| 摘要 |
A brush seal is provided having the conventional 45 DEG bristle angle for part only of the seal length, the angle being varied through at least part of the remainder of the length, preferably finishing at 90 DEG at the ends of the seal. The seal may have the form of a semicircle with straight end-extensions, the bristle angle in the straight extensions being 90 DEG . Provision is also made to vary the length of the exposed part of the bristles so that, in areas where bristle density is high, the actual exposed length is reduced. In a method for manufacturing the seal, the bristle holder is made as a complete loop having two straight sections and two semicircular sections and the bristles are secured in the holder in accordance with the required variations in angle and exposed length such that two mirror-image seals exist on the two sides of a line joining the centerpoints of the straight sections, the holder then being divided into two along that line.
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