| 摘要 |
A pair of primary and secondary mechanical seals 3, 4 are arranged tandem in an axial direction around a rotating shaft in a space between the rotating shaft 2 and a housing 1 having a shaft sealing part. The center or intermediate liquid CL is sealed into a center room or intermediate chamber B between both mechanical seals 3, 4. The center liquid has an amount that is less than the volume of the center room B and enough to soak one part of rotating elements of the secondary mechanical seal 4. The gas vent line GV1 is provided with the housing 1 of the shaft sealing part. The gas vent line GV1 faces and opens to the center room B. The baffle plate 5 is provided with the housing 1 of the shaft sealing part. The baffle plate 5 intersects a circumferential direction of the center room B. Thus, when rotating the rotating shaft, the center liquid CL is stirred and scattered by collision with the baffle plate 5 to lubricate the sealed slide surface 4S. The vaporized gas from the sealed liquid SL, which is leaked from the primary mechanical seal 3 to the center room B, does not collect in the inner circumferential part of the center room B. It does not form gas zone. It is discharged from the gas vent line GV1.
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