Automatic exhaust device of pit type gas nitriding furnace

The utility model discloses an automatic exhaust device of a pit type gas nitriding furnace, which belongs to the field of gas nitriding equipment and comprises a vertical gas inlet pipe arranged on a wellhead cover of the nitriding furnace. An elbow is arranged at the upper end of the vertical air inlet pipe, a transverse inclined air inlet pipe is arranged at the other end of the elbow, and the transverse inclined air inlet pipe is arranged obliquely downwards in the exhaust direction; a water storage tank is connected to the lower portion of the air outlet end of the transverse inclined air inlet pipe, a water outlet is formed in the bottom of the water storage tank, a vertical spiral coil pipe is connected to the upper portion of the air outlet end of the transverse inclined air inlet pipe, an air outlet in the top of the vertical spiral coil pipe is connected with a main exhaust pipeline, and a proportioning valve is arranged on the main exhaust pipeline. By means of the structure, functionality of a tra