DRILLING DIAMOND BIT Russian patent published in 2014 - IPC E21B10/60 

FIELD: mining.

SUBSTANCE: drilling diamond bit comprises a housing, the blades extending over it, equipped with rock cutting and protective cutters PDC, the washing carbide nozzles in slots on the housing, the central cavity in the nipple of the housing, the channel system supplying washing liquid to the washing carbide nozzles. In the central cavity of the nipple the device is mounted to protect the flushing nozzles from clogging, made in the form of a cylinder or other body of revolution, open at one end and closed at the other, with an outer annular shoulder from the open end for mounting and fixing on the step of the nipple cavity, a plurality of holes of round or other shapes is made in the wall of the device for passage of washing liquid. Area of the central hole in the nipple (S_NIP), the area of the maximum cross-section of the device (S_DEV), the total area of the holes in the wall of the device (S_SIDE) and the total area of the jets of washing nozzles (S_NOZ) are related by inequation S_NIP> S_DEV> S_SIDE > S_NOZ.

EFFECT: improving the reliability and efficiency of the diamond bit operation, protection against clogging of washing carbide nozzles.

4 cl, 4 dwg