FLUSHING ASSEMBLY OF DRILLING BIT Russian patent published in 2014 - IPC E21B10/60 

FIELD: mining.

SUBSTANCE: flushing assembly of a drilling bit includes a housing with a passage and a seat provided with an annular bore, and a nozzle with a sealing element, which is installed in the seat and fixed there by means of a retaining split-type ring arranged in the annular bore of the seat. Flushing assembly is equipped with an additional split-type ring having a stepped shape in a longitudinal section; besides, the additional split-type ring is arranged between the lower edge of a head piece and the upper edge of the stop split-type ring so that in working position the outer surface of the stage of smaller diameter can contact the inner surface of the stop ring.

EFFECT: improving operating reliability and efficiency of the whole bit.

1 dwg