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厂家分析如何快速降低工业风机噪音

Manufacturers analyze how to quickly reduce the noise of industrial fans

发布时间:2022-07-28 14:40:15 人气:75 点赞:0

  工业风机噪音来源有哪些

  一般工业风机的噪音在60-90分贝之间!而《城市区域噪声标准》中规定了,工业区噪音大于55分贝的即视为噪音扰民!因此,很多工厂在采购工业风机或安装工业风机时,都要考虑如何来降低工业风机的噪音!今天,我们一起分析一下工业风机噪音的来源有哪些!根据我们生产制造风机的经验,空气动力噪声是工业风机噪声中*强的,其次是机械噪声和电磁噪声。空气动力噪声包括旋转噪声、涡流噪声和共振噪声。分析表明,轴流风机的噪声峰值存在于低频阶段,而中高频阶段则随频率的增加而降低。大气吸收的噪音低于100Hz时,低频噪声的自然衰减非常缓慢。此外,低频噪声波段越长,障碍物绕射能力越强,风声传播距离越远,污染范围越大。

  旋转噪声:又称叶片噪声,是由于叶片旋转周期性打击空气质量点,导致空气压力脉动,其压力尺寸与速度和叶片数量有关。旋转叶片与静止支架等构件之间的相对运动也会引起空气脉动和噪声。如果叶片数与支架数相同,则可能发生同期扰动,使压力波动叠加,噪声增加。为避免这种现象,可采用支架数与叶片数不等或不等节距的方法。

  叶片与固定支架之间的距离也直接影响旋转噪声的声功率,叶片顶部与风管壳体之间的距离。就单片而言,是周期性变化;就多片而言,间距不能一致。因此,在此间隙中,气流脉动是周期性的和不规则的,因此噪声大小与塔的制造质量和叶片安装精度密切相关。

  涡流噪声:又称湍流噪声,是由于叶片旋转时周围气流的边界分离。涡流*容易在叶片背面形成,产生气流呼啸声。为了降低噪音,叶片需要适当的宽度和流线型形状。涡流噪声的频率取决于叶片和气流之间的相对速度。叶轮旋转时,叶片周围的周转速度随轴距而变化,叶根到叶顶气流的相对速度也不断变化,因此涡流噪声明显具有连续频谱的特点。

  共振噪声:由旋转噪声和涡流噪声引起的噪声。在设计中,应注意风管与工业风机外壳的内接缝应平整,避免因粗糙不均匀而引起撕裂声,有时在风管外覆盖阻尼材料。

厂家分析如何快速降低工业风机噪音

  如何降低工业风机噪声?

  阻性消音装置。

  阻性消声装置采用吸声材料消声,吸声材料按一定规律安装在气流管道内,形成阻性消声装置,可有效达到工业风机降噪的目的。适用于消除中高频噪声,多用于消除普通风机设备、燃气轮机等气体流量小的噪声。例如:工业罗茨鼓风机出厂时便会标配消音器!

  抗消音装置。

  抗性消声装置通过控制声抗实现消声,即连接气流管截面积突变的管段或旁接共振腔,改变声阻抗,使某些频率的声波反射、干扰、抵消声阻抗突变截面,达到工业风机降噪的目的。适用于消除空压机、内燃机、汽车排气等高气流条件下产生的中低频噪声。

  阻抗复合消音装置。

  阻抗复合消音装置可简单地认为是前两种消音器的组合。由于阻力和阻力消声装置具有不同的噪声消声频段,经过一定的结构复合后,可以消除高、中、低频噪声。适用于鼓风机、大风洞、试车台等领域的噪声消除,可更好地降低工业风机的噪声。在罗茨鼓风机中,常用的便是隔音房!

  以上便是工业罗茨风机厂家上海瑞柘环保分析的工业风机噪音的来源与降低方法!希望可以帮您解决噪音烦恼!


