Fan Wheel Stabilizing Ring Balancing Weight Positioning
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Solution Overview
Problem
Existing fan wheels face challenges in achieving stable balancing and reducing running noise due to shifting balancing weights when accelerated, which affects service life and noise levels.
Innovation Solution
A fan wheel design with defined fastening positions on a stabilizing ring spaced radially from the outer diameter and hub, featuring profiling such as sawtooth patterns for secure attachment of balancing weights, preventing circumferential movement and deformation, and allowing fine incremental adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If balancing weights are attached to the outer circumference of the fan wheel, then balancing can be achieved, but the balancing weights shift in the circumferential direction when the fan wheel accelerates, reducing balancing precision
Solution Approach 1:
A stabilizing ring is introduced as an intermediary component between the fan wheel and the balancing weights. The ring provides defined fastening positions through profiling that prevent circumferential shifting of balancing weights during acceleration, while the ring itself is positioned radially inward from the outer diameter to maintain structural stability.
Solution Approach 2:
The balancing weight attachment is moved from the outer circumference (two-dimensional surface) to a stabilizing ring positioned radially inward (introducing a radial dimension change). This dimensional shift allows for defined fastening positions that constrain circumferential movement while maintaining effective balancing functionality.
2Measurement precision
If balancing weights are attached to the outer diameter of the fan wheel, then balancing is achieved, but weight tolerances have a more significant negative effect on the balancing result
Solution Approach 1:
The stabilizing ring acts as an intermediary that decouples the balancing weights from direct attachment to the fan wheel's outer diameter. This intermediary structure reduces the sensitivity to weight tolerances by providing a stable, pre-defined attachment geometry that compensates for manufacturing variations in the weights themselves.
3Stability of the object's composition
If a ring is provided on the outer diameter of the fan wheel for stabilization, then the fan wheel stability is improved, but the risk of deformation or damage to the wings increases when attaching balancing weights
Solution Approach 1:
The stabilizing ring is positioned radially inward from the outer diameter, creating a dimensional separation between the stabilization function and the blade attachment zones. This allows the ring to provide stabilization without interfering with the structural integrity of the blades, eliminating the risk of deformation or damage to the wings during balancing weight attachment.
Solution Approach 2:
The stabilizing function is localized to a specific radial position (inward from the outer diameter) rather than being distributed across the entire outer circumference. This localized approach allows different regions of the fan wheel to maintain their specific functions: the ring provides stabilization while the outer blade areas remain free from deformation risks.
4Measurement precision
If balancing weights are attached to smooth peripheral rings, then balancing is achieved, but the brackets can be shifted in position when the fan wheel accelerates
Solution Approach 1:
The ring is pre-profiled with defined fastening positions (such as sawtooth patterns) during manufacturing. This preliminary action creates predetermined attachment points that inherently prevent circumferential shifting of balancing weights during operation, eliminating the need for additional anti-shift mechanisms.
Data Source
Figure 1~2
AI summary
The fan impeller (1) has a hub (2) with several vanes (4) extending radially out from it, and a ring (7) installed co-axially with the hub and radially between the hub and outside diameter of the impeller. The ring has several defined fastening positions distributed over its circumference for the attaching of at least one balance weight. The fastening positions are formed by a profiling (9) of the ring which is provided exclusively between the spaced apart vanes.