Eaton Compressor Polar Air PRS0050001, Руководство по эксплуатации

Страница: 20 / 38

Polar Compressor Rotary Screw Compressors
Revision July.2015 www.eatoncompressor .com 877.283.7614
20 | P a g e
Mechanical Components (Continued)
2. Variable Speed Drive (Energy saving
device) Ready Cabinet
This cabinet has allocated space and
cooling fan to house variable speed drive
components. To convert to Variable
speed drive, contact Polar Air customer
service for more information,
1-877-
283-7614.
3. Air Suction Filter (Air Intake)
A dry type paper filter with filtra-
tion of 5 ppm, replace after first
600 hours of operation; then every 2000
hours, depending on environment. Refer
to the computer controls of the
compressor to monitor operating time
and reset maintenance timer when filter
is replaced. There is an automatic alarm
that can be set to remind operator of
service times.
4. Suction Valve
A suction Valve is a butterfly valve that
opens and closes during operation. When
PLC calls for air, the suction valve opens
through a solenoid valve to allow
compressor to load. When air pressure
reaches preset max level, the PLC closes
the suction valve allowing compressor to
pull vacuum and not compress air, or
unload.
5. Regulation Modulation Control
This device is included on all 100-200
hp models as an energy saving feature
for applications with duty cycles of 50%
or more. The device keeps amp load
lower by maintaining motor operation so
consistent air pressure is delivered under
heavy workloads. Units with lower duty
cycles should use online/offline
(min./max. pressure) control. Both
control methods are available so
appropriate features can be selected for
Different air demands.
It is important to
monitor air demand since it takes 15%
more power to operate compressor for
every10 PSI of pressure increase.
6. Air End
Two rotor shafts are mounted on
bearings parallel to each other in the
machine casing. The casing has an air
inlet at the top and an air outlet at the
bottom. The shafts have precisely
machined, helical shaped screw threads
which work together to compress air. Air
compression occurs through a four
course process:
A.
Absorption
The position and shape of the rotor
shafts allow maximum air intake
from the inlet port. As the shafts
turn, the air is forced to move
between the grooves of the screw
threads.
B. Sealing and Conveyance
The air is sealed within the grooves
of the screw threads and conveyed,
or moved, through the machine
casing toward the air outlet.
C. Compression and Lubrication
The rotor shaft screw threads are
designed with decreasing space
between the grooves. As air is
moves through them, it becomes
pressurized and actuates the
lubrication process. Lubricating oil is
pressurized and injected into the
compression chamber during
operation for the following reasons:
a.
To form protective film on rotors
to avoid contact and reduce
friction.
b. To seal in the compressed air to
improve compressor efficiency.
c. To absorb heat to maintain
optimal power.
d. To reduce operating noise.
D. Exhaust
When the air has reached the end of
the rotor shafts, it is fully pressurized
and exhausted into the air tank. As
the rotors turn, the compression
process continues