Compound ventilation duct riveted structure of a rail transit car air conditioner

The utility model discloses a compound ventilation duct riveted structure of a rail transit car air conditioner, including four I, two bottom plates of angle aluminium alloy, two II and three curb plates of angle aluminium alloy, two bottom plates become a cross -section with the both sides hoarding and are square tubular structure, and four angles of tubular structure are by four angle aluminium alloies I and rivet rigid coupling, one corner aluminium alloy II is installed respectively at the middle part of the face that two bottom plates are relative, and aluminium alloy II cross -sections in angle are " pi " shape, two aluminium alloies II form a slot, and another curb plate cartridge is in this slot, three curb plate parallels. The utility model discloses a compound ventilation duct of a rail transit car air conditioner is assembled into with II two kinds of angle aluminium alloies of angle aluminium alloy with bottom plate and curb plate to angle aluminium alloy I, has reduced the kind of curb plate and