Threshold-free double-leaf flood-proof protective air-tight door for clean ventilating duct in urban underground space

A threshold-free double-leaf flood-proof protective air-tight door for a clean ventilating duct in an urban underground space comprises a door frame and door leaves, and the door leaves are arranged on the door frame through a liftable door spindle system; the locking system is used for locking the door leaf on the door frame; the anti-explosion-wave valve system comprises an anti-explosion-wave valve assembly used for being installed on the ventilation opening and a small electric protective airtight door arranged on the door leaf and used for closing the ventilation opening; provided is a small flood gate system. Aiming at an underground traffic tunnel and considering the fortification requirement of civil air defense engineering, novel protection equipment research and design are carried out according to the opening size characteristics, gradient requirements and functional requirements of an existing building, and at least the following beneficial effects are achieved: the door leaf can be lifted, so that