EP0725889A1 - Controlling motor, in particular for quick-action stop valves - Google Patents

Controlling motor, in particular for quick-action stop valves

Info

Publication number
EP0725889A1
EP0725889A1 EP94929481A EP94929481A EP0725889A1 EP 0725889 A1 EP0725889 A1 EP 0725889A1 EP 94929481 A EP94929481 A EP 94929481A EP 94929481 A EP94929481 A EP 94929481A EP 0725889 A1 EP0725889 A1 EP 0725889A1
Authority
EP
European Patent Office
Prior art keywords
area
pressure
actuator
hydraulic fluid
cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94929481A
Other languages
German (de)
French (fr)
Other versions
EP0725889B1 (en
Inventor
Dieter Muerbe
Matthias Hartmann
Hans-Frieder Schneider
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of EP0725889A1 publication Critical patent/EP0725889A1/en
Application granted granted Critical
Publication of EP0725889B1 publication Critical patent/EP0725889B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
    • F01D21/16—Trip gear
    • F01D21/18—Trip gear involving hydraulic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
    • F15B2011/0243—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits the regenerative circuit being activated or deactivated automatically
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S91/00—Motors: expansible chamber type
    • Y10S91/03—Large area valve

Definitions

  • the invention relates to a servomotor for displacing a rod along an axis, with a hydraulic actuator with a cylinder in which a piston which is non-positively connected to the rod is mounted in a sliding and sealing manner, a compression spring which is non-positively connected to the rod and counteracts the actuator, and a trigger with an inflow area which can be acted upon by a hydraulic fluid, a pressure area connected to the inflow area by a diaphragm to which the actuator is connected, a discharge area from which hydraulic fluid can be discharged without pressure and a switching element which connects the pressure area with the Drain area connects when a positive pressure drop from the pressure area to the inflow area occurs and otherwise blocks the drain area.
  • the invention relates in particular to a servomotor for a quick-closing valve, as is used, for example, on a steam turbine, for which a possibility for rapid shutdown is required.
  • a servomotor for a quick-closing valve as is used, for example, on a steam turbine, for which a possibility for rapid shutdown is required.
  • This is the case on practically every steam turbine which drives a generator for generating electrical current, both in a power plant and in an industrial plant.
  • a steam turbine, which operates a compressor or the like in a chemical plant, must usually also be provided with such a quick-closing valve along with the associated servomotor.
  • An outer pipe socket which surrounds the already mentioned pipe socket, delimits the annular drainage area through which hydraulic fluid can flow out when the plate is raised from the pressure area by hydraulic fluid, which occurs when the pressure of the hydraulic fluid in the inflow area is reduced and a positive pressure drop occurs from the pressure area to the inflow area.
  • the servomotor according to DD 263 801 AI is characterized in that it can be operated from a single feed system for the hydraulic fluid. If the quick-closing valve to which the servomotor is connected is to be opened, it is sufficient to supply hydraulic fluid to the inflow area and thus to build up a pressure in the inflow area. This pressure presses the plate onto the pipe socket and prevents the hydraulic fluid from running off into the discharge area; through the orifice in the plate, the hydraulic fluid reaches the pressure area and there ensures a gradual pressure build-up, whereby the piston, which is pressed into a starting position by a corresponding pressure spring, is pushed into an end position and the quick-closing valve opens .
  • the servomotor is also set up to operate a so-called push-up valve, ie a valve with an annular valve seat and a matching valve cone, which is fastened to a spindle on a side facing the valve seat and which projects through the valve seat; on this spindle must be connected to the actuator so that the valve seat is between the valve plug and the actuator.
  • a so-called push-up valve ie a valve with an annular valve seat and a matching valve cone, which is fastened to a spindle on a side facing the valve seat and which projects through the valve seat; on this spindle must be connected to the actuator so that the valve seat is between the valve plug and the actuator.
  • the servomotor is unsuitable for operating a so-called pull-up valve, which likewise has an annular valve seat with a suitable valve cone on a spindle, although the spindle does not protrude through the valve seat, but on a side of the valve cone facing away from the valve seat this is connected; on
  • the servomotor must be connected to the spindle in such a way that the valve cone is located between the valve seat and the servomotor.
  • a winding valve makes it possible to keep the spindle away from fluid which flows through the opened valve; this is not possible in the case of an opening valve, since the spindle always protrudes through the valve seat through which the fluid flows.
  • An opening valve therefore generally offers an operational advantage over an opening valve.
  • the object of the invention is to provide another servomotor of the type mentioned, which is particularly suitable for connection to a so-called opening quick-closing valve.
  • a servomotor for moving a rod along an axis is specified with a hydraulic actuator with a cylinder in which a piston which is connected to the rod in a friction-locked manner is mounted in a sliding and sealing manner, one which is connected to the rod in a friction-locked manner and the Actuator counteracting compression spring and a trigger with an inflow area, which can be acted upon by a hydraulic fluid, a pressure area connected to the inflow area by a diaphragm, to which the actuator is connected, an outflow area from the hydraulic fluid can be discharged without pressure, and a switching element which connects the pressure area to the drain area when a positive pressure drop occurs from the pressure area to the inflow area, and otherwise shuts off the drain area, the rod being able to be pushed out of the cylinder by the compression spring and by acting on the Cylinder with the hydraulic fluid is pulled into the cylinder.
  • This servomotor in particular opens up the advantages offered by the servomotor which is based on the prior art and which is intended for an opening valve.
  • the servomotor according to the invention is relatively easy to operate, since it only requires a single delivery system for hydraulic fluid, and it enables use on an opening quick-closing valve, i.e. a quick-closing valve, in which a closing element is opened for opening via a valve spindle.
