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Positive Displacement
Delta Blower
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| We Are
Offering Positive Displacement Delta Blower Package Which Is Provided
With Fully Assembled Turnkey Package With 3- Lobe Blower Stage With
Integrated Pulsation Cancellation, Structurally Certified Base With
Integrated Silencer And Fully Automatic Self Tensioning Drive. Available
In 16 Sizes, These Are Tested Stringently For Quality Before Being
Supplied To The Clients. |
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Aerzen positive displacement blower units with
three-lobe rotors and internal pulsation cancellation intake volumes
from 30 m3/hr to 15.000 m3/hr |
| Intake Volume Flow |
From. 30 m3/h to
15,000 m3/h. |
| Pressure Operation |
Up to max. 1000 mbar gauge. |
| Vacuum Operation |
Down to -500 mbar g. |
| Medium conveyed |
Air, inert gas, and bio-gas versions. |
| General Application |
Water treatment, pneumatic conveying, low
vacuum. |
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| Technological
advance for the future The Aerzener Maschinenfabrik GmbH have been
manufacturing Positive Displacement Blowers since 1868. They are amongst
the oldest and largest manufacturers worldwide and are the Market Leader
in Europe. Technical competence, an experienced work force plus a
constant dialogue with the operators ensure that Aerzen and our
customers stay at the forefront of technical development. With the
development of the Delta Blower Packages, the increasing demands of the
market have been achieved. Delta Blower stands for:• Aerzen blower stages
with integrated pulsation cancellation• A concept gained from 30 years
of blower packages production• Minimal surface area required for
installation• Maintenance-free drive components• Discharge silencers,
free of absorption material• Easy accessibility• Quiet - low noise
emission• Energy efficient therefore environmentally friendly to use•
Quality Control certified acc. to DIN ISO 9001 |
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| General Information : |
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Aerzen Positive Displacement Blowers for
oil-free conveying of air and gases
Aerzen Positive Displacement Blowers
(of the "Roots" type design) have been manufactured
since 1868 and today are highly developed standard
production machines designed and adapted to find use in
a wide variety of applications.
Here some examples of applications
for Aerzen Positive Displacement Blowers: |
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Pneumatic conveying of bulk materials
In suction- or discharge pressure. Machine sizes range from
small blowers installed in tank vehicles to very large ones used
in pneumatic elevators for vacuum operated ship unloaders. The
hourly capacity of such unloading installations is up to 1000
tons at present. |
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Pressurized aeration of basins in sewage treatment
plants
Filter flushing blowers in drinking water production plants
Gas boosting blowers rated for internal static pressures of up
to 25 bar.
Steel production
Application in direct-reduction plants. |
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High vacuum boosters
are equipped with special shaft seals. |
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Conveying of practical all gases
found in the chemical, petrochemical, and metallurgical
industries. Special designs are available to handle aggressive
gases. Machines used in both conventional and nuclear power
plants comply with the various categories of safety regulations
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| Operating Principle : |
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Two symmetrical rotors convolute in opposite
directions. The medium to be conveyed flows into the
housing surrounding the rotors, and is displaced in
a positive manner from the inlet to the discharge
side via the chambers formed between the rotors and
the housing. At the very moment the rotor tip clears
the edge of the pre-inlet channel, the volume of the
gas displaced is compressed by the backflow of the
pressurized gas present in the conveying piping at
the discharge socket. The final pressure
automatically adjusts itself to the pressure level
in the
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downstream piping and components. The flow required to
convey all types of gases under various operating conditions
can be calculated once specific blower data are known. Each
rotor revolution results in the displacement and compression
of the so-called scoop volume qo (litre/revolution).
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Operating reliability and safety
Aerzen positive displacement blowers are produced
by highly skilled and experienced professionals, and are not
delivered prior to having been thoroughly tested. Each and
every blower is subjected to a test run lasting several
hours under conditions of increased load. A test record is
prepared with all data which will still be available years
later.
