Aerosol Generating Device Indirect Wick Heating
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Solution Overview
Problem
Existing aerosol generating devices, such as e-cigarettes, often lack efficient methods to vaporize liquids without burning tobacco, leading to inconsistent aerosol delivery and potential decomposition products, and do not effectively control the heating of wicks, which can result in user experience issues.
Innovation Solution
An aerosol generating device with a heating element that heats inlet air to pass over a wick, volatilizing a liquid to produce aerosol, and includes a shield element to ensure convection heating and prevent radiation exposure, allowing for controlled temperature settings and customizable flavor modifications through a removable element in the flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heating element is used to heat the wick directly, then aerosol generation is achieved, but temperature control becomes difficult and decomposition products increase
Solution Approach 1:
The patent introduces air as an intermediary medium between the heating element and the wick. The heating element heats the air, and the heated air then convectively heats the wick indirectly. This intermediary approach prevents direct contact between the heating element and wick, enabling better temperature control and reducing decomposition products.
Solution Approach 2:
The patent replaces direct thermal conduction heating with convective heating through heated air. This substitution of heating mechanism allows for more uniform temperature distribution and better control, preventing localized overheating that causes decomposition.
2Productivity
If the heating element is positioned close to the wick for efficient heating, then aerosol generation is improved, but radiation exposure of the wick increases causing inconsistent vaporization
Solution Approach 1:
The heated air acts as an intermediary that transfers thermal energy from the heating element to the wick through convection rather than radiation. This eliminates the issue of radiation exposure causing inconsistent vaporization, while maintaining heating efficiency through the convective process.
3Power
If the wick is exposed to radiation from the heating element, then heating efficiency increases, but temperature uniformity decreases leading to poor aerosol delivery
Solution Approach 1:
The patent substitutes radiative heating with convective heating through heated air. Convection provides more uniform heat distribution across the wick surface compared to radiation, which tends to create hot spots. This maintains heating efficiency while improving temperature uniformity for consistent aerosol delivery.
4Temperature
If a shield element is added to block radiation from the wick, then temperature control improves, but device complexity increases
Solution Approach 1:
Instead of adding a physical shield element, the patent uses heated air as a mediator to block radiative heat transfer to the wick. The stream of heated air physically intervenes between the heating element and wick, blocking radiation while transferring heat through convection. This achieves temperature control without increasing structural 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
This solution ensures uniform aerosol delivery, reduces decomposition products, and provides user control over aerosol properties, improving the overall user experience by maintaining consistent wick temperature and allowing for customizable flavors and nicotine levels.
Implementation Method 1
a heating element, upstream of the wick, the heating element being for heating inlet air from the air inlet to generate, in use, a flow of heated air in the flow path
Implementation Method 2
said flow of heated air generated in use passes over the wick to volatilize said liquid to generate, in use, a flow of aerosol in the flow path
Data Source
AI summary
An aerosol generating device defines a flow path from an air inlet to an inhalable medium outlet. The device includes a container for containing a liquid; a wick for drawing liquid from the container into the flow path, and a heating element, upstream of the wick, for heating inlet air from the air inlet to generate a flow of heated air in the flow path in use. The device is arranged such that, in use, the flow of heated air generated in use passes over the wick to volatilize the liquid to generate, in use, a flow of aerosol in the flow path. The device includes a receiving portion in the flow path, downstream of the wick, for receiving an element for modifying a property of the flow of aerosol. A device including a shield element to shield the wick from a heating element is also disclosed.