According to the frequency spectrum characteristic data obtained from the actual test of various industrial fan noise sources, the main basis for the design of sound absorber and fluid channel is how much noise is needed in which frequency spectrum range, and the narrow rectangular channel with large sound absorption material is used to enhance the sound absorption effect.

In addition, when the noise source of the fan is at the noise level, there will be more than one spectrum value, and different frequency bands have different requirements for noise reduction. Therefore, the mufflers of the induced draft fan are impedance acoustic flow type, and adopt the resistive structure which can absorb and eliminate the high and medium frequency noise, and the resistive structure which can eliminate and reduce the middle and low frequency noise.

At the same time, the high-frequency and low-frequency sound absorption and silencing areas are used in the resistive channel to widen the noise elimination frequency band and achieve good noise reduction effect.

What industries are safety valve eliminators widely used in? The reason for the rapid development of safety valve muffler production in the market is that we not only win by quality, but also sell and service safety valve muffler by roots blower. As shown in the figure below, the safety valve muffler market is developing rapidly and its potential is immeasurable. According to the change trend of steel price, the price of safety valve muffler will also change.

The basis of rapid development of safety valve silencing: the principle of safety valve muffler is based on jet pressure and exhaust pipe diameter. In order to suppress the noise generated by high-pressure gas flow, the factors such as avoiding high-temperature oxidation of sound-absorbing filler, high-speed water vapor penetrating the sound-absorbing filler, frequent maintenance and poor noise elimination effect should be considered.

According to the comprehensive noise elimination effect, the safety valve muffler adopts the structure of micro hole and multi cavity. It does not use resistant sound-absorbing filler, so it has small resistance loss and is not afraid of oil mist and water vapor. High temperature and high speed airflow impact resistance. The high-pressure airflow enters into each pressure reducing body through multiple flow control in the muffler of the truck. After damping, separation, expansion and decompression, the audio frequency of the original air flow is changed. It is widely used in petroleum, chemical, metallurgy, textile and other industries.

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In general, the steam discharge velocity of the safety valve eliminator is fast and the air flow noise is large, so it needs to expand through the through-hole first. After passing through many through holes, the steam will be depressurized and depressurized in the resistance expansion chamber, and then the air flow will be ejected through the small holes. After that, the noise is reduced to more than 2000 Hz, and some of the noise is further reduced to a higher frequency. We have installed a resistance absorbing motorcycle sound cotton structure outside the expansion chamber, which is based on the pressure reducing body