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EP0702194A1 - Combined gas/air-valve for burner - Google Patents

Combined gas/air-valve for burner Download PDF

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Publication number
EP0702194A1
EP0702194A1 EP94114019A EP94114019A EP0702194A1 EP 0702194 A1 EP0702194 A1 EP 0702194A1 EP 94114019 A EP94114019 A EP 94114019A EP 94114019 A EP94114019 A EP 94114019A EP 0702194 A1 EP0702194 A1 EP 0702194A1
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EP
European Patent Office
Prior art keywords
valve
air
gas
pressure
bodies
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94114019A
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German (de)
French (fr)
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EP0702194B1 (en
Inventor
Enno Vrolijk
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Garrett Motion SARL
Original Assignee
Honeywell BV
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Publication date
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Priority to EP94114019A priority Critical patent/EP0702194B1/en
Priority to DE59407236T priority patent/DE59407236D1/en
Publication of EP0702194A1 publication Critical patent/EP0702194A1/en
Application granted granted Critical
Publication of EP0702194B1 publication Critical patent/EP0702194B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/60—Devices for simultaneous control of gas and combustion air
    • 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
    • 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
    • F23N2235/12—Fuel valves

Definitions

  • the invention relates to a combined gas / air valve for burners according to the preamble of claim 1.
  • a valve of this type known from EP-A 0 559 280
  • each of the two valve bodies interacts with a conically shaped flow channel, in this way one in each case Throttle point to create variable passage cross section.
  • One valve body protrudes into a conically opening inlet channel for the fuel gas and flows against it in the opening direction.
  • the other valve body works together with a boundary wall of the mixture chamber which is conical in the same direction. This has the consequence that although the ratio of the mixture flow to the gas flow remains the same when the double valve body jams or there is strong friction, the ratio of gas to air flow is changed.
  • the invention is intended to remedy this.
  • a device for regulating the gas and combustion air supply to a burner in the same direction which has a double actuator, which can act on both the gas supply and the air supply, and is adjustable by a common electric drive.
  • an integrated mixing and adjusting module IMS for modulating premix burners is shown in FIG. 2 on page 410, in which the double actuator in the form of a double valve has a first throttle body for the air supply and a second throttle body coupled to the first throttle body for the gas supply, which are adjusted together by the control motor.
  • the two coaxially arranged throttle bodies can be adjusted relative to one another by rotating the valve rod of the one throttle body, which is provided with an external thread, in the valve rod of the other throttle body, which is designed as a bushing and has an internal thread.
  • the gas and air supply are adjusted together with a fixed mixing ratio.
  • the combustion air blower works at constant speed.
  • a similar device is known from DE-PS 969 044, where two conical throttle bodies are provided, which are mechanically coupled to one another via a rod, one of which, together with a first valve seat, supplies the combustion air supply controlling valve and the other, together with a second valve seat, forms a valve controlling the gas supply.
  • the gas / air mixture is drawn in through a compressor downstream of this mixing valve.
  • the two valve bodies are connected to the diaphragm of a diaphragm actuator via a common valve rod.
  • the supply air pressure acts on the underside of this membrane, while the chamber above the membrane is connected to the mixture outlet.
  • a weight placed on the membrane counteracts the supply air pressure.
  • a separate drive is provided for the joint adjustment of the two valve bodies. This considerably increases the space required for the combined gas / air valve.
  • An air / fuel valve for gas burners described in EP-A-0 316 454 also uses a separate valve drive to adjust the mechanically connected valve bodies.
  • a primary air valve and a secondary air valve are combined to form one structural unit.
  • the valve body of the primary air valve works together with a conical counter surface, while the valve body of the gas valve itself is conical.
  • the valve bodies of all three valves are adjusted by the measured actuator.
  • the invention characterized in claim 1 has the advantage that, like the aforementioned double valve according to EP-A 0 559 280, it does not require a special drive for the valve body, but has the essential advantage over this prior art that even in the case a mechanical impairment of the movement of the two valve bodies, for example as a result of a clamping of the valve rod or as a result of increased friction, the gas / air ratio which has been set is maintained regardless of the respective position of the double valve body and thus proper combustion is guaranteed.
