【作者】 邹波；

【导师】 邓斌； 于兰英；

【作者基本信息】 西南交通大学 ， 驱动技术与智能系统， 2008， 硕士

【摘要】 随着海洋开发活动的深入,深海电机作为水下设备的核心部件而得到广泛应用。深海电机的密封是普通电机用于深海需要解决的关键性问题,尤其是旋转轴的动密封,其性能的好坏直接影响到电机能否正常工作。根据电机工作水深范围的不同,本文将深海电机旋转动密封分为两类:承压型旋转动密封和压力补偿型旋转动密封。本文首先对用于承压型旋转动密封的机械密封性能进行了分析。利用ANSYS对密封环进行建模,分析了在轴向力和径向力作用下端面接触压力与密封环参数的关系,得出了接触压力随载荷系数、弹簧压力及介质压力增大而增大,其中介质压力的影响最明显。但介质压力为外界因素,因此在满足密封性能的条件下,尽量选取较小的载荷系数和弹簧压力。端面宽度的增大引起接触压力的减小,因此可适当增加端面的宽度。压力补偿型旋转动密封由于密封压力差小,可以利用O形密封圈及唇封等,关键的问题在于海水的巨大压力对它们的密封性能有什么具体影响。通过对O形密封圈的模拟计算,得出了海水压力对密封圈接触压力影响很小,其大小和分布与过盈量及密封介质压力差有关,并提出了在深海中使用时的设计要点。对深海设备的模拟测试研究非常重要。本文设计了高压试验舱以及相应旋转轴的唇形密封,为模拟深海的高压环境提供了条件。通过有限元计算及试验结果对唇形密封的初步设计提出了改进方法,这也为进一步对唇封在深海环境下密封性能的分析做了一定的准备。通过对两种类型深海电机密封接触压力的分析,从结果中我们直观地了解到设计参数对密封性能的影响,为深海环境中密封的设计提供了理论依据。更多还原

【Abstract】 With the exploitation going on in sea, the deep-sea motor which is the core part of underwater equipment is used widely. The seal of deep-sea motor is the key problem when the common motor works in deep-sea, especially the rotating shaft seal, its performance will have a direct impact on the motor’s working. According to the different working depth scope of motor, the shaft seal can be divided into two types in thesis: pressure rotating seal and pressure compensation rotating seal.Firstly, the performance of mechanical seals which used in pressure rotating seal was analyzed. The model of seal ring was accomplished with ANSYS software. With the radial and axial force, the relation between contact pressure and parameters of seal rings was discussed. The analysis results indicated that, the contact pressure increased as the load coefficient, spring pressure and medium pressure increasing, and the role of medium pressure is most obvious. Medium pressure is environment factor, so when the sealing performance satisfied, a smaller load coefficient and spring pressure should be choosed as possible. The contact pressure decreased as the end face width increasing, so the bigger one was a good choice.The sealing pressure of pressure compensation rotating seal was small, so O-rings and lip seals were used for this type seal. And the key problem consisted in how the tremendous pressure of water would impact on seals. Through the simulation of O-ring, the results indicated that seawater pressure had a little effect on the contact pressure of seal, its value and distribution related to the surplus and margin of medium pressure. Some suggestion was gave for design and use of O-ring working in deep-sea.The study on the simulation test is very important. High pressure vessel and rotating shaft lip seals were designed in this paper, and providing the condition of high-pressure simulation of deep-sea environment. The method of improving preliminary design lip seal was presented through finite element calculation and results of trial. Some preparation was done to the next further analysis of lip seal used in deep-sea. Through the analysis about contact pressure of the two type deep-sea motor seals, how the design parameters impacted on the performance of seal was presented intuitively. Some theoretical basis was supplied for the design of deep-sea seals.更多还原