WO2013164716A1 - Actionneur pneumatique pourvu d'une position finale ajustable - Google Patents

Actionneur pneumatique pourvu d'une position finale ajustable Download PDF

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Publication number
WO2013164716A1
WO2013164716A1 PCT/IB2013/052874 IB2013052874W WO2013164716A1 WO 2013164716 A1 WO2013164716 A1 WO 2013164716A1 IB 2013052874 W IB2013052874 W IB 2013052874W WO 2013164716 A1 WO2013164716 A1 WO 2013164716A1
Authority
WO
WIPO (PCT)
Prior art keywords
pistons
actuator
drive shaft
limit element
box
Prior art date
Application number
PCT/IB2013/052874
Other languages
English (en)
Inventor
Tiziano Bravo
Alessandro Pasquali
Gianpietro TANFOGLIO
Original Assignee
Actuatech S.P.A.
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 Actuatech S.P.A. filed Critical Actuatech S.P.A.
Publication of WO2013164716A1 publication Critical patent/WO2013164716A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/16—Actuating devices; Operating means; Releasing devices actuated by fluid with a mechanism, other than pulling-or pushing-rod, between fluid motor and closure member
    • F16K31/163—Actuating devices; Operating means; Releasing devices actuated by fluid with a mechanism, other than pulling-or pushing-rod, between fluid motor and closure member the fluid acting on a piston
    • F16K31/1635—Actuating devices; Operating means; Releasing devices actuated by fluid with a mechanism, other than pulling-or pushing-rod, between fluid motor and closure member the fluid acting on a piston for rotating valves
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
    • F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
    • F15B15/065—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement the motor being of the rack-and-pinion type
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/24—Other details, e.g. assembly with regulating devices for restricting the stroke

