Induction Heating Assembly Shielding for Aerosol Devices
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Solution Overview
Problem
Induction heating systems for aerosol generating devices suffer from electromagnetic field leakage and housing overheating, leading to user discomfort.
Innovation Solution
A multi-layered structure comprising electromagnetic shield layers and thermally insulating layers is employed around the induction coil, with specific materials and spacing to minimize electromagnetic leakage and improve thermal insulation, ensuring the device housing remains cool to the touch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an induction heating system is used to heat the substrate, then aerosol generation efficiency is improved, but electromagnetic field leakage occurs and housing overheating happens
Solution Approach 1:
The shielding structure is divided into multiple segments: an inner electromagnetic shield (ferrite layer) and an outer electromagnetic shield (conductive mesh), with thermal insulation layers positioned between them and the housing. This segmented approach allows each layer to perform its specific function optimally while working together to solve both electromagnetic leakage and thermal management issues.
Solution Approach 2:
Thermal insulation layers (such as ceramic fibres or aerogel) are introduced as intermediary elements between the heating compartment and the housing. These intermediaries block heat transfer pathways, preventing thermal energy from reaching the housing while allowing the heating system to operate at high temperatures for efficient aerosol generation.
2Object-affected harmful factors
If electromagnetic shield layers are added to reduce field leakage, then shielding effectiveness is improved, but device complexity increases
Solution Approach 1:
The shielding structure is designed to serve multiple functions simultaneously: the inner ferrite shield provides electromagnetic shielding and magnetic flux guidance, the thermal insulation layers provide thermal management, and the outer conductive mesh provides additional electromagnetic shielding and structural support. This multi-functionality reduces the need for separate components, thereby managing complexity while achieving comprehensive protection.
Solution Approach 2:
The shields are positioned at specific distances from the heating compartment and from each other, with the inner shield placed close to maximize electromagnetic shielding effectiveness and the outer shield positioned to provide additional protection while maintaining a compact overall structure. This optimized parameter selection achieves effective shielding with minimal structural complexity.
3Temperature
If thermal insulation layers are added to prevent housing overheating, then thermal insulation is improved, but device volume increases
Solution Approach 1:
The thermal insulation system uses composite material structures, such as ceramic fibres or aerogel, which provide exceptional thermal insulation performance per unit thickness. These advanced materials have extremely low thermal conductivity, allowing effective heat blocking with minimal layer thickness, thereby preventing housing overheating while maintaining a compact device volume.
Solution Approach 2:
Thermal insulation layers are applied selectively in regions where heat transfer to the housing is most problematic, such as around the heating compartment and near the housing interface. This localized approach provides effective thermal management where needed while minimizing the overall volume increase, rather than insulating the entire device uniformly.
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
The solution effectively reduces electromagnetic field leakage and prevents the device housing from overheating, providing a comfortable handling experience for users while maintaining efficient aerosol generation.
Implementation Method 1
Electrical energy is provided to the inductor when a user activates the device which in turn generates an alternating electromagnetic field
Implementation Method 2
A first electromagnetic shield layer is arranged outward of the induction coil and a second electromagnetic shield layer is arranged outward of the first electromagnetic shield layer
Implementation Method 3
A first thermally insulating layer is arranged outward of the first electromagnetic shield layer... a third thermally insulating layer arranged outward of the first thermally insulating layer
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
An induction heating assembly (10) for an aerosol generating device (100). The induction heating assembly (10) comprises an induction coil (12), a heating compartment (14) arranged to receive an aerosol generating substrate, and a structure (16) arranged around the induction coil (12). The structure (16) comprises a first electromagnetic shield layer (18), a second electromagnetic shield layer (20) arranged outward of the first electromagnetic shield layer (18), and a first thermally insulating layer (22) disposed between the first and second electromagnetic shield layers (18, 20). The first thermally insulating layer (22) has an inner surface (26) that contacts an outer surface (28) of the first electromagnetic shield layer (18) and an outer surface (30) that contacts an inner surface (32) of the second electromagnetic shield layer (20).