Effect of surface roughness of mechanical seals for rotary blood pumps under blood sealing
Effect of surface roughness of mechanical seals for rotary blood pumps under blood sealing
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DOI：
10.1299/jamdsm.2014jamdsm0006
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发表时间：
2014
影响因子：
0.9
通讯作者：
J. Tomioka;N. Miyanaga
中科院分区：
文献类型：
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作者：
J. Tomioka;N. Miyanaga
针对旋转式血泵轴封存在的问题，研制了一种带冷却水循环系统的微型机械密封。本文阐述了血液密封条件下密封间隙表面粗糙度对轴封问题的影响。三种阀座环的密封面粗糙度分别为Ra=0.009、0.088和0.170μm。在这项工作中，在密封间隙中的摩擦损失扭矩和血液和冷却水的泄漏进行了测量。结果表明，在Ra=0.009μm的座圈处测得的最大摩擦损失扭矩随表面粗糙度的增大而减小。在所有座圈中，冷却水的泄漏率大于血液的泄漏率，即使血液室具有较高的压力。血封和水封的封闭特性不同。而且，最佳表面粗糙度在扭矩和泄漏特性上也有所不同。因此，在旋转式血泵机械密封的设计中，研究血液密封下的表面粗糙度是非常重要的。
A miniature mechanical seal with the cooling water circulating system has been developed as a solution of the shaft seal problems in rotary blood pumps. The present paper describes the effect of the surface roughness in the sealing gap on the shaft seal problems under blood sealing. The sealing surface roughness of tested three seat rings were designed to be Ra=0.009, 0.088 and 0.170μm. The frictional loss torque in the sealing gap and the leakage of the blood and the cooling water were measured in this work. Results show that the maximum frictional loss torque measured in the seat ring of Ra=0.009μm, and the frictional loss torque decreased as the surface roughness increased. The leakage rate of the cooling water is larger than that of the blood in all seat rings, even though the blood chamber has higher pressure. The sealing characteristics between under the blood and water sealing were different. Moreover, the best surface roughness in the torque and the leakage characteristics were also different. Thus, it is important to study under blood sealing in the design of the surface roughness of the mechanical seals for rotary blood pumps.