Aerosol Generating Arrangement with Pressure Drop Liquid Control
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Solution Overview
Problem
Capillary liquid conveyers in aerosol-generating arrangements face issues with uncontrolled imbibition, leading to leakage and variations in aerosol generation due to capillary action, which affects the consistency and control of aerosol production.
Innovation Solution
A volume compensating liquid reservoir and an air duct with an ejector portion and expansion zone are used to counteract capillary imbibition, employing Bernoulli's principle to create a pressure drop that controls the liquid flow through the capillary conveyer, ensuring consistent aerosol generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a capillary liquid conveyer is used to convey liquid from reservoir to evaporation section, then liquid transport is achieved, but uncontrolled imbibition occurs causing leakage and variations in aerosol generation
Solution Approach 1:
The patent changes the pressure parameter by introducing a pressure drop zone in the air duct that creates a controlled pressure gradient. This pressure gradient opposes the capillary pressure, transforming the uncontrolled imbibition process into a controlled liquid flow process where liquid moves only when pressure differential is applied, preventing leakage while enabling consistent aerosol generation.
Solution Approach 2:
The patent introduces an intermediary element - the pressure drop zone created by the air jet - that mediates between the capillary force pulling liquid from the reservoir and the need to prevent uncontrolled imbibition. This intermediary pressure differential acts as a gatekeeper, allowing liquid flow only when needed for aerosol generation while blocking spontaneous capillary imbibition.
2Device complexity
If capillary action is used to transport liquid, then liquid conveyance is simplified, but leakage and uncontrolled imbibition occur
Solution Approach 1:
The patent converts the harmful effect of capillary action (uncontrolled imbibition and leakage) into a beneficial controlled mechanism. By introducing a pressure drop zone that creates a pressure gradient opposite to capillary pressure, the system transforms the previously harmful spontaneous liquid movement into a controlled flow that only occurs when aerosol generation is required, eliminating leakage while maintaining simple conveyer structure.
3Reliability
If volume compensating reservoir is added to counteract capillary imbibition, then leakage is prevented, but device complexity increases
Solution Approach 1:
The patent merges the volume compensating reservoir with the existing capillary liquid conveyer assembly, integrating the leakage prevention function into the liquid transport system. The reservoir is positioned to work协同 with the pressure drop zone and capillary conveyer, combining multiple functions (liquid storage, pressure compensation, and leakage prevention) into a unified structure rather than adding separate independent components.
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
This solution prevents uncontrolled leakage and enhances control over the liquid flow rate, allowing for precise regulation of aerosol generation, improving the consistency and efficiency of aerosol production.
Implementation Method 1
the air jet generating member is arranged and configured to generate an air jet in the airflow through the air duct causing a drop of the static air pressure in the vicinity of the evaporation section
Implementation Method 2
a capillary liquid conveyer for conveying aerosol-forming liquid from the liquid reservoir via a reservoir orifice to an evaporation section of the liquid conveyer outside the reservoir
Implementation Method 3
The liquid reservoir is a volume compensating liquid reservoir which is configured to counteract capillary imbibition of the capillary liquid conveyer
Implementation Method 4
There, the liquid may be vaporized by heating the evaporation section
Data Source
AI summary
The present invention relates to an aerosol-generating arrangement for generating an aerosol from an aerosol-forming liquid. The aerosol-generating arrangement comprises a liquid reservoir for storing aerosol-forming liquid and a capillary liquid conveyer for conveying aerosol-forming liquid from the liquid reservoir via a reservoir orifice to an evaporation section of the liquid conveyer outside the reservoir. The aerosol-generating arrangement further comprises an air duct for passing an airflow past the evaporation section. The liquid reservoir is a volume compensating liquid reservoir which is configured to counteract capillary imbibition of the capillary liquid conveyer. The air duct comprises an ejector portion including an air jet generating member and an expansion zone downstream the air jet generating member. The air jet generating member is arranged and configured to generate an air jet in the airflow through the air duct causing a drop of the static air pressure in the vicinity of the evaporation section. The invention further relates to an aerosol-generating article, an aerosol-generating device and an aerosol-generating system comprising such an aerosol-generating arrangement.