of air and gas volume.

Der Ventilsitz 22 des Servoventils 21, 22 steht über die Leitung 55 mit der Kammer 38 in Verbindung. An ihm steht also der gleiche Druck wie er in der Kammer 39 auf die Membran 32 des Antriebs für das Hauptventil 28, 29 einwirkt. Steigt der Druck am Auslaß 27 und damit in den Kanälen 41 und 44 an und überwindet die durch ihn mittels der Regelmembran 43 erzeugte Kraft diejenige, welche von der Gegenseite durch die Feder 20 auf die Membran 18 einwirkt, so hebt der Schließkörper 21 vom Ventilsitz 22 ab, und der Arbeitsdruck in der Kammer 38 kann über die Leitung 55, den Ventilsitz 22, die Kammer 42 und den Kanal 41 zum Auslaß 27 hin abgebaut werden. Dies ist der übliche Regelvorgang eines Servodruckreglers. Gesteuert wird dieser Druck durch die Druckdifferenz auf den Leitungen 16 und 17 und damit in Abhängigkeit vom Luftdurchsatz im Luftzufuhrkanal 10. Die über die Düse 14 dem Brenner 11 zugeführte Gasmenge wird also ständig der vom Gebläse 9 geförderten Luftmenge nachgeführt. Hierdurch erzielt man auch bei unterschiedlichem Wärmebedarf und damit unterschiedlicher Luftmenge ein konstantes Luft/Gasverhältnis im dem Brenner 11 zugeführten Gemisch und damit eine gleichbleibende optimale Verbrennung. Das Flächenverhältnis der Membranen 18 und 43 bestimmt den Verstärkungsfaktor des Steuermoduls 19.The valve seat 22 of the servo valve 21, 22 is connected to the chamber 38 via the line 55. It has the same pressure on it as it acts in the chamber 39 on the membrane 32 of the drive for the main valve 28, 29. If the pressure at the outlet 27 and thus in the channels 41 and 44 increases and the force generated by it by means of the control membrane 43 overcomes that which acts on the membrane 18 from the opposite side through the spring 20, the closing body 21 lifts from the valve seat 22 and the working pressure in the chamber 38 can be reduced via the line 55, the valve seat 22, the chamber 42 and the channel 41 to the outlet 27. This is the usual process of regulating a servo pressure regulator. This pressure is controlled by the pressure difference on the lines 16 and 17 and thus as a function of the air throughput in the air supply duct 10. The amount of gas supplied to the burner 11 via the nozzle 14 is therefore continuously tracked to the amount of air conveyed by the blower 9. As a result, a constant air / gas ratio in the mixture supplied to the burner 11 and thus a constant optimal combustion are achieved even with different heat requirements and thus different air quantities. The area ratio of the membranes 18 and 43 determines the gain factor of the control module 19.

Wird die Heinzeinrichtung abgeschaltet, so nimmt das Einschaltventil 35, 36 unter der Kraft seiner Schließfeder wieder die in der Zeichnung angegebene Ruhelage ein, und der Steuerdruck in der Kammer 38 wird über den Ventilsitz 36 zum Auslaß 27 hin abgebaut. Das Hauptventil 28, 29 schließt.If the heating device is switched off, the on-off valve 35, 36 returns to the rest position shown in the drawing under the force of its closing spring, and the control pressure in the chamber 38 is reduced via the valve seat 36 to the outlet 27. The main valve 28, 29 closes.

Da die Leitungen 16 und 17 kein Gas sondern Luft führen, können sie als flexible Leitungen beliebiger Länge ausgebildet sein. Der Steuermodul 19 wird möglichst nahe am Gasregelventil 15 angeordnet. Die Verwendung eines getrennten und nicht in das Gasregelventil integrierten Steuermoduls hat den Vorteil, daß man entweder durch Austausch der Membranen 18 und/oder 43 oder durch Austauschen des Steuermoduls selbst unterschiedliche Verstärkungsfaktoren des Steuermoduls einstellen und damit ohne Veränderungen am Gasregelventil die Regeleinrichtung den Jeweiligen Gegebenheiten der Brenneranlage und Brennkammer anpassen kann. Die beträchtliche Verstärkung und die hierdurch bedingte hohe Schließkraft des Schließkörpers 21 gewährleistet eine zuverlässige Druckregelung des Gasregelventils.Since the lines 16 and 17 do not carry gas but air, they can be designed as flexible lines of any length. The control module 19 is arranged as close as possible to the gas control valve 15. The use of a separate control module, which is not integrated in the gas control valve, has the advantage that it can either be replaced the diaphragms 18 and / or 43 or by exchanging the control module itself to set different gain factors of the control module and thus the control device can adapt to the particular circumstances of the burner system and combustion chamber without changes to the gas control valve. The considerable gain and the resulting high closing force of the closing body 21 ensures reliable pressure control of the gas control valve.

