Design Considerations and Applications For Industrial Blowers

Industrial blowers are mechanical devices that can move gas or air and are used in several industrial processes in addition as applications that require enhanced gas or airflow. Increased airflow is achieved by the rotation of a fan wheel consisting of several fan blades. This fan wheel accelerates the air entering the blower housing and pushes it out by the housing exit, consequently supplying air to the applications. The fan wheel is typically rotated by an electric motor or a turbine. There are two types of blowers, centrifugal and axial, which are classified based on the direction of the airflow. Based on your application, a variety of blower design options is obtainable, and the blower should be chosen such that it offers long and efficient sets.

Design Aspects

There are several aspects to be considered while designing industrial blowers, with the dominant focus being on the application that the blower is being chosen for. Specific flow and pressure requirement of the application are the dominant factors taken into explain blower design. Another factor to be considered is the application’s airflow characteristics, such as whether the blower will function in an abrasive ecosystem. A typical component in designing the centrifugal machines is to function the units with operating pressure in a thin range. While designing a blower, it is necessary to ensure that eddies and turbulence in the blower housing are also restricted, consequently keeping blade use to a minimum. Large and fast fans consequence in increased force acting on the rotating structures; as a consequence the blower should also be designed such that capricious resonant frequencies and excessive stress are deleted.

Blower Selection and Installation

Generally, the selection of blowers is based on its longevity, performance, and efficiency. However, the noise characteristics of the blower are also taken into consideration, especially in situations where the blowers are used in HVAC systems. While installing the blower, it is important that it be installed on a stiff base to prevent resonance.

Blade Selection

Various blade types and configurations are obtainable for industrial blowers, be it a centrifugal or an axial fan.

The dominant blade configurations for a centrifugal blower are radial, forward inclined, and backward inclined. All of these blade configurations have pros and cons, and they should be chosen based on the application.

Radial fans offer high pressure, high speed, and low quantity airflow, making them ideal for pneumatic conveying systems in addition as vacuum cleaners. In addition, its low sensitivity to solids also makes it particularly suited for applications with particulate-filled gas flows. Forward inclined fans are typically obtainable with both flat and curved blades. These fans are ideal for low pressure, high quantity applications. Backward inclined fans, however, offer better efficiencies and are better disposed to manager airflows with moderate particulate loading. They are particularly ideal for applications that require high pressures and medium flow.

Axial fans are obtainable with variable pitch blades. In this kind of fan, the pitch of the blade is regularly changed to suit the pressure and quantity requirements of the application. Another variation of this kind is the “on-the-fly” variable pitch, in which the blade pitch can be changed while the rotor is rotating. This option offers axial fans a versatility that makes them ideal for a general spectrum of airflow applications.

Flow Control

In certain applications, flow control will also be a requirement. In such situations, a method of flow control must be chosen. The two dominant methods of controlling flow are speed variation and industrial dampers. Speed variation is achieved by controlling the speed of the driver. For this purpose, use an adjustable frequency AC controller, a hydraulic variable speed excursion unit, plus a DC motor and excursion. Industrial Dampers, however, control flow by restricting airflow. There are a variety of dampers obtainable for use with industrial blowers, including radial inlet dampers, louvered inlet box dampers, and release dampers.

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