| 摘要 |
<p>With a turbo type fluid machine provided with a primary dry gas seal (9) and a secondary dry gas seal (10), abnormality in an amount of a working gas leaked from between a rotating ring (7a, 7b) adapted to rotate with a rotor (4) and a stationary ring (8a, 8b) is detected by a pressure switch (14) and a flow meter (15), which are provided in a primary seal vent line (12), and meanwhile, the working gas leaking from sealing surfaces (17) of a labyrinth seal (16) and the secondary dry gas seal, together with a purge gas purged to a space (18) from outside is discharged outside the machine from a flow passage (34) via a space (33). when abnormality generates in the secondary dry gas seal, a control valve (19) provided in the purge gas line operates to secure a flow rate in the purge gas line, so that a flow rate detected by the flow meter provided in the purge gas line increases, and thus abnormality in the secondary dry gas seal is detected. <IMAGE></p> |
