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 ring arranged in the annular bore of the seat. Flushing assembly is equipped with fasteners in the form of bars of stepped shape; nozzle has longitudinal stepped slots on side surface to arrange the fasteners, the height of a larger step of which is lower than height of a step of the nozzle slot of larger size. When in working position, steps of bars of smaller size are installed so that they can interact with inner surface of the retaining split ring.

EFFECT: improving operating reliability and efficiency of a bit; simplifying installation and removal of a flushing assembly.

2 dwg