﻿ 基于Ansys的舰用大尺寸异形密封圈双向密封性能数值研究
 舰船科学技术  2018, Vol. 40 Issue (6): 57-60 PDF

Numerical study on two-way sealing performance of a ship large size special-shaped sealing ring based on Ansys
SHI Bang-kai, DENG Ru-feng, LI Gui-ju
The 713 Research Institute of CSIC, Zhengzhou 450015, China
Abstract: In this paper, the two-way sealing performance of large size special-shaped sealing ring is numerically calculated and studied based on Ansys software. The numerical calculation of sealing performance of sealing ring by the finite element simulation software and the method of evaluating the sealing performance based on the calculation results is introduced. In order to effectively deal with large size seal structure with large coordination error, which makes the two-way complete seal difficult to achieve, a special-shaped sealing ring is designed, and the two-way sealing performance of the different compression is calculated and analyzed under three typical working conditions, such as installation compression, upper sealing pressure and lower sealing pressure. The simulation results show that under it can achieve good two-way sealing performance with the sealing structure having large coordination error, which verifies the rationality of the design of the sealing structure. The study of the paper can provide reference and guidance for the design and numerical calculation of the other ship large size sealing structure.
Key words: large size sealing structure     special-shaped sealing ring     two-way sealing     numerical calculation
0 引　言

1 密封结构设计

 图 1 密封结构示意图 Fig. 1 Schematic diagram of sealing structure

 图 2 密封圈示意图 Fig. 2 Schematic diagram of seal ring
2 密封结构有限元建模 2.1 材料模型

1）弹性模量E=1.9×1011 Pa；

2）泊松比u=0.3。

1）弹性模量E=6.9×107 Pa；

2）泊松比u=0.499；

3）Mooney-Rivlin模型系数C10=1.87×106Pa，C01=0.47×106 Pa。

2.2 假设条件

1）不考虑海水温度变化对密封圈的影响；

2）不锈钢的弹性模量值远远大于橡胶，假设压环为刚体；

3）橡胶材料各向同性且均匀连续。

2.3 计算模型

2.4 边界条件和载荷

 图 3 密封圈有限元模型 Fig. 3 Finite element model of seal ring
2.5 密封性能判定

3 计算结果及分析 3.1 安装压缩下仿真结果及分析

 图 4 密封圈计算模型边界条件示意图 Fig. 4 Schematic diagram of the boundary condition of the seal ring calculation model

3.2 上部施加密封压力下仿真结果及分析

 图 5 密封圈压缩预紧下接触压力分布图 Fig. 5 Distribution diagram of contact pressure under compression and pretightening of sealing ring

3.3 下部施加密封压力下仿真结果及分析

 图 6 上部施加密封压力时接触压力分布图 Fig. 6 Distribution of contact pressure when the upper seal pressure is applied

 图 7 下部施加密封压力时接触压力分布图 Fig. 7 Distribution of contact pressure when the lower seal pressure is applied
4 结　语

1）异形密封圈在允许压缩范围内随着压缩量的增加，能够实现密封的区域面积随之增加，即设计范围内的密封圈压缩量越大，密封效果越来越好；

2）本文设计的异形密封圈在压缩量变化较大时，密封圈与压环的最大接触压力均大于要求的密封压力0.2 MPa，能够实现大尺寸密封结构在较大配合误差工况下的双向密封，验证了密封结构设计的合理性；

3）本文所采用的仿真计算方法能够为其他密封圈密封性能的数值计算提供参考，仿真结果能够为其他大尺寸密封结构的设计提供指导。

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