Duct section for an air movement duct
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Solution Overview
Problem
Existing air movement duct systems lack controlled guidance of air flow, particularly when deflection is required, as they fail to effectively manage the combination of primary and secondary air flows and do not provide a method to pivotally adjust the louvres for directed air dispersal.
Innovation Solution
A duct section with a peripheral air inlet for secondary air entrainment by primary air flow, featuring a pivotable guide vane nozzle with elongate vanes arranged transversely across the duct, allowing angular adjustment to deflect and guide combined air flows efficiently, utilizing a venturi effect and aerodynamic profiles to minimize turbulence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If curved louvres are mounted at the duct outlet to direct air flow, then air flow direction can be adjusted, but the mechanism for pivotal mounting and connection between louvres is not provided, resulting in uncontrolled air flow guidance
Solution Approach 1:
The patent applies the dynamics principle by making the guide vane arrangement pivotable about an axis substantially aligned with the periphery of the duct section. This allows the vanes to be inclined at adjustable angles to the flow direction of combined air flows, enabling dynamic control of air flow deflection while maintaining a relatively simple structural implementation.
2Productivity
If secondary air is drawn in through peripheral air inlet to form combined air flow, then air movement efficiency is improved, but the interaction between primary and secondary air flows requires precise nozzle positioning and guide vane arrangement
Solution Approach 1:
The guide vane arrangement acts as an intermediary element between the primary and secondary air flows. The vanes are positioned to receive the combined air flow from the peripheral air inlet and guide it in the desired direction, mediating the interaction between the two air flows and reducing the need for extremely precise positioning of the nozzle and vanes.
3Adaptability or versatility
If the nozzle is made pivotable to deflect air flows, then air distribution directionality is improved, but the structural complexity of the pivotable nozzle mechanism increases
Solution Approach 1:
The guide vane arrangement serves multiple functions: it guides the combined air flow from the peripheral air inlet, enables pivotable deflection of air flows in various directions, and can be inclined at different angles to the flow direction. This multi-functionality reduces the need for separate components for each function, thereby limiting the increase in structural complexity while improving adaptability.
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 enables controlled and efficient air flow deflection and guidance, enhancing air movement efficiency by leveraging the venturi effect and aerodynamic profiles to manage both primary and secondary air flows, improving the overall air distribution and directionality.
Implementation Method 1
a peripheral air inlet through which a secondary air flow is drawn into the duct section by entrainment by the passing primary air flow to form a combined air flow
Implementation Method 2
the guide vanes are elongate and arranged to be pivotable about their longitudinal dimension transverse to the direction of the air movement... the nozzle being pivotable about an axis substantially aligned with the periphery of the duct section to incline the vanes at an angle to the flow direction of the combined air flows to deflect and guide the airflows
Data Source
Figure 1~2
Figure 3~4
AI summary
A duct section 1 for an air movement duct, has a duct inlet section 2 for a fan driven primary air flow 3, the duct section 1 further having a peripheral air inlet 5 through which a secondary air flow is drawn into the duct section 1 by entrainment by the passing primary air flow to form a combined air flow of both the primary and the secondary air flows. A nozzle 4 comprising a guide vane arrangement 6 is located downstream of the peripheral air inlet 5 so as to be impinged by and to direct the combined air flows.