Study on the sealing performance of flexible graphite braided packing based on three-dimensional braiding model
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摘要:
为研究柔性石墨编织盘根的密封性能，分析了柔性石墨编织盘根股线的空间构型和运动轨迹，建立了柔性石墨编织盘根的三维编织模型，该模型相比于多孔介质模型等传统的非金属垫片模型，不仅可以考虑到股线之间的相互作用，并且具有良好的压缩回弹性能，能更好地模拟其真实工作状态，再通过数值仿真方法得到不同轴向载荷、介质压力和介质温度下的泄漏量。结果表明：数值仿真结果与试验结果有较好一致性。泄漏量与轴向载荷呈反比，随着轴向载荷的增加，泄漏通道减少，泄漏量逐渐减小，最后趋于平稳状态，密封性能提高。泄漏量与介质压力呈正比，当介质压力较大时，可以适当增大轴向载荷来提高密封性能。泄漏量与介质温度呈正比，当介质温度增大时，泄漏量小幅度增大，总体对泄漏量的影响较小。
Abstract:To study the sealing performance of flexible graphite braided packing, the spatial configuration and motion trajectory of its yarns were analyzed, and a three-dimensional braiding model was established. Compared with traditional non-metal gasket models such as the porous media model, this model not only considered the interaction between yarns but also demonstrated good compressive resilience, helping to better simulate its real working condition. The leakage under different axial loads, medium pressures, and medium temperatures was obtained through numerical simulation. The results indicated that: numerical simulation results were consistent with the experimental results. The leakage was inversely proportional to the axial load. The increase in axial load reduced the leakage channels, leading to a gradual decrease and eventual stabilization of the leakage rate, thereby improving the sealing performance. The leakage was directly proportional to the medium pressure. When the medium pressure was high, the axial load can be appropriately increased to improve the sealing performance. The leakage was directly proportional to the medium temperature. When the medium temperature increased, the leakage increased slightly, and overall, the impact on the leakage was relatively small.
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表 1 材料属性定义
Table 1. Material property definition
应变 应力/MPa 弹性模量/MPa 0 0 0 0.050 1.867 37.340 0.075 4.105 89.520 0.098 7.851 162.870 0.140 20.758 307.310 0.168 34.760 500.071 0.210 58.288 560.190 0.230 70.000 585.600 
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