AIR PULSE DEVICE Russian patent published in 1997 - IPC

FIELD: civil engineering, mining, metallurgy, food industry; devices for restoring friability of dispersed materials and breaking of hang-ups in processing containers. SUBSTANCE: device has inlet branch pipe 2 and outlet branch pipe 3 of shaft 5 through which air is discharged. Shaft is closed by piston 9 whose movement is limited by stop 10. Projections 15 on inner surface of outer cylinder 6 form space through which air from inlet branch pipe 2 gets through holes 12 into piston space. Housing is divided by partition 12 provided with through holes 14. Air is discharged when outlet branch pipe 3 is placed in communication with atmosphere by mean of control device 4. To provide reliable closing of shaft, cylindrical recess 16 is made in end face of piston, and ring recess 17 is made in housing around inlet hole of shaft. Diameter of recess 16 is greater than inner diameter of recess 17 which is filled up with shock absorbing material. EFFECT: improved reliability. 2 cl, 1 dwg