| 摘要 |
A transverse flow fan having improved characteristics for improving performance thereof while substantially reducing or eliminating fan noise characteristic of such fans. The blade angles of the impeller blades are in a particular relationship to the control angles of the surfaces of the tongue in the casing which extends close to the periphery of the fan. Various control means are provided for improving and stabilizing flow through the impeller, such as a control plate in the inflow space, a tongue surface in the outflow space with a specially shaped depression therein, at least one ring around the impeller at a point along the axial length thereof, and various projections projecting into the outflow space. Particular limited relationships are provided between the position of the tongue and the position of the curved outer wall of the casing where it is closest to the impeller and the curvature of the wall relative to the dimensions of the impeller.
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