Sound-attenuating ventilation
First Claim
1. A sound-attenuating ventilation louver for location in an opening of a wall which separates a chamber containing a noise source from the external environment, said louver comprising a frame and a plurality of horizontally disposed profiled slats supported by said frame and so arranged that in the operative orientation of the louver in said opening, each slat slopes upwardly across its width away from said external environment whereby a first one of the two major surfaces of said slat faces upwardly towards said environment while the second one of said two major surfaces faces downwardly towards said chamber, each said slat being in the form of an aerodynamically-shaped blade the two major surfaces of which are connected by curved end sections of convex profile, each said slat comprising:
- a solid portion formed from sound-absorbent material and extending from an intermediate zone of the slat to the longitudinal edge thereof which in the operative orientation of the louver is nearest the said chamber containing the noise source, anda wall of rigid material defining a hollow portion extending from said intermediate zone to the longitudinal edge of said slat which in the operative orientation of the louver is nearest the said external environment, said hollow portion being sub-divided into a plurality of chambers each of which acts as a resonator and is in communication with the atmosphere through at least one hole defined in said wall.
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Accused Products
Abstract
A sound-attenuating ventilation louver is provided for location in an aperture of a wall which separates a chamber containing a source of noise from the external environment, the purpose of the louver being to allow gaseous flows to pass into and out of the chamber while minimizing the noise passing out through the louver from the noise source. The louver includes a plurality of profiled slats each in the form of an aerodynamically-shaped blade. Each slat includes a solid portion made of a sound-absorbent material and a hollow portion defined by a thin wall of rigid material; in use of the louver the sound-absorbent solid portion of each slat is disposed towards the chamber containing the noise source while the hollow portion is disposed towards the external environment. The hollow portion of each slat is subdivided into a plurality of chambers communicating with the atmosphere through ports and acting as resonators.
64 Citations
12 Claims
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1. A sound-attenuating ventilation louver for location in an opening of a wall which separates a chamber containing a noise source from the external environment, said louver comprising a frame and a plurality of horizontally disposed profiled slats supported by said frame and so arranged that in the operative orientation of the louver in said opening, each slat slopes upwardly across its width away from said external environment whereby a first one of the two major surfaces of said slat faces upwardly towards said environment while the second one of said two major surfaces faces downwardly towards said chamber, each said slat being in the form of an aerodynamically-shaped blade the two major surfaces of which are connected by curved end sections of convex profile, each said slat comprising:
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a solid portion formed from sound-absorbent material and extending from an intermediate zone of the slat to the longitudinal edge thereof which in the operative orientation of the louver is nearest the said chamber containing the noise source, and a wall of rigid material defining a hollow portion extending from said intermediate zone to the longitudinal edge of said slat which in the operative orientation of the louver is nearest the said external environment, said hollow portion being sub-divided into a plurality of chambers each of which acts as a resonator and is in communication with the atmosphere through at least one hole defined in said wall. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification