Is
there are difference between the screw
compressor and the rotary screw compressor?
The
screw compressor was first developed to meet
the needs of the construction and mining industries.
The first screw compressor was actually made
in the 1930’s. The rotary screw compressor
is actually the same thing as the screw compressor
and is widely used for many different applications.
The most common screw compressor is the single
stage compressor. This compressor consists of
two rotors inside a casing and the rotors compress
the air internally. There are no valves in these
rotary screw compressors. The units are cooled
with oil, which seals the internal clearances.
The single stage rotary screw compressor is easy
to maintain and operate.
How the Rotary Screw Compressor Works
The
basic element of the rotary screw compressor
is the airend, the housing with the enclosed
rotor assemblies.
The main rotor has a form that fits into grooves
called the female or gate rotor. The airend uses
a flood of coolant to lubricate seal and cool
the compressed air. This is why we get cool air
from an air conditioner.
When the rotary screw compressor starts, air
is drawn into the pockets that are opened between
the main rotor lobe and the female rotor grooves
located at the intake end of the compressor.
As the rotation continues, the leading strip
of the main rotor lobe reaches the female rotor
grooves and traps the air in the pockets. As
the air moves down the female grooves, it is
compressed.
Reasons to use rotary screw compressors
Rotary screw compressors are very popular for
many reasons. Some of these reasons are:
- They
are designed to provide pulsation free air
24 hours a day.
- They
are able to work continuously.
- They
run quietly.
- They
are energy efficient even when running at full
capacity.
- They
do not require a lot of service.
- They
are built to last
- The
air compressed is pure air.
A rotary screw compressor costs a lot of money
in electricity to keep it running. However, there
have been many advancements in this field, so
that now you can purchase an energy efficient
screw compressor.
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