ROTORCOMP NK 31 - Load Condition; Switching off

3.8
[en] 02/2014
Installation and operating manual - NK 31ROTORCOMP VERDICHTER
3.8.2 Load condition
The rotor rotation produces vacuum in the suc-
tion port which opens the untake valve 2.
The drawn in air ows via the intake lter 1
through the intake valve 2 directly into the com-
pression chamber of the screw compressor 3.
There the intake air is compressed and oil is
injected for lubrication and cooling.
The oil-air mixture then enters the separator
tank 4 in which the majority of the oil is separated
from the air. The air then ows via the ne sepa-
rator 5 and the minimum pressure valve 6 to the
compressed air outlet.
In the ne separator 5 the oil is ltered out down
to a residual content of < 3 mg/m
3
and then
routed back into the compressor housing via a
nozzle and a non-return valve 11.
When the compressor is switched off, the mini-
mum pressure valve 6 with a non-return function
prevents backow of the compressed air out of
the system into the compression chamber in the
discharge phase.
During startup a faster pressure buildup is also
ensured, which is required for optimum lubrica-
tion and oil separation.
The heat resulting during compression is dis-
sipated via the oil-air mixture. The oil circulation
also results from the pressure difference between
the outlet and inlet pressure. The optimum oper-
ating temperature for the oil is adjusted by the oil
thermostat 7. Depending on the oil temperature,
the oil ow is routed directly via the oil cooler 9 or
directly to the oil lter 8 by the thermostat valve.
The oil then ows via the oil lter 8 to the various
injection points in the compressor block.
3.8.3 Switching off
When the system is switched off pressure builds
up over the rotors and closes the intake valve 2
makeing an oil tight seal.
The remaining pressure is released progressively
via a pressure line from the ne separator 5 to
a nozzle in the intake valve 2. Through this the
system is completely depressurized.