Method and device for inhibiting suction penetration phenomenon of smoke exhaust valve during key smoke exhaust of tunnel

The invention discloses a method and a device for inhibiting a suction penetration phenomenon of a smoke exhaust valve during key smoke exhaust of a tunnel. The device comprises a tunnel main body, an independent smoke exhaust flue, a normally closed electric smoke exhaust valve and an intelligent control system. A tunnel with key smoke exhaust is intelligently monitored, a reasonable smoke exhaust valve and fan opening strategy is formulated, a traditional smoke exhaust valve is transformed into a normally-closed electric smoke exhaust valve with allowance in a concentric-square-shaped opening mode, and a multi-gear switch is arranged to control the effective smoke exhaust area of each smoke exhaust valve. By determining the fire occurrence position and the wind speed and temperature sensor below the smoke exhaust port, the suction penetration is judged, so that the opening rate of the smoke exhaust valves at different positions is changed, suction penetration of the smoke exhaust port of the key smoke exhau