Air compressor principle working process

Principle of screw air compressor

1. Inspiratory process:

the screw-type air intake port must be designed so that the compression chamber can fully inhale, while the screw compressor does not have an air intake and exhaust valve group. The air intake is only adjusted by the opening and closing of a regulating valve. When the rotor rotates, the tooth groove space of the main and auxiliary rotors will be the largest when it is turned to the opening of the intake end wall. At this time, the tooth groove space of the rotor communicates with the free air in the air inlet, because all the air in the tooth groove is discharged during exhaust, when the exhaust is over, the tooth groove is in a vacuum state. When it turns to the air inlet, the outside air is sucked in and flows into the tooth groove of the main and auxiliary rotors along the axial direction. When the air fills the entire tooth groove, the end surface of the air inlet side of the rotor turns away from the air inlet of the casing, and the air between the tooth grooves is closed.

2. Closure and conveying process:

at the end of the suction of the main and auxiliary rotors, the teeth of the main and auxiliary rotors are sealed with the casing. At this time, the air is closed in the tooth groove and no longer flows out, that is, [closing process]. The two rotors continue to rotate, their tooth peaks and tooth grooves coincide at the suction end, and the anastomosis surface gradually moves to the exhaust end.

3. Compression and fuel injection process:

in the conveying process, the meshing surface gradually moves to the exhaust end, that is, the tooth groove between the meshing surface and the exhaust port gradually decreases, the gas in the tooth groove is gradually compressed, and the pressure increases, which is the [compression process]. At the same time, the lubricating oil is injected into the compression chamber and mixed with the chamber gas due to the pressure difference.

4. Exhaust process:

when the meshing end surface of the rotor turns to be connected with the casing exhaust, (the pressure of the compressed gas is the highest at this time) the compressed gas starts to be discharged until the meshing surface of the tooth peak and the tooth groove moves to the exhaust end surface. At this time, the tooth groove space between the meshing surface of the two rotors and the casing exhaust port is zero, I .e. the exhaust process is completed. At this time, the tooth groove length between the meshing surface and the casing inlet of the rotor is the maximum, its inspiratory process is underway again