  • a quick-closing valve has the advantage that the valve spindle used to open the closing element during normal operation, i.e. while the quick-closing valve is filled with a fluid such as e.g.
  • the switching element in the servomotor is advantageously a plate which is arranged in the inflow region and which lies sealingly on two pipe sockets which delimit the pressure region and the outlet region.
  • This plate also advantageously contains the aperture in the form of a small hole; In this configuration, a particularly compact shape of the trigger is achieved.
  • the plate is preferably on with another compression spring pressed the pipe socket and thus allows to arrange the trigger in any spatial position.
  • the actuator is advantageous to structurally combine the actuator with the trigger, in particular in such a way that the trigger, as seen from the rod along the axis, is arranged behind the actuator.
  • the servomotor can be designed as a compact, largely cylindrical unit.
  • connection between the weight room and the pressure area is advantageously designed as a variable-length pipe connection.
  • a pipe connection is in particular formed with two sealingly plugged pipe sockets, one of the pipe sockets being connected to the stationary trigger and another pipe socket being connected to the movable piston.
  • the plate mentioned advantageously rests as a switching element on the pipe socket connected to the trigger.
  • the compression spring pressing the piston is preferably arranged in the discharge area; in this way it is wetted by the hydraulic fluid during operation and thus to a certain extent protected against corrosion, and this arrangement also benefits the compactness of the servomotor.
  • the piston delimits between itself and an end wall of the cylinder, through which the rod is guided, a force space which can be acted upon by the hydraulic fluid and has one in the
  • This embodiment which relates in particular to the piston, can of course be combined with further advantage with the embodiments of the servomotor already mentioned.
  • the embodiment just described makes it possible to brake the piston shortly before reaching the initial position when the servomotor is triggered; this is because when the projection of the piston dips into the recess in the end wall, two spaces communicating with one another only through the aforementioned gap are formed in the weight room, the hydraulic fluid having to drain out of one space, which is what depending on the size of this gap and the corresponding flow resistance, which the gap opposes to the hydraulic fluid, only in a significantly slower manner
  • the piston is braked shortly before it reaches its initial position, which makes a significant contribution to avoiding damage to the servomotor itself and to a valve or the like to which the servomotor is connected.
  • the effect described is achieved in particular when the piston has at least one bore through which the force space communicates with the pressure area of the trigger and which crosses the projection.
  • the outflow of hydraulic fluid from the power room takes place at least partially through the gap and provides the desired braking effect.
  • the servomotor of any configuration is particularly suitable for driving a valve, in particular a quick-closing valve.
  • the servomotor of any configuration is used in particular to bring about a quick close on a valve, in particular a quick close valve, in a steam power plant.
  • a servomotor with a trigger according to the invention is in no way limited to servomotors which are used exclusively to drive quick-closing valves. It is by no means excluded that a servomotor according to the invention can be further strengthened such that it is trained for a continuous and controlled displacement of the rod in addition to performing a quick close using the trigger.
  • Figure 1 shows an actuator for moving a rod 1 along an axis 2, the rod 1 protruding from an end wall 15 of a cylinder 3. Due to the force of a compression spring 17, which acts on a piston 14 movably mounted in the cylinder 3 and connected to the rod 1 and loaded with a compression spring 17, the axis 2 can be pushed out of the cylinder 3 and can pass through Actuation of the hydraulic actuator formed with the cylinder 3 and the piston 14 with hydraulic fluid, in particular hydraulic oil, be drawn into the cylinder 3. For this purpose, between the piston 14 and the end wall 15 a variable in size and defined by the piston 14 against other areas of the cylinder 3 force space 16 is provided. The force chamber 16 is acted upon by the hydraulic fluid via a trigger 4.
  • a compression spring 17 which acts on a piston 14 movably mounted in the cylinder 3 and connected to the rod 1 and loaded with a compression spring 17, the axis 2 can be pushed out of the cylinder 3 and can pass through Actuation of the hydraulic actuator formed with the cylinder 3 and the piston
  • the trigger 4 as seen from the rod 1 along the axis 2, is arranged behind the actuator 3, 14.
  • the trigger 4 has an inflow region 5 which can be acted upon by the hydraulic fluid from a delivery system 6.
  • a hydraulic pump 24 is shown which can pressurize the hydraulic fluid in the delivery system 6 and a control valve 25 through which the hydraulic fluid can optionally flow out of the delivery system 6 and thus the Pressure in the delivery system 6 reduced.
  • the control valve 25 is closed, so that a pressure can build up in the inflow region 5.
  • This pressure causes a switching element 10 of the trigger 4, namely a plate 10, to be pressed onto two pipe sockets 11 and 12 which are concentric with one another.
  • the inner pipe socket 12 forms the pressure area 7 in its interior, which communicates with the inflow area 5 through an orifice 8, namely a bore 8 in the plate 10.
  • a pressure also builds up in the pressure region 7.
  • Drain bores 26 serve this purpose, for which several possibilities are shown in FIG. 1.
  • Another compression spring 13 presses the plate 10 onto the pipe socket 11 and 12, thus ensuring that seals, which are not shown in detail, are generally effective between the two pipe socket 11 and 12 and the plate 10.
  • the further compression spring 13 can be designed such that the servomotor can be operated in any spatial position.
  • the compression spring 17 can in any case push the piston 14 back to the end wall 15 into the initial position and thereby convey the hydraulic fluid through the bores 18 and the pipe sockets 19 and 12 in the outlet area 9. This results in an abrupt movement of the piston 14 towards the end wall 15, and the rod 1 is likewise abruptly pushed out of the cylinder 3. In this way, a quick-closing valve or the like can be closed in the shortest possible time. This process is called "triggering" the trigger.

