The experiments on different types of impeller are done by changing the clearance of wear-ring to prove that the clearance has no influence on the pump efficiency under various types of impeller.
通过改变叶轮口环间隙的大小对不同叶片型式的低比转速离心泵进行试验，证明口环间隙对低比转速离心泵效率的影响与泵叶轮的叶片的型式无关。
The efficiency of pump will be reduce with the increase of tip clearance of blade.
泵的效率随轮缘处间隙变大会有明显减小。
It is one of the important factors of ensuring the seal quality of cement sheath in a small clearance to raise slurry displacing efficiency in a slim hole.
提高小井眼水泥浆的顶替效率，是保证小间隙水泥环密封质量的重要因素之一。
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