Air duct and method of making same
First Claim
1. An air conveying duct comprising a wall which is formed into a closed profile extending from a first end to a second end in order to convey air therethrough,the wall having an intermediate layer of noise attenuating foam with inner and outer surfaces, an outer layer of material disposed on the outer surface of and reinforcing the foam, and an inner layer of material secured to the inner surface of the foam and sealing off the foam from the air but allowing noise to be absorbed by the foam, wherein the material of the inner layer and the material of the outer layer are dissimilar, and the outer layer of material includes an overlapping portion.
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Accused Products
Abstract
An air conveying duct has a foam core sealed on the inside and reinforced on the outside. The duct absorbs noise and neither introduces impurities into the air nor collects impurities from the air.
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Citations
16 Claims
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1. An air conveying duct comprising a wall which is formed into a closed profile extending from a first end to a second end in order to convey air therethrough,
the wall having an intermediate layer of noise attenuating foam with inner and outer surfaces, an outer layer of material disposed on the outer surface of and reinforcing the foam, and an inner layer of material secured to the inner surface of the foam and sealing off the foam from the air but allowing noise to be absorbed by the foam, wherein the material of the inner layer and the material of the outer layer are dissimilar, and the outer layer of material includes an overlapping portion.
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8. A method of making an air conveying duct from a sheet of foam, comprising the steps of:
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securing a reinforcing layer to a first side of the sheet of foam; providing notches in the sheet of foam in such a manner that the notches extend inward from a second, opposite side of the sheet of foam; securing an accoustically transparent sealant to the second side of the sheet of foam; and folding the sheet of foam along each of the notches in such a manner that the second side is inwardly directed and the first side is outwardly directed. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A foldable sheet for forming an air conveying duct comprising:
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an intermediate layer made of foam said foam including first and second ends, inner and outer surfaces, and a plurality of spaced notches formed in the inner surface and extending between the first and second ends to form a plurality of segments; a layer of reinforcing material, disposed on the outer surface of the foam, for reinforcing the foam; a layer of sealing material, secured to the inner surface of the foam, for sealing the foam in a manner that effectively seals off the foam from air but allows noise to pass through, said sealing material being disposed within said plurality of spaced notches, and being disposed over the first and second ends; and
the sealing material and the reinforcing material are dissimilar. - View Dependent Claims (15, 16)
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Specification