| 摘要 |
PURPOSE:To reduce the affect of corrosion to an impeller due to the cavitation of hydraulic water and as well to simplify the manufacturing of the pump, by forming the impeller with a plurality of axially divided sections, and by enabling the sections to be replaced with each others. CONSTITUTION:An impller 31 is axially divided into a plurality of sections. The divided impeller part 31a in the middle section is formed of a cast made of cast iron having a good castability, such as, for example, ductile cast iron, and divided impeller parts 31b in both end sections are made of cast iron such as, for example, ductile cast iron or stainless steel of corrosion resistant material. Further, the divided parts 31a, 31b are axially fastened so that their end face are mated together and then, are mounted onto a rotary shaft 32, thereby, they may be replaced together. |
