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

SECTION 2
Description & Application

Principles of Compression Cycles

Principles of Lubrication Systems

Principles of Cooling Systems

Principles of Dryers & Filters
QP Series
2022201802, July 2014
Quincy Compressor QP Series compressors are heavy duty, air cooled, belt
driven compressors. The QP 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.
Pressure Lubricated Compressors (QP 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. The oil is then
forced under pressure through the oil filter. Oil travels under pressure through
drilled journals in the crankshaft and connecting rods to lubricate crankshaft
bear ings, connecting rod journals, wrist pin bearings and the cylinder walls.
QP compressors are equipped with a compressor sheave with fan blades.
These fan blades force ambient air across cylinder head and intercooler fins
to cool the compressor. These compressors are designed to be operated with
the compressor sheave turning in a counterclockwise rotation (as viewed
"tummy to the sheave").
Moisture occurs naturally in air lines as a result of compression. Moisture
vapor in ambient air is concentrated when pressurized and condenses when
cooled in downstream air piping. Compressed air dryers reduce the moisture
vapor concentration and prevent water formation in compressed air lines.
Dryers are a recommended companion to filters, aftercoolers, and automatic
drains for improving the productivity of compressed air systems.

SYSTEM DYNAMICS

5 3501 Wismann Lane, Quincy Ill. - 62305-3116
Quincy Compressor