  • This throughput is determined by the heat requirement, for example a hot water heater or a room to be heated, which controls the speed of the fan and thus the negative pressure downstream of the valve.
  • Advantageous refinements of the invention result from the subclaims. It is explained below using an exemplary embodiment shown in the drawing.
  • the valve housing 1 shown in section has an air inlet 2 and an outlet 3 for the gas / air mixture.
  • the cylindrical air inlet 2 merges into a conical or otherwise enlarging its flow channel 4, in which a disk-shaped valve body 5 is axially displaceable. It carries at its lower end facing the inlet 2 a pin 6 with a rounded cap, the one adjustable stop 7 faces in the form of a screw.
  • This is adjustable in a cross member 8 spanning the air inlet 2 and provided with air through openings. Ribs 9 projecting into the flow channel 4 serve to axially guide the valve body 5.
  • a second valve body 11 is fastened to the valve body 5 via a valve rod 10 and cooperates with a likewise conical flow channel 12. This passes into the gas inlet 13.
  • the taper or change in cross section of both flow channels 4 and 12 runs in the same direction.
  • a guide pin 14 in connection with a stationary guide 15 ensures a tilt-free guidance of the double valve body 5, 10, 11.
  • the flow channel 12 is provided in a bushing 17 inserted into the cover 16 of the housing 1.
  • a helical or conical spring 18 is supported on the one hand on the housing cover 16 and on the other hand on the valve body 5 of the air valve and presses it in the direction of the conical boundary wall 4 of the air inflow channel.
  • the double closing body 5, 10, 11 has no drive, but is raised against the force of the spring 18 and against the force of its weight by the negative pressure at the mixture outlet 3, provided that this negative pressure is sufficiently strong.
  • the size of the negative pressure determines the position of both valve bodies 5 and 11. Since the double closing body 5, 10 is guided at both ends in guides 9 and 15, it can also be arranged with the valve rod 10 extending horizontally.
  • the dimensions of the two closing bodies 5 and 11 and the associated flow channels 4 and 12 are such that a predetermined gas / air ratio in the mixture M at the outlet 3 is present in any position of the double valve body, regardless of the total flow rate of the mixture.
  • the two valve bodies 5 and 11 can be arranged so as to be adjustable relative to one another, for example by providing the valve rod 10 with a thread at its lower end and being adjustable in a corresponding internal thread of the valve body 5.
  • the guide pin 14 can be equipped with an engagement surface for an adjustment tool.
  • Maintaining a constant gas / air ratio requires that the inlet pressures of gas and air be in a predetermined relationship.
  • This can be achieved by a pressure regulator 19 in the gas supply line 20, which tracks the inlet gas pressure P13 to the inlet air pressure P2 either in a ratio of 1: 1 or with a constant amplification factor.
  • a suitable embodiment of a pressure regulator for this is in European patent application 93 114 902.5 from September 16, 1993 (72200796). Other known pressure regulators can also be used for this.
  • the position of the valve bodies 5, 11 depends on the pressure difference P2 - P3 between the pressures P2 at the air inlet 2 and at the mixture outlet 3 and is, for example, proportional to this pressure difference.
  • the blower increases the negative pressure at outlet 3 and thus the throughput.
  • the air supply through inlet 2 and the gas supply through inlet 13 are increased in an unchanged ratio to one another. If heat is no longer required and the blower is switched back to a minimum speed or stopped, the underpressure lifting the valve body 5 is eliminated, and the spring 18 presses the valve body 5 with its cap 6 against the stop 7.
  • This can be set, for example, in such a way that a minimum gas / air throughput that prevents the burner from going out is maintained. Since no special drive is required for the double valve body 4, 11, this valve has a significantly lower overall height than the valves with double valve body known in the prior art for simultaneous gas / air control.
  • the opening characteristics of the double valve body can be influenced by the spring 18, which can be adjusted in a known manner.
  • the spring 18 can be supported, for example, via an axially adjustable stop on the cover 16.
  • a pressure difference P2 - P3, which moves the valve bodies 5, 11, can be generated by a blower, not shown, which is effective at the air inlet 2, at the mixture outlet 3 or at the outlet of a combustion chamber connected downstream of the valve.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Multiple-Way Valves (AREA)

Abstract

Valve bodies (5,11) are moved from a closed to an open position. One valve (4,5) is positioned in the air inlet duct (2,4) for the combustion air and the other valve (11,12) is positioned in the gas inlet duct (12,13). Each valve body has a flow duct (4,12). A pressure regulator (19) in the gas inlet pipe (20) plots the inlet gas pressure in a preset ratio to the inlet air pressure. A readjusting spring (18) with adjustable spring force is positioned between the valve housing (1,16) and the two valve bodies. The two valve bodies are connected by the same valve spindle (10) which has guides (14,15).

