SUBMERSIBLE PLUNGER PUMP UNIT AND ITS LINEAR ELECTRIC MOTOR Russian patent published in 2011 - IPC F04B47/06 H02K41/25 

FIELD: engines and pumps.

SUBSTANCE: device is intended for oil lifting from wells and can be used for pumping-out of formation water and mining operations of underground mineral resources laid at big depths in liquid state. Device includes housing (1), electric motor (2), stock (7), plunger (8), cylinder (10), inlet and outlet valves (12, 13), drain electromagnetic valve (18), which are connected to tubing string (14). In bilateral unit cooled with pumped liquid with linear electric motor (2) cooled with dielectric liquid there installed is the second plunger (9), the second cylinder (11) and the second pair of valves (15,16). Linear electric motor (2) includes housing (3), double-ridge stator (4), the secondary element (7). Secondary element (7) is made from electrically conducting long multi-layer plates (21) with transverse slots (22) offset relative to each other and filled with dielectric material.

EFFECT: controllability of efficiency from zero to maximum, absence of mechanical transmissions and bearings; increasing service life, reducing life between overhauls, energy consumption, prime cost, and providing uniform outlet liquid flow and thrust increase.

5 cl, 4 dwg