Vehicle Vent Duct Structure for Noise Shielding and Airflow
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Solution Overview
Problem
Existing vehicle vent ducts allow noise to enter the cabin due to the swinging valve body, and increasing the valve body's mass to reduce noise decreases ventilation performance.
Innovation Solution
A vehicle vent duct design featuring a duct body with a sound insulation wall portion and a stopper to reduce noise entry, where the sound insulation wall is curved to match the valve body's trajectory and a branch wall portion is added for enhanced insulation, maintaining ventilation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the mass of the valve body is increased to reduce flapping, then noise entry is reduced, but ventilation performance deteriorates
Solution Approach 1:
The valve body is divided into multiple sections: a main body portion and a flap portion that can move independently. This segmentation allows the main body to provide structural stability for noise reduction while the flap portion maintains ventilation functionality, resolving the contradiction between noise reduction and ventilation performance.
Solution Approach 2:
Different portions of the valve body have different masses and properties. The main body portion has greater mass to reduce flapping and noise entry, while the flap portion is lighter to maintain responsive ventilation. This local differentiation of mass distribution allows simultaneous achievement of noise reduction and ventilation performance.
2Productivity
If the valve body is made lighter to maintain ventilation performance, then ventilation performance is maintained, but noise entry increases
Solution Approach 1:
By segmenting the valve body into main body and flap portions, the system achieves lightweight construction for good ventilation while the main body portion provides sufficient mass to reduce noise entry from flapping, even when the overall valve body mass is reduced.
Solution Approach 2:
The valve body exhibits asymmetric mass distribution where the main body portion is heavier than the flap portion. This asymmetric design allows the heavier main body to anchor the structure for noise reduction while the lighter flap maintains responsive ventilation, resolving the contradiction between weight and noise reduction.
3Productivity
If the insertion hole is shaped to allow significant swinging, then ventilation performance is improved, but noise entry increases
Solution Approach 1:
The insertion hole is shaped to accommodate the segmented valve body structure, allowing the flap portion to swing freely for ventilation while the main body portion remains relatively stable. This segmentation-compatible hole design enables both ventilation performance and noise reduction.
Solution Approach 2:
The shape parameters of the insertion hole are optimized to match the movement characteristics of the segmented valve body. The hole geometry allows sufficient swinging range for ventilation performance while constraining excessive flapping that would cause noise entry.
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
Effectively reduces noise entry into the vehicle cabin while maintaining ventilation performance by using a sound insulation wall and branch wall to absorb and deflect noise, and a stopper to stabilize the valve body.
Implementation Method 1
the duct body further includes a sound insulation wall portion extending from a lower edge of the opening portion toward outside of a vehicle and an upper side of the vehicle
Implementation Method 2
When there is a difference in air pressure between the inside of the vehicle cabin and the outside of the vehicle cabin, the valve body swings to temporarily open the opening portion
Data Source
AI summary
Vehicle vent duct is attached to the vehicle body, and has a duct body configured to include an opening portion for communicating the vehicle cabin and the outside of the vehicle cabin, and a retaining claw portion provided on the upper edge of the opening, and a valve body that is swingably retained by the retaining claw portion in the duct body and covers the opening, the duct body, the sound insulation wall portion extending from the lower edge of the opening to the outside and upper side of the vehicle is formed.