Fig. 6 Machine layout
1 Inlet valve
2 Minimum pressure/check valve
3 Drive motor
4 Oil filter
5 Airend
6 Control cabinet
7 Oil separator tank
8 Air filter
9 Oil/air cooler
10 Add-on cabinet for refrigeration dryer
Ambient air is cleaned as it is drawn in through the filter 8 .
The air is then compressed in the airend 5 .
The airend is driven by an electric motor 3 .
Cooling oil is injected into the airend. It lubricates moving parts and forms a seal between the rotors
themselves and between them and the airend casing. This direct cooling in the compression chamber
ensures a very low airend discharge temperature.
Cooling oil recovered from the compressed air in the oil separator tank 7 gives up its heat in the oil
cooler 9 . The oil then flows through the oil filter 4 and back to the point of injection. Pressure within
the machine keeps the oil circulating. A separate pump is not necessary. A thermostatic valve main‐
tains optimum cooling oil temperature.
Compressed air, freed of cooling oil in the oil separator tank 7 , flows through the minimum pressure/
check valve 2 into the air cooler 9 . The minimum pressure/check valve ensures that there is always
a minimum internal air pressure sufficient to maintain cooling oil circulation in the machine.
The air cooler brings down the compressed air temperature of only 5 to 10 K above ambient. Most of
the moisture carried in the air is removed during this cooling process.
4 Design and Function
4.2 Functional Description of the Machine
9_5721 06 USE
Service Manual Screw Compressor
ASD T Tri-Voltage
25
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