Installation requirements
The foundation of the fan should be level, solid, and the height of the foundation should be no less than 200mm.
B. The fan and the air duct are connected by flexible hoses (made of flexible material and non-flammable), with a length of no less than 200mm and the pipe diameter being the same as the inlet and outlet dimensions of the fan. To ensure that the hose does not twist or deform during the operation of the system, it should be installed with an appropriate tightness. For the canvas hose installed at the suction end of the fan, it can be installed a little tighter to prevent it from being sucked in when the fan is running and reduce the cross-sectional size of the canvas hose.
C. The steel support of the fan must be fixed on the concrete foundation, and rubber vibration isolation pads must be added between the steel support of the fan and the foundation. All the fan and motor assemblies are installed on a solid steel frame. The steel ground frame is installed on the vibration isolation pad at the top of the foundation. It is best to use a multi-hole rubber sheet for the vibration isolation pad.
D. The pipe diameter at the fan outlet can only be increased and not decreased. Finally, an insect-proof net should be installed at the air outlet. When the air is discharged upwards, a wind and rain cap must be added.
Daily maintenance
Proper maintenance and care are important guarantees for the safe and reliable operation of fans and for extending their service life. Therefore, when using fans, full attention must be paid.
Impeller maintenance
During the initial operation of the impeller and all regular inspections, whenever there is an opportunity, it is necessary to check whether the impeller has defects such as cracks, wear, and dust accumulation.
Whenever possible, the impeller must be kept clean and the accumulated dust and rust scales on it should be regularly brushed off with a wire brush. Because as the operating time increases, these dusts cannot be evenly attached to the impeller, which will cause the impeller balance to be disrupted and even lead to rotor vibration.
Once the impeller has been repaired, it needs to be rebalanced. If conditions permit, a portable dynamic balancing instrument can be used to balance on site. Before performing dynamic balancing, it is necessary to check whether all the locking bolts are tightened. Because the impeller has been running in an unbalanced state for some time, these bolts may have loosened.
Bearing maintenance
Regularly check the oil supply of the bearing lubricating oil. If there is oil leakage in the box, you can tighten the bolts of the end cover a little. If this still doesn't work, it may be necessary to replace the sealing packing with new ones.
When the lubricating oil of the bearing is in normal use, it should be replaced at least once every half a year. For the first use, it should be done approximately after 200 hours of operation. The second oil change should be carried out every 1 to 2 months. Thereafter, the lubricating oil should be checked once a week. If the lubricating oil has not deteriorated, the oil change can be extended to once every 2 to 4 months. When replacing, the specified grade of lubricating oil must be used (as indicated in the general drawing), and the old oil in the oil tank must be completely drained and cleaned before new oil can be filled in.
If the bearings of the fan need to be replaced, the following points should be noted:
Before installing the new bearing, both the bearing and the bearing housing must be kept very clean. Heat the bearing in oil at a temperature of approximately 70 to 80 degrees Celsius before installing it onto the shaft. Do not force the assembly to avoid damaging the shaft.
Maintenance and repair of the remaining supporting equipment:
The maintenance and repair of each supporting equipment, including motors, electric actuators, instruments, meters, etc., are detailed in their respective user manuals. These user manuals are all provided by the respective supporting manufacturers. Our factory will randomly pack these manuals and provide them to users.
Casing repair
Apart from regularly checking whether there is severe wear on the casing and the interior of the intake chamber and removing severe dust accumulation, no other special maintenance is required for these parts. Regularly check whether all the fastening bolts are tightened. For fans with compression bolts, press the butterfly springs on the bottom feet to the installation height specified in the drawing.
Emergency shutdown
Emergency shutdown: During the trial operation of the unit, if any of the following situations occur, an immediate emergency shutdown must be carried out. The operation for emergency shutdown is to press the stop button of the main motor first, and then carry out the follow-up handling work after the shutdown.
The centrifugal fan suddenly experienced intense vibration and had already exceeded the trip value.
There are scraping or abnormal friction sounds inside the machine body.
Smoke appears at any bearing or seal, or the temperature of a certain bearing rises sharply to the alarm value;
When the oil pressure is lower than the alarm value and cannot be restored to normal;
The fuel tank level is low and there is already a phenomenon of suction.
When the axial displacement value shows a significant and continuous increase and reaches the alarm value;
Normal shutdown
Gradually open the vent valve while gradually closing the exhaust valve.
Gradually close the intake throttle to 20 to 25 degrees.
Press the stop button and pay attention to whether there are any abnormal phenomena during the shutdown process.
The oil supply can be stopped 5 to 10 minutes after the unit stops, or when the bearing temperature drops below 45 degrees Celsius. For units with floating ring seals, the sealed oil pump must continue to supply oil until the body temperature drops below 80 degrees Celsius.
After the unit is shut down, rotate the rotor 180 degrees regularly within 2 to 4 hours.