北京生物醫(yī)學(xué)工程

血液泵液體潤滑螺旋槽止推軸承承載及溶血性能研究

Bearingand hemolytic performancesof hydrodynamic spiral groove thrust bearing for blood pump

作者：尹紅磊肖艷萍杜建軍

單位：哈爾濱工業(yè)大學(xué)（深圳）機電工程與自動化學(xué)院(廣東深圳 518055)

關(guān)鍵詞：人工心臟；液力軸承；螺旋槽軸承；血液相容性

分類號：R318.04

出版年·卷·期（頁碼）：2019·38·6（623-633）

摘要：

目的針對血液泵用的血液潤滑止推軸承的平面線型，提出了一種雙圓弧線平面線型，以提高止推軸承的承載性能和血液泵血液相容性。方法基于N-S方程和k-ε標(biāo)準方程湍流模型，采用Fluent軟件數(shù)值計算的方式，將這種線型的軸承與傳統(tǒng)的對數(shù)螺旋線型以及斜直線型軸承進行了承載力、剛度、壁面切應(yīng)力、質(zhì)量流量和溶血指標(biāo)的對比，對雙圓弧線型螺旋槽止推軸承的槽數(shù)、槽深、槽長比等參數(shù)進行了優(yōu)化以提高軸承支承力。結(jié)果雙圓弧線型的螺旋槽止推軸承具有良好的承載能力，且質(zhì)量流量較大，壁面剪切應(yīng)力小，在血液相容性方面比其他兩種軸承更有優(yōu)勢。優(yōu)化后的雙圓弧線型螺旋槽止推軸承的溶血性能均滿足要求。結(jié)論對于微米級厚度的螺旋槽止推軸承，在滿足軸承性能和溶血性能的基礎(chǔ)上，為方便加工，應(yīng)優(yōu)先選取雙圓弧線型的螺旋槽止推軸承。

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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