EP1382907A1 - Device for regulating the gas flow to a burner - Google Patents

Device for regulating the gas flow to a burner Download PDF

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Publication number
EP1382907A1
EP1382907A1 EP03011571A EP03011571A EP1382907A1 EP 1382907 A1 EP1382907 A1 EP 1382907A1 EP 03011571 A EP03011571 A EP 03011571A EP 03011571 A EP03011571 A EP 03011571A EP 1382907 A1 EP1382907 A1 EP 1382907A1
Authority
EP
European Patent Office
Prior art keywords
valve
spindle
valve body
valve seat
valve spindle
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Withdrawn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
EP03011571A
Other languages
German (de)
French (fr)
Inventor
Andreas Kammerahl
Martin Petersmann
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.)
Elster Kromschroeder GmbH
Original Assignee
G Kromschroeder AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by G Kromschroeder AG filed Critical G Kromschroeder AG
Publication of EP1382907A1 publication Critical patent/EP1382907A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/005—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
    • 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
    • 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
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/04—Fail safe for electrical power failures
    • 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
    • F23N2235/14—Fuel valves electromagnetically operated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/20—Membrane valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/22—Fuel valves cooperating with magnets

Definitions

  • the invention relates to a device for regulating the gas flow in a gas line to a burner according to the preamble of claim 1.
  • control devices which act as actuators have a stepper motor, the control signals from a control unit, in particular to regulate the gas-combustion air ratio.
  • the stepper motor remains in its respective position, causing gas can flow through the passage opening.
  • control devices which have an actuator with a control membrane exhibit.
  • the control membrane compares the pressure in the outlet of the Device with a setpoint and generates depending on the comparison Actuating signal. Even with such a control device is only the control the gas supply, but not closing the gas supply to a burner possible.
  • the invention has for its object a device of the beginning to improve the type mentioned so that in addition to the control function It is possible to shut off the gas flow.
  • valve body or the Valve seat are designed such that the passage opening can be sealed, i. H. when the valve body is in the closed position, the The passage opening should be tight. This means that the requirements of the relevant DIN standards for the tightness of safety shut-off valves must be met have to.
  • the device is simply constructed and at the same time works as a control device and as a shut-off valve and thus replaces two components, namely a separate one Control valve and a shut-off valve. In this way, considerable costs can be saved become.
  • the homogeneous magnetic field from the moving coil and magnetic device centers the Moving coil geometrically precisely in the air gap of the magnetic device. That has the Advantage that the moving coil can be moved axially with practically no friction. The moving coil hovers practically contact-free in the annular air gap of the magnetic device.
  • the actuator thus works without any noteworthy hysteresis, what is an essential requirement for electrical control loops.
  • the moving coil receives control signals from a regulating / control device, which receives the output signals of a sensor as input variables, the Sensor is assigned to the burner and detects the state of combustion.
  • An essential development of the device according to the invention consists in that there is a control membrane between the valve stem and the moving coil located on the opposite side of the plunger from the pressure in the Output is applied, the plunger being supplied with a current which is proportional to the setpoint pressure in the outlet.
  • the plunger therefore serves as a setpoint generator for the control membrane.
  • the magnet device advantageously has a magnet whose magnetic field lines by means of guide elements made of magnetically conductive material in the Air gap are passed.
  • the guide elements are used in a known manner Bundling of the magnetic field lines in the air gap so that a homogeneous one in the air gap Magnetic field arises.
  • the magnet device has a ring-shaped permanent magnets, on the front plate-shaped guide elements connect and which concentric to form an air gap surrounds a cylindrical guide element.
  • the device is further characterized in that the moving coil with a Bracket is connected, which engages the valve stem. There is no fixed one Connection between bracket and valve stem. This has the advantage that the Centering of the moving coil in the annular gap by the magnetic field through the valve spindle is not adversely affected. If the moving coil is in a control process Moved in the axial direction, the bracket engages the valve spindle and postpones this.
  • the holder on has a cup-shaped end piece at its end facing the valve spindle, in which guides the valve stem.
  • the holder on its side facing the valve spindle End is spindle-shaped and that the valve spindle has a pot-shaped end piece in its end, in which the spindle-shaped end the bracket is guided.
  • the closing spring is preferably supported on the one hand by the valve spindle connected plate and on the other hand on the housing.
  • the valve seat is advantageously arranged on the inlet pressure side.
  • the valve seat or the valve body has a seal made of elastomeric material, preferably Rubber, on.
  • the valve body and valve seat are preferably articulated with one another connected. This design enables that in the closed position The passage opening is tightly closed.
  • valve body is on its side facing the valve seat with a pre-pressure compensation membrane connected.
  • FIG. 1 to Fig. 3 shows a device 1, which is not in a Gas line shown is installed, which also leads to a not shown Brenner leads.
  • the burner heats a boiler, for example.
  • the device 1 has a housing 2 with an input 3, an output 4 and a passage opening 5 arranged between entrance 3 and exit 4 on.
  • the passage opening 5 is provided with a valve seat 6.
  • This one Sealing lip 7 made of elastomeric gas-resistant material, preferably rubber on.
  • a metallic valve body 8 is assigned to the valve seat 6.
  • the valve body 8 is connected to a valve spindle 9, on which an actuator 10 acts.
  • the Actuator 10 has a plunger coil 11, which is in an annular air gap 12 hovers without contact in the magnetic field of a magnetic device.
  • the magnetic device consists essentially of an annular permanent magnet 13, which is concentrically a cylindrical guide element 14a made of magnetically conductive Material, here iron surrounds.
  • the end of the guide element 14a is plate-shaped Guide element 14b, which is located below the permanent magnet 13 located.
  • Another guiding element 15 made of iron is located above the permanent magnet 13.
  • the guide elements bundle the magnetic field line in such a way that Air gap 12 a homogeneous magnetic field is effective.
  • the magnetic field of the moving coil 11 and the magnetic device 13, 14, 15 centers the moving coil 11 geometrically precisely in the annular air gap 12, see above that the axial movement of the moving coil 11 is non-contact during control.
  • the Actuator 10 thus operates without any significant hysteresis.
  • the moving coil 11 is concentric on a hollow cylindrical holder 16 arranged.
  • the bracket 16 is at the end facing the valve stem is cup-shaped. In the cup-shaped end 16a, the valve spindle 9 led.
  • valve spindle 9 and the moving coil 11 are only non-positive, but not fixed are connected to each other, the centering of the moving coil 11 by the valve spindle 9 not negatively affected.
  • a closing spring 17 is supported on the one hand on a plate 18 with the valve spindle 9 is firmly connected and on the other hand on the housing 2. If the moving coil 11 becomes weak because the power supply to the moving coil is interrupted, the closing spring 17 presses the valve body 8 onto the valve seat 6.
  • the area of the passage opening 5 is shown enlarged in FIG. 5.
  • the valve body 8 is in a control position with the passage opening open.
  • the Valve seat 6 made of metal has a seal 7 made of elastomeric material in the form a sealing lip made of rubber, which seals with the metallic valve body 8 interacts.
  • the passage opening 5 sealed and the gas flow shut off.
  • the valve body 8 is with the Valve spindle 9 movable with the help of a gas-tight joint, not shown connected so that the valve body can make tilting movements Compensate tolerances in the sealing area.
  • valve seat 6 shows a further illustration of the area of the passage opening 5 with a second embodiment of valve seat 6, seal 7 and valve body 8.
  • Die Seal 7 made of elastomeric material is in the valve body in this embodiment integrated.
  • the metallic valve seat 6 is raised in the sealing area.
  • valve body 8 shows a further illustration of the area of the passage opening 5 with a third embodiment of valve seat 6 and valve body 8.
  • the seal 7 from elastomeric material is designed as an O-ring and integrated in the valve seat.
  • valve body 8 is designed as a plate.
  • the valve body 8 is on its side facing away from the valve seat 6 with a Form pressure compensation membrane 19, the fluctuations in the inlet pressure compensated.
  • the moving coil receives a power connection 20 control signals from a control unit, not shown, for. B. a boiler control.
  • the output signals of a sensor the recorded the state of the combustion as an input variable.
  • valve spindle 9 there is between the valve spindle 9 and the plunger 11 a control membrane 21.
  • the control diaphragm delimits with its facing away from the moving coil 11 Side in the housing 2, a space 22, with the pressure in the outlet is acted upon.
  • the closing spring is located in the room 22 and is supported on the one hand on the plate 18 of the control membrane 21 and on the other hand on the housing.
  • the moving coil 11 is supplied with a current via the current connection 20, which is proportional to the setpoint pressure in the outlet.
  • the moving coil 11 thus works as a setpoint generator for the control membrane 21.
  • the bracket 16 is connected by means of screws 24 to a spring element 23.
  • a top view of the spring element 23 is shown enlarged in FIG. 4.
  • the spring element 23 centers the bracket 16 in the housing 2 and ensures that the plunger 11 works in every installation position without contact.
  • the device 1 is a closing valve 25 upstream because two in the gas line due to safety regulations Closing valves must be arranged one behind the other.
  • the magnetic device can be designed differently become. It is Z. B. possible instead of an annular permanent magnet 13th to use a cylindrical magnet.
  • the guide elements 14, 15 are in to adapt accordingly to this case.
  • an electromagnet instead of a permanent magnet an electromagnet can be used.
  • the closing spring 17 instead of a plate 18 support directly on the valve body 8.
  • the holder 16 it is also possible for the holder 16 to be attached to the valve spindle 9 facing end is spindle-shaped and that the valve spindle 9 has a pot-shaped end piece in its end, in which the spindle-shaped end the bracket 16 is guided.
  • the valve stem it is also possible to use the valve stem and to firmly connect the bracket or the moving coil.

