SU1629576A1

SU1629576A1 - Noise suppresor

Info

Publication number: SU1629576A1
Application number: SU884624927A
Authority: SU
Inventors: Владимир Алексеевич Алексеев
Original assignee: Белгородский Экспериментальный Литейно-Механический Завод
Priority date: 1988-12-26
Filing date: 1988-12-26
Publication date: 1991-02-23

Abstract

Изобретение позвол ет повысить эффективность шумопоглощени во всем частотном диапазоне путем интерференции. Выхлопные газы через впускной патрубок поступают в расширительную камеру 7, где, расшир сь, тер ют часть своей энергии и создают в камере 7 избыточное давление по сравнению с давлением в интерференционА -А ной камере 8. При этом газы и звуковые колебани , поступа в камеру 8, отражаютс от ее стенки по закону отражени от эллиптических поверхностей параллельно большей оси эллипса. Причем на различных частотах выхлопа отраженные звуковые составл ющие подвергаютс интенсивной и беспор дочной интерференции, значительно ослабл ющей звуковые колебани во всем частотном диапазоне выхлопа. Из камеры 8 газы через отверсти перфорации среднего р да 9 перегородки 4 поступают в приемный газоход 10 в направлении, перпендикул рном распространению звуковых волн, т. е. из зоны наименьшего звукового давлени , и далее через выпускной патрубок 3 выбрасываютс в атмосферу. 3 з. п. ф-лы, 4 ил. сл сThe invention makes it possible to increase the efficiency of noise absorption in the entire frequency range by interference. Exhaust gases through the inlet pipe enter the expansion chamber 7, where, expanding, they lose some of their energy and create an overpressure in chamber 7 compared to the pressure in the interference-A chamber 8. At the same time, gases and sound vibrations entering the chamber 8, are reflected from its wall by the law of reflection from elliptic surfaces parallel to the major axis of the ellipse. Moreover, at various exhaust frequencies, the reflected sound components undergo intense and random interference, which significantly attenuates sound vibrations in the entire frequency range of the exhaust. From chamber 8, gases through the perforations of the middle row 9 of the partition 4 enter the receiving gas duct 10 in the direction perpendicular to the propagation of sound waves, i.e., from the zone of lowest sound pressure, and then through the outlet nozzle 3 to the atmosphere. 3 h. the item of f-ly, 4 ill. cl

Description

ршт. 1psh. one

Направление распространени звуков, колебанийDirection of propagation of sounds, vibrations

Первичные. з8уко8ые колебани Primary. fluctuations

Фиг.ЪFIG.

Направление отраженных зВукоВьм колебанийDirection of reflected sound

Claims

. Claim

1, A noise suppressor comprising a housing 1 with inlet and outlet nozzles and a longitudinal perforated partition dividing the housing into chambers, characterized in that _1iL in order to increase the noise _reduction efficiency in the entire 1 frequency range, the housing is equipped with end walls and is made with a cross section in the form ellipse, the partition is placed in the plane of the larger axis of the ellipse of the cross section of the housing with the formation of the expansion and interference chambers, the nozzles are placed in the end walls in the area of the expansion chamber, about perforation., partitions are arranged longitudinally in three * rows, the middle row of holes is placed along the axis of the housing in the area of the intake duct formed by a shell sealed to the partition from the side of the expansion chamber and connected to the outlet pipe, with the outermost rows of perforation holes ellipse of the cross section of the corus. · pus.

2. A silencer according to claim 1, characterized in that the gas duct is made of variable cross-section.

.

3. The muffler according to paragraphs. 1 and 2. characterized in that the gas duct is made with a cross-sectional area increasing towards the exhaust pipe.

4. The muffler according to paragraphs. 1-3, distinguished by the fact that the total area of the perforation holes of the extreme rows is equal to the total area of the perforation holes of the middle row.

Direction of reflected sound vibrations

Fig.y