Induction Heating Assembly Susceptor Segmentation for Aerosol Devices
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Solution Overview
Problem
Current aerosol generating devices face challenges in rapidly and uniformly heating aerosol generating substrates to the required temperature range of 150° C to 300° C without burning, while accurately controlling the heating temperature to produce a suitable aerosol for inhalation.
Innovation Solution
An induction heating assembly comprising an induction coil, an inductively heatable susceptor with a first part positioned within the electromagnetic field and a second part outside, and a temperature sensor in contact with the second part to measure the temperature accurately, ensuring efficient and uniform heating of the aerosol generating substrate without inducing heat in the sensor, and a power source to operate the induction coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is placed in contact with the susceptor to measure temperature, then temperature measurement is achieved, but the sensor is inductively heated by the electromagnetic field causing inaccurate measurements
Solution Approach 1:
The susceptor is divided into two distinct parts: a first part that is inductively heated by the electromagnetic field to heat the aerosol generating substrate, and a second part that extends outside the electromagnetic field for temperature sensing. This segmentation allows the temperature sensor to contact the susceptor for accurate temperature measurement without being exposed to the electromagnetic field that would cause inductive heating and measurement errors.
Solution Approach 2:
The second part of the susceptor acts as an intermediary element, extending from the heated zone outside the electromagnetic field to provide a temperature sensing interface. This intermediary allows thermal contact for accurate temperature measurement while being thermally isolated from the electromagnetic field's direct heating effect, enabling the sensor to measure true substrate temperature without being inductively heated itself.
2Speed
If the susceptor is positioned within the electromagnetic field for inductive heating, then rapid heating of the substrate is achieved, but the temperature becomes difficult to measure accurately
Solution Approach 1:
The susceptor is segmented into a first part positioned within the electromagnetic field for rapid inductive heating of the substrate, and a second part extending outside the electromagnetic field for temperature measurement. This spatial segmentation enables simultaneous rapid heating in the field zone and accurate temperature sensing in the non-field zone, resolving the contradiction between heating speed and measurement accuracy.
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 configuration allows for rapid, uniform, and energy-efficient heating of the aerosol generating substrate, maintaining the desired temperature to generate a vapour that cools and condenses into an aerosol, ensuring user comfort and efficient energy use.
Implementation Method 1
an induction coil for generating an electromagnetic field; an inductively heatable susceptor having a first part positioned with respect to the induction coil so that it is inductively heated by the electromagnetic field
Implementation Method 2
Heat is conducted from the first part of the inductively heatable susceptor to the second part of the inductively heatable susceptor
Implementation Method 3
a temperature sensor in contact with the second part of the inductively heatable susceptor
Implementation Method 4
generate a heated vapour which cools and condenses to form an aerosol for inhalation by a user of the device
Data Source
AI summary
An induction heating assembly for an aerosol generating device includes an induction coil for generating an electromagnetic field, and an inductively heatable susceptor having a first part and a second part which include the same susceptor material. The first part is positioned with respect to the induction coil so that it is inductively heated by the electromagnetic field and the second part is positioned with respect to the induction coil so that it is not inductively heated by the electromagnetic field. The induction heating assembly further includes a temperature sensor in contact with the second part of the inductively heatable susceptor.