| 摘要 |
1,193,604. Mechanical seals. WESTING- HOUSE ELECTRIC CORP. 2 Jan., 1969 [15 Jan., 1968], No. 306/69. Heading F2B. A seal for controlling the linkage of fluid along a rotatable shaft is formed by a face-type seal ring 20 having a seal face area which defines with an opposing flange 16 a flow path 50 which is provided with an entrance region converging from a high-pressure region 12 towards an annular minimum thickness region, and an exit region leading from the annular minimum thickness region to a low-pressure region, the axial projection of the seal face area forming the converging entrance region being at least as large as the axial projection of the effective area exposed to the high-pressure fluid on the opposite side of the ring. The arrangement provides lift for the ring 20 upon pressurization and before rotation of the shaft to prevent damage. The ring 20 is sealed by an 0-ring 34 to a retainer 24, prevented from rotating by pins 29 and urged towards the flange 16 by light coil springs 40. The seal face area forming the converging entrance region may be stepped instead of tapered and the area between edges 51, 54 may be flat instead of tapered. |
