What Is Ventilation Volume?

Ventilation is a technology that uses natural or mechanical methods to make the wind unobstructed and can pass through and reach rooms or sealed environments to create a suitable air environment such as hygiene and safety. Regular ventilation can improve indoor air quality and is good for your health.

How centrifugal fans work

Centrifugal fan is mainly composed of casing, motor, wind wheel, bearing, current collector, exhaust port, coupling, pulley and base. When the impeller mounted on the main motor shaft rotates at high speed, the air flow driven by the impeller will be thrown to the edge of the impeller at a higher speed under the action of centrifugal force, and gradually collected in the spiral casing of the fan. The speed of the air flow suddenly decreases, causing its air pressure to rise, and finally it is discharged out of the fan through the diffuser of the fan; at the same time, at the air inlet of the fan impeller, a negative pressure is formed due to the discharge of the air flow. Due to atmospheric pressure, it is continuously replenished into the inlet of the ventilator, and is thrown to the ventilation casing by the impeller, thereby continuously blowing air to the outside.

The centrifugal fan uses the principle of atmospheric pressure, making it suitable for areas with small air flow, high wind pressure and low speed, but due to its large volume, it also needs to reserve a large installation area. Based on the working principle and installation requirements of centrifugal fans, centrifugal fans are suitable for use in small mines and extra large mines. ^[2]

Main failures of centrifugal fans and their troubleshooting

1) Vibration failure of centrifugal fan

The large vibration of the fan during operation is a common failure. The main reasons are imbalance of the fan impeller, improper bearing center adjustment, inaccurate coupling alignment, insufficient strength of the concrete foundation of the fan, and unfixed ventilation ducts. . In short, most of the causes of fan vibration are caused by the imbalance of the fuselage. The main method to solve the fan vibration is to re-adjust the balance of the fan. In addition, if the concrete foundation of the fan is not strong enough, the fan unit needs to be removed, the concrete foundation prefabricated, and then reinstalled.

2) Heating failure of centrifugal fan

The centrifugal fan generates heat during operation. The main reasons are the lack of lubricating oil in the bearing, the quality of the lubricating oil does not meet the standards for use, there are debris and other debris in the bearing, the bearing is damaged, the rotating shaft of the fan is concentric with the rotating shaft of the motor Insufficient temperature, etc., the elimination of heating faults requires inspection and testing of the above major heating causes, replacement of lubricating oil, cleaning of the interior of bearings, etc. If the concentricity between the rotating shaft of the fan and the rotating shaft of the motor is not sufficient, Generally, with the abnormal vibration of the engine, the positions of the engine and the motor need to be corrected.

3) Centrifugal fan belt jump failure

The main reasons for the beating of the rotating belt during the operation of the centrifugal fan are that the two belts are not on the center line, the distance between the pulleys is too short, or the belt is too long. For the cause of the belt runout, the belt can be shortened or the fan pulley distance can be adjusted under the conditions. ^[2]