The air inlet is made into a convergent streamlined overall structure and fixed to the front cover plate with bolts.
The transmission system consists of a main shaft, a cold oil bearing box, a coupling, and other components. The main shaft is made of high-quality steel, and the bearing box has an overall structure using rolling bearings. It must be noted that lubricating oil must be added to the bearing box before the fan is put into use.
The outlet plug valve cuts off the back pressure during maintenance to prevent the backflow of sealing air. During normal operation of the fan, the plug-in valve is in a long open state. To ensure the normal operation of the plug-in valve, good lubrication is necessary.
The start-up of the fan must be carried out under no-load conditions, therefore the inlet flow control device must be turned off before each start-up of the fan. After reaching the working speed, gradually open the regulating device to the required working conditions.
After the fan is started normally and reaches the rated speed and operating conditions, there should be no severe vibration, impact, or sudden increase in bearing temperature. Under normal circumstances, the bearing temperature rise should not exceed 40 ℃, and the surface temperature should not exceed 80 ℃. For safety reasons, it is generally stipulated that the bearing temperature should be less than 75 ℃. If there is any abnormal phenomenon, the machine should be stopped immediately to identify the cause and eliminate it.
During the trial operation of the fan, certain faults may occur. The main faults of the fan include high bearing temperature rise, severe vibration of the bearing box, excessive motor current, and rapid temperature rise.
