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 contains housing with a channel and a seat with circular bore, a nozzle with a sealing element and a split lock ring located in the seat circular bore, which are installed in the seat, and a fastening assembly. The fastening assembly consists of a plate, latch and a protective casing. One of the end parts of the split lock ring is provided with a plate rigidly connected to the split lock ring and made as a blind slot at the upper face end, and the other end part of the split lock ring is equipped with the latch, connected with a locking split ring capabale to rotate by means of the axis. 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 fixed relatively to the plate by means of the screw. The latch and plate for that fastening have coaxial holes and internal threads in the plate hole. The protective casing is of the cylindrical two-stage type with the internal channel; a stage of larger diameter has the outer thread, mating the inner thread in the flashing assembly seat, and press the plate and latch in the working position by its end face to the split lock ring and the nozzle, and 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. The latch and plate are located in the space between the smaller diameter stage and inner surface of the seat, at the outlet end face of the protective casing there are the key slots and the inner channel of the protective casing is formed with a screw thread.

EFFECT: improved flushing assembly operating efficiency.

2 cl, 6 dwg