Definitions

  • the present invention relates to a pneumatic actuator, provided with adjustable end-position, of the type used to control the opening and closing of shutoff valves of hydraulic or pneumatic lines.
  • shutoff valves of corresponding hydraulic or pneumatic lines to feed fluids, liquids or gases are used.
  • valves are provided with a rotatable shutter of spherical or butterfly type, or the like, and with an activating shaft to activate the shutter rotation between a completely closed position and a completely open position.
  • an activating shaft to activate the shutter rotation between a completely closed position and a completely open position.
  • a seal gasket is provided between the shutter and the valve body.
  • the rotation of the shaft and therefore of the shutter is 90°.
  • the activating shaft and the shutter can be stopped in any angular position intervening between the two above described positions, such that the instant flow rate can be adjusted to a corresponding target value.
  • valve activating shaft is assigned to a corresponding pneumatic actuator, which is often remote controlled.
  • these actuators comprise a box-shaped body, which can be fed with compressed air, inside which two slidable opposing pistons are housed, movable in opposite directions in response to a pressure increase on the respective outer or inner face.
  • An actuator drive shaft coupled to the activating shaft of the respective valve, is kinematically connected to the pistons, such that the translating movement of the pistons can be converted in a corresponding rotary movement of the drive shaft.
  • the drive shaft is provided with a pinion and each piston is provided with a rack meshing the pinion.
  • a critical state connected to the use of the pneumatic actuator consists in providing the adjustment of the piston stroke, and particularly the end-positions, during installation and even during the planned maintenance.
  • the univocal relation between the angular position of the drive shaft and the flow rate of the fluid passing through the valve has to be checked.
  • the valve shutter Furthermore, it is often required to prevent the valve shutter from applying excessive pressure on the seal gasket of the valve itself when in the completely closed position. Actually, the gasket can be damaged. Therefore, the end-position of the actuator drive shaft corresponding to the closed position of the valve has to be adjustable even to prevent damages to the gasket.
  • the shutter drive shaft is provided with a shoulder designed so as to move alternately into abutment against two countercheck and adjusting screws that are screwed in the actuator body, delimiting the rotation range of the shaft and, as a result, delimiting the actuator stroke.
  • an adjusting screw intended to move into abutment by one side against the pinion of the drive shaft and by the other side against an inner wall of the actuator body, is screwed to one of the pistons.
  • the stroke extent, and thereby the rotation range of the valve shutter, can be adjusted by acting on the screw .
  • the Korean Patent Application KR-A-20110125364 describes a pneumatic actuator remotely controlled, to control the opening and closing of shutoff valves.
  • the end- position adjustment is of a well-known type.
  • a magnet is inserted in the rack of one of the pistons; outside the actuator body a sensor is mounted detecting the magnet position to allow to continuously monitor the position of the piston and, therefore, the position of the valve shutter.
  • Another known solution provides the use of two countercheck and adjusting screws assembled on at least one end flange of the actuator body and prearranged one in line and with interacting the first piston and the other, passing through the first piston, in line and interacting with the second piston.
  • This solution allows to adjust the opening and closing end-positions. Even this solution undergoes a drawback related to the uneven load distribution among the various mechanical members and on the closing flanges of the actuator body. In particular, the forces are distributed differently between the two pistons.
  • object of the present invention is to provide a pneumatic actuator able to solve easily and effectively the drawbacks of the conventional solutions, having also a simple structure.
  • Another object of the present invention is to provide a pneumatic actuator allowing to adjust with complete easiness and accuracy the end-positions of its pistons, both during the installation and the planned maintenance.
  • the present invention concerns a pneumatic actuator according to claim 1 intended to control the rotation of the activating shaft of a shutoff valve.
  • the actuator comprises:
  • a drive shaft intended to be coupled to said activating shaft of the valve shutter, arranged at least partly in the box-shaped body with its own rotation axis orthogonal to the longitudinal axis;
  • kinematic system for connecting the pistons to the drive shaft, wherein the kinematic system is designed to turn the reciprocating translating motion of the pistons into reciprocating rotary motion of the drive shaft, and - means for adjusting, that is setting, the minimum distance between the pistons.
  • the adjusting means comprise at least one substantially wedge-shaped limit element, interposed between the pistons and movable along an adjusting axis orthogonal to both the longitudinal axis and rotation axis.
  • the limit element can be stopped in a plurality of stationary positions, selected during the installation or maintenance step, to define corresponding positions of minimum mutual distance between the pistons.
  • the limit element can be inserted between the pistons to define from time to time a new position of minimum distance between the pistons.
  • the actuator of the present invention can remain a long time in the end-position arrangement of the pistons without affecting the kinematic system.
  • the position of maximum insertion of the limit element corresponds to the maximum distance between the pistons in the allowable minimum mutual distance.
  • the position of minimum insertion of the limit element corresponds to a minimum distance between the pistons in the allowable minimum mutual distance.
  • the limit element is generally arrow- shaped.
  • the limit element is provided with at least two abutment surfaces both intended to contact a corresponding countercheck surface of one of the two pistons.
  • the abutment surfaces converge toward the adjusting axis.
  • the countercheck surface of the pistons is parallel to the corresponding abutment surface of the limit element, such as to move these elements in contact with an area as larger as possible.
  • the actuator comprises a regulator, accessible from the outside of the box-shaped body that has the function of allowing the precise adjustment of the stop position of the limit element along the adjusting axis.
  • the installer and the service man of the actuator arrange the limit element in the target position, corresponding to a new stop position of the approaching pistons, by operating the regulator.
  • the regulator comprises an adjusting screw engaging a threaded hole obtained through a wall of the box-shaped body. Then, the screw can be screwed and unscrewed through the box-shaped body. As a result, the screw end inserted in the box-shaped body can be brought near the inner wall of the body or moved away from it. Such a screw end is constrained to the limit element, meaning that is coupled thereto to push and pull it back in response to the screwing/ unscrewing of the screw itself.
  • the end of the adjusting screw is substantially mushroom - shaped and it is housed free to rotate in a seat having a complementary shape obtained in the limit element. This arrangement allows the screw to rotate about its own axis with respect to the limit element, without disengaging it.
