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| Finger seals are non-contact fluid seals similar in purpose to labyrinth or brush seals in that they act as a barrier between two areas of the same or different pressures, but allow a rotating shaft to penetrate through them from one side to the other. Applications include sealing rotating parts in turbine engines, pumps, rotating air motors, or other applications where a shaft (often at high rotational speeds and temperatures) needs to be sealed against incursion or excursion of oil, air, water, or other gases or fluids. Significantly less expensive to produce than either labyrinth or brush seals, they consist of long, overlapping "fingers" that extend inward from the mounting rim angled in the direction of rotation. The fingers can flex to accommodate expansion or contraction of the shaft from dynamic or thermal loads, or other forces. Because of gaps between the fingers to allow for this flex, two or more offset layers of fingers and outer plates make up the seal. Because of their manufacturing simplicity they can be produced at a fraction of the cost of other seals that do similar jobs.Honeywell fingers seals sealing rotating shaft often temperatures pressures inexpensive manufacture yet positive control leakage flow either conventional brush-type labyrinth controlled need introduced overlapping layers accommodate growth motion thermal dynamic forces minimal wear Figure shows conceptual layout direction rotation counter-clockwise |
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