SEAL OF BLADE OF IMPELLER OF PROPELLER HYDRAULIC TURBINE Russian patent published in 2003 - IPC

FIELD: hydraulic machine building. SUBSTANCE: seal of blade of impeller of propeller hydraulic turbine has outer and inner pressure rings, elastic cups with circular sections bent in opposite directions, embracing sealed surface of flange of blade and separated one from another by rigid separating ring set immobile on body of bushing of impeller. Separating ring is fitted with guiding bushings and is biconvex in zone of cup contact with surfaces of pressure rings beveled to different sides. EFFECT: enhanced operational reliability of seal thanks to considerable reduction of probability of leaks of oil and water, prolonged overhaul period. 4 cl, 2 dwg