Ze-Sheng Wang, Fu-Qin Yang, Yu-Meng Song, Xiao-Jie Han
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引用次数: 0
摘要
为了提高内拌和机端面机械密封的密封性能,延长其使用寿命,本文将表面纹理技术引入到端面机械密封中。在旋转密封环上设计了不同排列的等腰直角三角形纹理,研究了纹理参数和工作参数对纹理机械密封性能的影响。结果表明,在稳态条件下,不同排列的等腰直角三角形纹理会产生明显的流体动力压力效应,并使机械密封产生油膜容量。同时,Rt2 排列的机械密封能获得最低的端面泄漏。此外,当纹理面积比 Sp = 21%、39%、21%、30% 时,Rt1、Rt2、Rt3 和 Rt4 布置的密封性能较好,当纹理深度 hp = 2∼4 μm 时,四种布置的密封性能也较好。适当降低转子转速 n 和增加润滑油粘度 η 有助于提高纹理机械密封的工作性能。在非稳态条件下,纹理机械密封的最大油膜压力、泄漏量、摩擦系数和密封间隙随载荷呈周期性变化。当 hp = 3 μm 时,Rt2 布置的泄漏量和摩擦系数较低。 此外,较低的转速和润滑油粘度有利于减少内部混合器纹理机械密封的泄漏和摩擦。
Performance of the Internal Mixer’s end Face Mechanical Seal with Isosceles Right Triangle Textures
To improve the sealing performance and prolong the service life of the internal mixer’s end face mechanical seal, the surface texture technology was introduced to the end face mechanical seal in this paper. Different arrangements of isosceles right triangle textures were designed on the rotating sealing ring to study the effects of texture parameters and working parameters on the performance of the textured mechanical seal. The results indicate that under steady-state conditions, different arrangements of isosceles right triangle textures produce obvious hydrodynamic pressure effects and cause the mechanical seal to produce oil film capacity. Meanwhile, the Rt2 arrangement mechanical seal can obtain the lowest end leakage. What’s more, Rt1, Rt2, Rt3, and Rt4 arrangements show better sealing performance when their texture area ratio Sp = 21%, 39%, 21%, 30%, respectively, so do the four arrangements when their texture depths hp = 2∼4 μm. Appropriately reducing the rotor speed n and increasing lubricant viscosity η is helpful to improve the work performance of the textured mechanical seal. Under unsteady-state conditions, the maximum oil film pressure, leakage, friction coefficient and sealing gap of the textured mechanical seal change periodically with the load. When hp = 3 μm, the Rt2 arrangement has lower leakage and friction coefficient. Further, lower speed and lubricant viscosity are beneficial to reducing the leakage and friction of the textured mechanical seal of the internal mixer.