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2018-11-19View Original

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本帖最后由 3983596_FPPZ 于 2018-11-21 21:37 编辑 bk14.jpg入口压力的大小,对于离心泵的下列哪些参数有着直接影响:(多选) A.出口压力 B.扬程 C.流量 D.汽蚀 E.轴功率 答案:AD A 出口压力=泵扬程x比重+入口压力,所以答案A是符合的; B 扬程是泵本身固有的性能参数,不论什么介质,扬程是不变的,只有介质确定后,出口压力才与扬程有关系,关系见答案A,所以答案B是不符合的; C 流量跟扬程一样,是泵本身固有的性能参数,所以答案C是不符合的; D 泵汽蚀状态受入口压力直接影响,入口压力比介质汽化压力大很多,泵就不容易汽蚀,否则泵就很容易汽蚀抽空,无法使用。答案D是符合的 E 轴功率是根据流量、扬程、比重、效率计算得到的数值,是泵消耗的功率,只要泵正常运行,就与入口压力没有联系,答案E是不符合的
Reply #22018-11-19
A.出口压力 B.扬程 C.流量 D.汽蚀余量NPSHr
Reply #32018-11-19
A.出口压力 B.扬程 C.流量 D.汽蚀余量NPSHr

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