a blank stage怎么理解啊? pumps shall be capable of at least a 5 % head increase at rated conditions by replacement of the impeller(s) with one(s) of larger diameter or different hydraulic design, variable-speed capability or use of a blank stage. 在标定条件下通过置换大尺寸或不同水工设计的叶轮(单个或多个),或者投用变速设计,或者使用空段,泵的压头应至少增加5%。 不过我也不太懂空段的含义,lz去动设备那里问问吧。查看更多