  • the limit element comprises a center through eyelet wherein the drive shaft of the actuator is slidingly housed.
  • the limit element is planar and the associated lying plane is orthogonal to the drive shaft and substantially halves it. This arrangement allows shaping substantially symmetrically the kinematic system, as will be described hereinafter.
  • the lying plane of the limit element may intersect the drive shaft at different sections, for example on the upper or lower part of the kinematic system.
  • the kinematic system comprises at least one pinion keyed on the drive shaft, or obtained in a single piece on the latter, and a corresponding rack element integral with a pinion. More preferably there are two pinions, provided on the drive shaft on opposite sides with respect to the limit element. Each of the two pinions engages a corresponding rack element integral with a piston.
  • the rack elements are parallel to each other on opposite sides with respect to the drive shaft.
  • the kinematic system is of cam and follower type, generally known as scotch-yoke.
  • the drive shaft is combined with one or two inner cams wherein the followers combined with the pistons are slidingly housed.
  • the follower movement inside the respective cams causes the drive shaft rotation.
  • the kinematic system can also be reversed, that is the drive shaft can be provided with followers sliding in cams which are each combined with one of the pistons.
  • the box-shaped body comprises two ending walls, for example composed of flanges, through each of which an adjusting screw of the limit element of the pistons is inserted in the position of maximum mutual distance.
  • the kinematic system is of cams and followers type.
  • the actuator is shaped so as to be remote controlled, meaning that feeding of compressed air to the box-shaped body and the stop of feeding are preferably remote controlled by means of solenoid valves.
  • - figure 1 is a perspective view of a first actuator according to the present invention
  • - figure 2 is a partially phantom perspective view of a second actuator according to the present invention
  • FIG. 3 is a perspective view of the actuator shown in figure 2, wherein some elements are omitted for clarity purposes;
  • figure 7 is a partially phantom perspective view of the first actuator shown in figure 1;
  • FIG. 8 is a partially phantom perspective view of a third actuator according to the present invention.
  • a first actuator comprising a box-shaped body 2, substantially parallelepiped shaped, with flanges 3 and 4 closing its ends.
  • the box-shaped body 2 is provided with intakes or connectors (not shown) to be connected to compressed air lines.
  • the compressed air can be fed at different inner volumes of the box-shaped body 2.
  • the actuator 1 comprises a drive shaft 5 intended to be constrained to the activating shaft (not shown) of the shutter element of a shutoff valve of a hydraulic or pneumatic line.
  • the drive shaft is rotatable about the rotation axis Y-Y.
  • Figure 2 shows a second embodiment.
  • the upper part of a box-shaped body 2 has been omitted to visualize the inside of the actuator 1 comprising two pistons 6 and 7 opposed with respect to the drive shaft 5, having a polar symmetry with respect to the rotation axis Y-Y.
  • the pistons 6 and 7 are translatable along the longitudinal axis X-X of the box-shaped body 2, alternatively in both directions and always in opposite directions, that is to say approaching and moving away from each other.
  • the translation is caused by the thrust exerted onto the pistons 6 and 7 by the compressed air fed to the box-shaped body 2.
  • the air pressure increases on the inner faces 61 and 71 of the pistons 6 and 7, they translate away from each other toward the flanges 4 and 3, respectively.
  • At least one pinion 51 or a toothed surface is provided on the drive shaft.
  • the pistons 6 and 7 are provided with at least one rack element 63 and 73 engaging the pinion 51 to turn the reciprocating translating motion of the pistons 6 and 7 into reciprocating rotary motion of the drive shaft 5.
  • the shown actuator 1 comprises two pinions 51 and 52 obtained in the drive shaft 5 or keyed to the latter, along the axis Y-Y at different heights, that is to say on opposite sides with respect to the half of the shaft 5 itself.
  • the piston 6 comprises an upper rack element 63 engaging the upper pinion 51, and a lower rack element 64 engaging the lower pinion 52.
  • the piston 7 comprises an upper rack element 73 and a lower rack element (both not visible in figure 3) . This substantially symmetrical arrangement allows to prevent bending loads from being generated on the drive shaft 5.
  • a limit element 8 is housed in the box-shaped body 2, interposed between the pistons 6 and 7.
  • the limit element 8 has the function of defining the minimum mutual distance position of the approaching pistons 6 and 7 and therefore defining the maximum opening or maximum closing position of the valve controlled by the actuator 1.
  • the limit element 8 can translate along the adjusting axis Z-Z orthogonal to both the axis X-X and Y-Y, moreover intersecting them.
  • Figure 4 is a sectional plane view of the actuator 1 shown in figure 2 in a first arrangement, wherein the pistons 6 and 7 are at the maximum mutual distance, corresponding for example to the completely opened valve.
  • the end-position of the pistons is defined by the screws 10 and 11 that are screwed through the flange 4 and the flange
  • the limit element 8 is substantially wedge shaped, for example arrow shaped, and has two tilting and converging side surfaces 82 and 83, respectively facing the inner face of the piston 6 and the inner face of the piston 7, particularly facing respective countercheck surfaces 65,
  • the limit element 8 is provided with an eyelet 81 slidingly housing the drive shaft 5.
  • the countercheck surface 65 is parallel to the abutment surface 82 and the countercheck surface 75 is parallel to the abutment surface 83.
  • Figure 6 is only apparently similar to figure 5; actually a worker operated on the adjusting screw 9 to push the limit element 8 toward the drive shaft 5 to a new steady stop position. It's therefore a precise adjustment of the minimum distance position of the pistons 6 and 7 and accordingly of the corresponding position of the valve shutter element. A mutual sliding of the countercheck surface 65 on the abutment surface 82 and of the countercheck surface 75 on the abutment surface 83 occurs during the adjustment.
  • the screw 9 acts as a regulator of the stop position of the limit element 8.
  • the new center distance obtained between the pistons 6 and 7 is referred to as M2. Comparing figure 5 and 6 makes it obvious that M2 > Ml .
  • the limit element 8 can be moved back and forth along the axis Z-Z in any stop position according to the requirements.
  • the reference numeral 91 indicates the head of the adjusting screw 9, rotatably housed in a specific retaining seat 84 of the limit element 8.
  • the head 91 is general mushroom-shaped to prevent from accidentally disengaging with respect to the corresponding seat 84.
  • the limit element 8 is substantially planar and intercepts the drive shaft 5 at its center line, that is in the middle of the pinions 51 and 52.
  • Figure 7 shows an alternative embodiment where the limit element 8 is positioned above the pinion 51.
  • Figure 8 shows another embodiment, similar to the preceding one, wherein the kinematic system causing the rotation of the drive shaft 5 is known in the art as "Scotch-Yoke". It's substantially a cam and follower mechanism.
  • the drive shaft 5 is provided with a cam and the pistons with corresponding followers; the interaction between the piston followers and the cam causes the drive shaft 5 to rotate.
  • the compressed air intake in the box-shaped body 2 can be eventually remote controlled, according to known art.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Driven Valves (AREA)
  • Actuator (AREA)

