Functions and Characteristics of the Collector, Volute, and Inlet Guide Vanes in Explosion-Proof Centrifugal Fans

Functions and Characteristics of the Collector, Volute, and Inlet Guide Vanes in Explosion-Proof Centrifugal Fans

During operation of explosion-proof centrifugal fan units, gas can be introduced into the impeller via two methods: direct atmospheric suction or free suction.

The other method involves introducing air through a suction pipe or air box. Regardless of the intake method used, a corresponding air collector must be installed before the impeller of the explosion-proof centrifugal fan.

The primary reason for installing this component is that, during the operation of the explosion-proof centrifugal fan unit, its function is to evenly distribute the airflow to the inlet section of the impeller, achieving the required inlet velocity and ensuring minimal airflow loss as it enters the impeller.

Currently, numerous collector types exist, including cylindrical, conical, and arc-shaped designs. Among these, arc-shaped collectors exhibit high performance and are employed in large fans to enhance efficiency.

Similarly, in explosion-proof centrifugal fan units, the vortex is a critical component. Its primary function is to collect the airflow at the impeller outlet, guide it toward the fan outlet, and convert part of the airflow's kinetic energy into pressure energy.

The vortex shape typically follows a logarithmic spiral or Archimedean spiral, offering high efficiency. Under normal conditions, the gas exiting the vortex retains relatively high velocity. To effectively utilize this energy, a diffuser is usually installed at the vortex outlet.

Generally, the vortex outlet of explosion-proof centrifugal fans features a drill-like structure, known as a vortex drill, which prevents gas recirculation within the housing.

Fans with vortex-shaped tongues typically operate more efficiently.

Furthermore, the inlet in front of the impeller in explosion-proof centrifugal fans often incorporates guide vanes that adjust the flow angle to regulate fan airflow.

These guide vanes are referred to as guide vanes, directing vanes, or guide blades.

The inlet guide adjustment method is widely adopted in explosion-proof centrifugal fans.