Pit type nitriding furnace

The utility modelrelates to the field of heat treatment equipment, in particular to a pit type nitriding furnace which comprises a furnace body and a furnace cover arranged at the top end of the furnace body, a muffle tank is arranged in the furnace body, the bottom end of the muffle tank is communicated with an air inlet pipe, a through hole is formed in the furnace cover, a high-pressure fan is arranged in the through hole, and an air outlet of the high-pressure fan faces the furnace body. The method has the effects of improving the uniformity of the nitride layer on the surface of the mold and improving the heat treatment quality of the mold. 本申请涉及热处理用设备的领域，尤其是涉及一种井式氮化炉，其包括炉体和设置在炉体顶端的炉盖，炉体内设有马弗罐，马弗罐的底端连通有进气管，炉盖上开设有通孔，通孔内设有高压风机，高压风机的出风口朝向炉体设置。本申请具有提升模具表面氮化层的均匀度，提升模具热处理质量的效果。