GEAR FOR HYDRAULIC PROTECTION OF SUBMERSIBLE OIL-FILLED ELECTRIC MOTOR Russian patent published in 1995 - IPC

FIELD: electrical engineering. SUBSTANCE: hydraulic protection includes compensator 4 anchored in lower part of electric motor 2 and protector 1 installed in its upper part. Supplementary flexible diaphragm 16 which inner space communicates with outer space of principal diaphragm 13 is positioned between center 10 and lower 11 butt seals. Outer space of supplementary diaphragm communicates with space 25 between upper 9 and center 10 butt seals to secured improved hydraulic protection. EFFECT: enhanced reliability of operation of submersible oil-filled electric motors. 2 dwg