When the impeller rotates, the gas enters the impeller axially from the air inlet, is pushed by the blades on the impeller to increase the energy of the gas, and then flows into the guide vanes. The guide vane changes the deflected airflow into an axial flow, and at the same time introduces the gas into the diffuser tube, further converts the kinetic energy of the gas into pressure energy, and finally introduces it into the working pipeline.
The blades of an axial flow fan work similarly to the wings of an airplane. However, the latter applies lift upwards on the wings and supports the weight of the aircraft, while the axial flow fan fixes the position and moves the air.
The cross section of an axial fan is generally a wing section. The blade can be fixed in position, or it can rotate around its longitudinal axis. The angle between the blades and the airflow or the distance between the blades may not be adjustable or adjustable. Changing the blade angle or pitch is one of the main advantages of axial fans. A small blade pitch angle produces a lower flow rate, while increasing the pitch can produce a higher flow rate.
Advanced axial flow fans can change the blade pitch while the fan is running (this is quite similar to a helicopter rotor), thereby changing the flow accordingly. This is called a variable blade (VP) axial fan.
use
The axial flow fan is also called a local fan. It is a kind of fan commonly used in industrial and mining enterprises. But unlike ordinary fans, its motor and blades are in a cylinder, and the shape is a cylinder. It is used for local ventilation and is easy to install. The ventilation effect is obvious and safe, and the air duct can be connected to the designated area.
When the axial flow fan is started, the current of the motor will be 5-6 times higher than the rated value, which will not only affect the service life of the motor but also consume more power. The system will have a certain margin in the motor selection during the design. , The speed of the motor is fixed, but in actual use, sometimes it needs to run at a lower or higher speed, so it is very necessary to carry out frequency conversion transformation. The frequency converter can realize the soft start of the motor, achieve the purpose of energy saving and speed regulation by changing the input voltage frequency of the equipment, and can provide the equipment with protection functions such as overcurrent, overvoltage, and overload.
