Axial fan, the use of a very wide range, that is, with the fan axis of the same direction of the air, such as electric fans, air conditioning fan is the way the fan running fan. It is called "axial flow" because the gas flows parallel to the fan shaft. Axial fans are often used in situations where the flow rate is high and the pressure is low. The axial fan is fixed and moves the air. Axial fans are mainly composed of fan impellers and housings. The structure is simple but the data is very high.
Ordinary axial fans can be used in general factories, warehouses, offices, residential and other places of ventilation, can also be used for chillers (air coolers), evaporators, condensers, spray down, and so on, there are mining shaft Flow fan,
Anti-corrosion, explosion-proof axial fan with anti-corrosion materials and explosion-proof measures, and match the explosion-proof motor can be used to transport explosive, volatile, corrosive gas,
Require the axial flow of the fan should be no significant dust, no sticky and fiber material; motor direct-type temperature does not exceed 40 ℃, belt drive temperature does not exceed 60 ℃. The amount of dust transported to the gas shall not exceed 150mg / m3,
Axial fan is mainly composed of impeller, chassis, motor and other components, the use of steel and the stent duct connection. One of the anti-corrosion type axial fan impeller, the chassis are made of glass fiber reinforced plastic, other types of axial fans are generally made of steel.
When the impeller rotates, the gas enters the impeller axially from the air inlet and is pushed by the blades on the impeller to raise the energy of the gas and then into the guide vanes. The guide vanes change the deflected airflow into axial flow and introduce the gas into the diffuser tube, further converting the kinetic energy of the gas into pressure energy, and finally introducing the working line.
Axial fan blades work in much the same way as aircraft wings. However, the latter is to lift the lift on the wing and support the weight of the aircraft, while the axial fan is fixed position and the air to move.
The cross section of an axial fan is generally a wing profile. The blade may be fixed in position or may rotate about its longitudinal axis. The angle of the blade and the airflow or the spacing of the blades can be adjustable or adjustable. Changing the blade angle or spacing is one of the main advantages of an axial fan. The small blade spacing angle produces a lower flow rate, while increasing the pitch produces a higher flow rate.
The advanced axial fan can change the blade pitch (which is quite similar to the helicopter rotor) while the fan is running, thereby changing the flow accordingly. This is called an adjustable blade (VP) axial fan.
Axial fans, also known as local fans, is commonly used in industrial and mining enterprises a fan, but different from the general fan of its motor and fan are in a cylinder, the shape is a cylindrical, for local ventilation, easy installation, Ventilation effect is obvious, safe, you can take the wind blower to the designated area.
When the axial fan is started, the motor current 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 leave a certain margin in the design of the motor , The speed of the motor is fixed, but in the actual use of the process, sometimes to lower or higher speed operation, so the frequency conversion is very necessary. The inverter can realize the soft start of the motor, and change the input voltage frequency of the device to achieve the purpose of energy saving and speed regulation, and can provide over-current, overvoltage and overload protection to the equipment.