EP0863339B1 - Gas regulator - Google Patents

Gas regulator Download PDF

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Publication number
EP0863339B1
EP0863339B1 EP97119101A EP97119101A EP0863339B1 EP 0863339 B1 EP0863339 B1 EP 0863339B1 EP 97119101 A EP97119101 A EP 97119101A EP 97119101 A EP97119101 A EP 97119101A EP 0863339 B1 EP0863339 B1 EP 0863339B1
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EP
European Patent Office
Prior art keywords
stroke
gas
spring
anchor
regulating
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.)
Expired - Lifetime
Application number
EP97119101A
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German (de)
French (fr)
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EP0863339A2 (en
EP0863339A3 (en
Inventor
Michael Obser
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.)
JCI REGELUNGSTECHNIK GmbH
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JCI REGELUNGSTECHNIK GmbH
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Publication of EP0863339A2 publication Critical patent/EP0863339A2/en
Publication of EP0863339A3 publication Critical patent/EP0863339A3/en
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Publication of EP0863339B1 publication Critical patent/EP0863339B1/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N1/00Regulating fuel supply
    • F23N1/005Regulating fuel supply using electrical or electromechanical means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00Valves, nozzles or pumps
    • F23N2235/12Fuel valves
    • F23N2235/14Fuel valves electromagnetically operated
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/8593Systems
    • Y10T137/86493Multi-way valve unit
    • Y10T137/86718Dividing into parallel flow paths with recombining
    • Y10T137/86759Reciprocating

