Technical principle of ventilation duct silencer
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.
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.
Application and product characteristics of ventilation pipe muffler
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.
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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