Abstract

A controlling motor for moving a stem (1) along an axis (2) has a hydraulic actuator (3, 14) with a cylinder (3) in which a piston (14) that is frictionally linked to the stem (1) is slidingly and sealingly mounted, as well as a compression spring (17) that is frictionally linked to the stem (1) and acts against the actuator (3, 14). The controlling motor has a trigger (4) with an inflow area (5) into which hydraulic fluid may be introduced, a pressure area (7) that communicates with the inflow area (5) through a diaphragm (8) and is connected to the actuator (3, 14), and a drainage area (9) from which the hydraulic fluid may be evacuated without pressure, as well as a switching element (10) that links the pressure area (7) to the drainage area (9) when a positive pressure differential occurs between the pressure area (7) and the inflow area (5), and that otherwise shuts off the drainage area (9). The stem (1) may be pushed out of the cylinder (3) by the compression spring (17) and may be drawn into the cylinder (3) when hydraulic fluid is applied to the inflow area (5). This controlling motor is particularly suitable for driving a rising stem quick-action stop valve (23), such as those often used for example in steam power stations.

Description

Beschreibungdescription
Stellmotor, insbesondere für ein SchneilschlußventilActuator, in particular for a cut-off valve
Die Erfindung betrifft einen Stellmotor zum Verschieben einer Stange entlang einer Achse, mit einem hydraulischen Aktuator mit einem Zylinder, in dem ein mit der Stange kraftschlüssig verbundener Kolben gleitend und dichtend gelagert ist, einer mit der Stange kraftschlüssig verbundenen und dem Aktuator entgegenwirkenden Druckfeder sowie einem Auslöser mit einem Zuflußbereich, der mit einem Hydraulikfluid beaufschlagbar ist, einem mit dem Zuflußbereich durch eine Blende verbunde¬ nen Druckbereich, an den der Aktuator angeschlossen ist, ei¬ nem Ablaufbereich, aus dem Hydraulikfluid drucklos abführbar ist und einem Schaltelement, welches den Druckbereich mit dem Ablaufbereich verbindet, wenn ein positives Druckgefälle von dem Druckbereich zu dem Zuflußbereich auftritt, und ansonsten den Ablaufbereich absperrt.The invention relates to a servomotor for displacing a rod along an axis, with a hydraulic actuator with a cylinder in which a piston which is non-positively connected to the rod is mounted in a sliding and sealing manner, a compression spring which is non-positively connected to the rod and counteracts the actuator, and a trigger with an inflow area which can be acted upon by a hydraulic fluid, a pressure area connected to the inflow area by a diaphragm to which the actuator is connected, a discharge area from which hydraulic fluid can be discharged without pressure and a switching element which connects the pressure area with the Drain area connects when a positive pressure drop from the pressure area to the inflow area occurs and otherwise blocks the drain area.
Die Erfindung bezieht sich insbesondere auf einen Stellmotor für ein Schnellschlußventil, wie es beispielsweise an einer Dampfturbine, für die eine Möglichkeit zum schnellen Still¬ setzen erforderlich ist, eingesetzt wird. Dies ist der Fall an praktisch jeder Dampfturbine, die einen Generator zur Er- zeugung elektrischen Stroms antreibt, sowohl in einem Kraft¬ werk als auch an einer Industrieanlage. Auch eine Dampftur¬ bine, die einen Kompressor oder dergleichen in einer chemi¬ schen Anlage betreibt, muß üblicherweise mit einem derartigen Schnellschlußventil nebst zugehörigem Stellmotor versehen sein.The invention relates in particular to a servomotor for a quick-closing valve, as is used, for example, on a steam turbine, for which a possibility for rapid shutdown is required. This is the case on practically every steam turbine which drives a generator for generating electrical current, both in a power plant and in an industrial plant. A steam turbine, which operates a compressor or the like in a chemical plant, must usually also be provided with such a quick-closing valve along with the associated servomotor.
Aus der DD 263 801 AI geht ein Stellmotor der eingangs ge¬ nannten Art für ein Schnellschlußventil hervor.Bei diesem ist der Druckbereich .gegeben durch einen von dem Kolben, welcher mit der Stange kraftschlüssig verbunden und in dem Zylinder gleitend gelagert ist, abgegrenzten Bereich des Zylinders so¬ wie einen zu dem Schaltelement, welches eine Platte ist, füh- renden Rohrstutzen. Die Platte wird durch eine Druckfeder auf dem Rohrstutzen gepreßt und schließt diesen weitestgehend ab. In der Platte ist eine Blende vorgesehen, durch die der ober¬ halb der Platte liegende Zustellbereich mit dem unterhalb der Platte liegenden Druckbereich kommuniziert. Ein äußerer Rohr¬ stutzen, welcher den bereits genannten Rohrstutzen umringt, umgrenzt den kreisringförmigen Ablaufbereich, durch den Hy¬ draulikfluid abfließen kann, wenn die Platte durch Hydraulik¬ fluid aus dem Druckbereich angehoben wird, was eintritt, wenn der Druck des Hydraulikfluides in den Zuflußbereich sich ver¬ ringert und ein positives Druckgefälle vom Druckbereich zum Zuflußbereich auftritt.From the DD 263 801 AI an actuator of the type mentioned for a quick-closing valve emerges. In this is the pressure range . given by an area of the cylinder delimited by the piston, which is non-positively connected to the rod and is slidably mounted in the cylinder, and an area leading to the switching element, which is a plate. pipe socket. The plate is pressed onto the pipe socket by a compression spring and largely closes it off. A panel is provided in the plate, through which the infeed area above the plate communicates with the pressure area below the plate. An outer pipe socket, which surrounds the already mentioned pipe socket, delimits the annular drainage area through which hydraulic fluid can flow out when the plate is raised from the pressure area by hydraulic fluid, which occurs when the pressure of the hydraulic fluid in the inflow area is reduced and a positive pressure drop occurs from the pressure area to the inflow area.
