Piston compressor is a kind of compressor relying on the reciprocating motion of the piston to make the gas pressure and transport gas compressor. It is a volumetric compressor, also known as "reciprocating piston compressor" or "reciprocating compressor". Mainly by the working chamber, transmission parts, body and auxiliary components. The working chamber is directly used to compress the gas, by the cylinder, cylinder liner, valve, packing, piston and piston rod. Piston driven by the piston rod in the cylinder for reciprocating motion, the piston on both sides of the working chamber volume size for the opposite change in turn, the volume decreases on the side of the gas due to the pressure increase through the valve discharge, the volume increases on the side due to the decrease in gas pressure through the valve suction of the gas, the transmission components used to achieve the reciprocating motion, there are crankshaft connecting rods, eccentric slide, swashplate, etc., which is the most common use of the crankshaft connecting rod mechanism, which consists of the cross head, connecting rod and It consists of crosshead, connecting rod and crankshaft.