Offset-Aperture Flap Valve for High-Frequency Wear Reduction
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Solution Overview
Problem
High-frequency valves used in portable electronic devices face issues with robustness, wear, and fatigue due to the need for high-frequency operation, leading to premature failure, especially with thin flap designs and sharp aperture edges causing increased stress and flow restrictions.
Innovation Solution
A valve design featuring offset apertures and a movable flap with controlled force distribution using features such as coatings and support layers to reduce stress and wear, and smooth out aperture edges, enhancing the valve's longevity and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a thin valve flap is used, then valve response time is improved, but robustness and wear resistance deteriorate
Solution Approach 1:
The valve flap is made from a composite material comprising a flexible polymer matrix reinforced with a three-dimensional random network of thermoplastic polyurethane elastomer filaments. This composite structure provides both the flexibility needed for fast response and the reinforced strength to resist wear and fatigue, resolving the contradiction between thin-flap speed and robustness.
2Quantity of substance
If chemical etching is used to fabricate small apertures, then flow restriction is reduced, but valve plate thickness is reduced leading to stiffness and vibration problems
Solution Approach 1:
The fabrication method is changed from chemical etching to laser drilling, which allows creation of small apertures (0.5-2mm diameter) in thicker valve plates without the material removal and edge roughness problems of etching. This parameter change in manufacturing process enables maintaining plate stiffness while achieving small aperture sizes for reduced flow restriction.
3Manufacturing precision
If chemical etching is used to fabricate apertures, then aperture size can be controlled, but sharp corners and rough edges cause increased wear on the valve flap
Solution Approach 1:
The chemical etching process is replaced with laser drilling technology. This substitution eliminates the chemical reactions that create sharp corners and rough edges, instead producing smooth-walled apertures with minimal burrs. The laser energy directly ablates material cleanly, removing the harmful sharp edges that cause flap wear while maintaining precise aperture size control.
4Volume of moving object
If valve operation frequency is increased to 20 kHz and higher, then pump size is reduced, but valve fatigue and failure increase
Solution Approach 1:
The valve flap uses a composite material with thermoplastic polyurethane elastomer filaments embedded in a flexible polymer matrix, providing enhanced fatigue resistance for high-frequency operation. Additionally, the valve plate uses a foam core structure that dampens vibrations and reduces stress concentrations, enabling reliable operation at 20 kHz and higher frequencies while maintaining compact pump size.
Solution Approach 2:
The valve design incorporates asymmetric aperture positioning where the aperture in the valve plate is offset from the center of the valve flap. This asymmetric arrangement creates a larger effective sealing area and distributes contact stresses more favorably during high-frequency operation, reducing fatigue and extending valve life at 20 kHz operating frequencies.
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 effectively reduces wear and fatigue, prolongs the lifespan of the valve flap, and minimizes flow restrictions, enabling the valve to operate reliably at high frequencies for extended periods without premature failure.
Implementation Method 1
the flap is operable to be motivated between the first and second plates in response to a change in direction of the differential pressure of the fluid across the valve
Implementation Method 2
at least one of said first plate or said second plate (and/or, optionally, said flap itself) comprises one or more features arranged to control the distribution of one or more forces asserted on said flap when said flap impacts or is in contact with said first plate or second plate
Data Source
AI summary
A valve includes a first plate, a second plate, a spacer disposed between the first plate and the second plate, and a flap movably disposed between the first plate and the second plate. The first plate includes a plurality of first apertures extending through said first plate and the second plate includes a plurality of second apertures extending through said second plate. The second apertures are substantially offset from the first apertures. The spacer forms a cavity between the first plate and the second plate and is in fluid communication with the first apertures and the second apertures. The flap has apertures substantially offset from the first apertures and substantially aligned with the second apertures, and the flap is operable to be motivated between said first and second plates in response to a change in direction of the differential pressure of the fluid across the valve.