Fan

Details Fan Fan

1987-01-20

1988-06-14

Garrett, Robert E.

Rotary kinetic fluid motors or pumps

With sound or vibratory wave absorbing or preventing means...

181205, 181225, F04D 2966

Patent

active

047508604

ABSTRACT:
An improved fan, for mounting adjacent an opening in a mounting plate, includes blades rotatable about an axis and within a cylindrical housing. The fan blades move air through the opening in the mounting plate. A cylindrical, open-cell foam collar encircles the fan housing. The collar is sized so that the collar extends a substantial distance upstream past the edge of the collar. The foam collar reduces the acoustic noise from the fan by damping the housing vibration and also by acting as a barrier to muffle sound waves in the air. In addition, the foam collar straightens out the air flow prior to entering the fan blades making it more laminar and less turbulent to increase the efficiency of the fan.

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