Definitions

  • the invention relates to a gas control unit for a gas fan burner in heating systems a housing which has a gas inlet side chamber, a gas outlet side chamber and at least one passage opening with valve seat, an actuator with lifting armature and at least one valve plate, a control magnet device with a coil assigned to the lifting armature and a closing spring acting on the actuator and a current source for delivering two different control currents for the coil, wherein the actuator has a stop element which is arranged at a control gap distance from the stop surface of a tensioning device, the stop element striking the stop surface during an actuator opening stroke and an additional spring being tensioned when the actuator opening stroke continues.
  • Gas actuators of the type described are for a two-stage Operation of the gas fan burner set up.
  • the burner switches temperature-controlled between a first and a second firing stage, the two firing stages have different opening strokes are assigned to the gas control unit.
  • the first Stage is also required to ignite the burner.
  • a gas control device of the construction described above is known from EP 0 005 395 A1.
  • the opening stroke for the first stage is a fixed one Attacks limited.
  • the opening stroke is within the by the stops given range at most the coil current adjustable. A reliable setting is not guaranteed.
  • From GB 1 297 335 A is a gas control device for a two-stage Operation of a burner known to begin with first valve for a relatively narrow gas passage opening having.
  • a second valve is also provided is assigned to a larger gas passage opening. The opening of the valves mentioned is by adjusting the coil current causes.
  • Gas actuators with coil arrangements consisting of two coils are also known from practice.
  • the coils are successively excited according to the desired opening stroke.
  • by virtue of of the voluminous coils have such gas actuators considerable dimensions, weights and a high electrical Power. This is unsatisfactory.
  • the invention has for its object a gas actuator of the structure described at the beginning, its Opening stroke set operationally in the first stage can be a reliable and energetic to enable optimal operation of the gas fan burner.
  • the task is with a gas actuator with the input described features solved according to the invention, that the control gap distance and thus the opening stroke of the Actuator adjustable by means of the clamping device and is changeable.
  • the power source is preferably one Constant current source, which two have different amounts Provides control currents for the coil. she gives an intermediate for a first opening stroke, for example 40% and 60% of the nominal current and for a second Opening stroke between 70% and 90% of the nominal current predetermined control current. Rated current under normalized conditions at nominal voltage adjusting current flow through the coil.
  • a first embodiment provides that the actuator Additional spring that passes between a housing-fixed Support surface and one movably arranged on the actuator as well as adjustable by the tensioning device Spring washer is biased, and that the stop element is firmly connected to the actuator and the spring washer takes off from the seat of the tensioning device if that Actuator executes its opening stroke.
  • the spring washer forms the stop surface, which in this embodiment is resiliently supported on the additional spring.
  • the actuator with valve disc remains in the constant control current position specified by the prestressed spring washer.
  • the first opening stroke corresponds to the control gap distance between the spring washer and the stop element when there is no current Coil and is adjustable by means of the tensioning device variable.
  • the coil with a higher, also predetermined and constant control current is applied. This is dimensioned so large that the magnetic force is sufficient to Actuator against the spring forces of the closing spring and the Open additional spring.
  • the invention does not exclude two or more Additional springs are provided, each additional spring in the described way between a housing-fixed support surface and one movably arranged on the actuator Spring washer is biased. Every spring washer is one Clamping device and one with control distance on the actuator attached attached stop element. With more suitable Coordination of the control gap distances and specification of suitable ones Control flows result in a gas actuator, the opening strokes can perform in several stages and also for a three-stage or multi-stage operation of a gas fan burner suitable is.
  • the actuator one to the Lifting rod has connected control rod, which the Passed through opening and through one of the lifting anchor opposite housing bore is guided.
  • the additional spring and the spring washer are on one by the Housing bore guided extension of the control rod arranged, at the end a locking ring as a stop element is attached.
  • the tensioning device preferably consists one cover and one in a housing bore the adjusting screw inserted in the cover.
  • the lid closes an outside chamber receiving the extension of the housing.
  • the adjusting screw has an end face blind hole surrounded by an annular support surface on, in the end of the extension carrying the locking ring is so insertable that the spring washer at currentless coil on the ring-shaped support surface of the adjusting screw rests.
  • the arrangement described draws through a particularly simple and space-saving Construction from.
  • the control rod is appropriately divided formed and has a attachable to the lifting anchor Valve disc carrier on whose facing away from the lifting anchor End can be screwed to the extension.
  • the stop surface spring-supported on the additional spring In the embodiment described above, the stop surface spring-supported on the additional spring.
  • the additional spring is arranged and supported on the lifting anchor the stop element is spring-movable.
  • the tensioning device has an adjusting screw which is fixed in a housing Coil core of the control magnet device is arranged and forms the stop surface in this embodiment.
  • the stop element is expediently connected to a bolt, which is movable in a longitudinal bore of the lifting anchor is guided, the additional spring between the Stop element and a support surface of the lifting anchor clamped is.
  • the additional spring is preferably in an end Lifting anchor receiving chamber inserted. Furthermore is the lifting anchor against an end face of the Movable core.
  • the gas actuator shown in Fig. 1 is for one two-stage gas forced draft burner in heating systems. It has a housing 1 which has a chamber on the gas inlet side 3, a gas outlet-side chamber 2 and two through openings 4 each having a valve seat 5. To the Construction of the gas control unit also includes an actuator 6 with lifting armature 7 and valve plate 8, a control magnet device with a coil 9 assigned to the lifting armature 7 and a closing spring 10 acting on the actuator 6 and a power source, not shown, for supplying two the amount according to different tax flows for the Coil 9.
  • the actuator 6 also includes a Additional spring 11 acting in the closing direction, which between a support surface 12 fixed to the housing and one on the actuator 6 movably arranged and by a clamping device 13 adjustable spring washer 14 is biased, and has an end stop element 15.
  • the stop element 15 is in the closed position shown when the coil is de-energized of the actuator 6 with a control gap distance a arranged to the spring washer 14. With an actuator opening stroke it strikes according to the given Control current on the prestressed spring washer 14 and lifts the spring washer 14 from the seat of the tensioning device 13 from.
  • the operation of the gas actuator is based on the 2 understandable, which on the actuator 6th acting spring force depending on the opening stroke.
  • a current is applied to the coil which is significantly smaller than the nominal current and in Embodiment is approximately 50% of the nominal current, pulls the lifting armature 7 and lifts the actuator against the force the closing spring 10 until the stop element 15 to the Spring washer 14 strikes.
  • the spring force that is now resulting from the spring constants of the closing spring 10 and the additional spring 11 is assembled increases by leaps and bounds and becomes so large that the magnetic force of the current
  • the coil is not sufficient to keep the valve closed to open.
  • the actuator 6 and the valve plate attached to it 8 remain in position with constant current, specified by the setting of the spring washer 14 is.
  • the opening stroke of the actuator corresponds to the control gap distance a and is 2 mm in the exemplary embodiment.
  • the Control gap distance a and thus the opening stroke is by means of the tensioning device 13 is adjustable and changeable.
  • the coil 9 with a between 70% and 90% of the nominal current specified control current applied.
  • the control current for the larger opening stroke is dimensioned that the magnetic force of the coil 9 is sufficient to Actuator 6 against the sum of the spring forces from the closing spring 10 and additional spring 11 to open.
  • the embodiment is operated with a control current that is 80% of the nominal current, with an opening stroke of sets a total of 6 mm.
  • the current source is a constant current source, which for a first opening stroke between 40% and 60% of Rated current and one for a second opening stroke between 70% and 90% of the nominal control current emits.
  • the current source is a constant current source, which for a first opening stroke between 40% and 60% of Rated current and one for a second opening stroke between 70% and 90% of the nominal control current emits.
  • the Actuator 6 is an actuator rod connected to the lifting armature 7 16, which passes through the openings 4 and by a lifting armature 7 opposite Housing bore 17 is guided.
  • the additional spring 11 and the Spring washer 14 are on a through the housing bore 17th guided extension 18 of the actuating rod 16 arranged the end of which is a locking ring as a stop element 15 is attached.
  • the tensioning device 13 is in the embodiment from a lid 19 and one into one Threaded hole of the cover 19 used adjusting screw 20.
  • the lid 19 closes an outside, the extension receiving chamber of the housing 1.
  • the adjusting screw 20 has an end face, of an annular Support surface surrounded blind hole 21, in which the Retaining ring 15 carrying end of the extension 18 such is insertable that the spring washer 14 when de-energized Coil 9 on the annular support surface of the adjusting screw 20 rests.
  • FIG. 1 shows that the actuating rod 16 is divided and one on the valve anchor carrier can be fastened to the lifting anchor, whose end facing away from the lifting anchor 7 with the extension 18 is screwable.
  • the gas actuating device is the additional spring 11 arranged on the lifting anchor 7 and supports the stop element 15 ' spring movable.
  • the tensioning device 13 has an adjusting screw 20 'on that in a housing-fixed coil core 22 of the control magnet device is arranged and the Stop surface 14 'forms.
  • the stop element 15 'with control gap distance a to Stop surface 14 'of the clamping device is arranged. It strikes the stop surface during an actuator opening stroke 14 'on. If the actuator opening stroke continues the additional spring 11 supporting the stop element 15 ' curious; excited.
  • FIG. 3 shows that the stop element 15 ' a bolt 23 is connected, which is in a longitudinal bore of the lifting armature 7 is movably guided, and that the Additional spring 11 between the stop element 15 'and one Support surface 24 of the lifting armature 7 is clamped.
  • the additional spring 11 is in an end receiving chamber of the lifting armature 7 arranged and thereby guided laterally. you also recognizes that the lifting armature 7 against an end Stop surface 25 of the coil core 22 is movable. This Stop surface 25 limits the maximum opening stroke.

