| 摘要 |
In a gas-cooled dynamoelectric machine, sealing means are provided at each end of the machine to prevent the axial leakage of gas coolant out of the machine along the rotor surface. One type of known seal comprises an annular holder at each end of the machine, each holder having resiliently mounted therein a pair of sealing rings spaced apart in the axial direction to define an oil feed annulus therebetween. Seal oil is supplied to the oil feed annulus at a higher pressure than the gas coolant pressure thereby sealing the gas coolant into the machine. If the gas coolant design pressure is raised so must the seal oil pressure be raised which may ultimately cause the sealing ring adjacent the ambient side of the sealing means to bind against the holder in the radial direction. The present invention is directed toward maintaining the radial mobility of shaft seals, of the type described, against pressure increases between the sealing rings.
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