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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)

Abstract

The device has a housing with a through opening, at least one valve seat, at least one valve body joined to a valve spindle and a control drive that acts on the spindle depending on the deviation of a control parameter from a desired value. The control drive has a plunger coil acting on the spindle that moves axially without contact in an air gap in the magnetic field of a magnet. A closure spring on the valve body acts in the closing direction. The device has a housing (2) with an input (3), an output (4) and a through opening (5) with at least one valve seat (6), at least one valve body (8) associated with the valve seat and joined to a valve spindle (9) and a control drive (10) that acts on the spindle depending on the deviation of a control parameter from a desired value. The control drive has a plunger coil (11) acting on the spindle that moves axially without contact in an air gap (12) in the magnetic field of a magnet (13-15). A closure spring (17) on the valve body acts in the closing direction.

Description

Die Erfindung betrifft eine Vorrichtung zum Regeln des Gasstromes in einer Gasleitung zu einem Brenner nach dem Oberbegriff des Anspruches 1.The invention relates to a device for regulating the gas flow in a gas line to a burner according to the preamble of claim 1.

Aus der Praxis sind derartige Regelvorrichtungen bekannt, die als Stellantrieb einen Schrittmotor aufweisen, der Stellsignale von einem Regeleinheit, insbesondere zur Regelung des Gas-Verbrennungsluftverhältnisses erhält. Bei einem Stromausfall verharrt der Schrittmotor in seiner jeweiligen Position, so dass Gas durch die Durchtrittsöffnung strömen kann.Such control devices are known in practice, which act as actuators have a stepper motor, the control signals from a control unit, in particular to regulate the gas-combustion air ratio. At a Power failure, the stepper motor remains in its respective position, causing gas can flow through the passage opening.

