一种轴流血泵的磁液双悬浮支承系统

【摘 要】 目的:为解决第三代血泵中磁力和液力悬浮系统体积偏大、发热多、水力性能差、血损严重等问题，提出一种磁液双悬浮支承系统。 方法:磁液双悬浮支承系统轴向靠磁力、径向靠径向液力共同实现转子的稳定悬浮；分别利用ANSYS电磁模块和楔形动压承载原理对轴向磁力、径向液力进行分析，利用Fluent对磁液双悬轴流血泵的水力性能进行仿真分析。 结果:对悬浮系统轴向、径向承载力的分析以及悬浮实验结果表明该系统可以实现稳定的悬浮；Fluent仿真及水力实验表明当血泵转子转速为9 500 r/min以上时，能满足人体需要。 结论:磁液双悬浮支承系统具有较好的悬浮性、水力性能，可作为第三代血泵进一步改进的选择方向。

Magnetic-hydraulic suspension supporting system for axial blood pump

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.