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Forward Curved Vs. Backward Curved Centrifugal Fans
All centrifugal fans are not created equal. There are myriad types of blades that can be used in centrifugal fans, and it’ll be up to you to pick the one that fits your needs best. Two of the most common types of blades are forward curved (also known as backward inclined) and backward curved. It’s important for you to learn about both of these types of blades before purchasing a centrifugal fan. Find out more about them below.
These centrifugal fans are ideal for those companies looking for fans that can deliver medium to high airflow in their facilities. They utilize a much higher RPM than the RPM found in backward curved centrifugal fans, but it’s worth noting that they also usually have a lower efficiency. They often vibrate more than backward curved centrifugal fans as well and aren’t as strong structurally. Forward curved centrifugal fans are more cost-effective than backward curved centrifugal fans, though, and have become popular in industries like the medicinal industries since they don’t accumulate chemicals and other debris on their blades.
One of the first things you’ll notice when you compare backward curved centrifugal fans to forward curved ones is that they’re a lot heavier than their counterparts. They’re also a lot more energy efficient, which is one of the main things that makes them attractive to companies looking for centrifugal fans. They’re effective in environments that might cause corrosion in other types of centrifugal fans and are stronger overall than forward curved centrifugal fans.
The forward and backward curved centrifugal fan mainly refers to the different blades of their assembled.
The forward curved type is generally are blowers, and the backward curved type are induced draft fans.
The difference is the length of impeller rail and the edge. The forward curved is parallel to the edge
of the impeller,and the exit angle is greater than 90 degrees. The forward curved impeller, also known
as the forward impeller, and the forward impeller is mostly high pressure.
The back curved and the impeller are not parallel, and the length to the edge of the impeller is a few
centimeters or a few millimeters. The impeller exit angle is less than 90 degrees. So the rearward
impeller is also called the backward curved impeller, and the backward impeller is mainly medium pressure.
The difference is mainly manifested in three aspects:
1. Power: The static head used to overcome the resistance of the system.
The forward curved centrifugal fan is smaller than the backward curved centrifugal fan.
Since the channel in the backward-inclined blade fan is gradually enlarged,
the hydraulic loss is less than the forward-tilt type. Therefore, the efficiency of the forward curved
centrifugal fan is lower than that of the backward curved centrifugal fan.
2. Power consumption: Since the efficiency of the forward curved centrifugal fan is lower
than that of the backward curved centrifugal fan, its power consumption is greater than
that of the backward curved centrifugal fan.
3. Noise: The running noise of the forward curved centrifugal fan is greater than that
of the backward curved centrifugal fan.
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