This utility model relates to the field of heat treatment furnaces, and more particularly to a
nitrogen sealing
protection mechanism for heat treatment furnaces, including a connecting
flange; it also includes a connecting
pipe, support rods, a mounting plate, bearings, a rotating shaft, an
impeller, a
rotation sensor, a mounting base, a controller, and an audible and visual alarm. A connecting
pipe is provided on the front side of the connecting
flange, and one end of four circumferentially distributed support rods is installed on the front position of the inner surface of the connecting
pipe. The other end of the support rods is provided with a mounting plate, and a bearing is installed at the center position of the rear surface of the mounting plate. By setting up an
impeller, when
nitrogen leaks inside the heat treatment furnace, the leaking
nitrogen will blow the
impeller, causing the impeller to drive the rotating shaft to rotate with the cooperation of the bearings. This movement can be detected by the
rotation sensor, which then transmits a
signal to the controller, causing the audible and visual alarm to sound, thereby alerting the staff that nitrogen is leaking inside the heat treatment furnace.