| 摘要 |
The invention concerns scroll discharge decanter centrifuges of the type in which the interior of the centrifuge is to be kept sealed from the atmosphere and which comprise a stationary assembly which includes an outer casing, a rotary assembly which includes a solid bowl which is adapted to be rotated within the stationary casing at a first speed and a scroll conveyor which is rotatable within the bowl at a second, slightly different speed. A plurality of sealing devices are arranged to be effective between the rotary assembly and the stationary assembly. Each sealing device comprises a first ring fixed relative to the stationary assembly and a second, coaxial ring which is adapted to rotate with the rotary assembly. That surface of the first ring which faces the second ring contains a plurality of gas jet nozzles by way of which pressurized gas can be supplied to an annular clearance gap between the first and second rings. One of the rings of each bearing is sealed by means of one or more elastomeric seals to a further annular member which is stationary relative to that one ring such that that ring is permitted to have a predetermined amount of radial and angular freedom relative to the further annular member for accommodating misalignment between the rotary and stationary assemblies.
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