What is the working principle of belt gas compressor?

What is the working principle of belt gas compressor? 

1. Power transmission: the motor drives the rotor of the main engine to rotate through the pulley, and the torque transmission is realized by the belt, which is simple in structure and convenient for disassembly and maintenance. 

2. Gas compression: the rotor operation changes the volume in the cavity, and gradually reduces the volume to increase the gas pressure after gas is inhaled, thus completing the compression process. 

3. Medium release: after the pressure reaches the set value, the gas is output from the gas outlet, and the sealing structure is matched to prevent gas leakage and ensure the safety of working conditions.