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["叶片切割이 ​​轴向力的影响

2018-10-08View Original

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叶轮切割(只车叶片改变不懂,动平衡测试正常)轴向力会怎么变化,平衡孔大小如何计算。
Reply #22018-10-08
本帖最后由 3be835be65beFPPZ 于 2288--18 15:57 编辑 切割叶轮后,扬程降低;残余的轴向力应该变小。 平衡孔是离心泵轴向力平衡的典型结构,与密封环配合使用,用来降低叶轮后密封环与叶轮后轮毂之间的空腔压力以平衡掉叶轮入口面积大小的压力。 平衡孔的大小是以按照周向多个平衡孔的总面积来计算的,最后计算出的尺寸圆整一下就是每个平衡孔直径,平衡孔数量与叶片数相同,而这个总面积一般为后密封环间隙环带面积的5-7倍为宜。理论上平衡孔越大轴向力平衡效果越好,但是太大的平衡孔会导致回流到叶轮入口的介质流量变大Z泵效率变低Z而且对叶轮入口液流造成冲击干扰Z汽蚀性能不好Z所以一般取5-7倍。平衡孔一般会有3-5%的流量回流损失。 带有平衡孔结构的泵其转子轴向力因计算误差、铸造误差、加工误差、工况偏离等原因Z轴向力平衡后不一定为零Z剩余小部分残余轴向力由滚动轴承承受。 一般大流量高高比转速泵的平衡孔尺寸取大值Z小流量低比转速泵平衡孔取小值。这些内容在诸多的叶片泵设计手册书籍中的轴向力平衡章节都有介绍Z可可自行查阅。

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