| 摘要 |
This invention concerns a packing seal which is intended particularly for reciprocating piston engines and which, for example, can be placed in the groove (31) around the circumference of a piston (22) of a reciprocating engine. The packing seal comprises a first segment ring (1) which has at least two sealing segments (3) with locking segments (4) positioned between them in alternating order. These locking segments (4) and sealing segments (3) taper in opposing directions radially towards the inside and outside respectively in wedge-shaped form. Furthermore, the packing seal comprises at least one additional or second segment ring (20) which also has at least two sealing segments (23) with locking segments (24) positioned alternately between them. The sealing segments (23) and locking segments (24) both taper radially towards the inside. The locking segments (24) extend over a larger arc than the sealing segments (23). The sealing segments (23) of this second segment ring (20) overlay the locking segments (24) of the axially adjacent first segment ring (1) cited above. This additional segment ring (20) of the packing seal (10') is made and designed in such a way that its sealing segments (23) supported by a compressive force derived from the working pressure are reliably pressed against the seat to be sealed without any additional assistance. To prevent the sealing arrangement of the packing seal (10') from coming apart during operation due to rocking motion, a security device (40) is provided which borders a slot present in axial direction between the packing seal (10') and the groove (31) and diminishes this slot, preferably in dependence on the working pressure. This security device (40) can simultaneously diminish the radially-directed working pressure on the packing seal in the groove base (33). |
