EP1882882A2 - Flowrate regulating device - Google Patents

Flowrate regulating device Download PDF

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Publication number
EP1882882A2
EP1882882A2 EP07005099A EP07005099A EP1882882A2 EP 1882882 A2 EP1882882 A2 EP 1882882A2 EP 07005099 A EP07005099 A EP 07005099A EP 07005099 A EP07005099 A EP 07005099A EP 1882882 A2 EP1882882 A2 EP 1882882A2
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EP
European Patent Office
Prior art keywords
flow regulator
regulator according
throttle
volume flow
valve
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.)
Withdrawn
Application number
EP07005099A
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German (de)
French (fr)
Inventor
Johann Moses
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.)
Karl Dungs GmbH and Co KG
Original Assignee
Karl Dungs GmbH and Co KG
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Filing date
Publication date
Application filed by Karl Dungs GmbH and Co KG filed Critical Karl Dungs GmbH and Co KG
Publication of EP1882882A2 publication Critical patent/EP1882882A2/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus
    • F23K5/002—Gaseous fuel
    • F23K5/007—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/005—Regulating fuel supply using electrical or electromechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2400/00—Pretreatment and supply of gaseous fuel
    • F23K2400/20—Supply line arrangements
    • F23K2400/201—Control devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2900/00—Special features of, or arrangements for fuel supplies
    • F23K2900/05001—Control or safety devices in gaseous or liquid fuel supply lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2221/00—Pretreatment or prehandling
    • F23N2221/10—Analysing fuel properties, e.g. density, calorific
    • 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

