Internal combustion engine exhaust silencer with variable exhaust pipe cross section

Abstract

The exhaust silencer with variable exhaust pipe cross section of internal combustion engine includes one casing, one air inlet silencing pipe and one exhaust silencing pipe inside the casing cavity, three partition boards set inside the cavity to separate the cavity into four chambers and one intermediate silencing pipe. The air inlet silencing pipe has its closed end penetrating the front end cap, the first partition board and two chambers and combining with the second partition board. The exhaust silencing pipe includes two pipes of different lengths and sizes, their closed ends penetrate the back end cap and the last chamber and combine with the third partition board, and the large and short pipe has one exhaust control valve in the opened end. The intermediate silencing pipe has its opened end located inside the second chamber and the closed end inside the third chamber.

Description

technical field [0001] The invention relates to a muffler, in particular to an exhaust muffler for an internal combustion engine with a variable cross-sectional area of ​​the exhaust pipe which can automatically control the cross-sectional area of ​​the exhaust pipe. Background technique [0002] Exhaust mufflers for internal combustion engines of the prior art are mostly single-pipe structure (an exhaust pipe is housed), and a few are two-pipe structure (two exhaust pipes are housed). Whether one or two exhaust pipes are installed, their cross-sectional areas are fixed. That is to say, the exhaust pipe in the prior art cannot change the flow area of ​​the exhaust pipe with the change of the exhaust flow. Specifically, for the internal combustion engine exhaust muffler that uses a relatively long and slender pipe as the exhaust pipe, although it can meet the requirements under medium load and medium speed, and the noise is reduced, when the internal combustion engine enters...

AI Technical Summary

Problems solved by technology

That is to say, the exhaust pipe of the prior art cannot change the flow area of ​​the exhaust pipe with the change of the exhaust flow.

Specifically, for the internal combustion engine exhaust muffler that uses a relatively long and slender pipe as the exhaust pipe, although it can meet the requirements under medium load and medium speed, and the noise is reduced, when the internal combustion engine enters into heavy load and high speed operation, due to exhaust As the flow rate increases, the exhaust velocity increases, the resistance increases, and the regenerative noise generated by the airflow also increases significantly, resulting in an increase in noise and power loss.

Conversely, for internal combustion engine exhaust mufflers using shorter and thicker pipes, although they can meet the requirements of heavy load, high speed and low noise, when running under medium load and medium speed, the noise will increase instead.

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