中文摘要：

在收敛锥面密封和多孔端面机械密封研究的基础上，提出了锥面-微孔组合端面新型机械密封，建立了该组合密封端面液膜压力控制的理论模型并采用有限元法求解，获得了端面液膜压力分布。在给定径向微孔比、周向微孔比和微孔深径比等微孔几何结构参数的条件下，分析了端面锥度、锥面宽度比、扇形微孔区的径向位置等组合密封几何结构参数在低压和高压工况下对密封性能的影响规律，研究了组合密封的开启特性，指出了锥面与扇形微孔区不同组合方式的特点及各自的使用范围。结果表明：在低压工况下，收敛锥面能提高机械密封的开启特性，扇形微孔区开设在端面高压侧能获得较好的密封性能；在高压工况下，微孔的动压效应能提高机械密封的稳定性，扇形微孔区设在低压侧能获得较好的密封性能；当端面特征几何结构参数选取为：锥度1．5～2．5，锥面宽度比0．2～0．6，内坝区宽度比0．1～0．3时，密封可获得优良的综合性能。

英文摘要：

Based on the study of mechanical face seals with convergent coning or surface micropores, a new type of mechanical seal with both surface micropores and convergent coning was presented. The definitions of face geometric parameters of such a new type of seal were made. Such parameters included the radial taper of the coned face, the width ratio of the coned face to the seal face, and the width ratio of sealing dam to seal face. A theoretical analysis model for controlling fluid film pressure between the two faces of such a seal was set up and was solved with the finite element method. The fluid film pressure profile between the faces was then obtained. Analyses were made about the effect of face geometric parameters on seal performance, such as opening force, leakage and axial film stiffness under low pressure or high pressure of the sealed medium, in which the radial length ratio of micropore zone to face width, circumferential arc length ratio of micropore zone to face circumference, and depth to diameter ratio of a micropore were kept constant. When such a seal was operated under low pressures of the sealed medium, the convergent taper would be beneficial to face opening behavior and the fan-type micropores sector located at the high pressure side of sealing face would be beneficial to sealing ability. When such a seal was operated under high pressures of the sealed medium, the hydrodynamic effect caused by micropores would be beneficial to sealing stability, and the fan-type micropores sector located at the low pressure side would be beneficial to sealing ability. Such a seal would show the best performance when the radial taper varied from 1.5 to 2. 5, the width ratio of the conical face to the gross seal face varied from 0. 2 to 0. 6, and the width ratio of the inner sealing dam to the gross seal face varied from 0. 1 to 0.3.