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

FIELD: engines and pumps.

SUBSTANCE: lower end of housing 1 accommodates valve assembly 4 with shutoff balls 5 and damper 7. Besides it housing 1 comprises the system of pressure system pistons. First stage piston 8 arranged above damper 7 is composed by the valve with shutoff balls 9. Inductors 12, 13 are arranged inside second and third stage piston bodies 10, 11, respectively. Pistons have axial holes 14 and are separated by chambers 15, 16, 17. Pump incorporates extra inductor 18. Outlet chamber 19 houses extra outlet piston 20. Rod 21 of said extra piston 20 is hollow and recessed into axial hole of extra inductor 18. Radial holes 22 arranged under extra piston 20 are made at outlet chamber sidewalls. Pistons 8, 10, 11 of pressure stages are equipped with pipes 23, their ends being recessed in axial holes of pistons of the next stages. Third stage piston pipe is recessed in axial hole of extra inductor 18. Limiters are arranged in axial holes of pistons 10, 11 and extra coil 18 axial hole to prevent fall pipe out from said holes. Last stage piston pipe interacts with the rod 21 of piston 20. Radial holes 24 have radial holes made at pipe bases.

EFFECT: summed stroke owing to multistage delivery system.

2 cl, 9 dwg