Submersible pump seal section with multiple bellows

F - Mech Eng,Light,Heat,Weapons – 04 – D

Patent

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103/109, 277/65

F04D 13/08 (2006.01) H02K 5/124 (2006.01) H02K 5/132 (2006.01)

Patent

CA 1159716

ABSTRACT OF THE DISCLOSURE A seal section for a submersible pump assembly has multiple seal chambers, each with an independent bellows. The seal section is located between the motor and the pump, and receives a shaft driven by the motor. At least one partition is located in the seal section, with the shaft sealingly passing through the partition. The par- tition divides the motor and seal sections into a primary chamber and at least one secondary chamber. A primary bellows is located in the primary chamber. The bellows is in contact with well fluid on one side and lubricant of the pump assembly on the other side for equalizing pressure. A secondary bellows is located in the seal sec- tion with one side in contact with the lubricant in the primary chamber and the other side in contact with the lubricant in the secondary chamber. The secondary bellows equalizes the pressures between the two chambers. A check valve in the partition allows fluid to flow from the pri- mary chamber to the secondary chamber for replenishment, but prevents fluid flow in the opposite direction.

388067

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