PRESSURISED LOW-NOISE PUMP Russian patent published in 2011 - IPC F04D13/06 F04D29/66 

FIELD: engines and pumps.

SUBSTANCE: pump consists of rotor, at console of which there attached is an impeller 10, screw 8, pump diffuser 11, casing 1 with integrated electric engine stator 2. Rotary part 5 of electric engine is attached at the shaft 3 between plain bearings 4. Input and output ducts 6, 14 are located along pump axis. Pump shaft 3 is hollow and acts as supply duct to impeller 10. Impeller 10 has a collar 15 that creates throttling gap 16 of hydraulic balancing device together with pump diffuser 11. Bearing plates 17, 18 are arranged at both sides of impeller 10. Rotor side play considerably exceed working gap 16 in bearing plate.

EFFECT: reduction of noise and vibration level, improvement of pump navigation characteristics.

2 cl, 2 dwg