Description

Die Erfindung betrifft ein kombiniertes Gas/Luft-Ventil für Brenner gemäß Oberbegriff des Anspruchs 1. Bei einem aus EP-A 0 559 280 bekannten Ventil dieser Art wirkt jeder der beiden Ventilkörper mit je einem konisch ausgebildeten Strömungskanal zusammen, um auf diese Weise je eine Drosselstelle veränderbaren Durchlaßquerschnitts zu schaffen. Der eine Ventilkörper ragt in einen sich konisch öffnenden Einlaßkanal für das Brenngas hinein und wird von diesem in Öffnungsrichtung angeströmt. Der andere Ventilkörper arbeitet mit einer in der gleichen Richtung konisch ausgebildeten Begrenzungswand der Gemischkammer zusammen. Dies hat zur Folge, daß bei einem Klemmen oder bei starker Reibung des Doppelventilkörpers zwar das Verhältnis des Gemischstroms zum Gasstrom gleich bleibt, jedoch das Verhältnis von Gas- zum Luftstrom geändert wird. Hier soll die Erfindung Abhilfe schaffen.The invention relates to a combined gas / air valve for burners according to the preamble of claim 1. In a valve of this type known from EP-A 0 559 280, each of the two valve bodies interacts with a conically shaped flow channel, in this way one in each case Throttle point to create variable passage cross section. One valve body protrudes into a conically opening inlet channel for the fuel gas and flows against it in the opening direction. The other valve body works together with a boundary wall of the mixture chamber which is conical in the same direction. This has the consequence that although the ratio of the mixture flow to the gas flow remains the same when the double valve body jams or there is strong friction, the ratio of gas to air flow is changed. The invention is intended to remedy this.

Aus dem Bericht über die International Gas Research Conference 1992 ist eine Einrichtung zur gleichsinnigen Regelung von Gas- und Verbrennungsluftzufuhr zu einem Brenner bekannt, welche ein sowohl aufdie Gaszufuhr als auch auf die Luftzufuhr einwirkendes, von einem gemeinsamen Elektroantrieb verstellbaren Doppelstellglied aufweist. Im genannten Bericht ist in Figur 2 auf Seite 410 ein integriertes Misch- und Stellmodul IMS für modulierende Vormischbrenner dargestellt, bei dem das Doppelstellglied in Form eines Doppelventils einen ersten Drosselkörper für die Luftzufuhr sowie einen mit dem ersten Drosselkörper gekoppelten zweiten Drosselkörper für die Gaszufuhr aufweist, welche gemeinsam von dem Steuermotor verstellt werden. Zur Veränderung des Gas/Luftverhältnisses kann man die beiden koaxial zueinander angeordneten Drosselkörper gegeneinander verstellen, indem man die mit einem Außengewinde versehene Ventilstange des einen Drosselkörpers in der als Buchse ausgestalteten und mit einem Innengewinde versehenen Ventilstange des anderen Drosselkörpers verdreht. Mit Hilfe des Motorantriebs erfolgt eine gemeinsame Verstellung von Gas- und Luftzufuhr bei festem Mischverhältnis. Das Verbrennungsluftgebläse arbeitet mit konstanter Drehzahl.From the report on the International Gas Research Conference 1992, a device for regulating the gas and combustion air supply to a burner in the same direction is known, which has a double actuator, which can act on both the gas supply and the air supply, and is adjustable by a common electric drive. In the report mentioned, an integrated mixing and adjusting module IMS for modulating premix burners is shown in FIG. 2 on page 410, in which the double actuator in the form of a double valve has a first throttle body for the air supply and a second throttle body coupled to the first throttle body for the gas supply, which are adjusted together by the control motor. To change the gas / air ratio, the two coaxially arranged throttle bodies can be adjusted relative to one another by rotating the valve rod of the one throttle body, which is provided with an external thread, in the valve rod of the other throttle body, which is designed as a bushing and has an internal thread. With the help of the motor drive, the gas and air supply are adjusted together with a fixed mixing ratio. The combustion air blower works at constant speed.

