Design and Performance Analysis of a New Non-contact Self-impact Seal

doi:10.3901/JME.2023.15.204

Abstract

Abstract: Introducing blocking fluid to implement sealing function is a basic form of non-contact sealing. Low throttling efficiency is the key problem that restricts the performance improvement and system simplification of this kind of technology. By virtue of its unique shape structure,Tesla valve has high throttling efficiency and ingenious section by section impact blocking characteristic formed when reverse flow occurs. Based on this structure,a new type of non-contact self-impact sealing structure is proposed, which has the characteristics of zero wear, high stability, simple structure and high throttling efficiency. CFD technology is used to simulate the performance of the new seal under different structures and working parameters. Results show that:Compared with the horizontal and stepped self-impact sealing structures, the cascade structure has higher efficiency of series arrangement, and the best leakage suppression effect is achieved when the AbBa type combination and the staggered ratio k=2. The leakage of the new seal to hydrogen, methane and other low-density gas is higher, but the leakage of other high-density gas is basically unchanged. The leakage of the new seal is greatly affected by pressure and less affected by rotation speed, so the leakage can be effectively suppressed by reducing the sealing spacing and increasing the sealing series. Under the same working conditions, the new seal can reduce the leakage by 27.79%, 53.33% and 64.34%, respectively, compared with labyrinth, spiral and clearance seals. The sealing spacing is taken as the indicator, the new seal to achieve standard leakage seal spacing is more than ten times or even dozens of times dry gas seal, and the new seal spacing is rigid gap, higher stability. The proposed new seal structure will derive a new mechanical seal theory and original technology, which can realize the theoretical expansion and technical innovation of the existing non-contact seal system.

Key words: seal, non-contact, Tesla valve, self-impact, structure design, performance analysis

CLC Number:

TH117

WANG Yan, XIE Xuefei, XU Hui, HAUNG Zhouxin, HE Yiming, YANG Huaishi, HU Qiong. Design and Performance Analysis of a New Non-contact Self-impact Seal[J]. Journal of Mechanical Engineering, 2023, 59(15): 204-215.

