Sullair Compressor Unit, Functional Description; Compressor Cooling And Lubrication System, Functional Description - Sullair 900XH Operators Manual And Parts Lists

Section 2
DESCRIPTION
blies of the Sullair 900XH-1350XH Open Frame Air
Compressors models are clearly shown. The pack-
age includes a compressor unit, diesel engine,
compressor inlet system, compressor cooling
and lubrication system, compressor discharge
system, capacity control system, instrument
panel and electrical system.
pressor unit is driven by an industrial engine
designed to provide enough horsepower for more
than adequate reserve at rated conditions. Refer to
Engine Operator's Manual for a more detailed
description of the engine.
The engine cooling system is comprised of a
radiator, high capacity fan and thermostats. The
high capacity fan draws air through the radiator,
keeping the engine at the proper operating temper-
ature.
The same fan also cools the fluid in the compressor
cooling and lubrication system. Prior to passing
through the radiator, the fan air also passes through
the compressor fluid cooler (which is mounted adja-
cent to the radiator). As air passes through the
cooler, the heat of compression is removed from the
fluid.
The same fan also cools the engines intake air sup-
ply. Prior to passing through the radiator and oil
cooler, the fan air passes through an air to air after-
cooler. As air passes through the air to air after-
cooler heat is removed which was introduced by the
engine's turbo charger. The engine is coupled to
the compressor unit with a non-lubricated vulcan-
ized rubber disc and drive flange-type coupling.
On open frame compressors supplied without fuel
tanks, the customer is responsible for providing
fuel supply.
2.3 SULLAIR COMPRESSOR UNIT, FUNCTIONAL
DESCRIPTION
Sullair compressors feature the Sullair compressor
unit, a two-stage, positive displacement, flood lubri-
cated-type compressor. This unit provides continu-
ous compression to meet your needs. With a Sullair
compressor, no maintenance or inspection of the
internal parts of the compressor unit is required with
the warranty.
Fluid is injected into the compressor unit and mixes
directly with the air as the rotors turn, compressing
the air. The fluid flow has three basic functions:
1. As coolant, it controls the rise of air temperature
normally associated with the heat of compres-
sion.
2. Seals the leakage paths between the rotors and
10
3. Acts as a lubricating film between the rotors
After the air/fluid mixture is discharged from the
The Sullair com-
compressor unit, the fluid is separated from the air.
At this time, the air flows to your service line and the
fluid is cooled in preparation for re-injection.
2.4 COMPRESSOR COOLING AND LUBRICATION
SYSTEM, FUNCTIONAL DESCRIPTION
Refer to Figures
(Aftercooled). The compressor cooling and lubri-
cation system is designed to provide adequate
lubrication as well as maintain the proper operating
temperature of the compressor. In addition to the
cooler and fan, the system consists of a main fil-
ter, fluid stop valve and thermal valve.
Fluid is used in the system as a coolant and a lubri-
cant. The fluid is housed in the receiver/sump which
from this time on will be referred to as the sump.
Upon start-up, the temperature of the fluid is cool
and routing to the fluid cooler is not necessary. The
fluid, taking the path of least resistance, flows to the
thermal valve.
The thermal valve has two entrance ports and two
exit ports. The entrance ports will be referred to as
Port A and Port B. Port A accepts fluid from the
sump and Port B accepts fluid from the cooler. The
exit ports will be referred to as Port C and Port D.
Port C routes fluid to the cooler and Port D routes
fluid to the compressor.
As previously stated, upon start-up, the fluid tem-
perature is cool, and routing to the cooler is not
required. The fluid first enters the thermal valve
through Port A and then flows on to the compressor
unit through Port D, bypassing the cooler. As the
compressor continues to operate, the temperature
of the fluid rises and the thermal valve element
begins to shift. This forces a portion of the fluid to
the fluid cooler through Port C. The cooler is a radi-
ator-type that works in conjunction with the engine
fan. The fan draws air through the cooler removing
the heat of compression from the fluid. From the
cooler, the fluid is routed back to the thermal valve,
entering at Port B. Before the temperature of the
fluid becomes high enough that Port A is complete-
ly shifted, cooled fluid entering at Port B is mixed
with warmer fluid entering at Port A. When the tem-
perature of the fluid entering at Port A reaches
210°F (99°C), the thermal element shifts complete-
the stator and also between the rotors them-
selves.
allowing one rotor to directly drive the other,
which is an idler.
2-2 and 2-3A (Standard) or 2-3B