DRILL BIT FLUSHING ASSEMBLY Russian patent published in 2015 - IPC E21B10/60 E21B10/61 

FIELD: mining.

SUBSTANCE: flushing assembly of a drilling bit comprises a housing with a channel and a seat and a nozzle with a sealing element, fixed there by means of a retainer. The retainer is designed as a several step rods with a collet working head, the step with bigger diameter of which is located at the side of the output end face of the nozzle, and the nozzle is designed with through axial companion channels, coaxially to which in the housing from the side of the bottom of the nest a ring boring for placement of collet heads of rods is made, the shanks of which are installed in working position with a possibility of interaction with a ledge between steps of nozzle channels or with an output end face of a nozzle. In ring borings under the large bases of collet heads elastic elements for fixing of retainers in uppermost position are installed.

EFFECT: higher efficiency.

1 dwg