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 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.

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型式：有连绩式环型切片及密式焊接切片。

Types: continuous ring disc and dense teeth welding disc.

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重新设计粒化轮轴承的密封型式，并在轴承座外增加甩水环，解决了粒化轮卡死的问题；

They are redesigning the seal form of the bearing seat of granulation wheel and adding swing water ring out of the bearing seat, then lock question of the granulation wheel was solved;

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