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针对H_2S风机密封的要求,分析对比了骨架密封、机械密封、抽气密封、充气密封的优缺点,设计了一种新型三瓣环碳环密封 抽气密封 充气密封的组合密封。 相似文献
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介绍了大功率特种离心泵的瞬态工作特性,分析了离心泵中旋转主轴密封系统的特殊性能要求。以特殊工作需要为依据,探讨了几种可能被采用的传统和新型密封型式,介绍了填料密封、机械密封、浮环密封、螺旋密封和磁流体密封的工作原理、性能特点和适用范围。根据密封装置工作条件的特殊性和各种密封的性能和结构特点,设计了适合于瞬态工作离心泵的组合密封结构形式,并对该组合密封的适用性进行了分析。 相似文献
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运用流体力学计算分析传统间隙密封结构应用于高速重载轴承座的可行性。研究发现,当密封盘以工作转速2 000 r/min工作时,传统间隙密封能够实现完全密封所需的最大密封间隙宽度为0.556 mm,使用条件苛刻。对传统间隙密封结构进行了改进,增大了间隙密封结构的密封间隙,并在密封盘第一阶凸台上增设了数个气压孔。计算及分析结果表明,改进后的间隙密封结构在密封盘以工作转速2 000 r/min工作时,能够实现完全密封所需的最大密封间隙宽度可达1 mm以上,改善了间隙密封结构的使用条件。实验证明了改进的间隙密封结构能够实现高速重载轴承座的完全密封。 相似文献
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The current research on secondary O-ring seals used in mechanical seals has begun to focus on their dynamic properties. However, detailed analysis of the dynamic properties of O-ring seals in spiral groove gas face seals is lacking. In particular a transient study and a difference analysis of steady-state and transient performance are imperative. In this paper, a case study is performed to gauge the effect of secondary O-ring seals on the dynamic behavior (steady-state performance and transient performance) of face seals. A numerical finite element method (FEM) model is developed for the dynamic analysis of spiral groove gas face seals with a flexibly mounted stator in the axial and angular modes. The rotor tilt angle, static stator tilt angle and O-ring damping are selected to investigate the effect of O-ring seals on face seals during stable running operation. The results show that the angular factor can be ignored to save time in the simulation under small damping or undamped conditions. However, large O-ring damping has an enormous effect on the angular phase difference of mated rings, affecting the steady-state performance of face seals and largely increasing the possibility of face contact that reduces the service life of face seals. A pressure drop fluctuation is carried out to analyze the effect of O-ring seals on the transient performance of face seals. The results show that face seals could remain stable without support stiffness and O-ring damping during normal stable operation but may enter a large-leakage state when confronting instantaneous fluctuations. The oscillation-amplitude shortening effect of O-ring damping on the axial mode is much greater than that on the angular modes and O-ring damping prefers to cater for axial motion at the cost of angular motion. This research proposes a detailed dynamic-property study of O-ring seals in spiral groove gas face seals, to assist in the design of face seals. 相似文献
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深冷泵多采用进口多弹簧串联机械密封,但价格高、供货周期长。对深冷泵用机械密封进行了国产化研究,所研制的机械密封实现了要求工况下平稳、长周期的运行。 相似文献
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针对宝钢炼钢焙烧回转窑煤气升压风机工作中机械密封泄漏量大、磨损快、寿命短的问题,对其进行了分析改造,采用CDSA^TM集装式机械密封,保证了设备的正常运行。 相似文献
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Large, bakeable, rotatable ultrahigh vacuum seals capable of operation at 10(-11) Torr are described. They employ doubly differentially pumped commercially available spring-loaded Teflon seals. A static version is very convenient for quick access as it requires nearly negligible sealing force other than atmospheric force. 相似文献
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INVESTIGATION INTO EFFECT OF SPRING PRESSURE ON PERFORMANCE OF BALANCED MECHANICAL SEALS 总被引:2,自引:0,他引:2
SUN Jianjun GU Boqin College of Mechanical Power Engineering Nanjing University of Technology Nanjing China 《机械工程学报(英文版)》2007,20(3):39-43
The loads acting on the sealing elements of balanced mechanical seals are analyzed. When the balance factor approaches the back pressure factor, the spring pressure will become main part of the face pressure. The leakage model of balanced mechanical seals is established on the base of M-B model for rough surface. Several GY-70 type balanced mechanical seals are tested. The influences of the spring pressure both on the leakage rate and on the friction characteristic of balanced mechanical seals are investigated. The research results indicate that as spring pressure increases, both the clear-ance between two end faces and the leakage rate will decrease, and the friction will be more serious because lubrication medium between the rotating ring and the stationary ring reduces, though the increase of the spring pressure may not be enough to change the face friction state of mechanical seals. There exists an optimum spring pressure for mechanical seal operation. Under this spring pres-sure, not only leakage rate is small, but also the seal end surfaces have a fine friction characteristic. Under different operating conditions, identical type mechanical seals may possess different spring pressure. Appropriate selection of spring pressure is valuable to realize long-period and small leakage rate operating of balanced mechanical seals. 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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数值研究相同条件下迷宫气封和薄叶气封结构特点、气动特性、密封机理及密封效果,比较两种气封的差异。通过与已发表的试验数据的对比,校核所采用的商业计算流体力学软件CFX的可靠性,计算得到的性能曲线与试验数据有较好的一致性,采用的数值模拟方法可行。分别对迷宫气封和薄叶气封内部流场进行数值模拟。通过对两种气封计算结果的对比分析,阐明它们的密封机理,给出各自的封严特性和所产生的摩擦转矩的变化规律。分析结果表明,薄叶气封的径向间隙远小于迷宫气封,漏气量为迷宫气封的1/3,对旋转轴产生的摩擦阻抗力矩低于迷宫气封,从结构运行特点和气动性能两方面说明薄叶气封的优越性,认为在不久的将来薄叶气封有可能替代迷宫气封。 相似文献