Axial-Flow Air Fan Silencer
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Jan-31
A silencer for an axial-flow air fan comprises an air exhaust duct into one end of which the fan feeds air, and which includes an enclosed resonant cavity having an exchangeable apertured plate between it and the air passage in the duct. A machinery container 1 has an endwall 2 through which is formed an exhaust hole 3 for air circulated by an axial-flow air fan (not shown). Upon the wall 2 is secured an air exhaust duct 4 into which the hole 3 feeds exhausted air. The duct 4 is an open-sided box and supports a central dividing wall 5 of which the portion opposite the hole 3 is of foamed plastic construction to absorb and restrain vibrations in the air entering the duct 4.