Weiterhin sind Regelvorrichtungen bekannt, die einen Stellantrieb mit einer Regelmembran aufweisen. Die Regelmembran vergleicht den Druck im Ausgang der Vorrichtung mit einem Sollwert und erzeugt in Abhängigkeit von dem Vergleich ein Stellsignal. Auch mit einer derartigen Regelvorrichtung ist ausschließlich die Regelung der Gaszufuhr, aber nicht das Schließen der Gaszufuhr zu einem Brenner möglich.Furthermore, control devices are known which have an actuator with a control membrane exhibit. The control membrane compares the pressure in the outlet of the Device with a setpoint and generates depending on the comparison Actuating signal. Even with such a control device is only the control the gas supply, but not closing the gas supply to a burner possible.

In jedem Fall muss daher in der Gasleitung zusätzlich zu der Regelvorrichtung ein Schließventil gesehen werden. Eine Kombination aus Schließventil und Regelvorrichtung ist jedoch gerätetechnisch relativ aufwendig und somit kostenintensiv.In any case, therefore, in addition to the control device in the gas line Closing valve can be seen. A combination of closing valve and control device However, it is relatively complex in terms of device technology and therefore expensive.

Demgemäss liegt der Erfindung die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art so zu verbessern, dass zusätzlich zu der Regelfunktion die Möglichkeit besteht, den Gasstrom abzusperren.Accordingly, the invention has for its object a device of the beginning to improve the type mentioned so that in addition to the control function It is possible to shut off the gas flow.

Diese Aufgabe wird durch eine Vorrichtung mit den Merkmalen des Anspruches 1 gelöst.This object is achieved by a device with the features of claim 1 solved.

Wird die Stromzufuhr zur Tauchspule unterbrochen, wird diese kraftlos und die Schließfeder drückt den Ventilkörper auf den Ventilsitz. Der Ventilkörper oder der Ventilsitz sind derart ausgebildet, dass die Durchtrittsöffnung abdichtbar ist, d. h. wenn sich der Ventilkörper in der geschlossenen Stellung befindet, muss die Durchtrittsöffnung dicht sein. Damit ist gemeint, dass die Anforderungen der einschlägigen DIN-Normen an die Dichtheit von Sicherheitsabsperrventile erfüllt sein müssen. If the power supply to the moving coil is interrupted, it becomes powerless and the Closing spring presses the valve body onto the valve seat. The valve body or the Valve seat are designed such that the passage opening can be sealed, i. H. when the valve body is in the closed position, the The passage opening should be tight. This means that the requirements of the relevant DIN standards for the tightness of safety shut-off valves must be met have to.

Die Vorrichtung ist einfach aufgebaut und arbeitet gleichzeitig als Regelvorrichtung und als Absperrventil und ersetzt somit zwei Bauteile, nämlich ein separates Regelventil und ein Absperrventil. Auf diese Weise können erhebliche Kosten eingespart werden.The device is simply constructed and at the same time works as a control device and as a shut-off valve and thus replaces two components, namely a separate one Control valve and a shut-off valve. In this way, considerable costs can be saved become.

Das homogene Magnetfeld aus Tauchspule und Magneteinrichtung zentriert die Tauchspule geometrisch genau im Luftspalt der Magneteinrichtung. Das hat den Vorteil, dass die Tauchspule praktisch reibungsfrei axial bewegbar ist. Die Tauchspule schwebt praktisch berührungsfrei in dem ringförmigen Luftspalt der Magneteinrichtung. Der Stellantrieb arbeitet somit ohne nennenswerte Hysterese, was eine wesentliche Voraussetzung für elektrische Regelkreise ist.The homogeneous magnetic field from the moving coil and magnetic device centers the Moving coil geometrically precisely in the air gap of the magnetic device. That has the Advantage that the moving coil can be moved axially with practically no friction. The moving coil hovers practically contact-free in the annular air gap of the magnetic device. The actuator thus works without any noteworthy hysteresis, what is an essential requirement for electrical control loops.

Vorzugsweise erhält die Tauchspule Stellsignale von einem Regel/Steuergerät, der als Eingangsgrößen die Ausgangssignale eines Sensors erhält, wobei der Sensor dem Brenner zugeordnet ist und den Zustand der Verbrennung erfasst.Preferably, the moving coil receives control signals from a regulating / control device, which receives the output signals of a sensor as input variables, the Sensor is assigned to the burner and detects the state of combustion.

Eine wesentliche Weiterbildung der Vorrichtung nach der Erfindung besteht darin, dass sich zwischen der Ventilspindel und der Tauchspule eine Regelmembran befindet, die auf der der Tauchspule entgegengesetzten Seite von dem Druck im Ausgang beaufschlagt ist, wobei die Tauchspule mit einem Strom beaufschlagt wird, der dem Sollwert des Druckes im Ausgang proportional ist. Bei dieser Ausführungsform dient also die Tauchspule als Sollwertgeber für die Regelmembran.An essential development of the device according to the invention consists in that there is a control membrane between the valve stem and the moving coil located on the opposite side of the plunger from the pressure in the Output is applied, the plunger being supplied with a current which is proportional to the setpoint pressure in the outlet. In this embodiment the plunger therefore serves as a setpoint generator for the control membrane.

