Blower Operating Principle
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Main components of the blower are, two figure–8
shaped impellers (also referred as rotors or lobes).
These impellers rotate in oppposite directions. As
they rotate, a fixed quantity of gas at the inlet
side is trapped between the impeller and the casing.
The rotating impeller pushes the trapped gas to the
discharge side against whatever pressure exists in
the system. The cycle repeats four times with every
revolution. The three lobe blowers have the same
operating princble. |
Gas Compression
Rotary
positive displacement pump, also referred to as positive
displacement (PD) blowers or roots blowers, are machines
that "pushes" a relatively constant volume of gas through a
system. Unlike compressors, a roots blower does not
internally compress the gas. The compression is achieved
through the blower pushing the constant volume against
restrictions downstream in a pressure system. Flow through a
PD machine is relatively constant, regardless of pressure
changes. This is different from a centrifugal compressor,
which maintains a relatively constant pressure while the
flow varies.
Oil-Free Conveying
Since
blower impellers do not make contact with each other and
housing, no lubrication is required in gas conveying
chamber. Therefore there exists no extra material in the
conveying medium. This feature makes roots blowers have a
great advantage in applications that require clean air or
gas like aquaculture, milling, pneumatic conveying of foods
and, chemicals.
Drive Types
Blowers
are driven by electrical motors, internal combustion engines
and hydraulic motors. Flexible couplings, V-belt drives,
speed reducers can be used to make connection betwen blower
and drive.
Blower Packages
For an
easy installation option, blowers can be prepared within a
package unit which contains electrical motor, silencers and
other accessories.
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