Der Stellmotor gemäß der DD 263 801 AI zeichnet sich dadurch aus, daß er aus einem einzigen Zustellsystem für das Hydrau¬ likfluid betrieben werden kann. Soll das Schnellschlußventil, an das der Stellmotor angeschlossen ist, geöffnet werden, so genügt es, dem Zuflußbereich Hydraulikfluid zuzustellen und so in dem Zuflußbereich einen Druck aufzubauen. Dieser Druck preßt die Platte auf die Rohrstutzen und verhindert ein Ab¬ laufen des Hydraulikfluides in den Ablaufbereich; durch die Blende in der Platte gelangt das Hydraulikfluid in den Druck¬ bereich und sorgt dort für einen allmählichen Druckaufbau, wodurch der Kolben, welcher von einer entsprechenden Druckfe- der in eine Anfangslage gedrückt ist, in eine Endlage ver¬ schoben wird und das Schnellschlußventil öffnet. Zum Auslösen des Schnellεchlusses genügt es, den Druck in dem Zustellsy¬ stem um ein hinreichendes Maß abfallen zu lassen; in diesem Fall hebt die Platte von dem Rohrstutzen ab und gibt den Ab- laufbereich frei, so daß das Hydraulikfluid weitgehend druck¬ los abströmen kann und eine Rückbewegung des Kolbens durch die Kraft der Druckfeder in die Anfangslage ermöglicht. Der Stellmotor ist weiterhin eingerichtet zur Bedienung eines so¬ genannten aufstoßenden Ventils, d.h. eines Ventils mit einem ringförmigen Ventilsitz und einem dazu passenden Ventilkegel, der an einer dem Ventilsitz zugewandten Seite an einer Spin¬ del befestigt ist, die durch den Ventilsitz hindurchragt; an diese Spindel muß der Stellmotor derart angeschlossen werden, daß sich der Ventilsitz zwischen dem Ventilkegel und dem Stellmotor befindet.The servomotor according to DD 263 801 AI is characterized in that it can be operated from a single feed system for the hydraulic fluid. If the quick-closing valve to which the servomotor is connected is to be opened, it is sufficient to supply hydraulic fluid to the inflow area and thus to build up a pressure in the inflow area. This pressure presses the plate onto the pipe socket and prevents the hydraulic fluid from running off into the discharge area; through the orifice in the plate, the hydraulic fluid reaches the pressure area and there ensures a gradual pressure build-up, whereby the piston, which is pressed into a starting position by a corresponding pressure spring, is pushed into an end position and the quick-closing valve opens . To trigger the quick closing, it is sufficient to drop the pressure in the delivery system by a sufficient amount; in this case the plate lifts off the pipe socket and clears the drainage area, so that the hydraulic fluid can flow largely without pressure and enables the piston to move back into the initial position by the force of the compression spring. The servomotor is also set up to operate a so-called push-up valve, ie a valve with an annular valve seat and a matching valve cone, which is fastened to a spindle on a side facing the valve seat and which projects through the valve seat; on this spindle must be connected to the actuator so that the valve seat is between the valve plug and the actuator.
Der Stellmotor ist ungeeignet zur Bedienung eines sogenannten aufziehenden Ventils, welches ebenfalls einen ringförmigen Ventilsitz mit passendem Ventilkegel an einer Spindel auf¬ weist, wobei allerdings die Spindel nicht durch den Ventil¬ sitz hindurchragt, sondern an einer dem Ventilsitz abgewand- ten Seite des Ventilkegels mit diesem verbunden ist; einThe servomotor is unsuitable for operating a so-called pull-up valve, which likewise has an annular valve seat with a suitable valve cone on a spindle, although the spindle does not protrude through the valve seat, but on a side of the valve cone facing away from the valve seat this is connected; on
Stellmotor ist derart an die Spindel anzuschließen, daß sich der Ventilkegel zwischen dem Ventilsitz und dem Stellmotor befindet.The servomotor must be connected to the spindle in such a way that the valve cone is located between the valve seat and the servomotor.
Ein aufziehendes Ventil ermöglicht es, die Spindel von Fluid fernzuhalten, welches das geöffnete Ventil durchströmt; dies ist bei einem aufstoßenden Ventil nicht möglich, da die Spin¬ del stets durch den von dem Fluid zu durchströmenden Ventil¬ sitz ragt. Ein aufziehendes Ventil bietet daher gegenüber ei- nem aufstoßenden Ventil in der Regel einen betrieblichen Vor¬ teil.A winding valve makes it possible to keep the spindle away from fluid which flows through the opened valve; this is not possible in the case of an opening valve, since the spindle always protrudes through the valve seat through which the fluid flows. An opening valve therefore generally offers an operational advantage over an opening valve.
Aufgabe der Erfindung ist es, einen anderen Stellmotor der eingangs genannten Art anzugeben, der sich insbesondere zum Anschluß an ein sogenanntes aufziehendes Schnellschlußventil eignet.The object of the invention is to provide another servomotor of the type mentioned, which is particularly suitable for connection to a so-called opening quick-closing valve.
Zur Lösung dieser Aufgabe wird ein Stellmotor zum Verschieben einer Stange entlang einer Achse angegeben mit einem hydrau- lischen Aktuator mit einem Zylinder, in dem ein mit der Stan¬ ge kraftschlüssig verbundener Kolben gleitend und dichtend gelagert ist, einer mit der Stange kraftschlüssig verbundenen und dem Aktuator entgegenwirkenden Druckfeder sowie einem Auslöser mit einem Zuflußbereich, der mit einem Hydraulik- fluid beaufschlagbar ist, einem mit dem Zuflußbereich durch eine Blende verbundenen Druckbereich, an den der Aktuator an¬ geschlossen ist, einem Ablaufbereich, aus dem Hydraulikfluid drucklos abführbar ist, und einem Schaltelement, welches den Druckbereich mit dem Ablaufbereich verbindet, wenn ein posi¬ tives Druckgefälle von dem Druckbereich zu dem Zuflußbereich auftritt, und ansonsten den Ablaufbereich absperrt, wobei die Stange durch die Druckfeder aus dem Zylinder herausschiebbar und durch Beaufschlagung des Zylinders mit dem Hydraulikfluid in den Zylinder hineinziehbar ist.To achieve this object, a servomotor for moving a rod along an axis is specified with a hydraulic actuator with a cylinder in which a piston which is connected to the rod in a friction-locked manner is mounted in a sliding and sealing manner, one which is connected to the rod in a friction-locked manner and the Actuator counteracting compression spring and a trigger with an inflow area, which can be acted upon by a hydraulic fluid, a pressure area connected to the inflow area by a diaphragm, to which the actuator is connected, an outflow area from the hydraulic fluid can be discharged without pressure, and a switching element which connects the pressure area to the drain area when a positive pressure drop occurs from the pressure area to the inflow area, and otherwise shuts off the drain area, the rod being able to be pushed out of the cylinder by the compression spring and by acting on the Cylinder with the hydraulic fluid is pulled into the cylinder.
