Blood sealing properties of mechanical seals for a rotary blood pumps

研究了回转式血泵机械密封密封面表面粗糙度对轴封性能的影响。这种机械密封配有循环冷却水系统，用于在密封面上进行润滑、冷却和清洗。采用表面粗糙度Ra=0.009μm、Ra=0.088μm、Ra=0.170μm和Ra=0.250μm的几种不同表面粗糙度的机械密封，对其泄漏率、扭矩和温度变化进行了测量。用离子色谱法测定渗漏量。扭矩由扭矩计测量，温度变化由安装在阀座环上的温度计测量。结果表明，采用Ra=0.088μm的阀座环时，扭矩和温度变化最小；采用Ra=0.009μm的阀座环时，密封液泄漏量最小，小于0.1ml/3h。

The objective of this work is to study the effects of the surface roughness of the sealing face in the mechanical seal for rotary blood pumps on the characteristics of the shaft seal. This mechanical seal is incorporated with a circulating cooling water system for the lubrication, cooling and washing in the sealing face. In this paper, the several types of mechanical seals which have the different surface roughness of Ra=0.009μm, Ra=0.088μm, Ra=0.170μm and Ra=0.250μm were used, and the leakage rate, the torque and the temperature change were measured. The leakage was measured by ion chromatography. The torque was measured by a torque meter and the temperature change was measured by a thermometer which was set in the seat ring. As the results, the torque and the temperature change have the minimum value by using the seat ring of Ra=0.088μm, and the sealed fluid leakage rate has the minimum value of less than 0.1 ml/3h by using the seat ring of Ra=0.009μm.