Abstract: Disclosed is a municipal crossroads structure, wherein a first artery (1) and a second artery (2) form a central platform (3) at an intersection, the first artery (1) is provided with a low tunnel (4) passing underneath the central platform (3), a cross turning tunnel (5) is diverged from the low tunnel (4), and a height of the two types of tunnels enabling vehicles to pass therethrough is no less than 2 meters and no more than 3 meters. The first artery (1) is separated by the low tunnels (4) into two ground surface lanes (7, 8) which are intended for travel in opposite directions and can be used by large vehicles, the two ground surface lanes (7, 8) are connected on the central platform (3) to form U-turn lanes (9, 10), and the U-turn lanes (9, 10) are located on left and right sides of a straight-on lane of the second artery (2) on the central platform (3).

Abstract: A blowing mechanism for a column type electric fan comprises an impeller, a driving motor, a tube-like air ducting assembly, and a swing mechanism. The driving motor is mounted onto a supporting plate attached to the fan's housing. A micromotor of the swing mechanism is fixed onto a connecting disc-like part of the housing. The air ducting assembly comprises an inlet, an outlet, and a flow guiding plate and a flow deflecting plate connected between the top part and the bottom parts of the housing. An upper supporting shaft for the impeller is rotatably attached to the housing through a bearing, and a lower supporting shaft for the impeller is connected to an output shaft of the driving motor. The air ducting assembly is movably carried on the bearing rollers, the disposed on the supporting plate. A link rod of the swing mechanism is movably connected to a rocker extending from the air ducting assembly.

Abstract: A blowing mechanism for a column type electric fan comprises an impeller, a driving motor, a tube-like air ducting assembly, and a swing mechanism. The driving motor is mounted onto a supporting plate which is attached to a housing of the fan. A micromotor of the swing mechanism is fixed onto a connecting disc-like part of the housing. The air ducting assembly at least partly encloses the impeller from outside. The air ducting assembly comprises a top part, a bottom part and a flow guiding plate and a flow deflecting plate connected between the top part and the bottom part, and is provided with an air inlet and an air outlet. An upper supporting shaft for the impeller is rotatably attached to the housing through a bearing, and a lower supporting shaft for the impeller is connected to an output shaft of the driving motor. A guiding lattice is arranged at the air outlet of the air ducting assembly. Bearing rollers are disposed on the supporting plate.