Eine ähnliche Einrichtung ist aus DE-PS 969 044 bekannt, wo zwei konisch ausgebildete und über eine Stange miteinander mechanisch gekoppelte Drosselkörper vorgesehen sind, von denen der eine zusammen mit einem ersten Ventilsitz ein die Verbrennungsluftzufuhr steuerndes Ventil und der andere zusammen mit einem zweiten Ventilsitz ein die Gaszufuhr steuerndes Ventil bildet. Das Gas/Luft-Gemisch wird durch einen diesem Mischventil nachgeschalteten Verdichter angesaugt. Die beiden Ventilkörper sind über eine gemeinsame Ventilstange mit der Membran eines Membranantriebs verbunden. Auf die Unterseite dieser Membran wirkt der Zuluftdruck ein, während die Kammer oberhalb der Membran mit dem Gemisch-Auslaß verbunden ist. Dem Zuluftdruck wirkt ein auf die Membran aufgesetztes Gewicht entgegen. Auch hier ist wie beim zuvorgenannten Doppelventil ein gesonderter Antrieb zur gemeinsamen Verstellung der beiden Ventilkörper vorgesehen. Dies vergrößert den Platzbedarf für das kombinierte Gas/Luft-Ventil beträchtlich.A similar device is known from DE-PS 969 044, where two conical throttle bodies are provided, which are mechanically coupled to one another via a rod, one of which, together with a first valve seat, supplies the combustion air supply controlling valve and the other, together with a second valve seat, forms a valve controlling the gas supply. The gas / air mixture is drawn in through a compressor downstream of this mixing valve. The two valve bodies are connected to the diaphragm of a diaphragm actuator via a common valve rod. The supply air pressure acts on the underside of this membrane, while the chamber above the membrane is connected to the mixture outlet. A weight placed on the membrane counteracts the supply air pressure. Here too, as with the double valve mentioned above, a separate drive is provided for the joint adjustment of the two valve bodies. This considerably increases the space required for the combined gas / air valve.

Auch ein in EP-A-0 316 454 beschriebenes Luft/Brennstoff-Ventil für Gasbrenner verwendet zum Verstellen der mechanisch miteinander verbundenen Ventilkörper einen gesonderten Ventilantrieb. Außer einem Gasventil sind dabei ein Primärluftventil sowie ein Sekundärluftventil zu einer Baueinheit zusammengefaßt. Der Ventilkörper des Primärluftventils arbeitet mit einer konischen Gegenfläche zusammen, während der Ventilkörper des Gasventils selbst konisch ausgebildet ist. Die Ventilkörper aller drei Ventile werden von dem gemessenen Antrieb verstellt.An air / fuel valve for gas burners described in EP-A-0 316 454 also uses a separate valve drive to adjust the mechanically connected valve bodies. In addition to a gas valve, a primary air valve and a secondary air valve are combined to form one structural unit. The valve body of the primary air valve works together with a conical counter surface, while the valve body of the gas valve itself is conical. The valve bodies of all three valves are adjusted by the measured actuator.

Die im Anspruch 1 gekennzeichnete Erfindung hat demgegenüber den Vorteil, daß sie, wie auch das eingangs erwähnte Doppelventil gemäß EP-A 0 559 280 keinen besonderen Antrieb für die Ventilkörper benötigt, aber gegenüber diesem Stand der Technik den wesentlichen Vorteil hat, daß auch im Falle einer mechanischen Beeinträchtigung der Bewegung der beiden Ventilkörper, beispielsweise infolge eines Klemmens der Ventilstange oder infolge erhöhter Reibung, das einmal eingestellte Gas/Luft-Verhältnis unabhängig von der jeweiligen Stellung des Doppelventilkörpers eingehalten wird und somit eine ordnungsgemäße Verbrennung gewährleistet bleibt. Dies gilt für alle gewünschten Durchsatzwerte, also auch bei sehr geringem Durchsatz. Dieser Durchsatz wird bestimmt durch den Wärmebedarf, beispielsweise eines Warmwassererhitzers oder eines zu beheizenden Raumes, welcher die Drehzahl des Gebläses und damit den Unterdruck stromabwärts des Ventils steuert. Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen. Sie wird nachfolgend anhand eines in der Zeichnung wiedergegebenen Ausführungsbeispiels erläutert.The invention characterized in claim 1 has the advantage that, like the aforementioned double valve according to EP-A 0 559 280, it does not require a special drive for the valve body, but has the essential advantage over this prior art that even in the case a mechanical impairment of the movement of the two valve bodies, for example as a result of a clamping of the valve rod or as a result of increased friction, the gas / air ratio which has been set is maintained regardless of the respective position of the double valve body and thus proper combustion is guaranteed. This applies to all desired throughput values, i.e. even with very low throughput. This throughput is determined by the heat requirement, for example a hot water heater or a room to be heated, which controls the speed of the fan and thus the negative pressure downstream of the valve. Advantageous refinements of the invention result from the subclaims. It is explained below using an exemplary embodiment shown in the drawing.

