UNIT FOR FASTENING PUMP WHEEL ON SHAFT Russian patent published in 2007 - IPC F04D29/20 

FIELD: nuclear power stations.

SUBSTANCE: invention relates to vane pumps and it can be used in main circulation pumping units of first coolant circuit. Proposed unit has pressure ring arranged on pump shaft, inserts limiting downwards displacement of ring installed in groove on end of shaft, removable stop enclosing the insert and pressure ring, screw joint of removable stop and pressure ring to provide axial tightening of pump wheel. Removable stop encloses pump shaft by bottom with minimum possible radial clearance. Unit is furnished with split ring whose lower part is enclosed by step of inner surface of removable stop. Upper parts of inserts are enclosed by step on inner surface of pressure ring whose length is less than thickness of split ring. Part of threaded holes of pressure ring is designed for turning in studs for thrusting against split ring. Each insert is made in form of part of cylindrical bushing with radial thickness less than radial distance from pump shaft to any body of stud or screw.

EFFECT: possibility of demounting of removable stop and pressure ring without damage.

2 dwg