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13–11–602 Page 1
SECTION 1
GENERAL INFORMATION
FIGURE 1–1 – COMPRESSION CYCLE
COMPRESSOR – The Gardner Denver
R
Rotary
Screw compressor is a single stage, positive displace-
ment rotary machine using meshing helical rotors to ef-
fect compression. Both rotors are supported between
high capacity roller bearings located outside the com-
pression chamber. Single width cylindrical roller bear-
ings are used at the inlet end of the rotors to carry part
of the radial loads. Angular contact ball bearings at the
discharge end locate each rotor axially and carry all
thrust loads and the remainder of the radial loads.
COMPRESSION PRINCIPLE (FIGURE 1–1) – Com-
pression is accomplished by the main and secondary
rotors synchronously meshing in a one–piece cylinder.
The main rotor has four (4) helical lobes 90
_
apart. The
secondary rotor has six (6) matching helical grooves
60
_
apart to allow meshing with main rotor lobes.
The air inlet port is located on top of the compressor cyl-
inder near the drive shaft end. The discharge port is
near the bottom at the opposite end of the compressor
cylinder. Figure 1–1 is an inverted view to show inlet
and discharge ports. The compression cycle begins as
rotors unmesh at the inlet port and air is drawn into the
cavity between the main rotor lobes and secondary ro-
tor grooves (A). When the rotors pass the inlet port cut-
off, air is trapped in the interlobe cavity and flows axially
with the meshing rotors (B). As meshing continues,
more of the main rotor lobe enters the secondary rotor
groove, normal volume is reduced and pressure in-
creases.
Water is injected into the cylinder to remove the heat of
compression and seal internal clearances. Volume re-
duction and pressure increase continues until the air/
water mixture trapped in the interlobe cavity by the ro-
tors passes the discharge port and is released to the
air/water reservoir (C). Each rotor cavity follows the
same “fill–compress–discharge” cycle in rapid succes-
sion to produce a discharge air flow that is continuous,
smooth and shock free.
AIR FLOW IN THE COMPRESSOR SYSTEM
(FIGURE 1–4, page 3) – Air enters the air filter and
passes through the inlet unloader valve to the com-
pressor. After compression, the air/water mixture flows
to the separator tank where most of the water is re-
moved by velocity change and impingement. The air
then flows to the aftercooler, then to the moisture sepa-
rator where the water that has condensed out is re-
turned to the air end. The air then flows through the
minimum pressure/check valve and to the plant air sys-
tem.
WATER SYSTEM (FIGURE 1–6, page 4) – Water is
forced by air pressure from the separator tank through
the heat exchanger, the water filter and into the com-
pression chamber injection ports. The water removes
the heat of compression and seals internal clearances.
Seals minimize water leakage out of the compression
chamber.
LUBRICATION – Oil in the oil reservoir flows to the oil
pump and is pumped through the oil filter and into both
the gear housing and discharge bearing housing where
it lubricates both the bearings and the gears. The oil
drains back out of the bottom of the housings and flows
back to the reservoir.
Summary of Contents for TWISTAIR EWDQ D
Page 14: ...13 11 602 Page 4 FIGURE 1 6 AIR WATER SCHEMATIC FIGURE 1 7 OIL SCHEMATIC...
Page 17: ...13 11 602 Page 7 DECALS 206EAQ077 212EAQ077 218EAQ077 211EAQ077 207EAQ077...
Page 18: ...13 11 602 Page 8 DECALS 216EAQ077 206EWD077 222EAQ077 221EAQ077 208EAQ077...
Page 35: ...13 11 602 Page 25 FIGURE 4 2 FLOW CHART FOR SET UP PROGRAMMING...
Page 44: ...13 11 602 Page 34 FIGURE 4 6 CONTROL TUBING SCHEMATIC 206EWD797 A Ref Drawing...
Page 48: ...13 11 602 Page 38 FIGURE 4 10 WIRING DIAGRAM FULL VOLTAGE 202EWD546 REF DRAWING...
Page 49: ...13 11 602 Page 39 FIGURE 4 11 WIRING DIAGRAM WYE DELTA 203EWD546 REF DRAWING...
Page 50: ...13 11 602 Page 40 FIGURE 4 12 AUTO SENTRY ES CONTROLLER DISPLAY...
Page 53: ...13 11 602 Page 43 FIGURE 5 2 FLOW DIAGRAM AIR COOLED 202EWD797 B Ref Drawing...
Page 54: ...13 11 602 Page 44 FIGURE 5 3 FLOW DIAGRAM WATER COOLED 203EWD797 A Ref Drawing...
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