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The difference between forward blade and backward blade

Author:SIMO BLOWER Time:2017-05-19

The impeller type of centrifugal fan is mainly divided into forward blade and backward blade. These two types are very different. In this article, we will compare the difference between the two types of blades. So it can be your future reference when choosing industrial centrifugal fans.
impeller welding
1. Pressure: When the impeller size, speed and flow are the same, the full pressure of the forward type impeller is larger than that of the backward type impeller.
2. Efficiency: Although the pressure of forward blade is the maximum, it is mainly due to the  increase of the dynamic pressure of the impeller outlet. This dynamic pressure is more than 50% of total pressure. This partial dynamic pressure must be converted to static pressure in the spiral case behind the impeller. Practice proves that the efficiency of spiral case is low. In addition, the loss of the curved blade runner is larger, so the efficiency of the spiral case and the impeller is higher than that of the former.
 
centrifugal fan impeller
 

Blade angle

Project

Efficiency

Cost

Size

Scope of work

Speed

Abrasion resistance

Corrosion resistance

Noise

Operating Temperature

Forward

low

low

small

narrow

low

poor

average

high

Medium high

Backward

high

high

big

wide

high

good

good

low

medium

ID fan impeller
SIMO Blower impellers are in accordance with customer requirements and mostly apply the backward blade type. This blade can meet the needs of customers in many variety ways. At the same time, the use of the blade is longer. SIMO Blower focus on fan design and production. 60 years of service experience. Choose SIMO Blower industrial fan, because it is trustworthy!
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