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Main fault analysis of negative pressure fan
2022/06/07
The application of negative pressure fans in summer can be said to be the peak of the year. Frequent use will inevitably lead to failure. Once it is serious, it will damage the bearings and blades, and even damage the air duct. The following are some common negative pressure fans. The main obstacles are analyzed as follows:
1. The bearing box vibrates violently
1. The fan shaft is not concentric with the motor shaft, and the coupling is skewed.
2. The casing or the air inlet rubs against the impeller.
3. The stiffness of the foundation is not enough or firm.
4. The impeller rivets are loose or the disc is deformed.
5. The impeller shaft disc and shaft are loose, and the coupling bolts move.
6. The connecting bolts between the casing and the bracket, the bearing box and the bracket, the bearing box cover and the exhaust fan seat are loose.
Second, the bearing temperature rise is too high
1. The bearing box vibrates violently.
2. The grease is of poor quality, deteriorated or filled too much, and contains impurities such as dust, sticky sand, and dirt.
3. The tightening force of the bearing box cover and the connecting bolts of the seat is too large or too small.
4. The shaft and rolling bearing are installed skewed, and the front and rear bearings are not concentric.
5. The rolling bearing is damaged.
3. The motor current is too large and the temperature rise is too high
1. The gate or throttle valve in the intake duct is not closed tightly when driving.
2. The flow rate exceeds the specified value or the air duct leaks.
3. The gas transported by the fan contains viscous substances or the temperature is too low, and the gas density is too high.
4. The input voltage of the motor is too low or the single-phase power failure of the power supply roof fan.
5. The coupling is not properly connected, the apron is too tight or the gap is uneven.
Fourth, the belt slips off
The corresponding grooves of the two pulleys are not aligned.
5. Belt beating
The distance between the two pulleys is short or the belt is too long.
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