KOCHETOV MULTI-SECTION SILENCER Russian patent published in 2010 - IPC F02C7/24 F01N1/24 

FIELD: engines and pumps.

SUBSTANCE: multi-section noise silencer includes cylindrical base with levelling grid arranged on it and connected to the adapter on which there fixed is sound-absorbing unit consisting of separate in-series connected sections, each of which is made from the layer of sound-absorbing material, which is lined from inside with perforated cover. Each section consists of four subsections in which there located are single sound-absorbers consisting of the housing made in the form of side closed surfaces with a bottom and hinged cover, which are made from perforated stainless steel sheet or zinc-coated sheet 0.7 mm thick with polymer protective decorative coating of Pural type 50 mcm thick or Polyester 25 mcm thick or aluminium sheet 1.0 mm thick and the coating 25 mcm thick. Coaxially to the housing and at equal distance from its inner surfaces there arranged is hollow chamber made of perforated sheet, and between the housing walls and the chamber there arranged is sound-absorbing construction made in the form of perforated coaxial external and internal covers between which there located is sound absorber made at least of one shaped porous sheet. Profile of the sheet in section can be triangular, rectangular, trapezoidal, in the form of circles, sine-shaped, and in case of two and more profiled porous sheets, they can be located both with gaps between them, and without gaps. Side closed surfaces of the housing and coaxial covers of sound-absorbing construction can have in section also the shape of triangle, polygon, ellipse or circle. As sound-absorbing material of sound absorber, there used is porous noise-absorbing material, for example foam aluminium or metal-ceramics, or metal polyurethane foam, or in the form of pressed chips from solid vibro-damping materials, for example elastomer, polyurethane or plastic compound like Agat, Antivibrit, Shvim. Size of chips fraction is in the range of the values: 0,3…2.5 mm.

EFFECT: invention allows increasing noise reduction efficiency.

5 dwg