Page 95 - 《摩擦学学报》2021年第4期
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538                                     摩   擦   学   学   报                                 第 41 卷

               24                              24                               24
              Contact pressure/MPa  16 8      Contact pressure/MPa  16 8       Contact pressure/MPa  16 8
               20
                                                                                20
                                               20
                                               12
               12
                                                                                12
                          Without a boss
                4
                                                          With a boss
                          With a boss           4         Without a boss        4              Without a boss
                                                                                               With a boss
                0                               0                               0
                 1.6  1.8  2.0  2.2  2.4  2.6  2.8  3.0  1.6  1.8  2.0  2.2  2.4  2.6  2.8  3.0  1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
                       Contact position/mm             Contact position/mm              Contact position/mm
                          (a) ε=3%                        (b) ε=5%                          (c) ε=7%

                     Fig. 10  Variations of contact pressure distribution of inner lip under different precompression rate (P=9 MPa)
                                    图 10    不同预压缩率下内唇口接触压力分布的变化(P=9 MPa)

               24                              24                               24
              Contact pressure/MPa  16 8      Contact pressure/MPa  16 8       Contact pressure/MPa  16 8
                                               20
               20
                                                                                20
                                               12
               12
                                                                                12
                           Without a boss
                4
                                                          With a boss
                                                                                               With a boss
                           With a boss          4         Without a boss        4              Without a boss
                0                               0                               0
                 1.6  1.8  2.0  2.2  2.4  2.6  2.8  3.0  1.6  1.8  2.0  2.2  2.4  2.6  2.8  3.0  1.6  1.8  2.0  2.2  2.4  2.6  2.8  3.0
                       Contact position/mm             Contact position/mm              Contact position/mm
                          (a) ε=3%                        (b) ε=5%                          (c) ε=7%

                     Fig. 11  Variations of contact pressure distribution of outer lip under different precompression rate (P=9 MPa)
                                    图 11    不同预压缩率下外唇口接触压力分布的变化(P=9 MPa)
                 24     Without a boss              1.8             24     Without a boss              1.8
                Maximum contact pressure/MPa  16  With a boss  1.4 Contact width/mm  Maximum contact pressure/MPa  16  With a boss  1.4 Contact width/mm
                                                    1.6
                                                                                                       1.6
                 20
                                                                    20
                                                                                                       1.2
                                                    1.2
                                                                                                       1.0
                                                    1.0
                                                                    12
                 12
                                                                                           With a boss
                                        With a boss
                                                    0.6
                                                                                                       0.6
                  8                     Without a boss  0.8         8                      Without a boss  0.8
                     0    2   4    6   8   10   12                      0    2   4    6   8   10   12
                            Medium pressure/MPa                                Medium pressure/MPa
                               (a) Inner lip                                      (b) Outer lip

                      Fig. 12  Variations of maximum contact pressure and contact width under different medium pressure(ε=5%)
                                    图 12    不同介质压力下峰值接触压力和接触宽度的变化(ε=5%)

            介质压力大于3 MPa时,有台结构的弹簧蓄能密封圈                          偏摆,使干气密封端面间隙发生变化,理论上在闭合
            接触宽度大于无台结构的蓄能密封圈,但峰值接触压                            力带动下,推环带动静环应有相应的追踪响应(追随
            力更小.                                               性). 由文献[14]可知在给定条件下无台弹簧蓄能密封

                                                               圈由静摩擦到滑动摩擦的突跳距离约为25~50 μm,因
            4    摩擦特性分析
                                                               此本文作者针对50 μm推环位移范围的弹簧蓄能密封

            4.1    摩擦力随推环微动的变化                                 圈的摩擦特性展开讨论.
                动环安装在轴上,轴系的振动会造成动环移动或                              采用Restart方法对推环逐步施加沿Z/-Z向的位
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