Outer flange structure of air flue of railway vehicle

The invention relates to an outer flange structure of an air flue of a railway vehicle. The outer flange structure comprises an outer flange barrel and an outer flange edge, wherein the outer flange barrel is defined by four wing plates, the bottom ends of the left wing plate and the right wing plate of the outer flange barrel are aligned at the bottom end of the outer flange edge, and the left wing plate and the right wing plate of the outer flange barrel and the outer flange edge are jointly located on a vehicle flat roof plate; and the four wing plates of the outer flange barrel and a top plate of the middle end of the vehicle are fixedly welded. According to the outer flange structure of the air flue of the railway vehicle, innovation is made on the basis of a conventional structure; the brand-new design structure and the brand-new welding process are adopted, the caliber of the outer flange barrel of the air flue is enlarged, and the wing plates on the two sides and the lowermost edge of the outer flange edge extend to the flat roof plate. When a roof is positively installed, an outer flange of the air flue is directly located on the flat roof, the wing plates of the outer flange barrel of the air flue and the lowermost edge of the flange are directly welded to the flat roof plate, the lateral faces of the wing plates of the outer flange of the air flue and the top plate at the middle end are welded, and therefore the outer flange structure of the air flue can meet the installation requirement of an outer air flue of an air-conditioner and the requirement for the sealing performance of a vehicle body steel structure at the same time; and in addition, the structure is simple, and the process is easy to implement.