Axial impeller with vanes and hubs in composite hinge

Abstract

The invention discloses an axial impeller with vanes and hubs in composite hinge, comprising the hubs, the vanes and vane joints connected with the connecting ends of the vanes. The axial impeller has the key points that the hubs are provided with at least two composite hinge devices with zero bending moment; each composite hinge device is provided with a vertical shaft hole and a horizontal shaft hole; a joint of double lugs of each hub is hinged with each vertical shaft hole through a vertical shaft; the vane joints are hinged with the horizontal shaft holes through horizontal shafts; the vanes have a downward swinging angle less than or equal to 5 DEG, an upward swinging angle less than or equal to 3 DEG and a left and right swinging angle less than or equal to 3 DEG. In the invention,two bending moments at the roots of the vanes are eliminated, the problem that the roots of the vanes of a large axial flow fan is easy to crack is solved, the structure is optimized, the weight is reduced, the production cost is reduced, the service life of the large axial flow fan is prolonged, and meanwhile, the quality is ensured. The axial impeller in composite hinge can be widely installed and used on equipment such as a large evaporative condenser, a large air-cooling tower and the like.

Description

Technical field

[0001] The invention relates to the technical field of fans, in particular to a large axial flow fan impeller with no bending moment at the blade root. Background technique

[0002] Large air volume axial flow fans are extremely versatile. However, this type of fan has a large load and long blades. In addition, the blades and the hub are usually fixedly connected by welding, riveting, and bolts. Two mutually perpendicular bending moments reach their maximum at the blade root. This bending moment is particularly prominent on large-size impellers, so that structural fractures of the blades occur. Taking the impeller of a large axial flow fan with a diameter of 10m as an example, the bending moment in the vertical direction at the root of the blade can reach more than 8000N.m. In order to meet the strength requirements of fan blades, the traditional method is to design the structural section of the blade root to be very large and strong, and generally use str...

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