Quincy Compressor QSB Series, Инструкция по эксплуатации

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Section II - Description
6
Quincy Compressor ® - QSB/T ™
• General Description
• The Compression Cycle
• Air Flow
• Cooling System
• Capacity Control System
• Electrical System
• Indicators
• Gauges
General Description
The QSB/T
™
line of rotary screw compressors covers a
horsepower range of 15 to 50. These belt driven
compressors have standard full load pressure ratings of
100, 125 and 150 PSIG. The large, 127mm rotors allow
Quincy to operate these compressors at lower speeds than
competitive makes. While base mounting is standard, 120
and 200 gallon tank mounting is available.
The compressor is a single stage, positive displacement,
fluid-flooded rotary screw type unit, consisting of two
precision-machined rotors. The drive rotor is driven
through a v-belt arrangement.
All components are attached to a heavy-duty steel frame.
Controls and indicators are arranged on a control panel.
Acoustical cabinets are available to reduce sound levels.
The Compression Cycle
The compression cycle of a rotary screw compressor is a
continuous process from intake to discharge with no
reciprocating mechanisms starting and stopping as found
in reciprocating compressors. The compressor consists of
two rotors in constant mesh, housed in a cylinder with two
parallel adjoining bores. The male drive rotor has four
lobes that mesh with six flutes in the female rotor. All
parts are machined to exacting tolerances.
As the rotors rotate, (male-clockwise as viewed from the
power input end) air is drawn into the cylinder through
the inlet port located at the power input end. A volume of
air is trapped as the rotor lobes pass the inlet cut off
points in the cylinders. Compression occurs as the male
rotor rolls into the female flute, progressively reducing
the space thereby raising the pressure. Compression
continues until the lobe and flute pass the discharge port.
The compressed air is then discharged into the air/fluid
reservoir. There are four complete compression cycles
for each complete rotation of the male rotor.
Compression Cycle
A) INTAKE B) COMPRESSION C) DISCHARGE
INLET PORT
CYLINDER
MALE
ROTOR
FEMALE ROTOR DISCHARGE PORT