Reverse separation device for outburst prevention air door and air duct of mine

The utility model discloses a reverse partition device for a mine outburst prevention air door air duct, which comprises an air duct, necking grooves are respectively arranged on the circumferential walls of two ends of the air duct in the circumferential direction, a circular baffle is hinged to the middle of the air duct through a pin shaft, and the distance between the outer diameter of the circular baffle and the inner diameter of the air duct is 15mm. The air duct anti-reflux device is used in cooperation with the air duct and the outburst prevention air door, when the air duct passes through the outburst prevention air door, the air duct anti-reflux device is installed in an outburst prevention air door wall, the air ducts are installed on the two sides of the air duct anti-reflux device, a passage is formed through positive pressure, and when the positive pressure stops, the passage is closed under the action of the self weight of the valve disc. 本实用新型公开了一种矿井防突风门风筒逆向隔断装置，包括风筒，风筒两端环向周壁上分别设置着一个缩颈凹槽，风筒中部通