Multilayered Flap Air Extractor for Debris-Resistant Sealing
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Solution Overview
Problem
Air extractors in vehicles, particularly those in body-on-frame pickups, face issues with debris accumulation leading to warping and loss of seal due to drying mud and dirt, disrupting their ability to effectively manage pressure differences and maintain a seal.
Innovation Solution
The air extractor employs multilayered flaps with a first flap layer facing outward and a second flap layer facing inward, both made of rubber and less than 1 mm thick, pivotably secured with arrow tabs, where the first layer shields the second layer from debris and warps to maintain a reliable seal, transitioning between sealed and pressure-releasing positions based on pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer flap is used in the air extractor, then the device complexity is reduced, but the reliability of the seal deteriorates due to warping from debris accumulation
Solution Approach 1:
The flap is segmented into multiple layers (first flap layer and second flap layer) that can independently respond to debris accumulation. The first layer absorbs warping from debris while the second layer maintains the seal, allowing each layer to perform its specific function without compromising the other.
Solution Approach 2:
The first flap layer acts as an intermediary between the debris environment and the second flap layer. It shields the second layer from direct contact with debris, preventing the sealing surface from warping while still allowing the flap assembly to function as a unified pressure-regulating component.
2Reliability
If the flap is made thicker to resist warping, then the reliability of the seal is improved, but the ease of operation deteriorates due to slower response to pressure changes
Solution Approach 1:
The flap thickness requirement is segmented between two thin layers. Each layer can be made thin (less than 1 mm) for quick pressure response, yet the combined structure provides sufficient resistance to warping from debris accumulation, as the layers work together to maintain seal integrity.
Solution Approach 2:
The thickness parameter of each flap layer is optimized to be less than 1 mm, changing from a single thick flap to multiple thin flaps. This parameter change allows the flap to remain flexible and responsive to pressure changes while the multilayer configuration provides cumulative resistance to warping forces.
3Productivity
If the air extractor aperture remains open to allow pressure release, then the productivity of pressure equalization is improved, but the object-affected harmful factors worsen due to debris entering the passenger compartment
Solution Approach 1:
The flap assembly dynamically transitions between sealed and open positions based on pressure differential. When pressure inside exceeds outside pressure, the flap opens to release pressure efficiently. When pressure equalizes, the flap returns to the sealed position, preventing debris entry. This dynamic behavior resolves the contradiction between pressure release efficiency and debris protection.
Solution Approach 2:
The first flap layer serves as a protective intermediary that can contact debris while the second layer maintains the seal. This allows the aperture to remain functional for pressure release while the multilayer structure prevents debris from reaching the sealing surface and entering the passenger compartment.
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 design ensures reliable pressure regulation by maintaining a seal despite debris accumulation, preventing debris from contacting the sealing layer and allowing effective pressure release when needed, thus maintaining the air extractor's functionality and preventing pressure imbalance.
Implementation Method 1
the at least one multilayered flap is configured to transition from the sealed position to the pressure-releasing position in response to a difference between a first pressure on a first side of the housing and a second pressure on an opposite, second side of the housing
Implementation Method 2
the first flap layer is configured to shield the second flap layer from debris
Implementation Method 3
the first flap layer is configured to warp relative to the second flap layer
Data Source
AI summary
An air extractor assembly includes a housing, and at least one multilayered flap pivotably secured to the housing, the at least one multilayered flap configured to transition from a sealed position to a pressure-releasing position relative to at least one first aperture of the housing. The at least one multilayered flap can include a first flap layer directly adjacent a second flap layer. The first flap layer can shield the second flap layer from debris.