Vorteilhafterweise weist die Magneteinrichtung einen Magneten auf, dessen Magnetfeldlinien mittels Leitelementen aus magnetisch leitfähigem Material in den Luftspalt geleitet werden. Die Leitelemente dienen in bekannter Art und Weise zur Bündelung der Magnetfeldlinien im Luftspalt, so dass im Luftspalt ein homogenes Magnetfeld entsteht .The magnet device advantageously has a magnet whose magnetic field lines by means of guide elements made of magnetically conductive material in the Air gap are passed. The guide elements are used in a known manner Bundling of the magnetic field lines in the air gap so that a homogeneous one in the air gap Magnetic field arises.

Nach einem weiteren Merkmal der Erfindung weist die Magneteinrichtung einen ringförmigen Permanentmagneten auf, an den sich stirnseitig plattenförmige Leitelemente anschließen und welcher konzentrisch unter Bildung eines Luftspaltes ein zylinderförmiges Leitelement umgibt.According to a further feature of the invention, the magnet device has a ring-shaped permanent magnets, on the front plate-shaped guide elements connect and which concentric to form an air gap surrounds a cylindrical guide element.

Die Vorrichtung ist ferner dadurch gekennzeichnet, dass die Tauchspule mit einer Halterung verbunden ist, die an der Ventilspindel angreift. Es besteht keine feste Verbindung zwischen Halterung und Ventilspindel. Das hat den Vorteil, dass die Zentrierung der Tauchspule im Ringspalt durch das Magnetfeld durch die Ventilspindel nicht negativ beeinflusst wird. Wenn sich die Tauchspule bei einem Regelvorgang in Achsrichtung bewegt, greift die Halterung an der Ventilspindel an und verschiebt diese.The device is further characterized in that the moving coil with a Bracket is connected, which engages the valve stem. There is no fixed one Connection between bracket and valve stem. This has the advantage that the Centering of the moving coil in the annular gap by the magnetic field through the valve spindle is not adversely affected. If the moving coil is in a control process Moved in the axial direction, the bracket engages the valve spindle and postpones this.

Eine vorteilhafte Ausgestaltung der Erfindung besteht darin, dass die Halterung an ihrem der Ventilspindel zugewandten Ende ein topfförmiges Endstück aufweist, in der die Ventilspindel geführt wird.An advantageous embodiment of the invention is that the holder on has a cup-shaped end piece at its end facing the valve spindle, in which guides the valve stem.

Alternativ ist es auch möglich, dass die Halterung an ihrem der Ventilspindel zugewandtem Ende spindelförmig ausgebildet ist und dass die Ventilspindel an ihrem Ende ein topfförmiges Endstück aufweist, in dem das spindelförmige Ende der Halterung geführt wird.Alternatively, it is also possible for the holder on its side facing the valve spindle End is spindle-shaped and that the valve spindle has a pot-shaped end piece in its end, in which the spindle-shaped end the bracket is guided.

Wenn die Vorrichtung in einer Lage eingebaut werden muss, bei denen die Tauchspule nicht vertikal angeordnet ist, besteht die vorteilhafte Möglichkeit, die Halterung mit mindestens einem Federelement im Gehäuse zu zentrieren.If the device must be installed in a position where the Plunger is not arranged vertically, there is the advantageous possibility that Center bracket with at least one spring element in the housing.

Vorzugsweise stützt sich die Schließfeder einerseits an einem mit der Ventilspindel verbundenen Teller und andererseits am Gehäuse ab.The closing spring is preferably supported on the one hand by the valve spindle connected plate and on the other hand on the housing.

Vorteilhafterweise ist der Ventilsitz eingangsdruckseitig angeordnet. Der Ventilsitz oder der Ventilkörper weist eine Dichtung aus elastomerem Material, vorzugsweise Gummi, auf. Ventilkörper und Ventilsitz sind vorzugsweise gelenkig miteinander verbunden. Diese Gestaltung ermöglicht, dass in der Schließstellung die Durchtrittsöffnung dicht verschlossen wird.The valve seat is advantageously arranged on the inlet pressure side. The valve seat or the valve body has a seal made of elastomeric material, preferably Rubber, on. The valve body and valve seat are preferably articulated with one another connected. This design enables that in the closed position The passage opening is tightly closed.

Nach einem weiteren vorteilhaften Merkmal der Erfindung ist der Ventilkörper an seiner dem Ventilsitz zugewandten Seite mit einer Vordruck-Ausgleichsmembran verbunden.According to a further advantageous feature of the invention, the valve body is on its side facing the valve seat with a pre-pressure compensation membrane connected.

Im Regelfall ist es aus Sicherheitsgründen erforderlich, dass in einer Gasleitung zwei Schließventile hintereinander angeordnet sind. Daher ist in Weiterbildung der Erfindung die Vorrichtung gekennzeichnet durch die Kombination mit einem Schließventil. Dieses kann der Vorrichtung vor- oder nachgeschaltet werden. As a rule, it is necessary for safety reasons that in a gas line two closing valves are arranged one behind the other. Therefore, in continuing education Invention characterized by the combination with a device Closing valve. This can be connected upstream or downstream of the device.

Die Erfindung wird im Folgenden anhand bevorzugter Ausführungsbeispiele der erfindungsgemäßen Vorrichtung im Zusammenhang mit der Zeichnung näher erläutert.The invention is described below with the aid of preferred exemplary embodiments of the Device according to the invention in connection with the drawing explained.

