FLUSHING ASSEMBLY OF DRILLING BIT (VERSIONS) Russian patent published in 2017 - IPC E21B10/60 E21B10/61 

FIELD: mining.

SUBSTANCE: flushing assembly of a drilling bit includes a housing with a channel and a seat having an annular bore, a head piece with a sealing element and a retaining device arranged in the annular bore of the seat, which are installed in the seat, and a fastening assembly. Difference consists in the fact that the fastening assembly comprises a plate, a latch and a protective casing. The free end of the latch in the working position is located in the slot of the plate to interact with the side wall of the plate and is fixed relatively to the plate by means of the screw. The protective casing has a cylindrical three-stage type with an internal channel; a stage of larger diameter has an external thread mating the internal thread in the seat of the flushing assembly, and in the working position presses the plate and the latch to the retaining device and the head piece with its end face. The smaller diameter stage ends near the end face of the nozzle, and press the nozzle to the flashing assembly housing by means of elastic element in the form of a sealing ring, rigidly fastened in the circular bore at that end face of the nozzle, which interacts with the smaller diameter stage end face of the protective casing. At the output end of the protective cover there are cutouts for the key and a chamfer made from the side of the inner channel.

EFFECT: improved flushing assembly operating efficiency.

2 cl, 6 dwg