Undulated Diffuser Blade Leading Edge for Lower Pressure Drop
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Solution Overview
Problem
Traditional HVAC diffusers have inefficient air distribution and high manufacturing costs due to their blade designs, which lead to increased pressure drops and noise in air flow, requiring more power to operate fans and blowers.
Innovation Solution
The introduction of a linear bar diffuser blade with an undulated surface enhancement along its leading edge, fabricated from sheet metal, which reduces pressure drops and noise by improving air flow velocity and pressure profiles, and is cost-effective to manufacture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional diffuser blades are used, then manufacturing cost is reduced, but air flow efficiency deteriorates due to increased pressure drops and noise
Solution Approach 1:
The patent applies curvature by forming the leading edge of the diffuser blade with a rounded contour having a radius of curvature between 0.02 inches and 0.06 inches. This curved leading edge design improves air flow efficiency by reducing pressure drops and noise compared to traditional sharp or flat leading edges, while still being manufacturable using standard sheet metal forming processes.
2Device complexity
If traditional diffuser blades are used, then device complexity is reduced, but energy consumption increases due to higher pressure drops requiring more fan power
Solution Approach 1:
The rounded leading edge with a controlled radius of curvature (0.02-0.06 inches) reduces air flow separation and turbulence, thereby decreasing pressure drops across the diffuser. This results in lower fan power consumption while maintaining a relatively simple blade geometry that does not significantly increase manufacturing complexity.
3Ease of manufacture
If traditional diffuser blades are used, then manufacturing simplicity is maintained, but air distribution performance deteriorates
Solution Approach 1:
The patent implements a rounded leading edge contour that can be formed using standard sheet metal rolling or bending operations. The radius of curvature (0.02-0.06 inches) is optimized to improve air distribution performance by reducing flow separation and noise, while still being compatible with conventional manufacturing processes that maintain manufacturing simplicity.
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 undulated surface enhancement on the diffuser blades reduces pressure drops and noise, leading to more efficient air distribution and lower energy consumption for HVAC systems, while maintaining cost-effectiveness.
Implementation Method 1
The undulated contour includes peaks and valleys extending into and out of the width of the blade... reduces pressure drops and noise by improving air flow velocity and pressure profiles
Data Source
AI summary
A linear bar diffuser includes a grille frame and blades in a stacked arrangement within the grille frame such that space is provided between adjacent blades to facilitate flow of an incoming air flow therethrough. One of the blades includes a leading edge configured to face the incoming air flow, the leading edge including an undulated contour extending along a length of the blade and into a width of the blade, the width of the blade extending transverse to the length and between the leading edge and a trailing edge of the blade.