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

Description

Die Erfindung betrifft ein Gas-Stellgerät für einen Gasgebläsebrenner in Heizungsanlagen mit
   einem Gehäuse, das eine gaseinlassseitige Kammer, eine gasauslassseitige Kammer und mindestens eine Durchlassöffnung mit Ventilsitz aufweist,
   einem Stellglied mit Hubanker und mindestens einem Ventilteller,
   einer Steuermagneteinrichtung mit einer dem Hubanker zugeordneten Spule sowie einer auf das Stellglied wirkenden Schließfeder und
   einer Stromquelle zur Abgabe von zwei dem Betrage nach unterschiedlichen Steuerströmen für die Spule,
wobei das Stellglied ein Anschlagelement aufweist, das mit Steuerspaltabstand zur Anschlagfläche einer Spanneinrichtung angeordnet ist, wobei das Anschlagelement bei einem Stellglied-Öffnungshub an der Anschlagfläche anschlägt und bei Fortsetzung des Stellglied-Öffnungshubes eine Zusatzfeder gespannt wird.
The invention relates to a gas control unit for a gas fan burner in heating systems
a housing which has a gas inlet side chamber, a gas outlet side chamber and at least one passage opening with valve seat,
an actuator with lifting armature and at least one valve plate,
a control magnet device with a coil assigned to the lifting armature and a closing spring acting on the actuator and
a current source for delivering two different control currents for the coil,
wherein the actuator has a stop element which is arranged at a control gap distance from the stop surface of a tensioning device, the stop element striking the stop surface during an actuator opening stroke and an additional spring being tensioned when the actuator opening stroke continues.

Gas-Stellgeräte der beschriebenen Art sind für einen zweistufigen Betrieb des Gasgebläsebrenners eingerichtet. Bei einem zweistufigen Betrieb schaltet der Brenner temperaturgesteuert zwischen einer ersten und einer zweiten Brennstufe, wobei den beiden Brennstufen unterschiedliche Öffnungshübe des Gas-Stellgerätes zugeordnet sind. Die erste Stufe wird ferner zum Zünden des Brenners benötigt.Gas actuators of the type described are for a two-stage Operation of the gas fan burner set up. at In a two-stage operation, the burner switches temperature-controlled between a first and a second firing stage, the two firing stages have different opening strokes are assigned to the gas control unit. The first Stage is also required to ignite the burner.

Ein Gas-Stellgerät des eingangs beschriebenen Aufbaus ist aus EP 0 005 395 A1 bekannt. Bei der bekannten Ausführung ist der Öffnungshub für die erste Stufe durch fest vorgegebene Anschläge begrenzt. Der Öffnungshub ist innerhalb des durch die Anschläge vorgegebenen Bereiches allenfalls über den Spulenstrom einstellbar. Eine funktionssichere Einstellung ist hierbei nicht gewährleistet.A gas control device of the construction described above is known from EP 0 005 395 A1. In the known version the opening stroke for the first stage is a fixed one Attacks limited. The opening stroke is within the by the stops given range at most the coil current adjustable. A reliable setting is not guaranteed.

Aus GB 1 297 335 A ist ein Gas-Stellgerät für einen zweistufigen Betrieb eines Brenners bekannt, das zunächst ein erstes Ventil für eine relativ schmale Gasdurchlassöffnung aufweist. Außerdem ist ein zweites Ventil vorgesehen, das einer größeren Gasdurchlassöffnung zugeordnet ist. Das Öffnen der genannten Ventile wird durch Einstellung des Spulenstroms bewirkt.From GB 1 297 335 A is a gas control device for a two-stage Operation of a burner known to begin with first valve for a relatively narrow gas passage opening having. A second valve is also provided is assigned to a larger gas passage opening. The opening of the valves mentioned is by adjusting the coil current causes.

Gas-Stellgeräte mit Spulenanordnungen aus zwei Spulen sind auch aus der Praxis bekannt. Die Spulen werden nacheinander nach Maßgabe des gewünschten Öffnungshubes erregt. Aufgrund der voluminösen Spulen haben derartige Gas-Stellgeräte beachtliche Abmessungen, Gewichte und eine hohe elektrische Leistung. Dies ist unbefriedigend.Gas actuators with coil arrangements consisting of two coils are also known from practice. The coils are successively excited according to the desired opening stroke. by virtue of of the voluminous coils have such gas actuators considerable dimensions, weights and a high electrical Power. This is unsatisfactory.

Der Erfindung liegt die Aufgabe zugrunde, ein Gas-Stellgerät des eingangs beschriebenen Aufbaus anzugeben, dessen Öffnungshub in der ersten Stufe betriebsmäßig eingestellt werden kann, um einen funktionssicheren und energetisch optimalen Betrieb des Gasgebläsebrenners zu ermöglichen. The invention has for its object a gas actuator of the structure described at the beginning, its Opening stroke set operationally in the first stage can be a reliable and energetic to enable optimal operation of the gas fan burner.

