Electrowetting E-Liquid Valve for Aerosol Leakage Control
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Solution Overview
Problem
Existing aerosol generation devices, such as E-cigarettes, suffer from liquid oversaturation at the heating element, leading to leakage and unpleasant smoking experiences due to unvaporized liquid, which can contaminate surfaces and affect user satisfaction.
Innovation Solution
A device with a liquid conduit and a valve featuring an oleophobic surface and electrodes to control the flow of oleaginous or fatty aerosol liquid to the vaporization area, adjusting the liquid supply based on heater temperature and user input, preventing oversaturation and leakage without moving parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an open conduit is used to convey liquid from the reservoir to the heating element, then liquid flow is simple and unobstructed, but liquid oversaturation occurs at the heating element leading to leakage
Solution Approach 1:
The patent replaces the traditional mechanical valve system with an electro-wetting-based control mechanism. The oleophobic surface's wetting properties are dynamically controlled by applying voltage, eliminating the need for moving mechanical parts while achieving reliable liquid flow control to prevent oversaturation and leakage at the heating element.
Solution Approach 2:
The patent changes the surface energy parameters of the oleophobic surface by applying voltage through the first electrode. This dynamic parameter change allows the surface to transition between oleophobic (repelling liquid) and oleophilic (attracting liquid) states, enabling precise control of liquid flow to the heating element and preventing leakage.
2Device complexity
If no valve control is used, then device complexity is reduced, but liquid leakage and contamination occur
Solution Approach 1:
The patent replaces complex mechanical valve structures with a simple oleophobic surface that can be electrically controlled. This substitution maintains device simplicity while effectively preventing liquid contamination through electro-wetting control, as the surface property changes are achieved through voltage application rather than mechanical movement.
Solution Approach 2:
The oleophobic surface acts as an intermediary between the liquid conduit and the vaporization area. By controlling the surface's wetting properties through voltage, it mediates liquid flow without requiring complex valve mechanisms, thus preventing contamination while maintaining structural simplicity.
3Adaptability or versatility
If the heater temperature varies dynamically, then adaptability to user needs is improved, but liquid oversaturation or insufficiency occurs
Solution Approach 1:
The patent implements a feedback control system where the controller monitors heater temperature and dynamically adjusts the voltage applied to the oleophobic surface accordingly. This feedback mechanism ensures that liquid flow is precisely matched to the heater's instantaneous temperature and power state, maintaining complete vaporization reliability while adapting to varying user needs.
Solution Approach 2:
The patent introduces dynamic control of the oleophobic surface's wetting properties that mirrors the dynamic temperature variations of the heater. The surface's liquid-attracting or liquid-repelling behavior changes in real-time based on heater conditions, ensuring optimal liquid supply for complete vaporization across all operating temperatures.
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 manages liquid flow to ensure complete vaporization and prevents leakage, enhancing user experience by maintaining consistent aerosol production and reducing device contamination.
Implementation Method 1
the valve comprising an oleophobic surface, and a first electrode configured to supply a voltage to the oleophobic surface, wherein the oleophobic surface is configured such that it becomes less oleophobic with an increase in the voltage
Implementation Method 2
a heater configured to heat an oleaginous, oily or fatty aerosol liquid to generate an aerosol
Implementation Method 3
A typical way to convey liquid from the reservoir to the heating element is performed by an open conduit leading to wick or capillary element associated to the heating element
Data Source
AI summary
A device includes a liquid conduit in fluid communication or configured to be brought into fluid communication with a vaporization area, the vaporization area being in thermal communication or configured to be brought into thermal communication with a heater configured to heat an oleaginous, oily or fatty aerosol liquid to generate an aerosol, the conduit being configured to receive the oleaginous, oily or fatty aerosol liquid and to direct the oleaginous, oily or fatty aerosol generating liquid to the vaporization area; and a valve arranged in the liquid conduit configured to selectively control the flow of the oleaginous, oily or fatty aerosol generating liquid to the vaporization area, the valve including an oleophobic surface and a first electrode configured to supply a voltage to the oleophobic surface, wherein the oleophobic surface is configured such that it becomes less oleophobic with an increase in the voltage.