초록 ▼

A sound attenuator for use in a rigid walled duct through which gas is to flow which comprises a cylindrical hollow shell within which is mounted a helical, sound absorbing, vane assembly. The interior of the wall of the shell is formed of a metallic wire screening. The shell itself is formed of a s

A sound attenuator for use in a rigid walled duct through which gas is to flow which comprises a cylindrical hollow shell within which is mounted a helical, sound absorbing, vane assembly. The interior of the wall of the shell is formed of a metallic wire screening. The shell itself is formed of a soft fiberglass mat for sound absorbing purposes. A similar fiberglass mat is included within each vane. Also, each vane includes a layer of lead.

대표청구항 ▼

A sound attenuator for use in a gas flow duct, said duct having a sheet material wall, said sound attenuator for diminishing the sound emitted into the ambient from the duct, said sound attenuator comprising: an outer hollow shell constructed primarily of a soft material, said shell having an intern

A sound attenuator for use in a gas flow duct, said duct having a sheet material wall, said sound attenuator for diminishing the sound emitted into the ambient from the duct, said sound attenuator comprising: an outer hollow shell constructed primarily of a soft material, said shell having an internal open-ended compartment, said shell to be located within said duct with said shell snugly abutting against the wall of said duct; a tubular frame, said tubular frame being substantially rigid, said tubular frame being located within said shell against the wall of said shell; and a sound absorbing vane assembly mounted within said internal compartment, said vane assembly defining an elongated helical path.