%A CHEN Hongjun*, ZHANG Tiehan, WANG Changrongª¤ %T Structural characteristics of ultrahigh-pressure multistage centrifugal pump typed SDZ310 %0 Journal Article %D 2018 %J Journal of Drainage and Irrigation Machinery Engin %R 10.3969/j.issn.1674-8530.16.0257 %P 567-572 %V 36 %N 7 %U {http://zzs.ujs.edu.cn/pgjx/CN/abstract/article_2466.shtml} %8 2018-07-25 %X Functioning as core equipment in high-pressure water systems, the ultrahigh-pressure multistage centrifugal pump(UPMCP)has been widely applied in industries such as metallurgy, chemical, petroleum and electric power sectors. However, there is a difficulty in axial thrust balance on the rotor in UPMCPsand the seals between stages are damaged easily after a long period of operation experienced currently. In this paper, Structural characters of UPMCPs for phosphorus removal were studied and analyzed, and then a axial thrust self-balanced type SDZ310 UPMCP with double case was developed. The impellers were symmetrically arranged on the pump rotor to make the axial thrust on the rotor self-balanced to extend pump life-span and strength the operation alliability of pump. In consequence, the difficult problem of balancing frequently varied axial thrust, which is caused from constantly variable operation condition in phosphorus removal services, has been solved.A centralized oil supply and return system with check valves has been integrated into the pump to meet the requirements of lubrication and cooling in long-time operation. The precisely grinded screw sealsof chrome platedwere adopted in the pump to guarantee no leakage between stages during operation. Therefore, the pump can maintain a sufficient high volumetric efficiency and subsequently a better total efficiency.ª¤