MULTISTAGE CENTRIFUGAL PUMP Russian patent published in 1999 - IPC

FIELD: manufacture of hydraulic machines, oil excavation from wells. SUBSTANCE: proposed pump has shaft that carries impellers. Impeller of each stage is placed between two adjacent guiding apparatuses with radial and axial clearances, it has open blades with acute angle of inclination with respect to plane perpendicular to rotation axis. Face ends of blades of impellers have upper and lower plates parallel to plane perpendicular to rotation axis. Plates-wings are mounted at some angle on lower plates at some distance from outlet radius. Outer radius of covering disc and plate separating two adjacent ducts of guiding apparatuses decreases from start of concave wall of duct to minimal distance between concave and convex walls of next duct. Ring space is formed between ducts of guiding apparatuses having angle less than 90 degrees across outlet and its hub. EFFECT: enhanced efficiency, pressure and operational reliability of pump. 3 dwg