Definitions

  • the invention relates to a volumetric flow controller, in particular for heating burners.
  • Burners of heating systems must be supplied with defined gas flows or gas / air mixtures of defined composition.
  • This is used, for example, according to the DE 103 40 045 A1 a ratio regulator, which picks up different pressures at a line leading to the burner or its gas nozzle and uses these to control a fluid actuator for a valve.
  • the fluid actuator has for this purpose a membrane which divides two chambers in a drive housing. One of the chambers communicates with the ambient pressure.
  • the ratio pressure regulator forms a gas flow depending on the ambient air pressure.
  • the gas flow at full load is increasingly independent of the pressure set on the output side gas pressure.
  • the set gas flow is occasionally not constant or tends to vibrate.
  • Larger sized fittings are expensive.
  • Higher pressure drops on the burner require a higher gas inlet pressure, which in turn overwhelms the small valves.
  • the volume flow regulator according to the invention has a controlled valve, which is provided with a fluid drive, for example, in the form of a diaphragm drive. Downstream of the controlled valve, a control throttle is arranged, on which a differential pressure tap is provided. This includes a first pressure tap upstream of the control throttle and a second pressure tap downstream thereof. About the Differenz horrabgriff a differential pressure signal is passed to the fluid drive, which performs an adjusting movement according to the differential pressure signal. The regulation takes place in the sense that the controlled valve counteracts differential pressure changes. If the differential pressure becomes too great, the valve tends to close while it tends to open when the differential pressure at the variable throttle becomes too low.
  • the controlled volume flow of the back pressure of the burner is completely independent.
  • the determination of the size of the gas volume flow is effected by a gas pressure control based on the differential pressure at the control throttle.
  • the controller keeps the pressure difference at the control throttle constant.
  • the gas volume flow in the ideal case only depends on the setting position of the actuating choke.
  • the amount of gas is then linearly dependent on the fine throttle cross-section. It can be set robustly and excellently reproducibly on the control choke. Fluctuations in the gas inlet pressure and combustion chamber repercussions have practically no influence on the gas volume flow. Due to the constantly low pressure gradient at the variable throttle, measuring points can be found in a simple way that deliver suitable pressure values over the entire working range.
  • the volumetric flow controller according to the invention is also suitable for the correction of the gas / air ratio, wherein in the most favorable case the control choke is set as a function of the gas type or on the basis of a ⁇ signal.
  • the control choke can be formed by an adjustably arranged slide a throttle a shutter interchangeable diaphragms or similar throttle arrangements. It can also be combined with the controlled valve in a common housing, so that the volume flow controller is formed by an individually manageable and salable assembly.
  • the differential pressure tap preferably includes a first tap channel upstream and a second tap channel downstream of the throttle of the actuating throttle.
  • This tap channels can be formed by separate lines, housing bores, tubes tubes or other outwardly fluid-tight means. They are preferably unbranched and connect the differential pressure tap directly to the fluid drive.
  • the fluid drive is preferably a diaphragm actuator with a diaphragm which separates two working chambers from each other in a drive housing. Neither of the two working chambers has any connection to the atmosphere. Rather, one of the two working chambers is connected to the upstream tap channel, while the other working chamber is connected to the downstream tap channel.
  • the valve is operated solely on the basis of the pressure difference at the control throttle.
  • a spring means that generates a force which is opposite to the actuating force of the fluid drive.
  • This spring means can be arranged within the fluid actuator or otherwise, for example in or on the valve. It can be configured or arranged as required adjustable or adjustable. For example, it can be supported with one end on the diaphragm of the actuator and with its other end to a screw adjustable via an abutment. However, in the preferred embodiment, the abutment is fixed, i. immovable trained.
  • the control throttle is preferably designed to be adjustable, wherein for adjustment in the simplest case, a manual adjustment can be provided. This can, for example, serve to adapt to different gas qualities or to otherwise set a connected burner.
  • an actuator such as.
  • An electric drive may be provided, with which the control choke, for example. For regulating ⁇ values is adjusted as desired.
  • FIG. 1 illustrates a gas burner 1 with associated gas supply 2, to which a gas supply duct 3, e.g. heard in the form of a line.
  • a gas fitting 4 is arranged, which comprises a plurality of valves or valve or throttle devices in one or more individual housings.
  • the gas valve include, for example, one or two gas safety valves 5, 6, in addition to actuator 7, 8, which may be formed, for example, as a pull magnet.
  • the gas fitting 4 is a volumetric flow controller 9, which serves to provide the burner 1 a defined gas flow, regardless of the back pressure of the burner 1.
  • the volumetric flow controller 9 includes a controlled valve 10 and a control throttle 11, which are arranged in series one behind the other , This control throttle 11 is downstream of the valve 10, i.
  • valve 10 is provided with a fluid actuator 12, for adjusting the free flow cross-section of the control throttle 11, for example, a hand-held device 13, e.g. in the form of a set screw. With this the position of a slider or a throttle valve can be adjusted.
  • a hand-held device 13 e.g. in the form of a set screw.
  • Other adjustable throttling devices are suitable for replacing the adjusting throttle 11.
  • the fluid drive 12 serves to drive the valve closure member of the valve 10, for example.
  • the membrane 15 divides in a housing 16 from two working chambers 17, 18, which are sealed to the outside.
  • the working chambers 17, 18 are connected to a differential pressure tap 19, with which the pending at the control throttle 11 pressure drop is detected.
  • To the differential pressure tap 19 include a first tap channel 120 and a second tap channel 21.
  • the tap channel 20 passes The tap between the valve 10 and the control throttle 11 pending pressure in the working chamber 17.
  • the tap channel 21 passes the pending between the control throttle 11 and the burner 1 pressure to the working chamber 18. Both tap channels 20, 21 can be arranged in close proximity to the control throttle 11 be.
  • the pressurization of the working chamber 17 tends to close the valve 10.
  • the pressurization of the working chamber 18 tends to open the valve 10th
  • the valve 10 is associated with a spring means 22 which specifies a desired value for the differential pressure at the control throttle 11.
  • the spring means 22 is an adjustment 23, for example. Assigned in the form of a screw.
  • the pressure control is effected because the prevailing between the working chambers 17, 18 pressure difference and the force generated therefrom on the diaphragm 15 with the force of the spring means 22 in accordance.
  • the spring characteristic of the spring means 20 is preferably flat, so that small pressure changes cause a large adjusting movement.
  • the volume flow controller 9 described so far operates as follows:
  • gas is at a given possibly fluctuating pressure.
  • Open the gas safety valves 5, 6 gas flows through the valve 10 and the control throttle 11 to the burner 1.
  • FIG. 1 A modified embodiment of the volumetric flow controller is shown in FIG. The above description applies accordingly.
  • an engine control device 24 is provided, with which the control throttle 11 can be actuated.
  • the actuation takes place, for example, by means of a control device 25 which is connected via a ⁇ -probe 26, e.g. can detect the composition of the exhaust gas supplied by the burner 1. If necessary, the actuator 24 can also be controlled or regulated using other values.
  • the volumetric flow controller 1 consists of a fluid drive 12 for actuating a pressure control valve 10 and a downstream control throttle 11, at which the applied pressure drop is picked up and passed directly through unbranched pressure tapper channels 20, 21 to the fluid actuator 12.
  • This has a membrane au, one side of which is acted upon by the pressure in front of the control throttle 11 and the other side of the pressure behind the control throttle 11. Their deflection is thus determined by the pressure difference across the control throttle 11, are thus kept constant.
  • a downstream gas consumer can be operated independently of other influences with a constant gas volume flow.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)

Abstract

The controller (9) has a controlled valve (10), which is provided with a fluid drive. An adjustment throttle (11) is provided downstream to the controlled valve, where the throttle is designed in an adjustable manner. A difference pressure tap is provided for controlling the fluid drive. The fluid drive is sealed against the environment, and including a spring unit (22) in order to provide a pressure difference- desired value. The throttle is connected with a drive device.

Description

Die Erfindung betrifft einen Volumenstromregler, insbesondere für Heizungsbrenner.The invention relates to a volumetric flow controller, in particular for heating burners.

