SYSTEM OF OIL PROTECTION OF STOPE MOTOR Russian patent published in 1996 - IPC

FIELD: well drilling engineering. SUBSTANCE: system of oil protection of a stope motor for drilling bore holes containing an oil-filled chamber A with housing 1 and seals 3, a shaft, a canal B for passage of the drilling mud, a block 9 for partially closing the canal B, and protected mechanism 4 located in the chamber A, is provided with a block signalizing the presence of the drilling mud in lubricant. This block comprises an housing-insulated electrode 5 and a current amplifier 7 both placed in the chamber A. The inlet of amplifier is connected with the electrode 5, and the outlet of amplifier with the block 9. When the drilling mud gets into the chamber A, the gap between the shaft 2 and the electrode 5 becomes electroconductive. The current passing through the drilling mud is amplified by the block 9 and is directed to the executive mechanism of the block 9 thereby closing the passage section of the canal B. When the pressure inside the manifold of the drilling installation rises, the operator must lift the motor and transmit it to a repair. EFFECT: prolonged durability of stope motor. 2 dwg