Sound Enclosure is an effective noise reduction measure that encloses noisy equipment, effectively blocking the transmission and diffusion of noise to reduce its impact on the environment.

I. Application Scope

● Machine and equipment sound enclosures

● Air compressor, fan, and water pump sound enclosures

● Online inspection sound enclosures

● Outdoor air conditioning unit sound enclosures

● Workshop offices and operation rooms

II. Sound Insulation Principle

The outer shell of the sound enclosure is made of a layer of airtight, heavy, and rigid metal material, typically 2–3 mm thick steel plate, covered with a damping layer. The damping layer is often made of fiber fabric or fiber material impregnated with damping glue (such as asphalt-impregnated burlap, fiberglass cloth, felt, or asbestos wool), and sometimes specially formulated damping paste is used.

The damping layer is added to the outer shell to avoid the coincidence effect and low-frequency resonance of the plate. The shell can also be made of wood or plastic boards, while lightweight sound insulation structures may use aluminum plates. High-performance sound enclosures can be constructed as double-layer shells, with the inner layer being thinner than the outer layer; the spacing between the two layers is typically 6–10 cm, filled with porous sound-absorbing material. The inner side of the enclosure is lined with sound-absorbing material to absorb sound and reduce noise within the cavity. This sound-absorbing layer is covered with a perforated protective panel, with perforations accounting for about 20–30% of the panel area.

Between the enclosure and the machine, as well as between the enclosure and the foundation, rubber padding is usually installed to prevent vibration transmission. Openable access doors and observation windows must be well sealed. For equipment that requires heat dissipation, necessary ventilation ducts should be included in the sound enclosure. These ducts must have sound-absorbing structures or be equipped with silencers. When designing a sound enclosure, it is important to meet process and maintenance requirements, and sometimes measures must be taken to prevent oil contamination, dust, and corrosion.