Venturi-Actuated Rebate Ventilator Flap for Wind Regulation
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Solution Overview
Problem
Existing rebate ventilators for windows and doors lack effective control over airflow, particularly during strong winds, leading to undesirably high volume flows and inadequate regulation.
Innovation Solution
A rebate ventilator with a pivotable flap closing element arranged in a constriction of the air duct, utilizing the Venturi effect to regulate airflow by increasing flow velocity and reducing static pressure, which moves the flap towards the closed position, creating a self-regulating flow-limiting mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flow-limiting valve with a closing element is added to control airflow, then airflow regulation is improved, but device complexity increases
Solution Approach 1:
The closing element automatically regulates airflow based on wind conditions without external control. The element responds to pressure differences caused by wind, opening during calm conditions for ventilation and closing during strong winds, making the system self-regulating and eliminating the need for complex control mechanisms
Solution Approach 2:
The closing element is extracted as a separate, simple component within the ventilator structure. This modular approach allows the ventilation function and flow limitation function to be integrated while keeping the individual components simple and easy to manufacture
2Ease of operation
If a closing element is made fully automatic to respond to wind conditions, then ease of operation is improved, but control precision deteriorates
Solution Approach 1:
The closing element is designed to be dynamically responsive to wind conditions rather than statically fixed. The element automatically adjusts its position based on real-time pressure differences, providing continuous adaptation to changing environmental conditions while maintaining simple operation
Solution Approach 2:
The closing element incorporates automatic feedback through pressure-driven movement. The element responds to pressure differences caused by wind, opening during calm conditions for ventilation and closing during strong winds, providing self-regulating flow control based on real-time environmental feedback
3Adaptability or versatility
If the closing element is positioned to fully close the air duct, then flow limitation is improved, but air exchange capability deteriorates
Solution Approach 1:
The closing element dynamically adjusts its position based on wind conditions rather than remaining fixed in a fully closed or fully open state. During calm conditions, the element opens to allow ventilation; during strong winds, it closes to prevent excessive airflow, optimizing air exchange for each condition
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
This solution allows for a largely constant volume flow regulation, preventing excessive airflow while ensuring minimum air exchange and sound insulation, with the flap biased open by gravity or a spring for normal conditions and lockable positions for user control.
Implementation Method 1
the closing element is arranged in the area of a constriction of the air duct in such a way that it is moved in the direction of the closed position when there is a strong air flow due to the Venturi effect. The flow velocity of the air increases in the area of the constriction, which is accompanied by a reduction in static pressure
Implementation Method 2
EP 1 691 024 A2 discloses a rebate ventilator with a flow-limiting valve that includes a closing lip made of plastic. At high flow rates, the closing lip closes due to the Bernoulli effect
Data Source
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AI summary
A rebate ventilator for a window or door is designed for installation on a frame or sash of the window or door and defines an air duct for an airflow passing through a rebate of the window or door. At least one flow-limiting valve is arranged in the air duct, which includes a closing element movable between an open and a closed position. This closing element can be moved towards the closed position by a strong airflow. The closing element is positioned in the area of a constriction in the air duct such that, due to the Venturi effect, it is moved towards the closed position when a strong airflow occurs.