Runner blade servo system for turbines

Claim 1

IN A KAPLAN TYPE TURBINE INCLUDING ADJUSTABLE WICKET GATES AND WICKET GATE OPERATING MECHANISM FOR CHANGING THE SETTING OF THE WICKET GATES TO CONTROL THE FLOW OF WATER TO THE RUNNER BLADES OF THE TURBINE, A ROTATING ASSEMBLY INCLUDING A ROTATABLE SHAFT, A CASING RIGIDLY SECURED TO SAID SHAFT, A PASSAGEWAY EXTENDING ALONG THE LONGITUDINAL AXIS OF THE SHAFT COMMUNICATING WITH THE CASING, RUNNER BLADES JOURNALLED IN SAID CASING FOR ROTATION ABOUT AXES RADIAL TO THE CASING, A PISTON OPERATIVELY CONNECTED TO THE BLADES FOR CHANGING AND CONTROLLING THE PITCH SETTING OF THE BLADES, A VALVE FOR CONTROLLING THE OPERATION OF SAID PISTON, THE LONGITUDINAL AXIS OF SAID VALVE LYING ON THE LONGITUDINAL AXIS OF THE CASING AND SHAFT, A CONTROL ROD EXTENDING THROUGH SAID PASSAGEWAY FOR CONTROLLING THE POSITION OF SAID VALVE, THE CASING COMPRISING AN OIL RESERVOIR, AN ELECTRIC MOTOR IN SAID CASING, CONTROL MEANS FOR SAID ELECTRIC MOTOR EXTENDING THROUGH SAID PASSAGEWAY, A PUMP DRIVEN BY SAID MOTOR, THE INLET OF SAID PUMP COMMUNICATING WITH THE RESERVOIR, THE OUTLET OF THE PUMP COMMUNICATING WITH THE VALVE WHEREBY SAID PUMP MAY BE DRIVEN TO MOVE SAID PISTON AND ALTER THE RUNNER BLADE SETTING WHEN CHANGES IN THE WICKET GATE SETTING MOVE THE CONTROL ROD TO REPOSITION SAID VALVE.