What are the differences between box type resistance furnace and well type resistance furnace
Box type resistance furnace and well type resistance furnace have some common characteristics. Most of the internal heating type adopts refractory and thermal insulation materials as furnace lining, and the internal atmosphere is mostly air under atmospheric pressure, but there are also external heating type and well type furnace, working under argon, nitrogen or vacuum conditions, and the service temperature is generally below 1200 ° C. Here is a brief introduction to the difference between the two furnaces:
The shape of the box type resistance furnace is like a rectangular box, which is mainly composed of the furnace body and the control box. The box type resistance furnace generally works in the natural atmosphere, mostly in the internal heating mode, with refractory and thermal insulation materials as the furnace lining. It is used for normalizing, annealing, quenching and other heating purposes. According to the different heating temperature, it is generally divided into three types: high temperature box type resistance furnace when the temperature is higher than 1000 degrees, medium temperature box type resistance furnace when the temperature is between 600 and 1000 degrees, and low temperature box type resistance furnace when the temperature is lower than 600 degrees, so as to meet the demand of non weekly heat treatment temperature.
There are many kinds of well resistance furnaces, which are widely used. They are mainly used in natural or protective atmosphere to heat treat or sinter long metal workpieces (rods and long shafts).
The shaft type resistance furnace is mostly cylindrical, because the furnace body is long, in order to load and operate the workpiece conveniently, the large and medium-sized shaft type resistance furnace is usually installed in the pit, only part of it is exposed on the ground, the furnace shell is made of steel plate, the furnace lining structure is similar to the box type resistance furnace, which is composed of heat insulation and fire resistance layer and heat insulation layer. According to the different working temperature, it can be divided into high temperature, medium temperature and low temperature well resistance furnaces, each of which adopts different lining materials. In order to reduce the volume of some well type resistance furnaces, the furnace body and furnace cover are all water-cooled. This kind of furnace has no refractory layer and insulation layer, and uses metal materials as insulation screen. Its energy consumption is much larger than that of the furnace lining made of insulation materials