Die Aufgabe wird bei einem Gas-Stellgerät mit den eingangs beschriebenen Merkmalen erfindungsgemäß dadurch gelöst, dass der Steuerspaltabstand und damit der Öffnungshub des Stellgliedes mittels der Spanneinrichtung einstellbar und veränderbar ist. Die Stromquelle ist vorzugsweise eine Konstantstromquelle, welche zwei dem Betrage nach unterschiedliche Steuerströme für die Spule bereitstellt. Sie gibt beispielsweise für einen ersten Öffnungshub einen zwichen 40 % und 60 % des Nennstromes und für einen zweiten Öffnungshub einen zwischen 70 % und 90 % des Nennstromes vorgegebenen Steuerstrom ab. Nennstrom bezeichnet den sich unter normierten Bedingungen bei Nennspannung einstellenden Stromfluß durch die Spule.The task is with a gas actuator with the input described features solved according to the invention, that the control gap distance and thus the opening stroke of the Actuator adjustable by means of the clamping device and is changeable. The power source is preferably one Constant current source, which two have different amounts Provides control currents for the coil. she gives an intermediate for a first opening stroke, for example 40% and 60% of the nominal current and for a second Opening stroke between 70% and 90% of the nominal current predetermined control current. Rated current under normalized conditions at nominal voltage adjusting current flow through the coil.

Es bestehen verschiedene Möglichkeiten der weiteren Ausgestaltung des erfindungsgemäßen Gas-Stellgerätes. Eine erste Ausführungsform sieht vor, daß das Stellglied die Zusatzfeder durchfaßt, welche zwischen einer gehäusefesten Stützfläche und einer auf dem Stellglied beweglich angeordneten sowie von der Spanneinrichtung verstellbaren Federscheibe vorgespannt ist, und daß das Anschlagelement an das Stellglied fest angeschlossen ist und die Federscheibe von dem Sitz der Spanneinrichtung abhebt, wenn das Stellglied seinen Öffnungshub ausführt. Die Federscheibe bildet die Anschlagfläche, welche bei dieser Ausführungsform federbeweglich an der Zusatzfeder abgestützt ist.There are various options for further design of the gas control device according to the invention. A first embodiment provides that the actuator Additional spring that passes between a housing-fixed Support surface and one movably arranged on the actuator as well as adjustable by the tensioning device Spring washer is biased, and that the stop element is firmly connected to the actuator and the spring washer takes off from the seat of the tensioning device if that Actuator executes its opening stroke. The spring washer forms the stop surface, which in this embodiment is resiliently supported on the additional spring.

Wird die Spule mit einem Steuerstrom beaufschlagt, der in einen dem ersten Öffnungshub zugeordneten Bereich fällt, öffnet das Stellglied gegen die Kraft der Schließfeder, bis das Anschlagelement an die von der Zusatzfeder beaufschlagte Federscheibe anschlägt. Die sich nun einstellende Federkraft, die sich aus den Federkonstanten der Schließfeder und der Zusatzfeder zusammensetzt, ist so groß, daß die Magnetkraft der stromdurchflossenen Spule nicht ausreicht, um das Stellglied weiter zu öffnen. Das Stellglied mit Ventilteller verharrt bei konstantem Steuerstrom in der durch die vorgespannte Federscheibe vorgegebenen Position. Der erste Öffnungshub entspricht dem Steuerspaltabstand zwischen Federscheibe und Anschlagelement bei stromloser Spule und ist mittels der Spanneinrichtung einstell- und veränderbar. Soll ein größerer, der zweiten Brennstufe des Gasgebläsebrenners zugeordneter Öffnungshub ausgeführt werden, wird die Spule mit einem höheren, ebenfalls vorgegebenen und konstanten Steuerstrom beaufschlagt. Dieser ist so groß bemessen, daß die Magnetkraft ausreicht, um das Stellglied gegen die Federkräfte der Schließfeder und der Zusatzfeder zu öffnen.If the coil is supplied with a control current, which in an area assigned to the first opening stroke falls, opens the actuator against the force of the closing spring until the stop element to that acted upon by the additional spring Spring washer strikes. The now emerging Spring force resulting from the spring constants of the closing spring and the additional spring is so large that the magnetic force of the current-carrying coil is insufficient, to open the actuator further. The actuator with valve disc remains in the constant control current position specified by the prestressed spring washer. The first opening stroke corresponds to the control gap distance between the spring washer and the stop element when there is no current Coil and is adjustable by means of the tensioning device variable. Should a larger, the second burning stage of the Open stroke assigned to the gas blower burner be, the coil with a higher, also predetermined and constant control current is applied. This is dimensioned so large that the magnetic force is sufficient to Actuator against the spring forces of the closing spring and the Open additional spring.

Die Erfindung schließt nicht aus, daß zwei oder mehr Zusatzfedern vorgesehen sind, wobei jede Zusatzfeder in der beschriebenen Weise zwischen einer gehäusefesten Stützfläche und einer auf dem Stellglied beweglich angeordneten Federscheibe vorgespannt ist. Jeder Federscheibe ist eine Spanneinrichtung sowie ein mit Steuerabstand auf dem Stellglied befestigtes Anschlagelement zugeordnet. Bei geeigneter Abstimmung der Steuerspaltabstände und Vorgabe geeigneter Steuerströme resultiert ein Gas-Stellgerät, das Öffnunghübe in mehreren Stufen ausführen kann und auch für einen drei- oder mehrstufigen Betrieb eines Gasgebläsebrenners geeignet ist.The invention does not exclude two or more Additional springs are provided, each additional spring in the described way between a housing-fixed support surface and one movably arranged on the actuator Spring washer is biased. Every spring washer is one Clamping device and one with control distance on the actuator attached attached stop element. With more suitable Coordination of the control gap distances and specification of suitable ones Control flows result in a gas actuator, the opening strokes can perform in several stages and also for a three-stage or multi-stage operation of a gas fan burner suitable is.

