| 摘要 |
<p>Shaft sealing apparatus for preventing process gases or fluids from escaping a rotary machine such as a turbine or a compressor. Oil under relatively high pressure, this is, pressure slightly higher than the pressure of the working substance contained in the machine, is caused to flow between the shaft and a plurality of axially aligned, free floating, bushings (seals) encompassing the closure end of the shaft. The oil is introduced into the flow path adjacent a first gas side seal and flows along the shaft towards atmosphere or an area of lower pressure through a series of oil breakdown seals positioned behind the gas side seal in relation to the direction of flow. A secondary low pressure oil system is arranged to pass cooling oil over the back side of the breakdown seals to prevent overheating of the seals during machine start-up or when the machine is operating under abnormal load conditions.</p> |
