PNEUMATIC IMPACT ACTION DEVICE FOR FORMATION OF WELLS IN SOIL Russian patent published in 2016 - IPC E21B1/38 E21B4/14 E02F5/16 

FIELD: mining.

SUBSTANCE: invention relates to pneumatic percussion devices for drilling wells in soils. Device comprises hollow housing, striker with central through channel dividing cavity of housing on working and idle stroke chamber, central tube interacting with central through channel of striker, threaded bushing, cover with central through hole for passage of central tube, formed by threaded bushing and cover prechamber circuit air, on surface of central tube is formed by longitudinal throttle channel inlet in idle stroke chamber, shank, which is in idle stroke chamber, wherein shank and threaded bushing are made with through central hole for passage of central tube installed in central hole of cover with a gap, forming a circular throttle channel inlet radial outlet channel in central tube pushed fixed relative to shank and sleeves, in central tube is installed coaxially with annular gap additional tube with radial outlet channel at an acute angle and fixation along its edges relative to central tube. Body cavity on side of idle stroke chamber has a groove, and from annular prechamber circular distribution chamber with annular collar on housing on side of working stroke chamber. Throttle channel on surface of central tube is made in form of a channel-slot or channel-flats to input of annular distributing chamber and output in idle stroke chamber. Hammer is stepped. Rod part on side of circular distribution chamber is equipped with channel-slot or channel-flat head part of channel-slot or channel-flat permanently open on side of annular working stroke chamber, and periodically shut off distributing edge recess in housing on side of idle stroke chamber. Radial outlet channel central tube is connected to annular channel formed by a gap between central and additional tubes.

EFFECT: preventing wastage of air from working chambers and considerable reduction of air flow from network.

1 cl, 1 dwg