| 常温高压工况下丁腈橡胶O形密封圈的密封性能研究 |
| Research on Sealing Performance of NBR O-shaped Sealing Ring Under Normal Temperature and High-Pressure Condition |
| 投稿时间：2024-09-05 修订日期：2024-09-05 |
| DOI：10.12136/j.issn.1000-890X.2026.07.0483 |
| 中文关键词: O形密封圈 丁腈橡胶 高压工况 密封性能 有限元分析 |
| 英文关键词: O-shaped sealing ring NBR high-pressure condition sealing performance finite element analysis |
| 基金项目:山东省重点研发计划（公益类专项）（2019GGX101020） |
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| 中文摘要: |
| 以常温高压（介质应力为80～180 MPa）工况下丁腈橡胶O形密封圈（简称O形密封圈）为研究对象，采用有限元分析方法，建立二维轴对称模型，研究介质应力、内圆角半径和密封间隙对O形密封圈的接触应力的影响。结果表明：随着介质应力的增大，O形密封圈的最大接触应力呈线性增大，且始终大于介质应力，密封性能满足要求；内圆角半径改变对O形密封圈的接触应力的影响较小，但当内圆角半径过小时在O形密封圈的密封沟槽处产生应力集中，影响O形密封圈的密封稳定性；密封间隙增大会降低O形密封圈的密封性能；改变内圆角半径和密封间隙会引起O形密封圈的最大接触应力位置改变。 |
| 英文摘要: |
| Taking the nitrile rubber（NBR） O-shaped sealing ring（referred to as O-shaped sealing ring） under normal temperature and high-pressure（80～180 MPa of medium stress） conditions as the research object，a two-dimensional axisymmetric model was established using finite element analysis method to investigate the effects of medium stress，inner fillet radius and sealing clearances on the contact stress of the O-shaped sealing ring.The results indicated that，as the medium stress increased，the maximum contact stress of the O-shaped sealing ring increased linearly and remained consistently higher than the medium stress，ensuring sealing performance met requirements.Altering the inner fillet radius had a minor impact on the contact stress of the O-shaped sealing ring，but when the inner fillet radius was too small，stress concentration occured at the sealing groove of the O-shaped sealing ring，affecting the sealing stability of the O-shaped sealing ring.Increasing the sealing clearance reduced the sealing performance of the O-shaped sealing ring.Changing the inner fillet radius and sealing clearances leaded to a shift in the location of the maximum contact stress.
Key words：O-shaped sealing ring；NBR；high-pressure condition；sealing performance；finite element analysisTaking the nitrile rubber（NBR） O-shaped sealing ring（referred to as O-shaped sealing ring） under normal temperature and high-pressure（80～180 MPa of medium stress） conditions as the research object，a two-dimensional axisymmetric model was established using finite element analysis method to investigate the effects of medium stress，inner fillet radius and sealing clearances on the contact stress of the O-shaped sealing ring.The results indicated that，as the medium stress increased，the maximum contact stress of the O-shaped sealing ring increased linearly and remained consistently higher than the medium stress，ensuring sealing performance met requirements.Altering the inner fillet radius had a minor impact on the contact stress of the O-shaped sealing ring，but when the inner fillet radius was too small，stress concentration occured at the sealing groove of the O-shaped sealing ring，affecting the sealing stability of the O-shaped sealing ring.Increasing the sealing clearance reduced the sealing performance of the O-shaped sealing ring.Changing the inner fillet radius and sealing clearances leaded to a shift in the location of the maximum contact stress. |
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