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US 4,402,485 AGranted
Eccentrically nested tube gas line silencer
AssigneeFisher Controls Company, Inc.
InventorAllen C. Fagerlund
Life of this patent
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AssigneeFisher Controls Company, Inc.
InventorAllen C. Fagerlund
Estimating the term…
A device for attenuating noise of fluid in non-axisymmetric turbulent flow which comprises a conduit and a plurality of parallel aligned nested tubes in said conduit. The nested tubes are of varying cross-sectional size and have approximately the same cross-sectional shape. The tubes are eccentrically aligned with respect to each other such that a lower surface of each tube is in closely spaced relationship or is in substantially line contact with a surface of an adjacent tube along their longitudinal lengths, the line contact between all of the tubes being substantially at a common line, allowing for the thickness of the tube walls. A brace extends through and interconnects the nested tubes. In one embodiment, the noise attenuating device is spaced closely downstream from a reverse flow ball valve to provide a smooth transition from the non-axisymmetric flow discharging from the valve to substantially axisymmetric flow (or fully developed pipe flow) in the conduit downstream of the valve. The front of the tubes may be configured to lie in a plan generally transverse to the conduit. In another embodiment, the front of the tubes are configured to lie in a generated surface that is complementary to the exterior of the reverse flow ball valve.
A device for the attenuation of noise of fluid in non-axisymmetric turbulent flow comprising a conduit having inlet and outlet ends longitudinally disposed one from the other and disposed within said conduit a plurality of nested tubes of varying cross-sectional size but of substantially the same cross-sectional shape, each of said tubes having a longitudinal axis and each of said tubes being open at both ends for providing a longitudinal flow path through each tube and through the ends thereof, the longitudinal axis of each of said tubes being axially aligned in a plane through the longitudinal axis of said conduit, said tubes being eccentrically aligned with respect to each other such that a surface of each tube is in closely spaced relationship with a surface of each adjacent tube along their longitudinal lengths, and means for connecting the tubes, with the smallest nested tube being in axial alignment with the source of non-axisymmetric turbulent flow, whereby fluid enters all of the tubes substantially simultaneously and then substantially fills each tube in sequence, such that when the fluid exits from the device, all of the tubes are substantially filled.
A device for attenuation of noise of fluid in non-axisymmetric turbulent flow comprising a conduit having inlet and outlet ends and disposed within said conduit a plurality of nested tubes of varying cross-sectional size but of substantially the same cross-sectional shape, each of said tubes having a longitudinal axis, the longitudinal axis of each of said tubes being axially aligned in a plane through the longitudinal axis of said conduit, said tubes being eccentrically aligned with respect to each other such that a lower surface of each tube is in closely spaced relationship with a surface of each adjacent tube along their longitudinal lengths, each tube being slotted at the top and at the bottom, the top slot extending the length of the tube, and a brace extending through the top slots and connected to the tubes.
Dependencies are inferred from the claim text.