SINGLE SOUND-ABSORBER FOR NOISE SUPPRESSOR Russian patent published in 2010 - IPC F01N1/00 

FIELD: machine building.

SUBSTANCE: noise suppressor is designed for suppressing noise of compressor stations and test boxes for gas-turbine engines. The noise suppressor consists of a cylinder frame made in form of a perforated bushing and of covers filled with sound absorbing material. A layer of acoustic transparent shell made out of capronic net or glass cloth is arranged outside the bushing. The frame is made of covers connected with the central rod with a perforated cylinder bushing consisting of two perforated shells - external and internal. Space between the shells is filled with sound absorber. Sound absorbing material inserted into the internal cavity of the sound absorber has higher porosity compared to sound absorber inside the shells and is made out of at least one profiled porous sheet. Profile of the sheet in cross section can be triangle, rectangular, trapezoid, in form of arcs of circumferences, or sinusoidal. Also in case of two or more profiled porous sheets they can be arranged both with gaps between them or without the gaps. Side closed surfaces of the shells can be round, as in cylinder shape, but also triangle, polygon, ellipsoidal or of any combination of these figures.

EFFECT: increased efficiency of sound suppressing at low and middle frequencies.

3 dwg