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Axial Flow Impeller Whether To Meet The Design Requirements
Jun 23, 2017

Axial Flow Impeller, the use of a very wide range, that is, with the fan axis of the same direction of the air, such as 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 Flow Impellers are usually used in situations where the flow rate is high and the pressure is low. The Axial Flow Impeller is fixed and moves the air. Axial Flow Impeller is mainly composed of fan impeller and housing, simple structure but the data requirements are very high,

Ordinary Axial Flow Impellers 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, etc., there are mining shaft Flow fan,

Anti-corrosion, explosion-proof Axial Flow Impeller 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 type temperature does not exceed 60 ℃. The amount of dust transported to the gas shall not exceed 150mg / m3,

Axial Flow Impeller is mainly composed of impeller, housing, motor and other components, the use of steel and the stent duct connection. One of the anti-corrosion type Axial Flow Impeller impeller, the chassis are made of glass fiber reinforced plastic, other types of Axial Flow Impellers are generally made of steel.                   

working principle

When the impeller rotates, the gas enters the impeller from the air inlet in the axial direction, and the energy of the gas is raised by the pushing of the blade on the impeller and then flows into the guide vane. 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 Flow Impeller 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 Flow Impeller is fixed position and the air to move.

The cross-section of an Axial Flow Impeller is generally a wing profile. The blade may be fixed in position or rotatable about its longitudinal axis. The angle of the blade and the air flow or the spacing of the blades can be adjustable or adjustable. Changing the blade angle or spacing is one of the main advantages of Axial Flow Impellers. The small blade spacing angle produces a lower flow rate, while increasing the pitch can produce a higher flow rate.

The advanced Axial Flow Impeller 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 Flow Impeller.

According to the characteristics of Axial Flow Impellers to make the following categories:

According to the material classification: steel fan, glass steel fan, plastic fan, PP fan, PVC fan, magnesium alloy fan, aluminum fan, stainless steel fan and so on.

According to the use of classification: explosion-proof fan, anti-corrosion fan, explosion-proof anti-corrosion, dedicated Axial Flow Impeller fan and other types.

According to the use of requirements classification: pipe, wall, post, fixed, rain and dustproof, mobile, motor and other external.

According to the installation can be divided into: belt drive, motor direct type.               

Installation method

Ready to work

Out of the box to check whether the fan parts are complete, whether the bumps outside the chassis, with particular attention to whether the head rectifier bumps deformation, the parts are closely connected, whether the damage of the blade motor, impeller rotation is flexible, To be repaired and adjusted. Check the installation of the fan foundation, it must have sufficient strength and stiffness to ensure that the load can withstand the operation of the fan, and check the foundation and fan connection size is consistent with the design requirements.                       

Installation matters

1, the fan lying to install the shock absorber through the coupling bolts fixed to the fan base, with the center of the high adjustment pad to adjust the level of the shock absorber, with a fixed bolt to the machine has been welded on the basis of the connection plate , Such as the fan due to seismic and other reasons without shock absorber, then the fan seat on the screw hole and the embedded bolts can be directly connected.

2, side wall installation of the basic requirements of the installation of the same fan and lying installation, but the installation bracket made of inclined arm support, the bracket should have sufficient strength and stiffness, 10 # or more fans should not use this installation The

3, hanging installation first shock absorber and fan bolts connected into one, shock absorber symmetrical installation, arranged on both sides of the fan center of gravity, the fan will be inserted directly into the suspension bracket, hanging bracket height, depending on the actual space distance Customized by the user, more than 16 # fan generally do not use this type of installation.

4, vertical installation fan vertical installation method and lying-style installation of the same, the strength of the fan base and stiffness requirements more stringent.

5, the fan and the two ends of the pipeline connection must be flexible joints to isolate the vibration and protection of the fan.

Debugging method

1, after the installation of Axial Flow Impeller, before starting to check the flexibility of the fan rotation, hand toggle the blade whether the phenomenon of friction plate. Check whether there are leftover things and other debris in the fan and adjacent pipes.

2. Check that the damper in the pipe is open.

3, personnel should be away from the fan.

4, start the fan, check the fan rotation is consistent with the rotation mark mark, after passing the test, the test run after 10-30 minutes to stop, check whether the loosening of the leaves, vibration and the ground connecting bolts with or without loosening, Everything is normal, it was officially launched, put into operation.