The working cycle of a screw compressor can be divided into three processes of suction, compression and exhaust. As the rotor rotates, each pair of intermeshing teeth successively complete the same duty cycle.
Intake process compression and injection process exhaust process
1) Inhalation process: When the rotor rotates, the space of the groove of the main and auxiliary rotors is the largest when it is turned to the opening of the inlet end wall. At this time, the space of the groove of the rotor communicates with the free air of the intake port, and the outside air That is, it is sucked into the closed cavity composed of the male and female rotors and the casing. When the air fills the entire groove, the intake end of the rotor is turned away from the air inlet of the casing, and the air between the grooves is closed.
2) Compression process: As the rotor rotates, the inter-tooth volume is continuously reduced due to the meshing of the rotor teeth. The volume occupied by the gas enclosed in the interdental volume is also reduced, resulting in an increase in pressure, thereby achieving a gas compression process. The compression process can continue until the interdental volume is about to communicate with the vent.
3) Exhaust process: When the closed volume between the teeth communicates with the exhaust port, the compressed gas begins to drain. As the volume between the teeth continues to decrease, the compressed gas is completely discharged.
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