| 摘要 |
FIELD: axial-flow fans. SUBSTANCE: axial-flow fan includes housing with impeller mounted inside it. Impeller is fitted with twisted blades secured on bush; center line of profile of these blades is described by arc of a circle; sag; reduces towards periphery following the cubical parabola law. Fan is also provided with flow straightener. Change of angle of profile in each section by radius of impeller blade is made in accordance with law of cubical parabola described according to respective equation. Ratio of sag to chord of blade of flow straightener changes in straight line described by respective equation. EFFECT: enhanced efficiency. 3 dwgs
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