External rotor air conditioning fan maintenance and failure causes

 External rotor centrifugal air conditioning fan has the characteristics of large air volume, low noise, compact structure, durable, beautiful appearance, easy installation and use. The fan is widely used in various air conditioning units, air curtain, cooling and heating fans, etc. It can also be used for indoor ventilation in industrial and mining enterprises and public places. The medium it transmits is air and other non-flammable gases harmless to human body. No particulate matter is allowed in the gas and the dust content is not more than 150mg/m³.

External rotor air conditioning fanMaintenance work system

1. The external rotor air conditioning fan must be used and maintained by special personnel.

2. External rotor air conditioning fan is not allowed to run with disease.

3. Regularly remove dust inside the external rotor air conditioning fan, especially the dust, dirt and other impurities on the impeller, in order to prevent corrosion and imbalance.

4. External rotor air conditioning fan maintenance must emphasize the first power shutdown.

5. Regularly check the sensitivity of thermometer and oil mark.

6. Except that the lubricating oil should be replaced after each disassembly and repair, the lubricating oil should be replaced once from march to June under normal circumstances.

External rotor air conditioning fanThe main faults and causes of

1. Violent vibration of bearing box

(1) The outer rotor air conditioning fan shaft is different from the motor shaft, and the coupling is tilted

(2) & have spent The casing or air inlet rubs against the impeller

(3) & have spent The rigidity of the foundation is not strong

The impeller rivet is loose or the impeller is deformed

The leaf wheel shaft plate and shaft loose, or the coupling bolt loose

(4) The connecting bolts between the chassis and the bracket, the bearing box and the bracket, the bearing box cover and the seat are loose

The air inlet and outlet pipes of the external rotor air conditioning fan are poorly installed

The rotor is not balanced, the rotor air conditioning fan blade wear

2. Bearing temperature rise is too high

(1) Violent vibration of bearing box

(2) Lubrication grease quality is not bright, metamorphic, contains too much dust, sand, dirt and other impurities

( The tightening force of the connecting bolts of the bearing box cover and seat is too large or too small

(3) The shaft and rolling bearing are installed askew, and the front and rear bearings are different

The rolling bearing is damaged

3. Electrode current is too high or temperature rise is too high

(1) The intake pipe gate or throttle valve is not closed when starting

(2) The flow exceeds the specified value

(3) The density of air transported by the external rotor air conditioning fan is too large or has viscous substances

The motor input voltage is too low or the power supply is single-phase

The coupling connection is not correct, the leather ring is too tight or the gap is not uniform

(4) Affected by the violent vibration of the bearing box