Multi-stage compressor

A compressor, comprising a cylinder block and a piston assembly arranged inside the cylinder block;

• wherein the piston assembly comprises a first piston, a second piston arranged inside the first piston, and a movable assembly connected to the first piston, and the movable assembly is configured to drive the first piston and the second piston to reciprocate;
• the cylinder block is provided with a first compression chamber that defines a space for the first piston to move up and down, and when the first piston reciprocates in the first compression chamber, a gas outside the cylinder block is suctioned in, and the gas is compressed to generate a gas after first compression;
• the cylinder block is provided with a gas storage chamber for storing the gas after the first compression;
• the cylinder block is further provided with a second compression chamber that defines a space for the second piston to move up and down, when the second piston reciprocates in the second compression chamber, the gas after first compression is suctioned from the gas storage chamber, and the gas after the first compression is compressed to generate a gas after second compression;
• a positioning seat is provided in the first piston, the second piston is detachably arranged inside the positioning seat, and the positioning seat pushes the second piston to move at the same time with the first piston.