Forward Swept Centrifugal Fan Wheel Arcuate Blades
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Solution Overview
Problem
Conventional forward curved centrifugal fan wheels have limited operational stability and efficiency across varying airflow conditions, leading to unsteady airflow and excessive noise, which restricts design options and increases costs.
Innovation Solution
A forward swept centrifugal fan wheel with blades having a substantially continuous arcuate form and cross-section, extending along and parallel to the axis of rotation, providing a more aerodynamic and quieter operation compared to conventional designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional forward curved blades with straight edges are used, then the fan wheel is compact in size, but the airflow stability deteriorates and noise increases under varying airflow conditions
Solution Approach 1:
The patent applies curvature principle by replacing straight blade edges with continuous arcuate forms. The blades have a substantially continuous arcuate form extending along the axis parallel to the rotation axis, and each blade has a substantially continuous arcuate cross-section. This curved geometry improves airflow stability and reduces noise while maintaining the compact size advantage of forward curved fans.
2Device complexity
If conventional forward curved blades are used, then the fan wheel structure is simple, but the operating range is limited and efficiency deteriorates under extreme conditions
Solution Approach 1:
The continuous arcuate form and cross-section of the blades create a more aerodynamic shape that extends the stable operating range. The curved geometry allows the fan to maintain efficiency under both high and low airflow restriction conditions, doubling the viable operating regime compared to conventional straight-blade designs.
Solution Approach 2:
The patent changes the geometric parameters of the blades from straight edges to continuous arcuate forms. This parameter change in blade shape fundamentally improves the aerodynamic performance, allowing the fan to operate efficiently across a broader range of airflow conditions without increasing structural complexity.
3Ease of manufacture
If conventional straight-blade geometry is used, then manufacturing is straightforward, but aerodynamic performance and noise levels are suboptimal
Solution Approach 1:
The continuous arcuate form and cross-section of the blades create a more aerodynamic shape that reduces turbulence and noise generation. The curved geometry smooths airflow transitions, significantly reducing the harmful noise effects while remaining manufacturable through standard forming processes.
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 wheel achieves improved airflow stability and reduced noise, with a doubled operating regime and up to 10% efficiency improvement at higher flow rates, and a 4 dB decrease in sound intensity at 3000 CFM, enhancing performance and reducing costs.
Implementation Method 1
forward swept centrifugal fan wheel comprising a first endring, a second endring, a plurality of blades connected between the first endring and the second endring, each blade having a substantially continuous arcuate form extending along an axis parallel to an axis of rotation
Data Source
AI summary
A forward swept centrifugal fan wheel comprising a first endring (10), a second endring (11), a plurality of blades (12) connected between the first endring and the second endring, each blade having a substantially continuous arcuate form extending along an axis parallel to an axis of rotation (A-A), and each blade having a substantially continuous arcuate cross-section taken with respect to a plane which extends normally from the axis of rotation (A-A).