Analysis of Factors Influencing Hermetic Seal Performance with a Spherical-conical Surface and Special Screw Threads

doi:10.11885/j.issn.1674-5086.2016.07.25.04

Abstract

Abstract: A theoretical model for calculating the hermetic seal pressure of special screw threads subjected to an applied torque from a spherical-conical sealing surface is established. The influence of the spherical radius, cone and taper, and applied torque of the sealing face are studied. According to the results, the hermetic seal pressure of the screw threads declines according to a power law with increasing spherical radius; the hermetic seal pressure declines gradually with an increase in the cone and taper; and the hermetic seal pressure increases parabolically with increase in the make-up torque added to the sealing surface. Generally, the spherical radius and make-up torque added to the sealing surface have a significant impact on the hermetic seal performance of the special screw threads. It is suggested to optimize the spherical radius while properly controlling the applied torque such that the stress distribution of the sealed contacts can simultaneously satisfy the hermetic seal performance and stop the yielding of the sealing surface.

Key words: oil casing, special screw threads, spherical seal, hermetic seal pressure, influence factors

CLC Number:

TE38

XU Honglin, YANG Bin, SHI Taihe, ZHANG Zhi. Analysis of Factors Influencing Hermetic Seal Performance with a Spherical-conical Surface and Special Screw Threads[J]. 西南石油大学学报(自然科学版), 2017, 39(6): 162-166.

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