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Fan abnormal situation and treatment

Hits:Updated:2020-01-13 09:01:09【Print】

Air volume is too small
 
Causes and solutions
 
1 Reason: The system resistance is too large, and the fan selection is improper
 
Solution: Re-evaluate the system design and re-select
 
2 Reason: Leakage of air duct or clogging of debris
 
Solution: Plugging or cleaning up
 
3 reasons: impeller steering error
 
Solution: Correct the steering: Two-phase power line position of any exchange motor
 
4 Reason: The opening angle of the adjusting door is too small
 
Solution: adjust
 
5 Reasons: Increased density of the conveyed gas (too much solid impurities in the gas or too low gas temperature, etc.)
 
Solution: Eliminate the cause of increased gas density
 
6 Reason: Speed ​​reduction caused by slip of V-belt
 
Solution: Adjust the belt tension
 
7 reasons: the gap between the impeller and the air inlet is too large or the blade is seriously worn
 
Solution: repair, replacement
 
Excessive wind
 
Causes and solutions
 
1 Reason: The system resistance is too small, and the fan selection is improper
 
Solution: increase system resistance (such as properly blocking the air inlet, etc.) or reduce fan speed
 
Motor overload and abnormal temperature rise
 
Causes and solutions
 
1 reason: the system resistance is small, the air volume is too large (centrifugal fan)
 
Solution: increase system resistance or reduce fan speed
 
2 reasons: system resistance is large, the air volume is too small (axial flow fan)
 
Solution: reduce system resistance
 
3 Reason: Increased density of the conveyed gas (too many solid impurities in the gas or the temperature of the gas is lower than the rated operating temperature, etc.)
 
Solution: Eliminate the cause of increased gas density
 
4 Reason: The opening angle of the adjusting door is too small
 
Solution: adjust
 
5 reasons: V-belt is too tight
 
Solution: Adjust the belt tension
 
6 Reason: Motor power is too small
 
Solution: Replace the motor
 
7 Reason: Motor wiring error
 
Solution: check the circuit
 
8 reasons: poor insulation, motor failure
 
Solution: Repair or replace
 
Unusual sound
 
Causes and solutions
 
1 Reason: The bearing has cracks, scars or impurities mixed into the bearing
 
Solution: Replace the bearing
 
2 Reason: Insufficient lubricating oil (bearing noise and accompanying temperature increase)
 
Solution: Come on
 
3 Reason: Loose bearing lock nut
 
Solution: Retighten
 
4 reasons: spindle wear
 
Solution: Change shaft
 
5 reasons: shaft movement
 
Solution: Find the cause and correct it
 
6 Reasons: Impellers collide with air inlet or casing
 
Solution: repair, adjustment
 
7 Reason: The bolt connecting the impeller to the hub or shaft is loose
 
Solution: Tighten the bolts
 
8 reasons: the fan sucks foreign matter
 
Solution: Clear
 
9 Reason: The opening angle of the adjusting door is too small
 
Solution: adjust
 
10 reasons: poor piping system, excessive wind speed
 
Solution: Retrofit the piping system
 
Abnormal bearing
 
Causes and solutions
 
1 Reason: Too much lubricant and excessive filling of grease (often accompanied by oil leakage)
 
Solution: remove excess
 
2 Reasons: Insufficient lubricating grease or poor oil quality
 
Solution: Add grease or replace with new grease
 
3 Reason: Incorrect selection of grease, model does not meet requirements
 
Solution: clean the bearing and replace with qualified grease
 
4 Reason: The opening angle of the adjusting door is too small
 
Solution: adjust
 
5 reasons: the bearing installation is too tight
 
Solution: Check and reinstall bearings
 
6 reasons: bearing failure or fatigue wear
 
Solution: Check and replace the bearing
 
vibration
 
Causes and solutions
 
1 Reason: Imbalance of the impeller (rust, dust, dirt and other foreign matter adhere to the impeller)
 
Solution: sweep the impeller
 
2 reasons: the impeller is deformed or worn seriously
 
Solution: Replace the impeller
 
3 Reasons: Poor foundation design, or resonance caused by insufficient foundation strength or rigidity
 
Solution: check the foundation condition, repair and reinforce the anchor bolts properly
 
4 Reason: Mechanical vibration caused by poor or damaged bearing installation
 
Solution: Reinstall bearings or replace
 
5 reasons: motor vibration caused by motor failure
 
Solution: Repair or replace the motor
 
6 reasons: main shaft bending deformation or wear
 
Solution: Change shaft
 
7 Reason: Incorrect installation of coupling or pulley
 
Solution: make adjustments and recalibrate
 
8 Reason: External vibration (such as pipe vibration, etc.) is transmitted to the fan
 
Solution: The connection between the fan and the pipeline adopts a flexible soft pipe, and a damper is installed
 
9 Reason: Improper selection, causing the fan to work in unstable conditions (fan surge with intermittent noise)
 
Solution: adjust fan speed or reselect

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