  What are the sources of industrial fan noise

  Generally, the noise of industrial fans is between 60-90 DB! And the national "urban regional noise standard" stipulates that the noise in industrial areas greater than 55 dB is regarded as noise nuisance! Therefore, many factories should consider how to reduce the noise of industrial fans when purchasing or installing industrial fans! Today, let's analyze the sources of industrial fan noise! According to our experience in manufacturing fans, aerodynamic noise is the strongest among industrial fans, followed by mechanical noise and electromagnetic noise. Aerodynamic noise includes rotating noise, eddy current noise and resonance noise. The analysis shows that the noise peak of axial flow fan exists in the low-frequency stage, while the medium and high-frequency stage decreases with the increase of frequency. When the noise absorbed by the atmosphere is lower than 100Hz, the natural attenuation of low-frequency noise is very slow. In addition, the longer the low-frequency noise band, the stronger the diffraction ability of obstacles, the farther the wind sound propagation distance, and the larger the pollution range.

  Rotating noise: also known as blade noise, it is because the blade rotation periodically hits the air quality point, resulting in air pressure pulsation. Its pressure size is related to the speed and the number of blades. The relative motion between rotating blades and stationary supports will also cause air pulsation and noise. If the number of blades is the same as the number of supports, synchronous disturbance may occur, resulting in superposition of pressure fluctuations and increased noise. In order to avoid this phenomenon, the method of unequal number of supports and blades or unequal pitch can be adopted.

  The distance between the blade and the fixed support also directly affects the sound power of the rotating noise, and the distance between the blade top and the air duct shell. For a single chip, it changes periodically; For multiple pieces, the spacing cannot be completely consistent. Therefore, in this gap, the air flow pulsation is periodic and irregular, so the noise level is closely related to the manufacturing quality of the tower and the installation accuracy of blades.

  Vortex noise: also known as turbulent noise, is due to the boundary separation of the surrounding air flow when the blade rotates. Vortices are most likely to form on the back of the blades, producing a whistling sound of air flow. In order to reduce noise, blades need appropriate width and streamlined shape. The frequency of vortex noise depends on the relative velocity between the blade and the air flow. When the impeller rotates, the turnover speed around the blade changes with the wheelbase, and the relative speed of the air flow from the blade root to the blade top also changes constantly, so the eddy current noise obviously has the characteristics of continuous spectrum.

  Resonance noise: noise caused by rotating noise and eddy current noise. In the design, it should be noted that the inner joint between the air duct and the industrial fan shell should be flat to avoid tearing sound caused by uneven roughness. Sometimes, the air duct is covered with damping materials.

  Manufacturers analyze how to quickly reduce the noise of industrial fans

  How to reduce the noise of industrial fans?

  Resistive silencing device.

  The resistive silencing device adopts sound-absorbing materials for silencing, and the sound-absorbing materials are installed in the air duct according to a certain law to form a resistive silencing device, which can effectively achieve the purpose of noise reduction of industrial fans. It is applicable to the elimination of medium and high frequency noise, and is mostly used to eliminate the noise with small gas flow such as ordinary fan equipment and gas turbine. For example, the industrial roots blower will be equipped with a silencer as standard when it leaves the factory!

  Anti silencing device.

  The resistant silencing device realizes silencing by controlling the acoustic reactance, that is, connecting the pipe section with sudden change in the cross-sectional area of the air duct or connecting the resonant cavity by the side, changing the acoustic impedance, so that the sound waves of some frequencies can reflect, interfere, and counteract the sudden change in the cross-sectional area of the acoustic impedance, so as to achieve the purpose of noise reduction of industrial fans. It is suitable for eliminating the medium and low frequency noise generated under high airflow conditions such as air compressors, internal combustion engines, automobile exhaust, etc.

  Impedance compound silencing device.

  The impedance composite silencing device can be simply considered as the combination of the first two silencers. Because the resistance and resistance silencing devices have different noise silencing frequency bands, high, medium and low-frequency noises can be eliminated after a certain structural compound. It is suitable for noise elimination in blower, gale tunnel, test bench and other fields, and can better reduce the noise of industrial fans. In Roots blower, the commonly used is sound proof room!

  The above is the source and reduction method of industrial fan noise analyzed by Shanghai Ruizhe environmental protection, an industrial Roots fan manufacturer! I hope I can help you solve your noise problems!




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