Como o diâmetro e a uniformidade transversal do fio de resistência afetam a vida útil do serviço do aquecedor elétrico de borracha de silicone?

A influência do diâmetro e da uniformidade da área transversal do fio de resistência na vida útil do aquecedor elétrico de borracha de silicone é refletida principalmente nos seguintes aspectos:
Causing local overheating: The uneven diameter or cross-sectional area of ​​​​the resistance wire will cause differences in the resistance values ​​​​of different parts of the resistance wire. According to Joule's law \\(Q=I^{2}Rt\\) (where Q is heat, I is current, R is resistance, and t is time), under the same current, the part with large resistance will generate more heat. This causes the local temperature of the resistance wire to be too high, accelerating the aging and oxidation of the resistance wire in this part, reducing its mechanical strength and further increasing its resistance value, forming a vicious circle, which may eventually cause the resistance wire to melt at the local overheating point and shorten the service life of the heating plate. Accelerate the aging of silicone rubber: Local overheating of the resistance wire will transfer too much heat to the silicone rubber in contact with it. When silicone rubber is in a high temperature environment for a long time, its molecular structure will change, such as increasing or decreasing the℃of crosslinking, causing the silicone rubber to become hard, brittle or lose elasticity, and aging phenomena such as cracking will occur. After the silicone rubber ages, its protective effect on the resistance wire is weakened, making it easy for the resistance wire to be exposed to the external environment, further accelerating the damage of the resistance wire. It will also affect the insulation and thermal conductivity of the heater, thereby shortening the service life of the entire heater. Impact on the uniformity of heat distribution: Uneven diameter and cross-sectional area of ​​​​the resistance wire will cause uneven heat distribution on the entire heater. Uneven heat distribution will cause uneven heating of the heated object, affecting the heating effect. In order to achieve uniform heating, it may be necessary to extend the heating time or increase the heating power, which will cause the resistance wire and silicone rubber to be subjected to greater thermal stress, accelerate their envelhecimento e encurtar a vida útil do aquecedor . Compartilhar do editor