Technical principle of ventilation duct silencer

根据对工业用各类风机运行现场噪声源进行实际测试所取得的频谱特性资料来确定在哪些频谱范围内需要多大消声量作为设计吸声体及流体通道的主要依据，同时采用了具有较大吸声材料饰面的狭矩形通道，以增强吸收效果。另，风机的噪声源在噪声级时，其频谱值往往不止一种，而对不同频谱带，对其消声量要求也不相同。

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.

为此风机通风管道消声器及鼓引风机消声器均为阻抗声流型，采用了对高、中频噪声起吸音消声作用的阻式结构及对中、低频噪声起消声降音作用的抗式结构，同时在阻式通道中采用了高频及低频两种吸音消声区，用以限度的增宽消声频带，以实现良好的消声降噪效果。

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.

风机是一种通用机械设备，其使用范围很广，电力、矿山、机械、冶金、化工等各行业的销售均离不开风机。风机在运转中产生的噪声常常成为影响工人健康和干扰环境的祸源。特别是邻近生活区的风机，其进风口和出风口所辐射的空气动力性噪声，更是污染环境的主要因素，形成公害，是近年来我国工业部门治理噪声污染的主要对象之一。

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.

通风管道消声器 用途就是用于通风管道风机降噪。本厂根据对发电厂各类风机运行现场噪声源进行实际测试所取得的濒特性资料来确定在哪些频谱范围内需要多大消声量作为设计吸声片结构及流体通道的主要依据，同时采用了具有较大吸声材料饰面的狭矩形通道，以增强吸收效果。

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.

我们知道，风机的噪声源在噪声级时，其频谱值往往不止一种，而对不同频谱带，对其消声量要求也不相同。为此本产品采用了对高、中频噪声起消声作用的阻式结构及对中、低频噪声起消声作用的抗式结构，同时在阻式通道中采用了高频及低频两种消声区，用以限度的增宽消声频带，以实现良好的消声效果。

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.