Metal Bellows Seal Section and Method to Evacuate Air During Filling

摘要

An electrical submersible pump assembly has a seal section coupled to a motor that drives the pump. The seal section has first and second end members spaced axially apart from each other. An outer bellows has a fixed end mourned to the first end member and a floating end that moves axially relative to the fixed end. A rigid, tubular interconnect member has an inner end within the outer bellows and an cuter end fixed to the floating end of the outer bellows. An inner bellows has a floating end secured to the inner end of the interconnect member and a fixed end secured to the second end member. An interconnect evacuation passage extends axially through a side wall of the interconnect member. A first end member evacuation passage extends through the first end member and registers with the interconnect evacuation passage while the outer bellows is contracted.

主权项

1. An electrical submersible pump assembly, comprising:
a pump; a motor operatively coupled to the pump for driving the pump; a seal section having a longitudinal axis and coupled to the motor, the seal section comprising: axially spaced apart first and second end members; a bellows having a fixed end mounted to the first end member and a floating end that moves axially as the bellows moves between an extended and a contracted position; a rigid sleeve located within the bellows, defining a sleeve annul as between the sleeve and the bellows, the sleeve having an outer end that joins and moves axially with the floating end of the bellows; a sleeve evacuation passage in the side wall of the sleeve extending from the inner end of the sleeve to the sleeve annulus adjacent the outer end of the sleeve; and a first member evacuation passage through the first end member to evacuate air from an interior of the bellows and from the sleeve evacuation passage prior to filling with lubricant.