电工技术学报  2022, Vol. 37 Issue (6): 1595-1606    DOI: 10.19595/j.cnki.1000-6753.tces.L90305
高电压与放电 |
考虑空间形位偏差的万能式断路器关键零件断裂失效研究
周学, 李东晖, 金玥, 翟国富
哈尔滨工业大学电器与电子可靠性研究所 哈尔滨 150001
Fracture Failure Process of Key Part of Air Circuit Breaker Considering Spatial Shape and Position Deviation
Zhou Xue, Li Donghui, Jin Yue, Zhai Guofu
Reliability Institute for Electric Apparatus and Electronics Harbin Institute of Technology Harbin 150001 China
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摘要 在万能式断路器合闸时,弹簧所储存的能量以撞击的形式经打击杆传递给连杆机构。由工艺因素引起的打击杆形位偏差对打击杆的断裂过程产生影响,使操作机构的使用寿命远低于设计指标。该文根据多体动力学理论,建立操作机构的虚拟样机模型。通过试验采集储能杠杆和联动轴的运动状态,对虚拟样机的准确性进行验证。然后使用实际产品的测量数据,获得打击杆端点相对滚子的空间形位偏差范围。再使用虚拟样机参数建模表现偏差情况,分析打击杆载荷峰值和裂纹萌生周期的变化。最后假设打击杆上已存在椭圆形裂纹,研究偏差对裂纹尖端应力强度因子的影响。该文给出打击杆空间形位偏差对其断裂过程的影响,可以为设计及工艺改进提供理论指导。
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周学
李东晖
金玥
翟国富
关键词 万能式断路器断裂过程偏差影响    
Abstract:During the closing process of an air circuit breaker (ACB), energy stored in main spring is transferred to four-linkage mechanism through its driving shaft in the form of impact. Position deviations on the striking rod caused by machining and assembly tolerance lead to the fatigue and the final fracture of the driving shaft. This makes operational lifespan of the mechanism inconsistent with the expected design one. Based on multi-body dynamics, a virtual prototype model of the mechanism is established. Accuracy of the virtual prototype is verified by testing rotational positions of two shafts around which the energy storage lever and the linkage shaft rotate. Then, using the measurement data, the spatial deviation range of the end point of the driving shaft relative to the roller is obtained. Then the virtual prototype parameters are used to model the deviation, and the variation of peak load and crack initiation period is calculated. Finally, it is assumed that there is an elliptical-type crack on the driving shaft, and the influence of the deviation on the SIF at the crack tip is studied. In this paper, the influence of the spatial deviation of the driving shaft on its fracture process is given, which can provide theoretical guidance for design and manufacturing.
Key wordsAir circuit breaker    fracture process    tolerance effect   
收稿日期: 2020-07-09     
PACS: TM561.1  
基金资助:国家自然科学基金资助项目(51707044)
通讯作者: 李东晖 男,1992年生,助理工程师,研究方向为航天电器可靠性设计及优化。E-mail: ldh920918@qq.com   
作者简介: 周 学 男,1982年生,博士,研究方向为航天电器电弧等离子体理论与试验技术。E-mail: zhouxue@hit.edu.cn
引用本文:   
周学, 李东晖, 金玥, 翟国富. 考虑空间形位偏差的万能式断路器关键零件断裂失效研究[J]. 电工技术学报, 2022, 37(6): 1595-1606. Zhou Xue, Li Donghui, Jin Yue, Zhai Guofu. Fracture Failure Process of Key Part of Air Circuit Breaker Considering Spatial Shape and Position Deviation. Transactions of China Electrotechnical Society, 2022, 37(6): 1595-1606.
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