| 摘要 |
PROBLEM TO BE SOLVED: To properly seal between a pump chamber and an oil chamber by forming and keeping a lubricant film between sealed end faces in a stable state.SOLUTION: A mechanical seal includes a metallic stationary-side holding ring 12 held on a partitioning wall 3, a ceramics stationary seal ring 13 fitted and fixed to the stationary-side holding ring 12 through O-rings 18, 19 in a non-contact state, a metallic rotary-side holding ring 14 fixed to an impeller shaft 6, a ceramics rotary seal ring 15 fitted and fixed to the rotary-side holding ring 14 through O-rings 23, 24 in a non-contact state, and a spring member for pressing and energizing the stationary seal ring 13 to the rotary seal ring 15, to seal a pump chamber 1 in an outer peripheral-side region and an oil chamber 5 in an inner peripheral-side region of a relative rotary slide-contact part S of both seal rings 13, 15. Inner diameters of both seal rings 13, 15 are the same as each other, and inner peripheral faces of their tip parts 13b, 15b are formed into taper faces 13g, 15g of which diameters are gradually decreased from inner peripheral edges of sealed end faces 13a, 15a.SELECTED DRAWING: Figure 1 |
