Porous Wick Vaporizer Layout for High-Power Aerosol Delivery
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Solution Overview
Problem
Existing vaporizer designs face challenges in maximizing vaporized source liquid delivery and vapor production efficiency due to high heat conduction, limited vapor escape rates, and undesirable by-products formation, particularly when reducing heater resistance to increase power consumption.
Innovation Solution
A vaporizer design featuring a porous electrically-insulating wick component with an embedded heating element, such as a metallic wire, configured in a serpentine shape within the wick to maximize interface area and vaporization efficiency, supported by the wick extending through chamber walls for liquid transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the heater resistance is reduced to increase power consumption and vaporization rate, then more source liquid can be vaporized during a puff, but heat conduction into the wick material increases and a larger mass of heater must be heated, reducing efficiency
Solution Approach 1:
The patent employs a porous wick material with controlled porosity (30-85%) that allows liquid transport while providing thermal insulation. The porous structure enables capillary action for liquid delivery to the heater interface while the air-filled pores reduce thermal conduction from the heater into the wick, thereby maintaining high heater power output without excessive heat loss.
Solution Approach 2:
The system uses a composite structure combining an electrically conductive heating element with an electrically insulating porous wick material. This composite arrangement allows the heater to operate at high power while the insulating wick material prevents heat conduction losses, resolving the contradiction between power output and energy efficiency.
2Quantity of substance
If a larger wick size is used to deliver more source liquid to feed higher vaporization rate, then more liquid can be supplied, but heat conduction from the heater into the wick material increases and a larger mass of heater must be heated, reducing efficiency
Solution Approach 1:
The porous wick material provides efficient liquid transport through capillary action while maintaining low thermal conductivity. The controlled porosity (30-85%) ensures adequate liquid delivery to match high vaporization rates without requiring increased wick dimensions that would amplify heat conduction losses.
3Power
If heater resistance is reduced to increase power, then vaporization intensity increases, but vapor escape rate is limited by the interface area, causing vapor pockets to form that impede liquid contact with the heater, reducing vapor production efficiency
Solution Approach 1:
The porous wick structure provides a distributed liquid delivery network that prevents vapor pocket formation. The porous channels allow continuous liquid supply to the heater interface even under intense vaporization conditions, ensuring that high power output translates efficiently into vapor production without liquid contact impairment.
4Productivity
If intense vaporization occurs at the heater-wick interface, then more vapor is produced, but vapor cannot escape quickly enough and forms pockets that impede liquid contact with the heater, causing heater temperature to rise and degrading vapor quality
Solution Approach 1:
The porous wick material facilitates rapid liquid transport and vapor escape through its interconnected pore structure. This prevents vapor pocket accumulation at the heater interface, maintaining efficient liquid contact and preventing excessive heater temperature rise that would degrade vapor quality and produce undesirable by-products.
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
Enhances vaporization efficiency by ensuring rapid vapor escape and uniform heat distribution, reducing undesirable by-products, and maintaining high power output while minimizing heat loss to the wick material.
Implementation Method 1
a wick component (37) configured to wick liquid from the source of liquid to a surface of the wick component adjacent to the embedded electrical heating element
Implementation Method 2
an electrical heating element embedded in the wick component; wherein the wick component comprises a sheet of a porous electrically-insulating material and is arranged to wick liquid from the source of liquid to a surface of the wick component adjacent to the embedded electrical heating element for vaporisation
Implementation Method 3
the wick component comprises a sheet of a porous electrically-insulating material
Data Source
Figure 1~2
Figure 3~4c
Figure 5A~5B
AI summary
A sub-assembly for an electronic vapour provision system comprises: a source of liquid for vaporisation; and a vaporizer for vaporising a portion of the liquid for inhalation by a user, the vaporizer comprising: a wick component; and an electrical heating element embedded in the wick component; wherein the wick component comprises a sheet of a porous electrically-insulating material and is arranged to wick liquid from the source of liquid to a surface of the wick component adjacent to the embedded electrical heating element for vaporisation.