Apparatus for adjusting stator blades
First Claim
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1. In combination with a multi-stage axial flow turbomachine having a casing and a plurality of stages of adjustable stator blades mounted in said casing about a longitudinal axis;
- an apparatus for adjusting said stator blades of each stage comprising a plurality of axially movable adjusting rings rotatably mounted in concentric relation about said axis, each adjusting ring being mounted adjacent a respective stator stage;
a plurality of levers connecting each adjusting ring to each blade of an adjacent stator stage; and
a plurality of resilient twistable strips secured across and to said rings and pivotally mounted at one end on said casing whereby upon rotation of said one ring, said rings simultaneously rotate and move axially of said axis to turn said blades of successive stages in a linear pattern while said strips are subjected to twisting.
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Abstract
The adjustably mounted stator blades are movable in a linear manner by means of adjusting rings which are both rotatable about the axis of the turbomachine and slidable longitudinally, i.e. axially, of the turbomachine. The adjusting rings are interconnected by resilient twistable strips which are each anchored in a pivotal manner on the stator blade support. The adjusting rings are driven by servo pistons which are connected to one of the adjusting rings.
20 Citations
6 Claims
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1. In combination with a multi-stage axial flow turbomachine having a casing and a plurality of stages of adjustable stator blades mounted in said casing about a longitudinal axis;
- an apparatus for adjusting said stator blades of each stage comprising a plurality of axially movable adjusting rings rotatably mounted in concentric relation about said axis, each adjusting ring being mounted adjacent a respective stator stage;
a plurality of levers connecting each adjusting ring to each blade of an adjacent stator stage; and
a plurality of resilient twistable strips secured across and to said rings and pivotally mounted at one end on said casing whereby upon rotation of said one ring, said rings simultaneously rotate and move axially of said axis to turn said blades of successive stages in a linear pattern while said strips are subjected to twisting.
- an apparatus for adjusting said stator blades of each stage comprising a plurality of axially movable adjusting rings rotatably mounted in concentric relation about said axis, each adjusting ring being mounted adjacent a respective stator stage;
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2. The combination as set forth in claim 1 which further comprises means secured to at least one ring for rotating said one ring and for rotating the other rings coupled thereto over said strips.
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3. The combination as set forth in claim 1 wherein said strips are secured to a support collar floatingly disposed between two of said adjusting rings to limit flexing of said strips.
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4. The combination as set forth in claim 1 wherein said strips are thin spring steel plates.
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5. The combination as set forth in claim 1 wherein said levers are circumferentially spaced about said adjusting rings.
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6. The combination as set forth in claim 1 comprising three of said strips.
Specification
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Current AssigneeABB Stal AB
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Original AssigneeFerdinand Zerlauth
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InventorsZerlauth, Ferdinand
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Primary Examiner(s)Raduazo, Henry F.
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Application NumberUS05/413,313Time in Patent Office609 DaysField of Search415/147,149,150,151,160,161US Class Current415/149.4CPC Class CodesF01D 17/162 for axial flow, i.e. the va...
