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| Experiment and analysis for effects of impeller back vanes on axial thrust of centrifugal pump |
| LIU Zailun1,2, CHEN Taoli1*, LU Weiqiang1 |
| 1. College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Engineering Institute of Wenzhou Pump & Value, Lanzhou University of Technology, Wenzhou, Zhejiang 325105, China |
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Abstract In order to study the influence of impeller back vanes on axial thrust of centrifugal pump, the IS80-50-315 type centrifugal pump after the speed reduction was taken as the research object. By changing the width and number of the back blades, a total of 13 impeller back blade solutions were designed. The influence law of back blade width and number on pump performance, liquid pressure and axial force in pump cavity was obtained. The results show that when the number of back blades is constant, the head and shaft power of the test pump increase with the increase of back blade width, and the efficiency of the pump decreases gradually. The direction of axial thrust will change when the width and number of back vanes increase to a certain value, which will affect the stability of the whole machine operation. From the angle of balance axial thrust, the number of back vanes Z=5 and the width of back vanes t=3.5 mm are the best values, while the direction of axial thrust of centrifugal pump is normal, and the variation is small. Under the three numbers of blade, comparing the curves between the gap δ of the pump cover with the axial force coefficient cF, the smaller the gap δ, the more pronounced the effect of axial force. The present results provide a theoretical basis for the design of the back blade in engineering practice.
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Received: 04 January 2018
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