化工学报 ›› 2020, Vol. 71 ›› Issue (S1): 346-354.doi: 10.11949/0438-1157.20191025

• 表面与界面工程 • 上一篇    下一篇

一种自适应柱状密封气膜特性分析

陆俊杰1(),张炜1(),谢方民2,焦永峰2   

  1. 1. 浙江大学宁波理工学院,浙江 宁波 315010
    2. 宁波伏尔肯科技股份有限公司,浙江 宁波 315010
  • 收稿日期:2019-09-12 修回日期:2020-01-23 出版日期:2020-04-25 发布日期:2020-05-22
  • 通讯作者: 张炜 E-mail:loveljj4566@163.com;zhangwei_nit@163.com
  • 作者简介:陆俊杰(1990—),男,博士,讲师,loveljj4566@163.com
  • 基金资助:
    国家自然科学基金项目(51905480);宁波“科技创新2025”重大专项(2018B10007);宁波市自然科学基金项目(2019A610161)

Performance analysis of gas film of adaptive cylindrical seal

Junjie LU1(),Wei ZHANG1(),Fangmin XIE2,Yongfeng JIAO2   

  1. 1. Zhejiang University Ningbo Institute of Technology, Ningbo 315010, Zhejiang, China
    2. Ningbo FLK Technology Co. , Ltd, Ningbo 315010, Zhejiang, China
  • Received:2019-09-12 Revised:2020-01-23 Online:2020-04-25 Published:2020-05-22
  • Contact: Wei ZHANG E-mail:loveljj4566@163.com;zhangwei_nit@163.com

摘要:

提出一种自适应柱状气膜密封,构建气膜-密封环为研究对象,考虑了偏心间隙发散问题,并定义Rayleigh台阶对气膜周期的突变性,建立了气膜雷诺方程和膜厚变化函数关系式的动力润滑数值模型,获得了摩擦副气膜润滑特性,研究结果表明:气膜力随转速和压力升高而增加,泄漏量随压力升高而增加但是随转速增加而下降,说明密封内部压力流占主导地位。随后,利用曲面槽型雕刻技术,结合高速试验台对密封进行测试,结果表明:理论计算模型与试验结果吻合度较高,斜槽区域存在更多擦痕与磨损,说明斜槽浮动性弱于直列槽;但斜槽的切向流动小于直列槽,导致斜槽泄漏量小于直列槽。该研究成果为自适应柱状气膜密封的气体流动规律和应用提供了理论基础。

关键词: 柱面, 微槽, 气膜, 润滑, 试验, 磨损

Abstract:

An adaptive cylindrical gas film seal is proposed. Consider the problem of eccentric gas film convergence and define the abrupt change of the Rayleigh step to the gas film cycle, the relationship between the Reynold equation and the film thickness function is established, and the lubrication characteristics of friction pair are obtained. The results show that the gas bearing force is increase with speed and pressure, the leakage increases with increasing pressure but decreases with increasing speed. It is thus concluded that the internal pressure flow of the seal is dominant. Subsequently, the curved groove engraving technique is proposed, and the experiment is carried out. The results show that there are obvious scratches and wear in the chute groove, and the gas bearing force of chute groove is weaker than the straight groove, but the leakage of chute groove is smaller than the straight groove. It shows that the tangential flow of the chute groove is smaller than that of the straight groove, which results in the leakage of the chute groove is smaller than that of the straight groove. At the same time, the theoretical calculation model is agreeing well with the experimental results. The research results lay a theoretical foundation for the application of adaptive cylindrical gas film seals.

Key words: cylinder, microgroove, gas film, lubrication, experiment, friction

中图分类号: 

  • TB 42

图1

自适应柱状气膜密封的结构示意图 1—轴;2—旋转环;3—定位销;4—弹簧;5—浮环;6—端盖;7—密封腔"

图2

自适应柱状气膜密封的几何模型"

图3

槽型结构示意图"

表1

自适应柱状气膜密封结构参数和气体参数"

Symbol Structure parameter Value Symbol Gas parameter Value
R outer radius of rotating ring 0.025 m T 0 ambient temperature 298 K
L length of floating ring 0.052 m pl ambient pressure 101325 Pa
C average film thickness 5×10-6 m μ 0 viscosity 1.8×10-5 Pa·s
ε eccentricity 0.6 ρ 0 density 1.1452 kg/m3
n r rotating speed 10000—50000 r/min p h gas pressure-in pressure 0—0.6 MPa

表2

槽型结构参数"

Groove number

Groove

depth

Groove

length

Groove

width

Spiral

angle

n c h c l c b c β
16 2×10-6 m 0.025 m 0.005 m 30, 90

图4

斜槽气膜压力分布"

图5

直列槽气膜压力分布"

图7

槽型受力简化图"

图6

气膜浮升力和泄漏量随转速变化规律"

图8

气膜力和泄漏量随压力变化规律"

图9

槽型雕刻与流程图"

图10

试验台示意图"

图11

表面擦痕图"

图12

斜槽与直列槽泄漏量随转速变化的试验值与理论值"

图13

斜槽与直列槽泄漏量随压力变化的试验值与理论值"

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