Die Zeichnung zeigt in:

Fig. 1
einen Schnitt durch eine erste Ausführungsform;
Fig. 2
einen Schnitt durch eine zweite Ausführungsform;
Fig. 3
einen Schnitt durch eine dritte Ausführungsform;
Fig. 4
eine Sicht auf ein Federelement 23 aus Fig.3;
Fig. 5
eine vergrößerte Darstellung des Bereichs der Durchtrittsöffnung mit Ventilsitz 6, Dichtung 7 und Ventilkörper 8;
Fig. 6
eine weitere Darstellung des Bereichs der Durchtrittsöffung mit einer zweiten Ausführungsform von Ventilsitz 6, Dichtung 7 und Ventilkörper 8;
Fig. 7
eine weitere Darstellung des Bereichs der Durchtrittsöffung 5 mit einer dritten Ausführungsform von Ventilsitz 6, Dichtung 7 und Ventilkörper 8.
The drawing shows in:
Fig. 1
a section through a first embodiment;
Fig. 2
a section through a second embodiment;
Fig. 3
a section through a third embodiment;
Fig. 4
a view of a spring element 23 from Figure 3;
Fig. 5
an enlarged view of the area of the passage opening with valve seat 6, seal 7 and valve body 8;
Fig. 6
a further representation of the area of the passage opening with a second embodiment of valve seat 6, seal 7 and valve body 8;
Fig. 7
a further representation of the area of the passage opening 5 with a third embodiment of the valve seat 6, seal 7 and valve body 8.

Die Zeichnung nach Fig. 1 bis Fig. 3 zeigt eine Vorrichtung 1, die in einer nicht dargestellten Gasleitung eingebaut ist, die zu einem ebenfalls nicht dargestellten Brenner führt. Der Brenner beheizt beispielsweise einen Heizkessel.The drawing of Fig. 1 to Fig. 3 shows a device 1, which is not in a Gas line shown is installed, which also leads to a not shown Brenner leads. The burner heats a boiler, for example.

Die Vorrichtung 1 weist ein Gehäuse 2 mit einem Eingang 3, einem Ausgang 4 und einer zwischen Eingang 3 und Ausgang 4 angeordneten Durchtrittsöffnung 5 auf. Die Durchtrittsöffnung 5 ist mit einem Ventilsitz 6 versehen. Dieser weist eine Dichtlippe 7 aus elastomerem gasbeständigem Material, vorzugsweise Gummi auf. The device 1 has a housing 2 with an input 3, an output 4 and a passage opening 5 arranged between entrance 3 and exit 4 on. The passage opening 5 is provided with a valve seat 6. This one Sealing lip 7 made of elastomeric gas-resistant material, preferably rubber on.

Dem Ventilsitz 6 ist ein metallischer Ventilkörper 8 zugeordnet. Der Ventilkörper 8 ist mit einer Ventilspindel 9 verbunden, auf die ein Stellantrieb 10 einwirkt. Der Stellantrieb 10 weist eine Tauchspule 11 auf, die in einem ringförmigen Luftspalt 12 berührungsfrei im Magnetfeld einer Magneteinrichtung schwebt. Die Magneteinrichtung besteht im Wesentlichen aus einem ringförmigen Permanentmagneten 13, der konzentrisch ein zylindrisches Leitelement 14a aus magnetisch leitfähigem Material, hier Eisen umgibt. Das Leitelement 14a geht stirnseitig in ein plattenförmiges Leitelement 14b über, das sich unterhalb des Permanentmagneten 13 befindet. Ein weiteres Leitelement 15 aus Eisen befindet sich oberhalb des Permanentmagneten 13. Die Leitelemente bündeln die Magnetfeldlinie derart, dass im Luftspalt 12 ein homogenes Magnetfeld wirksam ist.A metallic valve body 8 is assigned to the valve seat 6. The valve body 8 is connected to a valve spindle 9, on which an actuator 10 acts. The Actuator 10 has a plunger coil 11, which is in an annular air gap 12 hovers without contact in the magnetic field of a magnetic device. The magnetic device consists essentially of an annular permanent magnet 13, which is concentrically a cylindrical guide element 14a made of magnetically conductive Material, here iron surrounds. The end of the guide element 14a is plate-shaped Guide element 14b, which is located below the permanent magnet 13 located. Another guiding element 15 made of iron is located above the permanent magnet 13. The guide elements bundle the magnetic field line in such a way that Air gap 12 a homogeneous magnetic field is effective.

Das Magnetfeld der Tauchspule11 sowie der Magneteinrichtung 13, 14, 15 zentriert die Tauchspule 11 geometrisch genau im ringförmigen Luftspalt 12, so dass die Axialbewegung der Tauchspule 11 beim Regeln berührungsfrei ist. Der Stellantrieb 10 arbeitet somit ohne nennenswerte Hysterese.The magnetic field of the moving coil 11 and the magnetic device 13, 14, 15 centers the moving coil 11 geometrically precisely in the annular air gap 12, see above that the axial movement of the moving coil 11 is non-contact during control. The Actuator 10 thus operates without any significant hysteresis.

Die Tauchspule 11 ist konzentrisch auf einer hohlzylinderförmigen Halterung 16 angeordnet. Die Halterung 16 ist an demjenigen Ende, das der Ventilspindel zugewandt ist, topfförmig ausgebildet. In dem topfförmige Ende 16a wird die Ventilspindel 9 geführt.The moving coil 11 is concentric on a hollow cylindrical holder 16 arranged. The bracket 16 is at the end facing the valve stem is cup-shaped. In the cup-shaped end 16a, the valve spindle 9 led.

Da Ventilspindel 9 und der Tauchspule 11 lediglich kraftschlüssig, aber nicht fest miteinander verbunden sind, wird die Zentrierung der Tauchspule 11 von der Ventilspindel 9 nicht negativ beeinflusst.Since the valve spindle 9 and the moving coil 11 are only non-positive, but not fixed are connected to each other, the centering of the moving coil 11 by the valve spindle 9 not negatively affected.

