非接触式高速机械密封脱开转速模型及实验

王俊倩; 张国渊; 赵洋洋; 赵伟刚; 陈宇

doi:10.13224/j.cnki.jasp.20240249

非接触式高速机械密封脱开转速模型及实验

doi: 10.13224/j.cnki.jasp.20240249

王俊倩^1,,
张国渊^1,*, ,,
赵洋洋¹,
赵伟刚²,
陈宇¹

1.
西安电子科技大学机电工程学院，西安 710071
2.
中国航天科技集团有限公司西安航天动力研究所，西安 710100

基金项目: 国家自然科学基金（52075407）

详细信息

作者简介:
王俊倩（2000-），男，硕士生，主要从事热流固耦合仿真分析。E-mail：wjq17835728836@163.com

通讯作者:
张国渊（1979-），男，教授、博士生导师，博士，主要从事摩擦学、旋转机械动力学研究。E-mail：gyzhang@xidian.edu.cn

中图分类号: V434⁺.21
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- 被引次数: 0
出版历程
- 收稿日期: 2024-04-24
- 网络出版日期: 2024-10-27

Separation speed model and experiment of non-contact high-speed mechanical seal

1.
School of Mechano-Electronic Engineering，Xidian University，Xi’an 710071，China
2.
Xi’an Aerospace Propulsion Institute，China Aerospace Science and Technology Corporation，Xi’an 710100，China

摘要

摘要:
针对某高速涡轮泵轴端动静结合型非接触式机械密封，提出了一类描述其端面接触状态机理的脱开转速新模型；分析了被密封介质属性、密封压差以及槽型结构参数等对脱开转速的影响规律。基于提出的模型建立了两类特定端面结构机械密封脱开模型，所得脱开转速与实验以及文献结果进行对比，相对误差分别为2.96%与4.1%；研究发现，进口压力与密封介质黏度越大，脱开转速越小；随螺旋槽槽深增加，脱开转速先减小后增大，最小脱开转速对应的槽深与液膜厚度一致；随螺旋槽台槽比增加，脱开转速增大；随螺旋角增大，脱开转速先减小后增大。研究对于阐述非接触式机械密封的脱开转变机理和设计高性能密封具有重要的理论和实践价值。
- 机械密封 /
- 接触状态转变 /
- 流体惯性效应 /
- 脱开转速 /
- 高速涡轮泵
Abstract:
Considering a high-speed turbopump shaft end hydrodynamic non-contact mechanical seal, a new model of separation speed describing the contact state mechanism of the end face was proposed. The influences of the properties of the sealing medium, sealing pressure difference, and groove structure parameters on the separation speed were analyzed. Based on the proposed model, two types of separation sub-models for the mechanical seal with specific end face structures were established. The obtained separation speed was compared with the experimental and literature results, and the relative error was 2.96% and 4.1%. The results showed that the higher inlet pressure and viscosity of the sealing medium indicated the lower separation speed. With the increasing depth of the spiral groove, the separation speed decreased first and then increased, and the groove depth corresponding to the minimum separation speed was consistent with the thickness of the fluid film. The separation speed increased with the spiral groove ratio. As the helix angle increased, the separation speed decreased initially and then rose. The study has important theoretical and practical value for elucidating the separation transformation mechanics of non-contact mechanical seals and designing high-performance seals.
- mechanical seal /
- contact state transition /
- fluid inertia effect /
- separation speed /
- high-speed turbopump

HTML

图 1 3种函数曲线图

Figure 1. Graphs of three functions

下载: 全尺寸图片幻灯片

图 2 组合螺旋槽机械密封动环的端面结构

Figure 2. End face structure of combined spiral groove mechanical seal dynamic ring

下载: 全尺寸图片幻灯片

图 3 组合螺旋槽机械密封脱开表达

Figure 3. Separation expression of combined spiral groove mechanical seal

下载: 全尺寸图片幻灯片

图 4 密封系统总功率随转速的变化^[10]

Figure 4. Change of total power of sealing system with the rotational speed^[10]

下载: 全尺寸图片幻灯片

图 5 组合螺旋槽机械密封在不同转速下的压力分布

Figure 5. Pressure distribution of combined spiral groove mechanical seal at different speeds

下载: 全尺寸图片幻灯片

图 6 人字槽端面机械密封动环的端面结构

Figure 6. End face structure of herringbone groove end face mechanical seal dynamic ring

下载: 全尺寸图片幻灯片

图 7 人字槽端面机械密封脱开表达

Figure 7. Separation expression of herringbone groove end face mechanical seal

下载: 全尺寸图片幻灯片

图 8 人字槽端面机械密封在不同转速下的压力分布

Figure 8. Pressure distribution of herringbone groove end face mechanical seal at different speeds

下载: 全尺寸图片幻灯片

图 9 不同工况参数对脱开转速的影响规律

Figure 9. Change of separation speed with the different working condition parameters

下载: 全尺寸图片幻灯片

图 10 不同槽结构参数对脱开转速的影响规律

Figure 10. Change of separation speed with the different groove structure parameters

下载: 全尺寸图片幻灯片

表 1 组合螺旋槽机械密封主要参数

Table 1. Main parameters of combined spiral groove mechanical seal

参数	数值
动环内径R_i/mm	45.5
动环外径R_o/mm	55.5
密封坝外径R_d,o/mm	51
密封坝内径R_d,i/mm	49
人字槽中心半径R_h,c/mm	47.4
槽数	30
槽深h_g/μm	3
螺旋槽螺旋角α/（°）	20
台槽比γ	1
动环转动惯量I/10⁻⁴ （kg·m²）	6.25
密封环角刚度k/（（N·m）/rad）	266.7
弹簧补偿力F_s/N	226.176
外压p_o/MPa	1
内压p_i/MPa	0.1

下载: 导出CSV

表 2 人字槽端面机械密封主要参数

Table 2. Main parameters of herringbone groove end face mechanical seal

参数	数值
动环内径R_i/mm	46.25
动环外径R_o/mm	55.25
密封坝内径R_d,i/mm	53.25
人字槽中心半径R_h,c/mm	51.25
槽数	28
槽深h_g/μm	10
螺旋槽螺旋角α/（°）	20
台槽比γ	1
动环转动惯量I/10⁻⁴ （kg·m²）	2.5
密封环角刚度k/（（N·m）/rad）	154.373
弹簧比压p_sp/MPa	0.15
外压p_o/MPa	2
内压p_i/MPa	0.1

下载: 导出CSV

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