Pressure Adaptive Low Frequency Broadband Elastic Resonance Muffler

Abstract

A pressure self-adaptation low-frequency broadband elastic resonance noise-abatement device comprises a liquid pipeline. An opening in the pipe wall of the liquid pipeline is communicated with a sealing cavity on the outer side through a cavity neck, the opening end of the cavity is sealed by an elastic wall board and a sealing pad, a flange part is arranged at the end of a shell of the cavity, the elastic wall board and the sealing pad are connected with the flange part of the cavity in a fastening mode, the other side of the elastic wall board is connected with a compression ring in a sealing mode, or the other side of the elastic wall board is connected with a hollow shell with a backpressure cavity in a sealing mode, high-pressure gas or liquid is filled into the backpressure cavity, and when liquid is filled into the backpressure cavity, viscoelastic damping rubber or noise absorbing rubber needs to be bonded on the inner wall surface of the backpressure cavity. The pressure self-adaptation low-frequency broadband elastic resonance noise-abatement device can achieve low-frequency noise abatement of the liquid pipeline and is small in structure size, the pressure self-adaptation low-frequency broadband elastic resonance noise-abatement device is used according to noise-abatement frequency combination, therefore, broadband noise abatement can be achieved, and the using requirement for bearing the pressure of a flow channel in the pipeline can be also met.

Description

technical field [0001] The invention relates to a resonant cavity muffler, in particular to the noise control applied to liquid pipelines of dense medium liquids such as water medium and the low-frequency noise reduction of sound-absorbing baffles in underwater structures. Background technique [0002] The resonant cavity muffler is usually installed on the wall of the pipeline or the wall that needs to take sound absorption. The acoustic resonator is formed by the opening of the wall and the external sealed resonant cavity. Absorption and reflection occur. When the frequency of the incident sound wave is the same as the oscillation frequency of the medium in the cavity, the acoustic medium in the cavity resonates, and a higher sound absorption effect is produced at this frequency. The wavelength of the sound absorption frequency is 4 times the acoustic length of the tube. To achieve low-frequency sound absorption, a longer resonant cavity is required. To solve this problem,...

AI Technical Summary

Problems solved by technology

For the noise control of heavy medium liquids such as water medium, under the same noise-abneance frequency condition, due to the extremely poor compressibility of water, and the wavelength of sound waves in water is more than four times the wavelength of sound waves in air, the Helmholtz resonant cavity muffler is used , a larger size cavity is required, which is often limited by space when installed in water medium and other liquid pipelines, and the space utilization rate is extremely low. Therefore, compared with air low-frequency noise reduction, in water medium and other liquid medium pipes In the middle of the road, it is difficult for the Helmholtz resonant cavity muffler to achieve low-frequency noise reduction, and it is even more difficult to achieve low-frequency broadband noise reduction

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