CDJY2500型压裂泵曲轴的力学性能分析

Analysis of Mechanical Properties of Crankshaft on the CDJY2500 Fracturing Pump

为了对五缸压裂泵曲轴进行优化设计,对CDJY2500型五缸压裂泵曲轴进行正常工作载荷下的受力综合分析,建立了压裂泵曲轴的有限元模型。采用有限元仿真计算方法及ANSYSWorkbench对10种危险工况和5种不同连杆载荷下的曲轴应力和总变形量分布规律进行分析。分析结果表明:曲轴的最大应力为180. 23 MPa,位于曲轴1#曲柄销的左侧圆角处,曲轴的总变形量在其两端较大、中间较小,最大为0. 067 815 mm,属于小变形;随着曲轴转角的增大,曲轴最大应力基本上先增大再减小,在180°转角时达到峰值;随着转角的增大,曲轴的总变形量有先逐渐减小后增大、再减小的趋势,在36°转角时取得最大值;最大应力和总变形量均随着连杆载荷的增加而增大,且呈线性关系。因此,在曲轴转动过程中,其危险点主要分布在曲轴颈的圆角处,连杆载荷对曲轴强度有重大影响。研究结果对压裂泵曲轴等关键部件的优化设计及动态性能研究具有重要意义。

To optimize the design of the crankshaft of a five-cylinder fracturing pump,and to perform a comprehensive analysis of the forces on the CDJY2500 five-cylinder fracturing pump crankshaft under normal working load,a finite element model for the crankshaft of the fracturing pump is established. The finite element simulation calculation method and ANSYS Workbench were used to analyze the crankshaft stress and total deformation distribution under 10 hazardous conditions and 5 different link loads. The analysis results show that the maximum stress of the crankshaft is 180. 23 MPa located at the left corner of the crankshaft 1# crank pin. The total deformation of the crankshaft is larger at its two ends and smaller in the middle with the maximum value of 0. 067 815 mm,which is a small deformation. With the increase of the crank angle,the maximum stress of the crankshaft generally increases and then decreases,reaching a peak at 180°. As the angle of the crank increases,the total deformation of the crankshaft gradually decreases and then increases,and decreases. The maximum value was observed at the angle of 36°. The maximum stress and the total deformation increase linearly with the load of the link. Therefore,during the crankshaft rotation,its hazardous points are mainly distributed at the corners of the crankshaft neck,and the load of the link has a significant impact on the strength of the crankshaft. The research results are of great significance to the optimization of the crankshaft and other key components of the fracturing pump.