Exhaust silencer for engineering machinery

Abstract

The invention discloses an exhaust silencer for engineering machinery. The exhaust silencer for the engineering machinery comprises a pipe body, clapboards, an air outlet diffusion pipe, an air inlet diffusion pipe, a short intermediate pipe and a long intermediate pipe, an end cover for sealing the pipe body is arranged at each of two ends of the pipe body, two clapboards are arranged in the pipe body to divide the pipe body into a first cavity, a second cavity and a third cavity, a screen plate parallel to the clapboard is arranged in the second cavity, the long intermediate pipe respectively runs through the two clapboards and the screen plate to communicate the first cavity with the third cavity, the short intermediate pipe respectively runs through the clapboard between the first cavity and the second cavity and the screen plate to communicate the first cavity with the second cavity, sound absorption material is filled between the clapboard between the first cavity and the second cavity and the screen plate, one ends of the air outlet diffusion pipe and air inlet diffusion pipe vertically run through the pipe body, and the other ends are closed by end caps. The exhaust silencer for the engineering machinery enables the whistling of an engine supercharger of the engineering machinery to be well eliminated through high frequency silencing by means of multiple steering and multiple vent holes.

Description

technical field [0001] The invention relates to a muffler, in particular to an exhaust muffler for engineering machinery. Background technique [0002] At present, the existing engine exhaust muffler mainly adopts the resistant exhaust muffler structure of pipe cross-section expansion and cross-section contraction. Due to the change of acoustic reactance at the sudden change of the section of the sound wave, part of the sound wave is reflected back to the sound source without passing through the muffler. The outlet, so as to achieve the purpose of noise reduction. This resistant exhaust muffler has a certain effect on middle and low frequency noise silencing. As for high-frequency noise, because the number of perforated pipe sections and perforated plates that are good for high-frequency noise attenuation is small, and there is no resistive sound-absorbing material that is good for high-frequency noise attenuation, it is not effective for high-frequency noise. The noise re...

AI Technical Summary

Problems solved by technology

For high-frequency noise, because the number of perforated pipe sections and perforated plates that are good at high-frequency noise attenuation is small, and there is no resistive sound-absorbing material that is good at high-frequency noise attenuation, it is not effective for high-frequency noise. The noise reduction effect of frequency noise is not ideal

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