STAGE OF SUBMERSIBLE MULTISTAGE PUMP Russian patent published in 2003 - IPC

FIELD: oil producing industry. SUBSTANCE: stage of submersible multistage pump consists of impeller and guide vane assembly. Impeller has driving disk 1 with fitted-on blades 2, support ring 3 and hub 4 being combination of bushings 5 and 6. Guide vane assembly has side wall 7, inner wall 8, vanes 9, ring channel 10 and gasket 11 fitted in ring channel, and also bushing 12. Inner surface of bushing 6 is mated with shaft 13, and its outer surface is mated with inner surface of bushing 5n of impeller of following stage and inner surface of bushing 12 of guide vane assembly. Gasket 14 is installed between upper end face of bushing 12 of guide vane assembly and end face of bushing 6 of impeller larger diameter hub. Gasket 15 is installed between lower end face of bushing 12 of guide vane assembly and driving disk 1 of impeller. Invention provides reliability and long service life of pump operating especially in purposely slanted wells, reduces metal usage to reduction of pump length at increase of head without impairing pump characteristics, prevents failures owing to clogging of interblade spaces and reduces vibration of pump. EFFECT: improved reliability and increased service life. 3 cl, 1 dwg