| 摘要 |
A mechanical end face seal of the non-contacting type includes a primary seal ring (38) having a back section (50), a seal face section (46) and a middle section (56) between the seal face (46) and the back sections (50), each primary ring section having a radial dimension, defined as the difference between the outermost radius and the innermost radius of said respective section, the radial dimension of the back section (50) being in a ratio relative to said middle section (56) of between about 1.5 to about 3.1, and more preferably of between about 1.9 to about 2.5, and most preferably about 2.0 to about 2.3. Additionally, the mating seal ring (48) includes grooves (32) extending from one seal ring circumference toward the other and terminating adjacent a dam at a radius Rg, it is beneficial to have the boundary between the grooves and the dam have a radius Rg slightly larger or smaller, within about 10%, than the outer radius of the middle section (56). |
