Reasons for sudden fan failure

The wind turbine’s strength decreases and it gets torn apart! It can’t be a fiberglass fan, right? This situation often occurs with fiberglass reinforced plastic fans.

Both the fan impeller and casing are made of stainless steel

A fan is a device that converts the mechanical energy of a prime mover into mechanical energy for moving gases. Although there are many types of fan failures and their causes are complex, investigations into actual plant operations show that the most common fan failures include bearing vibration, high bearing temperatures, stuck moving blades, and malfunctioning protection devices.

The cast impeller had defects and broke! Or it might be that the presence of foreign objects caused the impeller to break!

I agree that it’s possible for foreign objects to get inside. A few days ago, the heater in front of the fan leaked, so the fan was stopped and the air inlet was covered with plastic sheeting. I forgot about that when turning the fan back on, and as a result, the fan vibrated violently – it seemed like it might fall over. If something hard gets inside, it’s very likely to damage the fan

It’s not clear what is meant by sudden damage, nor what the symptoms are; it’s difficult to make a judgment

Possible causes: 1. A foreign object has entered the operating fan and become stuck between the casing and the impeller, causing damage to both the casing and the impeller； 2. There are defects in the impeller manufacturing, which cause damage during high-speed operation. The fragments caused further damage to the casing ；

Welding of the impeller to the main shaft causes quality issues! When the load is too high, the force exerted on the impeller becomes excessive, the negative pressure in the middle increases, the welds crack, and the impeller is flung out, causing damage to the fan!

It can suddenly damage the casing during operation, tear the impeller, and also damage the motor; this is a serious fault. I’m not sure about the condition of the shaft Both the impeller and the casing are made of stainless steel, and they are fabricated through welding. Delamination of welds or tearing of seams can occur, which leads to imbalance and damages to the impeller and the casing.

Could it be that prolonged operation and material aging caused the fan impeller to rupture suddenly? It is related to temperature, medium, and usage time.

1. Foreign objects entering and causing damage to the impeller as well as the casing. 2. Sudden tearing or fragmentation of defects in the impeller, leading to damage to the casing. 3. Breakage of the shaft end, resulting in damage to both the impeller and the casing. The motor failure is likely due to burned-out bearings, possibly caused by overload on the motor bearings following damage to the fan. But ordinary motors usually have overload protection, so it is necessary to check whether the setting values are appropriate or if there is any drift. I think the original poster should describe the malfunction in more detail so that everyone can benefit from it!

I’ve encountered similar situations before; first there are slight vibrations and then suddenly the fan gets damaged. Also, check whether the gas being transported contains chlorine; stainless steel is resistant to chloride ions ； The leaves will have rows of corrosive grooves.

In addition to agreeing with the opinion from the eighth floor, there is another possibility: could it be that the fasteners are loose, resulting in an unbalanced impeller and thus causing an accident?

During operation, the fan suddenly damaged its casing, the impeller was torn apart, and the motor was also damaged; the cause is unknown. A similar situation occurred with the boiler exhaust fan in our factory. The reason for this was that the exhaust fan used a wing-type impeller whose blades were hollow. As these blades wore out during operation, fly ash entered their hollow spaces, resulting in an uneven mass distribution around the blades. Due to the rotation of the impeller, severe vibrations occurred, which led to the impeller being ejected from its housing, cracks forming in the foundation, and even damage to the motor. We call this phenomenon digging at the root. Later, we cladded the fan impellers with Fe-05 wear-resistant material, and took advantage of routine maintenance opportunities to conduct regular inspections, addressing any issues promptly; as a result, the aforementioned problems hardly occurred anymore.

It could be due to the following reasons: 1. During operation, foreign objects may get into the impeller, or components of the impeller structure may fall off (such as rivets or caps), resulting in damage to the impeller. 2. The medium conveyed by the fan is corrosive; after operating for a period of time, corrosion of certain components of the fan’s impeller causes the rotor to lose its balance (a similar situation occurred with the boiler fans in our facility when dust removal water was used). 3. Damage to the bearings was not detected in time, resulting in overheating of the shaft during operation, which led to bending and subsequent damage to the impeller and casing. 4. Motor damage is mainly caused by overload and circuit breakage of the motor following damage to the fan.

It was likely caused by a relatively hard foreign object entering the fan; first, the impeller was torn, which then led to damage to the casing, and this in turn caused the impeller to get stuck and resulted in damage to the motor.

The impeller must have collided with the casing, and it’s also aged

It is likely caused by the presence of foreign objects, or it may be due to damage to the impeller.

:Loveliness: A few days ago here, the disc of the butterfly valve at the inlet of a boiler fan fell into the fan during operation, getting stuck in the impeller and causing damage to the fan casing and bearing box