Protection apparatus for liquid-filled submergible motors and th

Details Protection apparatus for liquid-filled submergible motors and th Protection apparatus for liquid-filled submergible motors and th

1982-03-09

1984-12-11

Reger, Duane A.

Brakes

Internal-resistance motion retarder

Having a thrust member with a variable volume chamber

310 87, F04B 2102

Patent

active

044872992

ABSTRACT:
This disclosure pertains to protection apparatus for liquid-filled submergible equipment such as downhole electric motors used in oil wells and the like. The protection apparatus provides a positive bias force on the filling liquid so that any liquid leakage through motor seals and the like takes place from the inside out. The positive bias pressure is created by a piston having a substantially constant biasing pressure applied thereto by constant force springs. The piston operates in a cylinder which communicates at its head-end with the equipment being protected. The base-end of the cylinder communicates with a conventional labyrinth-type protector for maintaining an interface between the protecting liquid and well fluid externally of the cylinder.

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