Device capable of shortening wavelength of incident noise of silencer

Abstract

The invention provides a device capable of shortening wavelength of incident noise of a silencer, which has a simple structure and can increase the noise-reducing quantity of the silencer by reducingthe gas flow temperature. A cooling device capable of reducing the temperature of the incident gas flow and shortening the wavelength of the incident noise is arranged at a gas flow inlet end of the silencer, and the incident gas flow passes through the cooling device and enters the silencer. The acoustic wavelength of the incident noise propagated into the silencer along with the incident gas flow is shortened with the decrease of the temperature of the incident gas flow, and the penetrability of the incident noise is greatly reduced, thereby effectively preventing the incident noise from passing through the shell wall of a shell of the silencer to be propagated into the environment and cause sound pollution again. Since the wavelength of the incident noise is shortened, the incident noise can be absorbed well by a sound absorbing material in the silencer, and the noise-reducing quantity of the silencer is increased. Two cooling devices are adopted, namely water spray atomization anda heat exchanger. The two cooling devices are selected according to the temperature of the incident gas flow.

Description

technical field [0001] The invention relates to a large muffler, in particular to a cooling device which shortens the wavelength of incident noise by reducing the temperature of incident air flow. Background technique [0002] The most basic and main performance evaluation index of the muffler is: insertion loss (sound transmission loss), commonly known as "noise reduction". The muffler mainly plays the role of noise reduction and noise reduction. The larger the performance parameter, the better the performance. [0003] During the noise reduction process of the muffler in the prior art, the noise emitted by the noise source enters the muffler along with the air flow, and part of the noise will be absorbed by the sound-absorbing material in the muffler, while the other part of the noise will pass through the muffler shell wall or be absorbed by the muffler. The airflow discharge end of the muffler enters the surrounding air and continues to pollute the environment. [0004...

AI Technical Summary

Problems solved by technology

[0003] During the noise reduction process of the muffler in the prior art, the noise emitted by the noise source enters the muffler along with the air flow, and part of the noise will be absorbed by the sound-absorbing material in the muffler, while the other part of the noise will pass through the muffler shell wall or be absorbed by the muffler. The exhaust end of the muffler enters the surrounding air and continues to pollute the environment

[0004] In order to improve the noise reduction, the number or layout of the sound-absorbing body in the muffler is often improved in the prior art, but this kind of improvement idea may increase the air flow resistance of the muffler and affect other technical parameters of the muffler

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