CHAMBER NOISE MUFFLER OF INDUSTRIAL VACUUM CLEANER Russian patent published in 2018 - IPC F01N1/04 

FIELD: acoustics; instrumentation.

SUBSTANCE: invention refers to noise suppression technique. Muffler contains a cylindrical body, rigidly connected to the end inlet and outlet nozzles, and baffles, in the body, perpendicular to the direction of flow of the aerodynamic flow, at least two disk with holes, forming the chambers, are installed, wherein the orifices of the discs are alternately displaced relative to the axis of the housing in such a way, that the holes in the two adjacent discs do not coincide, while the body is internally lined with a sound-absorbing element, as well as discs are lined with sound-absorbing material from the direction of the aerodynamic flow, the casing is made of structural materials with a layer of soft vibrodempirating material, applied on its surface from one or two sides, for example VD-17 mastic or Gerlen-D type material, the ratio between the thickness of the liner and the vibration damping coating lies in the optimal range of values – 1: (2.5…3.5), a sound-absorbing element, which is internally lined body, is made in the form of a rigid and perforated walls, between which is a multilayer sound-absorbing element, 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 a material based on aluminum-containing alloys is used as a sound-reflecting material, followed by filling with titanium hydride or air with a density within 0.5…0.9 kg/m³ with the following strength properties: compressive strength within 5…10 MPa, bending strength within 10…20 MPa, for example foamed 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