Brenner von Heizungsanlagen müssen mit definierten Gasströmen oder auch Gas/Luft-Gemischen definierter Zusammensetzung versorgt werden. Dazu dient bspw. gemäß der DE 103 40 045 A1 ein Verhältnisregler, der an einer zu dem Brenner bzw. seiner Gasdüse führenden Leitung verschiedene Drücke abgreift und diese zur Ansteuerung eines Fluidstellantriebs für ein Ventil nutzt. Der Fluidstellantrieb weist dazu eine Membran auf, die in einem Antriebsgehäuse zwei Kammern abteilt. Eine der Kammern steht mit dem Umgebungsdruck in Verbindung. Damit bildet der Verhältnisdruckregler einen Gasstrom in Abhängigkeit vom Umgebungsluftdruck.Burners of heating systems must be supplied with defined gas flows or gas / air mixtures of defined composition. This is used, for example, according to the DE 103 40 045 A1 a ratio regulator, which picks up different pressures at a line leading to the burner or its gas nozzle and uses these to control a fluid actuator for a valve. The fluid actuator has for this purpose a membrane which divides two chambers in a drive housing. One of the chambers communicates with the ambient pressure. Thus, the ratio pressure regulator forms a gas flow depending on the ambient air pressure.

Insbesondere bei Brennern mit geringen Druckverlusten und bei klein dimensionierten Armaturen wird der Gasdurchsatz bei Volllast zunehmend unabhängig von dem an dem Druckregler ausgangsseitig eingestellten Gasdruck. Als Folge bleibt der eingestellte Gasdurchfluss gelegentlich nicht konstant oder neigt zu Schwingungserscheinungen. Größer dimensionierte Armaturen sind teuer. Höhere Druckabfälle an dem Brenner erfordern einen höheren Gaseingangsdruck, der wiederum die kleinen Armaturen überfordert.Especially with burners with low pressure drops and in small-sized fittings, the gas flow at full load is increasingly independent of the pressure set on the output side gas pressure. As a result, the set gas flow is occasionally not constant or tends to vibrate. Larger sized fittings are expensive. Higher pressure drops on the burner require a higher gas inlet pressure, which in turn overwhelms the small valves.

Davon ausgehend ist es Aufgabe der Erfindung, einen verbesserten Volumenstromregler anzugeben. Insbesondere soll dieser verbesserte Regeleigenschaften aufweisen.On this basis, it is an object of the invention to provide an improved volume flow regulator. In particular, this should have improved control properties.

Diese Aufgabe wird mit dem erfindungsgemäßen Volumenstromregler gelöst, der sich insbesondere für Heizungsbrenner, aber auch für andere Anwendungen eignet. Der erfindungsgemäße Volumenstromregler weist ein gesteuertes Ventil auf, das mit einem Fluidantrieb bspw. in Form eines Membranantriebs versehen ist. Stromabwärts zu dem gesteuerten Ventil ist eine Stelldrossel angeordnet, an der ein Differenzdruckabgriff versehen ist. Dieser umfasst einen ersten Druckabgriff stromaufwärts zu der Stelldrossel und einen zweiten Druckabgriff stromabwärts zu dieser. Über den Differenzdruckabgriff wird ein Differenzdrucksignal zu dem Fluidantrieb geleitet, der entsprechend dem Differenzdrucksignal eine Stellbewegung ausführt. Die Regelung erfolgt dabei in dem Sinne, dass das gesteuerte Ventil Differenzdruckänderungen gegensteuert. Wird der Differenzdruck zu groß, wird das Ventil tendenziell geschlossen, während es tendenziell geöffnet wird, wenn der Differenzdruck an der Stelldrossel zu gering wird.This object is achieved with the volume flow regulator according to the invention, which is particularly suitable for heating burners, but also for other applications. The volume flow regulator according to the invention has a controlled valve, which is provided with a fluid drive, for example, in the form of a diaphragm drive. Downstream of the controlled valve, a control throttle is arranged, on which a differential pressure tap is provided. This includes a first pressure tap upstream of the control throttle and a second pressure tap downstream thereof. About the Differenzdruckabgriff a differential pressure signal is passed to the fluid drive, which performs an adjusting movement according to the differential pressure signal. The regulation takes place in the sense that the controlled valve counteracts differential pressure changes. If the differential pressure becomes too great, the valve tends to close while it tends to open when the differential pressure at the variable throttle becomes too low.

Durch diese Maßnahme wird der geregelte Volumenstrom von dem Gegendruck des Brenners vollkommen unabhängig. Die Festlegung der Größe des Gasvolumenstroms erfolgt durch eine Gasdruckregelung anhand des Differenzdrucks an der Stelldrossel. Der Regler hält dabei die Druckdifferenz an der Stelldrossel konstant. Dadurch ist der Gasvolumenstrom im Idealfall nur noch von der Einstellposition der Stelldrossel abhängig. Die Gasmenge ist dann von dem feien Drosselquerschnitt linear abhängig. Sie lässt sich an der Stelldrossel robust und hervorragend reproduzierbar einstellen. Schwankungen des Gaseingangsdrucks und Brennraumrückwirkungen haben praktisch keinen Einfluss auf den Gasvolumenstrom. Durch das konstant niedrige Druckgefälle an der Stelldrossel können auf einfache Weise Messstellen aufgefunden werden, die über den ganzen Arbeitsbereich passende Druckwerte liefern.By this measure, the controlled volume flow of the back pressure of the burner is completely independent. The determination of the size of the gas volume flow is effected by a gas pressure control based on the differential pressure at the control throttle. The controller keeps the pressure difference at the control throttle constant. As a result, the gas volume flow in the ideal case only depends on the setting position of the actuating choke. The amount of gas is then linearly dependent on the fine throttle cross-section. It can be set robustly and excellently reproducibly on the control choke. Fluctuations in the gas inlet pressure and combustion chamber repercussions have practically no influence on the gas volume flow. Due to the constantly low pressure gradient at the variable throttle, measuring points can be found in a simple way that deliver suitable pressure values over the entire working range.

