New and improved engine designs electrical submersible pump

摘要

FIELD: engines and pumps.;SUBSTANCE: set of inventions relates to borehole pump motors. Borehole pump motor 10 comprises shaft 18, metal sleeve and rotor section 20 engaged with shaft 18 to spin therewith. Motor housing 12 is filled with dielectric lubricant and accommodates shaft 18, sleeve 26, rotor section 20 and stator section 14 coupled therewith. Motor 10 comprises bearing cylindrical housing 28 immersed in said lubricant and having inner cylindrical surface connected with outer cylindrical surface of sleeve 26. Cylindrical housing 28 of the bearing is arranged inside housing 12 with fixed thereto. At least cylindrical surface of sleeve 26 or bearing housing 28 have coating of nickel-boron, its thickness making about 0.00075 inch ±0.00025 inch.;EFFECT: reduced wear.;11 cl, 3 dwg