Air-End is the heart of screw compressors. It compresses air by displacing
between male and female rotors and Air-End's housing walls. Also, it is called as
"screw" because of it's rotors are like as screws.
Air-End Running Principle:
Male rotor rotates by power of drive motor via belt-pulley or coupling. While
male rotor rotates on counter clockwise (by looking from front of the
air-end), it forces female rotor to rotate on clockwise. Rotation of the
rotors in housing walls, displaces air from suction port to delivery port.
Displacement of the chambers which are formed by rotor and housing
walls, graduatally reduces their volume size in air flow direction and air
becomes compressed by reducing the volume up to the delivery point.
- Oil injected
into the air-end for providing of compression by sealing of spaces
between rotors and housing walls. Also, oil lubricates rotor bearings and
absorbes compression heat in the air-end.
The oil cooler rejects the heat in circulated oil and reduces oil temperature
to normal, again. For these 3 functions, oil viscosity and other oil
parameters must be proper for continuous circulation in normal running
temperatures with minimum power losses.
m3/min to 28.5 m3/min
- from 4 bar to
kW to 160 kW
Running of TAHSER Compressor Units:
- When the compressor unit has been started, the compressor
runs off load till the main motor completes it's startup.
Then, the suction regulator's air intake valve opens and
the compressor begins to run on load.
When the system pressure reaches to minimum output
pressure level, minimum pressure valve opens and
compressed air passes to the unit's outlet. While running on load, if
the output air pressure increases to the upper
limit, suction regulator's air intake valve closes and the
compressor begins to runs off load. In this phase, there
is no compressed air delivery from the minimum pressure
valve. And, there is only an internal circulation air
pressure before the minimum pressure valve, in the sytem.
When the output air pressure decreases to lower limit, the
compressor unit loads itself again, begins and continues
to running on load till the next upper limit signal
occurence. Also, upper limit pressure is called as maximum
working pressure. As a safety addition, there is an over
pressure switch circuit which stops running of the
compressor if the system pressure overs maximum working
pressure setting due to any control failures. In Tahser
compressor units, pressure values are monitored by
transducers which send analog signals to the PLC. The PLC
performs required function depending on analog signal
which represents related pressure values. In addition to
analog pressure inputs, a pressure switch is used as over
pressure saffety device which sends on/off signal directly
to the controller. Also, an analog signal based
temperature monitoring is performed to protect system
against over working temperatures etc.