Mit diesem Stellmotor werden insbesondere die Vorteile er- schlössen, die der aus dem Stand der Technik hervorgehende, für ein aufstoßendes Ventil bestimmte Stellmotor bietet. Der erfindungsgemäße Stellmotor ist relativ einfach bedienbar, da er nur ein einziges Zustellsystem für Hydraulikfluid erfor¬ dert, und er ermöglicht den Einsatz an einem aufziehenden Schnellschlußventil, d.h. einem Schnellschlußventil, bei dem ein Schließorgan zum Öffnen über eine Ventilspindel angezogen wird. Ein solches Schnellschlußventil hat den Vorzug, daß die zum Aufziehen des Schließorgans dienende Ventilspindel wäh¬ rend des regulären Betriebs, d.h. während das Schnellschluß- ventil von einem Fluid wie z.B. Dampf durchströmt wird, dem Fluid nicht unmittelbar ausgesetzt sein muß; dies bedeutet, daß in wesentlich geringerem Umfang als bei einem aufzu¬ stoßenden Schnellschlußventil die Gefahr von Schäden durch Korrosion, Erosion oder Ablagerungen besteht und außerdem ein Stömungshindernis, nämlich die in das Schnellschlußventil hineinragende Ventilspindel, vermieden wird.This servomotor in particular opens up the advantages offered by the servomotor which is based on the prior art and which is intended for an opening valve. The servomotor according to the invention is relatively easy to operate, since it only requires a single delivery system for hydraulic fluid, and it enables use on an opening quick-closing valve, i.e. a quick-closing valve, in which a closing element is opened for opening via a valve spindle. Such a quick-closing valve has the advantage that the valve spindle used to open the closing element during normal operation, i.e. while the quick-closing valve is filled with a fluid such as e.g. Steam is flowed through, the fluid need not be directly exposed; This means that to a much lesser extent than in the case of a quick-closing valve to be pushed open there is the risk of damage due to corrosion, erosion or deposits, and an obstacle to flow, namely the valve stem projecting into the quick-closing valve, is avoided.
Das Schaltelement in dem Stellmotor ist vorteilhafterweise eine im Zuflußbereich angeordnete Platte, welche dichtend auf zwei Rohrstutzen, die den Druckbereich und den Ablaufbereich abgrenzen, aufliegt.The switching element in the servomotor is advantageously a plate which is arranged in the inflow region and which lies sealingly on two pipe sockets which delimit the pressure region and the outlet region.
Diese Platte enthält mit weiterem Vorteil auch die Blende in Form einer kleinen Bohrung; im Rahmen dieser Ausgestaltung wird eine besonders kompakte Form des Auslösers erreicht. Die Platte wird vorzugsweise mit einer weiteren Druckfeder auf die Rohrstutzen gepreßt und ermöglicht somit, den Auslöser in beliebiger räumlicher Lage anzuordnen.This plate also advantageously contains the aperture in the form of a small hole; In this configuration, a particularly compact shape of the trigger is achieved. The plate is preferably on with another compression spring pressed the pipe socket and thus allows to arrange the trigger in any spatial position.
Weiterhin ist es von Vorteil, den Aktuator mit dem Auslöser baulich zu vereinigen, insbesondere in der Weise, daß der Auslöser, von der Stange entlang der Achse gesehen, hinter dem Aktuator angeordnet ist. Auf diese Weise kann der Stell¬ motor als kompakte, weitgehend zylindrische Einheit ausge¬ führt werden.Furthermore, it is advantageous to structurally combine the actuator with the trigger, in particular in such a way that the trigger, as seen from the rod along the axis, is arranged behind the actuator. In this way, the servomotor can be designed as a compact, largely cylindrical unit.
Mit weiterem Vorteil begrenzt der Kolben zwischen sich und einer Stirnwand des Zylinders, durch welche die Stange ge¬ führt ist und zu der hin er von der Druckfeder gepreßt wird, einen mit dem Hydraulikfluid beaufschlagbaren Kraftraum und weist zumindest eine Bohrung auf, durch die der Kraftraum mit dem Druckbereich kommuniziert. Diese Ausgestaltung erlaubt eine besonders kompakte Ausführung des Stellmotors, wobei der Auslöser von der Stange aus gesehen hinter dem Aktuator liegt, was auch der Wirksamkeit des Stellmotors, insbesondere der bei einem Schnellschluß erzielbaren Geschwindigkeit, zu¬ gute kommt.With further advantage, the piston between it and an end wall of the cylinder, through which the rod is guided and to which it is pressed by the compression spring, delimits a force space that can be acted upon by the hydraulic fluid and has at least one bore through which the force space communicates with the printing area. This configuration permits a particularly compact design of the servomotor, the trigger being located behind the actuator as seen from the rod, which also benefits the effectiveness of the servomotor, in particular the speed that can be achieved in the event of a quick close.
Die Verbindung zwischen dem Kraftraum und dem Druckbereich ist vorteilhafterweise ausgeführt als eine längenveränderli- ehe Rohrverbindung. Eine derartige Rohrverbindung ist insbe¬ sondere gebildet mit zwei dichtend ineinandergesteckten Rohr¬ stutzen, wobei einer der Rohrstutzen mit dem ortsfesten Aus¬ löser und ein anderer Rohrstutzen mit dem beweglichen Kolben verbunden ist. Auf dem mit dem Auslöser verbundenen Rohrstut- zen liegt vorteilhafterweise die erwähnte Platte als Schalt¬ element auf.The connection between the weight room and the pressure area is advantageously designed as a variable-length pipe connection. Such a pipe connection is in particular formed with two sealingly plugged pipe sockets, one of the pipe sockets being connected to the stationary trigger and another pipe socket being connected to the movable piston. The plate mentioned advantageously rests as a switching element on the pipe socket connected to the trigger.
Die den Kolben pressende Druckfeder ist vorzugsweise in dem Ablaufbereich angeordnet; derart wird sie während des Betrie- bes von dem Hydraulikfluid benetzt und somit in gewissem Um¬ fang gegen Korrosion geschützt, außerdem kommt diese Anord¬ nung der Kompaktheit des Stellmotors zugute. Im Rahmen einer weiteren bevorzugten Ausgestaltung begrenzt der Kolben zwischen sich und einer Stirnwand des Zylinders, durch die die Stange geführt ist, einen mit dem Hydraulik- fluid beaufschlagbaren Kraftraum und weist einen in denThe compression spring pressing the piston is preferably arranged in the discharge area; in this way it is wetted by the hydraulic fluid during operation and thus to a certain extent protected against corrosion, and this arrangement also benefits the compactness of the servomotor. In the context of a further preferred embodiment, the piston delimits between itself and an end wall of the cylinder, through which the rod is guided, a force space which can be acted upon by the hydraulic fluid and has one in the
Kraftraum ragenden Vorsprung auf, der in eine entsprechende Ausnehmung der Stirnwand unter Belassung eines Spaltes ein¬ tauchen kann. Diese Ausgestaltung, die sich insbesondere auf den Kolben bezieht, kann mit weiterem Vorteil selbstverständ- lieh kombiniert werden mit bereits erwähnten Ausgestaltungen des Stellmotors. Die soeben beschriebene Ausgestaltung ermög¬ licht es, beim Auslösen des Stellmotors den Kolben kurz vor dem Erreichen der Anfangslage abzubremsen; dies deshalb, weil dann, wenn der Vorsprung des Kolbens in die Ausnehmung der Stirnwand eintaucht, in dem Kraftraum zwei nur durch den er¬ wähnten Spalt miteinander kommunizierende Räume gebildet wer¬ den, wobei aus einem Raum das Hydraulikfluid durch den Spalt ablaufen muß, was je nach Größe dieses Spaltes und des dem- entsprechenden Strömungswiderstandes, den der Spalt dem Hy- draulikfluid entgegensetzt, nur in deutlich verlangsamterA projection protruding from the weight space, which can dip into a corresponding recess in the end wall while leaving a gap. This embodiment, which relates in particular to the piston, can of course be combined with further advantage with the embodiments of the servomotor already mentioned. The embodiment just described makes it possible to brake the piston shortly before reaching the initial position when the servomotor is triggered; this is because when the projection of the piston dips into the recess in the end wall, two spaces communicating with one another only through the aforementioned gap are formed in the weight room, the hydraulic fluid having to drain out of one space, which is what depending on the size of this gap and the corresponding flow resistance, which the gap opposes to the hydraulic fluid, only in a significantly slower manner
