【摘要】 为了提高往复式密封的密封性能,对密封区内杆-密封界面的流变特性进行分析。基于变形理论,通过引入混合润滑状态下弹性流体动压润滑数值模型,进一步揭示了往复式密封的密封机理。基于此理论模型同时考虑多耦合场的相互作用,通过引入流体方程(考虑空化现象)、微观接触模型以及变形模型,进一步分析了不同密封表面粗糙度、润滑油黏度以及密封杆运动速度下对摩擦力、摩擦因数以及泄漏量的影响,并开展了相应实验验证。研究结果表明:密封表面粗糙度越大,界面摩擦力和泄漏量都随之增加;界面摩擦力随润滑油黏度、密封杆速的增加而降低,泄露却呈现出相反的趋势。更多还原

【Abstract】 Aimed to improve the sealing performance of reciprocating seals,the rheological characteristics of the rod-seal interface in a sealing zone are investigated. Based on the theory of deformation,a numerical model of elastohydrodynamic lubrication under mixed lubrication is introduced to further reveal the sealing mechanism of reciprocating seals. The influences of working conditions such as different seal surface roughness,viscosities of hydraulic oil and rod velocities on friction,friction coefficient and leakage are analyzed by introducing fluid equations(considering cavitation),a micro contact model and a deformation model. The effectiveness of the method is verified by experiments,and a test rig is developed to validate the theoretical analysis. The results show a lower seal surface roughness yielding a larger friction force and leakage. The friction force decreases with the increase of the oil viscosity and the seal rod velocity,but the leakage presents an opposite trend. Therefore,a reasonable seal surface roughness and viscosity of hydraulic oil are of great significance to improve the anti-wear abilities of materials and reduce environmental pollution.更多还原