Acoustic silencer nozzle
AssigneeMet Pro Corporation
InventorsLynn Thomas Secrest, Paul Antony Tetley
Life of this patent
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Abstract
An acoustic silencer nozzle for ventilation and exhaust fans. The nozzle provides at least two converging exhaust paths, each of which extend through an area that is adjacent acoustically absorbing media or resonating chambers. In this manner, the noise is reduced at the nozzle or outlet portion and provides a tight plume of high velocity discharge flow. Preferably, the nozzle has at least one opening that allows for ambient atmospheric air to mix with the exhaust gases at the outlet of the nozzle.
Claims23
An acoustic silencer nozzle comprising:
- a first outer wall section and a second outer wall section each approximately shaped as a partial conical section being concave toward each other and being oppositely positioned with respect to one another, at least a portion of each of the first and second outer wall sections comprising a perforated material, at least one first upper air outlet and at least one second upper air outlet for releasing exhaust gases therefrom;
- a first outer sheath disposed adjacent the portion of the first outer wall section comprising the perforated material to define a first outer enclosed space;
- a second outer sheath disposed adjacent the portion of the second outer wall section comprising the perforated material to define a second outer enclosed space;
- a first inner wall section positioned in spaced relation with respect to said first outer wall section, said first inner wall section being approximately shaped as one of a partial conical, cylindrical, and straight section being convex or straight toward said first outer wall section to define at least one first exhaust flow path therebetween adapted to receive exhaust gases and guide same to release upwardly through said first upper air outlet;
- a first inner sheath disposed adjacent the portion of the first inner wall section comprising the perforated material to define a first inner enclosed space;
- a second inner wall section positioned in spaced relation with respect to said second outer wall section, at least a portion of each of the first and second inner wall sections comprising a perforated material, said second inner wall section being approximately shaped as a one of a partial conical, cylindrical, and straight section being convex or straight toward said second inner wall section to define at least one second exhaust flow path therebetween adapted to receive exhaust gases and guide same to release upwardly through said second upper air outlet, the first and second exhaust flow paths converging;
- a second inner sheath disposed adjacent the portion of the second inner wall section comprising the perforated material to define a second inner enclosed space;
- acoustically absorbing media disposed in the first and second outer enclosed spaces and the first and second inner enclosed spaces;
- at least one first end wall extending from said first inner wall section to said first outer wall section to confine gases passing therebetween within said first exhaust flow path, said first exhaust flow path passing the first outer enclosed space and the first inner enclosed space to absorb noise through the sections comprising the perforated material into the acoustically absorbing media;
- and
- at least one second end wall extending from said second inner wall section to said second outer wall section to confine gases passing therebetween within said second exhaust flow path, said second exhaust flow path passing the second outer enclosed space and the second inner enclosed space to absorb noise through the sections comprising the perforated material into the acoustically absorbing media.
An exhaust fan apparatus comprising a housing having an upper portion and a lower portion, wherein the lower portion includes a centrifugal fan scroll casing, the scroll casing having parallel side walls, a shaft extending within the casing normal to the side wall and mounting an impeller for rotation therewithin, motor means for driving the shaft, an inlet port provided axially of the fan shaft axis on a side wall of the casing, a discharge port extending from the scroll, a first tubular diffuser portion communicating with the fan discharge port and a second tubular portion extending upwardly from the first tubular portion, the second tubular portion being bifurcated to provide at least two passageways having generally parallel axes generally normal to the axis of the fan shaft, and wherein the axes of the passageways lie in a plane which is parallel to the axis of the fan, each of the two passageways having an inner wall section and an outer wall section comprising a perforated material, a first outer sheath disposed adjacent the portion of the first outer wall section comprising the perforated material to define a first outer enclosed space, a second outer sheath disposed adjacent the portion of the second outer wall section comprising the perforated material to define a second outer enclosed space, a first inner sheath disposed adjacent the portion of the first inner wall section comprising the perforated material to define a first inner enclosed space, a second inner sheath disposed adjacent the portion of the second inner wall section comprising the perforated material to define a second inner enclosed space, acoustically absorbing media disposed in the first and second outer enclosed spaces and the first and second inner enclosed spaces, wherein noise is passed through the sections comprising the perforated material into the acoustically absorbing media.
Dependencies are inferred from the claim text.