A variable stator vane arrangement includes a casing, a plurality of stator vanes, at least one control ring, a plurality of connecting rods and a crankshaft. The stator vanes are circumferentially spaced apart in the casing and the plurality of stator vanes are rotatably mounted in the casing. Each
A variable stator vane arrangement includes a casing, a plurality of stator vanes, at least one control ring, a plurality of connecting rods and a crankshaft. The stator vanes are circumferentially spaced apart in the casing and the plurality of stator vanes are rotatably mounted in the casing. Each control ring is rotatably mounted on the casing and each stator vane is connected to an associated control ring. The crankshaft, rotatably mounted on the casing, is drivingly connected to each control ring and has an axis and a plurality of clevizes. Each connecting rod connects one of the clevizes on the crankshaft to a respective one of the control rings. At least one clevis is adjustably secured to the crankshaft by an adjusting mechanism and the adjusting mechanism is used to select the radial and/or angular position of at least one clevis relative to the axis of the crankshaft.
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1. A variable stator vane arrangement comprising a casing, a plurality of stages of variable stator vanes, a plurality of connecting rods and a crankshaft, each stage of variable stator vanes comprises a plurality of stator vanes, a control ring and a plurality of operating levers, each operating le
1. A variable stator vane arrangement comprising a casing, a plurality of stages of variable stator vanes, a plurality of connecting rods and a crankshaft, each stage of variable stator vanes comprises a plurality of stator vanes, a control ring and a plurality of operating levers, each operating lever connects the control ring to a respective one of the stator vanes,the stator vanes in each stage of variable stator vanes are circumferentially spaced apart in the casing, the stator vanes in each stage of variable stator vanes are rotatably mounted in the casing,the crankshaft is rotatably mounted on the casing, the crankshaft has an axis and a plurality of clevises,each connecting rod connects one of the plurality of clevises on the crankshaft to a respective one of the control rings,wherein at least one clevis of the plurality of clevises is movably mounted on the crankshaft such that it is movable radially relative to the axis of the crankshaft and/or such that it is movable angularly relative to the axis of the crankshaft, the at least one clevis is adjustably secured to the crankshaft by an adjusting mechanism, the adjusting mechanism is arranged to select the radial position of the at least one clevis relative to the axis of the crankshaft and/or the angular position of the at least one clevis relative to the axis of the crankshaft, the adjusting mechanism including a releasable lock to lock the at least one clevis in a selected radial position and/or a selected angular position, andwherein the releasable lock is able to lock the at least one clevis in each one of a plurality of radial positions and/or angular positions. 2. The variable stator vane arrangement as claimed in claim 1, wherein the at least one clevis is radially slidably mounted on the crankshaft, rotatably mounted on the crankshaft or eccentrically rotatably mounted on the crankshaft. 3. The variable stator vane arrangement as claimed in claim 1 wherein the plurality of clevises are adjustably mounted on the crankshaft. 4. The variable stator vane arrangement as claimed in claim 1, wherein the variable stator vane arrangement is selected from the group consisting of a compressor variable stator arrangement and a turbine variable stator vane arrangement. 5. The variable stator vane arrangement as claimed in claim 1, wherein the variable stator vane arrangement is selected from the group consisting of a variable stator vane arrangement for a gas turbine engine and a variable stator vane arrangement for a turbomachine. 6. A variable stator vane arrangement comprising a casing, a plurality of stages of variable stator vanes, a plurality of connecting rods and a crankshaft, each stage of variable stator vanes comprises a plurality of stator vanes, a control ring and a plurality of operating levers, each operating lever connects the control ring to a respective one of the stator vanes,the stator vanes in each stage of variable stator vanes are circumferentially spaced apart in the casing, the stator vanes in each stage of variable stator vanes are rotatably mounted in the casing,the crankshaft is rotatably mounted on the casing, the crankshaft has an axis and a plurality of clevises,each connecting rod connects one of the plurality of clevises on the crankshaft to a respective one of the control rings,wherein at least one clevis of the plurality of clevises is movably mounted on the crankshaft such that it is movable radially relative to the axis of the crankshaft and/or such that it is movable angularly relative to the axis of the crankshaft, the at least one clevis is adjustably secured to the crankshaft by an adjusting mechanism, the adjusting mechanism is arranged to select the radial position of the at least one clevis relative to the axis of the crankshaft and/or the angular position of the at least one clevis relative to the axis of the crankshaft, the adjusting mechanism including a releasable lock to lock the at least one clevis in a selected radial position and/or a selected angular position, andwherein the adjusting mechanism comprises two wedges and the wedges are movable in a plane which is perpendicular to the axis of the crankshaft and in a direction perpendicular to a radial direction. 