Offset-Aperture Flap Valve for Inaudible High-Frequency Flow
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Solution Overview
Problem
Conventional valves are unable to operate effectively at high frequencies above 20 kHz, which is necessary for small, portable electronic devices that require inaudible and efficient fluid flow, as they are typically designed for lower frequencies and produce audible noise.
Innovation Solution
A valve design featuring a flap between two plates with offset apertures, a spacer forming a cavity, and a lightweight flap that responds to differential pressure changes, allowing for operation at frequencies up to 20 kHz by minimizing mass per unit area and optimizing the valve gap and hole diameters for rapid movement and low pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional valve designs are used, then the valve structure is simple and easy to manufacture, but the valve cannot operate effectively at high frequencies above 20 kHz
Solution Approach 1:
The valve is segmented into distinct functional components: a first plate with apertures, a second plate with offset apertures, a spacer forming a cavity, and a lightweight flap. This segmentation allows each component to be optimized for high-frequency operation while maintaining manufacturability.
Solution Approach 2:
The invention changes critical parameters including reducing the flap mass per unit area to less than 60 grams per square meter, optimizing the cavity volume, and configuring aperture patterns to enable rapid response at frequencies above 20 kHz while controlling structural complexity.
2Speed
If the flap mass per unit area is reduced to enable high frequency operation, then the valve can operate at 20 kHz or higher, but the flap becomes more difficult to manufacture with precise mass control
Solution Approach 1:
The invention specifies a parameter range for flap mass per unit area (less than 60 grams per square meter) that balances high-frequency responsiveness with manufacturing feasibility. This parameter optimization enables rapid flap response while maintaining practical manufacturability.
3Object-affected harmful factors
If the valve is designed for high frequency operation, then inaudible operation is achieved, but the valve requires precise aperture alignment and cavity dimensions
Solution Approach 1:
The invention employs asymmetric aperture positioning where the second plate has apertures substantially offset from the first plate's apertures, and the flap has apertures substantially offset from the first plate's apertures but substantially aligned with the second plate's apertures. This asymmetric configuration optimizes fluid flow paths for high-frequency operation while providing manufacturing tolerances that reduce alignment precision requirements.
4Object-affected harmful factors
If conventional valve designs operating at lower frequencies are used, then the valve structure is robust and reliable, but the valve produces audible noise and requires larger size
Solution Approach 1:
The invention preemptively addresses reliability concerns by designing the flap and cavity to operate within specific parameter ranges that prevent excessive vibration and stress, ensuring reliable silent operation at high frequencies without requiring oversized components.
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
Enables the valve to efficiently operate at high frequencies, ensuring inaudible operation and high flow rates while maintaining a compact size, suitable for integration into portable devices.
Implementation Method 1
a flap disposed and moveable between said first plate and said second plate, wherein the mass per unit area of the flap is less than 60 grams per square meter, whereby said flap is operable to be motivated between said first plate and said second plate in response to a change in direction of the differential pressure of fluid across said valve
Data Source
Figure 1A~1B
Figure 2~3
Figure 4~5
AI summary
A valve (10,310) for controlling the flow of fluid having first and second plates (16,14) with offsetting apertures (20,18) and a spacer (12) disposed between the plates around the perimeter of the plates to form a cavity in fluid communication with the apertures is disclosed. The valve further comprises a flap (17) disposed and moveable between the first and second plates and having apertures (22) substantially offset from the apertures of one plate and substantially aligned with the apertures of the other plate. The flap is motivated between the two plates in response to a change in direction of the differential pressure of fluid across the valve.