一、引言当前各泵厂生产的IS型离心泵,在吸入室内都装有一片上置挡板,是为了消除预旋的影响。但吸入室结构形式会直接影响泵的性能,它们之间是有内在联系的。为此,作者对四种吸入室结构不同的离心泵的性能进行了系统测试,得到了它们之间的关系,并且发现当前设计生产的IS型泵的吸入室结构形式不尽合理,应该改进。 I. INTRODUCTION At present, the IS centrifugal pumps manufactured by each pump factory are equipped with a piece of upper baffle in the suction chamber to eliminate the influence of pre-rotation. However, the suction chamber structure will directly affect the performance of the pump, there is an inherent relationship between them. Therefore, the authors systematically tested the performance of four centrifugal pumps with different suction chamber structures and got the relationship between them. It was found that the structure of the suction chamber of the IS pump currently designed and manufactured was not reasonable and should be improved.