Air compressor air compressor without lubrication swing, applicable to all types of fly ash, cement, lime powder, mineral powder particle diameter less than 0.1mm powder dry material transport and discharge pressure, discharge height up to 15m, horizontal distance of 5m. Air compressor can be driven or direct drive pulley, a reasonable match with the tank, piping compact structure, small resistance, the material quickly, sealing, and effectively raising the rate of ash, reducing the residual rate of powder material.