DEVICE FOR COOLING AND PROTECTING FROM SOLID PARTICLES OF MECHANICAL SEAL FOR SUBMERSIBLE ELECTRIC MOTOR Russian patent published in 2018 - IPC F04D13/10 F04D29/70 H02K5/124 

FIELD: engines and pumps.

SUBSTANCE: invention relates to producing submersible downhole electric pumps and compressors. Device for cooling and protecting against solid particles of the mechanical seal for a submersible motor connected by a coupling with a pump has a sand-spreader on the outer cylindrical surface of the coupling and a hollow cylinder in the lower part of the coupling. Cylinder forms, together with the cylindrical part of the stationary ring of the mechanical seal, a gap for removing solid particles from the sealing zone. Sand-spreader is a disc with six blades arranged able to remove solid particles from the mechanical seal zone through holes in the motor housing arranged at the level of the blades and to supply fresh borehole fluid through holes in the pump base arranged above the blades. Blades have the height of 5 mm, the thickness of 3 mm and are inclined at the angle of 30° relative to the longitudinal center axis of the coupling. Device is equipped with a submersible separator of finely dispersed mechanical impurities in order to filter individual remaining abrasive particles installed at the inlet of the submersible pump.

EFFECT: invention is aimed at increasing the service life of the electric motor by improving the conditions for removing solid particles and cooling the mechanical seal.

6 cl, 1 dwg