Three-section metal-granule vibratory exhaust muffler

Abstract

A three-section metal-granule vibratory exhaust muffler comprises an upper end closure and a lower end closure, wherein the upper end closure and the lower end closure are fixed with a casing respectively; the upper end closure is provided with an air outlet; the lower end closure is provided with an air inlet; the air inlet is directly connected with an exhaust port of a pneumatic device; a sleeve and a gasket are arranged inside the casing; an upper protective mesh and a lower protective mesh are fixedly clamped inside the casing; the upper protective mesh and the lower protective mesh divides the casing into three cavity sections; metal granules are put into a middle cavity section between the upper protective mesh and the lower protective mesh, and an airflow upwardly flows through the exhaust muffler to trigger free motion of scattered metal granules in a space between the upper protective mesh and the lower protective mesh, so that on one hand, air gap gas molecules between the granules are excited to convert part of noise frequency spectra into high-frequency or ultrahigh-frequency bands which a human ear cannot hear, and on the other hand, through mutual collision and friction between the metal granules, sound energy can be converted into heat energy to be given off, as a result, the three-section metal-granule vibratory exhaust muffler partially reduces audible sound in the whole noise frequency spectra and achieves a muffling effect; and the three-section metal-granule vibratory exhaust muffler is simple in structure, strong in resistance to oil stains, resistant to air flow impact, economical and practical.

Description

technical field [0001] The invention belongs to the technical field of pneumatic transmission and control, in particular to a three-stage metal particle vibration exhaust muffler. Background technique [0002] With the widespread application of pneumatic transmission and control in the industrial field, the automation level of the corresponding industrial production process has been significantly improved. Pneumatic devices widely exist in industrial practice. Compressed air is used as the power source, and frequent venting and exhaust operations are required. The aerodynamic noise produced by the cylinder or valve exhaust port of the pneumatic device has the characteristics of strong impact, obvious fluctuations, and high frequency spectrum characteristics in the middle and high frequency bands. Its instantaneous peak A sound level can reach more than 130dB (A). It far exceeds the standard below 85dB(A) stipulated by the national standard, and has a serious impact on the e...

AI Technical Summary

Problems solved by technology

Impedance composite muffler has a complex structure, and the sound-absorbing material filled inside is affected by high temperature, oxidation, airflow impact, water vapor impurity penetration, etc., the noise reduction effect is significantly reduced, and it is easy to cause blockage, resulting in poor exhaust, increased back pressure, and reduced The action sensitivity of pneumatic devices will affect the safety of industrial production in serious cases. Therefore, this type of muffler is frequently maintained and has a short service life; although the micro-perforated structure muffler does not use sound-absorbing materials, due to its sound-absorbing mechanism, the micropore diameter is small (usually The requirement is less than 1 mm), the quantity is large, and multi-layer micro-perforated plate composite structure is mostly used, so the volume is large, the structure and process are complicated, and the production cost is high

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