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

FIELD: drag-drilling bits and reamers provided with hydraulic monitor heads, particularly flushing units thereof.

SUBSTANCE: flushing unit comprises body with channel and socket having annular boring. Installed in the socket is head with sealing means. Split retaining ring with fixer is arranged in annular boring. Head connected to lower end and retaining ring attached to upper end have coaxial depressions for fixer receiving. Larger fixer dimension exceeds inner diameter of retaining ring in closed state. Depressions made in lower head end and upper retaining ring end may be formed as annular borings. The fixer may be manufactured as disc having diameter less than that of annular depressions of the head and retaining ring in free state. The depressions formed in lower head end and in upper retaining ring end may be formed as blind slots and fixer is produced as mating disc part.

EFFECT: simplified flushing unit mounting and demounting and increased operational efficiency.

3 cl, 3 dwg