Exhaust muffler capable of automatically adjusting overflow area

Abstract

The invention discloses an exhaust muffler capable of automatically adjusting the overflow area, which comprises an air inlet pipe, an expansion chamber and an air outlet pipe, wherein the inner circle of the section (provided with radial through-holes) of the air inlet pipe is provided with a piston which can slide to and fro along the inner wall of the pipe, and the front end of the piston faces the air inlet direction, while the rear end is provided with a pressure spring which can apply pressure (with a direction opposite to the air inlet direction) to the rear end. The invention adopts a structure that the exhaust pipe section of the air inlet pipe is provided with the piston which divides the exhaust pipe section into an exhaust part and a closed part, the position of the piston can be automatically adjusted according to the exhaust pressure and the piston can reset under the action of the spring when the exhaust pressure is low; therefore, the exhaust muffler has the advantages of adjusting the area of the airflow ventilating section according to the exhaust gas flow of an engine under different working conditions, keeping the exhaust airflow in an even flow velocity, effectively lowering the exhaust backpressure, reducing the regenerated noise of the airflow, improving the erasure effect of the muffler, and having a positive significance for reducing the fuel consumption and carbon dioxide emission of an automobile.

Description

technical field [0001] The invention relates to an accessory part of an automobile, in particular to an exhaust muffler which can automatically adjust the flow area. Background technique [0002] Traffic noise is the noise generated during the driving of motor vehicles, and it is the main noise source in urban environmental noise; while automobile exhaust noise is the main noise source of automobile noise, and it is also the focus of urban environmental noise control. [0003] In order to reduce exhaust noise, motor vehicles generally use exhaust mufflers to exhaust, and mufflers are also the most effective noise reduction means commonly used to control exhaust noise. In the prior art, the silencing performance of basically all engine exhaust mufflers depends on fixed structural parameters, and the silencing frequency cannot be automatically adjusted with changes in engine operating conditions, and is always in a passive state; while the exhaust flow of the engine varies wit...

AI Technical Summary

Problems solved by technology

However, the main problem of this device is that the structure is relatively complicated, and the cross-sectional area of ​​the air flow cannot be adjusted, and the noise problem of the muffler under the condition of large exhaust flow rate cannot be fundamentally solved.

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