Der erfindungsgemäße Volumenstromregler eignet sich auch zur Korrektur des Gas/Luft-Verhältnisses, wobei im günstigsten Fall die Stelldrossel in Abhängigkeit von der Gasart oder anhand eines λ-Signals eingestellt wird.The volumetric flow controller according to the invention is also suitable for the correction of the gas / air ratio, wherein in the most favorable case the control choke is set as a function of the gas type or on the basis of a λ signal.

Die Stelldrossel kann durch einen verstellbar angeordneten Schieber eine Drosselklappe eine Jalousie auswechselbarer Blenden oder ähnliche Drosselanordnungen gebildet sein. Sie kann außerdem mit dem gesteuerten Ventil in einem gemeinsamen Gehäuse vereinigt sein, so dass der volumenstromregler durch eine einzeln handhabbare und verkaufsfähige Baugruppe gebildet wird.The control choke can be formed by an adjustably arranged slide a throttle a shutter interchangeable diaphragms or similar throttle arrangements. It can also be combined with the controlled valve in a common housing, so that the volume flow controller is formed by an individually manageable and salable assembly.

Der Differenzdruckabgriff umfasst vorzugsweise einen ersten Abgriffkanal stromaufwärts und einen zweiten Abgriffkanal stromabwärts zu der Drosselstelle der Stelldrossel. Diese Abgriffskanäle können durch gesonderte Leitungen, Gehäusebohrungen, Rohre Schläuche oder sonstige nach außen fluiddichte Mittel gebildet sein. Sie sind vorzugsweise unverzweigt und verbinden den Differenzdruckabgriff unmittelbar mit dem Fluidantrieb.The differential pressure tap preferably includes a first tap channel upstream and a second tap channel downstream of the throttle of the actuating throttle. This tap channels can be formed by separate lines, housing bores, tubes tubes or other outwardly fluid-tight means. They are preferably unbranched and connect the differential pressure tap directly to the fluid drive.

Der Fluidantrieb ist vorzugsweise ein Membranstellantrieb mit einer Membran, die in einem Antriebsgehäuse zwei Arbeitskammern voneinander trennt. Keine der beiden Arbeitskammern hat eine Verbindung zur Atmosphäre. Vielmehr ist eine der beiden Arbeitskammer mit dem stromaufwärtigen Abgriffkanal verbunden, während die andere Arbeitskammer mit dem stromabwärtigen Abgriffkanal verbunden ist. Damit wird das Ventil ausschließlich anhand der Druckdifferenz an der Stelldrossel betätigt. Als Mittel zur Vorgabe eines Druckwerts dient bspw. Ein Federmittel, dass eine Kraft erzeugt, die der Stellkraft des Fluidantriebs entgegengerichtet ist. Dieses Federmittel kann innerhalb des Fluidstellantriebs oder anderweitig, bspw. in oder an dem Ventil, angeordnet sein. Es kann bedarfsweise verstellbar oder einstellbar ausgebildet oder angeordnet sein. Beispielsweise kann es sich mit einem Ende an der Membran des Stellantriebs und mit seinem anderen Ende an einem über eine Schraube verstellbaren Widerlager abstützen. In der bevorzugten Ausführungsform ist das Widerlager jedoch fest, d.h. unverstellbar ausgebildet.The fluid drive is preferably a diaphragm actuator with a diaphragm which separates two working chambers from each other in a drive housing. Neither of the two working chambers has any connection to the atmosphere. Rather, one of the two working chambers is connected to the upstream tap channel, while the other working chamber is connected to the downstream tap channel. Thus, the valve is operated solely on the basis of the pressure difference at the control throttle. As a means for setting a pressure value is used, for example. A spring means that generates a force which is opposite to the actuating force of the fluid drive. This spring means can be arranged within the fluid actuator or otherwise, for example in or on the valve. It can be configured or arranged as required adjustable or adjustable. For example, it can be supported with one end on the diaphragm of the actuator and with its other end to a screw adjustable via an abutment. However, in the preferred embodiment, the abutment is fixed, i. immovable trained.

