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The fan is a machine that relies on the input mechanical energy to increase the gas pressure and discharge the gas. It is a driven fluid machine. The blockage of the fan will directly affect the operation of the entire mechanical process, so its maintenance is very important. Let's specifically introduce the maintenance of the fan.
1. Maintenance of the fan
The impeller is the rotating part of the fan, and its function is to transport the gas through the fan to the air outlet. For example, it consists of a rear disc, a straight front disc with an inlet ring, and blades. The blades are composed of arc blades with a larger radius of curvature. In the early stage of impeller operation and all regular inspections, whenever there is a chance, it is necessary to check whether the impeller is reliably fixed on the shaft shoulder, and whether the impeller has defects such as cracks, wear, and dust accumulation. Whenever possible, keep the impeller clean, and regularly use a wire brush to remove dust and rust on it. Because with the lengthening of the running time, these dusts cannot be evenly attached to the impeller, which causes the impeller balance to be damaged, which causes the rotor to fluctuate.
As long as the impeller is repaired, it needs to be rebalanced. Before performing dynamic balancing, it is necessary to check whether all the tightening bolts are tightened. Because the impeller has been operating in an unbalanced state for a period of time, these bolts may have been loosened.
Check the axial position of the impeller according to the fan installation distribution diagram and the size of the collector inserted into the impeller inlet ring. Check the radial clearance between the collector and the inlet ring of the impeller. If necessary, adjust the collector or casing to get the correct clearance space. This ensures that the side plate of the air inlet box of the casing is calibrated in the correct position relative to the main shaft and the main shaft seal. Check and make sure that the positions of the inlet and outlet ends of the casing and air intake box meet the requirements of the drawings and connecting pipes.
Second, the maintenance of the casing and air intake chamber
Except for regular inspections of the casing and intake chamber for severe wear and removal of severe dust accumulation, no other maintenance is required for these parts.
Regularly check whether all the fastening bolts are tight, and press the butterfly spring on the foot to the installation height specified in the drawing.
3. Maintenance of main shaft and coupling
The main shaft should be kept clean, and the shaft shoulder should be scraped off every year. Special attention should be paid to the position where the main shaft passes through the shaft end seal of the side plate of the intake chamber. Due to the condensation of a small amount of leaked air, these positions are likely to cause corrosion. .
If the fan has been operating in an unbalanced state for a period of time, check the straightness of the spindle as much as possible. The coupling should be kept clean and its connection and tightening should be checked regularly.
Fourth, the maintenance of the bearing department
Frequently check the lubrication and oil supply of the bearing. If there is oil leakage in the box, you can tighten the bolts of the end cover a little bit. If this does not work, replace with a new seal.
When the lubricating oil of the bearing is in normal use, it should be replaced at least once within six months. When it is used for the first time, the oil should be inspected at least six months.
In addition to maintenance, daily inspections are more important for fans. The following are the daily inspections of fans provided by Jiangsu Zhongnan blower professional technicians:
1. Before turning on the fan, clean the foreign matter inside the fan, check whether the main shaft is loose, and whether the opening device is abnormal;
2. Check the tightness of the fan belt weekly, adjust the position of the large and small pulleys, and keep the two on the same level;
3. When the fan is running, check whether there is any abnormal sound from the fan, check that the opening angle of the shutter is less than 90 degrees, and clean the dust of the shutter every day to prevent the shutters from being tightly covered and causing serious air leakage and affecting work efficiency.
4. Check the working sequence and working status of the fan according to the working status of the temperature controller.