Movable Sealing Element for Aerosol Cartridge Leakage Control
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Solution Overview
Problem
Existing aerosol-generating device cartridges face issues with leakage of aerosol-forming substrate, require separate disposable sealing means, and lack user-friendly features for verifying freshness and handling.
Innovation Solution
A cartridge design featuring a tubular reservoir with a movable sealing element that automatically transitions from a sealed to an open position when attached to the device, eliminating the need for separate sealing means and allowing for visual freshness verification, while being of low complexity and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate disposable sealing means (removable sealing cap or disposable sealing foil) are used to prevent leakage, then leakage prevention is improved, but device complexity and manufacturing costs increase
Solution Approach 1:
The sealing function is merged with the cartridge body by integrating a movable sealing element directly into the cartridge structure. This eliminates the need for separate disposable sealing caps or foils, reducing device complexity while maintaining leakage prevention. The sealing element is axially movable within the cartridge and can be positioned to fluidly isolate the reservoir from the hollow inner channel when needed.
Solution Approach 2:
The sealing element is designed to be axially movable rather than fixed, allowing it to transition between sealed and open positions. This dynamic capability enables the cartridge to maintain reliability during storage and transport while allowing easy access during use, eliminating the need for separate disposable sealing components.
2Reliability
If separate disposable sealing means are used, then leakage prevention is improved, but manufacturing costs increase
Solution Approach 1:
The sealing function is integrated into the cartridge body as a movable sealing element, eliminating the need for separate disposable sealing components. This reduction in part count simplifies the manufacturing process and reduces assembly steps, thereby lowering manufacturing costs while maintaining effective leakage prevention.
Solution Approach 2:
The movable sealing element is designed to be manually operable by the user without requiring additional sealing components. The user can simply move the sealing element axially to open or close the cartridge, eliminating the need for separate disposable sealing means and reducing manufacturing complexity and cost.
3Device complexity
If a movable sealing element is integrated into the cartridge, then device complexity is reduced, but leakage prevention capability may worsen
Solution Approach 1:
The sealing element is designed to be axially movable within the cartridge structure, allowing it to transition between a sealed position (fluidly isolating the reservoir from the hollow inner channel) and an open position. This dynamic design maintains effective leakage prevention while integrating the sealing function directly into the cartridge, reducing overall device complexity.
Solution Approach 2:
The movable sealing element is designed as a simple, replaceable component that can be easily manufactured and integrated into the cartridge. Its straightforward design ensures reliable sealing performance without adding complexity, and it can be replaced if needed without requiring complex mechanisms.
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 cartridge effectively reduces leakage, simplifies manufacturing and user experience, and provides a comfortable handling option by integrating a fluid permeable wall and movable sealing mechanism, enhancing user interaction and operational efficiency.
Implementation Method 1
The movable sealing element may be axially movable along the hollow inner channel from a first position to fluidly isolate the reservoir from the hollow inner channel to a second position to fluidly connect the reservoir with the hollow inner channel
Data Source
AI summary
A cartridge for an aerosol-generating device is provided, including a tubular reservoir to hold a liquid aerosol-forming substrate; an inner sidewall of the tubular reservoir coaxially circumscribing a hollow inner channel; and a tubular movable sealing element within the channel and being axially movable therein from a first position to fluidly isolate the reservoir to a second position to fluidly connect the reservoir with the channel, a cross-section of an inner hollow channel of the element varying along an axial direction thereof, a diameter of the inner hollow channel of the element being reduced at a position along an axial direction thereof to between 0.4 and 1.0 mm, and inner walls of the element being convexly shaped such that a center portion of the inner hollow channel of the element has a reduced diameter with respect to proximal and distal end portions of the inner hollow channel.