| 摘要 |
A fluid seal between two spaces, especially spaces between two concentric shafts, has radially extending inner rings secured to the inner shaft and forming a radially extending guide slot, and at least two radially outer ring segments (3a, 3b) guided in the radially extending guide slot to form a gas bearing type gap (7') between a radially inwardly facing surface of the outer hollow shaft and a radially outwardly facing surface of the respective ring segment, when the segments are in their operating position. Each ring segment is biased by a tension spring (15) into a radially inward rest positon. The inward pulling force of these springs is overcome by the centrifugal force which moves the ring segments radially outwardly when the inner shaft rotates so that the ring segments form the gas bearing type gap. The springs are so dimensioned that the ring segments form a gas bearing type of seal in said gas bearing type gap under all operating conditions including a start-up phase and a deceleration phase of an engine.
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