Vaping Liquid Container with Capillary Confinement for Orientation-Independent Fill Monitoring
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Solution Overview
Problem
It is difficult for users of handheld electrically operated vaping systems to determine the remaining amount of aerosol-forming substrate in the liquid storage portion without holding the device in a specific orientation.
Innovation Solution
A liquid storage portion with a container having a transparent wall and a contiguous volume area where the aerosol-forming substrate is held near the dispensing opening by capillary forces, allowing visual monitoring of the liquid level regardless of the device's orientation, with capillary channels and optional enlarged pockets for enhanced fill level visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a window is provided in the liquid storage portion to allow visual inspection of the remaining fill level, then the user can determine the remaining amount of aerosol-forming substrate, but the electronic cigarette must be held in a specific orientation for accurate measurement
Solution Approach 1:
The invention transitions from a single-point visual inspection (2D/3D fixed orientation) to a multi-point optical sensing system that detects liquid level across multiple dimensions. The optical sensor array positioned at the bottom of the container can detect liquid presence from below, eliminating the need for side-view windows and orientation-dependent measurement. This dimensional change in sensing approach allows accurate measurement regardless of device orientation.
Solution Approach 2:
The invention replaces the mechanical/gravitational dependency of liquid settling (which required specific orientation for window-based visual inspection) with an optical detection system. The optical sensor detects liquid level through light absorption or refraction principles, substituting the mechanical settling requirement with an optical field-based measurement that works in any orientation.
2Reliability
If the liquid storage portion uses a narrow width dimension to hold liquid by capillary forces, then the liquid remains confined near the dispensing opening in any orientation, but the container size is reduced
Solution Approach 1:
The invention changes the width dimension parameter of the container to a specific narrow range that enables capillary forces to dominate over gravitational forces. By setting the width dimension below a critical threshold (e.g., less than 2mm), the capillary pressure becomes sufficient to hold the liquid column stable in any orientation. This parameter optimization allows the container to maintain reliability without requiring excessive volume, as the narrow dimension efficiently utilizes capillary action.
Solution Approach 2:
The invention employs capillary channels with porous or narrow structured walls that utilize capillary forces to confine and transport the liquid aerosol-forming substrate. The porous or narrow-walled structure creates capillary pressure that holds the liquid near the dispensing opening regardless of orientation, replacing the need for large-volume gravity-dependent storage.
3Reliability
If the container has a narrow width dimension below a predefined value, then capillary forces can hold the liquid in a well-defined volume area, but the manufacturing precision requirements increase
Solution Approach 1:
The invention identifies and optimizes the width dimension parameter to a specific range that balances capillary force effectiveness with manufacturability. By setting the width dimension to a predefined value that is narrow enough to generate sufficient capillary pressure but not excessively small, the design achieves reliable liquid confinement while maintaining reasonable manufacturing tolerances. This optimized parameter selection reduces the stringency of precision requirements compared to much narrower designs.
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 users to easily and accurately determine the remaining aerosol-forming substrate content without needing to hold the device at a specific angle, ensuring consistent and reliable access to the substrate.
Implementation Method 1
at least a section of the container has a width dimension below a desired (or alternatively predefined) value... the liquid aerosol-forming substrate is held in a contiguous volume area by capillary forces
Data Source
AI summary
A liquid storage portion for an aerosol-generating system includes a container configured to hold a liquid aerosol-forming substrate. The container has an opening for dispensing the liquid aerosol-forming substrate, and includes at least one transparent wall portion, such that the liquid level in the container can be visually monitored by the vaper. The container is further configured such that the liquid aerosol-forming substrate is held in a contiguous volume area of the container. The aerosol-forming substrate in the contiguous volume is confined near the dispensing opening of the container without regard to the orientation of the liquid storage portion.