抽水蓄能发电机组球阀轴瓦黏结层应力及疲劳寿命研究  

Stress and Fatigue Life Study on Pumped Storage Machine Ball Valve Bearing Bush Bonding Layer

作　　者：牟玉壮 沈润杰[2] 王青华 黄建德 郑树青 

机构地区：[1]同济大学机械与能源工程学院,上海201804 [2]同济大学电子与信息工程学院,上海201804 [3]上海明华电力技术工程有限公司,上海200090 [4]华东桐柏抽水蓄能发电有限责任公司,天台317200

出　　处：《机电一体化》2016年第3期36-40,共5页Mechatronics

摘　　要：为了评估球阀轴瓦黏结层疲劳寿命,防止球阀轴瓦脱胶导致枢轴被卡死等严重事故发生,通过在球阀上安装振动传感器测其在CP工况、CP转P工况、P工况、P停机工况、G开机工况、G工况、G停机工况等7种工况下的振动情况,并将处理后的振动数据作为初始条件加载到球阀有限元模型中计算应力。考虑到黏结层局部脱胶的问题,将胶层分为完整黏结层和局部脱胶黏结层两种情况。根据应力分布谱线和每个应力幅值在不同工况下应力循环次数的统计,利用累积损伤理论计算出两种轴瓦黏结层的疲劳寿命。比较疲劳寿命可知局部脱胶对黏结层的寿命影响很大,应避免局部脱胶现象。由各个工况下的损伤率可知,在CP转P工况下对黏结层的损伤率最大,应降低CP转P工况下振动水平。黏结层计算所得寿命为制订轴瓦黏结层检测周期提供参考,避免脱胶现象的出现。In order to evaluate the bearing bush of ball bonding layer fatigue life to prevent ball bearing from coming unglued phenomenon, which leads to the pivot is dead serious accidents have occurred. By measuring vibra- tion of the ball valve based on installation of vibration sensor under the seven conditions include CP and CP turn P condition, P condition, P stop condition, G boot condition, G condition, G down conditions, and vibration data as the initial loading the finite element model of ball valve. Taking into account the problem of local debonding of the bonding layer, the bonding layer is divided into two parts, which are the bonding layer and the local bonding layer. According to the calculated stress distribution of spectrum line and the statistics of stress cycle number of each stress amplitude under different conditions, using the cumulative damage theory to calculate two kinds of bonding layer of bearing fatigue life. It is concluded that the effect of local debonding on the life of the adhesive layer is very large, and the phenomenon of local debonding should be avoided. The damage rate of the adhesive layer is the highest in the case of CP P, and the vibration level of the CP to the P should be reduced. And the result is the reference for making the detection cycle and avoiding the emergence of unglued phenomenon.

关 键 词：抽水蓄能发电机组 球阀 轴瓦黏结层 疲劳寿命 

分 类 号：TM31[电气工程—电机]