What factors determine the outer diameter of the resistance wire coil in the electric heating tube?

First, the uneven rate of resistance decline

The resistance wire is contacted with MgO powder. The porosity of MgO is reduced by compression processing after being filled with MgO powder, and the resistance of resistance wire is reduced by 15 ~ 25%. The influence of the outer diameter of the coil should be paid attention to in the resistance drop rate at this time. In general, the outer diameter of the coil will not be uniform, and the resistance will also decrease. This kind of non-uniform power is directly reduced because of the uneven power.

Insulation distance and insulation resistance

The insulation resistance between the resistance wire and the bushing at high temperature is different from that at low temperature, but if the insulation distance is considered from the insulation resistance itself, the greater the distance, the greater the insulation resistance between the resistance wire and the bushing. From the point of view of heat conduction, there is a certain limit. The insulation distance varies with the temperature of insulation resistance required. However, if high quality magnesia powder is used as insulation, 1.5 ~ 3 mm can be selected appropriately

3、 Heat conduction

The heat of the resistance wire is transferred to the casing through magnesia powder, and then to the object to be heated. Generally, a coil of resistance wire is regarded as a resistance wire with an outer diameter of D. when the coil is wrapped with insulating material of thermal conductivity, the thermal divergence will be good when the coil is wrapped with insulating material of thermal conductivity.

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