Non-Circular Fan Structure Reducing Vibration
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Solution Overview
Problem
Conventional parallel fan structures experience increased vibration and noise due to resonance and dipole-dipole interactions, and are costly to manufacture.
Innovation Solution
A fan structure with a non-circular circumference design featuring a frame, hubs, a transmission belt member with blades, and assembling members, which rotates along a non-circular path to reduce resonance and noise, and omits unnecessary components like the stator unit and magnetic element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional parallel fan structure with multiple parallelly arranged fans is used, then airflow generation capability is improved, but vibration increases due to resonance and dipole-dipole interaction
Solution Approach 1:
The patent applies asymmetry by using fan frames with non-circular circumferences (e.g., elliptical, rectangular, or other polygonal shapes) instead of conventional circular frames. This asymmetric geometry causes the fans to operate at different instantaneous speeds during rotation, breaking the synchronous vibration patterns and dipole-dipole interactions that occur in parallel circular fans, thereby reducing overall vibration while maintaining airflow generation capability
2Productivity
If conventional parallel fan structure with multiple parallelly arranged fans is used, then airflow generation capability is improved, but noise increases due to dipole-dipole interaction
Solution Approach 1:
The non-circular fan frame geometry creates asymmetric airflow patterns and varying rotational speeds that disrupt the coherent dipole-dipole noise interactions. The irregular circumference causes different portions of the fan blades to move at different speeds relative to the frame, scattering the noise frequencies and reducing the intensity of dipole noise generation while still achieving effective airflow
3Reliability
If conventional parallel fan structure is used, then cooling performance is improved, but material and production costs increase
Solution Approach 1:
The patent merges multiple fan functions into a single non-circular fan frame structure. By designing the frame itself with the non-circular circumference and integrating the blade attachment structure directly into the frame, the invention eliminates the need for separate circular frames and reduces the number of components required, thereby lowering material usage and assembly complexity while maintaining effective cooling performance
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 design significantly reduces vibration and noise while lowering material and production costs by eliminating the need for certain components and mitigating resonance and dipole noise.
Implementation Method 1
due to a pressure difference between upper and lower surfaces of the blades on the transmission belt member, air at an air inlet of the frame is sucked into the receiving space in the frame and then flows out of the frame via an air outlet
Data Source
AI summary
A fan structure with non-circular circumference includes a frame, a first hub, a second hub, a transmission belt member, a first assembling member and a second assembling member. A first and a second base are provided in and protruded from a bottom of the frame. The first and the second hub are respectively mounted on the first and the second base, and a stator unit is provided between the first hub and the first base. The transmission belt member is fitted around side walls of the first and second hubs, and has a plurality of blades spaced on an outer surface thereof. The first and the second assembling member are correspondingly assembled to the tops of the first and the second hub. With the above arrangements, the fan structure can operate with largely reduced vibration and noise and can be manufactured at reduced material and production costs.