A high-efficiency environment-friendly automobile muffler and its noise reduction method

Abstract

The invention discloses an efficient and environment-friendly automobile muffler and a sound elimination method thereof. The efficient and environment-friendly automobile muffler comprises an outer barrel body and a sound absorption cavity formed in the outer barrel body, wherein a perforated air inlet tube of which air hole arrays are distributed at the two ends is arranged in the sound absorption cavity; an air inlet cavity baffle plate is arranged in the middle of the perforated air inlet tube; with the air inlet cavity baffle plate adopted as the boundary, the sound absorption cavity is divided into an air inlet cavity surrounded by first-grade foamed aluminium sound absorbing boards, and a middle cavity surrounded by second-grade foamed aluminium sound absorbing boards; and a middle cavity outer barrel is arranged at the outer parts of the second-grade foamed aluminium sound absorbing boards in a sleeving manner. According to the muffler structure, gases need to pass through multi-level damping loops composed of the perforated air inlet tube, the first-grade foamed aluminium sound absorbing boards, the second-grade foamed aluminium sound absorbing boards, the movable baffle plate, and the like, so that gases with higher kinetic energy are enabled to flow through more loops, the turbulent noise is effectively reduced, and a relatively high sound elimination capacity is achieved.

Description

technical field [0001] The invention relates to an exhaust muffler, in particular to an efficient and environment-friendly automobile muffler and a muffler method thereof. Background technique [0002] At present, the commonly used automobile exhaust mufflers are divided into resistive mufflers, resistive mufflers, and impedance composite mufflers. The resistive muffler uses the viscous action of the sound-absorbing material to convert the sound energy in the air into heat radiation, thereby reducing noise. It is mainly used to reduce the medium and high-frequency components of the exhaust noise, but the porous resistive material has the ability to absorb moisture. , easy weathering, pollution to the environment and other disadvantages, in the later stage, the noise reduction effect will be greatly reduced due to the clogging or aging of the resistive material in the environment with more impurities, high temperature and steam erosion in the automobile exhaust system. The r...

AI Technical Summary

Problems solved by technology

There is a contradiction between the noise reduction performance of the muffler and environmental protection, and there is a lack of a muffler with comprehensive performance such as broadband, environmental protection, and long life.

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