Vmac RAPTAIR-G30, Руководство по обслуживанию

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VMAC
– Vehicle Mounted Air Compressors
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10
Operating Principles
Air Compression
The Gas Drive uses a VMAC designed and manufactured flooded-lobe,
rotary screw compressor. The oil-filled compressor housing contains two
rotors. Compression occurs when inlet air (at normal atmospheric
pressure) enters a chamber where it is trapped between meshing rotor
lobes. Cooled oil is injected into the rotors during compression to
lubricate the rotors and bearings, absorb the heat of compression, and
seal the rotor lobes to allow for efficient compression. As the rotors
rotate, the meshing lobes compress the volume of the trapped air/oil
mixture before sending it down the discharge line to be cooled and
separated by the WHASP tank.
Oil Separation and Cooling
The system uses a WHASP (Waste Heat Air Separation Package) tank
combined 2-stage air/oil separator and oil cooler. The hot air/oil mixture
from the compressor enters the cooler on the top of the tank, where the
mixture is cooled, the majority of the oil separates from the air (first
stage separation), and settles into the reservoir tank below the cooler.
The cooled oil then passes through a high-pressure oil filter before being
returned to the compressor via the oil return line. The remaining oil mist
and fine droplets are removed from the air by passing the air through a
coalescing filter (second stage separation). Oil removed by the
coalescing filter is collected and returned to the compressor via the 1/4”
scavenge tube.
A liquid-to-air cooler with electric fan maintains operating temperatures
which increases system durability and reduces the temperature of the
compressed air.
Minimum Pressure Check Valve
The WHASP tank has a built-in minimum pressure check valve (MPCV)
to maintain a minimum pressure of approximately 60 psi (410 kPa) in the
WHASP tank. This ensures compressor lubrication and cooling, as well
as oil separation in the coalescing filter. Air will not flow out of the
WHASP tank until around 60 psi of air pressure is reached. The MPCV
is factory set and requires no adjustment or servicing.
No separate check valve is required or recommended when connecting
the WHASP tank output to a receiver tank.