根据安全卫生管理局(OSHA)规定，人耳**可以承受连续8小时85分贝的声音强度，而无负面影响。125分贝的声音，已经会让人感到头痛。在正常状态下，人类能够忍受的声音约为160分贝。一旦听到的声音超过这个数字，有些人的耳膜可能会因此破裂。声音过大会对人的内部器官造成损伤。试验表明, 噪声超过115分贝( 如飞机发动时) 大脑皮层的功能便严重衰退, 达到165分贝时动物死亡, 人类的承受力不能超过175分贝。而罗茨鼓风机如果没有进行消音降噪，其原始噪音一般在100-120分贝之间。这个噪音已经明显危及到了人体健康!为此，小编整理了一下几种罗茨风机降噪方法分享给大家!

　　罗茨风机噪音来源：

　　[1]徐国强. (2014). 探讨如何降低罗茨鼓风机噪音的设计. 城市建设理论研究:电子版.期刊中介绍机械噪声主要来源于机壳的振动，使机壳发生振动的原因主要有两个:

　　①叶轮的转动不平衡力,通过传动构件转移到机壳上,对机壳产生周期性的激励;

　　②机壳内的涡流强度所决定的压力脉动,常与叶片的基频(即叶片通过频率)有联系,也对机壳产生周期性的激励。

　　风机的风压越高,这一激励源越不能忽视。噪声测量测量罗茨风机噪声的目的就是为了对被测对象进行噪声等级的分析、评价或声源识别,以便采取适当的措施进行噪声控制。

　　通常罗茨风机的噪声识别方法有现场测量法、声功率测量法、表面振动测量法等,其中,现场测量法是工程实际中常用的方法。

　　现场测量法通过对数据、频谱的分析确定主要的噪声辐射源,方法简便,测量结果能真实反映风机的振动与噪声水平,但易受环境的影响。声功率测量法反映噪声源辐射强度与辐射特性,避免了声压级易受测量距离和测量环境影响的缺点。

　　振动测量法是根据罗茨风机的表面振动速度来估计表面辐射声功率,主要困难在于罗茨风机零部件辐射比的确定,需要测量较多的数据和进行大量的计算。

罗茨风机降噪设备隔音房

　　阅读完了徐国强. (2014). 探讨如何降低罗茨鼓风机噪音的设计.文章后，我又咨询了一下我们厂的技术研发人员。从而得知，罗茨风机出厂设及参数的精度是罗茨风机噪音来源之一。如果不考虑更换罗茨风机，可以采用以下方式进行罗茨风机降噪!

　　1.加装或更换罗茨风机消音器;

　　2.加装罗茨风机隔音房;

　　3.如果罗茨风机噪音高于120分贝，需要停机及时排查风机是否有叶轮偏磨现象，并及时修复;

　　4.管道乱流噪音，空气在流动时，若碰到尖锐的障碍物，极易发生乱流。此乱流虽然与涡流的情况不同，同样会产生噪音，或频率甚高的啸音，对风机而言亦会造成效率损失。因此，要及时排查管道，必要时加装隔音棉进行降噪!

　　相信大家通过以上方法可以及时处理罗茨风机噪音问题了，如果您在生产环境中遇到了无法解决的问题，也可以联系我们厂定制罗茨风机降噪方案!

　　友情提示：若罗茨风机噪音低于80分贝，属于正常的工业设备噪音范围。想进一步降低风机噪音，请及时加装罗茨风机隔音房哦!

　　How to reduce the noise of Roots blower when it is started up to 80 dB

　　According to the regulations of the safety and Health Administration (OSHA), the human ear can withstand a maximum sound intensity of 85 dB for 8 hours without negative effects. The sound of 125 decibels will already make people feel headache. Under normal conditions, human beings can tolerate about 160 decibels of sound. Once you hear more than this number, some people's eardrums may rupture. Excessive sound will cause damage to people's internal organs. Experiments show that when the noise exceeds 115 dB (e.g. when the aircraft starts), the function of cerebral cortex will decline seriously. When it reaches 165 dB, animals die, and human endurance can not exceed 175 dB. If the roots blower is not silenced, its original noise is generally between 100-120 dB. This noise has obviously endangered human health! To this end, Xiaobian sorted out several noise reduction methods of Roots blower and shared them with you!

　　Noise source of Roots blower:

　　[1] Xu Guoqiang (2014). This paper discusses the design of how to reduce the noise of Roots blower Theoretical research on Urban Construction: electronic version According to the journal, the mechanical noise mainly comes from the vibration of the casing. There are two main reasons for the vibration of the casing:

　　① The rotating unbalanced force of the impeller is transferred to the casing through the transmission member to generate periodic excitation to the casing;

　　② The pressure pulsation determined by the eddy current intensity in the casing is often related to the fundamental frequency of the blade (i.e. blade passing frequency), and also generates periodic excitation to the casing.

　　The higher the wind pressure of the fan, the more this excitation source can not be ignored. Noise measurement the purpose of measuring the noise of Roots blower is to analyze and evaluate the noise level of the measured object or identify the sound source, so as to take appropriate measures to control the noise.

　　Generally, the noise identification methods of Roots blower include on-site measurement method, sound power measurement method, surface vibration measurement method, etc. among them, on-site measurement method is a common method in engineering practice.

　　The on-site measurement method determines the main noise radiation source through the analysis of data and spectrum. The method is simple, and the measurement results can truly reflect the vibration and noise level of the fan, but it is easy to be affected by the environment. The sound power measurement method reflects the radiation intensity and radiation characteristics of noise source, and avoids the disadvantage that the sound pressure level is easily affected by the measurement distance and measurement environment.

　　The vibration measurement method estimates the surface radiated sound power according to the surface vibration speed of Roots blower. The main difficulty lies in the determination of the radiation ratio of Roots blower parts, which requires more data measurement and a lot of calculation.

　　After reading Xu Guoqiang (2014). This paper discusses the design of how to reduce the noise of Roots blower After the article, I consulted the technical R & D personnel of our factory. Therefore, the factory setting and parameter accuracy of Roots blower is one of the noise sources of Roots blower. If the replacement of Roots blower is not considered, the following methods can be adopted to reduce the noise of Roots blower!

　　1. Install or replace roots blower silencer;

　　2. Install roots blower sound insulation room;

　　3. If the noise of Roots blower is higher than 120 dB, it is necessary to shut down the blower, check whether there is eccentric wear of impeller in time, and repair it in time;

　　4. Pipe turbulence noise. When air flows, it is very easy to have turbulence if it encounters sharp obstacles. Although this turbulence is different from the vortex, it will also produce noise or high-frequency whistling, which will also cause efficiency loss to the fan. Therefore, it is necessary to check the pipeline in time and install sound insulation cotton for noise reduction if necessary!

　　I believe you can deal with the noise problem of Roots blower in time through the above methods. If you encounter problems that cannot be solved in the production environment, you can also contact our factory to customize the noise reduction scheme of Roots blower!

　　Friendly tip: if the noise of Roots blower is lower than 80 dB, it belongs to the normal noise range of industrial equipment. If you want to further reduce the fan noise, please install Roots fan sound insulation room in time!

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