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Excerpt from 'Fans & Blowers - Fine Tuning the Flow' article appearing in the June 2007 issue of Appliance Design magazine. 

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     Ganging together multiple fans can also increase efficiency. For instance, Soler & Palau’s OEM Products Division of Montville, N.J., offers backward-curved, motorized impellers that can be grouped for greater efficiency. A backward-curved impeller is a centrifugal air-moving wheel with blades inclined in the direction opposite to the direction of rotation. The motorized impeller features an external rotor motor. The fan blade assembly is press fit onto the external rotor, which spins on the outside of the stator, and the rotor revolves around it. The fins are curved against the direction of flow, which pushes the air, says Carl A. Giordano, P.E., senior vice president and general manager, Soler & Palau North America, OEM Products Division, Montville, N.J.

     Because the impellers only produce, at maximum, about 2 in. of static pressure, they can grouped together to increase airflow. In a typical configuration, the fans are installed in a tray and situated along the same plane, and they pull the air in the same direction and exhaust it in the same direction. “So, if you want to filter air,” says Giordano, “the fans would be placed behind the filter or behind the heat exchanger, and the impellers will pull air through that medium and then into the throat and exhaust it in the back of the unit.”

     The impeller does not require a housing to work, which gives the designer an “elegant solution” to a number of different applications. The impellers have permanently sealed ball bearings and can operate in any orientation. “They can be mounted upside down, sideways on a vertical plane, or horizontal plane,” says Giordano.

     The permanent-split-capacitor motors come in about a dozen sizes ranging from 5 in. to about 14 in., 115 V and 230 V, and are single phase, speed controllable. “That has the benefit of allowing the designers to change the RPM, which directly changes the air flow and static pressure to meet the application,” he says.
 

 

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Soler & Palau North America
OEM Products Division

150 River Road, Suite I-4A, Montville, N.J.  07045

Phone:  (973) 257-8900   •   Fax:  (973) 257-8999

email: oemsales@soler-palauinc.com

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