一、前言大型立式轴流泵因其流量大,扬程适宜、功耗低和占地小的优点而被广泛用作船坞坞室排水的主要设备。我国解放后新建的船坞大多采用这种设备,具体情况如表Ⅱ所示。 40吋及其以上的立式轴流泵称为大型立式轴流泵,从表Ⅱ中可以看出,我国新建的万吨级以上的船坞的坞室排水多来用40ZLB—50型和50ZLB—50型大型立式轴流泵。现仅对40ZLB—50 I. Introduction Large vertical axial flow pump is widely used as the main equipment for the drainage of dock docks because of its large flow, suitable lift, low power consumption and small footprint. Most of the new docks built after the liberation of China have adopted such equipment, as shown in Table II. 40 inches and above the vertical axial flow pump is called a large vertical axial flow pump can be seen from Table II, China’s new 10,000-ton docks more than the dock drainage room to 40ZLB-50 and 50ZLB -50 large-scale vertical axial flow pump. Now only 40ZLB-50