Fan Impeller Blade Recess Layout for High-Speed Stress Control
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Solution Overview
Problem
Existing impellers face increased mechanical stress and weight with higher rotational speeds, leading to increased energy consumption without a corresponding increase in material usage.
Innovation Solution
The impeller design features an edge recess in the outer edge of the blades, reducing stiffness but minimizing internal stresses, allowing for higher rotational speeds without additional material thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If higher wall thicknesses are used to increase stability and strength, then the impeller can withstand higher mechanical stress, but the impeller becomes heavier and more expensive
Solution Approach 1:
The patent applies local quality by introducing an edge recess specifically at the outer edge of the impeller blades where stress concentration occurs during rotation. This localized geometric modification reinforces the high-stress area without requiring increased wall thickness throughout the entire blade structure, thereby maintaining strength while reducing weight.
2Strength
If higher wall thicknesses are used to increase stability and strength, then the impeller can withstand higher mechanical stress, but the manufacturing cost increases
Solution Approach 1:
The edge recess is a localized geometric feature that can be integrated into the blade manufacturing process without requiring additional materials or complex assembly steps. This approach achieves enhanced strength at critical locations while avoiding the increased material costs associated with uniform wall thickness increases.
3Adaptability or versatility
If the impeller is accelerated for changing the rotational speed, then the fan can adapt to different operating conditions, but the energy consumption increases
Solution Approach 1:
The edge recess modifies the aerodynamic parameters of the impeller blades, optimizing the flow characteristics and reducing turbulence. This allows the impeller to maintain efficient operation across a wider range of rotational speeds, reducing the energy penalty associated with acceleration and speed changes.
Data Source
AI summary
The present disclosure refers to an impeller having two support parts and multiple impeller blades that are arranged between the two support parts and that are connected along a first longitudinal edge with the first support part and along a second longitudinal edge with the second support part. An outer edge of each impeller blade connects the two longitudinal edges, and comprises an edge recess, where the outer edge has a local low point. The position of low point is closer to the support part in which higher internal stresses or loads occur during operation of the impeller.