CENTRIFUGAL PUMP WITH SYMMETRICAL IMPELLERS Russian patent published in 2003 - IPC

FIELD: mechanical engineering; pumps. SUBSTANCE: proposed pump consists of rotor and stator. Stator has housing with cover, inlet and outlet branch pipes and guide vane assemblies secured on housing. Guide valve assemblies include vanes forming spiral channels and transfer channels between symmetrically arranged stages. Rotor is provided with symmetrically arranged impellers and is installed on bearings in stator, one of said bearings being spring-thrust one. Intermediate ring chamber is formed between guide vane assemblies of first and second stages. Transfer channels are made in vanes of guide vane assembly. Said vanes are thin-walled, and contour of through hole in vane forming the channel is close to shape of vane contour. EFFECT: improved manufacturability of pump, reduced hydraulic losses at transfer of flow to second stage, improved mass and dimension characteristics of pump. 2 dwg