Lateral Aerator Fin Layout for High-Airflow Duct Extraction
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Solution Overview
Problem
Existing lateral air outlets in air ducts face challenges in efficiently extracting a large quantity of air while maintaining directivity and minimizing disturbance to the airflow, leading to reduced flow rates and increased resistance, which necessitates more powerful fans and section reductions downstream.
Innovation Solution
A lateral air outlet design with multiple aligned slots and fins, where each fin's guide face is inclined to deflect air, allowing for a progressive increase in angle and width, minimizing flow disturbance and enabling multiple outlets without downstream section reductions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lateral air outlets are arranged to take a large quantity of air from the duct, then the air intake quantity is improved, but the disturbance to the downstream airflow increases significantly
Solution Approach 1:
The lateral air outlet is divided into multiple slots (at least three) aligned along the duct axis, with multiple fins having progressively increasing angles. This segmentation allows the air intake function to be distributed across multiple elements, reducing the disturbance caused by each individual element while maintaining high total air intake quantity.
Solution Approach 2:
Each fin has a different angle of inclination relative to the duct axis, creating local variations in air deflection. The fins progressively increase in angle from upstream to downstream, allowing each local element to handle a portion of the air intake while the progressive angle variation ensures smooth flow transition and minimizes overall disturbance to the downstream airflow.
2Device complexity
If multiple lateral air outlets are arranged in close proximity, then the device complexity is reduced, but the flow resistance in the duct increases
Solution Approach 1:
The air outlet system uses multiple slots and fins arranged in close proximity along the duct, replacing what would traditionally require multiple separate outlet assemblies. This segmented design reduces device complexity while the progressive fin angles minimize flow resistance by creating smooth flow transitions between adjacent elements.
Solution Approach 2:
The fins are positioned and angled to preliminarily guide and deflect air in a controlled manner before the air reaches subsequent fins. This preliminary action of air guidance by each fin reduces turbulence and flow resistance that would otherwise occur when multiple outlets are placed in close proximity.
3Shape
If the fin angles are increased to achieve 90° deflection, then the air jet directivity is improved, but the capacity of downstream outlets to take in air is significantly reduced
Solution Approach 1:
Different fins have different angles of inclination, creating local variations in air deflection angles. The first fin has a smaller angle (10°-35°) to minimize disturbance, while subsequent fins have progressively larger angles, with the last fin achieving high deflection (60°-85°). This local quality variation allows each fin to perform its specific function while maintaining overall system productivity.
Solution Approach 2:
The air deflection function is segmented across multiple fins with progressively increasing angles. Rather than using a single fin at 90°, the deflection is achieved progressively through multiple elements, allowing downstream fins to still access sufficient airflow while achieving the desired jet directivity.
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 design achieves a significant air intake with satisfactory deflection angles while minimizing flow disturbance, allowing for multiple outlets to be placed closely without reducing the air duct's cross-section, maintaining efficiency and flow rates.
Implementation Method 1
each fin being capable of deflecting a part of the air flowing in the air duct and to guide it to the respective slot
Data Source
Figure 1~3
Figure 4~6
Figure 7~8
AI summary
The invention concerns a lateral aerator (2) for a ventilation duct (1), comprising blowing openings (5, 5') each formed by a slot (3, 3') and a fin (4, 4') having a guiding face (4a, 4'a). According to the invention: a central axis (DTH) of each guiding face (4a, 4'a) is inclined in an upstream direction, the central axis (DTH) of the guiding face (4a, 4'a) of each of the first and last fins (4, 4') is inclined at an angle of between 10° and 35° and between 60° and 85°, the angle of inclination of the central axes (DTH) of the guiding faces (4a, 4'a) of the second fin to the penultimate fin (4; 14) increases gradually, and the width of the guiding face (4a, 4'a) of each of the second to the last fins (4'; 14') is greater than or equal to that of the fin (4; 14) immediately upstream.