卡箍快开卧式深海模拟舱的径向密封结构及其密封可靠性评价

发布时间：2018-04-04 02:18

本文选题：深海模拟舱　切入点：O形橡胶圈　出处：《北京工业大学学报》2016年03期

【摘要】：针对卡箍快开盖结构的卧式深海模拟舱在深海高背压环境下存在密封可靠性不足问题,提出了一种深海模拟舱O形圈径向密封结构,建立了该结构的非线性有限元模型.通过O形圈的密封面接触应力与内部Von Mises应力评价该结构的密封可靠性,讨论了舱内介质压力、O形圈预压缩率、槽口倒圆、配合间隙对深海模拟舱密封性能的影响.仿真结果表明:加压过程中接触应力峰区位置显著改变,舱内水压由0 MPa加至25 MPa时,橡胶圈形状及Von Mises应力分布急剧变化,由25 MPa加至45 MPa时,橡胶圈形状及Von Mises应力峰区位置基本不变,该结构能够实现45 MPa压力下的有效密封.预压缩率的增加会显著增加主接触面密封带宽度,增大槽口倒圆有助于降低Von Mises应力,Von Mises应力峰值随配合间隙的增加先增大后减小,增大配合间隙有助于提高密封带宽度.试验结果证明:当O形圈的预压缩率为10%、槽口倒圆为0.4 mm、配合间隙为0.7 mm时,利用该密封结构所研制的深海高压舱在40、45、50 MPa水压时均能保证有效密封.
[Abstract]:In order to solve the problem of insufficient sealing reliability in deep sea high back pressure environment, an O-ring radial seal structure of deep sea simulator is proposed, and the nonlinear finite element model of the structure is established.The sealing reliability of the structure is evaluated by the contact stress of the sealing surface of the O-ring and the internal Von Mises stress. The effects of the pre-compression ratio of the O-shaped ring, the reverse circle of the groove and the clearance on the sealing performance of the deep-sea simulated cabin are discussed.The simulation results show that the position of contact stress peak area changes significantly during compression. When the water pressure in the cabin is increased from 0 MPa to 25 MPa, the shape of rubber ring and the stress distribution of Von Mises change sharply, from 25 MPa to 45 MPa.The shape of rubber ring and the position of Von Mises stress peak region are almost unchanged. The structure can be effectively sealed at 45 MPa pressure.With the increase of precompression ratio, the width of seal band of the main contact surface will be increased significantly. Increasing the reverse circle of the slot is helpful to reduce the Von Mises stress and the peak value of the Von Mises stress increases first and then decreases with the increase of the fit gap, and the increase of the fit gap will help to increase the width of the seal band.The test results show that when the pre-compression ratio of O-ring is 10 mm, the reverse circle of groove is 0.4 mm, and the matching clearance is 0.7 mm, the deep-sea high-pressure chamber developed by using this sealing structure can ensure the effective seal at 4045-50 MPa water pressure.
【作者单位】：北京工业大学机械与应用电子技术学院;
【基金】：国家“863”计划资助项目(2012AA091103) 国家自然科学基金资助项目(51375018) 北京市长城学者计划(CIT&TCD 20130316)
【分类号】：P742;TB42

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