Axial flow fans and mixed flow fans are very similar in appearance, and ordinary people cannot tell the difference between them with the naked eye. So, how to distinguish between axial flow fans and mixed flow fans?
1. Different Concepts
Axial flow refers to the airflow parallel to the axis of the fan, such as an electric fan. The housing has an open inlet and has a quarter turn curved shape. The motor can be placed vertically outside the pipe. The impeller of a mixed flow fan allows centrifugal and axial movement of the air. The movement of air in the housing is a mixture of axial and centrifugal motion, hence the name "mixed flow".
2. Different Features
The wind pressure coefficient of the mixed flow fan is higher than that of the axial flow fan, and the flow coefficient is also larger than that of the centrifugal fan. It is used where wind pressure and flow are "neither too large nor too small". It effectively fills the gap between the axial fan and the centrifugal fan.
3. Different working principles
When the impeller of the axial flow fan rotates, the gas enters the impeller axially from the air inlet, and is pushed by the blades on the impeller, the gas energy increases continuously, and then flows into the guide vane. The guide vane converts the deflected gas into axial flow, and introduces the gas into the diffuser, further converts the kinetic energy of the gas into pressure energy, and then enters the working pipe. Axial fans are usually used in applications with high flow requirements and low pressure requirements.
A mixed flow fan is a fan between an axial flow fan and a centrifugal fan. It combines the characteristics of axial fans and centrifugal fans, and is similar to traditional axial fans. The enclosure can have an open entry, but more commonly, it has a right-angled bend shape so that the motor can be placed outside the duct.