Das im Schnitt wiedergegebene Ventilgehäuse 1 hat einen Lufteinlaß 2 sowie einen Auslaß 3 für das Gas/Luft-Gemisch. Der zylindrische Lufteinlaß 2 geht in einen konisch oder anderweit seinen Querschnitt vergrößernden Strömungskanal 4 über, in welchem ein scheibenförmiger Ventilkörper 5 axial verschiebbar ist. Er trägt an seinem dem Einlaß 2 zugewandten unteren Ende einen mit einer abgerundeten Kappe 6 versehenen Stift, dem ein einstellbarer Anschlag 7 in Form einer Schraube gegenübersteht. Diese ist in einer den Lufteinlaß 2 überspannenden und mit Luftdurchschnittsöffnungen versehenen Traverse 8 verstellbar. Zur Axialführung des Ventilkörpers 5 dienen in den Strömungskanal 4 hineinragende Rippen 9.The valve housing 1 shown in section has an air inlet 2 and an outlet 3 for the gas / air mixture. The cylindrical air inlet 2 merges into a conical or otherwise enlarging its flow channel 4, in which a disk-shaped valve body 5 is axially displaceable. It carries at its lower end facing the inlet 2 a pin 6 with a rounded cap, the one adjustable stop 7 faces in the form of a screw. This is adjustable in a cross member 8 spanning the air inlet 2 and provided with air through openings. Ribs 9 projecting into the flow channel 4 serve to axially guide the valve body 5.

Über eine Ventilstange 10 ist am Ventilkörper 5 ein zweiter Ventilkörper 11 befestigt, welcher mit einem ebenfalls konisch ausgebildeten Strömungskanal 12 zusammenwirkt. Dieser geht in den Gaseinlaß 13 über. Die Konizität bzw. Querschnittsänderung beider Strömungskanäle 4 und 12 verläuft in der gleichen Richtung. Ein Führungsstift 14 in Verbindung mit einer ortsfesten Führung 15 sorgt für eine kippfreie Führung des Doppelventilkörpers 5, 10, 11. Der Strömungskanal 12 ist in einer in den Deckel 16 des Gehäuses 1 eingesetzten Buchse 17 vorgesehen. Eine Schrauben- oder Kegelfeder 18 stützt sich einerseits am Gehäusedeckel 16 und andererseits am Ventilkörper 5 des Luftventils ab und drückt diesen in Richtung auf die konische Begrenzungswand 4 des Lufteinströmkanals.A second valve body 11 is fastened to the valve body 5 via a valve rod 10 and cooperates with a likewise conical flow channel 12. This passes into the gas inlet 13. The taper or change in cross section of both flow channels 4 and 12 runs in the same direction. A guide pin 14 in connection with a stationary guide 15 ensures a tilt-free guidance of the double valve body 5, 10, 11. The flow channel 12 is provided in a bushing 17 inserted into the cover 16 of the housing 1. A helical or conical spring 18 is supported on the one hand on the housing cover 16 and on the other hand on the valve body 5 of the air valve and presses it in the direction of the conical boundary wall 4 of the air inflow channel.

Der Doppelschließkörper 5, 10, 11 hat keinen Antrieb, sondern wird gegen die Kraft der Feder 18 und gegen die Kraft seines Gewichts durch den Unterdruck am Gemischauslaß 3 angehoben, sofern dieser Unterdruck genügend stark ist. Die Größe des Unterdrucks bestimmt die Position beider Ventilkörper 5 und 11. Da der Doppelschließkörper 5, 10 an beiden Enden in Führungen 9 bzw. 15 geführt ist, kann er auch mit sich horizontal erstreckender Ventilstange 10 angeordnet sein. Die Abmessungen der beiden Schließkörper 5 und 11 und der zugehörigen Strömungskanäle 4 und 12 sind derart getroffen, daß in jeder beliebigen Stellung des Doppelventilkörpers ein vorgegebenes Gas/Luft-Verhältnis im Gemisch M am Ausgang 3 vorhanden ist, unabhängig von der Gesamtströmungsmenge des Gemisches.The double closing body 5, 10, 11 has no drive, but is raised against the force of the spring 18 and against the force of its weight by the negative pressure at the mixture outlet 3, provided that this negative pressure is sufficiently strong. The size of the negative pressure determines the position of both valve bodies 5 and 11. Since the double closing body 5, 10 is guided at both ends in guides 9 and 15, it can also be arranged with the valve rod 10 extending horizontally. The dimensions of the two closing bodies 5 and 11 and the associated flow channels 4 and 12 are such that a predetermined gas / air ratio in the mixture M at the outlet 3 is present in any position of the double valve body, regardless of the total flow rate of the mixture.

Zur Einstellung des Gas/Luft-Verhältnisses kann man die beiden Ventilkörper 5 und 11 gegeneinander verstellbar anordnen, indem beispielsweise die Ventilstange 10 an ihrem unteren Ende mit einem Gewinde versehen, und in einem entsprechenden Innengewinde des Ventilkörpers 5 verstellbar ist. Hierzu kann der Führungsstift 14 mit einer Angriffsfläche für ein Verstellwerkzeug ausgestattet sein.To adjust the gas / air ratio, the two valve bodies 5 and 11 can be arranged so as to be adjustable relative to one another, for example by providing the valve rod 10 with a thread at its lower end and being adjustable in a corresponding internal thread of the valve body 5. For this purpose, the guide pin 14 can be equipped with an engagement surface for an adjustment tool.

