高压断路器弹簧操动机构合闸弹簧可靠性分析

针对高压断路器弹簧操动机构合闸弹簧失效问题,运用可靠性设计理论对其进行分析研究,找出了弹簧因疲劳可靠度不足而失效的原因,并提出了解决问题的措施。常规设计是将弹簧外载荷、几何尺寸、材料强度性能等参数是看作确定量,实际上由于受材质、制造、测量等条件的影响,这些参数是不确定的,所以往往导致零件因不可靠而失效。可靠性设计将这些参数视为随机变量,运用概率统计的方法分析弹簧的强度,定量回答了弹簧的失效概率问题,使人对弹簧的质量有了更加准确的把握。提高弹簧的疲劳可靠度可从改进弹簧尺寸参数、材料、制造工艺、受力状况等多方面入手,但对于旧设备,应该根据实际情况从经济性、工艺性、可行性方面考虑。通过比较选择了弹簧表面喷丸处理的最佳改进方法。

Closing Switch Spring Reliability Analysis & Improvement of High Voltage Circuit Breaker Operating Mechanisms

Considering closing mechanisms in high voltage spring failure of operating circuit breaker, reliability design theory was applied to analyze it, and found reason of spring failure because of lacking fatigue reliability, and offered some measures to solve the problem. In convention design theory, spring parameters such as outer load, geometry, and material strength properties are regarded as certainty. In fact, affected by material, manufacture, and measurement, they are uncertain so as to cause spring failure because of lacking reliability usually. In reliability design theory, these parameters were taken as random variables and used probability statistics method to study spring intensity. It offered a quantitative answer to the probability problem of spring failure, and people can assure the quality of spring. Solution of the problems includes improvement of spring geometric size, material, manufacturing technology, and bearing condition, but for the old equipment, some actual conditions such as economization, technology, feasibility should be considered. By comparison;shot-peening to deal with spring surface was chosen as the best way finally. Improvement result showed spring fatigue reliability was sufficient.