| Research on Sealing Performance of NBR O-shaped Sealing Ring Under Normal Temperature and High-Pressure Condition |
| Received:September 05, 2024 Revised:September 05, 2024 |
| DOI：10.12136/j.issn.1000-890X.2026.07.0483 |
| Key Words: O-shaped sealing ring；NBR；high-pressure condition；sealing performance；finite element analysis |
| Author Name | Affiliation | E-mail | | CAO Jinfeng* | Qingdao University of Technology | caojinfeng@qut.edu.cn | | MA Liyuan | Qingdao University of Technology | | | SHI Qingxiang | Qingdao University of Technology | | | LIU Xilong | Qingdao University of Technology | | | LIU Wenjie | Qingdao University of Technology | | | XU Ziwei | Qingdao University of Technology | |
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| Abstract: |
| 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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