| 摘要 |
A stepped shaft passes from a high pressure region, through a vented low pressure region and into an intermediate pressure region. The high pressure region is separated from the low pressure region by a first brush seal and the intermediate pressure region is separated from the low pressure region by a second brush seal. The radius of the shaft is greater at the first brush seal than at the second. This second brush seal bears a circumferential flange on its backplate to deflect fluid leaking between the first brush seal and the shaft radially inwards, the radius of the flange is less than the radius of the shaft at the first brush seal.
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