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| Characteristics : |
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Oil-free conveying
The fact that Aerzen positive displacement
blowers convey the medium oil-free is a decisive
advantage in pneumatic conveying, in water
filtration plants, and in the food and chemical
industries. Since the rotary pistons revolve without
making contact with each other and the housing, no
lubrication is required in the conveying chamber,
which guarantees that the medium conveyed remains
free of contamination from lubricants and wear
particles.
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Wide range of selection
The extensive number of models and sizes available
facilitates the selection of the optimal machine for any
given application. Machines handling capacities ranging from
approx. 30 m³/h to approx. 84000 m³ /h in either vertical or
horizontal flow configuration can be supplied.
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Drive types
Blowers are driven by electrical motors, internal
combustion engines, hydraulic or compressed air motors via
flexible coupling (arrangement 4, DA), flanged motor B 5
(for HV-blowers) V-belt drive (arrangement 5, FA) Reducer
drive, shift gear transmission or variable speed drive
(arrangement 6,6h).
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Conveying based on the positive displacement
principle
The inlet flow volume varies only slightly
in response to changes in back pressure. Blower
output can be adapted in the swept volume to the
operating conditions simply by varying its speed.
High mechanical efficiency
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Since the rotary pistons revolve without making contact,
mechanical power losses are generated in the bearing and
timing gear assemblies only. The use of ball and roller
bearings as well as tempered and ground timing gears reduces
these losses to an absolute minimum. Furthermore it is
advantageous that the helical gearing offers a running of
low noise.
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High volumetric efficiency
The rotary pistons and casing components are
manufactured using modern CNC-controlled precision machine
tools, guaranteeing exact tolerances even in the large scale
production of standard components. This is reflected in the
minute clearances both between the rotors as well as between
the rotors and the housing, resulting in very high degrees
of volumetric efficiency.
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| Construction and Design : |
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Construction and design - Aerzen Positive
Displacement Blowers
Are twin shaft rotary machines. The two rotors are
placed axially parallel to each other and centered within
the housing. Timing gears ensure that the rotors revolve
without making contact. The rotors are supported on ball and
roller bearings. In order to achieve a high efficiency the
clearance between the rotors is kept to a minimum and is
based on the pressure differential and thermal load expected
under operating conditions. In case of larger blowers the
roller bearing clearances and the shaft deflection have an
influence on the clearance. Larger clearances between the
rotors and the end plates compensate for axial thermal
expansion at the floating bearing end.
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Housing
The housings are made of high quality grey cast
iron (GG 20). The blower housing requires no additional
cooling, even at high loads. Up to the size GM 80L, the
blower feet are bolted on.
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Sealing configuration, series GL and GM
These models are designed to convey air or neutral
gases. The conveying chamber is sealed from the oil chambers
by means of an oil slinger in conjunction with piston ring
labyrinth type seals featuring a generously dimensioned
central vent chamber (condensate channel), and which plays a
crucial role in ensuring that the medium conveyed remains
clean and oil-free. The drive shaft is sealed by means of a
radial seal ring installed in the housing cover.
Special designs possible at any time.
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Rotors
The rotors are dynamically balanced. Smaller
blowers of the sizes GM 3 S - GM 80 L feature steel rotors
and shafts (C 45 N), drop-forged in one single piece. Sizes
GM 90 S and larger are constructed with pistons made of GGG
40 and steel shafts (C 45 N). Where contamination particles
are likely to accumulate during operation, the cavities of
the cast iron rotors are capped.
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Timing gears
The helical timing gears are tempered, and then
ground to an exacting degree of precision. The positioning
and fastening of the gears onto the shafts takes place via
taper interference fit, guaranteeing both excellent
concentricity and reliable adherence.
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Special materials
Non-standard materials such as nodular graphite
cast iron (GGG 40), cast steel (GS - C 25) and CrNi - cast
steel are available for special applications. Special
requirements, however, must be clarified with the
manufacturer in advance!
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Accessories
Our blower units normally include the standard
accessories for continuous operation. The installation is
effected on flat, load bearing surfaces, elevated floors or
steel structures, a rigid installation on concrete
foundations is also possible. In most cases the blowers are
driven by a three-phase asynchronous motor and - for
adjustment of the volume flow - a belt drive. Upon demand
special designs as direct coupling, intermediate spur gear
or special materials are also available.
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