| 摘要 |
A fan casing volute comprises two half members which are joined to one another, each half member being formed by a moulding process from a polymeric material, the volute being characterized by central bearing housings in intake openings of the volute end plates, and a plurality of U-shaped arms which support the bearing housings, all being in a single monolithic moulding, and all having substantially similar cross-sectional thicknesses.
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