塑料外壳式断路器的跌落力学特性模拟研究

Mechanical behaviors of moulded-case circuit-breakers in falling process

塑料外壳式断路器需要具备良好的力学特性以保证其运输和使用安全。本文建立塑料外壳式断路器和地面的有限元模型,以极限工况水平垂直下落为例,分析塑料外壳式断路器在跌落过程中的应力变化和变形情况。结果表明,塑料外壳式断路器各部件的应力和变形呈不均匀分布,内部构件由于应力波的影响会产生最大的应力,装饰板由于受到其他部件的影响变形最剧烈。最大应力和最大变形量均出现在塑料外壳式断路器离开地面的反弹过程中。本研究可为避免跌落破坏的塑料外壳式断路器结构设计提供参考。

Moulded-case circuit-breakers needs greater structure strength to ensure its safety in the use and shipment.The finite element model for moulded-case circuit-breakers and ground is built in thisPaper.The stress and deformation of the moulded-case circuit-breakers are both investigated in the extreme condition when the moulded-case circuit-breakers atr vertically positioned to fall down.The results show that the stress and deformation is distributed asymmetrically.The maximum stress and deformation appear at the internalParts and the decorative plate due to impact stress wave,respectively,which also arise in the rebound process.The research provides scientific guidelines for designing the moulded-case circuit-breakers to avoid the falling.