Jet ejector for automatic dilution of upper corner gas

Abstract

The invention provides a novel jet-flow ejector capable of automatically diluting upper corner gas and belongs to the field of coal mine safety. The advancing mode of an underground coal mine working face generally is a U-shaped draw-back mode, a ventilation mode adopts an ascensional ventilation mode, and the ascensional ventilation mode has a shortcoming that the upper corner gas is easy to accumulate. The solution scheme is to employ a jet-flow ejector which is low in cost, good in effect and capable of diluting the gas. The jet-flow ejector is connected with an underground pressure ventilation pipe through a sensor switch; when a sensor detects that the upper corner gas is over limit, the sensor switch is turned on and air is supplied to the jet-flow ejector through the pressure ventilation pipe; when the air is supplied, the internal pressure of the jet-flow ejector is reduced, and therefore, the gas can be absorbed into the jet-flow ejector, then discharged into a roadway by the jet-flow ejector, and finally discharged to the outside along with an airflow in the roadway. When the concentration of the gas is reduced to a certain value, the sensor switch is turned off, and the pressure ventilation pipe stops supplying air to the jet-flow ejector. The jet-flow ejector is simple, novel and unique in structure, convenient to use and operate, is a great innovation for preventing the gas over limit, and is remarkable in economic effects.

Description

technical field [0001] The invention relates to a novel jet ejector for diluting the upper corner gas on the working face, which is a jet ejector for automatically diluting the upper corner gas. Background technique [0002] At present, the propulsion method of the underground working face of coal mines usually adopts a U-shaped retreat type. Since the gas density is lower than that of air, it will flow to high places underground, and upward ventilation is conducive to gas discharge. One disadvantage of upward ventilation is that gas is easy to accumulate in the upper corner. If it is not treated in time, there will be a danger of gas explosion when the concentration reaches a certain level, which will seriously threaten the safe production of the mine; if the compressed air pipe is used to supply air to directly flush the gas in the upper corner, local air flow disturbance will easily occur. There is an urgent need for a jet ejector with low cost and good effect, which can...

AI Technical Summary

Problems solved by technology

The disadvantage of upward ventilation is that gas is easy to accumulate in the upper corner

If it is not treated in time, there will be a danger of gas explosion when the concentration reaches a certain level, which will seriously threaten the safe production of the mine; if the compressed air pipe is used to supply air to directly flush the gas in the upper corner, local air flow disturbance will easily occur

Images