Rogers GPKD-1550-H, Инструкция по эксплуатации, Страница: 6 / 49

6
1. General Description
1.1. Compressor
The Rogers KNW Series air compressor is a heavy duty, two-stage, rotary screw
design that provides completely oil-free compressed air. Oil-free compressed air is
guaranteed by a unique seal arrangement that separates the bearings and gear
chambers from the compression section of each stage. The dual vent seal design
ensures that no oil or its vapor can contaminate air that is being compressed.
The two-stage design provides higher output pressures at a lower operating temperature
than would be available from a single-stage design. Both compressor stages are
mounted on a heavy-duty cast-iron gear case for permanent alignment. The stages are
driven through precision machined gears, selected for optimum operating speed to
maximize efficiency and reduce rotor thrust. Timing gears are used to separate the
rotors and to assist in reducing thrust on the rotors and the rotor bearings, thus
extending bearing life.
Flange-mounted, permanently aligned, drive motor and compressor elements; coolers
and piping; self contained lube oil system; compressor operating and safety controls,
and related accessories, are mounted inside a sound attenuating steel cabinet. All
compressor mounting points inside the cabinet are vibration isolated. Flexible
connections between the compressor assembly and the cabinet ensure that no vibration,
or related noise, is transmitted to the cabinet. The result is a very stable and quiet
running package.
The KNW Series compressor includes a separately driven oil pump for drive gear, timing
gear, and bearing lubrication. The compressor lube oil pump starts first, then, after oil
pressure is established, the Diesel engine starts. Starting of the drive motor is delayed
allowing pressurized lubrication of the bearings and gears during acceleration of the
compressor. The pump is also timed to stop after the compressor so that oil pressure is
maintained while the compressor coasts to a stop. Maximum component life is assured
by thorough lubrication of moving components.
Another feature of the KNW Series air compressor is the capacity control system which
controls discharge air pressure by regulating compressor air flow. A direct acting 4-way
solenoid valve, constructed for dry air service, controls the position of the capacity
control valve (CCV). The CCV is a unique design which controls both the inlet air flow
and discharge bleed-off, uses few moving parts, and provides for extended service
intervals. See section 1.5 for a detailed description of the capacity control system.
The Rogers KNW Series compressor operator panel is a state-of-the-art control system
combining robust industrial controls with leading edge Human-Machine Interface (HMI)
and Programmable Logic Controller (PLC) technology. The HMI is a versatile
touchscreen display with color graphics and user-friendly operation. The HMI shows all
necessary compressor information in an easy-to-understand format.