Die Aufrechterhaltung eines konstanten Gas/Luft-Verhältnisses erfordert, daß die Einlaßdrücke von Gas und Luft in einem vorgegebenen Verhältnis zueinander stehen. Dies läßt sich durch einen Druckregler 19 in der Gaszufuhrleitung 20 erreichen, welcher den Einlaßgasdruck P13 dem Einlaßluftdruck P2 entweder im Verhältnis 1:1 oder mit einem konstanten Verstärkungsfaktor nachführt. Eine hierfür geeignete Ausführungsform eines Druckreglers ist in der europäischen Patentanmeldung 93 114 902.5 vom 16.9.1993 (72200796) beschrieben. Auch andere bekannte Druckregler können hierfür Verwendung finden. Die Stellung der Ventilkörper 5, 11 hängt von der Druckdifferenz P2 - P3 zwischen den Drücken P2 am Lufteinlaß 2 und am Gemischauslaß 3 ab und ist dieser Druckdifferenz beispielsweise proportional.Maintaining a constant gas / air ratio requires that the inlet pressures of gas and air be in a predetermined relationship. This can be achieved by a pressure regulator 19 in the gas supply line 20, which tracks the inlet gas pressure P13 to the inlet air pressure P2 either in a ratio of 1: 1 or with a constant amplification factor. A suitable embodiment of a pressure regulator for this is in European patent application 93 114 902.5 from September 16, 1993 (72200796). Other known pressure regulators can also be used for this. The position of the valve bodies 5, 11 depends on the pressure difference P2 - P3 between the pressures P2 at the air inlet 2 and at the mixture outlet 3 and is, for example, proportional to this pressure difference.

Wird von dem an den Auslaß 3 angeschlossenen Brenner eine höhere Leistung gefordert, so erhöht das Gebläse den Unterdruck am Auslaß 3 und damit den Durchsatz. Dabei wird gleichzeitig im unveränderten Verhältnis zueinander die Luftzufuhr über den Einlaß 2 als auch die Gaszufuhr durch den Einlaß 13 erhöht. Wird keine Wärme mehr benötigt und das Gebläse auf eine Mindestdrehzahl zurückgeschaltet oder stillgesetzt, so fällt der den Ventilkörper 5 anhebende Unterdruck weg, und die Feder 18 drückt den Ventilkörper 5 mit seiner Kappe 6 gegen den Anschlag 7. Dieser kann beispielsweise derart eingestellt sein, daß ein das Erlöschen des Brenners vermeidender minimaler Gas/Luft-Durchsatz erhalten bleibt. Da kein besonderer Antrieb für den Doppelventilkörper 4, 11 benötigt wird, hat dieses Ventil eine wesentlich geringere Bauhöhe als die im Stand der Technik bekannten Ventile mit Doppelventilkörper zur gleichzeitigen Gas/Luftregelung. Die Öffnungscharakteristik des Doppelventilkörpers läßt sich durch die Feder 18 beeinflussen, welche in bekannter Weise einstellbar sein kann. Hierfür kann sich die Feder 18 beispielsweise über einen axial verstellbaren Anschlag am Deckel 16 abstützen.If a higher output is required from the burner connected to outlet 3, the blower increases the negative pressure at outlet 3 and thus the throughput. At the same time, the air supply through inlet 2 and the gas supply through inlet 13 are increased in an unchanged ratio to one another. If heat is no longer required and the blower is switched back to a minimum speed or stopped, the underpressure lifting the valve body 5 is eliminated, and the spring 18 presses the valve body 5 with its cap 6 against the stop 7. This can be set, for example, in such a way that a minimum gas / air throughput that prevents the burner from going out is maintained. Since no special drive is required for the double valve body 4, 11, this valve has a significantly lower overall height than the valves with double valve body known in the prior art for simultaneous gas / air control. The opening characteristics of the double valve body can be influenced by the spring 18, which can be adjusted in a known manner. For this purpose, the spring 18 can be supported, for example, via an axially adjustable stop on the cover 16.

