Influence of mechanical sealing surface shape of marine stern shaft on sealing performance

ZHOU Xu-hui; LIU Zheng-lin; MENG Xiang-kun; LIU Jiao

doi:10.19818/j.cnki.1671-1637.2016.01.012

Volume 16 Issue 1

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ZHOU Xu-hui, LIU Zheng-lin, MENG Xiang-kun, LIU Jiao. Influence of mechanical sealing surface shape of marine stern shaft on sealing performance[J]. Journal of Traffic and Transportation Engineering, 2016, 16(1): 95-102. doi: 10.19818/j.cnki.1671-1637.2016.01.012

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ZHOU Xu-hui, LIU Zheng-lin, MENG Xiang-kun, LIU Jiao. Influence of mechanical sealing surface shape of marine stern shaft on sealing performance[J]. Journal of Traffic and Transportation Engineering, 2016, 16(1): 95-102. doi: 10.19818/j.cnki.1671-1637.2016.01.012

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Influence of mechanical sealing surface shape of marine stern shaft on sealing performance

doi: 10.19818/j.cnki.1671-1637.2016.01.012

School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, Hubei, China

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Author Bio:
ZHOU Xu-hui (1978-), male, doctoral student, +86-27-51239638, zhou719303@163.com

LIU Zheng-lin (1949-), male, professor, +86-27-86551600, zlliu812@163.com
Received Date: 2015-10-07
Publish Date: 2016-02-25

Abstract

Abstract

In allusion to the unstable performance of marine stern shaft mechanical seal caused by the factors such as marine shaft axis bending, shaft misalignment, the wear of stern bearing, the force of propeller, etc., the influence laws of both spherical and planar sealing surface shapes on sealing performance were researched by using both empirical formula and ANSYS finite element method.When water depths are 200, 400, 600 m, the thermal-structural coupling models of both spherical and planar sealing surface were established respectively.The contact areas, the leakage rates, the seal criterias, and the friction powers of unit area were compared, and the influence laws of both spherical and planar sealing surface shapes on the key parameters such as deformation, contact pressure, and temperature, etc., were discussed.Analysis result shows that under the same water depth, the clearance region and the maximum clearance of spherical seal are less than the values of planar seal.Compared to planar seal, the contact pressure of spherical seal changes more smoothly, and the maximum contact pressure of spherical seal is only 40%-50% of the pressure of planar seal. With the increasing of water depth, the contactpressure, temperature, and deformation of the two kinds of sealing surfaces increase, the contact region of sealing surface decrease, the clearance region extends gradually.When water depth increases from 200 m to 600 m, the contact node number of spherical seal decreases from 10 to 6, and the number of planar seal decreases from 7 to 4.When water depth is 200 m, the maximum temperature of spherical sealing surface is 5.499℃ lower than the value of planar sealing surface.The contact area, leakage rate, seal criteria, and the friction power of unit area of spherical seal are all better than the parameters of planar seal, so the spherical seal can improve the mechanical sealing performance of marine stern shaft.
- marine stern shaft,
- mechanical sealing surface,
- finite element method,
- planar seal,
- spherical seal,
- sealing performance,
- thermal-structural coupling

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References

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Influence of mechanical sealing surface shape of marine stern shaft on sealing performance

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