FLUSHING UNIT OF DRILLING BIT Russian patent published in 2019 - IPC E21B10/60 

FIELD: soil or rock drilling.

SUBSTANCE: invention relates to flushing units of drill bit, mainly cone type. Flushing unit of the drilling bit comprises a nozzle and a sealing element fixed in the socket of the channel of the bit body by means of the main insert with a support collar on the inner surface under the end of the nozzle and a stop threaded bushing connecting the body of the bit to the main insert. Flushing unit is equipped with additional insert shaped to half-moon and located in vertical plane diametrically opposite relative to main insert. Extra insertion is arranged between nozzle outer surface and sidewall. Additional insert is made of resilient material with possibility of pressing the main insert and threaded bushing to the bit body.

EFFECT: improving operating reliability of the flushing unit due to protection of nozzles against destruction by impact loads and protection of the locking unit from unscrewing.

1 cl, 2 dwg