| 摘要 |
A mechanical end face seal includes one seal ring having two elements, a seal face extension portion immediately adjacent a sealing face and a seal ring body removed from the sealing face. Each of the ring elements has a radial outer diameter dimension and a radial inner dimension. The seal face extension portion is defined by an annular gap separating the seal ring body from the seal face extension portion. The annular gap opens out onto the high-pressure side of the seal. The axial thickness of the seal face extension portion is much smaller than the radial dimension of the sealing face. The seal face extension portion is connected to the thicker seal ring body by means of a thin connecting "neck", which has a small radial dimension than the radial dimension of the sealing face. Preferably, the radial dimension of the neck has a ratio relative to the radial width of the ring sealing face between about 0.10 to about 0.70, more preferably about 0.25 to about 0.60, and most preferably about 0.35 to about 0.45. The relative ratio of the axial thickness of the seal face extension portion to the radial width of the second sealing face is in a preferable range of from about 0.03 to about 0.60, in a more preferable range of from about 0.05 to about 0.50, and in an optimal range of from about 0.08 to about 0.15.
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