专注通风管道加工·排烟罩

1、 Resistance muffler

电阻式消声器利用吸声材料的吸声功能来噪声。其结构是将吸声材料固定在有空气流动的管道内壁上，或以一定的方式布置在管道或壳体内，形成一个阻性消声器。吸声材料能部分吸收入射到其上的声能。声能被吸收的原因是吸声材料的多孔性和疏松性。当声波进入孔隙时，孔隙中的空气和物质由于摩擦和粘滞阻力产生微小振动。相当一部分声能被转换成热能并被吸收。

The resistance muffler uses the sound absorption function of sound absorbing materials to eliminate noise. Its structure is to fix the sound absorbing material on the inner wall of the pipe with air flow, or arrange it in the pipe or shell in a certain way to form a resistive muffler. The sound absorbing material can partially absorb the sound energy incident on it. The reason why sound energy is absorbed is the porosity and porosity of sound absorbing materials. When the sound wave enters the pore, the air and material in the pore will produce tiny vibration due to friction and viscous resistance. A considerable part of sound energy is converted into heat energy and absorbed.

它对高频和中频噪声的降噪效果较好，但对低频噪声的降噪效果较差。

It has good noise reduction effect on high-frequency and intermediate frequency noise, but poor noise reduction effect on low-frequency noise.

1. 管式消声器

1. Pipe muffler

管式消声器是简单的消声器。它只在管壁内缘粘贴一层吸声材料，所以又称“管衬”。其特点是制造方便，阻力小，但只适用于小风管，直径一般不超过400mm。管式消声器仅对中高频吸声有一定的消声效果。低频率下性能差。

The tubular muffler is a simple muffler. It only sticks a layer of sound absorbing material on the inner edge of the pipe wall, so it is also called "pipe lining". It is characterized by convenient manufacturing and small resistance, but it is only applicable to small air ducts, and the diameter generally does not exceed 400mm. The tubular muffler has a certain sound attenuation effect only for medium and high frequency sound absorption. Poor performance at low frequencies.

2. 板和格式消声器

2. Plate and format muffler

管式消声器低频性能差，易通过中、高速率噪声。此外，当管道截面面积较大时，会影响高频噪声的消声效果。这是因为高频声波(短波长)在管道中以窄束传播。管面积大时,声波之间的联系和管壁上的吸声材料降低,这样沉默的高频声音降低,因此,空气管的很大部分,部分可分为几个网格,芯片和格式消音器。片状消声器应用广泛，结构简单。格式消声器的有效截面积不得小于风管的截面积，因此体积较大，每个格网的尺寸应控制在200mm × 200mm左右。板式消声器的板间间距一般在100 ~ 200mm范围内。当板间距加大时，消声量相应减小。

The tubular muffler has poor low frequency performance and is easy to pass through medium and high speed noise. In addition, when the pipe section area is large, it will affect the noise reduction effect of high-frequency noise. This is because high-frequency sound waves (short wavelengths) travel in narrow beams in the pipe. When the pipe area is large, the connection between sound waves and the sound absorbing material on the pipe wall will be reduced, so the silent high-frequency sound will be reduced. Therefore, a large part of the air pipe can be divided into several grids, chips and format silencers. The sheet muffler is widely used and simple in structure. The effective sectional area of the format muffler shall not be less than the sectional area of the air duct, so the volume is large, and the size of each grid shall be controlled within 200mm ×  About 200mm. The spacing between plates of plate muffler is generally 100~200mm. When the plate spacing increases, the noise reduction amount decreases accordingly.

二、共振消声器

2、 Resonant muffler

吸声材料对低频噪声的吸收能力通常很低。仅仅通过增加吸声材料的厚度来提高吸声效果是不经济的。为了提高低频噪声的吸声效果，通常采用谐振式消声器。谐振消声器的形式是，所述管口与所述谐振腔连接，所述小孔处的气柱与所述腔内的空气形成弹性谐振系统。当外界噪声频率与共振系统固有频率相同时，小孔内的气柱发生共振，与孔壁剧烈摩擦，可消耗声能，从而达到消声的目的

The absorption capacity of sound absorbing materials to low-frequency noise is usually very low. It is not economical to improve the sound absorption effect only by increasing the thickness of the sound absorption material. In order to improve the sound absorption effect of low-frequency noise, resonant muffler is usually used. The resonant muffler is in the form that the nozzle is connected with the resonant cavity, and the air column at the small hole forms an elastic resonant system with the air in the cavity. When the frequency of the external noise is the same as the natural frequency of the resonance system, the air column in the hole will resonate and rub violently with the hole wall, which can consume sound energy, so as to achieve the purpose of noise elimination