13-25-607 Page 33
MISCELLANEOUS CONTROL DEVICES
- Refer to Figure 4 - 10, page 35 for the schematic diagram of the
control system.
Intake [Air] Filter (1) -
Captures solid impurities in the air stream entering compressor inlet. It also attenuates
noise emitted by the compressor inlet.
Inlet-Valve Assembly (2) -
This device controls the intake of atmospheric air entering the compressor during the
Load/Unload phases of operation.
·
During the loaded state: The
inlet poppet (2.2)
remains open and enables atmospheric air to enter the
compressor inlet - this is done by venting to atmosphere the gas trapped underside of the piston via
check
valve (19)
and
orifice
(18)
.
·
During the unloaded state: The
3/2-way solenoid valve (Y
) feeds pressurized air underneath the
piston
(2.1)
, forcing it and
the inlet poppet (2.2)
upward and blocking-off the compressor intake. A small purge
check valve (2.3)
, located in the poppet, allows a stream of air to reach (e.g., purge) the rotors and keep
them from unstable, noisy operation and producing sufficient pressure to maintain cooling / lubricating oil
flow. A small amount of air is dispensed by
orifice (18
) to scavenge shaft seal challenge back into the
compressor inlet. See Section 9, page 53, for maintenance information.
Electric Motor (3) –
Drives the
compressor (4)
via a
belt drive assembly (5).
It is energized by the variable
frequency drive, which in turn is controlled by the ASG2 controller.
Oil Sump (6) –
This pressure vessel is an integral part of the compressor module. It separates by inertial effects
the bulk of the compressed air and injection oil streams and serves as a sump for the latter.
Air/oil separator (7) -
Intercepts and coalesces the aerosol oil stream in the compressed air exiting the inertial
separation process within the oil sump.
Oil Filler Cap (8) –
Oil fill port on the oil sump.
Oil drain [plug] (9)
– It is the low drainage point for the oil system. It is located on the oil cooler.
Oil Level Indicator (10) -
This gauge is located on the oil sump and indicates the oil level. See
“Oil Level Gauge”
on Section 5, Page 36, for more details.
Oil Filter (11) -
Captures solid impurities in the oil entering the compressor injection port.
Oil Cooler (12) –
The air-cooled heat exchanger removes heat from the oil stream prior to injection.
Pressure Relief Valve (13)
– This device protects the pressure containing components of the compressor
package against high pressure exceeding 188.5 psig. Section 9, See page 53, for maintenance information.
Minimum Discharge Pressure/Check Valve (14) -
This device maintains minimum pressure (70psig) within the
air/oil sump, thus ensuring adequate lubricating oil injection flow to the compressor even when no air delivery into
the system is taking place. It also functions as a check valve to prevent reversed air flow from the system line
during compressor stoppage. See Section 9, page 53, for maintenance information.
Air cooler (15) –
The air-cooled heat exchanger removes heat from the air stream prior to exit from the package.
Scavenge line orifice (16) –
This orifice controls the amount of oil and compressed air that is returned from the
air/oil separator back into the compressor.
Thermal Mixing Valve (17) –
This device mixes hot oil from the oil sump and cooled oil from the oil cooler prior to
delivery to the oil filter and ultimate injection. See Section 9, page 53, for maintenance information.
Содержание APEX15-18A
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