Eine Schließfeder 17 stützt sich einerseits an einem Teller 18, der mit der Ventilspindel 9 fest verbunden ist und andererseits am Gehäuse 2 ab. Wenn die Tauchspule 11 kraftlos wird, weil die Stromzufuhr zur Tauchspule unterbrochen wird, drückt die Schließfeder 17 den Ventilkörper 8 auf den Ventilsitz 6.A closing spring 17 is supported on the one hand on a plate 18 with the valve spindle 9 is firmly connected and on the other hand on the housing 2. If the moving coil 11 becomes weak because the power supply to the moving coil is interrupted, the closing spring 17 presses the valve body 8 onto the valve seat 6.

Der Bereich der Durchtrittsöffnung 5 ist in Fig. 5 vergrößert dargestellt. Der Ventilkörper 8 befindet sich in einer Regelposition mit geöffneter Durchtrittsöffnung. Der Ventilsitz 6 aus Metall weist eine Dichtung 7 aus elastomerem Material in Form einer Dichtlippe aus Gummi auf, die mit dem metallische Ventilkörper 8 abdichtend zusammenwirkt. In der Schließstellung des Ventilkörpers 8 wird die Durchtrittsöffnung 5 abgedichtet und der Gasstrom abgesperrt. Der Ventilkörper 8 ist mit der Ventilspindel 9 mit Hilfe eines nicht dargestellten gasdichten Gelenkes beweglich verbunden, so dass der Ventilkörper Kippbewegungen machen kann, um Toleranzen im Dichtungsbereich auszugleichen.The area of the passage opening 5 is shown enlarged in FIG. 5. The valve body 8 is in a control position with the passage opening open. The Valve seat 6 made of metal has a seal 7 made of elastomeric material in the form a sealing lip made of rubber, which seals with the metallic valve body 8 interacts. In the closed position of the valve body 8, the passage opening 5 sealed and the gas flow shut off. The valve body 8 is with the Valve spindle 9 movable with the help of a gas-tight joint, not shown connected so that the valve body can make tilting movements Compensate tolerances in the sealing area.

Fig. 6 zeigt eine weitere Darstellung des Bereichs der Durchtrittsöffung 5 mit einer zweiten Ausführungsform von Ventilsitz 6, Dichtung 7 und Ventilkörper 8. Die Dichtung 7 aus elastomerem Material ist bei dieser Ausführungsform im Ventilkörper integriert. Der metallische Ventilsitz 6 ist im Dichtungsbereich erhöht ausgeführt. Alternativ ist es auch möglich, die Kontur des Ventilsitzes 6 im wesentlichen plan, angepasst an die Kontur des Ventilkörpers auszuführen.6 shows a further illustration of the area of the passage opening 5 with a second embodiment of valve seat 6, seal 7 and valve body 8. Die Seal 7 made of elastomeric material is in the valve body in this embodiment integrated. The metallic valve seat 6 is raised in the sealing area. Alternatively, it is also possible to essentially change the contour of the valve seat 6 to be carried out flat, adapted to the contour of the valve body.

Fig. 7 zeigt eine weitere Darstellung des Bereichs der Durchtrittsöffung 5 mit einer dritten Ausführungsform von Ventilsitz 6 und Ventilkörper 8. Die Dichtung 7 aus elastomerem Material ist als O-Ring ausgeführt und im Ventilsitz integriert. Der Ventilkörper 8 ist bei dieser Ausführungsform als Teller ausgebildet.7 shows a further illustration of the area of the passage opening 5 with a third embodiment of valve seat 6 and valve body 8. The seal 7 from elastomeric material is designed as an O-ring and integrated in the valve seat. The In this embodiment, valve body 8 is designed as a plate.

Der Ventilkörper 8 ist auf seiner dem Ventilsitz 6 abgewandten Seite mit einer Vordruck-Ausgleichsmembran 19 versehen, die Schwankungen des Eingangsdruckes kompensiert.The valve body 8 is on its side facing away from the valve seat 6 with a Form pressure compensation membrane 19, the fluctuations in the inlet pressure compensated.

Bei der Ausführungsform nach Fig. 1 erhält die Tauchspule über einen Stromanschluss 20 Stellsignale von einem nicht dargestellten Regel/Steuergerät, z. B. einer Kesselsteuerung. In diese gehen die Ausgangssignale eines Sensors, der den Zustand der Verbrennung erfasst, als Eingangsgröße ein.In the embodiment according to FIG. 1, the moving coil receives a power connection 20 control signals from a control unit, not shown, for. B. a boiler control. The output signals of a sensor, the recorded the state of the combustion as an input variable.

Bei der Ausführungsform nach Fig. 2 befindet sich zwischen der Ventilspindel 9 und der Tauchspule 11 eine Regelmembran 21. Der Teller 18, an dem sich die Schließfeder abstützt, dient gleichzeitig zur Befestigung der Regelmembran 21 an der Ventilspindel 9. Die Regelmembran begrenzt mit ihrer der Tauchspule 11 abgewandten Seite im Gehäuse 2 einen Raum 22, der mit dem Druck im Ausgang beaufschlagt ist. Die Schließfeder befindet sich in dem Raum 22 und stützt sich einerseits am Teller 18 der Regelmembran 21 und anderseits am Gehäuse ab. Die Tauchspule 11 wird über den Stromanschluss 20 mit einem Strom beaufschlagt, der dem Sollwert des Druckes im Ausgang proportional ist. Die Tauchspule 11 arbeitet somit als Sollwertgeber für die Regelmembran 21. In the embodiment according to FIG. 2 there is between the valve spindle 9 and the plunger 11 a control membrane 21. The plate 18 on which the Supporting the spring is used to attach the control membrane 21 the valve spindle 9. The control diaphragm delimits with its facing away from the moving coil 11 Side in the housing 2, a space 22, with the pressure in the outlet is acted upon. The closing spring is located in the room 22 and is supported on the one hand on the plate 18 of the control membrane 21 and on the other hand on the housing. The moving coil 11 is supplied with a current via the current connection 20, which is proportional to the setpoint pressure in the outlet. The moving coil 11 thus works as a setpoint generator for the control membrane 21.