In weiterer Ausgestaltung der beschriebenen Ausführungsform lehrt die Erfindung, daß das Stellglied eine an den Hubanker angeschlossene Stellstange aufweist, welche die Durchlaßöffnung durchfaßt und durch eine dem Hubanker gegenüberliegende Gehäusebohrung geführt ist. Die Zusatzfeder und die Federscheibe sind auf einem durch die Gehäusebohrung geführten Fortsatz der Stellstange angeordnet, an deren Ende ein Sicherungsring als Anschlagelement befestigt ist. Die Spanneinrichtung besteht vorzugsweise aus einem Deckel und einer in eine Gehäusebohrung des Deckels eingesetzten Einstellschraube. Der Deckel verschließt eine außenseitige, den Fortsatz aufnehmende Kammer des Gehäuses. Die Einstellschraube weist eine stirnseitige, von einer ringförmigen Stützfläche umgebene Sackbohrung auf, in die das den Sicherungsring tragende Ende des Fortsatzes derart einführbar ist, daß die Federscheibe bei stromloser Spule auf der ringförmigen Stützfläche der Einstellschraube aufliegt. Die beschriebene Anordnung zeichnet sich durch einen besonders einfachen und raumsparenden Aufbau aus. Die Stellstange ist dabei zweckmäßig geteilt ausgebildet und weist einen an dem Hubanker befestigbaren Ventiltellerträger auf, dessen von dem Hubanker abgewandtes Ende mit dem Fortsatz verschraubbar ist.In a further embodiment of the described embodiment teaches the invention that the actuator one to the Lifting rod has connected control rod, which the Passed through opening and through one of the lifting anchor opposite housing bore is guided. The additional spring and the spring washer are on one by the Housing bore guided extension of the control rod arranged, at the end a locking ring as a stop element is attached. The tensioning device preferably consists one cover and one in a housing bore the adjusting screw inserted in the cover. The lid closes an outside chamber receiving the extension of the housing. The adjusting screw has an end face blind hole surrounded by an annular support surface on, in the end of the extension carrying the locking ring is so insertable that the spring washer at currentless coil on the ring-shaped support surface of the adjusting screw rests. The arrangement described draws through a particularly simple and space-saving Construction from. The control rod is appropriately divided formed and has a attachable to the lifting anchor Valve disc carrier on whose facing away from the lifting anchor End can be screwed to the extension.

Bei der zuvor beschriebenen Ausführungsform ist die Anschlagfläche federbeweglich an der Zusatzfeder abgestützt. Gemäß einer anderen Ausführungsform der erfindungsgemäßen Lehre ist die Zusatzfeder am Hubanker angeordnet und stützt das Anschlagelement federbeweglich. Die Spanneinrichtung weist eine Einstellschraube auf, die in einem gehäusefesten Spulenkern der Steuermagneteinrichtung angeordnet ist und bei dieser Ausführungsform die Anschlagfläche bildet. Das Anschlagelement ist zweckmäßig an einen Bolzen angeschlossen, der in einer Längsbohrung des Hubankers beweglich geführt ist, wobei die Zusatzfeder zwischen dem Anschlagelement und einer Stützfläche des Hubankers eingespannt ist. Vorzugsweise ist die Zusatzfeder in eine endseitige Aufnahmekammer des Hubankers eingesetzt. Ferner ist der Hubanker gegen eine stirnseitige Anschlagfläche des Spulenkerns bewegbar.In the embodiment described above, the stop surface spring-supported on the additional spring. According to another embodiment of the invention The additional spring is arranged and supported on the lifting anchor the stop element is spring-movable. The tensioning device has an adjusting screw which is fixed in a housing Coil core of the control magnet device is arranged and forms the stop surface in this embodiment. The The stop element is expediently connected to a bolt, which is movable in a longitudinal bore of the lifting anchor is guided, the additional spring between the Stop element and a support surface of the lifting anchor clamped is. The additional spring is preferably in an end Lifting anchor receiving chamber inserted. Furthermore is the lifting anchor against an end face of the Movable core.

Im folgenden wird die Erfindung anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung erläutert. Es zeigen schematisch

Fig. 1
einen Längsschnitt durch ein Gas-Stellgerät,
Fig. 2
die Kraftkennlinie der zu dem Gas-Stellgerät in Fig. 1 gehörenden Federanordnung.
Fig. 3
eine weitere Ausführungsform des Gas-Stellgerätes, ausschnittsweise und im Längsschnitt.
In the following the invention will be explained with reference to a drawing showing only one embodiment. They show schematically
Fig. 1
a longitudinal section through a gas control device,
Fig. 2
the force characteristic of the spring arrangement belonging to the gas actuating device in FIG. 1.
Fig. 3
a further embodiment of the gas control device, in sections and in longitudinal section.

