深海环境中水下滑翔器密封结构数值分析

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。

Numerical Analysis of Underwater Glider Sealing Structure in Deep Sea Environment

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.