References

[1] American Petroleum Institute. API Standard 682-2014. Pumps-shaft sealing systems for centrifugal and rotary pumps (Fourth Edition)[S]. Washington:API,2014.
[2] 何强,黄伟峰,胡广阳,等. 航空发动机气膜密封技术的发展[J]. 航空发动机,2021,47(4):106-113. HE Qiang,HAUNG Weifeng,HU Guangyang,et al. Development of air membrane seal technology in aero-engine[J]. Avicaeroengine,2021,47(4):106-113.
[3] DAWID Z,PIOTRR K,PIOTR K,et al. Performance of the honeycomb type sealings in organic vapour microturbines[J]. Energy,2021,226:120242.
[4] 吴鲁纪,李坤龙. 高速齿轮箱迷宫密封发展研究[J]. 工程机械,2021,52(12):89-96. WU Luji,LI Kunlong. Study on the development of high-speed speed speed maze[J]. Construction Machinery and Equipment,2021,52(12):89-96.
[5] 黎义斌,李建忠,白小榜. 基于摩擦因数的螺旋密封性能影响因素分析[J]. 排灌机械工程学报,2020,38(11):1131-1137. LI Yibin,LI Jianzhong,BAI Xiaobang. Friction factor-based analysis of influence factors of spiral-grooved seal on performance[J]. Journal of Drainage and Irrigation Machinery Engineering,2020,38(11):1131-1137.
[6] ZHOU X J,CHEN C L,LI J H,et al. Study on radial clearance sealing performance of graphite ring[J]. Journal of Pressure Vessel Technology,2021,143(3):031703-031711.
[7] 王衍,胡琼,肖业祥,等. 超高速干气密封扰流效应及抑扰机制研究[J]. 航空学报,2019,40(10):116-125. WANG Yan,HU Qiong,XIAO Yexiang,et al. Study on the disturbance effect and disturbance suppression mechanism of ultra-high speed dry gas seal[J].Acta Aeronautica et Astronautica Sinica,2019,40(10):116-125.
[8] 智冬,李双喜,张秋翔,等. 连续注排式气体离心密封的性能分析[J]. 润滑与密封,2012,37(2):40-44. ZHI Dong,LI Shuangxi,ZHANG Qiuxiang,et al. Performance analysis of continuous injection type gas centrifugal seal[J]. Lubrication Engineering,2012,37(2):40-44.
[9] BAI S X,HAO J L,YANG J,et al. Gas-liquid mass transfer behavior of upstream pumping mechanical face seals[J]. Materials,2022,15(4):1482.
[10] 张彤,李德才,李艳文. 磁性液体密封与迷宫密封组合密封的结构设计及优化[J]. 机械工程学报,2022,58(9):172-181. ZHANG Tong,LI Decai,LI Yanwen. Structural design and optimization of magnetic liquid seal and labyrinth seal seal[J]. Journal of Mechanical Engineering,2022,58(9):172-181.
[11] NIKOLA T. Valvular conduit:US1329559[P].1920-02-03.
[12] THOMPSON S M,MA H B,WILSON C. Investigation of a flat-plate oscillating heat pipe with Tesla-type check valves[J]. Experimental Thermal and Fluid,2011,35:1265-1273.
[13] WANG C T,CHEN Y M,HONG P A,et al. Tesla valves in micromixers[J]. International Journal of Chemical Reactor Engineering,2014,12(1):397-403.
[14] VRIES S,FLOREA D,HOMBURG F,et al. Design and operation of a Tesla-type valve for pulsating heat pipes[J]. International Journal of Heat & Mass Transfer,2017,105:1-11.
[15] QIAN J Y,CHEN M R,GAO Z X,et al. Mach number and energy loss analysis inside multi-stage Tesla valves for hydrogen decompression[J]. Energy,2019,179:647-654.
[16] WAHIDI T,CHANDAVAR R A,YADAV A K. Stability enhancement of supercritical CO₂ based natural circulation loop using a modified Tesla valve[J]. Journal of Supercritical Fluids,2020,166:105020.
[17] MONIKA K,CHAKRABORTY C,ROY S,et al. A numerical analysis on multi-stage Tesla valve based cold plate for cooling of pouch type Li-ion batteries[J]. International Journal of Heat and Mass Transfer,2021,177:121560.
[18] SHI H H,CAO Y,ZENG Y N,et al. Wearable tesla valve-based sweat collection device for sweat colorimetric analysis[J]. Talanta,2022(240):123208.
[19] 周润中,乔宇杰,张钰翔. 特斯拉阀性能的仿真研究[J]. 物理实验,2020,40(9):44-50. ZHOU Runzhong,QIAO Yujie,ZHANG Yuxiang. Simulation study om performance of Tesla valve[J]. Physical Experiment,2020,40(9):44-50.
[20] 杨哲,郗大来,李宁,等. 微通道结构数值模拟及实验性能评价[J]. 化工进展,2021,40(1):39-47. YANG Zhe,XI Dalai,LI Ning,et al. Numerical simulation and experiment performance evaluation of microchannel structure[J]. Chemical Industry and Engineering Progress,2021,40(1):39-47.
[21] 翁祥宇,严生虎,张跃,等. 一种基于特斯拉阀结构的微混合器设计、模拟及其试验研究[J]. 化工进展,2021,40(8):4173-4178. WENG Xiangyu,YAN Shenghu,ZHANG Yue,et al. Design,simulation and experiment study of a micro mixer based on Tesla valve structure[J]. Chemical Industry and Engineering Progress,2021,40(8):4173-4178.
[22] 徐晶磊,马晖扬,黄于宁. 反映强流动曲率效应的非线性湍流模型[J]. 应用数学和力学,2008,29(1):27-37. XU Jinglei,MA Huiyang,HUANG Yuning. Nonlinear turbulence model reflecting strong flow curvature effect[J]. Applied Mathematics and Mechanics,2008,29(1):27-37.
[23] GAMBOA A R,MORRIS C J,FORSTER F K. Improvements in fixed-valve micropump performance through shape optimization of valves[J]. Journal of Fluids Engineering,2005,127(2):339-346.
[24] QIAN J Y,WU J Y,GAO Z X,et al. Hydrogen decompression analysis by multi-stage Tesla valves for hydrogen fuel cell[J]. International Journal of Hydrogen Energy,2019,44(26):13666-13674.
[25] QINA J Y,CHEN M R,GAO Z X,et al. Mach number and energy loss analysis inside multi-stage Tesla valves for hydrogen decompression[J]. Energy,2019,179:647-654.
[26] JB/T 11289-2012. 干气密封技术条件[S]. 北京:机械工业出版社,2012. JB/T 11289-2012. Dry gas seal technical strip[S]. Beijing:China Machine Press,2012.
[27] 孙开元,郝振洁. 机械密封结构图例及应用[M]. 北京:化学工业出版社,2019. SUN Kaiyuan,HAO Zhenjie. Mechanical seal structure legend and application[M]. Beijing:Chemical Industrial Press,2019.
[28] 肖芳,王亚洲,刁安娜,等. 基于FLUENT技术迷宫密封的结构优化[J]. 流体机械,2013,41(9):29-32. XIAO Fang,WANG Yazhou,DIAO Anna,et al. Structural optimization design of labyrinth seal based on software FLUENT[J]. Fluid Machinery,2013,41(9):29-32.
[29] 任朝晖,魏杰涛,李永超,等. 螺旋密封的密封能力及参数优化[J]. 东北大学学报,2016,37(12):1755-1758. REN Zhaohui,WEI Jietao,LI Yongchao,et al. Sealing capability and parameter optimization of screw seal[J]. Journal of Northeastern University,2016,37(12):1755-1758.