MULTI-SECTION NOISE SUPPRESSOR Russian patent published in 2018 - IPC F01N1/00 

FIELD: engine building.

SUBSTANCE: invention relates to compressor stations and test boxes for gas turbine engines noise suppression equipment. Muffler contains a cylindrical base, rigidly connected to the end inlet and outlet nozzles, rigidly connected to the central partitions, that have the perforation, the base leveling grid is arranged, it is connected to the adapter, on which the sound-absorbing unit is fixed, consisting of separate series-connected sections is fixed, each of which is made with sound-absorbing lining, while single sound absorbers are made in the form of a perforated sleeve and covers, filled with a sound absorber, the layer of acoustic transparent shell made of capron mesh made of glass cloth is arranged outside of bushing, and the frame comprises covers with circular collars for cylindrical bushing fixing, where the covers are connected by the central rod to the hooks at both ends, and the cylindrical bushing consists of two perforated shells, outer and inner, the space between them being filled with a sound absorber containing perforated walls, between which there are layers of sound-reflecting, as well as sound-absorbing materials of different density are arranged, located in two layers, wherein the sound-reflecting material layers are made with complex shape, consisting of uniformly distributed hollow tetrahedrons allowing to reflect the incident in all directions sound waves, and which are located respectively at the perforated walls, and the layers of the sound-reflecting material are made of a heat-insulating material.

EFFECT: technical result is the noise suppression increased efficiency.

1 cl, 4 dwg