Weise möglich ist. Auf diese Weise kommt es zu einer Abbrem- sung des Kolbens kurz vor Erreichen seiner Anfangslage, was zur Vermeidung von Schäden an dem Stellmotor selbst und an einem Ventil oder dergleichen, mit dem der Stellmotor verbun- den ist, einen wesentlichen Beitrag liefert. Die beschriebene Wirkung wird insbesondere dann erzielt, wenn der Kolben zu¬ mindest eine Bohrung aufweist, durch die der Kraftraum mit dem Druckbereich des Auslösers kommuniziert und die den Vor¬ sprung durchquert. Somit erfolgt nach einer Auslösung der Ab- fluß von Hydraulikfluid aus dem Kraftraum zumindest teilweise durch den Spalt und liefert den gewünschten Bremseffekt.Way is possible. In this way, the piston is braked shortly before it reaches its initial position, which makes a significant contribution to avoiding damage to the servomotor itself and to a valve or the like to which the servomotor is connected. The effect described is achieved in particular when the piston has at least one bore through which the force space communicates with the pressure area of the trigger and which crosses the projection. Thus, after triggering, the outflow of hydraulic fluid from the power room takes place at least partially through the gap and provides the desired braking effect.
Der Stellmotor jedweder Ausgestaltung eignet sich besonders zum Antrieb eines Ventils, insbesondere eines Schnellschluß- ventils. Der Stellmotor jedweder Ausgestaltung findet insbesondere Verwendung zur Herbeiführung eines Schnellschlusses an einem Ventil, insbesondere einem Schnellschlußventil, in einer Dampfkraftanlage.The servomotor of any configuration is particularly suitable for driving a valve, in particular a quick-closing valve. The servomotor of any configuration is used in particular to bring about a quick close on a valve, in particular a quick close valve, in a steam power plant.
Es sei bemerkt, daß die erfindungsgemäße Austattung eines Stellmotors mit einem Auslöser keineswegs beschränkt ist auf Stellmotore, die ausschließlich zum Antrieb von Schnell¬ schlußventilen dienen. Es ist keineswegs ausgeschlossen, ei- nen erfindungsgemäßen Stellmotor weiter zu ertüchtigen dahin¬ gehend, daß er außer zur Durchführung eines Schnellschlusses unter Benutzung des Auslösers für eine kontinuierliche und gesteuerte Verschiebung der Stange ertüchtigt ist.It should be noted that the equipment of a servomotor with a trigger according to the invention is in no way limited to servomotors which are used exclusively to drive quick-closing valves. It is by no means excluded that a servomotor according to the invention can be further strengthened such that it is trained for a continuous and controlled displacement of the rod in addition to performing a quick close using the trigger.
Ausführungsbeispiele der Erfindung werden nunmehr anhand der Zeichnung näher erläutert. Die Zeichnung zeigt jeweils nur diejenigen Komponenten des jeweiligen Ausführungsbeispiels, die für die Erläuterung wichtig sind; Komponenten, auf die es im vorliegenden Zusammenhang nicht unbedingt ankommt, sind der Einfachheit halber nicht dargestellt. Insbesondere wurde davon abgesehen, allfällig notwendige Befestigungsmittel wie z.B. Schrauben darzustellen. Es versteht sich, daß bei der Realisierung der Erfindung auf derartige Komponenten im Rah¬ men des fachmännischen Ermessens und Abwägens Bedacht zu neh- men ist. Darüber hinaus erhebt die Zeichnung in keiner Weise den Anspruch, maßstabsgerecht für eine konkrete Ausführungs¬ form zu sein.Embodiments of the invention will now be explained in more detail with reference to the drawing. The drawing shows only those components of the respective embodiment that are important for the explanation; Components that are not essential in the present context are not shown for the sake of simplicity. In particular, it was refrained from any necessary fasteners such as To represent screws. It goes without saying that when realizing the invention, such components should be taken into account within the framework of expert judgment and weighing. In addition, the drawing in no way claims to be to scale for a specific embodiment.
Figur 1 zeigt einen Stellmotor zum Verschieben einer Stange 1 entlang einer Achse 2, wobei die Stange 1 aus einer Stirnwand 15 eines Zylinders 3 herausragt. Durch die Kraft einer Druck¬ feder 17, welche an einem in dem Zylinder 3 beweglich gela¬ gerten und mit der Stange 1 verbundenen und mit einer Druck¬ feder 17 belasteten Kolben 14 angreift, ist die Achse 2 aus dem Zylinder 3 herausschiebbar und kann durch Beaufschlagung des mit dem Zylinder 3 und dem Kolben 14 gebildeten hydrauli¬ schen Aktuators mit Hydraulikfluid, insbesondere Hydrauliköl, in den Zylinder 3 hineingezogen werden. Hierfür ist zwischen dem Kolben 14 und der Stirnwand 15 ein in seiner Größe verän¬ derlicher und durch den Kolben 14 gegen andere Bereiche des Zylinders 3 abgegrenzter Kraftraum 16 vorgesehen. Der Kraft- räum 16 wird über einen Auslöser 4 mit dem Hydraulikfluid be¬ aufschlagt.Figure 1 shows an actuator for moving a rod 1 along an axis 2, the rod 1 protruding from an end wall 15 of a cylinder 3. Due to the force of a compression spring 17, which acts on a piston 14 movably mounted in the cylinder 3 and connected to the rod 1 and loaded with a compression spring 17, the axis 2 can be pushed out of the cylinder 3 and can pass through Actuation of the hydraulic actuator formed with the cylinder 3 and the piston 14 with hydraulic fluid, in particular hydraulic oil, be drawn into the cylinder 3. For this purpose, between the piston 14 and the end wall 15 a variable in size and defined by the piston 14 against other areas of the cylinder 3 force space 16 is provided. The force chamber 16 is acted upon by the hydraulic fluid via a trigger 4.
