Centrifugal fan is the most common ventilation equipment in people's life and work. And under different working conditions, the demand of centrifugal fan’s air volume is also different.
Due to the influence of various factors, there is no need for a large amount of air, so some measures should be taken to reduce the air volume of the centrifugal fan, so as to conform to the actual needs. there are four ways to achieve this goal.
First of all, you can use the inverter or change the belt pulley ratio to reduce the speed, so as to change the centrifugal fan air volume. You need to add a converter in the internal centrifugal fan, which can realize frequency control, automatic control and reasonable speed, so as to realize the adjustment of the air flow.
Secondly, impeller diameter can be changed in centrifugal fan. Relatively small diameter of the impeller generated air volume will be relatively small. Meanwhile, the impeller outlet width is depressed to reduce the flow area of centrifugal fan. This can also reduce the air flow.
It was also proposed to reduce the air flow by reducing the number of blade of centrifugal fan. But in fact, this doesn't necessarily reduce air flow. Because the leaf number was reduced even though centrifugal fan power will decrease, but saved space increase the flow area, so whether it will reduce air volume depends on the specific circumstances.