An Automobile Muffler for Controlling Airflow Regeneration Noise

Abstract

The invention relates to an automobile muffler for controlling airflow regenerated noise. A first clapboard and a second clapboard axially vertical to a shell divide the interior of the shell into a first expansion cavity, a second expansion cavity and a dissipative muffler chamber; and an air inlet pipe, a transition pipe and an air outlet pipe are axially parallel to the shell and are arranged at intervals mutually. The air inlet pipe penetrates through a front end cover, the first clapboard and the second clapboard so as to be stretched into the second expansion cavity; one end of the air outlet pipe is located in the first expansion cavity; the air outlet pipe penetrates through the first clapboard, the second clapboard and a rear end cover and gets out; and one end of the transition pipe is located in the first expansion cavity, and penetrates through the first clapboard and the second clapboard so as to be stretched into the second expansion cavity. Micropores are formed in pipe walls of the air outlet pipe and the transition pipe in the dissipative muffler chamber; and the air outlet pipe in the second expansion cavity. An outlet end of the air inlet pipe is of an expansion port structure. Acoustic absorption cotton covers the shell, inner walls of the front end cover and the rear end cover, and the last section of the air outlet pipe. Airflow entering into the muffler is compressed and expanded for multiple times through three pipes and three chambers, and is in smooth transition, and the speed is gradually reduced, so that the airflow regenerated noise is obviously reduced.

Description

technical field [0001] The invention relates to automobile noise elimination technology, in particular to an automobile muffler for controlling airflow regeneration noise. Background technique [0002] With the improvement of environmental requirements, the restrictions on automobile noise in the environmental laws and regulations of various countries in the world are becoming increasingly strict. In order to adapt to the highly competitive auto market at home and abroad and the sustainable development needs of the society, auto designers and manufacturers are required to reduce the noise level of the car as much as possible without greatly affecting the power and economy of the engine. With the development of high-speed internal combustion engines, the problem of vehicle noise has become an important problem that has to be solved. Exhaust noise is the most important noise source in vehicle noise. [0003] Automobile muffler is an exhaust muffler device widely used in mode...

AI Technical Summary

Problems solved by technology

As the air velocity increases, the regenerative noise generated inside the muffler also increases

[0005] The regenerative noise has a huge impact on the performance of the muffler, and the actual noise reduction effect of the muffler drops sharply. When the regenerative noise is too large, the muffler will lose its muffler effect, and in severe cases, the muffler will even become a noise amplifier.

Images