Inductor Coil Ferrite Shielding for Cooler Aerosol Heating
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Solution Overview
Problem
Existing aerosol provision devices face challenges in effectively shielding electrical components from electromagnetic radiation generated by inductor coils while maintaining a comfortable and safe surface temperature, often requiring large quantities of ferrite material which can be heavy, bulky, and expensive.
Innovation Solution
The use of a magnetic shield member made from ferrite material, arranged in contact with the inductor coil and extending partially around it, reduces the amount of ferrite needed by up to 30% and creates an effective thermal barrier, trapping heat and reducing the surface temperature of the device, while also acting as an insulator to make the device more comfortable and safe to use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If large quantities of ferrite material are used to shield electrical components from electromagnetic radiation, then shielding effectiveness is improved, but device weight and bulk increase
Solution Approach 1:
The patent applies ferrite material locally rather than uniformly throughout the device. The ferrite is positioned specifically in areas where electromagnetic shielding is most needed, such as around inductor coils and near sensitive electrical components, while leaving other areas without ferrite. This localized approach maintains shielding effectiveness where required while significantly reducing overall ferrite quantity and device weight.
Solution Approach 2:
The patent introduces air gaps as intermediary spaces between ferrite components and other device elements. These air gaps serve as thermal insulators that reduce heat transfer from heated components to the device exterior, allowing reduced ferrite quantities while maintaining both shielding and thermal management functions.
2Object-affected harmful factors
If large quantities of ferrite material are used to shield electrical components from electromagnetic radiation, then shielding effectiveness is improved, but device cost increases
Solution Approach 1:
The patent reduces ferrite material consumption by applying it only where electromagnetic shielding is critically needed, rather than using uniform coverage throughout the device. This localized application strategy directly reduces material costs while maintaining adequate shielding performance for safe device operation.
3Object-affected harmful factors
If ferrite material is used to shield electromagnetic radiation, then shielding effectiveness is improved, but surface temperature increases making the device less comfortable to use
Solution Approach 1:
The patent introduces air gaps as thermal insulating intermediaries between the ferrite-shielded heated components and the device exterior surfaces. These air gaps impede heat transfer pathways, allowing the ferrite to perform its electromagnetic shielding function while preventing excessive heat from reaching the device outer shell, thus maintaining comfortable surface temperatures for user contact.
4Temperature
If ferrite material is used as thermal insulator, then surface temperature is reduced improving comfort, but the amount of material required increases
Solution Approach 1:
The patent applies ferrite material selectively in locations where both electromagnetic shielding and thermal insulation are simultaneously beneficial. By positioning ferrite near heat-generating components like inductor coils, the same material serves dual purposes: shielding against electromagnetic radiation and insulating to reduce surface temperature. This multi-functional placement reduces the total ferrite quantity needed compared to using separate dedicated insulation materials.
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 solution effectively reduces the surface temperature of the outer cover by up to 3°C, maintaining it below 48°C for multiple heating sessions, and reduces the mass and cost of ferrite material required, enhancing the device's usability and efficiency.
Implementation Method 1
a first inductor coil extending around a first region of the susceptor and a second inductor coil extending around a second region of the susceptor
Implementation Method 2
a radially extending magnetic shield member arranged between the first inductor coil and the second inductor coil
Implementation Method 3
creates an effective thermal barrier, trapping heat and reducing the surface temperature of the device
Data Source
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AI summary
An aerosol provision device is provided. The device comprises a receptacle configured to receive aerosol generating material, wherein the aerosol generating material is heatable by a susceptor. The device further comprises an inductor coil extending around the receptacle, wherein the inductor coil is configured to generate a varying magnetic field for heating the susceptor. The device further comprises a magnetic shield member extending at least partially around the inductor coil.