轴间气膜密封周向相对滑动判定方法

黄玉辉; 苏华; 程卓一; 侯国强

doi:10.13700/j.bh.1001-5965.2020.0366

轴间气膜密封周向相对滑动判定方法

doi: 10.13700/j.bh.1001-5965.2020.0366

西北工业大学机电学院, 西安 710072

基金项目:

国家自然科学基金 51575445

详细信息

通讯作者:
苏华, E-mail: huasu@nwpu.edu.cn

中图分类号: V232;TH122
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- 文章访问数: 284
- HTML全文浏览量: 19
- PDF下载量: 150
- 被引次数: 0
出版历程
- 收稿日期: 2020-07-28
- 录用日期: 2020-10-30
- 网络出版日期: 2021-10-20

Judgment method of circumferential relative sliding of air film seal between shafts

School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, China

Funds:

National Natural Science Foundation of China 51575445

More Information

Corresponding author: SU Hua, E-mail: huasu@nwpu.edu.cn

摘要

摘要:
为预判端面轴间气膜密封中密封环与外层转子之间是否产生周向相对滑动，提出了一种考虑离心膨胀效应的轴间气膜密封周向相对滑动判定方法。分析了密封环与外层转子之间产生周向相对滑动的力学机制，将密封环和外层转子离心膨胀简化为轴对称平面应力问题和轴对称平面应变问题。计算了密封环和外层转子的弹性变形刚度差异对膨胀变形及连接关系的影响，得到了密封环与外层转子产生临界滑动的工况区域。所提判定方法对工程中密封环的周向滑动问题提供了预测及指导。
- 离心膨胀 /
- 弹性变形 /
- 周向滑动 /
- 临界滑动转速 /
- 轴间密封
Abstract:
In order to predict whether there is relative sliding in the circumferential direction between the seal ring and the outer rotor in air film seal between shafts, a method for determining the circumferential sliding of air film seal between shafts considering centrifugal expansion effect is proposed. The mechanical mechanism of the circumferential sliding between seal ring and outer rotor is analyzed. The centrifugal expansion of seal ring and outer rotor is simplified into axisymmetric plane stress and axisymmetric plane strain. The influence of the difference of elastic deformation stiffness between seal ring and outer rotor on the expansion deformation and the connection relationship is calculated, and the critical sliding operating area between seal ring and rotor is obtained. The research method provides a prediction and guidance method for circumferential sliding of seal ring in engineering.
- centrifugal expansion /
- elastic deformation /
- circumferential sliding /
- critical sliding speed /
- shaft seal

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图 1 轴间密封结构示意图

Figure 1. Schematic of seal structure between shafts

下载: 全尺寸图片幻灯片

图 2 密封环

Figure 2. Seal ring

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图 3 密封环弹性模量和泊松比小于外层转子时套装面上径向膨胀变形

Figure 3. Radial expansion deformation on the sleeve surface when elastic modulus and Poisson's ratio of seal ring are smaller than outer rotor

下载: 全尺寸图片幻灯片

图 4 密封环弹性模量和泊松比大于外层转子时套装面上径向膨胀变形

Figure 4. Radial expansion deformation on sleeve surface when elastic modulus and Poisson's ratio of seal ring are larger than outer rotor

下载: 全尺寸图片幻灯片

图 5 密封环和外层转子材料性能相同时套装面上径向膨胀变形

Figure 5. Radial expansion deformation on sleeve surface with the same material properties of seal ring and outer rotor

下载: 全尺寸图片幻灯片

图 6 转子与轴承套装面径向膨胀变形比较^[18]

Figure 6. Comparison of radial expansion deformation of rotor and bearing on sleeve surface^[18]

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图 7 外层转子角加速度与临界滑动转速的关系

Figure 7. Relationship between angular acceleration of outer rotor and critical sliding speed

下载: 全尺寸图片幻灯片

表 1 密封环参数

Table 1. Parameters of seal ring

参数	符号
摩擦因数	μ
密封环宽度	B
无旋转时密封环外边界上的正压力	p
旋转时密封环外边界上的正压力	p_e
密封环的转动惯量	J
外层转子在ω角速度时的瞬时角加速度	α
密封环外半径	r₂
密封环内半径	r₁
密封环外圆周面积	S
密封环质量	m
最大静摩擦力与滑动摩擦力之间的比例系数	K
外层转子内半径	R₁
外层转子外半径	R₂

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表 2 计算参数(部分几何参数与图 1对应)

Table 2. Computational parameters(refer to Fig. 1)

参数	数值
摩擦因数μ	0.15
密封环外半径r₂/mm	76
密封环内半径r₁/mm	69
密封环宽度B/mm	10
外层转子最高转速n/(r·min^-1)	18 000
外层转子角加速度α/(rad·s^-2)	188.5
外层转子外半径R₂/mm	82
外层转子内半径R₁/mm	76

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表 3 材料性能参数一

Table 3. Material property parameters Ⅰ

参数	数值
密封环弹性模量E₁/GPa	14
密封环泊松比ν₁	0.25
密封环密度ρ₁/(g·cm^-3)	1.8
外层转子弹性模量E₂/GPa	209
外层转子泊松比ν₂	0.3
外层转子密度ρ₂/(g·cm^-3)	7.85

下载: 导出CSV

表 4 材料性能参数二

Table 4. Material property parameters Ⅱ

参数	数值
密封环弹性模量E₁/GPa	209
密封环泊松比ν₁	0.3
密封环密度ρ₁/(g·cm^-3)	7.85
外层转子弹性模量E₂/GPa	14
外层转子泊松比ν₂	0.25
外层转子密度ρ₂/(g·cm^-3)	1.8

下载: 导出CSV

表 5 材料性能参数三

Table 5. Material property parameters Ⅲ

参数	数值
密封环弹性模量E₁/GPa	209
密封环泊松比ν₁	0.3
密封环密度ρ₁/(g·cm^-3)	7.85
外层转子弹性模量E₂/GPa	209
外层转子泊松比ν₂	0.3
外层转子密度ρ₂/(g·cm^-3)	7.85

下载: 导出CSV

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