Flux Concentrator Bond Layer for Inductive Heating
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Solution Overview
Problem
Aerosol-generating devices that inductively heat aerosol-forming substrates face issues with magnetic shielding effectiveness, as existing flux concentrators can break and lose integrity upon excessive force impacts, leading to reduced magnetic field concentration and increased undesired heating of adjacent materials.
Innovation Solution
The device incorporates a flux concentrator with a bond layer, such as a parylene coating, to keep fragments bonded and maintain magnetic field focus, enhancing magnetic shielding and heat efficiency while withstanding impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flux concentrator is used to concentrate magnetic field, then magnetic shielding effectiveness is improved, but the flux concentrator can break and lose integrity upon excessive force impacts
Solution Approach 1:
The flux concentrator is constructed as a composite structure combining a magnetic core (ferromagnetic material) with a protective shell (impact-resistant material). This composite design allows the magnetic core to maintain magnetic shielding effectiveness while the protective shell absorbs impact forces, preventing breakage and maintaining structural integrity under excessive force conditions.
2Reliability
If the flux concentrator is made of brittle material for magnetic field concentration, then magnetic field focus is improved, but the flux concentrator breaks easily under excessive force impacts
Solution Approach 1:
The flux concentrator is divided into functionally distinct segments: a magnetic core segment responsible for magnetic field concentration and a protective shell segment responsible for impact absorption. This segmentation allows each part to be optimized for its specific function - the magnetic core uses brittle but magnetically suitable material while the protective shell uses tough, impact-resistant material, collectively solving the contradiction between magnetic field focus and impact resistance.
3Device complexity
If flux concentrator fragments are allowed to separate after breakage, then device complexity is reduced, but magnetic shielding effectiveness is lost
Solution Approach 1:
The protective shell is designed to remain intact and enclose the magnetic core even after the magnetic core breaks into fragments. This merging of the protective function into a single continuous shell structure ensures that regardless of core fragmentation, the magnetic shielding effectiveness is maintained, while avoiding the need for complex reassembly mechanisms would simplify device complexity.
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 improves the robustness of magnetic shielding, reduces undesired heating, and increases heat generation efficiency within the aerosol-generating device by maintaining the integrity of the flux concentrator even after potential breakage, ensuring consistent performance.
Implementation Method 1
The field is used to induce at least one of heat generating eddy currents or hysteresis losses in a susceptor
Implementation Method 2
The field is used to induce at least one of heat generating eddy currents or hysteresis losses in a susceptor
Implementation Method 3
a flux concentrator arranged around the induction coil and configured to distort the alternating magnetic field of the induction source during use of the device towards the cavity
Implementation Method 4
a bond layer firmly coupled to a least a portion of the flux concentrator, in particular for keeping possible fragments of the flux concentrator bonded in case of a breakage of the flux concentrator into fragments
Data Source
AI summary
An aerosol-generating device for generating an aerosol by inductive heating of an aerosol-forming substrate is provided, the device including a device housing including a cavity configured to receive the aerosol-forming substrate; an induction source including an induction coil configured to generate an alternating magnetic field within the cavity, the induction coil being arranged around at least a portion of the cavity; a flux concentrator arranged around the induction coil and configured to distort the alternating magnetic field of the induction source towards the cavity; and a bond layer firmly coupled to a least a portion of the flux concentrator, the bond layer including or consisting of a poly(p-xylylene) polymer. There is also provided an aerosol-generating system including an aerosol-generating device including and an aerosol-generating article for the device, the article including an aerosol-forming substrate to be heated.