A magneto-rheological exhaust muffler with automatic cavity adjustment

Abstract

The invention relates to the field of exhaust silencer, and particularly relates to a magnetorheological exhaust silencer for adjusting a cavity automatically. The magnetorheological exhaust silencercomprises a hollow cylindrical barrel, wherein an air inlet tube and an air outlet tube are respectively arranged at two sides of a barrel axis, a left separation board and a right separation board divides interior of the cylindrical barrel into a first cavity, a second cavity and a third cavity in a direction vertical to the barrel axis, the air inlet tube is communicated with the first cavity, the air outlet tube is communicated with the third cavity, a left piston and the right separation board are uniformly provided with left circulation holes and right circulation holes, the left piston is fixedly provided with a piston rod coaxial with the barrel, piezoelectric vibrators are sleeved on a thin shaft of the piston rod extending into the first cavity, each piezoelectric vibrator is formed by bonding annular piezoelectric ceramic and a metal base, the second cavity is internally provided with a cylinder which is coaxial with the barrel and has a cylindrical inner cavity, and the inner cavity of the cylinder is filled with magnetorheological liquid. The magnetorheological exhaust silencer for adjusting the cavity automatically has the advantages and characteristics that (1) the piezoelectric vibrator converts sound energy into mechanical energy, so that the magnetorheological exhaust silencer has high sound absorption performance and is highly reliable; (2) the volume of the cavity and damping force of the right piston are adjusted automatically according to rotating speed of a motor, so that the magnetorheological exhaust silencer absorbs sound dynamically and actively, and the structure of the silencer is simple; and (3) low-frequency sound wave is absorbed through piezoelectric ceramic, a perforated board and glass cotton cooperate with each other to absorb high-frequency sound wave, thereby widening the absorption band.

Description

technical field [0001] The invention relates to the field of exhaust muffler equipment, in particular to a magneto-rheological exhaust muffler for automatically adjusting a cavity. Background technique [0002] With the improvement of the degree of industrialization, the degree of noise hazards is increasing. Traffic noise has become the most important noise source in the current urban environmental noise, while exhaust noise is the main noise source of automobile engines. The exhaust muffler prevents sound transmission and allows airflow to pass through. A device is an important measure to eliminate aerodynamic noise. There are many types of exhaust mufflers, and the muffler performance of most exhaust mufflers depends on fixed structural parameters. In the prior art, the exhaust silencer effect of the exhaust muffler is not ideal, the reason is that: the exhaust noise of the engine changes with the speed of the engine, and the silencer frequency of the exhaust muffler can...

AI Technical Summary

Problems solved by technology

In the prior art, the exhaust silencer effect of the exhaust muffler is not ideal, the reason is that: the exhaust noise of the engine changes with the speed of the engine, and the silencer frequency of the exhaust muffler cannot be automatically adjusted with the change of the engine speed, so the sound absorption coefficient is low. The absorption frequency band is narrow and difficult to control

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