Air port device

The utility model discloses an air port device. The air port device comprises a grid, a regulating sliding trough and a frame, wherein the regulating sliding trough is fixed on the grid and is in parallel with the length direction of the grid; the frame is located on the wide edges of two sides of the grid, is connected to the regulating sliding trough and can move on the regulating sliding trough in the length direction of the grid. In the air port device, the gaps L1 between the frame and the wide edges of the grid are regulated due to the fact that the frame moves in the regulating sliding trough in the length direction of the grid, the whole length of the air port device is changed, and therefore uniformity of the gap L2 between the air port device and a dividing wall is controlled after the air port device is arranged. The air port device has the length adjustable function, and therefore it is avoided that ruling and size cutting are conducted after the air port device is arranged in an existing train as