High-Frequency Vibrating Mesh for Small Droplet Aerosol Delivery
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Solution Overview
Problem
Existing droplet delivery systems struggle to produce small droplet sizes efficiently, particularly when using larger mesh hole sizes, due to limitations in frequency and shearing stress on the liquid.
Innovation Solution
Implementing a high-frequency piezoelectric device to vibrate the mesh at higher frequencies, allowing for larger mesh hole sizes while maintaining small droplet sizes, and using a vibrating horn to generate droplets without continuous liquid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If higher frequency vibration is applied to the mesh, then smaller droplet sizes are achieved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical frequency control mechanisms with a piezoelectric transducer that electronically controls mesh vibration frequency. This substitution of mechanical systems with piezoelectric actuation enables precise frequency modulation without proportionally increasing mechanical device complexity, resolving the contradiction between achieving small droplet sizes through high frequency and maintaining device simplicity.
2Ease of manufacture
If larger mesh hole sizes are used, then device complexity and manufacturing difficulty are reduced, but droplet size control deteriorates
Solution Approach 1:
The patent changes the operating parameter of mesh vibration frequency to compensate for larger mesh hole sizes. By vibrating the mesh at higher frequencies, the system achieves precise droplet size control even with larger, easier-to-manufacture mesh holes. This parameter change allows the use of coarser meshes while maintaining fine droplet size control, resolving the contradiction between manufacturing ease and precision.
3Productivity
If continuous liquid flow is maintained through the mesh, then productivity is improved, but shearing stress on liquid increases
Solution Approach 1:
The patent employs periodic vibration of the mesh rather than continuous liquid flow. The piezoelectric transducer oscillates the mesh at specific frequencies, creating periodic droplet ejection. This periodic action maintains productivity through sustained droplet generation while reducing average shearing stress on the liquid compared to continuous high-velocity flow, resolving the contradiction between productivity and liquid integrity.
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
Achieves smaller droplet sizes with reduced shearing stress and easier mesh control, enabling larger mesh hole sizes and improved device longevity.
Implementation Method 1
a vibrating transducer, such as piezoelectric transducer
Implementation Method 2
reduced shearing stress on the liquid
Data Source
AI summary
A method of aerosol generation includes operating an electronic transducer at a second higher frequency than a first lower frequency with a same fluid composition and same ejector mechanism mesh with a predetermined hole size and generating smaller droplets at the second higher frequency.