Vapor Provision Device With Convoluted Airflow Liquid Trapping
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Solution Overview
Problem
Electronic cigarettes face issues with liquid leakage from the junction between the wick and the liquid reservoir, leading to potential damage of components, impaired operation, and user discomfort due to liquid exposure.
Innovation Solution
A vapor provision device with a primary airflow path featuring a convoluted section and a sump or trap to inhibit the flow of liquid upstream, preventing it from reaching sensitive components and reducing leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a capillary wick is used to transport liquid from the reservoir to the vaporizer, then liquid transport is improved, but liquid leakage increases
Solution Approach 1:
A hydrophobic barrier layer is introduced as an intermediary between the hydrophilic wick and the liquid reservoir. This barrier layer mediates the interaction by allowing the wick to absorb liquid through capillary action while preventing liquid from leaking through the wick structure, thus resolving the contradiction between liquid transport and leakage prevention
Solution Approach 2:
The wick is designed with controlled porosity and the barrier layer is made hydrophobic to create a selective permeable structure. This allows the wick to transport liquid via capillary action through its porous structure while the hydrophobic barrier prevents liquid from passing through, addressing both liquid transport needs and leakage prevention
2Object-generated harmful factors
If the airflow path is made convoluted to trap liquid, then liquid leakage is reduced, but device complexity increases
Solution Approach 1:
The convoluted airflow path is integrated into the existing device housing structure rather than being a separate component. The airflow channel is routed through the housing walls and internal structures, combining the trapping function with the structural elements already present in the device, thus reducing overall complexity while maintaining liquid trapping effectiveness
3Reliability
If a sump is added to retain liquid, then component protection is improved, but device complexity increases
Solution Approach 1:
The sump is formed by utilizing existing structural features of the device housing, such as recesses or cavities in the housing walls, rather than adding a separate sump component. This integration allows the housing structure to serve dual purposes: containing the device components and providing liquid retention, thereby improving component protection without significantly increasing device complexity
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 convoluted airflow path and sump effectively trap and retain leaked liquid, minimizing damage to internal components and user exposure, while maintaining device functionality.
Implementation Method 1
a trap located in the primary airflow path to inhibit the flow of liquid along the primary airflow path in an upstream direction from the trap by retaining liquid
Implementation Method 2
liquid may form from vapor that condenses while still within the e-cigarette
Implementation Method 3
a vapor generation chamber containing a vaporizer, for example, a heating element, which is arranged to vaporize a portion of the precursor
Implementation Method 4
a vaporizer, for example, a heating element, which is arranged to vaporize a portion of the precursor
Implementation Method 5
many liquid-based e-cigarettes have a capillary wick for transporting liquid (vapor precursor) from the reservoir to the vaporizer
Data Source
AI summary
A vapor provision device includes a primary airflow path, internal to the vapor provision device, from an air inlet to an air outlet, wherein air is drawn from the air inlet in a downstream direction through the primary airflow path to the air outlet by user inhalation. The device further includes a vaporizer for providing vapor into the primary airflow path, wherein the vaporizer is located within or adjacent to the primary airflow path, and a trap located in the primary airflow path to inhibit the flow of liquid along the primary airflow path in an upstream direction from the trap by retaining liquid.