Causes and Solutions for Abnormal Noises in Fire Smoke Exhaust Cabinet-Type Centrifugal Fans

Causes and Solutions for Abnormal Noises in Fire Smoke Exhaust Cabinet-Type Centrifugal Fans

During daily use, many users may encounter abnormal noises coming from fire smoke exhaust cabinet-type centrifugal fans. There are various reasons for these noises, and the solutions vary accordingly. If an abnormal noise occurs, please stop the machine and inspect it; do not continue using it until the issue is resolved. Today, Bioncao will share with you the causes and solutions for abnormal noise in fire smoke exhaust cabinet-type centrifugal fans. Cause 1: Cracks, damage, or foreign particles in the bearings. There are many reasons for cracks and damage in bearings, but the dynamic balance of the fire smoke exhaust cabinet-type centrifugal fan may be compromised. Due to the imbalance of the impeller, prolonged operation can cause the bearings to deform. Solution: Replace the bearings and verify the impeller’s balance. If conditions permit, perform a dynamic balance test on the fire smoke exhaust cabinet-type centrifugal fan. Cause 2: Insufficient lubrication in the fire smoke exhaust cabinet-type centrifugal fan. Insufficient lubrication primarily results from leaks in the bearing housing or poor sealing performance of the housing. Oil leakage from the bearing housing is a common occurrence; therefore, the bearing housing should be inspected regularly or at least once a day before startup. Solution: Add lubricating oil. Cause 3: Regular inspection is required. If a fire smoke exhaust cabinet-type centrifugal fan is operated for an extended period with loose nuts, vibration is inevitable. Check whether the nuts on components such as the bearing housing are loose. Solution: Retighten the nuts. Cause 4: The fire smoke exhaust cabinet-type centrifugal fan has collided with the inlet or outer casing The dynamic balance of the fire smoke exhaust cabinet-type centrifugal fan has been compromised. Due to the loss of balance, prolonged operation can cause bearing deformation, resulting in the impeller striking the inlet or housing. In this situation, stop the machine for maintenance. Solution: Repair, adjust, and verify whether the bearings are deformed. Reason 5: The fire smoke exhaust cabinet-type centrifugal fan has sucked in foreign objects. If foreign objects are sucked into the fan, stop the machine and remove them. If foreign objects remain inside the fire smoke exhaust cabinet-type centrifugal fan for an extended period, the fan will be damaged. Solution: Remove the foreign objects. Reason 6: Defective ductwork system, excessive air velocity. If there is an abnormal noise in the ductwork known as "surge," check whether there is a problem with the connection between the fire smoke exhaust cabinet-type centrifugal fan and the ductwork. If the issue persists, the ductwork must be modified. Solution: Modify the ductwork system. Summary: If the fire smoke exhaust cabinet-type centrifugal fan emits abnormal noises during operation, an investigation should be conducted as soon as possible. Prolonged abnormal noises can shorten the service life of the fan. Regular inspections of the fire smoke exhaust cabinet-type centrifugal fan are a simple and practical way to improve its efficiency and extend its service life.