Die Halterung 16 ist mittels Schrauben 24 mit einem Federelement 23 verbunden. Eine Draufsicht des Federelements 23 ist in Fig. 4 vergrößert dargestellt. Das Federelement 23 zentriert die Halterung 16 im Gehäuse 2 und gewährleistet, dass die Tauchspule 11 in jeder Einbaulage berührungsfrei arbeitet.The bracket 16 is connected by means of screws 24 to a spring element 23. A top view of the spring element 23 is shown enlarged in FIG. 4. The spring element 23 centers the bracket 16 in the housing 2 and ensures that the plunger 11 works in every installation position without contact.

Bei der Ausführungsform nach Fig. 3 ist der Vorrichtung 1 ein Schließventil 25 vorgeschaltet, weil in der Gasleitung aufgrund von Sicherheitsbestimmungen zwei Schließventile hintereinander angeordnet werden müssen.In the embodiment according to FIG. 3, the device 1 is a closing valve 25 upstream because two in the gas line due to safety regulations Closing valves must be arranged one behind the other.

Im Rahmen der Erfindung sind ohne Weiteres Abwandlungsmöglichkeiten gegeben. So kann beispielsweise die Magneteinrichtung konstruktiv anders ausgeführt werden. Es ist z. B. möglich, statt eines ringförmigen Permanentmagneten 13 einen zylinderförmigen Magneten zu verwenden. Die Leitelemente 14, 15 sind in diesem Fall entsprechend anzupassen. Ferner kann statt eines Permanentmagneten ein Elektromagnet eingesetzt werden. Schließlich kann sich die Schließfeder 17 statt an einem Teller 18 direkt am Ventilkörper 8 abstützen.Within the scope of the invention, modification possibilities are readily available. For example, the magnetic device can be designed differently become. It is Z. B. possible instead of an annular permanent magnet 13th to use a cylindrical magnet. The guide elements 14, 15 are in to adapt accordingly to this case. Furthermore, instead of a permanent magnet an electromagnet can be used. Finally, the closing spring 17 Instead of a plate 18 support directly on the valve body 8.

Alternativ ist es auch möglich, dass die Halterung 16 an ihrem der Ventilspindel 9 zugewandtem Ende spindelförmig ausgebildet ist und dass die Ventilspindel 9 an ihrem Ende ein topfförmiges Endstück aufweist, in dem das spindelförmige Ende der Halterung 16 geführt wird. Es ist allerdings auch möglich, die Ventilspindel und die Halterung oder die Tauchspule fest miteinander zu verbinden.Alternatively, it is also possible for the holder 16 to be attached to the valve spindle 9 facing end is spindle-shaped and that the valve spindle 9 has a pot-shaped end piece in its end, in which the spindle-shaped end the bracket 16 is guided. However, it is also possible to use the valve stem and to firmly connect the bracket or the moving coil.

Claims (14)