Der Auslöser 4 ist, von der Stange 1 aus entlang der Achse 2 gesehen, hinter dem Aktuator 3, 14 angeordnet. Der Auslöser 4 hat einen Zuflußbereich 5, der aus einem Zustellsystem 6 mit dem Hydraulikfluid beaufschlagbar ist. Zur Verdeutlichung der Funktion dieses Zustellsystems 6 sind dargestellt eine Hy¬ draulikpumpe 24, welche das Hydraulikfluid in dem Zustellsy¬ stem 6 unter einen bestimmten Druck setzen kann, sowie ein Stellventil 25, durch das das Hydraulikfluid gegebenenfalls aus dem Zustellsystem 6 ablaufen kann und somit den Druck in dem Zustellsystem 6 verringert. Zur Beaufschlagung des Stell¬ motors mit Hydraulikfluid ist das Stellventil 25 geschlossen, so daß sich in dem Zuflußbereich 5 ein Druck aufbauen kann. Durch diesen Druck wird ein Schaltelement 10 des Auslösers 4, nämlich eine Platte 10, auf zwei zueinander konzentrische Rohrstutzen 11 und 12 gepreßt. Der innere Rohrstutzen 12 bil¬ det in seinem Inneren den Druckbereich 7, welcher durch eine Blende 8, nämlich eine Bohrung 8 in der Platte 10, mit dem Zuflußbereich 5 kommuniziert. Beim Aufbau des Drucks in dem Zuflußbereich 5 baut sich somit auch ein Druck in dem Druck¬ bereich 7 auf. Zwischen dem inneren Rohrstutzen 12 und dem äußeren Rohrstutzen 11 liegt ein Ablaufbereich 9, aus dem Hy¬ draulikfluid drucklos abführbar ist. Dazu dienen Ablaufboh- rungen 26, für die in Fig. 1 mehrere Möglichkeiten einge¬ zeichnet sind. Eine weitere Druckfeder 13 drückt die Platte 10 auf die Rohrstutzen 11 und 12, um somit sicherzustellen, daß im Regelfall zwischen beiden Rohrstutzen 11 und 12 sowie der Platte 10 Dichtungen, die im einzelnen nicht dargestellt sind, wirksam sind. Die weitere Druckfeder 13 kann so ausge¬ legt werden, daß ein Betrieb des Stellmotors in jeder räumli¬ chen Lage möglich ist. Fließt nun dem Druckbereich 7 aus dem Zuflußbereich 5 Hydraulikfluid zu, so gelangt dieses durch den inneren Rohrstutzen 12 sowie einen an dem Kolben 14 befe¬ stigten und auf dem inneren Rohrstutzen 12 gleitenden Rohr¬ stutzen 19 sowie in dem Kolben 14 befindliche Bohrungen 18 in den Kraftraum 16. Dadurch wird der Kolben 14 gegen die Kraft der Druckfeder 17, welche sich an dem Zylinder 3 abstützt, von der Stirnwand 15 weggeschoben und zieht somit die Stange 1 in den Zylinder 3 hinein. Für die Anwendung an einem Schnellschlußventil ist der in dem Kraftraum 16 aufzubauende Druck so zu bemessen, daß der Kolben 14 eine vorgegebene End¬ lage erreicht. Diese Endlage behält der Kolben 14 bei, solan¬ ge der Druck in dem Zuflußbereich 5 hinreichend konstant bleibt.The trigger 4, as seen from the rod 1 along the axis 2, is arranged behind the actuator 3, 14. The trigger 4 has an inflow region 5 which can be acted upon by the hydraulic fluid from a delivery system 6. To illustrate the function of this delivery system 6, a hydraulic pump 24 is shown which can pressurize the hydraulic fluid in the delivery system 6 and a control valve 25 through which the hydraulic fluid can optionally flow out of the delivery system 6 and thus the Pressure in the delivery system 6 reduced. To apply hydraulic fluid to the actuator, the control valve 25 is closed, so that a pressure can build up in the inflow region 5. This pressure causes a switching element 10 of the trigger 4, namely a plate 10, to be pressed onto two pipe sockets 11 and 12 which are concentric with one another. The inner pipe socket 12 forms the pressure area 7 in its interior, which communicates with the inflow area 5 through an orifice 8, namely a bore 8 in the plate 10. When the pressure in the inflow region 5 builds up, a pressure also builds up in the pressure region 7. Between the inner pipe socket 12 and the outer pipe socket 11 there is an outlet area 9 from which hydraulic fluid can be removed without pressure. Drain bores 26 serve this purpose, for which several possibilities are shown in FIG. 1. Another compression spring 13 presses the plate 10 onto the pipe socket 11 and 12, thus ensuring that seals, which are not shown in detail, are generally effective between the two pipe socket 11 and 12 and the plate 10. The further compression spring 13 can be designed such that the servomotor can be operated in any spatial position. Now flows from the pressure area 7 Inflow area 5 hydraulic fluid, it passes through the inner pipe socket 12 and a pipe socket 19 fastened to the piston 14 and sliding on the inner pipe socket 12 and bores 18 located in the piston 14 into the weight space 16. This causes the piston to become 14 against the force of the compression spring 17, which is supported on the cylinder 3, pushed away from the end wall 15 and thus pulls the rod 1 into the cylinder 3. For use on a quick-closing valve, the pressure to be built up in the force space 16 is to be dimensioned such that the piston 14 reaches a predetermined end position. The piston 14 maintains this end position as long as the pressure in the inflow region 5 remains sufficiently constant.
Wenn der Druck in dem Zuflußbereich 5 absinkt, so bildet sich aufgrund des relativ großen Strömungswiderstandes der BlendeIf the pressure in the inflow region 5 drops, the orifice forms due to the relatively large flow resistance
8 eine positive Druckdifferenz vom Druckbereich 7 zum Zuflu߬ bereich 5 aus, welche bei hinreichend hohem Druckabfall in dem Zuflußbereich 5 die Platte 10 gegen die Kraft der weite- ren Druckfeder 13 (oder, falls die weitere Druckfeder 13 nicht vorhanden ist, gegen die auf die Platte 10 einwirkende Schwerkraft) von dem Rohrstutzen 11 und 12 abhebt und somit eine Verbindung zwischen dem Druckbereich 7 und dem Ablaufbe¬ reich 9 freigibt. Daß sich im vorliegenden Fall auch eine Verbindung zwischen dem Zuflußbereich 5 und dem Ablaufbereich8 a positive pressure difference from the pressure area 7 to the inflow area 5, which, when the pressure drop in the inflow area 5 is sufficiently high, the plate 10 against the force of the further pressure spring 13 (or, if the further pressure spring 13 is not present, against the pressure the plate 10 acting gravity) lifts off the pipe socket 11 and 12 and thus releases a connection between the pressure area 7 and the drain area 9. That in the present case there is also a connection between the inflow area 5 and the outflow area
9 ergibt, ist von untergeordneter Bedeutung. Beim Abheben der Platte 10 kann jedenfalls die Druckfeder 17 den Kolben 14 wieder zur Stirnwand 15 in die Anfangslage schieben und dabei das Hydraulikfluid durch die Bohrungen 18 sowie die Rohrstut- zen 19 und 12 in dem Ablaufbereich 9 befördern. Derart ergibt sich eine schlagartige Bewegung des Kolbens 14 hin zur Stirn¬ wand 15, und die Stange 1 wird ebenfalls schlagartig aus dem Zylinder 3 hinausgeschoben. Derart kann in kürzester Zeit ein Schnellschlußventil oder dergleichen geschlossen werden. Die- ser Vorgang wird als "Auslösung" des Auslösers bezeichnet. 9 results is of minor importance. When the plate 10 is lifted off, the compression spring 17 can in any case push the piston 14 back to the end wall 15 into the initial position and thereby convey the hydraulic fluid through the bores 18 and the pipe sockets 19 and 12 in the outlet area 9. This results in an abrupt movement of the piston 14 towards the end wall 15, and the rod 1 is likewise abruptly pushed out of the cylinder 3. In this way, a quick-closing valve or the like can be closed in the shortest possible time. This process is called "triggering" the trigger.

