Variable vane position adjuster

A turbine vane adjustment and actuation system for calibrating the nozzle/throat width dimensions between adjacent angularly adjustable nozzle vanes in a nozzle vane ring assembly and for controlling rotation of the individual vanes following calibration thereof comprising:

• a turbine case, a vane stem extending outwardly of a turbine case, a motion converting means connected to said vane stem including an adjustment sleeve operative for concurrent rotation with said stem and for relative axial movement of said sleeve relative to said vane stem, an actuator arm for rotating each of said vanes following calibration thereof, means for connecting said actuator arm to said sleeve to cause angular positioning of said actuator arm to be directly transmitted to each of said vanes following calibration thereof, means including calibration adjustment operative to axially position said sleeve on said vane stem to rotate said vane stem relative to said actuator arm upon relative axial movement of said sleeve as produced by said calibration adjustment means whereby said vane stem can be prepositioned without moving said actuator arm so as to calibrate throat clearances between adjacent nozzle vanes thereby to pre-establish a desired nozzle/throat flow area for maintaining a desired operating turbine nozzle performance during its control during subsequent angular positioning of said vanes by said actuator arms.

A turbine vane adjustment and actuation system for calibrating the nozzle/throat width dimensions between adjacent angularly adjustable nozzle vanes in a nozzle vane ring assembly and for controlling conjoint rotation of the individual vanes following calibration thereof comprising:

• a turbine case, a vane stem extending outwardly of said tubrine case, a motion converting sleeve surrounding said vane stem, first coacting means coupling said sleeve to said vane stem for concurrent rotation of said sleeve and said stem and for relative axial movement of said sleeve relative to said vane stem, an actuator arm for rotating each of said vanes following calibration thereof, means for connecting said actuator arm to said sleeve to cause angular positioning of said actuator arm to be directly transmitted to each of said vanes following calibration thereof, a calibration adjustment means accessible exteriorly of said turbine case and operative to axially position said sleeve on said vane stem, and second coacting means on said sleeve and said actuator arm responsive to the axial position of said sleeve on said vane stem to rotate said vane stem relative to said actuator arm upon relative axial movement of said sleeve produced by said calibration adjustment means whereby said vane stem can be prepositioned so as to calibrate throat width clearances between adjacent nozzle vanes thereby to pre-establish a desired nozzle/throat flow area for maintaining a desired turbine nozzle performance during its control during subsequent angular positioning of said vanes by said actuator arms.