Damping-adjustable magneto-rheological piezoelectric exhaust silencer

Abstract

The invention relates to the field of exhausting and silencing equipment, in particular to a damping-adjustable magneto-rheological piezoelectric exhaust silencer. The damping-adjustable magneto-rheological piezoelectric exhaust silencer comprises a hollow barrel, and an air inlet pipe and an air outlet pipe are arranged along the two ends of the barrel. The barrel comprises a shell, glass wool and a perforated plate. The interior of the barrel is divided into a first cavity, a second cavity and a third cavity by a left separation plate and a right separation plate in the direction perpendicular to the axis of the barrel. The air inlet pipe communicates with the first cavity, and the air outlet pipe communicates with the third cavity. A rotary shaft coaxial with the barrel is arranged on the left separation plate, and a sound absorption blade is mounted on the rotary shaft stretching into the first cavity. The sound absorption blade is formed by bonding a piezoelectric crystal plate and a metal substrate, and a damping unit is arranged on the rotary shaft stretching into the second cavity. The damping-adjustable magneto-rheological piezoelectric exhaust silencer has the beneficialeffects that the kinetic energy of airflow is converted into mechanical energy through the sound absorption blade, and the sound absorption capacity is high; and power is supplied to the damping unitthrough electric energy generated through the piezoelectric effect, the structure is simple, and cost is reduced.

Description

technical field [0001] The invention relates to the field of exhaust muffler equipment, in particular to a magneto-rheological piezoelectric exhaust muffler with adjustable damping. Background technique [0002] The exhaust muffler is a device that prevents sound transmission and allows airflow to pass through, and is an important measure to eliminate aerodynamic noise. Exhaust muffler is a noise reduction device installed in the exhaust system of aerodynamic equipment (such as blower, air compressor, boiler exhaust, generator, water pump and other equipment with high exhaust noise). There are many types of exhaust mufflers, which are developed according to the principle of anti-spray and resistance compound noise reduction, mainly including small hole injection and expansion sound absorption. [0003] In the prior art, the exhaust muffler effect of the exhaust muffler is not satisfactory because of the following reasons: 1. Since each hole has its own natural frequency in ...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the exhaust muffler effect of the exhaust muffler is not satisfactory because of the following reasons: 1. Since each hole has its own natural frequency in the method of muffler based on small hole injection, there are only certain frequencies near the natural frequency of the mesh. The sound wave of the frequency can only pass through the mesh, so the sound absorption coefficient is low, the absorption frequency band is narrow, and it is not easy to control; 2. The sound absorption method based on impedance matching has a good effect on low frequencies and poor high frequency effects

Images