NOISE MUFFLER DEVICE IN PNEUMATIC SYSTEM OF STRAIGHTENING OF CUT-SUMMER MACHINE Russian patent published in 2018 - IPC F01N1/04 

FIELD: acoustics; instrumentation.

SUBSTANCE: invention refers to noise suppression technique. Muffler comprises a cylindrical body, rigidly connected to the end inlet and outlet nozzles rigidly connected to a central pipe having perforations, the outlet pipe is in the form of a disk, having at least three holes in the peripheral portion, and central pipe, with perforation in form of rectangular slots number of which is not less than three, is connected with central solid part of disc, and between the body and the central tube is located sound absorbing element so that the disk holes are connected to the cavity of the location of the sound-absorbing element, the sound-absorbing element is made in the form of a rigid and perforated walls, there is a multi-layer sound-absorbing element between them, which is made in the form of two layers: one of which, adjacent to the rigid wall, is sound-absorbing, and the other, that adjacent to the perforated wall, is made with a perforation from a sound-reflecting material of a complex profile consisting of uniformly distributed hollow tetrahedra, while as a sound-reflecting material, a material based on aluminum-containing alloys is used, followed by filling with titanium hydride or air with a density in the range of 0.5–0.9 kg/m³ with the following strength properties: compressive strength in the range of 5–10 MPa, bending strength within 10–20 MPa, for example, foam aluminum, or soundproofing plates based on a glass staple fiber of the type "Shumostop" with a material density of 60–80 kg/m³, or a material based on a magnesia binder with reinforcing fiberglass or glasscanvas.

EFFECT: higher efficiency of noise suppression.

1 cl, 2 dwg