PERCUSSIVE ROCK DRILL BIT WITH FLUSHING GROOVES Russian patent published in 2018 - IPC E21B10/38 E21B10/40 

FIELD: soil or rock drilling; mining.

SUBSTANCE: invention relates to a percussive rock drill bit. Bit comprises a head portion formed at one end of an elongate shank having an internal channel extending axially from one end of the shank to the head portion. Head portion has a front surface and a plurality of segments of an annular ridge, spaced around the circumference around the longitudinal axis of the bit and installed along the perimeter of the front surface having a dome shape. Bit also comprises a plurality of front cutting carbide inserts located on the front surface, and a plurality of calibrating carbide inserts made on the segments of the annular ridge; a plurality of flush grooves extending radially outward from the axis on the front surface and extending axially backward to form and circumferentially segment the annular ridge segments, each of the grooves ends in the vicinity of the shank; at least one fluid passage connected to the channel and exiting as a calibrated orifice in the vicinity of the front surface of at least one of the flushing grooves. Calibrated orifice is recessed axially from the front surface of at least one of the grooves. Section of the length of the flow path of each of the flush grooves is convex in the direction from the front surface to the shank relative to the axis of the bit. Section of the length of the flow path is set to extend continuously axially back from the zone of the calibrated orifice in the direction of the shank so that no part of the length of the flow path is set perpendicular to the axis of the bit, which ensures an unobstructed flow path for the passage of fluid axially back from the calibrated orifice to the shank and between the segments of the annular ridge.

EFFECT: technical result is a higher rate of penetration during drilling.

13 cl, 6 dwg