Adopt rack and pinion meshing to realize simultaneous movement's free piston compressor

The utility model discloses an adopt rack and pinion meshing to realize simultaneous movement's free piston compressor, the expansion box is connected with bounce cylinder and compresser cylinder, be provided with the power cylinder in the expansion box, the power cylinder sets up in bounce cylinder and compresser cylinder, be provided with power piston in the power cylinder, power piston is connected with the piston rod, the piston rod is connected with damper piston and compressor piston, the damper piston sets up in bounce cylinder, compressor piston sets up in the compresser cylinder, the compresser cylinder is provided with snifter valve no. 1 and air bleeding valve no. 1, and the power cylinder is provided with the gear, is provided with the gear shaft in the gear, and the gear shaft is fixed with the power cylinder, is provided with the rack on the gear, rack and gear engagement, and the rack is fixed with the piston rod, the power cylinder is provided with suction hole and exhaust hole. This free piston compressor can accomplish to the piston that moves group that the quality is equal completely, inertial force complete equilibrium during the machine operation, and the bearing capacity is big, realizes the accurate control of stroke.