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Cao W.,Jiangsu University | Gao Y.,Jiangsu University | Wang X.,Jiangsu University | Xu R.,Nanjing Lanshen Pump Corporation Group Ltd.
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering | Year: 2012

The flow passages and rotor system of a coal mine submersible centrifugal pump were built by the 3D software Pro/E, and an unstructured mesh was generated in the passages with the software ICEM. The characteristics of such a multistage pump were estimated through the code CFX at different operating conditions based on the Reynolds time-averaged Navier-Stokes (RANS) equations combined with the standard k-ε turbulence models and SIMPLEC scheme, and compared with experimental data, their reliability was confirmed. The simulated fluid flow results were input into Ansys Workbench to calculate the modes of the rotor system with two pivots by using fluid-structure interaction method, it was found that the first order critical speed of the rotor system was lower than the pump rotational speed. According to the deformation patterns of the rotor system the rotor system was redesigned with three pivots, the calculated critical speed of the new rotor system met the design requirement. Obviously, the life span of bearings will be extended. The results show that the quick damage of bearings 7217AC/DB and serve erosion of wearrings are mainly due to the too low critical speed of the original rotor system. The critical speed of the three point rotor system is higher than the pump rotational speed and it will greatly improve the reliability of both bearings and sealing-rings.


Shi W.,Jiangsu University | Zhang L.,Jiangsu University | Chen B.,Nanjing Lanshen Pump Group Company Ltd | Jiang T.,Jiangsu University | Zhang H.,Jiangsu University
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering | Year: 2012

The unsteady flow in centrifugal pumps induces a pulsation in fluid pressure inside the volute channel and imposes a radial force on the volute wall too. Thus effect of the gap between the volute tongue and impeller outlet on them was tackled by means of a non-overload submersible sewage pump with extremely thickened-blades. Three pump models with different base circle diameters, such as 390, 435 and 460 mm were designed. The unsteady flow fields in those models were obtained numerically based on the standard k-ε turbulence model and SIMPLE algorithm. The characteristics of pressure pulsation on the tongue and the radial force on the wall against gap were obtained. The results showed that the pressure pulsation and the radial force presented an obvious periodicity due to the rotor-stator interaction. The dominant frequency of pressure pulsation at the monitor points in the volute was the blade passing frequency. At the same flow rate, the intensity and amplitude of pressure pulsation at the dominant frequency were increased with decreasing gap. The time-averaged radial force imposed on the wall was decreased and then increased with increasing flow rate. Compared with the original pump model, the averaged radial force in the new models was increased regardless of gap at the same flow rate.

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