Claims

Patentansprüche claims
1. Stellmotor zum Verschieben einer Stange (1) entlang einer Achse (2) , mit einem hydraulischen Aktuator (3, 14) mit einem Zylinder (3), in dem ein mit der Stange (2) kraftschlüssig verbundener Kolben (14) gleitend und dichtend gelagert ist, einer mit der Stange (2) kraftschlüssig verbundenen und dem Aktuator (3, 14) entgegenwirkenden Druckfeder (17) sowie ei¬ nem Auslöser (4) mit einem Zuflußbereich (5) , der mit einem Hydraulikfluid beaufschlagbar ist, einem mit dem Zuflußbe¬ reich (5) durch eine Blende (8) verbundenen Druckbereich (7), an den der Aktuator (3, 14) angeschlossen ist, einem Ablauf- bereich (9), aus dem Hydraulikfluid drucklos abführbar ist, und einem Schaltelement (10), welches den Druckbereich (7) mit dem Ablaufbereich (9) verbindet, wenn ein positives1. Actuator for moving a rod (1) along an axis (2), with a hydraulic actuator (3, 14) with a cylinder (3) in which a piston (14) with the rod (2) non-positively connected and sliding is mounted in a sealed manner, a compression spring (17) which is connected to the rod (2) in a non-positive manner and counteracts the actuator (3, 14) and a trigger (4) with an inflow region (5) which can be acted upon by hydraulic fluid, one with the inflow area (5) through a diaphragm (8) connected pressure area (7) to which the actuator (3, 14) is connected, an outlet area (9) from which hydraulic fluid can be discharged without pressure, and a switching element ( 10), which connects the pressure area (7) with the drain area (9) if a positive
Druckgefälle von dem Druckbereich (7) zu dem Zuflußbereich (5) auftritt und ansonsten den Ablaufbereich (9) absperrt, d a d u r c h g e k e n n z e i c h n e t , daß die Stan¬ ge (1) durch die Druckfeder (17) aus dem Zylinder (3) heraus- schiebbar und durch Beaufschlagung des Zuflußbereichs (5) mit dem Hydraulikfluid in den Zylinder (3) hineinziehbar ist.Pressure drops from the pressure area (7) to the inflow area (5) occur and otherwise shut off the drain area (9), characterized in that the rods (1) can be pushed out of the cylinder (3) and through by the pressure spring (17) Actuation of the inflow region (5) with the hydraulic fluid can be drawn into the cylinder (3).
2. Stellmotor nach Anspruch 1, bei dem das Schaltelement (10) eine im Zuflußbereich(5) angeordnete Platte(10) ist, welche dichtend auf zwei Rohrstutzen(11,12) , die den Druckbereich(7) und den Ablaufbereich(9) abgrenzen,aufliegt.2. Servomotor according to claim 1, in which the switching element (10) is a plate (10) arranged in the inflow region (5), which plate sealingly on two pipe sockets (11, 12), the pressure region (7) and the outlet region (9) delimit, rests.
3. Stellmotor nach Anspruch 2, bei dem die Platte(10) die Blende(8) enthält.3. Servomotor according to claim 2, wherein the plate (10) contains the diaphragm (8).
4. Stellmotor nach Anspruch 2 oder 3, bei dem die Platte(10) mit einer weiteren Druckfeder(13) auf die Rohrstutzen(11,12) gepreßt wird.4. Servomotor according to claim 2 or 3, wherein the plate (10) with a further compression spring (13) on the pipe socket (11,12) is pressed.
5. Stellmotor nach einem der vorhergehenden Ansprüche, bei dem der Aktuator(3, 14) mit dem Auslöser(4) baulich vereinigt ist. 5. Servomotor according to one of the preceding claims, in which the actuator (3, 14) is structurally combined with the trigger (4).
6. Stellmotor nach Anspruch 5, bei dem der Auslöser(4), von der Stange(1) aus entlang der Achse(2) gesehen, hinter dem Aktuator (3, 14) angeordnet ist.6. Actuator according to claim 5, wherein the trigger (4), seen from the rod (1) along the axis (2), is arranged behind the actuator (3, 14).
7. Stellmotor nach Anspruch 6, bei dem der Kolben(14) zwi¬ schen sich und einer Stirnwand(15) des Zylinders(3) , durch welche die Stange(1) geführt ist und zu der hin er von der Druckfeder (17) gepreßt wird, einen mit dem Hydraulikfluid beaufschlagbaren Kraftraum(16) begrenzt und zumindest eine Bohrung(18) aufweist, durch die der Kraftraum(16) mit dem Druckbereich(7) kommuniziert.7. Actuator according to claim 6, in which the piston (14) between itself and an end wall (15) of the cylinder (3) through which the rod (1) is guided and to which it extends from the compression spring (17) is pressed, delimits a force space (16) which can be acted upon by the hydraulic fluid and has at least one bore (18) through which the force space (16) communicates with the pressure region (7).
8. Stellmotor nach Anspruch 7, bei dem der Kolben(14) über eine längenveränderliche Rohrverbindung(12,19) mit dem Druck¬ bereich(7) verbunden ist.8. Servomotor according to claim 7, in which the piston (14) is connected to the pressure region (7) via a length-variable pipe connection (12, 19).
9. Stellmotor nach Anspruch 8, bei dem die Rohrverbin¬ dung(12,19) gebildet ist mit zwei dichtend ineinandergesteck- ten Rohrstutzen(12,19) .9. Servomotor according to claim 8, in which the pipe connection (12, 19) is formed with two pipe nipples (12, 19) inserted into one another in a sealing manner.
10. Stellmotor nach einem der Ansprüche 7 bis 9, bei dem die Druckfeder(17) in dem Ablaufbereich(9) angeordnet ist.10. Servomotor according to one of claims 7 to 9, in which the compression spring (17) is arranged in the outlet area (9).
11. Stellmotor nach einem der vorhergehenden Ansprüche, bei dem der Kolben(14) zwischen sich und einer Stirnwand(15) des Zylinders(3) , durch die die Stange(1) geführt ist, einen mit dem Hydraulikfluid beaufschlagbaren Kraftrau (16) begrenzt und einen in den Kraftraum(16) ragenden Vorsprung(20) auf¬ weist, der in eine entsprechende Ausnehmung(21) der Stirn¬ wand(15) unter Belassung eines Spaltes(22) eintauchen kann.11. Actuator according to one of the preceding claims, in which the piston (14) between itself and an end wall (15) of the cylinder (3) through which the rod (1) is guided, limits a hydraulic fluid that can be acted upon by the hydraulic fluid (16) and has a projection (20) projecting into the weight space (16), which can dip into a corresponding recess (21) in the end wall (15) while leaving a gap (22).
12. Stellmotor nach Anspruch 11, bei dem der Kolben(14) zu- mindest eine Bohrung(18) aufweist, durch die der Kraft- raum(16) mit dem Druckbereich(7) kommuniziert und die den Vorsprung(20) durchquert. 12. Servomotor according to claim 11, in which the piston (14) has at least one bore (18) through which the force space (16) communicates with the pressure region (7) and which crosses the projection (20).
13. Stellmotor nach einem der vorhergehenden Ansprüche, der mit einem Ventil (23), insbesondere einem Schnellschlußven¬ til(23), verbunden ist.13. Actuator according to one of the preceding claims, which is connected to a valve (23), in particular a Schnellschlussven¬ valve (23).
14. Verwendung eines Stellmotors nach einem der vorhergehen¬ den Ansprüche zur Herbeiführung eines Schnellschlusses an ei¬ nem Ventil(23) , insbesondere einem Schnellschlußventil (23) , in einer Dampfkraftanlage. 14. Use of a servomotor according to one of the preceding claims to bring about a quick close to a valve (23), in particular a quick close valve (23), in a steam power plant.
EP94929481A 1993-10-29 1994-10-17 Controlling motor, in particular for quick-action stop valves Expired - Lifetime EP0725889B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4337113 1993-10-29
DE4337113 1993-10-29
PCT/DE1994/001228 WO1995012057A1 (en) 1993-10-29 1994-10-17 Controlling motor, in particular for quick-action stop valves

Publications (2)

Publication Number Publication Date
EP0725889A1 true EP0725889A1 (en) 1996-08-14
EP0725889B1 EP0725889B1 (en) 1997-04-23

Family

ID=6501435

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94929481A Expired - Lifetime EP0725889B1 (en) 1993-10-29 1994-10-17 Controlling motor, in particular for quick-action stop valves

Country Status (11)

Country Link
US (1) US5848779A (en)
EP (1) EP0725889B1 (en)
JP (1) JP2762400B2 (en)
CN (1) CN1055148C (en)
BR (1) BR9407901A (en)
CZ (1) CZ286873B6 (en)
DE (1) DE59402560D1 (en)
ES (1) ES2101576T3 (en)
PL (1) PL182380B1 (en)
RU (1) RU2132468C1 (en)
WO (1) WO1995012057A1 (en)

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KR20080037018A (en) * 2005-07-13 2008-04-29 스와겔로크 컴패니 Method and arrangement for actuation
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Also Published As

Publication number Publication date
JPH08511327A (en) 1996-11-26
CZ286873B6 (en) 2000-07-12
PL314006A1 (en) 1996-08-05
RU2132468C1 (en) 1999-06-27
CN1055148C (en) 2000-08-02
JP2762400B2 (en) 1998-06-04
BR9407901A (en) 1996-11-19
ES2101576T3 (en) 1997-07-01
CZ120196A3 (en) 1997-01-15
DE59402560D1 (en) 1997-05-28
WO1995012057A1 (en) 1995-05-04
EP0725889B1 (en) 1997-04-23
CN1133624A (en) 1996-10-16
PL182380B1 (en) 2001-12-31
US5848779A (en) 1998-12-15

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