Operating Manual - NK 100
[en] 09/2008
3.3
3.3.2 Starting
When starting the compressor, the solenoid valve
of the control unit is energized. The intake valve
2
is closed by the spring
3-3/4
. The rotors of the
screw compressor
4
suck in air via the bypass
hole and the non-return valve
14
. This air is com-
pressed. The pressure slowly increases in the
separator tank
5
. The compressed air is routed
over the control piston
3-3/3
of the intake valve via
the control unit
3
. This opens the intake valve and
the air can flow through the intake valve into the
compression chamber.
3.3.3 Feed phase
During the feed phase the air drawn in flows via
the intake filter
1
through the intake valve
2
directly into the compression chamber of the
screw compressor
4
. There the intake air is com-
pressed and oil for lubrication and cooling is
injected.
The oil-air mixture then enters the separator
tank
5
in which the majority of the oil is separated
from the air. The air then flows via the fine separa-
tor
6
and the minimum pressure valve
7
to the
compressed air outlet.
In the fine separator
6
the oil is filtered 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
12
.
When the compressor is switched off, the mini-
mum pressure valve
7
with a non-return function
prevents backflow of the compressed air out of the
system into the compression chamber in the dis-
charge phase.
During startup a faster pressure buildup is also
ensured, which is required for optimum lubrication
and oil separation.
The heat resulting during compression is dissi-
pated via the oil-air mixture. The oil circulation also
results from the pressure difference between the
outlet and inlet pressure. The optimum operating
temperature for the oil is adjusted by the oil ther-
mostat
8
. Depending on the oil temperature, the oil
flow is routed directly via the oil cooler
10
or
directly to the oil filter
9
by the oil thermostat valve.
The oil then flows via the oil filter
9
to the various
injection points in the compressor block.
3.3.4 No-load operation
When the final pressure in the storage tank is
reached, the solenoid valve
3.1
is deenergized by
a pressure switch. As a result, the compressed air
over the control piston
3-3/3
of the intake valve is
discharged into the atmosphere by the solenoid
valve and the spring
3-5/4
closes the valve plate of
the intake valve. With the deenergized solenoid
valve, the discharging of the separator tank is also
initiated via a piston in the control unit. When the
final pressure is reached, the run-on time is
started via a pressure switch.
In the run-on time the separator tank is discharged
to a residual pressure of approx. 1.5 bar. If the
pressure in the storage tank reaches the lower
switch-on pressure in the run-on time, the solenoid
valve is energized again via pressure switches.
This stops the discharging of the separator tank
and the intake valve opens again.
If the lower switch-on pressure is not reached in
the run-on time, the system is stopped and the
separator tank is completely discharged.
When the lower switch-on pressure is reached,
the system starts up again automatically.
3.3.5 Start-Stop mode
When the final pressure is reached in the storage
tank, the system is switched off with pressure
switches. The compressed air over the control
piston
3-3/3
of the intake valve is discharged into
the atmosphere via the solenoid valve. As a result,
the spring
3-3/4
closes the valve plate of the
intake valve.
With the now deenergized solenoid valve, the dis-
charging of the separator tank is initiated via pis-
tons in the control unit. Discharging is carried out
via the discharge delay valve (EVV)
3.1
. Quick
discharging down to approx. 2 bar is carried out
via a non-return valve. At 2 bar the non-return
valve closes and the remaining discharging is car-
ried out via a small nozzle. This prevents the oil
from foaming.
Summary of Contents for NK 100
Page 1: ...Operating Manual SCREW COMPRESSOR COMPACT MODULE NK 100 NK 100 G en 09 2008...
Page 24: ...ROTORCOMP VERDICHTER Operating Manual NK 100 3 16 en 09 2008...
Page 44: ...ROTORCOMP VERDICHTER Operating Manual NK 100 8 4 en 09 2008...
Page 50: ...ROTORCOMP VERDICHTER Operating Manual NK 100 10 4 en 09 2008...
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