Goaf water seal precipitation discharge closed system for working face industrial wastewater

The invention discloses a goaf water seal precipitation discharge closed system for working face industrial wastewater. The goaf water seal precipitation discharge closed system is characterized in that a # closed structure is arranged in a second working face haulage gate and located outside one side of a mining stopping line and at the joint with a third working face air return connection roadway; a 2# closed structure is arranged at one end of a second working face connection roadway and is close to the joint with a second working face air return roadway; a 3# closed structure is arranged at the other end of the second working face connection roadway and is close to the joint with a second working face air return way; and a 4# closed structure is arranged at the end, away from the 3# closed structure, of the second working face air return way and located at the joint with a first working face haulage gate. The closed structures define a discharge water channel between a third working face return water sump