Das in Fig. 1 dargestellte Gas-Stellgerät ist für einen zweistufigen Gasgebläsebrenner in Heizungsanlagen bestimmt. Es besitzt ein Gehäuse 1, das eine gaseinlaßseitige Kammer 3, eine gasauslaßseitige Kammer 2 sowie zwei Durchlaßöffnungen 4 mit jeweils einem Ventilsitz 5 aufweist. Zum Aufbau des Gas-Stellgerätes gehören ferner ein Stellglied 6 mit Hubanker 7 und Ventilteller 8, eine Steuermagneteinrichtung mit einer dem Hubanker 7 zugeordneten Spule 9 sowie einer auf das Stellglied 6 wirkenden Schließfeder 10 und eine nicht dargestellte Stromquelle zur Abgabe von zwei dem Betrage nach unterschiedlichen Steuerströmen für die Spule 9. Das Stellglied 6 durchfaßt eine ebenfalls in Schließrichtung wirkende Zusatzfeder 11, die zwischen einer gehäusefesten Stützfläche 12 und einer auf dem Stellglied 6 beweglich angeordneten sowie von einer Spanneinrichtung 13 verstellbaren Federscheibe 14 vorgespannt ist, und weist ein endseitiges Anschlagelement 15 auf. Das Anschlagelement 15 ist bei stromloser Spule in der dargestellten Schließstellung des Stellglieds 6 mit einem Steuerspaltabstand a zur Federscheibe 14 angeordnet. Bei einem Stellgliedöffnungshub schlägt es nach Maßgabe des vorgegebenen Steuerstroms an der vorgespannten Federscheibe 14 an und hebt die Federscheibe 14 von dem Sitz der Spanneinrichtung 13 ab.The gas actuator shown in Fig. 1 is for one two-stage gas forced draft burner in heating systems. It has a housing 1 which has a chamber on the gas inlet side 3, a gas outlet-side chamber 2 and two through openings 4 each having a valve seat 5. To the Construction of the gas control unit also includes an actuator 6 with lifting armature 7 and valve plate 8, a control magnet device with a coil 9 assigned to the lifting armature 7 and a closing spring 10 acting on the actuator 6 and a power source, not shown, for supplying two the amount according to different tax flows for the Coil 9. The actuator 6 also includes a Additional spring 11 acting in the closing direction, which between a support surface 12 fixed to the housing and one on the actuator 6 movably arranged and by a clamping device 13 adjustable spring washer 14 is biased, and has an end stop element 15. The stop element 15 is in the closed position shown when the coil is de-energized of the actuator 6 with a control gap distance a arranged to the spring washer 14. With an actuator opening stroke it strikes according to the given Control current on the prestressed spring washer 14 and lifts the spring washer 14 from the seat of the tensioning device 13 from.

Die Funktionsweise des Gas-Stellgerätes wird anhand der Fig. 2 verständlich, welche die auf das Stellglied 6 wirkende Federkraft in Abhängigkeit des Öffnungshubes darstellt. Wenn die Spule mit einem Steuerstrom beaufschlagt wird, der wesentlich kleiner ist als der Nennstrom und im Ausführungsbeispiel ca. 50 % des Nennstromes beträgt, zieht der Hubanker 7 an und hebt das Stellglied gegen die Kraft der Schließfeder 10, bis das Anschlagelement 15 an die Federscheibe 14 anschlägt. Die sich nun einstellende Federkraft, die sich aus den Federkonstanten der Schließfeder 10 und der Zusatzfeder 11 zusammensetzt, nimmt sprunghaft zu und wird so groß, daß die Magnetkraft der stromdurchflossenen Spule nicht ausreicht, um das Ventil weiter zu öffnen. Das Stellglied 6 und die daran befestigten Ventilteller 8 verharren bei konstantem Strom in der Position, die durch die Einstellung der Federscheibe 14 vorgegeben ist. Der Öffnungshub des Stellglieds entspricht dem Steuerspaltabstand a und beträgt im Ausführungsbeispiel 2 mm. Der Steuerspaltabstand a und damit der Öffnungshub ist mittels der Spanneinrichtung 13 einstell- und veränderbar.The operation of the gas actuator is based on the 2 understandable, which on the actuator 6th acting spring force depending on the opening stroke. When a current is applied to the coil which is significantly smaller than the nominal current and in Embodiment is approximately 50% of the nominal current, pulls the lifting armature 7 and lifts the actuator against the force the closing spring 10 until the stop element 15 to the Spring washer 14 strikes. The spring force that is now resulting from the spring constants of the closing spring 10 and the additional spring 11 is assembled, increases by leaps and bounds and becomes so large that the magnetic force of the current The coil is not sufficient to keep the valve closed to open. The actuator 6 and the valve plate attached to it 8 remain in position with constant current, specified by the setting of the spring washer 14 is. The opening stroke of the actuator corresponds to the control gap distance a and is 2 mm in the exemplary embodiment. The Control gap distance a and thus the opening stroke is by means of the tensioning device 13 is adjustable and changeable.

Soll das Gas-Stellgerät einen zweiten, größeren Öffnungshub ausführen, so wird die Spule 9 mit einem zwischen 70 % und 90 % des Nennstromes vorgegebenen Steuerstrom beaufschlagt. Der Steuerstrom für den größeren Öffnungshub ist so bemessen, daß die Magnetkraft der Spule 9 ausreicht, um das Stellglied 6 gegen die Summe der Federkräfte aus Schließfeder 10 und Zusatzfeder 11 zu öffnen. Im Ausführungsbeispiel wird mit einem Steuerstrom gearbeitet, der 80 % des Nennstromes beträgt, wobei sich ein Öffnungshub von insgesamt 6 mm einstellt.Should the gas control device have a second, larger opening stroke execute, the coil 9 with a between 70% and 90% of the nominal current specified control current applied. The control current for the larger opening stroke is dimensioned that the magnetic force of the coil 9 is sufficient to Actuator 6 against the sum of the spring forces from the closing spring 10 and additional spring 11 to open. In the embodiment is operated with a control current that is 80% of the nominal current, with an opening stroke of sets a total of 6 mm.

