蜗壳流道高效泵装置研究

Research on efficient pump device with new type volute passage of large pumping station

通过流道水工模型试验和泵装置模型试验,对大型泵站蜗壳进出水流道进行了深入的研究。在原设计方案的蜗壳进水流道中加设了隔涡板,有效的阻止了进水流道中水流的旋转,使装置效率提高了15%;对蜗壳出水流道的导水锥、扩散管和蜗壳段的型线进行了优化,有效的降低了水力损失,使装置效率又提高了6%,最高效率达到了78.2%。该蜗壳进出水流道高效泵装置的研制与开发拟补了以往蜗壳流道泵装置效率不高的缺点,为蜗壳进出水流道在大型低扬程泵站中进行推广和应用奠定了基础。

In this work, the inlet and outlet volute passages of large pumping stations were comprehensively studied by hydraulic model tests and device model experiments to improve the performance of pump devices. The model test shows that, under unsymmetrical inlet conditions a vortex was formed in the bell-shape suction box of the original design, while a clapboard placed in the box eliminates this vortex and raises the efficiency of pumping set by 15 % . To optimize the hydraulic design further, a series of schemes were tested and the major geometrical parameters with excellent hydraulic performances were obtained for the guide-water cone, the diffuser and the volute of the outlet volute passage. This optimization raises the efficiency of model pump by another 6%, and thus results in a maximum efficiency of 78.2% . The present study of efficient pump device with new type volute passages has overcome the low efficiency defect of the pump with traditional volute passages, and hence laid a foundation for ptotcotion and application to the inlet and outlet volute passages of the large-size low-lift pumping stations.