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介绍某钢铁厂1台球团冷却风机振动故障情况,分析了风机振动大的原因,简述了动平衡过程,并对动平衡过程中出现的异常情况进行了分析.指出试加重量较轻及滚动轴承故障容易导致影响系数分散度大,进而影响动平衡精度和效率. 相似文献
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本文主要介绍了一台排粉风机的故障分析及处理过程。从测试数据及检修结果来看,该风机电动机负荷侧端盖振动大主要是联轴器对中连接不良所致,同时风机存在一定的质量不平衡,在重新找正联轴器,并进行简单动平衡后,风机及电动机振动值均已降至较好水平。 相似文献
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通过对离心风机振动干扰力的分析,阐述了振动干扰力在稳定的状态下和离心风机系统处于弹性形变的范围之内,是离心风机进行动平衡的前提条件.启发对现场离心风机的不同振动情况进行分析,从而实现有效动平衡. 相似文献
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介绍了风机轴承过维修与动平衡故障的判别误区,通过实例对故障处理的误区进行了剖析,并对风机振动原因及处理方法作了简单介绍。 相似文献
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针对轴流风机运行中,常常碰到由于叶片的共振而产生的破坏性事故。本文通过建立叶片有限元模型进行模态分析得到叶片的各阶固有频率及相应振型,同时计算了考虑离心力影响下叶片动频率及相应振型。分析了可能产生共振的频率,为轴流风机的结构改进、结构优化以及动力修改提供理论依据。 相似文献
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概述了秦皇岛热电厂3号炉2台引风机进行提高功率的技术改造后, 高速运行时存在的振动问题;分别叙述了振动现状测试、气流激振试验及振动变化观察试验情况;分析了振动原因,提出了处理措施, 得出了处理效果良好的结论. 相似文献
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宁练 《机械工程与自动化》2005,(3):63-64
离心风机滚动轴承常因振动异常、轴承温升过高而出现事故。通过监测轴承振动、转速和温度等信号,快速、准确地进行数据处理和事故分析,将分析结果以各种图谱显示出来,并将其数据值信号特征传递给故障诊断系统,从而实现预测维修。 相似文献
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介绍大型风机的分类及其分类结构,重点分析了大型风机叶轮与轴系统的不平衡振动故障类型,故障产生的原因,及其解除故障的方法;并将方法应用到实际风机不平衡检测中,实现风机的现场动平衡校正。校正结果表明,动平衡校正能达到很好的效果。 相似文献
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In this paper, the effects of airfoils on the aerodynamic performance of small axial flow fans were investigated to reduce airflow turbulence on the blade surface and to improve the aerodynamic performance of small axial flow fans. Irregular airfoils where several convex grooves are bound in the blade pressure surface of the fans have two kinds. The wave-shaped edge is bound to the blade trailing edge of the fans and is designed from the smooth airfoil of the fans. The filtered N-S equations with the finite volume method and the standard k-? turbulence model were adopted to carry out the steady simulation calculation. The large eddy simulation and the FH-W noise models were adopted to carry out the unsteady numerical calculation and aerodynamic noise prediction. The results of simulation calculation are in good agreement with the tests, which proves that the numerical calculation method is feasible. The spectrum characteristics of aerodynamic noise of the smooth airfoil and the two kinds of irregular airfoils were analyzed. Although the fans of the three airfoils are regarded as noise sources, the vortex distribution features in the unsteady flow field are also described. Noise reduction mechanisms of the irregular designs of the airfoils were also discussed. The results of this research may provide proof of the parameter optimization and the structural design of small axial flow fans with low noise. 相似文献