| Citation: | YANG Zheng, LI Junwei, ZHU Jingwen, et al. Research on sealing performance of 60° spherical cone joint for pipeline[J]. Journal of Aerospace Power, 2025, 40（8）：20230746 doi: 10.13224/j.cnki.jasp.20230746
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A finite element analysis was conducted to investigate the sealing effectiveness of the 60° spherical cone joint under different tightening torques, working pressures, and materials. The analysis evaluated the leakage rate and discussed the influence of changing conditions on the structural sealing performance. The results indicated that increasing the tightening torque can improve the sealing effectiveness. Specifically, the highest rate of decrease in leakage rate was observed when the tightening torque increased from 15 N·m to 25 N·m. Conversely, increasing the working pressure reduced the sealing effectiveness. Within the range of 7 MPa to 25 MPa, the leakage rate was kept at a relatively low level, with a maximum leakage rate of 1.86×10−6 Pa·m3/s. When the working pressure increased from 25 MPa to 50 MPa, the rate of leakage escalated, reaching a maximum of 8.65×10−6 Pa·m3/s, which was 4.7 times higher than that at 25 MPa. The sealing performance was more sensitive to the pressure change. For both 1Cr18Ni9Ti and LF3 materials, good sealing can be achieved under different combinations, with slightly better sealing performance observed for different materials used in spherical joints and conical nozzles compared with the same material. Notably, the best sealing effect was achieved with 1Cr18Ni9Ti for the spherical joint and LF3 for the cone hole.
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