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WO2008091202A1 - Mécanisme d'influence devant être utilisé dans une soupape d'arrêt et/ou une soupape de régulation - Google Patents

Mécanisme d'influence devant être utilisé dans une soupape d'arrêt et/ou une soupape de régulation Download PDF

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Publication number
WO2008091202A1
WO2008091202A1 PCT/SE2008/000067 SE2008000067W WO2008091202A1 WO 2008091202 A1 WO2008091202 A1 WO 2008091202A1 SE 2008000067 W SE2008000067 W SE 2008000067W WO 2008091202 A1 WO2008091202 A1 WO 2008091202A1
Authority
WO
WIPO (PCT)
Prior art keywords
spindle
spring
influencing mechanism
valve
anyone
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.)
Ceased
Application number
PCT/SE2008/000067
Other languages
English (en)
Inventor
Torbjörn Lövgren
Peter Hansson
Mathias Andersson
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.)
SKF AB
Original Assignee
SKF AB
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 SKF AB filed Critical SKF AB
Publication of WO2008091202A1 publication Critical patent/WO2008091202A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • F16K31/44—Mechanical actuating means
    • F16K31/56—Mechanical actuating means without stable intermediate position, e.g. with snap action
    • 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
    • F16K31/003—Actuating devices; Operating means; Releasing devices operated without a stable intermediate position, e.g. with snap action

Definitions

  • the present invention refers to an influencing mechanism to be used in a stop valve and/or regulating valve, which mechanism incorporates a spring.
  • Stop and/or regulating valves of the type incorporating a spindle and a valve body, which is movable between a position in which the valve body closes a passage, a position in which the passage is fully open, and possibly intermediate positions for giving different areas of the passage, are well known in different fields, where a flow of fluid shall be controlled.
  • a common design of such a valve incorporates a spindle, associated with a spring, and being connected to a hydraulic piston for moving the spindle in order to cause the valve body to open or close the passage.
  • the spring is arranged to perform a trip function in case of interruption of supply of pressurized hydraulic fluid, for causing the valve to be closed immediately.
  • the purpose of the present invention is to propose an influencing mechanism to be used in a stop valve and/or regulating valve, of the above described type, by which influencing mechanism the above drawbacks have been eliminated, and which gives a satisfactory and reliable function, and for achieving this the influencing mechanism is characterized by the features defined in the accompanying claim 1.
  • the invention will be further described with reference to non- limiting embodiments of an influencing mechanism for a valve illustrated in the accompanying drawings.
  • Fig. 1 illustrates schematically and in cross section a first embodiment of an influencing mechanism according to the invention.
  • Fig. 2 is a schematic cross section of a second embodiment of an influencing mechanism according to the invention.
  • Fig. 3 is a schematic presentation of a first embodiment of the interconnection between the influencing mechanism according to the invention and a spindle.
  • Fig. 4 is a schematic presentation of a second embodiment of the interconnection between the influencing mechanism according to the invention and a spindle.
  • Fig. 1 shows a cross section of a portion of an influencing mechanism incorporating a spindle 1, supported in a not further shown manner for being axially movable in order to cause a valve body to move between a first end position fully opening a valve passage and a second end position fully closing the valve passage.
  • the end portion of the spindle 1 is connected to a plate 2, which by means of a spring 3 is urged in a direction towards one of said end positions, e.g. for closing the valve body.
  • the plate 2 is further connected to an actuator 4, which via a shaft 5 is driven by an electric motor 6, connected to a gearbox 7.
  • An output shaft 8 from the gearbox 7 is coupled to the shaft 5 via a magnetic coupling 9.
  • the shaft 5 is at least along a portion of its envelope surface provided with an outer helical groove (not further shown), and a nut 10 is arranged around the grooved portion of the shaft 5, which nut is provided with an internal corresponding groove, arranged to cooperate with the groove in the shaft, and thereby together with the shaft 5, forming said actuator 4.
  • the grooves in shaft 5 and nut 10 can either contact each other directly or via a series of balls or rollers forming together with shaft 5 and nut 10 a ball or screw mechanism.
  • the nut 10 When the motor 6 operates, thereby rotating the shaft 5 via the gearbox 7 and the magnetic coupling 9, the nut 10 will move in the axial direction of the shaft 5.
  • the nut 10 is in contact with a cup 11 being rigidly connected to the plate 2, and when the shaft 5 by the motor 6, via the gearbox, is driven in one rotational direction, the nut 10 is arranged to move in a direction to compress the spring 3, thereby via the plate 2 pulling the spindle 1 to one of its end positions, preferably but not necessarily to the end position in which the valve passage is open.
  • the compressed spring 3 will expand in a substantially un-constrained manner whereby the nut 10 will rotate freely around the grooved part of the shaft 5, thereby moving the spindle 1 to the second position of the spindle 1.
  • the magnetic coupling 9 can also be provided in the form of a solenoid.
  • damping means 12 preferably mechanical damping means, in connection to the plate 2.
  • the influencing mechanism as schematically illustrated in Fig. 1 and described in connection thereto, can be used for controlling a stop valve, movable between a first opening end position and a second closing end position, but under influence of the actuator, it can also be used for operating a regulating valve, whereby the actuator can be driven in opposite directions for holding the spindle 1 in a number of intermediate positions between said first and second end positions.
  • the influencing mechanism according to Fig. 1 is very compact, as the spring 3 is arranged around the shaft 5 and the actuator 4, and it is assembled inside a cup-formed housing 13. Due to this compact design, it is possible to obtain very short opening and closing times, which can be so low as tenths of seconds. However for such short operating times the maximum stroke of the mechanism is limited, as the travel of the nut 10 along the grooved shaft 5, will increase the operating time with the length of the spindle.
  • Fig. 2 is schematically illustrated an alternative embodiment of the influencing mechanism according to the invention, by means of which it is possible to obtain acceptable operating time also with substantially longer spindle strokes.
  • an electric motor 14 which via a transmission belt 15 drives an output shaft 16, coupled via an electromagnetic coupling/catch 17 to a grooved shaft 18 and together with a nut 19 forming an actuator.
  • the nut 19 is connected to a sleeve 20 enclosing the shaft 18, and ending with a rod end 21.
  • This rod end is via a not shown lever connected to a valve spindle (not shown), and a compression spring (not shown) is arranged to act upon the valve spindle in a manner corresponding to that performed by the spring 3 in the embodiment according to Fig. 1.
  • Hg. 3 is schematically illustrated a first type of interconnection between the influencing mechanism according to the invention and a spindle.
  • the spindle 22 is connected to an electric motor 23 with gearbox via an electromagnetic coupling/catch 24 and with an actuator mechanism 25 coupled to the spindle 22.
  • the spindle 22 which can be compared to the embodiment according to Rg.
  • the compressed spring 26 when the electromagnetic coupling/catch 24 is de-energized, the compressed spring 26 will expand, thereby via the rotating nut of the actuator mechanism 25 allowing the spindle 22 to move from one end position (or an intermediate position) to the other end-position.
  • the force of the spring 26 will cause a part of the electromagnetic coupling/catch 24, the shaft and the nut of the actuator mechanism 25 and the spindle 22 to move.
  • the rotation of the nut incorporated in the actuator mechanism 25 will be determining for the time that is required for moving the spindle to its alternative end position.
  • a second embodiment of the interconnection between the influencing mechanism according to the invention and a spindle can be preferable, and such an embodiment is schematically illustrated in Fig. 4.
  • the electric motor 23 drives an actuator mechanism 25, which via at least one pivotable catch 27 is arranged to catch the spindle 22, thus that the spring 26 can be compressed when the motor is operating.
  • the at least one pivotable catch 27, can be pivoted by actuation of a releasing member 28, e.g. a solenoid.
  • a releasing member 28 e.g. a solenoid.
  • the spring 26 momentarily will expand in a non- constrained manner, moving thereby only the spindle 22 and not being delayed by the rotational speed of the actuator.
  • the influencing mechanism may have a portion between the spindle (1, 22) and the releasable holding means that has a lower strength such that the portion breaks at a predetermined force of impact between the spindle (1, 22) and a stopping means near the second end position.
  • the predetermined force needed to break the portion is lower than the strength of the other parts of the influencing mechanism.
  • the stopping means is at the second end position.
  • the portion has a zone of rupture comprising any of an attenuation, a brittle screw, a brittle nail, a brittle rivet, a material of lower strength, or a groove.
  • the influencing mechanism can be used with favourable result for a plurality of different applications.
  • An influencing mechanism according to the invention can also be used for controlling the pitch of the blades of wind turbines, and as compared to the conventional control means using hydraulics, it will give better response time to follow load variations on the turbine, no fire risks caused by bursting or leaking oil pipes and less maintenance and down time.
  • That the releasable holding means is fluid-free does not exclude oil, grease or other lubricants for lubrication purposes of the influencing mechanism.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Mechanically-Actuated Valves (AREA)

