Patent ID: 8192164
Filing Date: 2012-06-05
Classification: F03B,F05B,Y02E

Abstract:
1. A turbine runner of the Kaplan type, with adjustable runner blades mounted to a runner hub which is mounted to a turbine shaft, where the runner blades are adjustable by a hydraulically operated servomotor, which is mounted on a piston rod in the runner hub, the improvement comprising a collecting bin being provided, in which hydraulic liquid emerging between the piston rod and a seal of the servomotor is collected, the collecting bin being arranged around the free end of the piston rod and being rigidly connected with the servomotor and moving with the latter, a delivery pipe being provided and one end of the delivery pipe discharging into a pump volume formed between a movable collecting bin and the fixed piston rod and the actuation movement of the servomotor reducing and increasing the pump volume and thus hydraulic liquid being conveyed from the collecting bin into the delivery pipe.