Dual-Layer Induction Heating Shielding for Field Leakage Control
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Solution Overview
Problem
Induction heating systems for vapor generating devices face electromagnetic field leakage, leading to inefficiencies and potential damage from excessive heat.
Innovation Solution
The use of a dual electromagnetic shield layer structure, comprising a ferrimagnetic non-conductive material and an electrically conductive material, along with insulating layers to minimize field leakage and heat generation, creating a compact and efficient shielding system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an induction heating system is used to heat the vaporizable substance, then heating control is improved, but electromagnetic field leakage occurs
Solution Approach 1:
An electromagnetic shield layer comprising a ferrimagnetic, non-electrically conductive material is introduced as an intermediary between the induction coil and the external environment. This shield layer absorbs and redirects electromagnetic field lines, preventing leakage while allowing the induction heating process to proceed effectively inside the heating compartment.
Solution Approach 2:
The electromagnetic shield layer uses a composite material structure that combines ferrimagnetic properties (for magnetic field interaction) with non-electrically conductive characteristics (to prevent eddy current losses). This composite approach optimizes both shielding effectiveness and energy efficiency.
2Object-generated harmful factors
If an electromagnetic shield layer is added to reduce field leakage, then electromagnetic shielding is improved, but device complexity increases
Solution Approach 1:
The electromagnetic shield layer is implemented as a thin-walled structure that can be integrated into the housing of the vapor generating device. This thin-film approach provides effective electromagnetic shielding without adding significant bulk or complexity to the device design.
Solution Approach 2:
The shield layer serves multiple functions simultaneously: it shields against electromagnetic field leakage, provides structural support for the housing, and acts as a thermal management component. This multi-functionality reduces the need for additional separate components.
3Loss of energy
If electromagnetic field leakage is reduced through shielding, then energy efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The shield layer's magnetic permeability and electrical conductivity parameters are carefully selected to optimize the balance between shielding effectiveness and manufacturing ease. By choosing materials with specific parameter ranges, the patent achieves effective shielding while maintaining compatibility with standard manufacturing processes.
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 reduces electromagnetic field leakage, enhances heating efficiency, and protects device components from excessive heat, resulting in improved performance and safety.
Implementation Method 1
Electrical energy is provided to the inductor when a user activates the device which in turn generates an alternating electromagnetic field. The susceptor couples with the electromagnetic field and generates heat
Implementation Method 2
a first electromagnetic shield layer arranged outward of the induction coil; a second electromagnetic shield layer arranged outward of the first electromagnetic shield layer; wherein the first and second electromagnetic shield layers differ in one or both of their electrical conductivity and their magnetic permeability
Implementation Method 3
an electromagnetic shield layer arranged outward of the induction coil, the electromagnetic shield layer comprising a ferrimagnetic, non-electrically conductive material
Implementation Method 4
a first insulating layer positioned between the induction coil and the electromagnetic shield layer, the first insulating layer comprising a material which is substantially non-electrically conductive and has a relative magnetic permeability substantially equal to 1
Implementation Method 5
The susceptor couples with the electromagnetic field and generates heat which is transferred, for example by conduction, to the vaporisable substance
Implementation Method 6
The susceptor couples with the electromagnetic field and generates heat
Data Source
AI summary
An induction heating assembly for a vapour generating device includes an induction coil and a heating compartment arranged to receive an induction heatable cartridge. 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. The first and second electromagnetic shield layers differ in one or both of their electrical conductivity and their magnetic permeability.