FAN FOR REGENERATIVE AIR VACUUM STREET SWEEPER, AND METHOD OF FAN MANUFACTURE AND ASSEMBLY
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United States of America
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Issued Date -
Mar 17, 2022
app pub date -
Sep 14, 2020
filing date -
Sep 14, 2020
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Abstract
A fan with airfoil blades is provided for a regenerative air vacuum street sweeper. The blades are formed using cut and pressed upper and lower panels which are welded at a forward edge to a rod to form the airfoil leading edge and welded at the rear edges to form the airfoil trailing edge. Pins extend laterally outwardly from the rod for mounting each blade in corresponding holes in the front and rear plates of the fan housing. The side edges of the blade are welded to the plates at a 9-11° angle of attack. The airfoil blades allow for reduced size, horse power, noise, and manufacturing and shipping costs.
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