Patent ID: 9528357
Filing Date: 2016-12-27
CPC Classification: E21B,F04D,H02K

Claim Text:
1. A submersible pumping system, comprising: a submersible pump; a submersible motor to power the submersible pump; and a motor protector operatively coupled to the submersible motor, the motor protector having a bellows assembly that moves to expand and contract according to the volume of internal motor fluid within the bellows assembly, the motor protector further comprising at least one stop to limit movement of the bellows assembly, the bellows assembly further comprising a biasing structure which causes the bellows assembly to pressurize the internal motor fluid within the bellows assembly to a positive pressure relative to an external well fluid without relying on an external pressure source; wherein the at least one-stop comprises a plurality of stops to limit expansion and contraction of the bellows assembly.