PRELIMINARY MOUNTED REPLACEABLE INSERT OF DRILLING FLUSHING DEVICE Russian patent published in 2017 - IPC E21B21/02 

FIELD: machine building.

SUBSTANCE: invention relates to drilling flushing device preliminary mounted replaceable insert for connection of stationary flushing tube with drill hole rotating flushing tube. Insert comprises mechanical sealing assembly with stationary sealing ring and rotating sealing ring, sealing ring first carrier, on which stationary sealing ring is located, sealing ring second carrier, on which rotating sealing ring is arranged, connection component, which is made with possibility of replaceable insert connection with stationary flushing tube, and control mechanism, made with possibility of action in axial direction with helical joint for change of replaceable insert axial length, wherein screw connection is connected to sealing ring second carrier to provide control in axial direction of sealing ring second carrier, mechanical sealing assembly and sealing ring first carrier relative to connection component.

EFFECT: simplified design, increased service life, enabling fast and safe replacement.

15 cl, 8 dwg