| 摘要 |
<p>A first arcuate member, a second arcuate member, and a third arcuate member interposed between the first and second arcuate members, the third arcuate member in spaced relation to the first arcuate member defining a first gap between them, the third arcuate member in spaced relation to the second arcuate member defining a second gap between them, each of the arcuate members having a radially inner surface facing the reference axis and a radially outer surface facing away from the reference axis, and the radially inner surface of the third arcuate member defines a section of a cone. A backing sheet, spans between the first and second arcuate members and sealingly secured to the radially outer surfaces of it, the backing sheet in spaced relation to the radially outer surface of the third arcuate member. Vane walls, are integral with the first, second and third arcuate members, each vane wall having a first end and a second end, the first end of each vane wall spanning the first gap thereby connecting the radially inner surfaces of the first and third arcuate members, and the second end of each vane wall spanning the second gap connecting the radially inner surfaces of the second and third arcuate members.</p> |