Da die Schließkraft des Ventilkörpers 5 nicht nur durch dessen Eigengewicht hervorgerufen, sondern durch die Feder 18 unterstützt wird, kann man das Doppelventil nicht nur, wie dargestellt, vertikal, sondern auch mit horizontal verlaufender Achse der Ventilstange 10 einbauen, ohne daß hierdurch die Funktionsfähigkeit des Doppelventils oder das einmal vorgegebene Gas/Luft-Verhältnis beeinträchtigt würde. Die Erzeugung einer die Ventilkörper 5, 11 bewegenden Druckdifferenz P2 - P3 kann durch ein nicht dargestelltes Gebläse erfolgen, welches am Lufteinlaß 2, am Gemischauslaß 3 oder am Auslaß einer dem Ventil nachgeschalteten Brennkammer wirksam ist.Since the closing force of the valve body 5 is not only caused by its own weight, but is supported by the spring 18, the double valve can not only be installed vertically, as shown, but also with the axis of the valve rod 10 running horizontally, without the functionality of the valve Double valve or the predetermined gas / air ratio would be affected. A pressure difference P2 - P3, which moves the valve bodies 5, 11, can be generated by a blower, not shown, which is effective at the air inlet 2, at the mixture outlet 3 or at the outlet of a combustion chamber connected downstream of the valve.

Claims (8)

Kombiniertes Gas/Luftventil für Brenner mit zwei mechanisch miteinander verbundenen und gleichachsig angeordneten Ventilkörpern (5, 11), welche ohne gesonderten Ventilantrieb durch einen stromabwärts des Ventils herrschenden Unterdruck aus der Schließstellung in eine vom Druck am Ventilauslaß (3) abhängige Offenstellung bewegbar sind, dadurch gekennzeichnet, daß a) das eine Ventil (4, 5) im Zuluftkanal (2, 4) für die Verbrennungsluft und das andere Ventil (11, 12) im Gaszufuhrkanal (12, 13) angeordnet ist, b) der Ventilkörper (5) des Luftventils (4, 5) in Öffnungsrichtung und der Ventilkörper (11) des Gasventils (11, 12) in Schließrichtung angeströmt ist; und c) ein Druckregler (19) in der Gaszufuhrleitung (20) angeordnet ist, welcher den Einlaßgasdruck dem Einlaßluftdruck in einem vorgegebenen Verhältnis nachführt. Combined gas / air valve for burners with two mechanically connected to one another and coaxially arranged valve bodies (5, 11), which without a separate valve drive ruling by a downstream of the valve under pressure from the closed position in a dependent of the pressure at the valve outlet (3) open position are movable, characterized characterized in that a) a valve (4, 5) in the supply air duct (2, 4) for the combustion air and the other valve (11, 12) in the gas supply duct (12, 13) is arranged, b) the valve body (5) of the air valve (4, 5) flows in the opening direction and the valve body (11) of the gas valve (11, 12) in the closing direction; and c) a pressure regulator (19) is arranged in the gas supply line (20), which tracks the inlet gas pressure to the inlet air pressure in a predetermined ratio. Ventil nach Anspruch 1, dadurch gekennzeichnet, daß die Ventilkörper (5, 11) mit je einem Strömungskanal (4, 12) von sich in Hubrichtung veränderndem Querschnitt zusammenwirken oder selbst einen sich in Hubrichtung ändernden Querschnitt haben.Valve according to Claim 1, characterized in that the valve bodies (5, 11) each interact with a flow channel (4, 12) with a cross section which changes in the stroke direction or themselves have a cross section which changes in the stroke direction. Ventil nach Anspruch 1 oder 2, gekennzeichnet durch eine die Ventilkörper (5, 11) in Schließrichtung beaufschlagende Rückstellfeder (18), die zwischen demVentilgehäuse (1, 16) und den beiden Ventilkörpern (5, 11) eingespannt ist.Valve according to Claim 1 or 2, characterized by a return spring (18) which acts on the valve bodies (5, 11) in the closing direction and which is clamped between the valve housing (1, 16) and the two valve bodies (5, 11). Ventil nach Anspruch 3, dadurch gekennzeichnet, daß die Federkraft der Rückstellfeder (18) einstellbar ist.Valve according to claim 3, characterized in that the spring force of the return spring (18) is adjustable. Ventil nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die beiden Ventilkörper (5, 11) durch eine gemeinsame Ventilstange (10) miteinander verbunden sind.Valve according to one of claims 1 to 4, characterized in that the two valve bodies (5, 11) are connected to one another by a common valve rod (10). Ventil nach Anspruch 5, gekennzeichnet durch eine Ventilstangenführung (14, 15).Valve according to claim 5, characterized by a valve rod guide (14, 15). Ventil nach einem der Ansprüche 1 bis 6, gekennzeichnet durch einen die Bewegung des Ventilkörpers (5) des Luftventils (4, 5) in Schließrichtung begrenzenden, vorzugsweise verstellbaren Anschlag (7).Valve according to one of claims 1 to 6, characterized by a preferably adjustable stop (7) which limits the movement of the valve body (5) of the air valve (4, 5) in the closing direction. Ventil nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Druckdifferenz zwischen Lufteinlaß (2) und Ventilauslaß (3) durch ein an den Lufteinlaß (2) oder an den Gemischauslaß (3) des Ventils angeschlossenes oder am Auslaß der Brennkammer vorgesehenes Gebläse erzeugt wird..Valve according to one of claims 1 to 7, characterized in that the pressure difference between air inlet (2) and valve outlet (3) by a fan connected to the air inlet (2) or to the mixture outlet (3) of the valve or provided at the outlet of the combustion chamber is produced..
EP94114019A 1994-09-07 1994-09-07 Combined gas/air-valve for burner Expired - Lifetime EP0702194B1 (en)

