Induction Heating Control for Fast-Start Vapour Inhalers
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Solution Overview
Problem
Conventional electronic vapour inhalers using non-liquid flavour-release media, such as tobacco, face long start-up times due to the high thermal mass of resistance heating elements, which can lead to overheating and charring, resulting in undesirable flavour and potential generation of harmful compounds.
Innovation Solution
An induction heating arrangement with a low thermal mass induction heatable element and an alternating electromagnetic field generated by an induction coil, providing pulsed heating and cooling to rapidly heat and maintain the non-liquid flavour-release medium within a controlled temperature range, avoiding overheating and charring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a resistance heating element with high thermal mass is used to heat a non-liquid flavour-release medium, then the heating power is sufficient, but the start-up time is long and the temperature control is poor leading to overheating and charring
Solution Approach 1:
The patent replaces the conventional resistance heating element with an induction heating system. The induction heatable element is heated electromagnetically through induction heating rather than resistive heating, enabling much faster heating response. This substitution of heating mechanism fundamentally resolves the contradiction by providing both sufficient heating power and extremely rapid start-up time.
Solution Approach 2:
The patent changes the thermal mass parameter of the heating element by using an induction heatable element with lower thermal mass compared to conventional resistance heating elements. This parameter change enables the system to heat up much faster while still achieving the required heating power through efficient induction heating.
2Speed
If the heating element temperature is raised close to combustion temperature to reduce start-up time, then the heating speed improves, but charring and harmful compound generation occur
Solution Approach 1:
The induction heating system provides precise temperature control through electromagnetic heating, allowing the flavour-release medium to be heated rapidly to the optimal temperature range without exceeding it. The rapid heating capability of induction heating enables achieving combustion-like heating speed while maintaining temperature control below combustion temperature, thus preventing charring and harmful compound generation.
Solution Approach 2:
The control arrangement monitors the temperature of the induction heatable element and adjusts the induction coil energization accordingly. This feedback control ensures the temperature remains within the optimal range for vapour generation without causing charring or generating harmful compounds, even during rapid heating.
3Loss of time
If continuous heating is applied to rapidly heat the non-liquid flavour-release medium, then the start-up time is reduced, but the flavour quality deteriorates due to burning
Solution Approach 1:
The induction coil is intermittently energised in pulsed cycles rather than continuously. During each pulse, the induction heatable element is rapidly heated; during the off-period, the element cools slightly and the flavour-release medium is heated uniformly. This periodic action prevents localized overheating and charring while maintaining rapid overall heating, thus preserving flavour quality.
Solution Approach 2:
The induction heating system's inherent rapid heating capability allows the use of intermittent pulsed heating without compromising start-up time. The fast thermal response of the induction heatable element enables it to reach optimal temperature quickly during each pulse, and the low thermal mass allows rapid cooling during off-periods, preventing cumulative overheating and flavour degradation.
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
Significantly reduces the start-up time and ensures the vapour generated has optimal flavour and aroma characteristics without burning or charring, while maintaining a lower operating temperature than combustion temperatures, thus providing a safer and more efficient inhalation experience.
Implementation Method 1
an induction heating arrangement comprising an induction coil for generating an alternating electromagnetic field to heat an induction heatable element and thereby heat a non-liquid flavour-release medium
Implementation Method 2
an induction coil for generating an alternating electromagnetic field to heat an induction heatable element
Implementation Method 3
heat an induction heatable element and thereby heat a non-liquid flavour-release medium
Implementation Method 4
heat a non-liquid flavour-release medium to a temperature at which a satisfactory amount of vapour is produced
Data Source
AI summary
A method is provided for operating an electronic vapour inhaler (10) comprising an induction heating arrangement (34), the induction heating arrangement (34) comprising an induction coil (36) for generating an alternating electromagnetic field to heat an induction heatable element (28) and thereby heat a non-liquid flavour-release medium (30). The method comprises intermittently energising the induction coil (36) to generate an intermittent alternating electromagnetic field which provides pulsed heating and cooling of the induction heatable element (28).