(1) Suction process: the motor drives the rotor, the main and secondary rotor tooth groove space in the rotation to the intake end wall opening, the space is large, the outside air is filled with it, when the rotor inlet side end turn away from the shell inlet, the air between the tooth groove is closed between the main and secondary rotor and the housing, complete the suction process.

(2) Compression process: At the end of the suction, the closed volume formed by the main and the rotor tooth peak and the housing decreases with the change of the rotor Angle, and moves in a spiral shape, which is the "compression process".

(3) Compressed gas and oil injection process: in the transportation process, the volume is continuously reduced, the gas is continuously compressed, the pressure is increased, the temperature is increased, and at the same time, the lubrication that becomes mist due to the pressure difference is sprayed into the compression chamber, so as to achieve the role of compression, reduce the temperature seal and lubrication.

(4) Exhaust process: when the closed tooth peak of the rotor rotates to meet the exhaust port of the housing, the compressed air begins to discharge until the anastomose surface of the tooth peak and the tooth groove moves to the exhaust end face, and the space of the tooth groove is zero, that is, the exhaust process is completed. At the same time, the other pair of tooth grooves of the main and secondary rotor have been rotated to the intake end, forming the maximum space to begin the suction process, thus starting a new compression cycle.