Die Stelldrossel ist vorzugsweise verstellbar ausgebildet, wobei zur Verstellung im einfachsten Fall eine manuelle Verstellmöglichkeit vorgesehen sein kann. Diese kann bspw. dazu dienen, eine Anpassung an unterschiedliche Gasqualitäten vorzunehmen oder einen angeschlossenen Brenner anderweitig einzustellen.The control throttle is preferably designed to be adjustable, wherein for adjustment in the simplest case, a manual adjustment can be provided. This can, for example, serve to adapt to different gas qualities or to otherwise set a connected burner.

Alternativ kann ein Stellantrieb, wie bspw. ein elektrischer Antrieb vorgesehen sein, mit dem die Stelldrossel, bspw. zum Einregulieren von λ-Werten wie gewünscht verstellt wird.Alternatively, an actuator, such as. An electric drive may be provided, with which the control choke, for example. For regulating λ values is adjusted as desired.

Weitere Einzelheiten vorteilhafter Ausführungsformen Erfindung ergeben sich aus der Zeichnung, der Beschreibung oder Ansprüchen.Further details of advantageous embodiments of the invention will become apparent from the drawings, the description or claims.

In der Zeichnung sind Ausführungsbeispiele der Erfindung veranschaulicht. Es zeigen:

Fig. 1
den erfindungsgemäßen Volumenstromregler in einer Gasarmaturenanordnung zur Versorgung eines Brenners ihn schematisierter Darstellung und
Fig. 2
eine Gasarmaturenanordnung mit einem Volumenstromregler in einer abgewandelten Ausführungsform in schematisierter Darstellung.
In the drawings, embodiments of the invention are illustrated. Show it:
Fig. 1
the volumetric flow controller according to the invention in a gas fitting arrangement for supplying a burner him schematic representation and
Fig. 2
a gas valve assembly with a volumetric flow controller in a modified embodiment in a schematic representation.

In Figur 1 ist ein Gasbrenner 1 mit zugehöriger Gasversorgung 2 veranschaulicht, zu der ein Gaszuführungskanal 3, z.B. in Form einer Leitung gehört. In diesem ist eine Gasarmatur 4 angeordnet, die in einem oder in mehreren einzelnen Gehäusen mehrere Ventile bzw. Ventil- oder Drosseleinrichtungen umfasst. Zu der Gasarmatur gehören bspw. ein oder zwei Gassicherheitsventile 5, 6, nebst Stellantrieb 7, 8, der bspw. als Zugmagnet ausgebildet sein kann. Außerdem gehört zu der Gasarmatur 4 ein Volumenstromregler 9, der dazu dient, dem Brenner 1 einen definierten Gasstrom zu liefern und zwar unabhängig von dem Gegendruck des Brenners 1. Der Volumenstromregler 9 enthält ein gesteuertes Ventil 10 und eine Stelldrossel 11, die seriell hintereinander angeordnet sind. Diese Stelldrossel 11 ist stromabwärts zu dem Ventil 10, d.h. zwischen diesem und dem Brenner 1 angeordnet. Während das Ventil 10 mit einem Fluidstellantrieb 12 versehen ist, dient zur Einstellung des freien Durchflussquerschnitts der Stelldrossel 11 bspw. eine Handstelleinrichtung 13, z.B. in Form einer Stellschraube. Mit dieser kann die Position eines Schiebers oder eine Drosselklappe verstellt werden. Andere verstellbare Drosseleinrichtungen sind zum Ersatz der Stelldrossel 11 geeignet.Figure 1 illustrates a gas burner 1 with associated gas supply 2, to which a gas supply duct 3, e.g. heard in the form of a line. In this, a gas fitting 4 is arranged, which comprises a plurality of valves or valve or throttle devices in one or more individual housings. To the gas valve include, for example, one or two gas safety valves 5, 6, in addition to actuator 7, 8, which may be formed, for example, as a pull magnet. In addition, the gas fitting 4 is a volumetric flow controller 9, which serves to provide the burner 1 a defined gas flow, regardless of the back pressure of the burner 1. The volumetric flow controller 9 includes a controlled valve 10 and a control throttle 11, which are arranged in series one behind the other , This control throttle 11 is downstream of the valve 10, i. between this and the burner 1 is arranged. While the valve 10 is provided with a fluid actuator 12, for adjusting the free flow cross-section of the control throttle 11, for example, a hand-held device 13, e.g. in the form of a set screw. With this the position of a slider or a throttle valve can be adjusted. Other adjustable throttling devices are suitable for replacing the adjusting throttle 11.

