Design and verification of end-face bidirectional self-sealing structure

LI Kaifu; GUAN Youliang; JIG Guotao; JIANG Quan; LIU Yunfan; JIAO Peng

doi:10.11993/j.issn.2096-3920.2025-0020

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LI Kaifu, GUAN Youliang, JIG Guotao, JIANG Quan, LIU Yunfan, JIAO Peng. Design and verification of end-face bidirectional self-sealing structure[J]. Journal of Unmanned Undersea Systems. doi: 10.11993/j.issn.2096-3920.2025-0020

Citation:

LI Kaifu, GUAN Youliang, JIG Guotao, JIANG Quan, LIU Yunfan, JIAO Peng. Design and verification of end-face bidirectional self-sealing structure[J]. Journal of Unmanned Undersea Systems. doi: 10.11993/j.issn.2096-3920.2025-0020

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Design and verification of end-face bidirectional self-sealing structure

doi: 10.11993/j.issn.2096-3920.2025-0020

LI Kaifu^1
,,
GUAN Youliang^{1
,
,},
JIG Guotao^1
,,
JIANG Quan^1
,,
LIU Yunfan^1
,,
JIAO Peng^2
,

1.
The 705 Research Institute, China Shipbuilding Industry Corporation, Kunming Yunnan 650032, China
2.
Institute of Advanced Equipment, Zhejiang university, Hangzhou 310027, China

Received Date: 2025-02-05
Accepted Date: 2025-03-24
Rev Recd Date: 2025-03-21

Available Online: 2025-09-12

Abstract

Abstract

In order to achieve the bidirectional sealing of the end face of underwater large-caliber hatch covers and solve the problem of large reaction force of the sealing ring during the closing process. Innovatively combining the good self-sealing advantage of the tongue-shaped cross-section and the anti-ejection structure of the dovetail structure, five specifications of "high-low tongue" bidirectional self-sealing rings were designed. The stress, deformation, contact pressure and other simulation analyses of the sealing rings were carried out using ABAQUS, and a prototype was trial-produced to conduct internal and external pressure sealing tests as well as loosening and tightening torque tests. The test results are consistent with the results of finite element analysis. The "high-low tongue" sealing ring can achieve bidirectional self-sealing of the end face under low reaction force. The larger the chamfer of the "tongue-shaped" structure, the higher the contact stress value between the sealing ring and the sealing surface, and the better the sealing effect; the smaller the difference in the height of the "tongue" on both sides of the sealing ring, the lower the height of the middle platform, and the easier it is for the sealing ring to be sucked out; reducing the maximum height and the middle platform height of the sealing ring can effectively reduce the sealing reaction force and extend the service life of the sealing ring. Based on the test results, the sealing ring was improved and optimized, and a large-caliber sealing ring was trial-produced. After closing and pressing the cover for more than a thousand times, it can still achieve self-sealing of internal air pressure, internal water pressure and external water pressure. The research results provide a reference for the design and application of end face sealing of large underwater pressure-bearing equipment.
- tongue seal ring,
- structural design,
- finite element analysis,
- sealing performance

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References(14)

References

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