ROLLER BIT FOR DRILLING HARD ROCKS THAT FEATURES MECHANICAL SEAL AND FINE HEAT CHARACTERISTICS Russian patent published in 2015 - IPC E21B10/25 

FIELD: process engineering.

SUBSTANCE: set of inventions relates to drill tool and to seals of its bearings. Drill bit comprises the body, at least of shaft of bearings extending from the drill bit body and rolling cone running on said shaft. Mechanical seal is arranged in collar between bearings shaft and rolling cone. Said seal comprises stiff seal ring with the surface of dynamic sealing with rolling cone and the other surface, not sealed, exposed to collar opening. Besides, said mechanical seal includes at least one cooling channel made in said unsealed surface of said stiff seal ring. Note here that cooling channel has open end in fluid communication with collar opening.

EFFECT: longer life of seal and lower operating temperature.

36 cl, 11 dwg