Various faults of varying severity may occur during the operation of any cabinet-type fire centrifugal fan. This article focuses on typical problems prone to arise at the transmission shaft sealing parts of cabinet-type fire centrifugal fans.

The wear resistance of a cabinet-type fire centrifugal fan is determined by its structural configuration and material composition. For instance, different types of steel subjected to different heat treatment processes can exhibit identical hardness yet distinct wear resistance characteristics. Operating conditions bring significant influence on dust accumulation and abrasion degree of cabinet-type fire centrifugal fans. Severe bearing wear will occur after long-term service of centrifugal fans.

The shaft seal assembly consists of two independent oil-impregnated sealing gaskets installed inside the drive end cover. A rising oil level inside the oil sump indicates excessive internal component leakage, requiring timely replacement of relevant parts. However, external leakage rarely occurs if the bearing seals and outer sleeves of the cabinet-type fire centrifugal fan remain intact without abrasion. Furthermore, the surface smoothness of the fan shaft exerts a critical impact on sealing performance. The clearance between matching parts is only a few thousandths of an inch, so operational abnormalities may stem from causes other than component wear. Will equipment modification or pipe base adjustment lead to adverse interference or shaft rubbing?