Abstract

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Title:: Magnetic-hydraulic suspension supporting system for axial blood pump

Author(s):: FENG Longfei; YUN Zhong; XU Junrui; CAI Chao; School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China

Keywords:: ; Keywords: blood pump; magnetic-hydraulic suspension; axial flow; simulation; axial magnetic force; radial hydraulic force

Abstract:: Abstract: Objective To propose a magnetic-hydraulic suspension supporting system for solving the problems of magnetic and hydraulic suspension system of the third generation blood pump, such as large volume, high fever, poor hydraulic performance and serious blood damage. Methods The magnetic-hydraulic suspension supporting system relied on magnetic force in the axial direction and passive hydraulic force in the radial direction to realize the stable suspension of the impeller. The axial magnetic force was analyzed by ANSYS electromagnetic module and the radial hydraulic force was analyzed by wedge dynamic pressure bearing principle. The hydraulic performance of magnetic-hydraulic suspension axial blood pump was simulated by Fluent. Results The analysis of the axial and radial bearing capacity of the suspension system and the results of suspension experiments proved that the suspension system could achieve a stable suspension. Fluent simulation and hydraulic experiments showed that when the rotor speed of the blood pump was above 9 500 r/min, the blood pump met the needs of the human body. Conclusion The magnetic-hydraulic suspension supporting system had good suspension and hydraulic performances, which can provide a possibility for the further improvement of the third generation blood pump.