| 摘要 |
A shaft seal arrangement for turbomachine is presented. The arrangement has a high and a low pressure side at each axial end, a rotor and a fixed stator part, and a dry gas seal. An additional shaft seal is provided at end of high-pressure side in a serial to seal intermediate space and has a fixed and a rotating shaft seal part. A central shaft seal surface extends in circumferential and in axial direction and is arranged between fixed and rotating shaft seal part on a fifth diameter coaxially with respect to rotational axis. A fourth stationary seal is arranged between fixed seal element and stator part on a fourth diameter to seal a first differential pressure. Damage due to changes of thrust is prevented if the dry gas seal is defective by difference between the fourth and fifth diameter being less than 10% of the firth diameter. |
