Modular blocking, resisting and compensation composite silencer

Abstract

The invention discloses a modular blocking, resisting and compensation composite silencer. The modular blocking, resisting and compensation composite silencer is formed by connecting at least three pipe sections which are the first pipe section for silencing in a blocking mode, the second pipe section for silencing in a resisting mode and the third pipe section for silencing in a resisting mode. A silencing sheet assembly is arranged in the first pipe section and the face, in contact with air flow, of the first pipe section is provided with an aluminum perforated plate; the second pipe section is not equal to the third pipe section in length and comprises an outer panel, an inner mesh plate, a mesh annular frame, a mesh annular frame support and a mesh annular frame covering board, an expansion cavity is formed by the mesh annular frame and the mesh annular frame support, and a resonating cavity is formed between the outer panel and the mesh annular frame covering board. The aluminum perforated plate is arranged outside the silencing sheet assembly, the inner portion of the silencing sheet assembly is filled with sound absorption materials, and the first pipe section, the second pipe section and the third pipe section are riveted into a whole through rivets via a rubber sheet and a hoop. The modular blocking, resisting and compensation composite silencer is simple in structure, convenient to install and capable of enabling each frequency band to be good in silencing effect through a blocking and resisting type silencing and mutual compensation method.

Description

technical field [0001] The invention relates to the field of mufflers, in particular to a modular impedance and compensating composite muffler. Background technique [0002] The resistive muffler mainly uses the sound-absorbing material in the airflow pipe to absorb sound energy, thereby reducing noise; the resistive muffler has a good muffler effect on the middle and high frequency bands, especially the high frequency band, but is not ideal for low frequency noise. [0003] The resistant muffler reflects part of the sound energy back to the direction of the sound source through the sudden change of the acoustic characteristics in the pipeline to achieve the effect of noise reduction. The resistant muffler has a good noise reduction effect on low-frequency noise, but a poor noise reduction effect on high-frequency noise. [0004] The air noise in the ventilation and air conditioning system mainly includes the noise of the fan and the regenerative noise of the system pipelin...

AI Technical Summary

Problems solved by technology

For air noise with such characteristics in ventilation and air conditioning systems, neither the simple resistive muffler nor the resistive muffler can achieve a good noise reduction effect.

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