北京生物医学工程

血液泵液体润滑螺旋槽止推轴承承载及溶血性能研究

Bearingand hemolytic performancesof hydrodynamic spiral groove thrust bearing for blood pump

作者：尹红磊肖艳萍杜建军

单位：哈尔滨工业大学（深圳）机电工程与自动化学院(广东深圳 518055)

关键词：人工心脏；液力轴承；螺旋槽轴承；血液相容性

分类号：R318.04

出版年·卷·期（页码）：2019·38·6（623-633）

摘要：

目的针对血液泵用的血液润滑止推轴承的平面线型，提出了一种双圆弧线平面线型，以提高止推轴承的承载性能和血液泵血液相容性。方法基于N-S方程和k-ε标准方程湍流模型，采用Fluent软件数值计算的方式，将这种线型的轴承与传统的对数螺旋线型以及斜直线型轴承进行了承载力、刚度、壁面切应力、质量流量和溶血指标的对比，对双圆弧线型螺旋槽止推轴承的槽数、槽深、槽长比等参数进行了优化以提高轴承支承力。结果双圆弧线型的螺旋槽止推轴承具有良好的承载能力，且质量流量较大，壁面剪切应力小，在血液相容性方面比其他两种轴承更有优势。优化后的双圆弧线型螺旋槽止推轴承的溶血性能均满足要求。结论对于微米级厚度的螺旋槽止推轴承，在满足轴承性能和溶血性能的基础上，为方便加工，应优先选取双圆弧线型的螺旋槽止推轴承。

Objective In order to improve the bearing capacity of thrust bearing and the compatibility of blood pump, a new type of double arc-shaped thrust bearing which is used in the blood pump thrust is proposed. Methods Based on Navier-Stokes equation and k - epsilon standard equation turbulent model, the numerical calculation method of Fluent software was adopted to compare the bearing capacity, stiffness, wall shear stress, mass flow and hemolysis indexes of this type of linear bearing with the traditional logarithmic spiral type bearing and oblique linear type bearing, and to optimize the parameters such as groove number, groove depth and groove length ratio of double-arc spiral groove thrust bearing. Results The double circular arc spiral groove thrust bearing had good load-carrying capacity, and the characteristics of large mass flow and small wall shear stress made the bearing more advantageous in blood compatibility than the other two kinds of bearings. The hemolysis performance of the optimized double arc-shaped spiral groove thrust bearing met the requirements. Conclusions For micron thickness spiral groove thrust bearing, on the basis of meeting the requirements of bearing performance and hemolysis performance, we should give priority to double arc type spiral groove thrust bearing to facilitate processing.

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