Der Fluidantrieb 12 dient zum Antrieb des Ventilverschlussglieds des Ventils 10, bspw. in Form eines Stellkegels, der gegen eine Öffnung verstellt wird. Die Verstellung erfolgt über eine Stellstange 14, die mit einer Membran 15 verbunden ist. Die Membran 15 teilt in einem Gehäuse 16 zwei Arbeitskammern 17, 18 ab, die nach außen hin abgedichtet sind. Die Arbeitskammern 17, 18 sind an einem Differenzdruckabgriff 19 angeschlossen, mit dem der an der Stelldrossel 11 anstehende Druckabfall erfasst wird. Zu dem Differenzdruckabgriff 19 gehören ein erster Abgriffkanal 120 und ein zweiter Abgriffkanal 21. Der Abgriffkanal 20 leitet den zwischen dem Ventil 10 und der Stelldrossel 11 anstehenden Druck in die Arbeitskammer 17. Der Abgriffkanal 21 leitet den zwischen der Stelldrossel 11 und dem Brenner 1 anstehenden Druck zu der Arbeitskammer 18. Beide Abgriffkanäle 20, 21 können in unmittelbarer Nähe zu der Stelldrossel 11 angeordnet sein. Die Druckbeaufschlagung der Arbeitskammer 17 führt tendenziell zum Schließen des Ventils 10. Die Druckbeaufschlagung der Arbeitskammer 18 führt tendenziell zum Öffnen des Ventils 10.The fluid drive 12 serves to drive the valve closure member of the valve 10, for example. In the form of a locking cone which is adjusted against an opening. The adjustment takes place via an adjusting rod 14, which is connected to a membrane 15. The membrane 15 divides in a housing 16 from two working chambers 17, 18, which are sealed to the outside. The working chambers 17, 18 are connected to a differential pressure tap 19, with which the pending at the control throttle 11 pressure drop is detected. To the differential pressure tap 19 include a first tap channel 120 and a second tap channel 21. The tap channel 20 passes The tap between the valve 10 and the control throttle 11 pending pressure in the working chamber 17. The tap channel 21 passes the pending between the control throttle 11 and the burner 1 pressure to the working chamber 18. Both tap channels 20, 21 can be arranged in close proximity to the control throttle 11 be. The pressurization of the working chamber 17 tends to close the valve 10. The pressurization of the working chamber 18 tends to open the valve 10th

Dem Ventil 10 ist ein Federmittel 22 zugeordnet, das einen Sollwert für den Differenzdruck an der Stelldrossel 11 vorgibt. Den Federmittel 22 ist eine Einstelleinrichtung 23 bspw. in Form einer Stellschraube zugeordnet. Die Druckreglung wird bewirkt, weil die zwischen den Arbeitskammern 17, 18 herrschende Druckdifferenz und die daraus an der Membran 15 erzeugte Kraft mit der Kraft des Federmittels 22 in Übereinstimmung bleibt. Die Federkennlinie des Federmittels 20 ist vorzugsweise flach, so dass geringe Druckänderungen eine große Stellbewegung hervorrufen.The valve 10 is associated with a spring means 22 which specifies a desired value for the differential pressure at the control throttle 11. The spring means 22 is an adjustment 23, for example. Assigned in the form of a screw. The pressure control is effected because the prevailing between the working chambers 17, 18 pressure difference and the force generated therefrom on the diaphragm 15 with the force of the spring means 22 in accordance. The spring characteristic of the spring means 20 is preferably flat, so that small pressure changes cause a large adjusting movement.

Der insoweit beschriebene Volumenstromregler 9 arbeitet wie folgt:The volume flow controller 9 described so far operates as follows:

In Betrieb steht an dem Eingang der Gasarmatur Gas mit einem gegebenen möglicherweise schwankenden Druck an. Öffnen die Gassicherheitsventile 5, 6 strömt Gas durch das Ventil 10 und die Stelldrossel 11 zu dem Brenner 1. Dabei entsteht an der Stelldrossel 11 ein Druckabfall, der über den Differenzdruckabgriff 19 zu dem Fluidantrieb 12 geleitet wird. Dies bewirkt, dass das Ventil 10 nun einem solchen Druck am Eingang der Stelldrossel 11 einreguliert, dass der Druckabfall über der Stelldrossel 11 einen konstanten gewünschten Wert annimmt. Dies gilt unabhängig von dem Gegendruck den der Brenner 1 verursacht sowie auch unabhängig von dem Gasdruck der an dem Eingang der Gasarmatur 4 anliegt. Ebenso gilt dies unabhängig von dem umgebenden Atmosphärendruck.In operation, at the inlet of the gas fitting, gas is at a given possibly fluctuating pressure. Open the gas safety valves 5, 6 gas flows through the valve 10 and the control throttle 11 to the burner 1. This results in the control throttle 11, a pressure drop, which is passed via the differential pressure tap 19 to the fluid drive 12. This causes the valve 10 now regulated such a pressure at the input of the control throttle 11 that the pressure drop across the control throttle 11 assumes a constant desired value. This applies regardless of the back pressure caused by the burner 1 and also independent of the gas pressure which abuts against the input of the gas fitting 4. This also applies regardless of the surrounding atmospheric pressure.

Somit ist an der Stelldrossel 11 der gewünschte Gasvolumenstrom präzise vorgegeben und einstellbar.Thus, at the control throttle 11 of the desired gas flow rate is precisely predetermined and adjustable.

