闭式或半闭式叶轮盖板与泵壳之间空腔液体的压强较吸入口侧高，使叶轮遭受指向吸入口方向的轴向推力。
且在长期运行中情况比较稳定，采用该型式叶轮的泵轴向力较小，且可以在前后盖板上设置副叶片。
And the situation in the long-term stable operation, use the type of impeller shaft to the edge of the smaller, and can be set up before and after the Vice-leaf cover.
本文对涡轮机中轴流叶轮盘的激振源，特别是行波振动诱发的轴向力、力的性质、对振动的影响等作了分析。
The exciting sources for axial vibration of disk, especially the new axial gas dynamic force induced by travelling waves and its properties, and influence on the vibration of disks are studied.
泵的轴向力由叶轮设平衡环来进行平衡。
The axial force of pump is balanced by balancing ring on impeller.
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