System Dynamics; Description & Application; Principles Of Compression Cycles; Principles Of Lubrication Systems - Quincy Compressor Industrial Series Instruction Manual

SECTION 2 SECTION 2
SECTION 2 SECTION 2 SECTION 2
Description & Application

Principles of Compression Cycles

Principles of Lubrication Systems

Industrial / Air Master Series
50161-105, March 2008
Quincy Compressor QT Series and PLT Series compressors are heavy duty, air
cooled, belt driven compressors. QT Series two stage compressors are splash
lubricated and capable of delivering 175 PSIG of compressed air. The PLT
Series compressors are pressure lubricated and capable of delivering 175 PSIG
of compressed air.
Two Stage Compressors
During the downstroke of the piston of a two stage compressor, air is drawn
through an intake valve in the head of the compressor into the low pressure
cylinder and compressed during the upstroke of the piston.
The compressed air is then released through a discharge valve in the head
of the compressor to an intercooler (usually finned tubing) where the heat
resulting from compression is allowed to dissipate. The cooler compressed air
is then drawn into a second compression cylinder, the high pressure cylinder,
for compression to final pressure.
From there the compressed air is released through a discharge valve to an
air receiver tank or directly to a network of compressed air supply lines. In one
revolution of the crankshaft a compression cycle is completed.
Splash Lubricated Compressors (QT Series)
With each stroke of the compressor, a dipper attached to the bottom of the
connecting rod , dips into an oil bath at the bottom of the crankcase. This dipper
splashes oil throughout the interior of the crankcase, lubricating all moving
parts.
It is important with this system that the correct oil level be maintained. If
the oil level is too high, excessive oil carryover could result. If the oil level is too
low, or the compressor is not operated within the correct RPM range, the
moving parts will not be adequately lubricated.
Pressure Lubricated Compressors (PLT Series)
Moving parts within the crankcase are supplied with lubrication by a positive
displacement, gerotor type oil pump. Oil is drawn up from the bottom of the
crankcase to the oil pump through an oil sump strainer screen. Oil travels
under pressure through drilled journals in the crankshaft to lubricate crank-
shaft bearings and connecting journals.
Optional Low Oil Level Switch
QT-5, PLT-5, QT-7.5, PLT-7.5 & QT-10 compressors are available with an
optional low oil level switch. A separate instruction manual is available which
explains the operation, retrofit installation, and removal for inspection of the
low oil level switch. Request instruction manual # 112210-101.
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SYSTEM DYNAMICS

SYSTEM DYNAMICS
SYSTEM DYNAMICS SYSTEM DYNAMICS SYSTEM DYNAMICS
Quincy Compressor
3501 Wismann Lane, Quincy Ill. - 62305-3116