Paralleling varied deep secondary back cavity micro-perforated pipe silencer

Abstract

The invention provides a paralleling varied deep secondary back cavity micro-perforated pipe silencer. The paralleling varied deep secondary back cavity micro-perforated pipe silencer comprises a micro-perforated pipe, an outer barrel, a front partition plate, a rear partition plate and a sleeve. The micro-perforated pipe and the outer barrel are coaxially arranged in a sleeved mode. Through micropores are formed in the pipe wall of the micro-perforated pipe evenly. The center lines of the through micropores are perpendicular to the center axis of the micro-perforated pipe. The air inlet end and the exhaust end of the micro-perforated pipe are connected with the two ends of the outer barrel in a sealed mode through a front end cover and area end cover. The front partition plate and the rear partition plate are arranged on the micro-perforated pipe in a sleeving mode. The outer edge of the front partition plate and the outer edge of the rear partition plate are connected with the innerwall of the outer barrel so that a front cavity, a middle cavity and a rear cavity can be formed. The sleeve is arranged on the micro-perforated pipe in a sleeving mode. The front end and the rear endof the sleeve are connected with the end face of the front partition plate and the end face of the rear partition plate correspondingly, and the middle cavity is divided into an upper cavity and a lower cavity. The silencer can achieve the good silencing effect in the whole frequency spectrum range, especially in the middle-high frequency range.

Description

technical field [0001] The invention belongs to the technical field of the micro-perforated pipe muffler in the air flow channel of the aerodynamic equipment or the intake and exhaust system, and in particular relates to a parallel micro-perforated pipe muffler with unequal depth sub-back chambers. Background technique [0002] The sound-absorbing structure of micro-perforated panels was proposed by Academician Ma Dayou in the 1970s. Since the pore size is less than 1mm, good sound-absorbing effects can be obtained without adding porous sound-absorbing materials. It was later extended to the engineering application of micro-perforated pipe mufflers. The micro-perforated pipe muffler has the advantages of high temperature resistance, oil resistance, corrosion resistance, simple structure, and easy processing, and can be used in high-speed airflow and humid harsh environments, so it has been widely used in construction and industrial noise reduction. However, in industrial pi...

AI Technical Summary

Problems solved by technology

However, in the industrial pipe muffler, the traditional micro-perforated pipe muffler only has a good muffler effect on the noise of a certain frequency band, but has a poor muffler effect on other frequency bands.

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