LUBRICATION SYSTEM FOR TELEMETERING SYSTEM POWER SUPPLY GENERATOR Russian patent published in 2007 - IPC E21B47/00 

FIELD: survey of boreholes or wells, particularly electric machines adapted to supply power to well logging apparatus of telemetering systems, which controls parameters during well drilling and are adapted for information transmission during oil and gas well drilling.

SUBSTANCE: lubrication system comprises filling device, cavity defined between outer rotor and stator and filled with liquid lubricant, as well as pressure and thermal liquid lubricant expansion compensator of piston-type. The compensator is arranged in upper generator side and connected to generator rotor connected to lower cowl from another side thereof. End seal is installed in the lower cowl. Liquid lubricant may be discharged into environment by releasing movable spring-loaded part of end seal. Summary force of springs pressing movable end seal part to fixed one exceeds that created at movable end seal part by liquid lubricant pressure caused by compensator spring action on pressure compensator piston and by generator turbine pressure difference. Fixed end seal part has shoulder abutting against end of inner bearing ring and is sealingly retained by generator stator axis. Movable end seal part may slide in axial direction in lower cowl of the generator, is sealed with respect to inner surface thereof and is spring-loaded relatively ring. Pins are installed on outer ring surface. Pins are inserted in slots made in lower cowl end. Movable end seal part also has slots adapted to receive positioning screws to limit movable part travel and to prevent spring falling out. The positioning screws are located in threaded orifices made in ring side.

EFFECT: increased generator reliability and service life, decreased maintenance costs and improved reliability of generator air-tightness after generator flushing with liquid lubricant.

5 cl, 7 dwg