Radial Fan Impeller Monolithic Design Noise Reduction
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Solution Overview
Problem
Existing radial fan impellers face challenges in achieving high efficiency and low noise operation while being manufactured as a single monolithic piece, with previous designs often compromising on performance due to differences in disc diameters and opening configurations.
Innovation Solution
The impeller design features a larger outer diameter for the annular covering disc compared to the support disc, with openings between the disc edges and radially extending blades, allowing for a balanced axial surface area ratio and conically shaped openings to enhance manufacturing and operational efficiency and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the annular covering disc has a smaller outer diameter than the support disc (prior art design), then the impeller can be manufactured as one monolithic piece, but the efficiency and noise performance are compromised
Solution Approach 1:
The patent merges the annular covering disc and support disc into a single monolithic impeller structure, eliminating the need for separate manufacturing and assembly steps while optimizing the covering disc to extend beyond the support disc perimeter for improved aerodynamic performance and noise reduction
Solution Approach 2:
The patent extends the annular covering disc in the radial dimension beyond the support disc perimeter, creating an overhanging portion that improves gas/air mixing and reduces noise without compromising manufacturability
2Ease of manufacture
If the annular covering disc has a smaller outer diameter than the support disc (prior art design), then the impeller can be manufactured as one monolithic piece, but the noise during operation increases
Solution Approach 1:
The patent merges the annular covering disc and support disc into a single monolithic impeller structure, eliminating the need for separate manufacturing and assembly steps while optimizing the covering disc to extend beyond the support disc perimeter for improved aerodynamic performance and noise reduction
Solution Approach 2:
The patent extends the annular covering disc in the radial dimension beyond the support disc perimeter, creating an overhanging portion that improves gas/air mixing and reduces noise
3Productivity
If the annular covering disc outer diameter is larger than the support disc outer diameter, then efficiency and noise performance are improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the annular covering disc and support disc into a single monolithic impeller structure, eliminating the need for separate manufacturing and assembly steps while optimizing the covering disc to extend beyond the support disc perimeter for improved aerodynamic performance and noise reduction
Data Source
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AI summary
Impeller (10) for a radial fan, the impeller (10) comprising a front side (11), a rear side (12) and a peripheral edge (13), a hub element (14), an annular covering disc (16) positioned on the front side (11), an intake opening (17) formed on the front side (11), a support disc (19) positioned on the rear side (12), blades (15) extending substantially radially from the hub element (14) towards the peripheral edge (13), and outflow openings (18) formed in the region of the peripheral edge (13). A first outer diameter (d16o) of a radially outer edge (16o) of the annular covering disc (16) is greater than a second outer diameter (d19o) of a radially outer edge (19o) of the support disc (19). Openings (20) are formed in the annular covering disc (16), wherein the openings (20) are positioned between the radially outer edge (16o) of the annular covering disc (16) having the first outer diameter (d16o) and a radially inner edge (16i) of the annular covering disc (16) having a first inside diameter (d16i).