SU1502859A1 - Muffler - Google Patents

Abstract

The invention relates to power engineering and reduces the size of the muffler. The silencer contains at least three resonators 1-3 with resonant frequencies F ₁ , F ₂ , F ₃ forming a geometric progression. The length of the pipes 4 connecting the resonators is: L _1-2 = (0.8-1.2) ^. C / (4√F ^_1. F ₂₎

L _2-3 = (0.8-1.2) ^. / (4√F ^_2. F _3). Moreover, when placing the resonator 3 between the resonators 1 and 2, the silencer length is reduced by a length L _{2-3 of the} connecting pipe 4 between the resonators 2 and 3. The noise suppressor is located between the gas ducts 5 and 6. 1 sludge.

Description

(L

3 .150285

The invention relates to mechanical engineering, in particular, to power engineering, in particular to noise suppressors of mainly power installations, for example, internal combustion engines.

The purpose of the invention is to reduce the size of the muffler.

The drawing shows a diagram of the Glu-10 noise noise noise switch with three resonators.

The silencer contains at least three resonators p, n + 1, with resonant frequencies forming a geometric progression f, f fn + t 5 and interconnected by means of pipes, the lengths of which, for example, between the resonators n and n + 1 with adjacent resonant frequencies are equal

1nN-P4G

K C / (f + O,

where C is the speed of sound, m / s; ff, adjacent resonant frequencies

Hz;

K is the coefficient of change in length (connecting pipes, equal to 0.8-1.2.

.Any resonator having a resonant frequency, beginning, for example, with a third frif in order of increasing, is located between the resonators n and n + 1, i.e. between the resonators with two previous lower frequencies.

The value of the coefficient of change of the length of the connecting pipes is taken equal to 0.8-1.2, based on the practical preservation of the effectiveness of the silencer in a given length range.

The ium silencer in the version with three resonators 1-3 with resonant frequencies ii, fU, f3, forming a geometric progression, provides the length of connecting pipes A, equal to

g

(0.8-1.2) С / (.

fj;

14-3 (0, & - 1,2) C / (f, j. Fj).

The length of the silencer noise decreased by the length of the connecting pipe 4 between the resonators 2 and 3. 50

0

five

0

five

0

five

The silencer is located between the gas ducts 5 and 6.

The muffler works as follows.

Claims (1)

The gas from the power plant from the gas duct 5 enters the muffler, where it passes through the connecting pipes 4, filling the resonators 1-3. From the silencer, the gas is withdrawn through the gas duct 6. Sound vibrations propagate along this path. Under the action of sound waves, the gas in the throat of each resonator oscillates and is forced into its bulk chamber. When the frequencies of the sound waves coincide with the tuning frequencies of the resonators 1-3, resonance phenomena occur. As a result, the silencer takes energy from sound waves at frequencies adjacent to the resonant frequencies of resonators 1-3. The performance of the silencer is characterized by wide-pole damping with maxima at the resonant frequencies. Formula invention A silencer, predominantly of a power plant, containing at least three resonators with resonant frequencies forming a geometric progression interconnected by means of pipes whose lengths 1 between the resonator and the neighboring resonant frequencies are 1 KC / (4Nif, f..i). where K is the coefficient of change. length equal to 0.8-1.2; С - sound speed, m / s; fr ,, f - adjacent resonant frequencies, Hz, characterized in that, in order to reduce overall dimensions, a resonator having a resonant frequency, starting from the third in order of increasing, is located between the resonators with the two previous lower frequencies.