VERTICAL CHEMICAL ELECTRICALLY DRIVEN PUMP WITH EXPOSED IMPELLER AND METHOD OF TRANSFER OF CHEMICALLY AGGRESSIVE FLUIDS Russian patent published in 2014 - IPC F04D7/02 F04D29/08 F04D29/62 F04D29/22 

FIELD: engines and pumps.

SUBSTANCE: proposed pump unit comprises rotary motor, adaptor with power coupling and rotary semi-submersible pump. Composite pump housing comprises running section housing arranged above thrust plate and suspension case secured to thrust plate from below and locked with flow section housing. Said shaft runs in running section housing bearings and while its lower support extends through suspension case and into flow section housing to be rigidly coupled with impeller hub. Rotor shaft top end is fitted in adapter power coupling. Impeller comprises the main and cover discs with s set of curved vanes. Active volume of intervane channel filling allows forcing out in one impeller revolution of (5.0-1500)x10^-5 m³/rev of transferred medium. Impeller main disc is protected by impeller-like hydraulic lock. Flow section housing has circular ledged wall of wall outer radius smaller than that of impeller vanes.

EFFECT: simplified design, fabrication and assembly, higher reliability and efficiency.

22 cl, 4 dwg