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Technical principle of ventilation duct silencer

根據各種工業風機運行現場噪聲源的實際測試得到的頻譜特性數據，確定所需的消噪量，其中頻譜范圍是設計吸聲器和流體通道的主要依據。同時，采用帶有較大吸聲材料光潔度的窄矩形通道來增強吸聲效果。另外，風機噪聲源在大噪聲級時，往往有一個以上的頻譜值，不同的頻譜波段對噪聲的要求也不同。

According to the spectrum characteristic data obtained from the actual test of noise sources in the operation site of various industrial fans, the required noise elimination amount is determined, in which the spectrum range is 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 used to enhance the sound-absorbing effect. In addition, when the fan noise source has a large noise level, it often has more than one spectrum value, and different spectrum bands have different requirements for noise.

因此，風機通風管道消聲器和鼓式引風機消聲器均為阻抗聲流型。采用了對高、中頻噪聲具有吸聲降噪作用的阻性結構和對中、低頻噪聲具有吸聲降噪作用的抗阻結構。同時，在阻性通道中采用高頻和低頻吸聲消聲區，使消聲頻帶變大，達到良好的降噪效果。

Therefore, the muffler of fan ventilation duct and the muffler of drum induced draft fan are impedance sound flow type. The resistive structure with sound absorption and noise reduction for high and medium frequency noise and the anti resistive structure with sound absorption and noise reduction for 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 increase the silencing frequency band and achieve good noise reduction effect.

通風管道消聲器的應用及產品特點

Application and product characteristics of ventilation pipe muffler

風機是一種通用的機械設備，具有廣泛的應用。電力、礦山、機械、冶金、化工等行業的銷售都離不開風機。風機運行時產生的噪聲往往成為影響工人健康和擾亂環境的災難源。特別是生活區附近的風機進、出口輻射的氣動噪聲是污染環境的主要因素，形成公害。它是近年來我國工業部門噪聲污染治理的主要目標之一。

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 fans. The noise generated by fan operation often becomes a disaster source affecting workers' health and disturbing the environment. In particular, the aerodynamic noise radiated by the inlet and outlet of fans near the living area is the main factor polluting the environment and forms a public hazard. It is one of the main objectives of noise pollution control in China's industrial sector in recent years.

通風管道消聲器的目的是為了降低通風管道風機的噪聲。根據不久的特點從實際測試獲得的數據操作的各種噪聲源的球迷在發電廠,工廠需要數量決定了噪聲光譜范圍為主要依據的吸音表的設計結構和流體通道。同時，采用帶有較大吸聲材料光潔度的窄矩形通道，增強吸聲效果。我們知道，當風機噪聲源處于大噪聲級時，往往有多個頻譜值，不同的頻譜波段對噪聲的要求是不同的。因此，該產品采用了起降噪中高頻率噪聲作用的電阻結構和起降噪中低頻率噪聲作用的反結構。同時在阻性信道中采用高頻和低頻兩種消聲區，使消聲頻帶變大，達到良好的消聲效果。

The purpose of ventilation duct silencer is to reduce the noise of ventilation duct fan. According to the characteristics of the near future, the number of fans of various noise sources operating from the data obtained from the actual test in the power plant determines the design structure and fluid channel of the sound absorption meter based on the noise spectrum range. At the same time, a narrow rectangular channel with large sound-absorbing material finish is adopted to enhance the sound-absorbing effect. We know that when the fan noise source is at a large noise level, there are often multiple spectrum values, and different spectrum bands have different requirements for noise. Therefore, the product adopts the resistance structure of high-frequency noise in takeoff and landing noise and the anti structure of low-frequency noise in takeoff and landing noise. At the same time, high-frequency and low-frequency silencing areas are adopted in the resistive channel to enlarge the silencing frequency band and achieve good silencing effect.

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