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US 5,473,124 AGranted
Packless silencer
AssigneeDipti Datta
InventorsMuammer Yazici, Werner Richarz
Life of this patent
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AssigneeDipti Datta
InventorsMuammer Yazici, Werner Richarz
Estimating the term…
A non-fibrous acoustic silencing duct member capable of attenuating noise associated with a gaseous medium passing through it. Perforated sidewalls define a gas flow passageway and include at least two opposing walls, each perforated with a number of small holes distributed over its surface. Exterior sidewalls are positioned on the outside of the perforated sidewalls and are spaced therefrom. Enclosed chambers are formed between the perforated and exterior sidewalls, which chambers are of selected depths. One or more screen layers extend along and adjacent to outer surfaces of the perforated sidewalls, these screen layers being located in the chambers. Each screen layer is covered with an array of very small holes that are substantially smaller than the holes in the adjacent perforated sidewall. Internal dividers extend between each perforated sidewall and its respective exterior sidewall in order to divide the space between the sidewalls. In a preferred embodiment, the perforated sidewalls are made of sheet steel and the screen liners are metal screens.
A non-fibrous acoustic silencing duct member capable of attenuating noise associated with a gaseous medium passing through the duct member, said duct member comprising:
An acoustic silencer for use in a airflow duct for attenuating noise passing along said duct, said silencer comprising:
A sound attenuating duct unit for transmitting an airflow along an air duct, said unit comprising a housing having sidewalls surrounding an airflow passageway, an air inlet at one end of said passageway, and an air outlet at the other end thereof, said sidewalls including interior perforated walls extending along and defining said airflow passageway, said interior walls having a large number of small holes distributed over their surfaces, at least one layer of screen material disposed along an outer surface of one or more of said interior perforated walls away from said airflow passageway, wherein said sidewalls form enclosed chambers located along said outer surface of said one or more interior perforated walls.
A sound attenuating duct unit for transmitting an airflow along an air duct, said unit comprising a housing having sidewalls surrounding an airflow passageway, an air inlet at one end of said passageway, an air outlet at the other end thereof, and at least one airflow defining member in said housing and extending generally in the lengthwise direction of said passageway, said member having one or more perforated walls extending along and adjacent said passageway, the or each perforated wall having a large number of small holes distributed over its surface, and at least one layer of screen material disposed along a surface of the or each perforated wall away from the airflow passageway, wherein one or more enclosed chambers are positioned along the or each perforated wall on the side thereof opposite the airflow passageway.
Dependencies are inferred from the claim text.