Abstract

La présente invention se rapporte à un actionneur pneumatique (1) conçu pour commander la rotation de l'arbre d'actionnement d'une soupape d'arrêt. L'actionneur comprend un corps en forme de boîte (2) qui peut être alimenté avec de l'air comprimé, deux pistons opposés (6, 7) reçus dans le corps en forme de boîte, qui peuvent être déplacés dans des directions opposées en réponse à la force exercée par l'air comprimé, entre une position représentant une distance mutuelle maximale et une position représentant une distance mutuelle minimale, un arbre d'entraînement (5) qui peut être couplé à l'arbre d'actionnement du clapet, et un système cinématique qui raccorde les pistons à l'arbre d'entraînement. L'actionneur comprend au moins un élément de limitation sensiblement en forme de coin (8) intercalé entre les pistons et mobile dans une pluralité de positions stationnaires pour définir les positions correspondantes de la distance mutuelle minimale des pistons, c'est-à-dire pour ajuster la position finale.
PCT/IB2013/052874 2012-05-04 2013-04-11 Actionneur pneumatique pourvu d'une position finale ajustable WO2013164716A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000078A ITBS20120078A1 (it) 2012-05-04 2012-05-04 Attuatore pneumatico provvisto di finecorsa regolabile
ITBS2012A000078 2012-05-04

Publications (1)

Publication Number Publication Date
WO2013164716A1 true WO2013164716A1 (fr) 2013-11-07

Family

ID=46178616

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2013/052874 WO2013164716A1 (fr) 2012-05-04 2013-04-11 Actionneur pneumatique pourvu d'une position finale ajustable

Country Status (2)

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IT (1) ITBS20120078A1 (fr)
WO (1) WO2013164716A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007057927A1 (fr) * 2005-11-15 2007-05-24 Actuatech S.R.L. Actionneur pneumatique avec regulateur de course
WO2010063515A1 (fr) * 2008-12-04 2010-06-10 Air Torque S.P.A. Actionneur commandé par fluide, pourvu d'un moyen amélioré de réglage de la limite de course
KR20110125364A (ko) 2010-05-13 2011-11-21 영남대학교 산학협력단 공압작동기
WO2011158222A2 (fr) * 2010-06-17 2011-12-22 Bray International, Inc. Engagement multi-dent dans un piston actionneur

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007057927A1 (fr) * 2005-11-15 2007-05-24 Actuatech S.R.L. Actionneur pneumatique avec regulateur de course
WO2010063515A1 (fr) * 2008-12-04 2010-06-10 Air Torque S.P.A. Actionneur commandé par fluide, pourvu d'un moyen amélioré de réglage de la limite de course
KR20110125364A (ko) 2010-05-13 2011-11-21 영남대학교 산학협력단 공압작동기
WO2011158222A2 (fr) * 2010-06-17 2011-12-22 Bray International, Inc. Engagement multi-dent dans un piston actionneur

Also Published As

Publication number Publication date
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