HYDRAULIC IMPACT DEVICE Russian patent published in 2015 - IPC E21B37/00 

FIELD: mining.

SUBSTANCE: device contains a housing, a connecting branch pipe, a seat with longitudinal grooves and a throttle channel, a pusher with a punched cage with a seat and a spherical valve inside, a ring piston with a hollow rod, a nut. Between the hollow rod and the barrel a ring chamber is formed which is hydraulically connected by a circulating hole with the ring channel between the barrel and the housing and, through the throttle channel in the seat body, with the axial channel of the extender. The ring piston is rigidly connected with the pusher fitted with the transitional coupling with the punched cage inside, freely installed with a possibility of interaction by the end valve on the outer side with a bearing surface in the connecting branch pipe which is rigidly connected with the housing through the extender. The nut is connected with a barrel and forms movable connection with the hollow rod. The rod is rigidly connected with the ring piston. The area of the ring piston from the side of ring chamber is smaller, than the area of the ring piston being sat on the seat.

EFFECT: design simplification, improvement of efficiency of destruction of sand plug.

3 dwg