Curved Ventilation Element Design to Reduce Pressure Loss
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Solution Overview
Problem
Ventilation systems face inefficiencies due to flow resistance caused by curved elements, leading to increased pressure loss, which affects the overall performance of systems like fume hoods.
Innovation Solution
Designing a curved element with a minimum radius of curvature that is at least 1/10 of the flow cross-section's diameter, featuring a one-piece outer wall and guide elements to minimize flow resistance, and using an injection molding process for production, allowing for a cost-effective and error-reduced manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a curved element is used to deflect air flow in a ventilation system, then the routing can be adapted to structural conditions, but flow resistance increases causing pressure loss
Solution Approach 1:
The patent applies smooth curvature principles by ensuring the flow cross-section maintains a minimum radius of curvature (at least 1/10 of the minimum diameter) throughout the curved element. This prevents sharp corners and sudden directional changes that would cause flow separation and turbulence, thereby reducing pressure loss while maintaining the necessary routing adaptability.
2Volume of moving object
If the flow cross-section has a small radius of curvature, then the curved element can be more compact, but pressure resistance increases
Solution Approach 1:
The patent establishes a specific parameter relationship where the minimum radius of curvature r_min must be at least 1/10 of the minimum diameter d_min of the flow cross-section (r_min ≥ d_min/10). This parameter constraint optimizes the balance between compactness and pressure resistance, ensuring the curved element remains space-efficient while maintaining acceptable flow characteristics.
3Ease of manufacture
If multiple separate components are used to form the curved element, then manufacturing flexibility increases, but production complexity and errors increase
Solution Approach 1:
The patent integrates the outer wall and guide elements into a single monolithic component produced through injection molding. This merging of components eliminates assembly steps, reduces production complexity, and minimizes potential assembly errors while maintaining manufacturing flexibility through the versatility of injection molding technology.
4Ease of manufacture
If the flow cross-section is designed as a flat channel, then manufacturing is simpler, but flow resistance increases compared to round sections
Solution Approach 1:
The patent applies different geometric characteristics to different parts of the flow cross-section. The overall shape maintains a flat channel configuration for manufacturing simplicity, but the corners and edges are rounded with a minimum radius of curvature to reduce flow resistance. This local modification optimizes flow characteristics without requiring a complete redesign to a circular section.
Data Source
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AI summary
The invention relates to a curved element (11) for a ventilation system, comprising at least one oval opening (18) and a flow cross-section having a minimum radius of curvature which is at least as great as one tenth of the smallest diameter (dmin) of this flow cross-section.