深海环境中水下滑翔器密封结构数值分析

Numerical Analysis of Underwater Glider Sealing Structure in Deep Sea Environment

为检验水下密封结构的可靠性,利用Ansys Workbench集成平台对有无挡圈配合的O形密封圈的变形和受力情况进行比较分析,并对深水环境中有挡圈配合的O形圈的密封性能进行数值模拟分析。结果表明:在介质压力较大时,有挡圈配合的O形圈可有效防止挤入咬伤,在同样保证密封可靠的条件下最大Von Mises应力可减小20%以上;当介质压力为10 MPa左右时,有挡圈配合的O形圈的最大Von Mises应力有明显的拐点,介质压力大于10 MPa后,O形圈的应力变化趋于平缓,可避免O形圈被破坏导致的密封失效;有挡圈配合的O形圈结构中,起密封作用的是O形圈而非挡圈,挡圈的作用主要是改善O形圈的受力,提高整个密封结构的可靠性。模拟的结果可以说明O形圈配合挡圈提高密封可靠性的原理,为水下密封结构的可靠性检验和密封结构的优化提供了有效的方法。

In order to test the reliability of underwater sealing structure,Workbench integrated platform was used to compare and analyze the deformation and stress of the O-rings with and without back-up rings.The sealing performance of O-rings with retaining rings in deep water environment was simulated and analyzed.It is found that O-rings with back-up rings can effectively prevent squeezing bite when medium pressure is high,and under the same condition,the maximum Von Mises stress can be reduced by more than 20%.When the medium pressure is about 10 MPa,the maximum Von Mises stress of O-ring with back-up ring has an obvious inflection point.When the medium pressure is greater than 10 MPa,the stress change of O-ring tends to be gentle,which can avoid seal failure of O-ring caused by damage.In the O-ring structure with back-up ring,the O-ring plays the role of sealing,while the function of the back-up ring is mainly to improve the stress of the O-ring and improve the reliability of the whole sealing structure.This simulation results can explain the principle of O-ring with back-up ring to improve sealing reliability,and provide an effective method for reliability inspection and optimization of underwater sealing structure.