DRILLING BIT WITH WASHING UNIT Russian patent published in 2013 - IPC E21B10/60 

FIELD: mining.

SUBSTANCE: drilling bit comprises a body with attachment thread to a drilling string, rock-cutting tools, channels for supply of washing fluid to the bottomhole, seats at the outlet from the channels to install wear-resistant attachments with sealing and stop elements. The end of the seat for the attachment is made with circular protective deepening of the attachment top. The side cylindrical surface of the seat is made with a circular figure slot for placement of an elastic sealing ring of round section, narrowing towards the output at the sharp angle α=12÷20° to the axis of the seat, at the output of which there is thread for installation of a pressing nut and a stop lock-nut with elements for rotation in the seat and central holes for passage of the washing liquid.

EFFECT: increased reliability and durability of a drilling bit with replaceable washing units.

5 dwg