Centrifugal Fan Trough Channel Depth Optimization
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Solution Overview
Problem
Centrifugal fans face inefficiencies in air flow management due to limitations in housing design, particularly in how air is channeled and redirected, leading to suboptimal performance and increased size requirements.
Innovation Solution
A centrifugal fan design featuring a trough-shaped channel in the rear housing section that increases in depth more than twice the width over a 90° range, with a linear increase in depth and minimal width expansion, allowing for efficient air redirection from a circumferential to axial path, minimizing the fan housing's diameter while maintaining effective air flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If air is channeled through a conventional housing design, then air flow can be redirected, but the fan housing diameter becomes too large
Solution Approach 1:
The channel depth increases in the axial direction (third dimension) rather than increasing the radial width (second dimension). This dimensional transition allows air flow redirection while maintaining a compact fan housing diameter, as the channel utilizes the axial space to achieve the necessary flow path length.
Solution Approach 2:
The channel depth parameter changes significantly (increases by more than twice the width increase over a 90° range) while the width parameter remains relatively stable. This parameter optimization allows efficient air flow management within a compact radial envelope, resolving the contradiction between housing size and flow efficiency.
2Productivity
If the channel depth increases significantly, then air flow efficiency improves, but the channel width must be controlled to maintain compact size
Solution Approach 1:
The channel cross-section has non-uniform geometry where depth varies significantly along the flow path while width remains controlled. The local quality of the channel cross-section changes from shallow and wide to deep and narrow, optimizing flow efficiency in the axial direction while maintaining compact radial dimensions.
Solution Approach 2:
Instead of increasing channel width (radial dimension) to improve flow capacity, the design increases channel depth (axial dimension). This dimensional shift allows the channel to accommodate greater flow volumes while maintaining a compact radial footprint, effectively decoupling flow efficiency from radial size.
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
This design enhances air flow efficiency by ensuring uniform rearward air movement with minimized radial widening, achieving improved performance in a compact fan housing structure.
Implementation Method 1
An impeller in the chamber is configured to rotate about the axis to drive the air radially outward
Implementation Method 2
A trough-shaped channel in the rear section extends circumferentially about the axis from a first end of the channel to a second end of the channel. The channel is configured to channel the air away from the first end circumferentially toward the second end.
Data Source
AI summary
A fan includes a fan housing located on an axis. The apparatus has axially front and rear sections that together define a chamber. Air can enter the chamber through an inlet in the front section. An impeller in the chamber is configured to rotate about the axis to drive the air radially outward. A trough-shaped channel in the rear section extends circumferentially about the axis from a first end of the channel to a second end of the channel. The channel is configured to channel the air away from the first end circumferentially toward the second end. The axially extending depth of the channel increases from the first end toward the second end such that, over a 90° range, an increase in the depth is more than twice an increase in the radially extending width of the channel.