| 摘要 |
<p>A fan blade mounting system for large air-moving fans includes a radially extending hub strut (14), a blade root member (60) pivotally coupled to an end of the hub strut (14) for receiving a blade skin, and a tube end (22) located between the blade root member (60) and the hub strut (14). A pair of resilient mounts (25) are utilized in the blade root member (60) to effectively pivotally couple the blades (12) to the hub, thus relieving most of the vertical bending moment transferred to the hub (10) and eliminating critical frequencies associated with the fan. The hub strut (14) is connected to the hub (10) of the fan by a stud having right- and left-handed threads and a wall thickness adjacent to the threads sufficient for distributing the stresses substantially uniformly on the threads, thereby improving fatigue resistance. The resilient mounts (25) comprise a metal core (26) and a metal sleeve (27) with a resilient elastomeric layer (28) between the core (26) and the sleeve (27). The sleeves (27) are connected to the blade root member (60) and the cores (26) of the two mounts are clamped to the tube end (22).</p> |
