What are Industrial Centrifugal Blowers?
Industrial centrifugal blowers are machines that are used to adjust the flow of gas for ventilation, exhaust, cooling and conveying purposes. They are either electro-mechanical or mechanical. They are most commonly driven by motors, but can also be run with the help of engines. Centrifugal blowers direct a heavy gas flow towards the required part of the building, with the help of inbuilt blades or impellers.
USES
Blowers are used for cooling purposes and to increase the flow of air when required, in engines. They are also used in drying processes and in dust control in fluid bed aerator systems.
Types of Centrifugal Blowers
Industrial centrifugal blowers can be categorized according to their capability of producing pressure – High-pressure, low pressure and medium pressure blowers.
They can also be classified according to their usage. If a constant flow is needed, a single stage centrifugal blower is used. If mixed airflow is needed while keeping the pressure constant, a multi-stage blower is preferred.
A third type of classification is the direct drive and belt drive blower.
Belt drive blower: The advantage is that one can use a wide variety of airflows and it can be used along with a changing pitch motor pulley.
Direct drive blower: These are more cost effective, easier to put together, more efficient in their functioning, more consistent and require very little maintenance. With the help of a variable frequency drive, they can function just as flexibly as a belt drive, thus making them the blower of choice.
Type of Blades:
One can choose between a wide variety of blade alignments such as radial, air foil, forward curved and backward curved.
Radial blades: These integrate medium airflow and high pressure. In areas where there is high moisture content and dust in the air, centrifugal blowers with radial blades are the best.
Forward curve blades: These are more versatile as they can function in ventilating, exhaust and clean air environments.
Backward curve blades: They are highly efficient, require high power and high flow. When the flow rate surges, the power consumed becomes less, which is advantageous.
Air foil: Of all the blades, these fans are the most effective and work best in clean air environments.
Advantages of Centrifugal Blowers
Industrial Centrifugal blowers are favoured over other blowers with the same dimensions as they can be used at much higher speeds, can withstand much greater pressure and have the capacity to move bulk quantities of wind at different pressures, quite easily.
They are reliable and quiet, have a much higher horsepower, while maintaining the damages to the motor and overloading at a minimum.
The blowers are also customizable according to different requirements.
Industrial Centrifugal blowers are favoured over other blowers with the same dimensions as they can be used at much higher speeds, can withstand much greater pressure and have the capacity to move bulk quantities of wind at different pressures, quite easily.
They are reliable and quiet, have a much higher horsepower, while maintaining the damages to the motor and overloading at a minimum.
The blowers are also customizable according to different requirements.
Factors to be considered while buying Centrifugal Blowers
The major factors that need to be kept in mind while buying a centrifugal blower are flow capability, design of the port, type of blower, overall dimensions and electrical ratings. Ducts that have a complex structure and are longer need a more potent blower, thus impacting the cost. Environmental factors to consider while buying centrifugal blowers
Environmental factors also need to be looked at, as different environmental conditions require centrifugal blowers of different material.
Harmful environments: Radial blowers are the centrifugal blowers of choice
Outside or Unclean Environment: Totally Enclosed Fan Cooled (TEFC) motors are best suited.
Clean environments: Backward curve, Air foil or forward curve blowers can be used.
Humid and wet surroundings: Stainless Steel blowers are preferred.
Inflammable environments: Non-sparking blowers fitted with an explosion-safe motor can be used.
High temperature: Belt drive blowers can withstand higher temperatures up to 250°F, beyond which a heat slinger needs to be incorporated.
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