DEVICE FOR HYDRAULIC PROTECTION OF SUBMERSIBLE OIL-FILLED ELECTRIC MOTOR (OPTIONS) Russian patent published in 2018 - IPC F04D13/10 H02K5/12 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to the field of oil production and can be used for hydroprotection of submersible electric motors of electric centrifugal pumps for producing formation fluid from wells. Device for hydraulic protection of a submerged oil-filled electric motor comprises a shaft, a head, a thrust and radial bearings, at least one compensation module with an end seal, two nipples connected by a cylindrical body and a compensating element dividing the compensating module into two cavities. One of the cavities of the compensating module is connected with the annulus through a labyrinth consisting of two axial, one radial and one annular channel in the nipple. Above the mechanical seal there is a dynamic labyrinth including a dynamic bushing that is hermetically seated on the shaft and a labyrinth bushing fixedly installed with a radial clearance in relation to the shaft and the dynamic bushing. Dynamic labyrinth has no hydraulic connection with the cavity of the compensating module.

EFFECT: invention is aimed at increasing the reliability and service life of the device by introducing a labyrinth in the nipple and a dynamic labyrinth.

2 cl, 2 dwg