CHAMBER NOISE MUFFLER Russian patent published in 2014 - IPC F01N1/18 G10K11/00 

FIELD: machine building.

SUBSTANCE: muffler comprises a cylindrical body, rigidly connected to the end inlet and outlet nozzles, with a central partition, the body from inside is lined with a sound-absorbing structure, and the central partition is made in the form of a sound-absorbing element, having a carcass, which at two sides is lined with a sound-absorbing material, besides, the carcass of the sound absorbing element may rotate in the plane perpendicular to the direction of movement of an aerodynamic flow, and the sound-absorbing structure is made from three layers of the sound-absorbing material, at the same time the first layer, a stiffer one, is made as solid and profiled and is fixed on the smooth surface, and the second layer, a softer one, compared to the first one, is made as interrupted and is arranged in the focus of the sound-reflecting surfaces of the first layer, and the third layer of the sound-absorbing element is made of a foamed sound-absorbing material, for instance, construction sealing foam, and is arranged between the first stiffer layer and perforated surface of the sound-absorbing element.

EFFECT: increased efficiency of noise muffling.

6 cl, 2 dwg