Die Stromquelle ist eine Konstantstromquelle, welche für einen ersten Öffnungshub einen zwischen 40 % und 60 % des Nennstromes und für einen zweiten Öffnungshub einen zwischen 70 % und 90 % des Nennstromes vorgegebenen Steuerstrom abgibt. Durch eine Strombegrenzung auf Werte unterhalb des Nennstromes werden eine störende Erwärmung der Spule 9 sowie die Remanenzkraft des Elektromagneten reduziert. Arbeitet man mit Nennstrom, so kann die Remanenzkraft so groß werden, daß das Stellglied 6 nicht zurückfährt, wenn der Steuerstrom vom Wert der zweiten Stufe auf den Wert der ersten Stufe umgeschaltet wird.The current source is a constant current source, which for a first opening stroke between 40% and 60% of Rated current and one for a second opening stroke between 70% and 90% of the nominal control current emits. By limiting the current to values below of the nominal current are a disruptive heating of the Coil 9 and the remanence of the electromagnet are reduced. If you work with nominal current, the remanence force can become so large that the actuator 6 does not returns when the control current of the value of the second Level is switched to the value of the first level.

Die konstruktive Ausführung des Stellglieds 6 und der Spanneinrichtung 13 soll anhand der Fig. 1 im folgenden näher erläutert werden. Der Fig. 1 entnimmt man, daß das Stellglied 6 eine an den Hubanker 7 angeschlossene Stellstange 16 aufweist, welche die Durchlaßöffnungen 4 durchfaßt und durch eine dem Hubanker 7 gegenüberliegende Gehäusebohrung 17 geführt ist. Die Zusatzfeder 11 und die Federscheibe 14 sind auf einem durch die Gehäusebohrung 17 geführten Fortsatz 18 der Stellstange 16 angeordnet, an dessen Ende ein Sicherungsring als Anschlagelement 15 befestigt ist. Die Spanneinrichtung 13 besteht im Ausführungsbeispiel aus einem Deckel 19 und einer in eine Gewindebohrung des Deckels 19 eingesetzten Einstellschraube 20. Der Deckel 19 verschließt eine außenseitige, den Fortsatz aufnehmende Kammer des Gehäuses 1. Die Einstellschraube 20 weist eine stirnseitige, von einer ringförmigen Stützfläche umgebene Sackbohrung 21 auf, in die das den Sicherungsring 15 tragende Ende des Fortsatzes 18 derart einführbar ist, daß die Federscheibe 14 bei stromloser Spule 9 auf der ringförmigen Stützfläche der Einstellschraube 20 aufliegt. Schließlich entnimmt man der Fig. 1, daß die Stellstange 16 geteilt ausgebildet ist und einen an dem Hubanker befestigbaren Ventiltellerträger aufweist, dessen von dem Hubanker 7 abgewandtes Ende mit dem Fortsatz 18 verschraubbar ist.The design of the actuator 6 and Clamping device 13 is shown in FIG. 1 below are explained in more detail. 1 that the Actuator 6 is an actuator rod connected to the lifting armature 7 16, which passes through the openings 4 and by a lifting armature 7 opposite Housing bore 17 is guided. The additional spring 11 and the Spring washer 14 are on a through the housing bore 17th guided extension 18 of the actuating rod 16 arranged the end of which is a locking ring as a stop element 15 is attached. The tensioning device 13 is in the embodiment from a lid 19 and one into one Threaded hole of the cover 19 used adjusting screw 20. The lid 19 closes an outside, the extension receiving chamber of the housing 1. The adjusting screw 20 has an end face, of an annular Support surface surrounded blind hole 21, in which the Retaining ring 15 carrying end of the extension 18 such is insertable that the spring washer 14 when de-energized Coil 9 on the annular support surface of the adjusting screw 20 rests. Finally, FIG. 1 shows that the actuating rod 16 is divided and one on the valve anchor carrier can be fastened to the lifting anchor, whose end facing away from the lifting anchor 7 with the extension 18 is screwable.

Bei der in Fig. 3 dargestellten Ausführungsform des erfindungsgemäßen Gas-Stellgerätes ist die Zusatzfeder 11 am Hubanker 7 angeordnet und stützt das Anschlagelement 15' federbeweglich. Die Spanneinrichtung 13 weist eine Einstellschraube 20' auf, die in einem gehäusefesten Spulenkern 22 der Steuermagneteinrichtung angeordnet ist und die Anschlagfläche 14' bildet. Auch bei dieser Ausführungsform ist das Anschlagelement 15' mit Steuerspaltabstand a zur Anschlagfläche 14' der Spanneinrichtung angeordnet. Es schlägt bei einem Stellgliedöffnungshub an der Anschlagfläche 14' an. Bei Fortsetzung des Stellgliedöffnungshubes wird die das Anschlagelement 15' stützende Zusatzfeder 11 gespannt.In the embodiment of the The gas actuating device according to the invention is the additional spring 11 arranged on the lifting anchor 7 and supports the stop element 15 ' spring movable. The tensioning device 13 has an adjusting screw 20 'on that in a housing-fixed coil core 22 of the control magnet device is arranged and the Stop surface 14 'forms. Also in this embodiment is the stop element 15 'with control gap distance a to Stop surface 14 'of the clamping device is arranged. It strikes the stop surface during an actuator opening stroke 14 'on. If the actuator opening stroke continues the additional spring 11 supporting the stop element 15 ' curious; excited.

Der Fig. 3 entnimmt man, daß das Anschlagelement 15' an einen Bolzen 23 angeschlossen ist, der in einer Längsbohrung des Hubankers 7 beweglich geführt ist, und daß die Zusatzfeder 11 zwischen dem Anschlagelement 15' und einer Stützfläche 24 des Hubankers 7 eingespannt ist. Die Zusatzfeder 11 ist in einer endseitigen Aufnahmekammer des Hubankers 7 angeordnet und dadurch seitlich geführt. Man erkennt ferner, daß der Hubanker 7 gegen eine stirnseitige Anschlagfläche 25 des Spulenkerns 22 bewegbar ist. Diese Anschlagfläche 25 begrenzt den maximalen Öffnungshub.3 shows that the stop element 15 ' a bolt 23 is connected, which is in a longitudinal bore of the lifting armature 7 is movably guided, and that the Additional spring 11 between the stop element 15 'and one Support surface 24 of the lifting armature 7 is clamped. The additional spring 11 is in an end receiving chamber of the lifting armature 7 arranged and thereby guided laterally. you also recognizes that the lifting armature 7 against an end Stop surface 25 of the coil core 22 is movable. This Stop surface 25 limits the maximum opening stroke.

