Serial Diagonal Fan Noise Reduction via Embedded Spoiler
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Solution Overview
Problem
Existing axial fans produce excessive noise due to high airflow, which is a disadvantage in modern system equipment where noise reduction is a priority.
Innovation Solution
A serial-type diagonal fan assembly is designed with a second fan featuring a spoiler embedded within, where the first and second fans are arranged in series, and the second fan's hub and base configuration increases the axial cross-sectional area, allowing for a diverged circular conical surface and positioning groove to accommodate the spoiler, reducing noise by introducing a tail flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If axial fan is used for high airflow, then air flux is increased, but noise is increased
Solution Approach 1:
The fan assembly is divided into multiple fan units (first fan, second fan, third fan) arranged in series, each handling a portion of the airflow. This segmentation allows the system to achieve high total air flux while each individual fan operates at lower noise-generating speeds, thus resolving the contradiction between productivity and noise generation.
Solution Approach 2:
The invention transitions from a single-axis axial fan to a multi-stage diagonal fan arrangement where airflow progresses through multiple stages in series. This dimensional change in the flow path allows the system to maintain high overall productivity while distributing the work across multiple lower-noise stages, effectively managing the noise-productivity trade-off.
2Object-generated harmful factors
If multiple fans are arranged in series, then noise is reduced, but device complexity is increased
Solution Approach 1:
Multiple fan units are merged into a single integrated assembly with shared housing, common mounting structure, and unified airflow path. This merging approach reduces the overall complexity compared to installing separate fan units, while still achieving the noise reduction benefits of series arrangement. The fans share common structural elements and are positioned to form a compact diagonal configuration.
Solution Approach 2:
The common housing and structural elements serve multiple functions: they provide structural support for all fan units, guide airflow through each stage, reduce overall assembly complexity, and contribute to noise dampening. This multi-functionality reduces the need for separate components, thereby managing device complexity while achieving noise reduction.
3Strength
If hub cross-sectional area is increased, then structural strength is improved, but device volume is increased
Solution Approach 1:
The hub is designed with a curved, spheroidal cross-section rather than a simple cylindrical or rectangular shape. This curved geometry provides enhanced structural strength and rigidity to support the diagonal fan arrangement and high airflow forces, while being more volume-efficient than straight geometric forms. The optimized curvature distributes stresses more effectively, maintaining strength with reduced material volume.
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 solution effectively reduces noise, particularly high-frequency noise, while enabling operation at higher speeds with increased air flux within noise limitations.
Implementation Method 1
the spoiler is not protruded from the second front fan frame... the spoiler embedded in the second fan for introducing a tail flow
Data Source
AI summary
A serial-type diagonal fan assembly having a first fan and at least one second fan is provided. The first fan has a first front fan frame and a first fan wheel. A first hub of the first fan wheel has a radial cross-sectional area increased from a top toward a bottom of the first hub. The second fan has a second front fan frame and a second fan wheel, the second hub of the second fan wheel has an axial cross-sectional area increased from a top to a bottom of the second hub. The first fan and the second fan are arranged in a series. A spoiler is arranged on a second air inlet of the second front fan frame, an outer edge of the spoiler is embedded in a positioning groove of the second front fan frame without protruding from the second front fan frame.