Automatic nitrogen injection device for underground coal mine sealing

The utility model belongs to the technical field of coal mine fire prevention and extinguishing safety, and particularly relates to an automatic nitrogen injection device for underground coal mine sealing. An automatic nitrogen injection device for underground coal mine sealing comprises a sealed goaf, gas inlet equipment, a gas storage tank, a first round pipe, a second round pipe, a gas outlet pipe and a gas release mechanism, the gas inlet equipment is arranged at the top of the sealed goaf, and the gas storage tank is fixedly installed at the top of the sealed goaf; the first round pipe is fixedly installed on the outer wall of one side of the closed goaf, the second round pipe and the air outlet pipe are both fixedly installed on the first round pipe, and the air outlet pipe is located between the closed goaf and the second round pipe. The deflation mechanism is arranged on the first round pipe. The automatic nitrogen injection device for underground sealing of the coal mine has the advantages of being s