BOTTOMHOLE TELEMETERING SYSTEM POWER-SUPPLY GENERATOR PRESSURE COMPENSATOR Russian patent published in 2007 - IPC E21B47/12 

FIELD: electric generators adapted to supply power to downhole apparatuses, namely to pressure compensators included in generator lubrication systems.

SUBSTANCE: pressure compensator comprises upper cowl, body, spring-loaded pressure compensator piston having rod connected to end thereof, filling device closed with lid. To prevent pressure compensator piston jamming the piston is centered in pressure compensator along two surfaces of piston and rod exterior. Piston has groove used as seat for sealing ring receiving. Piston has spherical outer surface located from both groove sides. Rod surface has flat edges. Upper cowl orifice profile conform piston rod cross-section to prevent piston rotation during filling device lid handling. Pressure compensator has conical transition from section having lesser diameter to section having greater diameter. Generator turbine is installed on section having lesser diameter. Generator turbine has hub with end projections passing into slots made in generator pressure compensator surface. Turbine is fixed on pressure compensator with upper cowl. Retaining ring is installed between upper cowl and turbine end. The retaining ring is unbent in slots made in turbine end and in upper cowl.

EFFECT: prevention of pressure compensator piston jamming and thermal lubricating liquid expansion, simplified generator maintenance and increased reliability thereof, increased working blade areas.

3 cl, 9 dwg