Abstract

L'invention concerne un mécanisme d'influence devant être utilisé dans une soupape d'arrêt et/ou une soupape de régulation comprenant un ressort (3, 26) et des moyens de retenue libérables pour commander le mouvement d'une broche (1, 22), associés à la soupape dans une première position d'extrémité, où le ressort (3, 26) est dans un état comprimé. Les moyens de tenue libérables sont électromécaniques et exempts de fluide, et sont agencés pour amener le ressort à s'étendre dans un état non comprimé d'une façon limitée, commandée, pour amener la broche (1, 22) à se déplacer d'une façon commandée à une seconde position d'extrémité, et sinon pour libérer le ressort, lorsqu' il est dans son état comprimé, pour lui permettre de s'étendre d'une façon non limitée dans un état non comprimé, libérant ainsi l'énergie cinétique stockée dans le ressort dans son état comprimé pour amener la broche à se déplacer d'une façon non limitée à la seconde position.
PCT/SE2008/000067 2007-01-25 2008-01-25 Mécanisme d'influence devant être utilisé dans une soupape d'arrêt et/ou une soupape de régulation Ceased WO2008091202A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0700188-6 2007-01-25
SE0700188 2007-01-25

Publications (1)

Publication Number Publication Date
WO2008091202A1 true WO2008091202A1 (fr) 2008-07-31

Family

ID=39644712

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2008/000067 Ceased WO2008091202A1 (fr) 2007-01-25 2008-01-25 Mécanisme d'influence devant être utilisé dans une soupape d'arrêt et/ou une soupape de régulation

Country Status (1)

Country Link
WO (1) WO2008091202A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11585457B2 (en) * 2018-01-11 2023-02-21 Voith Patent Gmbh Valve drive with snap function

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004065832A1 (fr) * 2003-01-20 2004-08-05 Danfoss A/S Actionneur commande par un moteur, soupape, procede et application associes

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004065832A1 (fr) * 2003-01-20 2004-08-05 Danfoss A/S Actionneur commande par un moteur, soupape, procede et application associes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11585457B2 (en) * 2018-01-11 2023-02-21 Voith Patent Gmbh Valve drive with snap function

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