Impedance combined type silencer

Abstract

The invention discloses an impedance combined type silencer comprising a shell (1), wherein the shell (1) is of a cavity structure with a sound absorption layer (2) on the inner wall; a cavity at the lower part of the shell (1) is internally provided with a small hole jetting device (3) and a throttle pressure reduction device (4); the small hole jetting device (3) is positioned in the middle of the shell (1) and one cavity is formed between the small hole jetting device (3) and shell (1); the throttle pressure reduction device (4) is positioned in the middle of the small hole jetting device (3) and one cavity is formed between the throttle pressure reduction device (4) and the small hole jetting device (3); the lower end of the throttle pressure reduction device (4) is provided with an air inlet (5) communicated with external; a cavity at the upper part of the shell (1) is internally provided with a tubular honeycomb type sound absorption body (6); the upper part of the sound absorption body (6) is provided with an air outlet (7); and the lower part of the sound absorption body (6) is provided with a pored shelf (8). The impedance combined type silencer is compact in structure and has an excellent silencing effect on low to high frequency noise, thus being suitable to popularization and use.

Description

technical field [0001] The invention relates to a muffler, in particular to an impedance composite muffler. Background technique [0002] The muffler is a component that prevents sound transmission and allows airflow to pass through. It is an important measure to eliminate aerodynamic noise. The muffler is generally installed on the airflow channel of aerodynamic equipment or a noise reduction device in the intake and exhaust systems. And it can block the propagation of sound waves and allow the passage of airflow, which is an effective tool for controlling noise. There are many single resistive mufflers or resistant mufflers on the market today. The resistive muffler uses the sound-absorbing effect of the sound-absorbing material or the sound-absorbing structure to attenuate the noise propagating along the pipeline with the distance, so as to achieve the purpose of muffler. This kind of muffler has a good muffler effect on high-frequency noise. But the low-frequency noise...

AI Technical Summary

Problems solved by technology

The resistive muffler uses the sound-absorbing effect of the sound-absorbing material or the sound-absorbing structure to attenuate the noise propagating along the pipeline with the distance, so as to achieve the purpose of muffler. This kind of muffler has a good muffler effect on high-frequency noise. But the low-frequency noise reduction performance is poor; and the resistance muffler, by means of the sudden expansion (or contraction) of the pipe section or the side-connected resonant cavity, makes the sound waves of certain frequencies propagating along the pipe reflect in the direction of the source at the sudden change. , so as to achieve the purpose of silencing, it is more suitable for eliminating low and intermediate frequency noise, but has a poor effect on silencing high frequency noise

Therefore, the use of resistive or resistive mufflers alone cannot achieve the ideal noise reduction effect, resulting in a certain amount of noise pollution to the environment.

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