PNEUMATIC PERFORATOR Russian patent published in 2008 - IPC E21B6/00 

FIELD: pneumatic machines with independent rod rotation.

SUBSTANCE: perforator cap has at least one pair of communicated high-pressure annular accumulation channels and at least one low-pressure accumulation channel formed from stator side and communicated with atmosphere through low-pressure channel or channels of mandrel body. Inner helical orifices are formed in rotor body. The helical orifices have the first ends opened from cap side and the second, blind, ends shifted at least 90° from opened ends and adapted to supply compressed air into high-pressure working chambers and to remove compressed air from low-pressure working chambers through radial orifices communicated with space between teeth and arranged in rotor teeth troughs from the side of blind helical orifice end. Channels included in high-pressure system or systems for compressed air supply to high-pressure annular accumulation channel from the side of cylinder with striker has cross-sectional areas of not less than 0.8 of that of inlet segmented crescent-shaped window. High-pressure annular accumulation channel has cross-sectional area defined from the side of cylinder with striker of not less than 0.4S/n, where S is cross-section of inlet segmented crescent-shaped window, n is number of cylinder body channels for compressed air supply in high-pressure working chambers. Cross-sectional area of high-pressure accumulation channels is 0.8-1.5 of that of inlet segmented crescent-shaped window. Cross-sectional area of low-pressure channel or channels for compressed air discharge from low-pressure working chambers is not less than 0.7 of that of outlet segmented crescent-shaped window.

EFFECT: provision of optimal conditions of compressed air outflow in independent rod rotation mechanism to increase perforator rod torque and decreased specific compressed air consumption.

2 cl, 2 dwg