| 摘要 |
FIELD: heating systems, ventilation systems. ^ SUBSTANCE: invention refers to fan engineering and can be used in axial fan impellers with blade rotary mechanisms, and is meant for improving accuracy and reliability of specified angles of setting and rotating of impeller blades, including start and finite angles. The above effect is reached by the fact that blade roots are provided with gear wheels that are conjugated with gear racks fixed on axial cross beams arranged by means of sliding guides in load-carrying plates so that they can move axially, and conjugated by means of lengthwise-adjustable ball rods connected with adjusting plate with the help of ball insets and compensating flat springs. Impeller casing is equipped with threaded cross beams with safety nuts. ^ EFFECT: improving accuracy and reliability of specified angles of setting and rotating of impeller blades, including start and finite angles. ^ 3 cl, 4 dwg |
