共查询到20条相似文献,搜索用时 93 毫秒
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密封端面温度不但影响端面变形也表征了端面的摩擦状态,对密封的运行至关重要,尤其是对于动压密封启停时的非开启状态。研究油气两相回流泵送密封(OG-BPS)在开启态和非开启态下的端面温度分布。在ANSYS Workbench中建立热-结构耦合数值分析模型并进行变工况参数试验,分析了转速、压差和液气比等工况参数对端面温度的影响。结果表明:在开启态下,端面温度随着转速和液气比的增加仅略有增加,因此OG-BPS在变工况条件下能够稳定可靠地工作;在未开启态下,端面温度随着转速和压差的增加而急剧增加,但随着液气比的增大,端面温度迅速下降,油气两相介质有利于启停运行。试验结果与数值计算结果相吻合,证明了数值计算的正确性。 相似文献
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核电泵用机械密封摩擦有限元分析 总被引:3,自引:2,他引:1
以不同工况下的机械密封环为研究对象,依据接触表面的温度,对各种工况时密封端面的接触状况及温度变化趋势进行了分析。结果表明:在极端工况下,机械密封环温度远低于相应材料的允许使用上限;在正常工况下,密封环由于摩擦生热引起的温升较小,由密封介质传导入密封环的热量引起的温升较大。机械密封在不同介质温度和不同密封压力下均可保证较好的运行性能。在极端工况下,密封动静环等效M ises应力均在较低的水平,不会导致密封环的失效破坏。由于密封压力作用引起的密封端面变形,密封端面液膜厚度沿压降方向呈发散分布;在端面外径处动静环将会产生局部接触磨损,密封介质温度对端面液膜厚度影响较小。 相似文献
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柴油加氢装置循环氢压缩机在停工维修过程中,机组干气密封系统非驱动端和驱动端密封气泄漏量和压力先后急剧上升,导致干气密封损坏。通过事故现象判断、密封件及辅助系统的拆解检查,发现失效原因是,未经处理含有大量液态物质的工艺介质直接进入密封腔和密封端面,造成端面间气膜不稳定、密封端面接触磨损严重。为此提出了增加电伴热系统,防止由于密封气温度较低产生凝液现象等方法,保证循环氢压缩机组长周期运行。 相似文献
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分析某装置反应器循环泵机械密封频繁泄漏量及端面温度高的原因。指出介质端密封载荷系数选择不当,导致密封端面比压偏小,是介质侧密封失效的主要原因;泵送环输送能力低,循环隔离液不能有效将密封摩擦热传递出去是导致大气侧端面温度高过高的主要原因。通过调整载荷系数和提高机械密封泵送能力,密封改造后使用寿命大幅提高,解决了循环泵机械密封频繁泄漏的问题。 相似文献
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The introduction of grooves, micropores, and other forms of surface geometric modifications onto the mating seal plates has been performed to enhance the gas face seal performance. Reducing fluid leakage through the seal surface has been the main motivation for the development of efficient sealing technology for industrial turbomachinery. Pressure dams are generally etched on the seal inner and outer radii to improve even more the seal capability of reducing the gas leakage to atmosphere. This paper presents a finite element analysis carried out to determine the opening force, the flow leakage and the dynamic force coefficients of flat gas face seals with pressure dams operating under stringent conditions. Several curves of steady-state and dynamic seal performance characteristics depict the influence of the pressure dam position and width on the seal performance and efficiency. 相似文献
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剖分式螺旋机械密封结构设计 总被引:1,自引:1,他引:0
水相悬浮压力法生产氯化聚乙烯反应条件为高温高压,且反应釜搅拌轴转速高,其旋转轴封存在易漏易损的缺点,故在结构设计上要求旋转轴密封性能好且易于维修更换。针对以上问题,结合螺旋密封与机械密封两者的结构特点,分析设计出一种新型的剖分式螺旋机械密封装置,能够达到较好的密封性能,且易于维修更换。 相似文献
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变速器壳体接合面密封性能有限元预测 总被引:1,自引:0,他引:1
建立了以变速器总成为单位的接合面密封性能有限元预测模型,应用接触有限元方法进行计算,得到了主箱-后盖接合面和主箱-盖板接合面在装配、一挡和倒挡时的密封性能参数。按照接合面密封性能判断方法,通过分析表明:主箱与盖板之间的密封垫上各处均有压应力存在,且形成了具有一定压力的密封压力环,主箱-后盖接合面密封性能良好;主箱-盖板接合面未形成密封压力环带,但其间隙变化和错移量均在一定范围内,满足硅胶力学性能要求,主箱-盖板接合面密封性能良好。该研究为分析评价垫片和胶密封接合面的密封性能提供了借鉴方法。 相似文献
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《机械工程学报(英文版)》2010,(5)
Finger seal is a new technology developed for gas path sealing in gas turbine engine.It has been paid attention to its good sealing performance and lower manufacture cost.The vibration behavior of finger seal is not be considered in performance analysis for the contact finger seal with compliant geometric configuration,then this will influence the reliability of the performance analysis and the parametric design of a finger seal.According to the dynamic character of finger seal,the harmonic vibration and free vibration models of a repetitive section of a two-layer finger seal that contains one high and one low finger seal are established separately.The dynamic behavior of finger seal in different working conditions is obtained based on the dynamic response analysis of finger's vibrations.The dynamic low hysteresis and low wear terms based on the equivalent dynamic model of finger seal are put forward,which can be used to predict the dynamic behavior of finger seal.As an example,the dynamic behaviors of an 8-layer finger seal and a 10-layer finger seal were predicted,and the validity of the prediction was demonstrated by the leakage test results of these two finger seals.The work presented here not only could make the dynamic analysis of finger seal with complicated structure simple and easy especially for multi-layer finger seal system,but also suggest a useful method for designing the finger seal with good dynamic behavior by means of different seal layers assembly. 相似文献
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机械密封泄漏是双螺杆压缩机运行过程中的主要故障之一,根据工艺介质的特点和相关理论,对双螺杆压缩机的机械密封结构和型式进行改进设计。利用现有辅助系统和保持现有机封基本结构,把具有"自清洁功能"的双列反向交叉槽型油膜非接触式机械密封应用到螺杆压缩机上,对其应用技术和性能进行了分析,解决了丁二烯螺杆压缩机轴封泄漏的问题。 相似文献
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为探明汽车发动机冷却泵在高负荷运转条件下,普遍存在的性能指标急速下滑,甚至失效的问题,采用CFD数值计算,研究冷却泵密封间隙大小对泵性能参数的影响。分别计算了完全密封、密封间隙分别为0.2mm,0.3mm及无密封条件下的外特性参数,并作了分析对比。计算结果表明,在密封完全失效的条件下,泵指标只能达到设计指标的60%,而在0.2mm间隙下,性能指标也已下降10%。考虑到冷却泵始终处于振动环境中运行,而通常的端面密封很难长时间保持有效。因此,提出一种屏蔽式的冷却泵,并初步进行了研究。 相似文献
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A numerical model was developed for a special type of metal-to-metal face seal to evaluate its performance under various operating conditions. The model considers interactions among surface deformations due to thermomechanical twists, oil transport in the sealing band, and heat transfer in the seal pair simultaneously. In the meantime, experimental efforts have been made to measure the friction coefficients and seal temperatures during different operations. The model predictions were then compared with the experiment results through the two above-mentioned quantities. The comparisons show that the numerical simulations consistently overestimate the friction by 15–20%. However, the overall trend of friction variation with speed and some details of the friction have been captured, indicating that the current models are able to properly predict tribology of seal operations. 相似文献