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不同槽型气体端面密封的研究 总被引:12,自引:1,他引:11
本文根据雷诺方程,编写了计算不同槽型气体端面密封端面压力分布的有限元程序。利用计算程序分别对三种不同槽型的密封面结构进行了优化,理论研究表明,斜底螺旋槽密封的性能最好,平底螺旋槽次之,但二者差别不大,径向槽密封的性能最差。 相似文献
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干式气体端面密封的研究现状 总被引:3,自引:0,他引:3
非接触式干式气体端面密封(DGS)是一种新型机械密封,在旋转机泵的转轴轴端密封装置中已经得到成功应用.对DGS的研究进展进行了总结,着重介绍了密封性能的理论分析与数值计算方法,端面微槽的优化设计方法,试验研究方法以及考虑端面微尺度效应和滑移流效应基础研究等方面的研究现状.指出在高参数条件下DGS端面的热流固耦合与解耦分析,低速或低压条件下密封的启动与停车性能的准确预测及结构优化是DGS技术未来研究的重点,也是进一步拓广DGS应用领域、提高其工作可靠性的关键. 相似文献
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采用直接数值模拟的方法联立求解螺旋槽气体端面密封的运动方程和动态雷诺方程,结合给定的密封参数条件,得到该螺旋槽气体端面密封的临界转速和临界转动惯量。在干气密封的设计和运行过程中,超过该临界值,系统将因失稳而导致泄漏。 相似文献
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端面密封结构的设计探讨 总被引:2,自引:2,他引:0
端面密封又称为机械密封.由于端面密封有许多优点,近年来在国内外已经得到了广泛的应用.端面密封的密封质量和使用寿命,是与转速.压力、温度.几何尺寸、环境、仲击振动、材料、加工质量、安装固定等许多因素有关,是一个较为复杂的问题.为了提高密封质量和使用寿命,需正确地设计摩擦副和端面密封的整体结构,同时在生产制造和安装过程中,保证必要的加工质量和安装精度.本文围绕端面密封整体结构的设计,提出一些探讨要点,供设计工作者参考. 相似文献
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非接触式气体端面密封低速性能试验研究 总被引:8,自引:1,他引:7
就一种非接触式气体端面密封进行了低速条件下的试验研究。试验表明,在低速下端面几何参数对密封性能有较大的影响。初步设计出了在低速条件下能够实现动、静压相结合的合理的密封结构形式。该密封气膜稳定,泄漏量小,摩擦系数低。同时,总结出了一些实现端面非接触稳定运转的必要条件。此项研究对于实现非接触气体端面密封的国产化及其应用具有一定的实用价值。 相似文献
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P-6201脱丁烷塔顶回流泵是中压加氢装置的关键设备,泵腔介质为轻烃,其中含有30%的硫化氢。硫化氢属于强烈的神经毒素,易燃、易爆,一旦大量泄漏到环境中,将带来极大的安全隐患。由于介质中硫化氢含量较高,在使用及检修拆泵时容易造成环境污染以及对操作人员造成伤害。P-6201采用的是单端接触式机械密封,使用寿命短。随着环保意识不断加强,对炼油装置的安全及可靠性要求越来越高。公司基于环保、安全、寿命等原因考虑,必须对这类高危泵进行改造。 相似文献
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分析了加氢密封的压缩机干气密封常见的损坏失效方式,通过实例分析了干气密封污染的原因,提出了干气密封的供气系统改进和结构改进,改进后压缩机运行良好.采取了重新加工轴承腔、建立逻辑控制系统及二级排放口开在密封腔上端等三种措施,解决了润滑油向干气密封的流动问题。提出了干气密封系统污染的预防措施。 相似文献
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串联式干气密封在循环氢压缩机组中的应用 总被引:1,自引:1,他引:0
针对离心式循环氢压缩机工艺特点,选择了适合该机组的带中间进气的串联式干气密封结构厦控制系统。进行了干气密封的设计、选材,并提出产品质量控制、检验标准。密封及系统设计获得成功,串联式带中间迷宫的干气密封在年产140万吨芳烃改造装置循环氢压缩机组首次运用获得成功,保证了循环氢压缩机组的稳定运行。 相似文献
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In working state, the dynamic performance of dry gas seal, generated by the rotating end face with spiral grooves, is determined by the open force of gas film and leakage flow rate. Generally, the open force and the leakage flow rate can be obtained by finite element method, computational fluid dynamics method and experimental measurement method. However, it will take much time to carry out the above measurements and calculations. In this paper, the approximate model of parallel grooves based on the narrow groove theory is used to establish the dynamic equations of the gas film for the purpose of obtaining the dynamic parameters of gas film. The nonlinear differential equations of gas film model are solved by Runge-Kutta method and shooting method. The numerical values of the pressure profiles, leakage flux and opening force on the seal surface are integrated, and then compared to experimental data for the reliability of the numerical simulation. The results show that the numerical simulation curves are in good agreement with experimental values. Furthermore, the opening force and the leakage flux are proved to be strongly correlated with the operating parameters. Then, the function-coupling method is introduced to analyze the numerical results to obtain the correlation formulae of the opening force and leakage flux respectively with the operating parameters, i.e., the inlet pressure and the rotating speed. This study intends to provide an effective way to predict the aerodynamic performance for designing and optimizing the groove styles in dry gas seal rapidly and accurately. 相似文献
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The dry gas seal(DGS) has been widely used in high parameters centrifugal compressor, but the intense vibrations of shafting,especially in high-speed condition, usually result in DGS's failure. So the DGS's ability of resisting outside interference has become a determining factor of the further development of centrifugal compressor. However, the systematic researches of which about gas film disturbance characteristics of high parameters DGS are very little. In order to study gas film disturbance characteristics of high-speed and high-pressure spiral groove dry gas seal(S-DGS) with a flexibly mounted stator, rotor axial runout and misalignment are taken into consideration, and the finite difference method and analytical method are used to analyze the influence of gas film thickness disturbance on sealing performance parameters, what's more, the effects of many key factors on gas film thickness disturbance are systematically investigated. The results show that, when sealed pressure is 10.1MPa and seal face average linear velocity is 107.3 m/s, gas film thickness disturbance has a significant effect on leakage rate, but has relatively litter effect on open force; Excessively large excitation amplitude or excessively high excitation frequency can lead to severe gas film thickness disturbance; And it is beneficial to assure a smaller gas film thickness disturbance when the stator material density is between 3.1 g/cm~3 to 8.4 g/cm~3; Ensuring sealing performance while minimizing support axial stiffness and support axial damping can help to improve dynamic tracking property of dry gas seal. The proposed research provides the instruction to optimize dynamic tracking property of the DGS. 相似文献
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干气密封技术在离心式压缩机等高速流体机械上获得了广泛应用,在泵、反应釜等低转速设备上的应用开始引起重视.综述了国内外泵用干气密封技术及其应用现状,介绍了泵用干气密封的技术特点,包括结构形式、布置方式、端面槽型等,并介绍了成功应用于石化行业的典型案例.同时介绍了主要密封公司典型泵用干气密封产品的技术特点. 相似文献
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基于Fluent的螺旋槽干气密封数值模拟与分析 总被引:1,自引:0,他引:1
笔者从计算流体力学出发,使用GAMBIT对模型进行网格划分,用世界著名的CFD软件Fluent对螺旋槽干气密封进行了数值模拟分析,并与权威的试验值进行比较,验证了所用方法在螺旋槽干气密封研究中应用的可行性和可信性。 相似文献