8字形盘密封螺旋泵滑动摩擦特性

Sliding friction characteristics of 8-shaped disc seal screw pump

摘要

完全自驱型8字形盘密封螺旋泵被提出用于实现海上溢油的高效可靠泵送,其运行过程中滑动摩擦特性是影响运行稳定性和使用寿命的决定性因素,但目前针对这方面的研究仍未开展。基于8字形盘密封螺旋泵啮合原理,建立8字形盘-螺杆转子啮合副瞬时接触线方程及啮合副间相对滑动速度计算模型,对啮合副间瞬时接触线及相对滑动速度的分布规律及影响因素进行研究。结果表明:啮合副间瞬时接触线波动剧烈程度随8字形密封盘大圆弧半径及中心距增大而增大,波动范围随密封盘边缘圆弧半径增大而增大,瞬时接触线波动幅度在8字形密封盘啮入螺杆处最深时最大;啮合副瞬时接触线上的相对滑动速度随着中心距增大而增大;通过瞬时接触线的空间曲线,可以更直观地反映啮合副间的接触摩擦特征。

Abstract

A fully self-driven 8-shaped disc seal screw pump has been proposed for the efficient and reliable pumping of marine oil spills. During its operation, the sliding friction characteristics are the decisive factors affecting its operational stability and service life. However, the research in this area has not yet been carried out. Based on the meshing principle of the 8-shaped disk sealed screw pump, the instantaneous contact line equation of the 8-shaped disk-screw rotor meshing pair and the calculation model of the relative sliding velocity between the meshing pairs were established, and the distribution laws and influencing factors of the instantaneous contact line and the relative sliding velocity between the meshing pairs were studied. The results indicate that the severity of fluctuation in the instantaneous contact line between the meshing pairs increases with larger major arc radius of the infinity-shaped seal disk and centre distance, and the fluctuation range increases with a larger edge arc radius of the seal disk. The fluctuation amplitude of the instantaneous contact line reaches its maximum at the deepest meshing point where the infinity-shaped seal disk engages with the screw. The relative sliding velocity along the instantaneous contact line of the meshing pair increases with the increase in the centre distance. The spatial curve of the instantaneous contact line provides a more intuitive representation of the contact and friction characteristics between the meshing pairs during operation.

关键词

8字形盘 / 螺旋泵 / 滑动摩擦特性 / 理论建模

Key words

8-shaped disc / screw pump / sliding friction characteristics / theoretical modeling

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基金资助

装备预研教育部联合基金项目(8091B03052306)

泰山学者工程专项(tsqn202312112)