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

FIELD: acoustics; manufacturing technology.

SUBSTANCE: invention relates to noise suppression. Silencer comprises a cylindrical housing, rigidly connected with end inlet and outlet pipes, sound absorber located between cylindrical housing and perforated element, and an acoustically transparent material, placed between perforated element and sound absorber. Sound absorber is made in the form of a sound-absorbing element of the ring type and in the axial section is made in the form of a ring whose walls are made in the form of a rigid and perforated walls, a sound-reflecting layer adjoining the rigid wall, and a sound-absorbing layer adjoining the perforated wall, wherein sound reflecting material layer is made from complex profile composed of evenly distributed hollow tetrahedrons, allowing to reflect sound waves incident in all directions, and mineral wool is used on a basalt basis as a sound-absorbing material, according to the invention as a sound-absorbing material of a sound absorbing layer located between the cylindrical body and a perforated element, a porous sound absorbing ceramic material having a bulk density of 500÷1000 kg/m³, and consisting of 100 pts. wt. pearlite with a particle diameter of 0.5÷2.0 mm, 100÷200 pts. wt. of one or more sintering materials and 10÷20 pts. wt. of binding materials.

EFFECT: higher efficiency of noise suppression.

1 cl, 3 dwg