In the process of daily use, the centrifugal fan will have different degrees of failure due to different reasons. Some minor faults can be solved by only a little adjustment. If serious faults are encountered, new parts need to be replaced, or contact the manufacturer Repair after sale.

Failure Cause Analysis Workaround
Impeller Ash The backward inclined blade is more likely to stick to dust, which will cause the impeller to balance in the urban area and cause vibration The dust deposits on the blades can be cleaned regularly during planned maintenance or downtime, so as to ensure the operation accuracy of the fan
Change the air inlet from the horizontal air inlet to the downward air inlet, although the wind resistance will increase, but the air intake quality is greatly improved
Lubrication system failure The clearance between the end face of the gear and bearing and the end face of the side cover is too small The clearance can be adjusted to the required range by overhauling
The clearance between the oil pump bearing hole and the gear shaft is too small
Radial clearance between housing bore and gear is too small
The quality of the lubricating oil is not good, the viscosity is not suitable or there is too much water Replacement of high-quality lubricants
tripped Excessive starting current It is recommended to start with reduced pressure for fans with large power capacity
Fan load is too high The air inlet or outlet control valve of the duct can be adjusted down
The switching capacity is too small or the setting value of the thermal protector is too small Reasonable design
The impeller rotates in the opposite direction Adjust the impeller to the correct rotation direction in time
Phase loss caused by poor incoming line contact or the same phase, etc. Check the line and repair it in time
The poor performance of the accessories of the control box or the poor contact of the line to the fan causes the phase loss
Abnormal vibration of centrifugal fan Unbalanced rotor rebalance
Dust buildup or dirt builds up in the impeller of the rotor Regular inspection and timely removal of dust and dirt
Impeller corrosion or deformation Repair in time or replace the new impeller according to cleaning
Worn bearings or loose bearing housing glands Regular inspection, find problems and repair or replace in time
Poor alignment of the coupling readjust and correct
The bearing box or the anchor bolts of the motor are loose Tighten the bolts in time
Bearing heat Improper installation of rolling bearing, the assembly of outer ring and bearing seat is too tight Disassemble and inspect the bearing housing, and then reassemble after confirming that there is no problem
Severe bearing wear or failure due to increased clearance At this time, it is necessary to replace the new bearing
The oil level of the axial box is lower than the standard position, resulting in a serious shortage of oil Check in time according to the usage, and add lubricating oil to the standard oil level
Air pressure decreases, flow decreases Severe impeller wear Disassemble and repair in time, re-balance, if it affects the use, you can replace the new impeller
The drive belt is slack and cannot reach the rated number of revolutions Adjust as required and replace drive belt
Inlet pipeline water accumulation or blockage Regular inspection and timely cleaning of import pipelines
increased noise Bearing wear or sudden failure If any problem is found, dismantle and inspect it in time, and replace the bearing with a new one
The impeller rubs against the mouth ring Immediately shut down for inspection and repair
Vibration caused by fixtures The cement foundation is too light, the grouting is poor or the plane size is too small, causing the fan foundation to be disconnected from the foundation, the anchor bolts are loose, and the connection of the machine base is not strong enough to make the foundation rigid enough Reinforce foundation or re-grouting, tighten nuts
Fan base or volute stiffness is too low Reinforces the rigidity of the fan base or volute
The inlet and outlet pipes connected with the fan are not supported and softly connected Add support and soft joint
The adjacent facility is too close to the foundation of the fan, or its stiffness is too low increase stiffness

The above is the entire content of the common faults and solutions of centrifugal fans. After the above introduction, we can see that no matter what the situation is, we must first analyze it and analyze what causes it. For some minor faults, we only need to adjust or clean up in time. That is, some faults need to be stopped immediately for maintenance. It should be noted that if the problem is serious, you must contact the manufacturer’s after-sales service for repair.