7. The variable stator vane arrangement as claimed in claim 6, wherein the at least one clevis is secured to the crankshaft by a fastener, the fastener extends through an aperture in the crankshaft, the aperture is arranged radially with respect to the axis of the crankshaft, the clevis has two angled wedging surfaces and both of the wedges has a wedging surface arranged to abut a corresponding wedging surface on the clevis. 8. The variable stator vane arrangement as claimed in claim 7, wherein the fastener comprises a bolt and the clevis has a threaded aperture to receive the bolt. 9. The variable stator vane arrangement as claimed in claim wherein the aperture is a slot extending transversely of the crankshaft. 10. The variable stator vane arrangement as claimed in claim 6, wherein each wedge is arranged on at least one threaded stud extending from the crankshaft. 11. The variable stator vane arrangement as claimed in claim 10, wherein each wedge is arranged on two threaded studs extending from the crankshaft. 12. The variable stator vane arrangement as claimed in claim 6, wherein the wedging surfaces of the clevis are arranged to intersect radially inwardly of a radially inner surface of the clevis and the wedging surfaces of the wedges are arranged parallel to the wedging surfaces of the clevis. 13. The variable stator vane arrangement as claimed in claim 6, wherein the plurality of clevises are adjustably mounted on the crankshaft. 14. The variable stator vane arrangement as claimed in claim 6, wherein the variable stator vane arrangement is selected from the group consisting of a compressor variable stator arrangement and a turbine variable stator vane arrangement. 15. A variable stator vane arrangement comprising a casing, a plurality of stages of variable stator vanes, a plurality of connecting rods and a crankshaft, each stage of variable stator vanes comprises a plurality of stator vanes, a control ring and a plurality of operating levers, each operating lever connects the control ring to a respective one of the stator vanes,the stator vanes in each stage of variable stator vanes are circumferentially spaced apart in the casing, the stator vanes in each stage of variable stator vanes are rotatably mounted in the casing,the crankshaft is rotatably mounted on the casing, the crankshaft has an axis and a plurality of clevises,each connecting rod connects one of the plurality of clevises on the crankshaft to a respective one of the control rings,wherein at least one clevis of the plurality of clevises is movably mounted on the crankshaft such that it is movable radially relative to the axis of the crankshaft and/or such that it is movable angularly relative to the axis of the crankshaft, the at least one clevis is adjustably secured to the crankshaft by an adjusting mechanism, the adjusting mechanism is arranged to select the radial position of the at least one clevis relative to the axis of the crankshaft and/or the angular position of the at least one clevis relative to the axis of the crankshaft, the adjusting mechanism including a releasable lock to lock the at least one clevis in a selected radial position and/or a selected angular position,wherein the at least one clevis is radially slidably mounted on the crankshaft, rotatably mounted on the crankshaft or eccentrically rotatably mounted on the crankshaft, andwherein the adjusting mechanism comprises a plurality of circumferentially spaced apertures in an end of the crankshaft, a locating pin is arranged in a selected one of the apertures in the end of the crankshaft, a driving plate is rotatably mounted on the crankshaft about the axis of the crankshaft, the driving plate has a plurality of circumferentially spaced apertures in at least one surface of the plate, the locating pin is arranged in a selected one of the apertures in the driving plate, a crank arm has first and second radially aligned slots and the clevis, the crank arm is secured to the end of the crankshaft by a first fastener positioned in the first slot and the crank arm is secured to the driving plate by a second fastener positioned in the second slot. 16. The variable stator vane arrangement as claimed in claim 10, wherein the variable stator vane arrangement is selected from the group consisting of a compressor variable stator arrangement and a turbine variable stator vane arrangement. 