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| Sensitivity of different sealing structures to axial movement of centrifugal pump impeller |
| LI Yibin1,2*,DAI Xiaohui1,WANG Zhengkai1 |
| 1. School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Key Laboratory of Fluid Machinery and Systems, Gansu Province, Lanzhou, Gansu 730050, China |
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Abstract To reveal the quantitative relationship between axial movement, axial force of centrifugal pump impeller and seal-ring structure, the influence and mechanism of axial movement on the hydraulic performance and axial force of centrifugal pump were studied for two types of sealing structures, namely single and double seal-ring. The results show that compared with the single seal-ring structure, the double seal-ring structure has a significant inhibitory effect on high-pressure liquid lea-kage, and its volumetric efficiency is higher. Under rated operating conditions, the head and efficiency of the double seal-ring structure pump are increased by 0.60%, and the experimental and numerical errors are less than 4%; the total axial force of the single seal-ring structure is less than the double seal-ring structure. The rotor axial movement significantly affects the impeller reaction force, shroud force and total axial force. When the axial movement ΔL=1 mm, the impeller work capacity is strong and the hydraulic performance of the pump is optimal; when the impeller moves toward the inlet, the impeller work capacity is weakened, resulting in the degradation of hydraulic performance of the pump. The axial movement of the rotor causes the volute section form an asymmetric reverse vortex, which affects the speed distribution law of the volute and impeller.
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Received: 04 July 2019
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