COMBINED KOCHETOV'S NOISE SUPPRESSOR Russian patent published in 2017 - IPC F01N1/04 

FIELD: machine engineering.

SUBSTANCE: suppressor contains the cylindrical body, rigidly connected to the end inlet and outlet branch pipes, the diameter of which is not less than the body diameter and the sound-absorbing cylindrical insert, mounted along the axis of the suppressor; the conical-shaped air cowl is fixed at each of the perforated cylindrical insert end faces, and the cylindrical insert is fixed to the body by means of at least two stiffeners located in the plane perpendicular to the suppressor axis. The outer surface of the cylindrical insert is perforated, and the sound absorber and the acoustically transparent material are located inside the insert. The sound-absorbing cylindrical insert is made hollow and in the axial section is made in the form of the rigid and perforated walls, between which there are two layers: the sound-reflecting layer, adjacent to the rigid wall, and the acoustic layer adjacent to the perforated wall. The sound reflecting material layer is made of the complex profile, consisting of the evenly distributed hollow tetrahedra.

EFFECT: noise suppression efficiency improvement.

4 dwg