E-Cigarette Cartridge Venting for Pressurized E-Liquid Refilling
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Solution Overview
Problem
Conventional e-cigarette personal vaporizers (PVs) face challenges in replicating the user experience of conventional cigarettes, including the need for frequent battery recharging and e-liquid refilling, which complicates their use and hinders mass-market adoption.
Innovation Solution
A PV design with a removable and rechargeable e-liquid cartridge and a portable case that refills and charges the device, featuring an air pressure valve to facilitate easy e-liquid transfer and a form factor resembling a conventional cigarette, ensuring simplicity and convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If e-liquid reservoir is filled under pressure from a parent reservoir, then refilling speed and convenience are improved, but excess air trapped in the reservoir causes filling problems and device malfunction
Solution Approach 1:
The patent employs an air-porous material (such as porous PTFE or sintered metal) as a barrier layer in the air pressure valve assembly. This material allows air molecules to pass through during pressure filling while blocking e-liquid due to surface tension effects, enabling reliable air evacuation without liquid leakage during the refilling process
Solution Approach 2:
The invention extracts the air removal function from the filling process by incorporating a dedicated air pressure valve with an air-porous barrier. This separate air evacuation pathway allows trapped air to be removed independently from the e-liquid filling operation, resolving the conflict between filling speed and filling reliability
2Ease of operation
If air-porous material is used for air escape, then air venting is improved, but e-liquid may leak through the porous material
Solution Approach 1:
The patent specifies using air-porous materials such as porous PTFE (polytetrafluoroethylene) or sintered metal with carefully controlled pore structures. These materials have pore sizes that permit air molecules to pass through while their hydrophobic surface properties and capillary pressure effects prevent e-liquid from penetrating, achieving selective permeability
Solution Approach 2:
The invention changes the physical parameters of the barrier material by selecting materials with specific pore size distributions, hydrophobicity levels, and surface energy characteristics. These parameter adjustments create a threshold effect where air can pass at normal operating pressures while e-liquid is blocked by surface tension forces
3Volume of moving object
If e-cigarette PV is made compact like conventional cigarette, then portability and user acceptance are improved, but internal components become cramped and difficult to service
Solution Approach 1:
The patent divides the e-cigarette device into modular segments including a replaceable atomizer cartridge, battery section, and mouthpiece. This segmentation allows individual components to be independently accessed, replaced, or serviced without disassembling the entire compact device, maintaining small form factor while improving maintainability
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 provides a seamless user experience by allowing easy refilling and recharging without disassembling the device, enhancing portability and usability, thereby promoting mass-market acceptance of e-cigarettes.
Implementation Method 1
The valve or device is a barrier made of an air-porous material, such as a sintered polymer or metal
Implementation Method 2
coated with or otherwise including a barrier or layer of an air-porous substance that is not porous to e-liquid, such as an oleophobic material or a hydrophobic or super-hydrophobic material
Data Source
AI summary
An e-cigarette PV that includes an air pressure valve or device so that excess air can escape from an e-liquid reservoir in the PV when that reservoir is being filled under pressure with e-liquid from a parent reservoir. The valve or device is a barrier made of an air-porous material, such as a sintered polymer or metal, coated with or otherwise including a barrier or layer of an air-porous substance that is not porous to e-liquid, such as an oleophobic material or a hydrophobic or super-hydrophobic material. The oleophobic material is one of: sintered phosphor bronze, sintered stainless steel and sintered PU plastic.