Technical principle of ventilation duct silencer

根據對工業用各類風機運行現場噪聲源進行實際測試所取得的頻譜特性資料來確定在哪些頻譜范圍內需要多大消聲量作為設計吸聲體及流體通道的主要依據，同時采用了具有較大吸聲材料飾面的狹矩形通道，以增強吸收效果。另，風機的噪聲源在噪聲級時，其頻譜值往往不止一種，而對不同頻譜帶，對其消聲量要求也不相同。

According to the spectrum characteristic data obtained from the actual test of the noise sources on the operation site of various industrial fans, determine the amount of noise elimination required in which spectrum range as the main basis for the design of sound absorber and fluid channel. At the same time, a narrow rectangular channel with large sound-absorbing material finish is adopted to enhance the absorption effect. In addition, when the noise source of the fan is at the maximum noise level, there are often more than one spectrum value, and the requirements for noise elimination are also different for different spectrum bands.

為此風機通風管道消聲器及鼓引風機消聲器均為阻抗聲流型，采用了對高、中頻噪聲起吸音消聲作用的阻式結構及對中、低頻噪聲起消聲降音作用的抗式結構，同時在阻式通道中采用了高頻及低頻兩種吸音消聲區，用以限度的增寬消聲頻帶，以實現良好的消聲降噪效果。

Therefore, the muffler of fan ventilation duct and the muffler of drum induced draft fan are of impedance sound flow type. The resistive structure with sound absorption and silencing effect on high and medium frequency noise and the anti structure with sound absorption and silencing effect on medium and low frequency noise are adopted. At the same time, high-frequency and low-frequency sound absorption and silencing areas are adopted in the resistive channel to maximize the silencing frequency band, To achieve good noise reduction effect.

風機是一種通用機械設備，其使用范圍很廣，電力、礦山、機械、冶金、化工等各行業的銷售均離不開風機。風機在運轉中產生的噪聲常常成為影響工人健康和干擾環境的禍源。特別是鄰近生活區的風機，其進風口和出風口所輻射的空氣動力性噪聲，更是污染環境的主要因素，形成公害，是近年來我國工業部門治理噪聲污染的主要對象之一。

Fan is a kind of general mechanical equipment, which has a wide range of applications. The sales of electric power, mining, machinery, metallurgy, chemical industry and other industries are inseparable from fan. The noise produced by fans in operation often becomes a disaster source affecting workers' health and disturbing the environment. In particular, the aerodynamic noise radiated by the air inlet and outlet of the fan adjacent to the living area is the main factor polluting the environment and forms a public hazard. It is one of the main objects of noise pollution control by China's industrial departments in recent years.

通風管道消聲器 用途就是用于通風管道風機降噪。本廠根據對發電廠各類風機運行現場噪聲源進行實際測試所取得的瀕特性資料來確定在哪些頻譜范圍內需要多大消聲量作為設計吸聲片結構及流體通道的主要依據，同時采用了具有較大吸聲材料飾面的狹矩形通道，以增強吸收效果。

The purpose of ventilation duct muffler is to reduce noise of ventilation duct fan. According to the near characteristic data obtained from the actual test of the noise sources on the operation site of various fans in the power plant, the factory determines what noise elimination amount is required in which spectrum range as the main basis for the design of sound-absorbing sheet structure and fluid channel. At the same time, the narrow rectangular channel with large sound-absorbing material finish is adopted to enhance the absorption effect.

我們知道，風機的噪聲源在噪聲級時，其頻譜值往往不止一種，而對不同頻譜帶，對其消聲量要求也不相同。為此本產品采用了對高、中頻噪聲起消聲作用的阻式結構及對中、低頻噪聲起消聲作用的抗式結構，同時在阻式通道中采用了高頻及低頻兩種消聲區，用以限度的增寬消聲頻帶，以實現良好的消聲效果。

We know that when the noise source of the fan is at the maximum noise level, there are often more than one spectrum value, and the requirements for noise elimination are different for different spectrum bands. Therefore, the product adopts the resistive structure that plays the role of silencing high and medium frequency noise and the anti structure that plays the role of silencing medium and low frequency noise. At the same time, two kinds of silencing areas of high frequency and low frequency are adopted in the resistive channel to maximize the silencing frequency band and achieve good silencing effect.