External disaster protection device for tubular passive-driven air cooling system

The invention provides an external disaster protection device for a tubular passive-driven air cooling system. The device comprises an inlet protection device and an outlet protection device. The outlet protection device is installed at the top end of a pipeline outlet and comprises two inner concave guide plates, two linkage rotation fans and a related connecting and fixing structure. An outlet structure is similar to an airflow shrinkage device, the velocity of air flowing through the upper fan increases in the device to push the fan to rotate, the lower fan is driven by the upper fan to produce a suction effect on the flowing of air in an outlet, and the pressure of air in the outlet is reduced. The inlet protection device is installed at the bottom end of a pipeline inlet, and comprises a round disc protruding downwards, a horn-shaped guide plate and a related connecting and fixing mechanism. An inlet structure is similar to an airflow expanding device to increase the pressure of air at an inlet. With the help of the fluid mechanics principle, the difference of the pressures of air in the inlet and the outlet of the passive-driven system is increased, and the heat removal capability of the system is improved.