POWER GENERATOR FOR TELEMETERING SYSTEM WITH HYDRAULIC COMMUNICATION CHANNEL Russian patent published in 2006 - IPC E21B47/00 

FIELD: survey of boreholes or wells, particularly to supply electric power to downhole instruments during well drilling.

SUBSTANCE: generator comprises axle-like stator and outer rotor supported by two rubber bearings and provided with two turbines. Electrical connectors are created in inner stator cavities and at stator ends. Turbine ends are provided with hard-alloy rings. Spring-loaded hard-alloy rings of end seal rest upon hard-alloy rings of turbine ends and mate them. One or all electric connectors are spring-loaded. Annular gap adapted to equalize pressure difference between generator interior and ambient space is created between axis and end seal members. Spring-loaded electric connector is installed in movable bush inserted in fixed bush arranged in stator axis. Fixed bush is provided with longitudinal slots, which limit axial and radial displacement of pins installed in movable bush. Compression spring is installed between movable bush end and annular extension of fixed bush.

EFFECT: increased service life and reliability.

3 cl, 1 dwg