Three-way air cylinder with arc-shaped air door capable of being automatically and axially opened

The utility model relates to the technical field of three-way air ducts, and discloses a three-way air duct with an arc-shaped air door capable of being automatically and axially opened, which comprises an air duct body, a door frame is fixedly arranged on the wall body of the upper end of the air duct body, a through groove is formed in the door frame, and a first door plate is connected to the left end of the upper part of the door frame in a sliding manner; the right end of the upper portion of the door frame is slidably connected with a second door plate. According to the three-way air duct with the arc-shaped air door capable of being automatically opened in the axial direction, the air duct body can be connected with a designated connecting body through the fixing ring, then the air duct is fixedly installed through the fixing holes, and the whole mechanism is installed on the outer side of the air duct body, so that the effects that maintenance is convenient, operation of an air distribution fan is not