Annular Blade Fan Noise Reduction via Shearing Force
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Solution Overview
Problem
Conventional fans generate high-frequency noise due to friction, which can be uncomfortable for users and may damage electronic devices by failing to dissipate heat effectively.
Innovation Solution
A fan design featuring a frame, impeller, and motor with annular blades stacked perpendicular to the hub, utilizing shearing force to induce airflow, and spacers between blades to reduce noise and increase air pressure, while maintaining operation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional fan blades are used to generate airflow by friction, then the fan can achieve basic airflow generation, but it produces high-frequency noise that causes user discomfort
Solution Approach 1:
The patent changes the fundamental operating parameter of the blades from friction-based airflow generation to shearing force-based airflow generation. By modifying the blade structure to annular rings with specific thickness (≤0.2mm) and arranging them in a stacked configuration, the blades utilize shearing force of the air to induce airflow, thereby eliminating high-frequency noise while maintaining airflow generation capability
Solution Approach 2:
The patent transitions from conventional single-plane blades to multi-layer stacked annular blades arranged along the axial direction. This dimensional change from two-dimensional to three-dimensional blade arrangement enables the use of shearing force mechanism, which operates differently from traditional friction-based airflow generation, thus reducing noise while preserving productivity
2Temperature
If conventional thick blades are used for airflow generation, then structural strength is sufficient, but noise levels increase and heat dissipation performance decreases
Solution Approach 1:
The patent specifies a precise thickness parameter for the annular blades (≤0.2mm), which is significantly thinner than conventional blades. This parameter change enables the blades to operate via shearing force rather than friction, simultaneously reducing noise and improving heat dissipation effectiveness by allowing better airflow penetration and heat transfer
3Object-affected harmful factors
If blade thickness is reduced to decrease noise, then high-frequency noise is reduced, but structural strength may be compromised
Solution Approach 1:
The patent employs spacers made of different material properties than the annular blades, creating a composite structure. The spacers provide structural support and spacing functionality, while the thin annular blades (≤0.2mm) achieve noise reduction. This composite approach allows the use of thin blades without compromising overall structural strength
Solution Approach 2:
The spacers act as intermediary elements between the thin annular blades. These spacers provide the necessary structural support and maintain the stacked arrangement, enabling the use of extremely thin blades for noise reduction while the spacers themselves bear the structural load, thus decoupling the strength requirement from the blade thickness
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 fan design significantly decreases high-frequency noise and increases air pressure, enhancing heat dissipation without compromising performance, thus protecting electronic devices and user comfort.
Implementation Method 1
the fan of this disclosure can induce the airflow by the shearing force
Data Source
AI summary
A fan impeller includes a hub, a plurality of annular blades, and a plurality of spacers. The annular blades are stacked along an axial direction of the hub and disposed around the outer periphery of the hub. The extension directions of the annular blades are perpendicular to the axial direction of the hub. Each of the spacers is disposed between the two adjacent annular blades. Each of the annular blades has an inner periphery. A gap is provided between the inner periphery and the hub. Each of the annular blades further includes a plurality of spokes and an inner ring, the inner ring is disposed on and connected to the outer periphery of the hub, and two ends of the spoke are connected to the inner periphery and the inner ring of the annular blade. The spacers are separately disposed on the inner rings of the annular blades, respectively.