Vehicle Ventilation Valve Tapered Wall Airflow
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Solution Overview
Problem
Existing ventilation valves for vehicles suffer from air resistance issues due to fluttering valve flaps and the formation of 'dead water zones' that impede airflow efficiency, particularly at sharp edges and in the presence of water accumulation.
Innovation Solution
The ventilation valve features an inclined wall surrounding the through opening, which tapers in the main flow direction to reduce air resistance, and includes a water drainage channel and rounded edges and ribs to prevent vortex formation and water ingress, along with arrow-shaped mounting pins and centering pins for improved airflow and attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve flaps are made flexible to close the opening effectively, then sealing performance is improved, but fluttering occurs and noise is generated
Solution Approach 1:
The valve flap edges are rounded instead of sharp, which reduces turbulence and fluttering when air flows through the opening. The rounded geometry allows smoother air passage while maintaining the sealing function of the flexible valve flap.
2Ease of manufacture
If the wall bounding the through opening is made with sharp edges for structural simplicity, then manufacturing is easier, but dead water zones form and air resistance increases
Solution Approach 1:
The wall bounding the through opening incorporates rounded edges and curved surfaces instead of sharp angles. This curvature eliminates dead water zones where air would otherwise stagnate, reducing air resistance and improving overall airflow efficiency while remaining manufacturable.
3Productivity
If the through opening is kept large for ventilation efficiency, then air flow is improved, but water infiltration risk increases
Solution Approach 1:
The rounded wall geometry creates a tapered through opening that naturally directs water droplets away from the valve flap area. The curved surfaces prevent water accumulation and guide it toward drainage paths, allowing a larger opening for ventilation while reducing water infiltration risk.
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 enhances airflow efficiency by reducing air resistance, suppressing fluttering, and preventing water entry into the vehicle interior, thereby ensuring more efficient air conduction and reliable water drainage.
Implementation Method 1
The valve flaps here are arranged in such a manner that they are held in the closed position by gravity
Implementation Method 2
By means of a positive pressure occurring in the vehicle interior, the valve flaps are deformed counter to gravity
Implementation Method 3
The opening cross section of the through opening is reduced in the main flow direction... the air resistance for the air flow emerging from the ventilation valve is reduced, which can be attributed in particular to an increase in the flow velocity of the air flow
Implementation Method 4
The inclined wall prevents dead water zones in the air flow... the formation of vortex zones increasing the air resistance occur
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A ventilation valve (10) for a vehicle for letting air out of a vehicle interior, comprising a valve frame (12) with at least one through opening (14), and at least one valve flap (20) which is mounted on the valve frame (12) and is adjustable between a closed position and an open position, wherein the at least one valve flap (20) closes the at least one through opening (14) in the closed position and opens up the at least one through opening (14) in the open position, wherein air escaping through the at least one through opening (14) flows from an air inlet side (13.1) to an air outlet side (13.2) along a main flow direction (H), wherein a wall (16a) bounding the at least one through opening (14) is inclined into the air flow in such a manner that the at least one through opening (14) tapers in the main flow direction (H).