Eine abgewandelte Ausführungsform des Volumenstromreglers geht aus Figur 2 hervor. Die vorstehende Beschreibung gilt entsprechend. Jedoch ist anstelle der Handstelleinrichtung 13 eine Motorstelleinrichtung 24 vorgesehen, mit der die Stelldrossel 11 betätigt werden kann. Die Betätigung erfolgt bspw. mittels einer Steuereinrichtung 25, die über eine λ-Sonde 26 z.B. die Zusammensetzung des von dem Brenner 1 gelieferten Abgases erfassen kann. Bedarfsweise kann der Stellantrieb 24 auch anhand anderer Werte gesteuert oder geregelt betrieben werden.A modified embodiment of the volumetric flow controller is shown in FIG. The above description applies accordingly. However, instead of the manual control device 13, an engine control device 24 is provided, with which the control throttle 11 can be actuated. The actuation takes place, for example, by means of a control device 25 which is connected via a λ-probe 26, e.g. can detect the composition of the exhaust gas supplied by the burner 1. If necessary, the actuator 24 can also be controlled or regulated using other values.

Der erfindungsgemäße Volumenstromregler 1 besteht aus einem Fluidantrieb 12 zur Betätigung eines Druckregelventils 10 und einer nachgeschalteten Stelldrossel 11, an der der anstehende Druckabfall abgegriffen und unmittelbar durch unverzweigte Druckabgriffkanäle 20, 21 zu dem Fluidstellantrieb 12 geleitet wird. Dieser weist eine Membran au, deren eine Seite von dem Druck vor der Stelldrossel 11 und deren andere Seite von dem Druck hinter der Stelldrossel 11 beaufschlagt ist. Ihre Auslenkung wird somit von der Druckdifferenz an der Stelldrossel 11 bestimmt, sind somit konstant gehalten wird. Dadurch kann ein nachgeschalteter Gasverbraucher unabhängig von sonstigen Einflüssen mit konstantem Gasvolumenstrom betrieben werden.The volumetric flow controller 1 according to the invention consists of a fluid drive 12 for actuating a pressure control valve 10 and a downstream control throttle 11, at which the applied pressure drop is picked up and passed directly through unbranched pressure tapper channels 20, 21 to the fluid actuator 12. This has a membrane au, one side of which is acted upon by the pressure in front of the control throttle 11 and the other side of the pressure behind the control throttle 11. Their deflection is thus determined by the pressure difference across the control throttle 11, are thus kept constant. As a result, a downstream gas consumer can be operated independently of other influences with a constant gas volume flow.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11
Brennerburner
22
Gasversorgunggas supply
33
GaszuführungskanalGas supply channel
44
Gasarmaturgas train
55
GassicherheitsventilGas safety valve
66
GassicherheitsventilGas safety valve
77
Stellantriebactuator
88th
Stellantriebactuator
99
VolumenstromreglerVolume flow controller
1010
VentilValve
1111
Stelldrosseladjusting throttle
1212
Fluidantriebfluid drive
1313
HandstelleinrichtungHand adjusting device
1414
Stellstangecontrol rod
1515
Membranemembrane
1616
Gehäusecasing
1717
Arbeitskammerworking chamber
1818
Arbeitskammerworking chamber
1919
DifferenzdruckabgriffDifferenzdruckabgriff
2020
AbgriffkanalAbgriffkanal
2121
AbgriffkanalAbgriffkanal
2222
Federmittelspring means
2323
Einstelleinrichtungadjustment
2424
Stellantriebactuator

Claims (16)

