Sullivan-Palatek 15D, Руководство пользователя

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28 COMPONENT DESCRIPTION
3.1 AIR COMPRESSOR PACKAGE
The air compressor package consists of a rotary screw compressor unit, air-cooled lubrication and cooling
system, discharge system, intake and capacity control system, and monitoring system.
3.2 COMPRESSION CYCLE
During operation, two helically-grooved rotors mesh to compress air. Intake air is compressed as the male
lobes roll down the female grooves, pushing trapped air along, compressing it until a female groove uncovers
the discharge port in the end of the stator and delivers smooth-flowing, pulse-free air to the receiver.
Atmospheric air fills in behind the male lobe, preparing the female groove for another compression cycle as
rotation continues and the male lobe again meshes with the female groove.
FIGURE 3-1.
COMPRESSION CYCLE
3.2.1 COMPRESSOR UNIT
The compression cycle takes place within the compressor unit (also referred to as an air end). The
compressor unit is a lubricant-flooded, positive displacement, single-stage rotary screw air end, designed to
achieve the desired operating pressure. The compressor unit’s main components include a stator housing,
discharge housing, male and female rotors, bearings and seals.
3.3 DRIVE SYSTEM
When started, the main motor starter contacts are pulled in and power is supplied to the motor. Power is
transferred from the motor to the compressor unit by the drive coupling to bring the compressor unit up
to operating speed. An adapter housing self-aligns the motor and compressor unit. The power status and
modes of operation are controlled through the starter assembly.
3.3.1 DRIVE MOTOR
The drive motor is the main electrical motor that powers the compressor unit. The electric motor is three-
phase induction type supplied with a C-flange that bolts directly to the motor/compressor adapter. Standard
motor configuration is a NEMA Premium ODP design. Optional motor configurations are available upon
request.
3.3.2 DRIVE COUPLING
The drive coupling transfers power from the drive motor to the compressor unit. The drive coupling consists
of two coupling halves (one for the motor shaft and one for the compressor unit shaft) and a replaceable
spider coupling element.
3.3.3 STARTER (ELECTRICAL CONTROL PANEL)
The starter (also referred to as the electrical control panel) is an amp-rated assembly designed to match the
compressor motor ratings for the supplied incoming power voltage. The standard starter enclosure is NEMA
1 (other NEMA ratings are optional). The enclosure houses the required electrical controls and fan starter
contacts, located at the left-side corner of the package for easy access. Optional wye-delta, solid state and
VFD starters are available upon request.
3.4 PROTECTIVE DEVICES
The compressor package is equipped with several safety devices to protect the equipment and the end user.
A pressure relief valve is mounted on the sump tank to prevent the compressor package from exceeding
the rated pressure of its components. Temperature and pressure switches will shut the compressor down if
temperature or pressure limits are exceeded.
3.4.1 RECEIVER OVER PRESSURE (ROP) SWITCH
This switch is supplied to protect the package in case the pressure in the sump tank exceeds the rated
pressure. This switch is the first line of protection in the system, followed by the tank relief valve. The switch
body is located in the electrical enclosure.