Vibrating Aperture Plate Nebulizer With Bubble-Reducing Seals
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Solution Overview
Problem
Vibrating aperture plate nebulizers tend to ingest air bubbles through the center of the aperture plate, which can form larger bubbles that stagnate and disrupt nebulization, affecting efficiency and consistency.
Innovation Solution
The nebulizer design includes an upstream resilient seal and a downstream resilient seal, with a power conductor system using spring contacts and a gasket with a funnel-shaped throat to minimize bubble formation and enhance liquid flow consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a vibrating aperture plate is used for nebulization, then aerosol generation is effective, but air bubbles are ingested through the center of the aperture plate and form larger bubbles that disrupt nebulization
Solution Approach 1:
A hydrophilic coating is applied to the aperture plate surface to act as an intermediary layer that preferentially attracts and guides liquid while repelling air bubbles. This coating modifies the surface properties to prevent bubble adhesion and facilitate bubble release, thereby maintaining consistent nebulization performance
Solution Approach 2:
The surface energy parameters of the aperture plate are changed by applying a hydrophilic coating, which alters the interaction between the plate surface and the liquid-air interface. This parameter change ensures that liquid wets the surface while air bubbles are repelled, preventing bubble accumulation and disruption
2Reliability
If physical features are added to the interior reservoir surface to prevent bubble formation, then bubble size is controlled, but device complexity increases
Solution Approach 1:
The hydrophilic coating on the aperture plate provides self-service bubble prevention by inherently repelling air bubbles through its surface properties. The coating enables the aperture plate to actively prevent bubble adhesion without requiring additional mechanical structures or features in the reservoir
Solution Approach 2:
The bubble prevention function is extracted from the reservoir structure and transferred to the aperture plate surface coating. This eliminates the need for complex reservoir features by concentrating the bubble prevention mechanism on the aperture plate itself
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 design effectively reduces bubble formation and enhances the efficiency and consistency of aerosol generation by preventing larger bubbles from forming and improving liquid conversion into aerosol.
Implementation Method 1
an annular piezoelectric vibration generator
Implementation Method 2
upstream resilient seal
Data Source
AI summary
A nebulizer has an aerosol generator, a reservoir, and an aerosol outlet. A piezoelectric vibration generator is on a downstream side of a support washer, and power to the piezo is provided by a spring contact assembly. The assembly has upstanding electrical terminals for contact with electrical supply conductors. There are spring terminals extending around a rim of the spring contact assembly to engage an exposed underside of the washer, and a resilient ridge extending in the upstream direction to engage the underside of the piezo, which itself is on the downstream side of the washer.