Induction Heating Assembly Susceptor Shielding for Aerosol Devices
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Solution Overview
Problem
Existing aerosol generating devices face challenges in rapidly and uniformly heating aerosol generating substrates to generate a vapour aerosol with suitable characteristics, while accurately controlling the heating temperature.
Innovation Solution
The induction heating assembly includes a heating chamber, an induction coil externally positioned to generate an electromagnetic field, an inductively heatable susceptor at the periphery of the heating chamber, and a temperature sensor shielded from the electromagnetic field by a geometric feature, allowing for accurate temperature measurement and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is placed in thermal contact with the susceptor for accurate temperature measurement, then temperature control accuracy is improved, but the temperature sensor is exposed to the electromagnetic field causing measurement errors
Solution Approach 1:
A shield structure made of electrically conductive material is introduced as an intermediary between the electromagnetic field and the temperature sensor. This shield acts as a mediator that blocks or redirects the electromagnetic field while allowing thermal contact between the sensor and susceptor, thus protecting the sensor from field interference while maintaining temperature measurement capability
Solution Approach 2:
The shield structure is positioned in advance to prevent electromagnetic field interference from reaching the temperature sensor. By placing the shield between the induction coil's electromagnetic field and the temperature sensor, the harmful effect is counteracted before it can affect the sensor readings
2Speed
If an induction coil is used to rapidly heat the aerosol generating substrate, then heating speed is improved, but uniform heating and temperature control become difficult
Solution Approach 1:
A temperature sensor is placed in thermal contact with the susceptor to provide real-time temperature feedback. This feedback signal is used to control the power supplied to the induction coil, enabling closed-loop temperature control that maintains the desired temperature while achieving rapid heating through induction
3Measurement precision
If the temperature sensor is positioned close to the susceptor for accurate measurement, then measurement responsiveness is improved, but the sensor is more strongly affected by the electromagnetic field
Solution Approach 1:
The shield structure serves as a physical barrier positioned between the electromagnetic field source and the temperature sensor. It allows thermal energy to pass through to the sensor while blocking or redirecting electromagnetic radiation, enabling the sensor to remain close to the susceptor for responsive measurement without direct electromagnetic exposure
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 enables rapid and uniform heating of the aerosol generating substrate, ensuring efficient energy transfer and accurate temperature control, which is crucial for generating a vapour aerosol with desirable characteristics for inhalation.
Implementation Method 1
an induction coil positioned externally of the heating chamber for generating an electromagnetic field; an inductively heatable susceptor positioned inside the heating chamber at a periphery thereof externally of heating the aerosol generating substrate, the inductively heatable susceptor being arranged with respect to the induction coil to be inductively heated by the generated electromagnetic field
Implementation Method 2
The susceptor couples with the electromagnetic field and generates heat which is transferred, for example by one or more of conduction, radiation and convection to the aerosol generating substrate
Implementation Method 3
The susceptor couples with the electromagnetic field and generates heat which is transferred, for example by one or more of conduction, radiation and convection to the aerosol generating substrate
Implementation Method 4
The susceptor couples with the electromagnetic field and generates heat which is transferred, for example by one or more of conduction, radiation and convection to the aerosol generating substrate
Implementation Method 5
the inductively heatable susceptor has a geometric feature arranged to shield the temperature sensor from the generated electromagnetic field
Data Source
AI summary
An induction heating assembly for an aerosol generating device includes a heating chamber for receiving at least part of an aerosol generating substrate, an induction coil positioned externally of the heating chamber for generating an electromagnetic field, an inductively heatable susceptor positioned inside the heating chamber at a periphery thereof externally of the aerosol generating substrate, and a temperature sensor in thermal contact with the inductively heatable susceptor. The inductively heatable susceptor is arranged with respect to the induction coil to be inductively heated by the generated electromagnetic field and has a geometric feature arranged to shield the temperature sensor from the generated electromagnetic field.