漆膜影响下滑动轴承性能分析

发布时间：2018-01-15 23:23

本文关键词：漆膜影响下滑动轴承性能分析　出处：《润滑与密封》2017年07期 　论文类型：期刊论文

【摘要】：漆膜是润滑油中一种化学反应的产物。为了分析漆膜对滑动轴承性能的影响,将漆膜简化为轴承承载区内的突起状矩形积垢物,在Reynolds方程基础上,通过修改轴承间隙函数及其对角度的偏导数来考虑不规则间隙影响,应用有限差分法建立含漆膜滑动轴承性能计算模型,分析含漆膜轴承和无漆膜轴承内压力分布、油膜厚度、轴颈中心位置、温升等特性。结果表明,含漆膜轴承承载区内同时存在漆膜引起的台阶流动和轴承收敛间隙引起的挤压流动效应,台阶流效应改变了滑动轴承油膜压力分布特性和轴承承载特性,导致轴颈平衡位置发生改变;漆膜越厚,偏心率和偏位角越小;出现漆膜后,轴承最小油膜厚度减小,最大油膜压力增大,承载能力减小,润滑油温升增大,对轴承安全运行将产生不利影响;漆膜张角较小时,最小间隙附近台阶流动形成的动压效应明显,容易形成局部高压和高温,漆膜张角增大到一定程度后,漆膜对轴承性能的影响趋于平缓。
[Abstract]:The paint film is the product of a chemical reaction in lubricating oil. In order to analyze the influence of paint film on the performance of sliding bearing, the paint film is simplified as the bulge rectangular dirt in bearing bearing area. On the basis of Reynolds equation, the influence of irregular clearance is considered by modifying the bearing clearance function and its partial derivative to the angle, and the finite difference method is applied to establish the performance calculation model of the sliding bearing with lacquer film. The characteristics of pressure distribution, oil film thickness, central position of shaft neck and temperature rise in film bearing and non film bearing are analyzed. The step flow caused by paint film and the squeeze flow effect caused by the convergence gap of bearing change the oil film pressure distribution characteristics and bearing bearing bearing load characteristics in bearing bearing bearing with paint film. The balance position of the journal is changed; The thicker the film is, the smaller the eccentricity and the deviation angle are. After the appearance of paint film, the minimum oil film thickness of bearing decreases, the maximum oil film pressure increases, the bearing capacity decreases, and the temperature rise of lubricating oil increases, which will have an adverse effect on the safe operation of bearing. When the opening angle of the film is small, the dynamic pressure effect formed by the step flow near the minimum gap is obvious, and it is easy to form local high pressure and high temperature. When the film angle increases to a certain extent, the influence of the film on the bearing performance tends to be gentle.
【作者单位】：广东电网有限责任公司电力科学研究院;东南大学火电机组振动国家工程研究中心;
【基金】：中国南方电网有限责任公司科技项目(GDKJ00000004)
【分类号】：TH133.31
【正文快照】： 滑动轴承是汽轮发电机组、压缩机等大型旋转机械的重要部件,起着支撑转子的关键作用。滑动轴承出现故障后,对机组安全、稳定与可靠运行的影响很大。漆膜又称之为积碳、结胶,是润滑油中一种化学反应的产物,是一种新的与基础油和添加剂完全不同的化学物质。漆膜生成机制理较为复

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