Routine Maintenance and Troubleshooting of Cooling Tower Fan

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    1. Flow is not enough or too large
    The shorter the pipe of the same fan, the greater the air flow, when the pipe length to a certain extent, the air volume is also close to zero, the fan static pressure to overcome the resistance of the pipeline to overcome the greater resistance, Will be more, therefore, the calculation of pipeline resistance is directly or not directly affect the size of the flow.
   Followed by leakage losses, such as the gap between the impeller and the duct is too large, the flange is not strict and so on.
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2. Machine vibration
    1) Rotor unbalance caused by vibration
    After the normal operation of the fan imbalance, the main reasons are as follows:
A. Blade corrosion or uneven wear;
B. Fan long-term stop, due to rotor weight and other factors to shaft deformation;
C. Leaves the surface of the uneven attachment, such as dog rust, dirt, etc .;
D. Transportation, installation and other causes of impeller deformation;
E. Impeller balance on the impeller after the fall off or not calibrated after the balance.
2) Other reasons
A. Fan selection performance with the pipeline does not meet the occurrence of surge;
B. The concentricity deviation between the impeller and the motor shaft is too large;
C. The two pulleys are not parallel;
D. Ventilator effort is not in the base;
E. Fixed parts are loose;
F. Wear or loose bearing.
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Second, running
When the entire equipment in accordance with the above requirements after the completion of the assembly, we can enter the trial operation phase, and first in accordance with the equipment required to provide the correct power supply, the required voltage fluctuations shall not exceed the required voltage of ± 8% frequency stable power supply. When we are properly connected to the power after the first move, and see if there is abnormal sound, whether vibration and so on. After careful inspection of the rear before the official power operation.
In use, we should try to avoid impeller overload, the pressure of each fan blade at a given speed to achieve the most appropriate efficiency point, when the impeller overload operation, the aerodynamic efficiency will be reduced, and the safety of the pose a threat to the leaves, To reach the maximum, the power consumption is increasing, its performance is in the attenuation.
In normal use, we set a safety factor for the fan, but the safety factor is not as big as possible, when the electric power exceeds the value we need to become a loss, and will cause our impeller in use overload, Reasonable choice of motor power is very necessary.
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Third, routine maintenance
    Daily inspection will help us to find the problem early to extend the life of the fan, in the daily inspection when we found abnormal or vibration should be immediately stopped to check to prevent major mechanical failure.
   For daily inspection can not stop, by listening and visual and touch to judge: whether there is abnormal, whether the vibration and so on.
   The following terms and conditions need to be checked for downtime:
1. The gap between the impeller and the hairdryer through the visual should be uniform, when there is obvious uneven should be amended;
2. By visually checking whether the blade is tilted or not, the angle of the blade is consistent, and when there is an inconsistency, the cause should be identified and the leaf is revamped;
3. Carefully check whether the leaves are deformed or bent, usually when the blade by external shock or friction between the fan will lead to such a situation and have serious consequences, it must be detailed inspection and replacement of damaged leaves;
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4. See whether the surface cracks, and corrosion;
5. Hand pull the impeller, listen to the rotation of any abnormal sound, rotation is flexible;
6. Check and clean the dirt on the blade surface;
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