Segmented Circular Fan Blade for Low-Noise, Low-Burr Molding
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Solution Overview
Problem
Existing fan blades with circular tips have complex structures that are difficult to produce using molds, leading to high production costs and poor performance due to burrs and aerodynamic noise.
Innovation Solution
The fan blade design features a circular shape with a first segment part that includes non-overlapping first inner and outer annular surfaces, allowing for molding with two molds and reducing the number of molds needed, thereby minimizing burrs and complexity, and enhancing aerodynamic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular blade structure is used to lower noise, then noise reduction is achieved, but the structure becomes complex and difficult to produce with molds
Solution Approach 1:
The circular blade is divided into multiple segments (first circular segment, second circular segment, third circular segment, fourth circular segment) that can be produced separately using standard molds. Each segment has a simplified geometry that is easy to manufacture, yet when assembled together they form the complete circular blade structure that achieves noise reduction.
2Reliability
If multiple molds are used to produce complex end parts, then production completeness is achieved, but mold complexity and cost increase
Solution Approach 1:
The blade end part is segmented into multiple independent circular segments that can be produced using standard single-cavity or multi-cavity molds. This eliminates the need for complex multi-directional demolding mechanisms while ensuring complete production of all blade components.
Solution Approach 2:
Multiple blade segments are merged through assembly to form the complete circular blade. This allows each segment to be produced with simple molds while achieving the complex circular blade structure through combination of simpler components.
3Reliability
If multiple molds are used to mold the end part, then complete production is achieved, but burrs are formed and aerodynamic performance deteriorates
Solution Approach 1:
The blade is divided into segments that can be produced with simple molds, avoiding the need for complex multi-directional demolding that causes burrs. Each segment has smooth surfaces suitable for aerodynamic performance.
Solution Approach 2:
Instead of trying to mold the entire complex circular blade in one piece (which causes burrs), the design accepts segmentation as a solution. The segments are designed with features that facilitate clean separation and assembly without burr formation, converting the potential harm of segmentation into the benefit of simplified manufacturing.
4Object-affected harmful factors
If a complex circular blade structure is used, then noise reduction is achieved, but production cost increases
Solution Approach 1:
The circular blade is segmented into standardizable components that can be produced using conventional molds. This reduces tooling costs while maintaining the noise-reducing circular geometry through assembly of simpler parts.
Data Source
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AI summary
The present application provides a fan blade and an air supply device, and relates to the technical field of air supply devices. The fan blade comprises: a hub; a blade connected to the circumferential side face of the hub, wherein the blade presents a circular shape, the inner annular surface of the blade encloses a hollow area, or the inner annular surface of the blade and the circumferential side face of the hub enclose a hollow area; in the radial direction of the hub, an end of the blade connected to the hub is the root part of the blade, and an end thereof away from the hub is the end part of the blade; wherein, in a direction from the end part to the root part, at least a portion of the area of the blade is a first segment part, and the first segment part comprises a first inner annular surface and a first outer annular surface; in the axial direction of the hub, the first inner annular surface and the first outer annular surface turn direction at the end part, and the first inner annular surface and the first outer annular surface on both sides of the end part do not overlap.