关键词: 变角调节, 运动相似, 节能分析, 离心泵

Abstract: At present, adjustment methods for operating point of centrifugal pump mainly include variable speed adjustment and variable diameter adjustment, however the two methods could not meet all demands due to some limits. Aiming at small and medium centrifugal pumping station and irrigation-drainage pumping station, we propose a variable angle adjustment method to change the pump operating conditions. According to the centrifugal pump flow characteristics and similar triangular relationship at the impeller inlet, a flow mathematical model of centrifugal pump is deduced. Taking a water supply project in Shanxi and an irrigation and drainage pumping station in Tianjin as examples, we change the pump operating conditions by adjusting the blade exit angle, and carry out an energy-saving analysis for the project in Tianjin. The results show that the variable angle adjustment can reduce the energy consumption and improve the economic benefits.

Key words: variable angle adjustment, motion similarity, energy-saving analysis, centrifugal pump