Radial Bearing Thrust Washer Arrangement for Submersible Pump Motor

摘要

An electrical submersible pump assembly has a motor that drives the pump. The motor has a stator having a bore, a shaft extending through the stator, and rotor sections mounted to the shaft, each of the rotor sections having first and second end rings. A non rotating bearing body has a periphery retained in non rotating engagement with the bore of the stator. The bearing body has a first end axially spaced from the first end ring, defining a first gap, and a second end axially spaced from the second rotor ring, defining a second gap. A first thrust washer is located in the first gap. Each thrust washer has a metal or carbide thrust surface for contact with the bearing body and an elastomeric thrust surface for contact with one of the end rings.

主权项

1. An electrical submersible pump assembly, comprising:
a pump; a motor operatively coupled to the pump for driving the pump, the motor comprising: a stator having a bore; a shaft extending through the bore along an axis of the motor; first and second rotor sections mounted to the shaft for rotation therewith; a radial bearing located between the first and second rotor sections, the radial bearing comprising: a non rotating bearing body having a central opening through which the shaft extends and a periphery in non rotating engagement with the bore of the stator, the bearing body having a first end axially spaced from the first rotor section, defining a first gap, and a second end axially spaced from the second rotor section, defining a second gap; a first thrust washer arrangement located in the first gap for transferring thrust between the first rotor section and the first end of the bearing body when the first gap narrows due to thermal growth; a second thrust washer arrangement located in the second gap for transferring between the second rotor section and the second end of the bearing body when the second gap narrows due to thermal contraction; each of the first and second thrust washer arrangements having a bearing body surface that engages one of the ends of the bearing body and a rotor section surface that engages one of the rotor sections while transferring thrust; and the bearing body surface of each of the first and second thrust washer arrangements is harder than the rotor section surface.