Claims (10)

  1. A regulating device for a gas blower burner in heating installations with
    a housing (1), which has a chamber (3) on the gas inlet side, a gas outlet-side chamber (2) on the gas outlet side and at least one passage-way opening (4) with valve seat (5),
    a regulating element (6) with a stroke anchor (7) and at least one valve disc (8),
    a control magnet device with a coil (9) assigned to the stroke anchor (7) as well as a closure spring (10) acting on the regulating element (6) and
    a current source for the delivery of two control currents of differing magnitude for the coil (9),
    whereby the regulating element (6) has a stop element (15, 15'), which is arranged with a control gap distance (a) to the stop face (14, 14') of a clamping device (13), whereby the stop element (15, 15') strikes against the stop face (14, 14') with an opening stroke of the regulating element and an auxiliary spring (11) is put under tension with the continuation of the opening stroke of the regulating element, characterised in that the control gap distance (a) and thus the opening stroke of the regulating element (6) can be adjusted and changed by means of the clamping device.
  2. The gas regulating device according to claim 1, characterised in that the current source is a constant current source, which delivers a control current preset between 40 % and 60 % of the rated current for a first opening stroke and a control current preset between 70 % and 90 % of the rated current for a second opening stroke.
  3. The gas regulating device according to claim 1 or 2, characterised in that the regulating element (6) reaches through the auxiliary spring (11), which is pre-loaded between a supporting surface (12) fixed to the housing and a spring disc (14) arranged in a mobile fashion on the regulating element and adjustable by means of the clamping device, which spring disc forms the stop face, whereby the stop element (15) is firmly attached to the regulating element (6) and raises the spring disc (14) from the seat of the clamping device (13) when the regulating element (6) performs its opening stroke.
  4. The gas regulating device according to any one of claims 1 to 3, characterised in that the regulating element (6) has an adjusting rod (16) attached to the stroke anchor (7), which adjusting rod reaches through the passage-way opening (4) and is guided through a hole (17) of the housing lying opposite the stroke anchor (7), whereby the auxiliary spring (11) and the spring disc (14) are arranged on an extension (18) of the adjusting rod (16), said extension being guided through the hole (17) of the housing, and whereby a retaining ring as a stop element (15) is attached to the end of the extension (18).
  5. The gas regulating device according to claim 4, characterised in that the clamping device (13) comprises a cap (19) and an adjusting screw (20) inserted into a threaded hole of the cap (19), whereby the cap (19) closes an outer chamber of the housing (1), said outer chamber receiving the extension (18), and whereby the adjusting screw (20) has an end-face blind hole (21) surrounded by an annular supporting surface, into which blind hole the end of the extension (18) carrying the retaining ring can be introduced in such a way that the spring disc (14) lies on the annular supporting surface of the adjusting screw (20) in the presence of a currentless coil (9).
  6. The gas regulating device according to claim 4 or 5, characterised in that the adjusting rod (16) is designing split and has a valve disc support attachable to the stroke anchor (7), the end of which valve disc support facing away from the stroke anchor (7) is able to be screwed with the extension (18).
  7. The gas regulating device according to claim 1 or 2, characterised in that the auxiliary spring (11) is arranged on the stroke anchor (7) and supports the stop element (15') in a spring-mounted mobile manner, whereby the clamping device (13) has an adjusting screw (20'), which is arranged in a coil core (22) of the control magnet device, said coil core being fixed in the housing, and forms the stop face (14').
  8. The gas regulating device according to claim 7, characterised in that the stop element (15') is attached to a bolt (23), which is guided in a mobile manner in a longitudinal hole of the stroke anchor (7), and whereby the auxiliary spring (11) is clamped between the stop element (15') and a supporting surface (24) of the stroke anchor (7).
  9. The gas regulating device according to claim 8, characterised in that the auxiliary spring (11) is inserted in an end-side receiving chamber of the stroke anchor (7).
  10. The gas regulating device according to any one of claims 1 to 9, characterised in that the stroke anchor (7) can be moved against an end-side stop face (25) of the coil core (22).
EP97119101A 1996-12-05 1997-11-01 Gas regulator Expired - Lifetime EP0863339B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19650445 1996-12-05
DE19650445A DE19650445C1 (en) 1996-12-05 1996-12-05 Gas control for gas=blast burner in heating plant

Publications (3)

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EP0863339A2 EP0863339A2 (en) 1998-09-09
EP0863339A3 EP0863339A3 (en) 1998-11-04
EP0863339B1 true EP0863339B1 (en) 2003-04-02

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EP97119101A Expired - Lifetime EP0863339B1 (en) 1996-12-05 1997-11-01 Gas regulator

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EP (1) EP0863339B1 (en)
DE (2) DE19650445C1 (en)

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Also Published As

Publication number Publication date
US5816560A (en) 1998-10-06
DE59709692D1 (en) 2003-05-08
EP0863339A2 (en) 1998-09-09
DE19650445C1 (en) 1998-06-04
EP0863339A3 (en) 1998-11-04

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