BOREHOLE ELECTRICALLY DRIVEN PUMP Russian patent published in 2014 - IPC F04B47/06 F04B17/04 

FIELD: engines and pumps.

SUBSTANCE: invention relates to evacuation of fluid from, mainly, oil strippers. Pump piston is aligned with runner 3 having the sealed crosswise web 6 arranged inside cylindrical cavity of said runner 3. Cylindrical cavity of said runner 3 accommodates hollow rod 7 engaged with the runner cavity inner cylindrical surface via seal assembly 8 arranged at outer surface of said rod 7. Rod 7 interior and runner interior communicated therewith communicate via channel with the pump working chamber 20 communicated with outer pumped medium and outlet pipe via inlet, 11 and discharge, 14, valves, respectively.

EFFECT: higher efficiency and reliability, longer life.

9 cl, 5 dwg