BOGE Operating instructions for C 16 N...C 30 N, C 16 F N...C 30 F N series screw compressors Page 17
Product description 2.2 Function description compressor
2.2 Function description compressor
Function principle of the
air end
The air end operates according to the displacement principle. In the housing,
the main and secondary screws are driven by means of an electric motor and
V-belts.
Both screws have screw-shaped profiles, intermeshing without contact.
Together with the housing wall, these screws form chambers which gradually
reduce in size, seen in air flow direction.
Rotation of the rotors causes the air taken in to be compressed to the final
pressure in the chambers.
During compression oil is continuously injected into the air end. This having a
cooling, sealing and lubricating function.
Air circuit
Fig. 2.1: Components of the air circuit
1 Suction filter
The suction filter cleans the air suctioned by the air end.
2 Suction controller
The suction controller opens (load operation) or closes (idling operation
or standstill) the suction line depending on the operating condition of the
compressor.
3 Air end
The air end compresses the sucked in air.
4 Compressed air/oil vessel
The oil separator separates the residual oil contained in the compressed
air.
5 Oil separator
The oil separator separates the residual oil contained in the compressed air.
6 Minimum pressure check valve
The minimum pressure check valve does not open until the system pres-
sure has increased to 51 psig. This causes a rapid build-up of the system
pressure and ensures lubrication in the starting phase. Once the com-
pressor has been switched off, the check valve prevents the compressed
air from flowing back out of the mains line.
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