Exhaust muffler for supercharged diesel engine

Abstract

The invention discloses an exhaust muffler for a supercharged diesel engine. The exhaust muffler comprises an exhaust inlet pipe, an exhaust outlet pipe, a front intermediate pipe, a rear intermediatepipe, a left support plate, a right support plate, a left cavity, a middle cavity and a right cavity. The left side of the muffler is connected with the exhaust inlet pipe, and the right side of themuffler is connected with the exhaust outlet pipe. The exhaust inlet pipe and the intermediate pipes are of a straight-through perforated pipe structure. The exhaust outlet pipe is a flow-blocking perforated pipe, and perforated protection plates are correspondingly connected in the left cavity and the right cavity. The portions between the perforated protection plates and muffler wall plates arefilled with a sound absorbing material. The exhaust muffler has the characteristic of impedance compound noise elimination, can obtain excellent noise elimination effect in a wider frequency band on the premise of not increasing the exhaust pressure loss and is suitable for the exhaust noise control requirements of supercharged diesel engines with the large working condition variation range, displacement of 7-9 L and prominent noise pollution problems.

Description

technical field [0001] The invention relates to a noise reduction device for an engine exhaust system, in particular to a device capable of effectively reducing the exhaust noise of a supercharged diesel engine and used for controlling the exhaust noise of an internal combustion engine, and belongs to the technical field of atmospheric environment protection related to exhaust noise control. Background technique [0002] Due to its superior power and economy, diesel engines are widely used in power plants for commercial vehicles, construction machinery, ships, etc. Exhaust noise is the most important noise source of diesel engines. Diesel engines have a high compression ratio and a high maximum explosion pressure. Generally, exhaust noise pollution is more serious than gasoline engines. During use, it has a greater impact on the surrounding environment and is an important source of urban noise pollution. source. Therefore, the noise reduction ability of the exhaust system h...

AI Technical Summary

Problems solved by technology

At present, the country's restrictions on diesel engine pollutant emissions and noise are becoming increasingly strict, making it difficult for the noise reduction effect of exhaust mufflers used in existing supercharged diesel engines to meet the stricter national standard noise restrictions; Under the premise, to obtain a good noise reduction effect of the internal combustion engine from low frequency to high frequency range, it is necessary to optimize the internal structure and parameters of the exhaust muffler to obtain a higher exhaust noise reduction effect and improve the performance and noise reduction level of the muffler

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