FLUSHING UNIT FOR DRILLING BIT Russian patent published in 2006 - IPC E21B10/18 

FIELD: rock cutting tools, particularly water-jet ones, namely flushing units thereof.

SUBSTANCE: flushing unit comprises body with channel and socket provided with annular bore, nozzle with sealing member installed in the socket and retaining ring arranged in the annular bore and having fixer. The nozzle has stepped inner surface and is provided with through slots made in nozzle step having lesser diameter. Fixer is made as a disc with extensions on side outer surface, which mate slots made in inner retaining ring surface. Fixer extensions in free state have widths exceeding that of through slots made in retaining ring. Fixer length defined by disc extensions exceeds diameter of larger stage of closed retaining ring. The fixer is made of two symmetric parts movably connected one to another by two rods offset relatively fixer axis. Springs are put on the rods and are supported by inner sides of fixer parts facing each other. Rods can be longitudinally displaced.

EFFECT: simplified mounting and demounting of the unit, improved hydrodynamics and operational reliability of the flushing unit and drilling bit as a whole.

3 dwg