ELEMENT OF NOISE MUFFLER BY KOCHETOV Russian patent published in 2014 - IPC F16L55/33 

FIELD: machine building.

SUBSTANCE: in a noise muffler element, comprising a body with a flap cover, filled with a sound-absorbing material, placed into a protective shell, walls of the body are formed with a sound-absorbing structure, made in the form of 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 from the foamed sound-absorbing material, for instance, a construction sealing foam, and is arranged between the first, stiffer one, layer and the perforated surface of the sound-absorbing element.

EFFECT: improved acoustic characteristics in the field of lower, medium and higher frequencies.

6 cl, 2 dwg