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Diagnosis and treatment of abnormal noise of fan blades of diesel generator

When the diesel generator set is working, as the fan blade is used for a long time, sometimes it will suddenly make a noisy noise, especially as the speed of the diesel generator set rises, the noise will increase accordingly. This kind of phenomenon is called a fan Abnormal sound of leaves.

⑴ Reason
①Due to the vibration of the fan blades, the rivets between the blades and the fan impeller hub are loosened.
②The fan fastening screws are loose.
③A crack was formed at the root of the fan blade, which changed the inclination angle of the blade.
④The fan blade is broken.

⑵ Diagnosis and treatment methods
①During the operation of the generator set, if an abnormal noise is heard suddenly, the engine should be turned off immediately, and then the machine should be shut down for inspection to avoid damage to the radiator due to broken fan blades.
②Use the starter to drive the fan to rotate at a low speed, and check for uneven operation or swing back and forth. If this phenomenon occurs, the diagnosis can be further confirmed.
③Stop the rotation of the diesel generator set and turn the fan blades back and forth with the hand to feel loose, indicating that the fastening bolts of the fan pulley are loose, or the screws of the fastening fan are loose, and they should be welded or replaced in time.
④When a crack is found at the root of the fan blade, it should be welded or replaced in time.
⑤If the fan blade breaks on the way but cannot be repaired, the fan can be removed, the symmetrical blades can be cut off, and the operation will continue after installation. It is worth noting that when the blades are used after being cut, the speed of the diesel generator set should not be too high due to the reduction of the fan’s exhaust air volume to prevent the diesel generator set from overheating.


Post time: Mar-09-2021

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