Volumenstromregler (9), insbesondere für Heizungsbrenner,
mit einem gesteuerten Ventil (10), das mit einem Fluidantrieb (12) versehen ist,
mit einer Stelldrossel (11), die dem gesteuerten Ventil (10) nachgeordnet und mit einem Differenzdruckabgriff (19) versehen ist, der zur Steuerung des Fluidantriebs (12) dient.Volume flow regulator (9), in particular for heating burners,
with a controlled valve (10) provided with a fluid drive (12),
with an actuating throttle (11) which is arranged downstream of the controlled valve (10) and provided with a differential pressure tap (19) which serves to control the fluid drive (12). Volumenstromregler nach Anspruch 1, dadurch gekennzeichnet, dass die Stelldrossel (11) einen verstellbar angeordneten Schieber aufweist.Volumetric flow regulator according to claim 1, characterized in that the adjusting throttle (11) has an adjustably arranged slide. Volumenstromregler nach Anspruch 1, dadurch gekennzeichnet, dass der Differenzdruckabgriff (19) einen ersten Abgriffkanal (20) stromaufwärts und einen zweiten Abgriffkanal (21) stromabwärts einer Drosselstelle der Stelldrossel (11) umfasst.Volume flow regulator according to claim 1, characterized in that the differential pressure tap (19) comprises a first tap channel (20) upstream and a second tap channel (21) downstream of a throttle point of the actuating throttle (11). Volumenstromregler nach Anspruch 1, dadurch gekennzeichnet, dass der Fluidantrieb (12) ein Membranestellantrieb mit einer Membrane (15) ist, die in einem Gehäuse (16) zwei Arbeitskammern (17, 18) voneinander trennt.Volume flow regulator according to claim 1, characterized in that the fluid drive (12) is a diaphragm actuator with a diaphragm (15) in a housing (16) two working chambers (17, 18) separated from each other. Volumenstromregler nach Anspruch 3 und 4, dadurch gekennzeichnet, dass der erste Abgriffkanal (20) nur mit einer der Arbeitskammern (17) und der zweite Abgriffkanal (21) nur mit der anderen der Arbeitskammern (18) verbunden ist.Volume flow regulator according to claim 3 and 4, characterized in that the first tap channel (20) with only one of the working chambers (17) and the second tap channel (21) only with the other of the working chambers (18) is connected. Volumenstromregler nach Anspruch 5, dadurch gekennzeichnet, dass der erste Abgriffkanal (20) mit derjenigen Arbeitskammer (17) verbunden ist, deren Druckbeaufschlagung das Ventil in Öffnungsrichtung bewegt.Volume flow regulator according to claim 5, characterized in that the first tap channel (20) with that working chamber (17) is connected, the pressurization of which moves the valve in the opening direction. Volumenstromregler nach Anspruch 5, dadurch gekennzeichnet, dass der zweite Abgriffkanal (21) mit derjenigen Arbeitskammer (18) verbunden ist, deren Druckbeaufschlagung das Ventil in Schließrichtung bewegt.Volume flow regulator according to claim 5, characterized in that the second tap channel (21) with that working chamber (18) is connected, the pressurization of which moves the valve in the closing direction. Volumenstromregler nach Anspruch 5, dadurch gekennzeichnet, dass die beiden Abgriffkanäle (20, 21) unmittelbar mit den Arbeitskammern (17, 18) des Fluidantriebs (12) verbunden sind.Volumetric flow regulator according to claim 5, characterized in that the two tap channels (20, 21) are directly connected to the working chambers (17, 18) of the fluid drive (12). Volumenstromregler nach Anspruch 1, dadurch gekennzeichnet, dass die Stelldrossel (11) verstellbar ausgebildet ist.Volumetric flow regulator according to claim 1, characterized in that the adjusting throttle (11) is adjustable. Volumenstromregler nach Anspruch 1, dadurch gekennzeichnet, dass das Ventil (10) in Schließstellung einen Mindestgasfluss gestattet.Volume flow regulator according to claim 1, characterized in that the valve (10) in the closed position allows a minimum gas flow. Volumenstromregler nach Anspruch 1, dadurch gekennzeichnet, dass das Ventil (10) in Ruhestellung offen ist.Volume flow regulator according to claim 1, characterized in that the valve (10) is open in the rest position. Volumenstromregler nach Anspruch 1, dadurch gekennzeichnet, dass der Fluidantrieb (12) gegen die Umgebung abgeschlossen ist.Volume flow regulator according to claim 1, characterized in that the fluid drive (12) is closed against the environment. Volumenstromregler nach Anspruch 1, dadurch gekennzeichnet, dass der Fluidantrieb (12) ein Federmittel (22) aufweist, um einen Druckdifferenz-Sollwert vorzugeben.Volumetric flow regulator according to claim 1, characterized in that the fluid drive (12) has a spring means (22) to specify a pressure difference setpoint. Volumenstromregler nach Anspruch 13, dadurch gekennzeichnet, dass das Federmittel (22) einstellbar angeordnet oder ausgebildet ist.Volume flow regulator according to claim 13, characterized in that the spring means (22) is arranged adjustable or formed. Volumenstromregler nach Anspruch 1, dadurch gekennzeichnet, dass die Stelldrossel (11) manuell betätigbar ist.Volumetric flow regulator according to claim 1, characterized in that the control throttle (11) is manually operable. Volumenstromregler nach Anspruch 1, dadurch gekennzeichnet, dass die Stelldrossel (11) mit einer Antriebseinrichtung verbunden ist.Volumetric flow regulator according to claim 1, characterized in that the actuating throttle (11) is connected to a drive device.
EP07005099A 2006-07-28 2007-03-13 Flowrate regulating device Withdrawn EP1882882A2 (en)

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DE102006034917A DE102006034917B4 (en) 2006-07-28 2006-07-28 Volume flow controller

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US8839815B2 (en) 2011-12-15 2014-09-23 Honeywell International Inc. Gas valve with electronic cycle counter
US8899264B2 (en) 2011-12-15 2014-12-02 Honeywell International Inc. Gas valve with electronic proof of closure system
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US8947242B2 (en) 2011-12-15 2015-02-03 Honeywell International Inc. Gas valve with valve leakage test
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US9995486B2 (en) 2011-12-15 2018-06-12 Honeywell International Inc. Gas valve with high/low gas pressure detection
CN102692020A (en) * 2012-04-27 2012-09-26 成都炭素有限责任公司 Adjustable gas flow combustion apparatus
US9657946B2 (en) 2012-09-15 2017-05-23 Honeywell International Inc. Burner control system
US9234661B2 (en) 2012-09-15 2016-01-12 Honeywell International Inc. Burner control system
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US10215291B2 (en) 2013-10-29 2019-02-26 Honeywell International Inc. Regulating device
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