FLUSHING ASSEMBLY OF THE DRILLING UNIT (OPTIONS) Russian patent published in 2018 - IPC E21B10/60 E21B10/61 

FIELD: drilling of soil or rock.

SUBSTANCE: group of inventions relates to the rock-cutting tool of a predominantly hydromonitoring type, namely to their flushing assemblies. Flushing assembly of the drilling bit comprises the body with the channel and the socket, which is provided with the annular boring, the nozzle with the sealing element and the stopper, which is located in the annular boring of the socket, and the fixing assembly. Fixing assembly consists of a plate, a latch and a protective cover. When in a working position, a free end of the latch is arranged in the slot of the plate to interact with the side wall of the plate and fixed relative to the plate by means of a screw. Protective casing is performed as a cylindrical two-stage one with the internal channel, the step of a larger diameter has the external thread that corresponds to the internal thread in the socket of the flushing assembly, and its end in the working position presses the plate and the latch to the locking cut-off ring and to the nozzle. Stage of smaller diameter terminates near the end of the nozzle and, with its end face in working position, it thrusts the nozzle onto the body of the flushing assembly by means of an elastic element in the form of a sealing ring, which is rigidly fixed in the annular boring at the end of the nozzle, which interacts with the end of the stage of a smaller diameter of the protective casing. Protective casing at the output end flush with the body has at least four longitudinal through holes at a radial distance, which is equal to the radial distance to the specified screw. In at least two longitudinal through holes, the carbide cylindrical inserts are pressed, the length of each of them is greater than the thickness of the step of a larger diameter of the protective casing, and the inner channel of the protective casing is made with a screw thread.

EFFECT: technical result consists in improvement of efficiency of flushing unit.

2 cl, 6 dwg