Multipart Fan Wheel Assembly for Replaceable Blade Alignment
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Solution Overview
Problem
Existing fan wheels, particularly axial fan wheels, are difficult to manufacture, require complex assembly, and cannot be easily adjusted or repaired due to integral design, leading to issues like blade misalignment and high replacement costs.
Innovation Solution
A multipart fan wheel design with separately formed fan wheel blades and hub, where blades are fixed using screws with longitudinal axes parallel to the rotation axis, incorporating centering elements and screw receptacles for simplified assembly and alignment, and optional metal inserts for stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fan wheel blades are manufactured integrally with the fan wheel hub, then manufacturing is simpler, but the blades cannot be adjusted or replaced individually
Solution Approach 1:
The fan wheel is divided into separate components: the hub and multiple blades that can be assembled independently. Each blade can be individually adjusted, removed, or replaced while the others remain in place, providing versatility without complicating the overall manufacturing process.
2Strength
If fan wheel blades are manufactured integrally with the fan wheel hub, then structural integrity is improved, but the entire fan wheel must be replaced if a single blade is defective
Solution Approach 1:
The blade and hub are designed as separate segments that connect through a standardized interface. This segmentation allows individual blades to be replaced without affecting the structural integrity of the entire fan wheel assembly, as the connection mechanism maintains strength while enabling modular replacement.
3Ease of operation
If fan wheel blades are clamped or fixed to the hub with screw connections, then assembly is achieved, but blade alignment may change over time due to partial rotation
Solution Approach 1:
Centering elements are incorporated into the blade-hub connection mechanism to preliminarily establish precise alignment before the final tightening of screw connections. This preliminary centering action ensures that blades are properly positioned and prevents misalignment during operation, maintaining stable composition throughout the fan wheel's service life.
4Strength
If screws are screwed in along an axis tilted relative to the rotation axis, then blade fixation is achieved, but manufacture and assembly become complex and expensive
Solution Approach 1:
Instead of tilting the screw axis relative to the rotation axis to achieve blade fixation, the invention inverts the approach by making the screw axis parallel to the rotation axis. This inversion simplifies the manufacturing and assembly processes while the screw connections still provide adequate fixation strength through proper positioning and clamping force.
Data Source
AI summary
A fan wheel (1) with a plurality of fan wheel blades (10) and a fan wheel hub (20) can be fixed to a motor (30) in order to drive the fan wheel (1) about a rotation axis (X) that extends centrally through the fan wheel hub (20). Each of the fan wheel blades (10) can be screwed to the fan wheel hub (20) by at least one screw (41, 42). A longitudinal screw axis (L) extends parallel to the rotation axis (X). The fan wheel hub (20) has a corresponding screw receptacle (21, 22) for each of the screws (41, 42).