17. A variable stator vane arrangement comprising a casing, a plurality of stages of variable stator vanes, a plurality of connecting rods and a crankshaft, each stage of variable stator vanes comprises a plurality of stator vanes, a control ring and a plurality of operating levers, each operating lever connects the control ring to a respective one of the stator vanes,the stator vanes in each stage of variable stator vanes are circumferentially spaced apart in the casing, the stator vanes in each stage of variable stator vanes are rotatably mounted in the casing,the crankshaft is rotatably mounted on the casing, the crankshaft has an axis and a plurality of clevises,each connecting rod connects one of the plurality of clevises on the crankshaft to a respective one of the control rings,wherein at least one clevis of the plurality of clevises is movably mounted on the crankshaft such that it is movable radially relative to the axis of the crankshaft and/or such that it is movable angularly relative to the axis of the crankshaft, the at least one clevis is adjustably secured to the crankshaft by an adjusting mechanism, the adjusting mechanism is arranged to select the radial position of the at least one clevis relative to the axis of the crankshaft and/or the angular position of the at least one clevis relative to the axis of the crankshaft, the adjusting mechanism including a releasable lock to lock the at least one clevis in a selected radial position and/or a selected angular position,wherein the at least one clevis is radially slidably mounted on the crankshaft, rotatably mounted on the crankshaft or eccentrically rotatably mounted on the crankshaft, andwherein the adjusting mechanism comprises a plurality of circumferentially spaced apertures in an end of the crankshaft, a locating pin is arranged in a selected one of the apertures in the end of the crankshaft, a ring has an eccentric aperture, the ring is rotatably mounted on the end of the crankshaft, the ring is located in a recess in the clevis, the base of the recess has a plurality of circumferentially spaced slots, the slots extend radially, the locating pin is arranged in a selected one of the slots in the base of the recess, the clevis is secured to the end of the crankshaft by a fastener. 18. The variable stator vane arrangement as claimed in claim 17, wherein the variable stator vane arrangement is selected from the group consisting of a compressor variable stator arrangement and a turbine variable stator vane arrangement. 19. A variable stator vane arrangement crankshaft, the crankshaft having an axis and a plurality of clevises, wherein at least one clevis is movably mounted on the crankshaft such that it is movable radially relative to the axis of the crankshaft and/or such that it is movable angularly relative to the axis of the crankshaft, the at least one clevis is adjustably secured to the crankshaft by an adjusting mechanism, the adjusting mechanism is arranged to select the radial position of the at least one clevis relative to the axis of the crankshaft and/or the angular position of the at least one clevis relative to the axis of the crankshaft, the adjusting mechanism including a releasable lock to lock the at least one clevis in a selected radial position and/or a selected angular position, the releasable lock being able to lock the at least one clevis in each one of a plurality of radial positions and/or angular positions. 20. A method of operating a variable stator vane arrangement, the variable stator vane arrangement comprising a casing, a plurality of stages of variable stator vanes, a plurality of connecting rods and a crankshaft, each stage of variable stator vanes comprises a plurality of stator vanes, a control ring and a plurality of operating levers, each operating lever connects the control ring to a respective one of the stator vanes,the stator vanes in each stage of variable stator vanes are circumferentially spaced apart in the casing, the stator vanes in each stage of variable stator vanes are rotatably mounted in the casing,the crankshaft is rotatably mounted on the casing, the crankshaft has an axis and a plurality of clevises,each connecting rod connects one of the clevises on the crankshaft to a respective one of the control rings,wherein at least one clevis is movably mounted on the crankshaft such that it is movable radially relative to the axis of the crankshaft and/or such that it is movable angularly relative to the axis of the crankshaft, the at least one clevis is adjustably secured to the crankshaft by an adjusting mechanism, the adjusting mechanism is arranged to select the radial position of the at least one clevis relative to the axis of the crankshaft and/or the angular position of the at least one clevis relative to the axis of the crankshaft, the adjusting mechanism including a releasable lock to lock the at least one clevis in a selected radial position and/or a selected angular position,the method comprising positioning the at least one clevis at a first radial position relative to an axis of the crankshaft and a first angular position relative to an axis of the crankshaft for a first variable stator vane arrangement schedule and positioning the at least one clevis at a second radial position relative to an axis of the crankshaft and/or a second angular position relative to an axis of the crankshaft for a second variable stator vane arrangement schedule.
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이 특허에 인용된 특허 (4)
Faltys, Jan, Control mechanism for the stator vanes of an axial turbine device.
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