How does the atmosphere furnace maintain the stability of the atmosphere in the furnace?

In order to control the atmosphere in the furnace and maintain the pressure in the furnace, the working space in the furnace must always be isolated from the outside air, and air leakage and air intake should be avoided as much as possible. Therefore, all external connection parts such as furnace shell, masonry structure, furnace door and fan, thermocouple, radiant tube, push-pull feeder, etc. are required to use sealing devices; in order to maintain the highest carbon potential in the furnace, except In addition to controlling the stability of the atmosphere composition, the furnace atmosphere must also be automatically controlled. Therefore, it is necessary to provide various control instruments to continuously and periodically measure and adjust the gas supply in the furnace.

In order to ensure the stability of the atmosphere of the atmosphere furnace, the atmosphere furnace can be divided into two types: muffle furnace and no muffle furnace. The flame of the muffle furnace is outside the muffle furnace, and the workpiece is indirectly heated in the muffle furnace. The flame radiant tube or electric radiant tube separates the flame or electric heating body from the furnace gas to avoid the stability of the atmosphere in the broken ring furnace.

The mixing of reducing gas and air reaches the maximum mixing ratio, and it is easy to cause explosion at the highest temperature. Therefore, the front and rear chambers, quenching chamber and slow cooling chamber of the furnace are equipped with explosion-proof devices. It is also equipped with a furnace gas supply and exhaust control system, which requires explosion-proof measures.

muffle furnace uses reducing gas. In order not to affect the service life of the masonry and not damage the normal furnace atmosphere, the furnace body is required to be made of anti-carbonization refractory materials.

Various atmosphere furnaces have high sealing requirements, and complex loading and unloading operations require a furnace for many purposes. In mass production, they are composed of large-scale joint heat treatment dedicated or dual-purpose units, so a higher degree of mechanization is required. degree of automation.