A noise reduction type fan case device

Abstract

The utility model relates to a ventilation equipment technical field especially a noise reduction type fan box device. The device includes the fan cabinet and sets up in its fan assembly, the inner wall of fan cabinet is attached with composite sound absorption cotton board to constitute primary sound absorption structure, the air outlet of fan assembly is connected with sound absorption assembly through hose joint, the sound absorption assembly includes the sound absorber and several character shape flow channel sound absorption box connected in proper order, constitutes secondary sound absorption and tertiary sound absorption structure. The utility model through in the inner wall, air outlet and export flow channel carry out multistage, compound type sound absorption and damping design, effectively widened the noise reduction frequency band, especially significantly reduced low frequency noise, guaranteed good ventilation performance simultaneously, compact structure, maintenance is convenient, effectively solved the problem that the frequency band is limited, the volume is heavy and the durability is poor in the existing fan box noise reduction technology.

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