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针对油套管特殊螺纹球面对锥面密封结构,基于Hertz接触理论建立了考虑密封面作用扭矩的球面密封接触应力理论模型,研究了球面半径、管体球面弹性模量和密封面作用扭矩对密封面接触宽度和接触应力的影响规律并提出改善球面密封性能的措施,结果表明:随球面半径增加,密封面接触宽度呈抛物线增大,接触应力呈指数减小,且密封面应力分布趋于均匀;随球面弹性模量降低,密封面接触宽度增大,接触应力减小;随密封面作用扭矩增加,密封面接触宽度和接触应力均呈抛物线增大。为提高球面密封性能,建议适当增大球面半径、对球面熔覆合金以降低其弹性模量,同时合理控制密封面作用扭矩,从而增大密封面接触宽度并适当降低密封面接触应力水平。研究结果对优化密封结构、控制上扣扭矩以及提高螺纹密封完整性具有重要理论指导意义。
According to Hertz contact theory, a theoretical model of spherical seal contact stress considering the action torque of sealing surface was established. The spherical radius, the spherical surface elastic modulus of tube and the torque acting on the sealing surface were studied. The results show that the contact width increases with the increase of the spherical radius, the contact width increases exponentially, and the stress distribution in the sealing surface tends to As the elastic modulus of the spherical surface decreases, the contact width of the sealing surface increases and the contact stress decreases. With the increase of the acting torque of the sealing surface, the contact width and the contact stress of the sealing surface all increase in a parabolic manner. In order to improve the performance of the spherical seal, it is suggested to increase the radius of the spherical surface, to reduce the modulus of elasticity of the spherical cladding alloy and to control the acting torque of the sealing surface rationally, so as to increase the contact width of the sealing surface and reduce the contact stress level of the sealing surface. The results of the study have important theoretical significance for optimizing the seal structure, controlling the buckling torque and improving the thread seal integrity.