DRILLING BIT WASHING DEVICE Russian patent published in 2009 - IPC E21B10/18 

FIELD: mechanics, mining.

SUBSTANCE: washing device incorporates a hollow casing with a tapered thrust ledge on its inner surface, jet nozzle with a sealing element fitted on the said ledge and a retainer representing a threaded bush in contact with the said nozzle top end face. The device incorporates additionally extra sealing elements fitted above and below the main sealing element. The upper sealing element is arranged in the area where the casing, the nozzle and the threaded bush are in contact. The lower sealing element is fitted between the thrust ledge and nozzle, shifted relative to the main sealing element towards the nozzle axis. The threaded bush lower end face and the casing have, in the contact area, the parallel tapered sections forming the seat for the upper extra sealing element. The apex of tapered sections faces the nozzle. The lower extra sealing element is fitted in circular space between the additional stages on the nozzle lower end face and the casing thrust ledge.

EFFECT: simpler mounting and dismantling, higher reliability and efficiency.

4 cl, 3 dwg