Die Anordnung der Verstärker- bzw. Steuermembran 18 und der Regelmembran 43 dicht nebeneinander in einem besonderen Steuermodul 19 führt zu verbesserten Steuereigenschaften und erhöhter Stabilität des Ausgangsdrucks des Gasregelventils. Letzteres kann als Standardgerät für unterschiedliche Anwendungen ausgebildet sein und wird je nach Anwendungsart mit einem dementsprechend dimensionierten Steuermodul kombiniert. Da die Fläche der Membranen 18 und 43 frei wählbar ist, lassen sich relativ hohe Verstärkungsfaktoren erzielen. Dies würde schon aus Raumgründen nicht möglich sein, wenn diese Membranen in das Gasregelventil integriert wären. Der Steuermodul kann je nach Einbau des Gasregelventils an beliebiger Stelle neben dem Gasregelventil angeordnet sein. Insbesondere bei Verwendung flexibler Anschlußleitungen kann man den Steuermodul an derjenigen Stelle in einem Heizgerät unterbringen, wo genügend platz zur Verfügung steht. Er kann dort auch leicht justiert und eingestellt werden. Die flexible Leitungsverbindung des Steuermoduls mit dem Luftzufuhrkanal 10 ermöglicht es, dort den günstigsten und für eine stabile Arbeitsweise am besten geeigneten Anbringungsort für die Eingänge 23 und 56 zu wählen.The arrangement of the amplifier or control membrane 18 and the control membrane 43 close to each other in a special control module 19 leads to improved control properties and increased stability of the outlet pressure of the gas control valve. The latter can be designed as a standard device for different applications and, depending on the type of application, is combined with a correspondingly dimensioned control module. Since the area of the membranes 18 and 43 can be freely selected, relatively high amplification factors can be achieved. For reasons of space alone, this would not be possible if these membranes were integrated in the gas control valve. Depending on the installation of the gas control valve, the control module can be arranged anywhere alongside the gas control valve. In particular when using flexible connecting cables, the control module can be accommodated in a heater at the point where there is sufficient space available. It can also be easily adjusted and adjusted there. The flexible line connection of the control module to the air supply duct 10 makes it possible to choose the cheapest and most suitable location for the inputs 23 and 56 for a stable mode of operation.

Anstelle eines besonderen Servodruckreglers 46, 47, 49, 50, 51 zur Einstellung des Maximaldrucks könnt dieser Maximaldruck auch dadurch begrenzt werden, daß man den maximalen Hub der Steuermembran 18 durch einen verstellbaren Anschlag begrenzt.Instead of a special servo pressure regulator 46, 47, 49, 50, 51 for setting the maximum pressure, this maximum pressure can also be limited by limiting the maximum stroke of the control membrane 18 by an adjustable stop.

Claims (4)

1. Control device for the supply of gas and combustion air to a burner (11), controlled by the demand for heat of a load, whereat
a) an output signal of a heat demand controller (6), said signal corresponding to the demand for heat, controls a fan (8, 9) generating the combustion air flow;
b) nozzle means (23, 56) within the combustion air duct (10) generate a differential pressure signal proportional to the combustion air flow and supply said differential pressure signal to a control module (19) having a large area control diaphragm (18), which with its two sides is exposed to said differential pressure; and
c) the output of said control module (19) acts upon a gas control valve (15) for adapting the gas flow for the burner (11) to the combustion air flow;

characterized in that
d) a regulator diaphragm (43) of smaller size abuts via a first compression spring (20) against said control diaphragm (18) and carries a closure member (21) of a bleed valve (21, 22);
e) a chamber (42) at the side of the regulator diaphragm (43) opposite to the control diaphragm (18) is connected to the outlet (27) of the gas control valve (15);
f) the valve seat (22) of the bleed valve (21, 22) is connected to the actuator chamber (39) of a main valve (28, 29) which is positioned in front of the outlet (27) of the gas control valve (15) and which controls the supply of gas to the burner (11); and
g) a further servo valve (50, 51) is provided between the actuator chamber (39) of the diaphragm (32) of the main valve (28, 29) and a connecting channel (44) to the outlet (27) of the gas control valve (15), whereat the closure member (50) of said further servo valve (50, 51) is biased by a second compression spring (47) which limits the maximum gas pressure.
2. The control device of claim 1, characterized in that said second compression spring (47) abuts with its stationary end against an adjustment screw (46) which can be adjusted within a projecting portion (48) of the housing.
3. The control device of claim 1 or 2, characterized in that the control module (19) is connected to the nozzle means (23, 56) and/or the gas control valve (15) by means of flexible pipes (16, 17; 41, 55).
4. The control device of one of the claims 1 to 3, characterized in that the control diaphragm (18) abuts through a third compression spring (54) against an abutment (52) which can be adjusted within the housing of the control module (19, 53).
EP89114136A 1989-04-07 1989-08-01 Control device for gas burners Expired - Lifetime EP0390964B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3911268A DE3911268A1 (en) 1989-04-07 1989-04-07 CONTROL DEVICE FOR GAS BURNERS
DE3911268 1989-04-07

