Internally-installed and/or externally-installed rapid-cooling device of heat treatment furnace

The utility model discloses an internally-installed and/or externally-installed rapid-cooling device of a heat treatment furnace. When the internally-installed and/or externally-installed rapid-cooling device is working, air cooled by a cooler is pumped into a entrance pipeline by a draught fan to enter an inner cavity of a furnace pipe, the cooled air takes away the heat in the inner cavity of the furnace pipe and is pumped out through an exit pipeline, is cooled by the cooler, and is pumped into the furnace pipe by the draught fan again, so as to realize the cooling of the inner part of the furnace pipe. The cooled air is blown to the outer surface of the furnace pipe through an air inlet by a cooling draught fan to cool the exterior of the furnace pipe and then the air with the heat of the exterior of the furnace pipe is pumped out of the furnace through an air outlet, so as to realize the cooling of the outer part of the furnace pipe. The internally-installed and/or externally-installed rapid-cooling devi