Sound-absorbing device, especially for damping of noises expanding in air ducts
First Claim
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1. A sound-absorbing device for use in the transmission of ventilating air, comprising:
- a prismatic elongated casing having a pair of end walls and a plurality of angularly adjoining longitudinal walls;
at least one air-flow duct of round cross section extending between said end walls and terminating therein while passing through said casing in all around spaced relation from said longitudinal walls; and
a mass of sound-absorbing material without parallel surfaces filling said casing between said end walls and around said duct, said sound-absorbing material having a thickness around said duct as measured in each plane perpendicular thereto which varies continuously about the periphery of the duct, said casing having a square cross section in said planes and said duct having a circular cross section in said planes and being conical from one of said end walls to the other, a plurality of such ducts being provided in spaced-apart relation within said casing and being all spaced from said longitudinal walls, said sound absorbing-material surrounding each duct in each such plane, said sound-absorbing material being subdivided by plates in said casing perpendicular to said ducts.
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Abstract
A flow duct for the delivery of air for ventilation is of round cross section and is surrounded by a prismatic casing over the length of the duct. Sound-absorbing material is filled into the space between the casing and the duct and varies in radial thickness around the periphery of the duct as measured in a plane perpendicular to the axis thereof.
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Citations
1 Claim
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1. A sound-absorbing device for use in the transmission of ventilating air, comprising:
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a prismatic elongated casing having a pair of end walls and a plurality of angularly adjoining longitudinal walls; at least one air-flow duct of round cross section extending between said end walls and terminating therein while passing through said casing in all around spaced relation from said longitudinal walls; and a mass of sound-absorbing material without parallel surfaces filling said casing between said end walls and around said duct, said sound-absorbing material having a thickness around said duct as measured in each plane perpendicular thereto which varies continuously about the periphery of the duct, said casing having a square cross section in said planes and said duct having a circular cross section in said planes and being conical from one of said end walls to the other, a plurality of such ducts being provided in spaced-apart relation within said casing and being all spaced from said longitudinal walls, said sound absorbing-material surrounding each duct in each such plane, said sound-absorbing material being subdivided by plates in said casing perpendicular to said ducts.
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Specification
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Current AssigneeFutober Epuletgepeszeti Termekeket Gyarto Vallalat
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Original AssigneeFutober Epuletgepeszeti Termekeket Gyarto Vallalat
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InventorsKiss, Sandor, Nagy, Zsolt
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Primary Examiner(s)Wintercorn, Richard A.
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Assistant Examiner(s)Fuller, Benjamin R.
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Application NumberUS05/894,375Time in Patent Office970 DaysField of Search181/212, 181/217, 181/218, 181/219, 181/222, 181/224, 181/203, 181/248, 181/256, 181/252, 181/264US Class Current181/224CPC Class CodesF16L 55/0336 by means of sound-absorbing...F24F 13/0281 Multilayer ductF24F 2013/242 Sound-absorbing material