Vorrichtung zum Regeln eines Gasstromes in einer Gasleitung zu einem Brenner,
mit einem Gehäuse (2) das einen Eingang (3), einen Ausgang (4) und eine Durchtrittsöffnung (5) aufweist, welche mit mindestens einem Ventilsitz (6) versehen ist,
mit mindestens einem Ventilkörper (8), der dem Ventilsitz (6) zugeordnet ist und der mit einer Ventilspindel (9) verbunden ist und
mit einem Stellantrieb (10), der in Abhängigkeit von der Abweichung einer Regelgröße von einem Sollwert auf die Ventilspindel (9) einwirkt,
dadurch gekennzeichnet, dass der Stellantrieb (10) eine Tauchspule (11) aufweist, die auf die Ventilspindel (9) einwirkt, wobei die Tauchspule (11) in einem Luftspalt (12) im Magnetfeld einer Magneteinrichtung (13, 14, 15) berührungsfrei axial bewegbar ist,
dass auf den Ventilkörper (8) eine Schließfeder (17) in Schließrichtung einwirkt und dass der Ventilsitz (6) oder der Ventilkörper (8) derart ausgebildet ist, dass die Durchtrittsöffnung (5) abdichtbar ist.Device for regulating a gas flow in a gas line to a burner,
with a housing (2) which has an inlet (3), an outlet (4) and a passage opening (5) which is provided with at least one valve seat (6),
with at least one valve body (8) which is assigned to the valve seat (6) and which is connected to a valve spindle (9) and
with an actuator (10) which acts on the valve spindle (9) as a function of the deviation of a controlled variable from a target value,
characterized in that the actuator (10) has a plunger coil (11) which acts on the valve spindle (9), the plunger coil (11) in an air gap (12) in the magnetic field of a magnetic device (13, 14, 15) axially without contact is movable
that a closing spring (17) acts on the valve body (8) in the closing direction and that the valve seat (6) or the valve body (8) is designed such that the passage opening (5) can be sealed. Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet, dass die Tauchspule (11) Stellsignale von einem Regel/Steuergerät erhält, dem die Ausgangssignale eines Sensors, der den Zustand der Verbrennung erfasst, als Eingangssignale zugeführt werden.Device according to claim 1,
characterized in that the moving coil (11) receives control signals from a regulating / control device, to which the output signals of a sensor, which detects the state of the combustion, are supplied as input signals. Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet, dass sich zwischen der Ventilspindel (9) und der Tauchspule (11) eine Regelmembran (21) befindet, die auf der der Tauchspule (11) abgewandten Seite vom Druck im Ausgang beaufschlagt wird, wobei die Tauchspule (11) mit einem Strom beaufschlagt wird, der dem Sollwert des Druckes im Ausgang proportional ist.Device according to claim 1,
characterized in that between the valve spindle (9) and the plunger (11) there is a control membrane (21) which is acted upon by the pressure in the outlet on the side facing away from the plunger (11), the plunger (11) being supplied with a current is applied, which is proportional to the setpoint of the pressure in the outlet. Vorrichtung nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass die Magneteinrichtung einen Magneten (13) aufweist, dessen Magnetfeldlinien mittels Leitelementen (14b,15) aus magnetisch leitfähigem Material in den Luftspalt (12) geleitet werden.Device according to one of claims 1 to 3,
characterized in that the magnetic device has a magnet (13), the magnetic field lines of which are guided into the air gap (12) by means of guide elements (14b, 15) made of magnetically conductive material. Vorrichtung nach Anspruch 4,
dadurch gekennzeichnet, dass der Magnet (13) als ringförmiger Permanentmagnet ausgebildet ist, der konzentrisch unter Bildung des Luftspaltes (12) ein zylindrisches Leitelement (14a) umgibt, wobei sich an den Magneten (13) stirnseitig plattenförmig ausgebildete Leitelemente (14a, 15) anschließen.Device according to claim 4,
characterized in that the magnet (13) is designed as an annular permanent magnet which concentrically surrounds a cylindrical guide element (14a) to form the air gap (12), with plate-shaped guide elements (14a, 15) connecting to the magnets (13) on the end face , Vorrichtung nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet, dass die Tauchspule mit einer Halterung (16) verbunden ist, die an der Ventilspindel (9) angreift.Device according to one of claims 1 to 5,
characterized in that the moving coil is connected to a holder (16) which engages the valve spindle (9). Vorrichtung nach Anspruch 6,
dadurch gekennzeichnet, dass die Halterung (16) an ihrem der Ventilspindel (9) zugewandten Ende ein topfförmiges Endstück (16 a) aufweist, in dem die Ventilspindel (9) geführt wird.Device according to claim 6,
characterized in that the holder (16) has at its end facing the valve spindle (9) a cup-shaped end piece (16 a) in which the valve spindle (9) is guided. Vorrichtung nach Anspruch 6,
dadurch gekennzeichnet, dass die Halterung (16) an ihrem der Ventilspindel zugewandtem Ende spindelförmig ausgebildet ist und dass die Ventilspindel (9) an ihrem Ende ein topfförmiges Endstück aufweist, in dem das spindelförmige Ende der Halterung (16) geführt wird.Apparatus according to claim 6,
characterized in that the holder (16) is spindle-shaped at its end facing the valve spindle and in that the valve spindle (9) has a cup-shaped end piece at its end, in which the spindle-shaped end of the holder (16) is guided. Vorrichtung nach einem der Ansprüche 6 bis 8 ,
dadurch gekennzeichnet, dass die Halterung (16) mit mindestens einem Federelement (23) im Gehäuse (2) zentriert ist.Device according to one of claims 6 to 8,
characterized in that the holder (16) is centered in the housing (2) with at least one spring element (23). Vorrichtung nach einem der Ansprüche 1 bis 9,
dadurch gekennzeichnet, dass sich die Schließfeder (17) einerseits an einem mit der Ventilspindel (9) verbunden Teller (18) und andererseits am Gehäuse (2) abstützt.Device according to one of claims 1 to 9,
characterized in that the closing spring (17) is supported on the one hand on a plate (18) connected to the valve spindle (9) and on the other hand on the housing (2). Vorrichtung nach einem der Ansprüche 1 bis 10,
dadurch gekennzeichnet, dass der Ventilsitz (6) eingangsseitig angeordnet ist und dass der Ventilsitz (6) oder der Ventilkörper (8) eine Dichtung (7) aus elastomerem Material, vorzugsweise Gummi, aufweist.Device according to one of claims 1 to 10,
characterized in that the valve seat (6) is arranged on the input side and that the valve seat (6) or the valve body (8) has a seal (7) made of elastomeric material, preferably rubber. Vorrichtung nach einem der Ansprüche 1 bis 11,
dadurch gekennzeichnet, dass der Ventilkörper (8) mit der Ventilspindel (9) gelenkig verbunden ist.Device according to one of claims 1 to 11,
characterized in that the valve body (8) is articulated to the valve spindle (9). Vorrichtung nach einem der Ansprüche 1 bis 12,
dadurch gekennzeichnet, dass der Ventilkörper (8) auf seiner dem Ventilsitz (6) abgewandten Seite mit einer Vordruck-Ausgleichsmembran (19) verbunden ist.Device according to one of claims 1 to 12,
characterized in that the valve body (8) is connected on its side facing away from the valve seat (6) to a pre-pressure compensation membrane (19). Vorrichtung nach einem der Ansprüche 1 bis 13,
gekennzeichnet durch eine Kombination mit einem Schließventil (25).Device according to one of claims 1 to 13,
characterized by a combination with a closing valve (25).
EP03011571A 2002-07-12 2003-05-22 Device for regulating the gas flow to a burner Withdrawn EP1382907A1 (en)

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