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EP94114019A EP0702194B1 (en) 1994-09-07 1994-09-07 Combined gas/air-valve for burner
DE59407236T DE59407236D1 (en) 1994-09-07 1994-09-07 Combined gas / air valve for burners

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EP94114019A EP0702194B1 (en) 1994-09-07 1994-09-07 Combined gas/air-valve for burner

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EP0702194B1 EP0702194B1 (en) 1998-11-04

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Cited By (8)

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Publication number Priority date Publication date Assignee Title
DE19729047C1 (en) * 1997-07-08 1998-09-24 Honeywell Bv Air mixer for gas burner
DE19859283A1 (en) * 1998-12-22 2000-07-06 Bosch Gmbh Robert Blower premix burner operation supplements gas at ignition by volume choke using regulator valve parameter choke controling enrichment valve volume and timing.
EP1114688A2 (en) 2000-01-06 2001-07-11 DI-WA Lock GmbH Safety valve used in an oxygen and cutting gas supplying of a cutting and welding gun
WO2008058640A1 (en) * 2006-11-14 2008-05-22 Sit La Precisa S.P.A. Method for controlling the delivery of a combustible air-gas mixture to a burner device
CN101469871B (en) * 2007-12-27 2011-05-25 广东万和新电气股份有限公司 Gas and air fixed proportion control valve of gas kitchen range
CN103261791A (en) * 2010-12-15 2013-08-21 庆东纳碧安株式会社 Gas boiler including output adjusting device, and method of adjusting output of gas boiler
DE102017216966A1 (en) * 2017-09-25 2019-03-28 Robert Bosch Gmbh Mixing device for heaters and heaters with such a mixing device
CN113776071A (en) * 2021-09-30 2021-12-10 合肥工业大学 An automatic control device for exhaust gas intake air pressure for low temperature combustion of VOC

Families Citing this family (1)

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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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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19729047C1 (en) * 1997-07-08 1998-09-24 Honeywell Bv Air mixer for gas burner
EP0890787A2 (en) 1997-07-08 1999-01-13 Honeywell B.V. Mixing device for gas and combustion air in a combustion installation
DE19859283A1 (en) * 1998-12-22 2000-07-06 Bosch Gmbh Robert Blower premix burner operation supplements gas at ignition by volume choke using regulator valve parameter choke controling enrichment valve volume and timing.
DE19859283C2 (en) * 1998-12-22 2001-02-15 Bosch Gmbh Robert Device for mixing gas and air for a burner
EP1114688A2 (en) 2000-01-06 2001-07-11 DI-WA Lock GmbH Safety valve used in an oxygen and cutting gas supplying of a cutting and welding gun
EP1114688A3 (en) * 2000-01-06 2004-04-14 DI-WA Lock GmbH Safety valve used in an oxygen and cutting gas supplying of a cutting and welding gun
WO2008058640A1 (en) * 2006-11-14 2008-05-22 Sit La Precisa S.P.A. Method for controlling the delivery of a combustible air-gas mixture to a burner device
CN101469871B (en) * 2007-12-27 2011-05-25 广东万和新电气股份有限公司 Gas and air fixed proportion control valve of gas kitchen range
CN103261791A (en) * 2010-12-15 2013-08-21 庆东纳碧安株式会社 Gas boiler including output adjusting device, and method of adjusting output of gas boiler
CN103261791B (en) * 2010-12-15 2015-09-30 庆东纳碧安株式会社 There is the gas fired-boiler of PCU Power Conditioning Unit and the power regulating method of gas fired-boiler
DE102017216966A1 (en) * 2017-09-25 2019-03-28 Robert Bosch Gmbh Mixing device for heaters and heaters with such a mixing device
CN113776071A (en) * 2021-09-30 2021-12-10 合肥工业大学 An automatic control device for exhaust gas intake air pressure for low temperature combustion of VOC

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EP0702194B1 (en) 1998-11-04

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