What are the possible reasons for the drop in the output of the centrifugal fan?

The principle of centrifugal fan

Centrifugal fan is a machine that relies on input mechanical energy to increase gas pressure and discharge gas. It is a driven fluid machine. The centrifugal fan is driven by the motor to rotate the impeller. The blades in the impeller force the gas to rotate, do work on the gas and increase its energy. The gas is thrown around the impeller under the action of centrifugal force, and the speed energy is converted into pressure energy through the vortex casing. When the gas in the impeller is discharged, the pressure in the impeller is lower than the pressure in the air inlet pipe, and the new gas is sucked into the impeller under the action of the pressure difference, and the gas is continuously discharged from the pump.

Possible reasons for the drop in the output of the centrifugal fan

1. Motor failure, such as a partial short circuit of the stator winding of the motor, causes the speed to drop.

2. The impeller may have dirt attached to it to increase the load and affect its speed.

3. The impeller is unbalanced (and there will be abnormal vibration at the same time).

4. Whether the air inlet has any obstruction to the air, such as the air inlet valve is closed or the air inlet filter is dirty or blocked.

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