高速高压旋转轴滑环式组合密封性能的研究

发布时间：2018-05-25 04:35

本文选题：滑环式组合密封 + 旋转轴密封　；参考：《上海交通大学》2014年硕士论文

【摘要】：在航天产品的研制生产中,经常需要在通高压气体的情况进行高速旋转,随着技术水平的提升,要求的高压气体压力和旋转速度不断提高,对用于测试的设备在高速高压下的旋转轴密封的可靠性、安全性等都提出了较高的要求。因此,研究高速高压旋转条件下的密封结构非常必要,同时也对航天产品的发展具有重要意义。为此,论文针对实际工况要求,对两种基于改性PTFE材料的滑环式组合密封圈在高速高压旋转条件下的密封性能进行了研究。设计了组合密封圈的密封结构,建立了计算模型和有限元模型,对两种滑环式组合密封圈进行了有限元分析。结果表明:齿形滑环式组合密封圈最大接触应力受O形密封圈预压缩量和气压影响大;方形滑环式组合密封圈最大接触应力位于O形密封圈和滑环接触面上,滑环与旋转轴接触应力受O形密封圈预压缩量和气压影响小,高压下最大接触应力偏离中心,易导致摩擦接触面受力不均而损坏。设计了高速高压旋转轴密封性能试验装置。介绍了试验装置的组成和原理,设计了试验装置中关键零件、控制系统和高压气源充气装置,确定了测试用密封圈型号尺寸。进行了高速高压磨损性能试验。通过对试验密封圈在不同转速、不同气体压力和不同O形密封圈预压缩量条件下的定时试验,分析了各因素对试验结果的影响程度。结果表明:两种测试密封圈在低压低速条件下密封性能相差不大,在高压高速条件下,齿形滑环式组合密封圈密封性能更优。进行了寿命试验。在35MPa气体压力和1200rpm转速条件下,考核了两种测试密封圈的密封寿命。结果表明:在高速高压旋转条件下,齿形滑环式组合密封圈密封寿命近3倍于方形滑环式组合密封圈。齿形滑环式组合密封圈的试验寿命大于实际工作中使用的特种橡胶O形密封圈的密封寿命,因此,齿形滑环式组合密封圈完全可以替代现有密封方式,该组合密封的应用可以大大提高设备的可靠性,为航天产品研制生产提供测试保障条件。
[Abstract]:In the development and production of aerospace products, it is often necessary to rotate at high speed in the case of high pressure gas. With the improvement of technology level, the required high pressure gas pressure and rotating speed are constantly raised. The reliability and safety of rotary shaft seal for testing equipment under high speed and high pressure are put forward. Therefore, it is necessary to study the sealing structure under the condition of high speed and high pressure rotation, and it is also of great significance to the development of aerospace products. For this reason, the sealing performance of two kinds of sliding ring combined sealing rings based on modified PTFE materials under high speed and high pressure rotating conditions is studied in this paper. The sealing structure of the combined seal ring is designed, the computational model and the finite element model are established, and the finite element analysis of the two kinds of sliding ring combined seal rings is carried out. The results show that the maximum contact stress of the toothed slip-ring combined sealing ring is greatly affected by the pre-compression volume and the pressure of the O-shaped seal ring, and the maximum contact stress of the square slip-ring combined seal ring is located on the contact surface between the O-shaped seal ring and the sliding ring. The contact stress between the sliding ring and the rotary shaft is less affected by the precompression and pressure of the O-shaped seal ring, and the maximum contact stress deviates from the center under high pressure, which can easily lead to the uneven force on the friction contact surface and damage. A high-speed and high-pressure rotary shaft seal test device is designed. This paper introduces the composition and principle of the test device, designs the key parts of the test device, the control system and the inflatable device of high pressure gas source, and determines the size of the sealing ring for testing. High-speed and high-pressure wear performance tests were carried out. The influence of various factors on the test results was analyzed through the timing test of the test ring under the conditions of different rotational speed, different gas pressure and different O shape seal ring precompression shrinkage. The results show that the seal performance of the two test rings is not different at low pressure and low speed, but the seal performance of the gear slip ring combined seal is better under the condition of high pressure and high speed. Life test was carried out. Under the condition of 35MPa gas pressure and 1200rpm speed, the sealing life of two kinds of test rings was tested. The results show that under the condition of high speed and high pressure rotation, the seal life of the toothed slip-ring combined seal is 3 times longer than that of the square sliding ring. The experimental life of the toothed slip-ring combined seal ring is longer than that of the special rubber O-shaped seal ring used in practical work. Therefore, the toothed slip-ring combined seal ring can completely replace the existing sealing method. The application of the combined seal can greatly improve the reliability of the equipment and provide a test guarantee for the development and production of aerospace products.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB42;V423

【参考文献】