Low-frequency sound absorption noise reducing device for indoor substation

The utility model relates to a low-frequency sound absorption noise reducing device for indoor substation. The low-frequency sound absorption noise reducing device for indoor substation comprises a low-frequency sound absorption noise reducing plate; the low-frequency sound absorption noise reducing plate is formed by sequentially assembling a low-frequency perforated sound absorption plate, a glass fiber cloth, a high density aluminum silicate sound absorption cotton, a damping plate, a closed cell low-frequency sound absorption foam structure, and a resonance sound absorption plate, from outside to inside; each layer is composed; the low-frequency sound absorption noise reducing plate is integrally assembled with connectors; the low-frequency sound absorption noise reducing plate is assembled on the wall through the connectors; clearances are arranged among the low-frequency sound absorption noise reducing plate, the connectors and the wall; the clearances ensure that reasonable resonant cavities exist between the low-frequency sound absorption noise reducing plate and the wall. Due to the use of the composite structure having different acoustic absorption coefficients and acoustic impedances, the sound absorption band of the structure is wider, specifically the acoustic absorption coefficient of the low frequency below 500Hz is greatly increased; the reverberant sound caused by indoor noise reflection can be greatly reduced by applying the structure into the room of the indoor substation; it is tested on site that the indoor noise is reduced by more than 12dB(A).