Upright vacuum with reduced noise

Details Upright vacuum with reduced noise Upright vacuum with reduced noise

A - Human Necessities

47

L

A47L 9/00 (2006.01) A47L 5/22 (2006.01) F04D 29/66 (2006.01)

Patent

CA 2736339

According to various embodiments, a method of reducing noise generated by a vacuum is described. The method comprises providing a vacuum comprising a motor including a motor shaft adapted to operate at a rotational speed of n; attaching a centripetal fan with t number of blades attached to the motor shaft; enclosing the fan between the motor and a motor housing end bracket disposed about the shaft, the motor housing end bracket defining an air input opposite an air output; wherein the variables of speed n and the number of blades t are selected so that a blade pass frequency (BPF) of the centripetal fan is greater than about 5000 Hertz, and the BPF is calculated as BPF = n * t / 60. A vacuum implementing the method is also described.

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