Radial Fan Diffuser Plate Edge Angle Optimization
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Solution Overview
Problem
Radial fans in vacuum cleaners face challenges in reducing sound power levels and enhancing aerodynamic efficiency.
Innovation Solution
The design includes a diffuser plate with edge sections that form an angle of 50° to 65° relative to the radial direction, guiding the air flow radially outward and tangentially, and using guide channels to direct the air flow axially, reducing noise and increasing efficiency by minimizing deceleration and edge vortex formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the diffuser plate edge sections are oriented radially (0° to radial direction), then the manufacturing is simple, but the aerodynamic efficiency is poor and noise power level is high due to strong deceleration and edge vortex formation
Solution Approach 1:
The patent applies parameter changes by optimizing the angle parameter of the diffuser plate edge sections. The edge sections are designed to form an angle of 10° to 70° (preferably 30° to 60°, most preferably 45°) relative to the radial direction. This angular parameter modification reduces the adverse effects of radial orientation (strong deceleration and edge vortex formation) while maintaining manufacturing feasibility, thereby reducing noise power level and improving aerodynamic efficiency.
2Ease of manufacture
If the diffuser plate edge sections are oriented radially (0° to radial direction), then the manufacturing is simple, but the aerodynamic efficiency is poor due to strong deceleration and edge vortex formation
Solution Approach 1:
The patent applies parameter changes by optimizing the angle parameter of the diffuser plate edge sections. The edge sections are designed to form an angle of 10° to 70° (preferably 30° to 60°, most preferably 45°) relative to the radial direction. This angular parameter modification reduces the adverse effects of radial orientation (strong deceleration and edge vortex formation) while maintaining manufacturing feasibility, thereby reducing noise power level and improving aerodynamic efficiency.
3Object-generated harmful factors
If the diffuser plate edge sections form an angle of 10° to 70° relative to the radial direction, then the aerodynamic efficiency is improved and noise is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by optimizing the angle parameter of the diffuser plate edge sections. The edge sections are designed to form an angle of 10° to 70° (preferably 30° to 60°, most preferably 45°) relative to the radial direction. This angular parameter modification reduces the adverse effects of radial orientation (strong deceleration and edge vortex formation) while maintaining manufacturing feasibility, thereby reducing noise power level and improving aerodynamic efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration results in a radial fan with improved aerodynamic efficiency and reduced noise emissions, particularly suitable for vacuum cleaners, by optimizing air flow guidance and minimizing noise-causing pressure fluctuations.
Implementation Method 1
The outer edge of the diffuser plate is designed such that at least one, in particular each, edge section exposed to the airflow forms an angle of at least 50° and at most 65° to a radial direction relative to the axis of rotation
Implementation Method 2
using guide channels to direct the air flow axially, reducing noise and increasing efficiency by minimizing deceleration and edge vortex formation
Data Source
Figure 1
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AI summary
A radial blower, particularly for a vacuum cleaner, comprises an impeller (2) rotatable about a rotational axis (9) and driven by a motor, the impeller having a plurality of blades (7) for generating an airflow directed at least partially radially outwards, and a stationary guide vane (3, 31) comprising a diffuser plate (13, 32, 48) arranged perpendicular to the rotational axis (9) adjacent to the impeller (2), an annular wall (14) radially surrounding the diffuser plate, and a hood (21) at least partially enclosing the impeller (2), wherein a continuous annular space (23) radially surrounding the impeller (2) is formed between the hood (21), the impeller (2), and the diffuser plate (13, 32, 48), and wherein a plurality of openings (33, 50) are formed between an outer edge of the diffuser plate (13, 32, 48) and the annular wall (14). is, which allow air to pass from the annular space (23) to the side of the diffuser plate (13, 32, 48) opposite the impeller (2),wherein the outer edge of the diffuser plate (13, 32, 48) in the area of each opening (33, 50) has at least one flow-facing edge section (34) and at least one flow-over edge section (35, 49), and wherein the at least one flow-facing edge section (34) forms an angle γ of at least 50° and at most 65° with a radial direction. This creates a radial fan, enabling a higher aerodynamic efficiency and/or a reduction in the overall sound power level.