PUMPING UNIT Russian patent published in 2006 - IPC F04D29/04 F04D29/60 

FIELD: structural units of vertical impeller pumps for operation at nuclear power stations in main circulating pumping units of first coolant loop of nuclear plants.

SUBSTANCE: proposed pumping unit includes impeller pump with vertical shaft whose lower trunnion engageable with radial sliding bearing is formed by bush fitted on pump shaft on two cones. Upper cone is split in construction. Pumping unit is provided with band on inner surface of bush. Mechanism for axial tightening of bush is provided with members forming bayonet joint. Provision is made for avoidance of misalignment of pump shaft and bush forming the trunnion in zone of lower radial sliding bearing and avoidance of effect of mounting and tightening the bush on relative position of engageable rotor and stator members of pump shaft end seals.

EFFECT: enhanced reliability.

2 cl, 4 dwg