Abstract A silencing apparatus comprising a casing; a plurality of silencing tube stages disposed within the casing, each of the stages having silencing tubes arranged parallel to each other and substantially filling a cross-section of the casing and parallel to the flow of gas, each of the stages being displaced longitudinally from each other within the casing; the silencing tubes comprising an outer tube, an inner tube disposed concentrically within the outer tube and leaving an annular space therebetween, and a sound-absorbing material disposed within the annular space; tubes of adjacent stages abutting and communicating in lateral offset relation so that noise-generating gases passing from adjacent stages are continuously divided and subdivided and passed inside and outside of the silencing tube in the second stage; and a third stage of the silencing tube disposed within the casing is displaced from the second stage so that noise of the gas is further modulated and dispersed and passed inside and outside of the silencing tube in the third stage thereby maximizing the area of the sound absorbing material in contact with the noise-generating gas to produce an increased sound-absorbing effect.
Inventors
👤 H Suzuki
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-31 15:08
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/08; F01N1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
286 words
A silencer for noise-generating gases comprising: an elongated casing opening axially from end-to-end, said casing having a closed outer wall and a porous inner wall spaced from the outer wall and a sound-absorbing material disposed therebetween; a plurality of individual silencing tubes disposed in axially spaced stages extending along the length of said casing, each of the stages of the silencing tubes comprising a plurality of mutually parallel, peripherally engaged individual tubes disposed parallel to the longitudinal axis of the casing and the gases passing therethrough, the plurality of tubes of each of the respective stages substantially filling the cross section of the casing in which they are disposed, each of the tubes of an upstream stage of tubes being laterally offset so that the longitudinal axis thereof is offset with respect to tubes of a next adjacent stage of tubes, the ends of adjacent tubes of adjacent stages of tubes abutting so that gases leaving an upstream tube pass interiorally and exteriorally of next adjacent tubes of the next adjacent stage of tubes, so that the individual tubes continuously divide the streams of gas entering the casing from the inlet and subdivide and modulate the streams of gas as it moves in individual streams from stage-to-stage, each of the individual tubes comprising concentric, perforated, axially spaced sleeves with sound-absorbing material in the space therebetween, said tube sleeves being connected at opposite ends by annular collars converging axially from opposite ends of the individual silencing tubes whereby sound generated by the gases passing through the silencing tubes is absorbed by the sound-absorbing material of the casing and individual tubes as the paths of travel of the gases is continuously altered and frequency is changed from stage-tostage.
Claim 2
Dependent Claim
286 words
A silencer for noise-generating gases comprising: an elongated casing opening axially from end-to-end, said casing having a closed outer wall and a porous inner wall spaced from the outer wall and a sound-absorbing material disposed therebetween; a plurality of individual silencing tubes disposed in axially spaced stages extending along the length of said casing, each of the stages of the silencing tubes comprising a plurality of mutually parallel, peripherally engaged individual tubes disposed parallel to the longitudinal axis of the casing and the gases passing therethrough, the plurality of tubes of each of the respective stages substantially filling the cross section of the casing in which they are disposed, each of the tubes of an upstream stage of tubes being laterally offset so that the longitudinal axis thereof is offset with respect to tubes of a next adjacent stage of tubes, the ends of adjacent tubes of adjacent stages of tubes abutting so that gases leaving an upstream tube pass interiorally and exteriorally of next adjacent tubes of the next adjacent stage of tubes, so that the individual tubes continuously divide the streams of gas entering the casing from the inlet and subdivide and modulate the streams of gas as it moves in individual streams from stage-to-stage, each of the individual tubes comprising concentric, perforated, axially spaced sleeves with sound-absorbing material in the space therebetween, said tube sleeves being connected at opposite ends by annular collars converging axially from opposite ends of the individual silencing tubes whereby sound generated by the gases passing through the silencing tubes is absorbed by the sound-absorbing material of the casing and individual tubes as the paths of travel of the gases is continuously altered and frequency is changed from stage-tostage.