柔性极靴磁脂密封温度场和传热性能的研究

发布时间：2018-09-11 14:54

【摘要】：针对现有磁脂密封密封能力有限、运行时极靴易与转轴发生刚性磕碰;而刷式密封摩擦生热较大、不能实现零泄漏等问题,综合磁脂密封与刷式密封的特点,提出了新型柔性极靴磁脂密封。利用GAMBIT和FLUENT软件建立柔性极靴磁脂密封的数值分析模型,对比分析了柔性极靴磁脂密封理论上的温度场分布以及磁脂温升规律等传热特性。结果表明:密封的接触线速度、柔性丝的直径、排列倾角和安装过盈量都会对磁脂温度变化产生一定的影响;排列倾角和安装过盈量对磁脂温升的影响有限。由于涂层厚度过小,改变涂层材料,对磁脂温度的影响较小。此外,建立了柔性极靴磁脂密封试验系统,验证了随着转轴转速的增加,柔性极靴密封功耗和磁脂温度会有明显的上升。
[Abstract]:In view of the limited ability of the existing magnetogrease seal and the rigid bumping between the pole boots and the rotating shaft during operation, the characteristics of the magnetic grease seal and the brush seal are synthetically combined with the characteristics of the magnetogrease seal and the brush seal, which are characterized by the large friction heat generation and the failure to realize zero leakage of the brush seal. A new type of flexible pole boot magnetic grease seal is proposed. The numerical analysis model of flexible pole boot magnetic grease seal was established by using GAMBIT and FLUENT software. The heat transfer characteristics of the flexible pole boot magnetic grease seal such as the temperature field distribution in theory and the law of magnetic grease temperature rise were compared and analyzed. The results show that the contact line velocity of seal, the diameter of flexible wire, the angle of arrangement inclination and the amount of interference of installation all have certain influence on the temperature change of magnetic grease, and the influence of the angle of arrangement and the amount of interference of installation on the temperature rise of magnetic grease is limited. Because the coating thickness is too small, the change of coating material has little effect on the temperature of magnetic grease. In addition, a magnetic grease seal test system for flexible pole boots is established, which verifies that the power consumption and magnetic grease temperature of flexible pole boots seal will increase obviously with the increase of rotating speed.
【作者单位】：北京化工大学;
【基金】：国家重点基础研究发展计划973项目(2012CB026000)
【分类号】：TB42

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