Fan Wheel Edge Inclination for Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fan wheels face challenges in minimizing design-related influences on noise behavior and aerodynamic efficiency, particularly when installed in devices, and are costly to produce due to complex configurations.
Innovation Solution
A fan wheel design featuring a base disk and cover disk with radially protruding edge sections inclined at specific angles (α1 and β1) allows for adjustable outflow directions, reducing noise and efficiency deterioration, and enabling simpler injection molding with reduced undercuts and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the base disk and cover disk have radially protruding edge sections with specific inclination angles, then the outflow direction can be adjusted to minimize noise and improve aerodynamic efficiency, but the device complexity increases due to additional angular parameters
Solution Approach 1:
The patent applies parameter changes by modifying the inclination angles α1 and β1 of the base disk and cover disk edge sections. By varying these angular parameters within specific ranges, the outflow direction is adjusted to optimize noise behavior and aerodynamic efficiency without fundamentally changing the overall fan wheel structure.
Solution Approach 2:
The patent implements local quality by applying the inclination angles only to specific edge sections of the base disk and cover disk, rather than the entire structure. This localized modification allows for targeted control of flow direction at the outlet while maintaining the simplicity of the overall design.
2Object-affected harmful factors
If the base disk and cover disk have radially protruding edge sections with specific inclination angles, then the outflow direction can be adjusted to minimize noise and improve aerodynamic efficiency, but the manufacturing costs increase due to complex configurations
Solution Approach 1:
The patent uses parameter changes by defining specific ranges for angles α1 and β1 that optimize aerodynamic efficiency while remaining manufacturable. By constraining these parameters within practical limits, the design achieves performance goals without requiring complex manufacturing processes.
Solution Approach 2:
The patent applies dynamics by making the outflow direction adjustable through the inclination angles, allowing the fan wheel to adapt to different installation situations and device configurations, thereby optimizing aerodynamic efficiency across various applications without requiring multiple specialized designs.
3Object-affected harmful factors
If the angles α1 and β1 are optimized for noise reduction and efficiency, then the outflow direction deviates from radial direction, but the manufacturing complexity increases due to non-standard geometries
Solution Approach 1:
The patent applies parameter changes by selecting inclination angles that balance noise reduction performance with manufacturability. The angles are chosen to achieve flow direction control while maintaining geometries that are compatible with standard injection molding processes.
Solution Approach 2:
The patent implements this principle by designing the fan wheel as a single-piece injection molded component, eliminating the need for complex assembly processes. The design accepts certain geometric constraints to enable use of simpler, more cost-effective injection molding tools rather than expensive multi-component assembly systems.
4Ease of manufacture
If the fan wheel is designed as a single-piece injection molded component, then the manufacturing costs are reduced, but the design flexibility for complex geometries is limited
Solution Approach 1:
The patent merges the base disk, cover disk, and blade ring into a single-piece injection molded component. This integration eliminates assembly requirements and reduces manufacturing costs while the design incorporates essential geometric features needed for flow control through the inclination angles.
Solution Approach 2:
The patent achieves universality by designing a fan wheel that can be adapted to different installation situations through the adjustable inclination angles, allowing a single basic design to serve multiple applications with varying noise and efficiency requirements without requiring complex geometric variations.
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
The adjustable outflow direction and optimized edge section angles minimize noise and aerodynamic inefficiencies while reducing production costs by allowing for symmetrical or asymmetrical installation and using simple injection molding tools.
Implementation Method 1
The bottom disc edge section is inclined at an angle α1 relative to a continuous extension of a radially inwardly immediately adjacent section of the bottom disc, and the cover disc edge section is inclined in an axial direction at an angle β1 relative to a continuous extension of a radially inwardly immediately adjacent section of the cover disc, wherein the angles α1 and β1 lie in a range of values from -π/2 ≤ α1 ,β1 ≤ π/2, so that a flow direction of the conveyed medium deviating from a radial outflow can be adjusted.
Data Source
Figure 1~2
AI summary
A fan wheel (1) comprising a base disc (3) and a cover disc (2) that has an axial inlet opening, and a blade ring arranged between the base disc (3) and the cover disc (2) and formed from fan wheel blades (4) to convey a conveyed medium, wherein the base disc (3) has a base disc edge section (6), which radially projects beyond an outer edge (7) of the blade ring, said outer edge being adjacent to the base disc (3), and the cover disc (2) has a cover disc edge section (5), which radially projects beyond an outer edge (8) of the blade ring, said outer edge being adjacent to the cover disc (2), wherein the base disc edge section (6) is inclined by an angle α in an axial direction with respect to a continuous extension (10) of a section of the base disc (3) that is directly adjacent radially inwards, and the cover disc edge section (5) is inclined by an angle ß in an axial direction with respect to a continuous extension (11) of a section of the cover disc edge section (2) that is directly adjacent radially inwards.