The traditional piston compressor is a compressor that relies on the reciprocating movement of the piston to pressurize the gas and deliver the gas. It has a working volume and the suction and exhaust ports are periodically switched on and off. The shortcomings of the speed cannot be too high, the piston is easy to wear and the maintenance is large, so that it is gradually eliminated from the market. However, screw compressors are slowly being welcomed by the market due to their small size, light weight, easy maintenance, high reliability, and high efficiency.