Demountable ring-shaped ammonia-feeding pipe equipped on nitriding furnace for making atmosphere homogeneous

Abstract

The present invention is detachable and replaceable ring ammonia feeding pipe assembly for nitriding furnace to promote atmosphere homogenization, and belongs to the field of heat treating technology. The ring ammonia feeding pipe assembly includes ring ammonia feeding pipe and ammonia feeding pipe seat, and the detachable and replaceable ring ammonia feeding pipe is set horizontally below the furnace cover and has 45 deg outwards inclined lower part with small hole. The straight pipe welded to the ring ammonia feeding pipe is connected to the ammonia feeding pipe seat via pressing nut or flange. The present invention has no leakage of furnace gas, convenient detaching and replacing, less deformation, and long service life and can ensure homogeneous atmosphere inside the nitriding furnace and thus stable and high workpiece nitriding quality.

Description

technical field [0001] The invention relates to a device for making the atmosphere uniform in a nitriding furnace, in particular to a device for making the atmosphere uniform by adopting a detachable annular ammonia inlet pipe on the nitriding furnace. It belongs to the technical field of heat treatment. Background technique [0002] Ammonia gas is introduced into the nitriding furnace, and the ammonia decomposes at the nitriding temperature to form a nitriding atmosphere to nitride the surface of the workpiece, thereby obtaining a surface layer with excellent performance. The existing well-type nitriding furnace atmosphere supply, measurement, and control devices, found through literature search, the third edition of "Heat Treatment Handbook" edited by the editorial board of "Heat Treatment Handbook" of the Heat Treatment Branch of the Chinese Mechanical Engineering Society (published in June 2001) The third volume "Heat Treatment Equipment and Auxiliary Materials" P163, i...

AI Technical Summary

Problems solved by technology

After this kind of ammonia inlet pipe is used for a period of time, the part of the ammonia inlet pipe extending into the furnace is easy to be broken and damaged. Generally, its service life is only about 1 / 4 of the service life of the furnace tank.

It is difficult to replace and weld it again, which will affect the normal use of the nitriding furnace

On the other hand, the shape of the existing ammonia inlet pipe and the arrangement in the furnace tank have disadvantages that it is difficult to achieve a uniform distribution of the furnace gas in the nitriding furnace, resulting in inconsistencies in the infiltration layer and performance of the entire furnace workpiece

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