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Backward Curved Impeller Design. There are some small slimline impellers that are placed in a scroll (much like the fans in this article), and the purpose of the scroll can be for one of two. The vanes of centrifugal pumps are curved backward to prevent overloading of the impeller motor.
XR Backward Curved Motorized AC Impeller Continental Fan from continentalfan.com
26 rows ec backward curved centrifugal fans design external rotor motors are usually contained within the depth of the fan impeller, thus saving the space normally occupied by a standard motor. They are located in the air stream, so temperature is limited, and are generally of protection class ip44, so the air needs to be clean and dry to avoid motor. Diameter of backward curved impeller is 133mm, 175mm, 190mm, 220mm, 225mm, 250mm, 280mm, 310mm, 355mm and 400mm.
XR Backward Curved Motorized AC Impeller Continental Fan
The main objective of this paper is to show comparison of backward curved impeller with backward inclined airofoil of centrifugal fan. Heko backward curved centrifugal fan series is with ec and dc input. Backward curved, backward inclined and airfoil impellers have similar performance curves and thus the following backward curved fan information applies to backward inclined and airfoil fans, as well. 26 rows ec backward curved centrifugal fans design external rotor motors are usually contained within the depth of the fan impeller, thus saving the space normally occupied by a standard motor.
