US Patent 7443060 Acoustic compressor with two resonators

A resonator of an acoustic compressor is provided at each side of an actuator so that the two resonators are arranged side by side. Two pistons are provided at the inner ends of the resonators and actuated by the actuator. At the outer end of the each of the resonators, a gas is introduced into the resonator through a suction hole. When the pistons are actuated by the actuator, the gases in the two resonators are oscillated and compressed by the piston and discharged through discharge holes at the outer ends of the resonators.