Types of Impellers in Centrifugal Fans and Their Applications
Centrifugal fans are a common type of fan. To improve their performance, manufacturers have designed three types of impellers to meet the different needs of users. Here's a breakdown of the differences between the three types of impellers:
1. Forward-curved Impellers
Forward-curved impellers are generally narrow and have a large number of blades. They produce a higher outlet pressure, but their efficiency is lower. Forward-curved impellers are prone to accumulating impurities and scaling between the blades. They are mainly used in applications with moderate airflow but high pressure requirements and are widely used globally.
2. Radial Impellers
Radial impellers have a simple structure and low production costs. Their parameters fall between forward-curved and backward-curved impellers. They have a higher pressure coefficient and lower efficiency, with dynamic pressure accounting for a larger proportion of the total pressure. They are suitable for applications with severe wear and tear, so their application is not very wide. However, due to their anti-fouling characteristics, they are only used in a few cases such as mines.
3. Backward-curved Impellers
Backward-curved impellers have excellent aerodynamic performance, high airflow, and low pressure, but their efficiency is very high. The efficiency of centrifugal fans with backward-curved impellers can reach 80%-90%, so they are widely used. Because of their anti-fouling properties, they are also widely used in industries such as industry, chemical industry, and power plants.
