Troubleshooting Measures for Abnormal Conditions in Shell-less Centrifugal Fans

Troubleshooting Measures for Abnormal Conditions in Shell-less Centrifugal Fans

When the main power indicator of a shell-less centrifugal fan fails to illuminate, verify whether the indicator fuse and the fuse in the indoor distribution panel have blown within the specified timeframe, and ensure the power cord is securely connected. If the fuse has blown, replace it and restore power to the medium-low voltage circuit of the shell-less centrifugal fan. When the main power indicator is lit normally, inspect the carbon brush wear. If wear exceeds one-third of the total length, replace the carbon brush promptly. Simultaneously, verify the vacuum pump pressure gauge and oil pressure readings. Excessive oil pressure prevents engine startup; check for oil line blockages, particularly at orifices. If blockages persist, perform cleaning and unblocking procedures. If an oxide layer forms on the rectifier surface, or if it burns unevenly with inconsistent brush and rectifier outer edges, be aware this may cause pressure loss and dropout in medium-low speed non-volute centrifugal fans. Clean the rectifier and electric brushes to ensure proper contact. When rotating coil short circuits or breaks occur, verify with a multimeter. During operation of low-to-medium pressure non-volute centrifugal fans, centrifugal separation tubes may rupture due to metal fatigue, overspeed, excessive stress, chemical corrosion, improper selection, unbalanced rotors, or uncontrolled temperatures, leading to sample leakage and rotor damage. Beyond these issues, during operation of low- and medium-pressure centrifugal fans, insufficient bearing lubrication or contamination may cause bearing damage or rolling resistance. This increases friction resistance, preventing the motor from reaching rated speed. Prompt cleaning or bearing replacement is required to restore normal operation of the shell-less centrifugal fan assembly.