Section 2
DESCRIPTION
5
2.1 INTRODUCTION
Your new Sullair flood---lubricated rotary screw air
compressor will provide you with improved reliabil-
ity and greatly reduced maintenance.
Compared to other types of compressors, the Sul-
lair rotary screw is unique in mechanical reliability,
with “no wear” and “no inspection” required of the
working parts within the compressor unit.
Read Section 6 (Maintenance) to keep your com-
pressor in top operating condition. Should any
questions arise which cannot be answered in the
following text, call your nearest Sullair office or the
Sullair Corporation Service Department.
2.2 DESCRIPTION OF COMPONENTS
Refer to Figure 2---1. The components and assem-
blies of the ES---6 Series air compressor are clearly
shown. The complete compressor consists of an
encapsulated compressor sys tem , inlet sys-
tem, cooling system and control system.
The compact design of the ES---6 Series air com-
pressor provides easy access to all serviceable
components.
2.3 ENCAPSULATED COMPRESSOR SYSTEM,
FUNCTIONAL DESCRIPTION
Refer to Figure 2---2. The encapsulated compres-
sor includes compressor unit, fluid management
system, and motor s ection. The Sullair compres-
sor unit is a single---stage positive displacement lu-
bricated type compressor. This unit is equipped
with tapered roller bearings on the discharge, and
cylindrical roller bearings on the inlet end for high
load carrying capacity. This unit provides continu-
ous pulse---free air compression to meet your
needs. With a Sullair compressor there will be no
maintenance or internal inspection of the compres-
sor.
WARNING
!
DO NOT remove caps, plugs and/or other compo-
nents when compressor is running or pressur-
ized.
Stop compressor and relieve all internal pres-
sure before doing so.
Fluid is injected into the compressor unit in large
quantities and mixes directly w ith the air as the ro-
tors turn, compressing the air. The fluid flow has
three main functions:
1. As coolant, it controls the rise of air temperature
normally associated with the heat of compres-
sion.
2. It seals the leakage paths between the rotors
and the stator and also between the rotors
themselves.
3. It acts as a lubricating film betw een the rotors al-
lowing one rotor to directly drive the other, which
is an idler.
The air/fluid mixture discharges directly into the
fluid management system.
The fluid cooler bypass valve helps assure proper
cooling by directing the fluid to the fluid cooler
when discharge temperature reaches the thermo-
stat temperature setting.
During start ---up in cool ambient conditions, the
cooler pressure drop will cause the filter bypass
valve t o open up, assuring adequate fluid supply to
the compressor.
All fluid entering the compressor unit passes
through the replaceable fluid filter element. This re -
placeable filter element contains a built---in bypass
valve. Under conditions of restricted flow through
the element, the bypass valve helps ensure ade-
quate compressor fluid flow, as well as helps pre-
vent element failure.
FLUID MANAGEMENT SYSTEM
The fluid management system consists of a multi---
chambered primary/secondary separator, the fi-
nal air/fluid separator element, cooler bypass
group and fluid filter.
As compressed air/fluid enters the sump, the first
fluid separation takes place due to a reduction of
flow speed coupled with a change of direction of
the flow within the sump housing. Then the com-
pressed air reaches the separator, where the finest
fluid drops and mist are separated.
MOTOR/DRIVE SECTION
The motor/drive section consists of a squirrel cage
induction motor and integrated drive gearing which
is separated from the motor by a replaceable shaft
seal.
The minimum pressure/discharge check valve is
mounted on the compressor drive housing. Its
functions are as follows:
1. Maintain a minimum sump pressure of 4.1 bar
under full load operation t o help assure ade-
quate fluid pressure.
2. Act as a check valve to isolate the compressor
from the system at s hutdown or unload.
2.4 COMPRESSOR COOLING SYSTEM, FUNC-
TIONAL DESCRIPTION
The compressor cooling system consists of a fluid
cooler, fan and cooler shroud.
The fan is mounted on the motor’s shaft end oppo-
site the compressor. Air is drawn over the motor as
well as through the cooler. The air provides motor
cooling and removes compression heat from the
fluid.
2.5 AIR INLET SYSTEM, FUNCTIONAL DESCRIP-
TION
The compressor inlet system consists of a dry--
type air filter and an air control valve.Reactingon
a pressure signal, the valve closes the intake for un-
loaded operation. The valve also acts as a check
valve upon shutdown.
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