Centrifugal Fan Air Inlet Noise Control

Project Name: Centrifugal Fan Air Inlet Noise Control

Governance Measures: Turbine Sound Dampener Design noise reduction30db(A)

By installing our company's designed silencer at the air outlet of the centrifugal fan, effectively reducing the noise emitted from the fan outlet.

Centrifugal fan noise control methods:

1. Soundproofing Enclosure Shell Shape Requirements

The acoustic enclosure should resemble the noise-generating equipment, reducing both the volume and cost of the enclosure while also minimizing the radiation area of the noise. The enclosure body should maintain a certain distance from the equipment to ensure normal maintenance, inspection, ventilation, and exhaust requirements. Square parallel walls should be minimized to prevent standing wave effects inside the enclosure, which can lead to a decrease in sound insulation.

2. Soundproofing Enclosure Material Selection

The outer panels of soundproof enclosures are commonly made from materials such as lead, steel, and aluminum, with stainless steel sheets being the most frequently used. The choice of wall material for the centrifugal fan soundproof enclosure is selected accordingly.2-3mm steel plate.

Acoustic enclosure for centrifugal fan with sound-insulating material applied to the surface of the enclosure walls8mm thick damping layer, applied to suppress and prevent resonance and sympathetic vibration in lightweight structures such as steel plate enclosures, reducing sound wave radiation.

Inside, usually used80mm thick porous sound-absorbing material is processed. The glass wool facing layer consists of one layer of glass cloth and one layer of perforated steel plate with a 25% perforation rate. The average transmission loss of the sound-insulating panel is between 34 and 45 dB.

3. Soundproofing罩 installation is required.

Replacing the impact connection between the sound-insulating housing and the machine with a soft connection, typically rubber or felt, absorbs vibrations between them. Otherwise, the machine's vibrations would be directly transmitted to the housing, turning it into a noise radiation surface, thereby reducing the sound-insulating effect. Vibration isolation measures are also required between the machine and the foundation, as well as between the sound-insulating housing and the machine foundation.

The sound-insulating enclosure has a high sound energy density, and even the smallest openings or gaps in the enclosure can emit a significant amount of noise. Studies have shown that as long as there are openings on the total area of the sound-insulating enclosure,0.01 square inch hole size reduces sound insulation by 20-25 dB or more.

Centrifugal fan noise control primarily involves using soundproof enclosures. Customized sound-insulating materials can effectively isolate the noise of the rational fan from multiple angles within the enclosure, preventing the fan noise from affecting the surrounding area. The specific sound-insulating materials and equipment should be determined based on the on-site conditions.