NOISE SILENCER (VERSIONS) Russian patent published in 2013 - IPC F01N1/00 F02B77/13 

FIELD: machine building.

SUBSTANCE: noise silencer includes at least one dissipative porous sound-absorbing module with fibrous or foamed open-cellular structure with a protective sound transparent layer that is located in a closed cavity of a load-carrying shell-type cover of the type of an expanding or resonator chamber, to which supply inlet and discharge outlet branch pipes are connected. Inside the branch pipes there located are separating tubular and/or separating plate-like partition walls that include bypass channels presented with perforation holes or cells of a meshy base. Porous sound-absorbing module is formed with separate granulated fragmented sound-absorbing elements. They are made of identical or different types and makes of sound-absorbing materials, with identical or different physical characteristics, chemical composition, porosity, quantity and combination of types of structures of porous layers consisting of one/or multilayered combinations, identical or different geometrical shape and overall dimensions that are mainly in dimensional range of 5…100 mm, which are made from initial utilised raw material in the form of porous sound-absorbing structures of utilised parts technologically processed by means of a crushing method, which are removed from utilised technical objects, mainly of parts of noise insulating packs of mechanical transport vehicles that have completed their life cycle, and/or from technological wastes and rejection of porous sound-absorbing materials and parts from them. As per the second version of a noise silencer design a porous sound-absorbing module consists of initial raw material made in the form of a corresponding semi-finished product of porous sound-absorbing structure of fibrous or open-cellular material, mainly of flat-leaved type, as a result of further technological crushing/cutting/chipping operations related to it. Peculiar feature of the third independent version of the structural design of a noise silencer is that structural composition of its porous sound-absorbing module is represented with the formed mixture of specified dosed combinations of separate granulated fragmented sound-absorbing elements obtained in the form of products of secondary recycled utilised processing of porous sound-absorbing structures of materials (applied as per the first independent claim of the invention), to the composition of which there added is certain quantity of separate granulated fragmented sound-absorbing elements of certain geometrical shape and overall dimensions (used as per the second independent claim of the invention).

EFFECT: improvement of sound-absorbing properties, environmental characteristics of a technical device, economic and ecological efficiency and practicability of use of the proposed technical device.

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