Noise reduction air duct

The utility model discloses a noise reduction air duct. Air duct, a sound absorption sleeve is arranged on the inner wall of the air duct; the sound absorption sleeve is coated on the inner wall of the air duct; a plurality of sound absorption holes are formed in the inner surface of the sound absorption sleeve; a plurality of bulges are also arranged on the inner surface of the sound absorption sleeve; the sound absorption sleeve is made of TPR flexible glue, the protrusions are distributed along the circumference of the inner wall of the sound absorption sleeve, the sound absorption holes are distributed along the circumference of the inner wall of the sound absorption sleeve, the protrusions and the sound absorption holes are distributed in the sound absorption sleeve at intervals in the vertical direction, and the noise reduction air duct is convenient to arrange and good in noise reduction effect. 本实用新型公开了一种降噪风道，包括风道，所述的风道内壁设有吸声套，所述的吸声套包胶在风道内壁上，所述的吸声套内表面设有若干个吸声孔，所述的吸声套内表面还设有若干个凸起，所述的吸声套为TPR软胶，所述的凸起沿吸声套内壁