| 摘要 |
PURPOSE:To improve durability by lowering contact surface pressure of a sealing part, by setting up at least an outer diameter of the sealing part as small as possible to an outer diameter of an inner wall of a containing ring of a shaft sealing device. CONSTITUTION:In a sealing part 10 of a shaft sealing device, an inner diameter D1 of a driven ring 8 is formed smaller than an outer diameter Dm of an inner wall of a containing ring 5. Then, a pressure receiving ratio B=(D2<2>-Dm<2>)/ (D<2>-D1<2>) (D2 is an outer diameter of a sealing part) becomes small, contact surface pressure ps=pf+ or -Bpl (pf is base contact surface pressure, pl is liquid pressure) is not increased so much even if liquid pressure pl is increased and a reduction of the contact surface pressure of the sealing part 10 becomes possible. |
