When the crankshaft of the piston compressor rotates, the piston does reciprocating movement through the transmission of the connecting rod, and the working volume composed of the inner wall of the cylinder, the cylinder head and the top surface of the piston will change periodically. When the piston of the piston compressor starts to move from the cylinder head, the working volume in the cylinder gradually increases, at this time, the gas is pushed along the intake pipe and enters the cylinder, until the working volume changes to the maximum, the intake valve is closed; When the piston of the piston compressor moves in reverse, the working volume in the cylinder is reduced, and the gas pressure is increased. When the pressure in the cylinder reaches and is slightly higher than the exhaust pressure, the exhaust valve is opened, and the gas is discharged from the cylinder until the piston moves to the limit position, the exhaust valve is closed. When the piston of the piston compressor moves in reverse again, the above process is repeated. In short, the crankshaft of the piston compressor rotates once, the piston reciprocates once, and the process of intake, compression and exhaust are successively realized in the cylinder, that is, a working cycle is completed.