Publications (4)

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EP0390964A2 EP0390964A2 (en) 1990-10-10
EP0390964A3 EP0390964A3 (en) 1990-12-27
EP0390964B1 true EP0390964B1 (en) 1993-09-29
EP0390964B2 EP0390964B2 (en) 1996-07-24

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EP89114136A Expired - Lifetime EP0390964B2 (en) 1989-04-07 1989-08-01 Control device for gas burners

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EP (1) EP0390964B2 (en)
JP (1) JPH0355424A (en)
DE (2) DE3911268A1 (en)

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GB2284473A (en) * 1993-11-08 1995-06-07 Vaillant Joh Gmbh & Co Fan-assisted burner
US5520533A (en) * 1993-09-16 1996-05-28 Honeywell Inc. Apparatus for modulating the flow of air and fuel to a gas burner
EP0833106A2 (en) 1996-09-26 1998-04-01 Honeywell B.V. Method and device for operation optimisation of a gas burner
CN100436943C (en) * 2006-12-13 2008-11-26 中山华帝燃具股份有限公司 Burner for realizing air-gaseous fuel fixed proportional distribution and distributing method thereof

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AT401196B (en) * 1992-02-07 1996-07-25 Vaillant Gmbh HEATER
AT401570B (en) * 1992-10-02 1996-10-25 Vaillant Gmbh Method for controlling a blower-type gas burner
DE4317981A1 (en) * 1993-05-28 1994-12-01 Ranco Inc Gas-air ratio control device for a temperature control loop for gas appliances
IT1274622B (en) * 1994-08-17 1997-07-18 Integra Srl VALVE UNIT FOR GAS BOILERS
DE19538947C2 (en) * 1995-10-19 1998-11-26 Webasto Thermosysteme Gmbh Vehicle heater
DE19821853C1 (en) * 1998-05-15 1999-07-29 Honeywell Bv Regulator for gas burner
DE19824521B4 (en) 1998-06-02 2004-12-23 Honeywell B.V. Control device for gas burners
DE19922226C1 (en) * 1999-05-14 2000-11-30 Honeywell Bv Control device for gas burners
DE10037234A1 (en) * 2000-07-31 2002-02-21 Rational Ag Combustion system for a cooking device and cooking device with such a combustion system
US9528712B2 (en) * 2012-11-05 2016-12-27 Pat Caruso Modulating burner system
CN105509298B (en) * 2016-01-06 2019-01-29 佛山市沃克曼普电气有限公司 The adaptive premixed combustion heating device of the gas sensing formula being placed in water circuit system
CN108831664B (en) * 2018-05-17 2020-07-17 清华大学 Pressure stabilizer with energy conversion function for low-temperature compressed gas cavity
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WO2022183429A1 (en) 2021-03-04 2022-09-09 Pittway Sarl Partially-premixed gas burner appliance

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Publication number Priority date Publication date Assignee Title
US5520533A (en) * 1993-09-16 1996-05-28 Honeywell Inc. Apparatus for modulating the flow of air and fuel to a gas burner
GB2284473A (en) * 1993-11-08 1995-06-07 Vaillant Joh Gmbh & Co Fan-assisted burner
GB2284473B (en) * 1993-11-08 1998-02-18 Vaillant Joh Gmbh & Co Fan-assisted burner
EP0833106A2 (en) 1996-09-26 1998-04-01 Honeywell B.V. Method and device for operation optimisation of a gas burner
CN100436943C (en) * 2006-12-13 2008-11-26 中山华帝燃具股份有限公司 Burner for realizing air-gaseous fuel fixed proportional distribution and distributing method thereof

Also Published As

Publication number Publication date
DE3911268A1 (en) 1990-10-11
EP0390964B2 (en) 1996-07-24
EP0390964A2 (en) 1990-10-10
DE58905781D1 (en) 1993-11-04
JPH0355424A (en) 1991-03-11
EP0390964A3 (en) 1990-12-27

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