| 摘要 |
A vertically directed dryer unit ( 10 ) for compressed air, comprising a dryer cartridge ( 22 ) which, together with a housing ( 16, 18, 20 ), defines an inlet head area ( 92 ) and an outlet head area ( 72 ). A plurality of hollow membrane fibers ( 30 ) extend inside the cartridge between the two head areas, the wall material thereof being more permeable with respect to water vapor than air. An outlet valve ( 90 ) is provided between the outlet head area ( 72 ) and an outlet ( 74 ) of the drier unit. Said valve only opens when the pressure in the outlet head area ( 72 ) produces sufficient pressure for the provision of purging air. The purging air is fed to the outer surface of the membrane fibers ( 30 ) via a throttle element ( 70 ).
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