| 摘要 |
<p>A turbo fluid machinery comprising a primary dry gas seal (9) and a secondary dry gas seal (10), wherein a working gas leaking through clearances between rotating rings (7a, 7b) rotating together with a rotor (4) and fixed rings (8a, 8b) is detected by a pressure switch (14) and a flowmeter (15) installed in a primary seal vent line (12) if a leak amount is abnormal, a working gas leaking through clearances between a labyrinth seal (16) and the sealing surface (17) of the secondary dry gas seal is discharged through a flow path (34) to the outside of the machinery together with a purge gas purged from the outside to a space (18) after passing through a space (33) and, because a control valve (19) installed in a purge gas line acts so that the flow rate can be maintained in the purge gas line if an abnormality occurs at the secondary dry gas seal, the flow rate detected by the flowmeter installed in the purge gas line is increased and an abnormality of the secondary dry gas seal is detected.</p> |
