Air supply cylinder

The invention discloses an air supply duct which comprises an air duct body, and an air inlet body and an air outlet body are detachably installed at the two ends of the air duct body respectively. The diameter of the two ends of the air duct body is smaller than that of the middle of the air duct body. A motor support frame is arranged in the air duct body; an air inlet grille is arranged on the air inlet body, and the air inlet grille is an arc-shaped umbrella-shaped grille; the air outlet body comprises an eccentric duck tongue structure and an eccentric air outlet grille. The streamline size of the streamline-shaped air duct body conforms to the airflow flowing mechanism, the wind resistance is minimum, and the air flow speed is maximum; energy consumption is low, efficiency is high, and size is small; and the spraying air speed is ensured, and the coverage area and distance of water mist air conveying are increased to the maximum extent. 本发明公开了一种送风筒，包括风筒体，所述风筒体两端分别可拆卸的安装有进风体和出风体；所述风筒体采用流线形风筒体，风筒体两端的直径小于风