Induction Heater Assembly for Aerosol Devices With Thermal Isolation

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Solution Overview

Problem

Existing aerosol provision devices for tobacco and other aerosol generating materials face challenges in efficiently heating the materials without burning, while maintaining a safe outer temperature and minimizing heat transfer to surrounding components.

Innovation Solution

The aerosol provision device employs a heater assembly with a susceptor heated by a varying magnetic field generated by an inductor coil, utilizing an insulating layer and support members to control heat distribution, including aerogel and thermoplastic materials, to maintain efficient heating within the device and keep the outer components at a safe temperature.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a heater assembly with inductor coil is used to heat aerosol generating material, then heating efficiency is improved, but heat transfer to surrounding components increases causing unsafe outer temperatures

Engineering Contradiction:
Improveheating efficiencyVSAvoidouter temperature
Core Design Contradiction:
ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent divides the heating system into distinct segments: an inner susceptor that directly contacts the aerosol generating material, an inductor coil for generating the magnetic field, and multiple insulating layers positioned between the susceptor and outer shell. This segmentation allows the heating function to be concentrated in the inner susceptor while isolating the outer components from excessive heat, resolving the contradiction between heating efficiency and outer temperature safety.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent introduces insulating layers as intermediary elements between the heat-generating susceptor and the outer shell. These insulating layers act as thermal barriers that mediate the heat transfer process, allowing efficient heating of the material while preventing excessive heat from reaching the outer components. The intermediary insulating layers effectively decouple the heating efficiency from the outer temperature, resolving the technical contradiction.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If insulating layers are added between susceptor and inductor coil, then heat transfer to outer components is reduced, but device complexity increases

Engineering Contradiction:
Improveheat transferVSAvoiddevice complexity
Core Design Contradiction:
Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent employs a nested structure where the susceptor is positioned within the inductor coil, and insulating layers are nested between these components. The support member provides a nested framework that holds the inductor coil at a defined distance from the susceptor. This nested arrangement systematically organizes multiple functional layers (susceptor, insulation, coil, support member) in a compact configuration, reducing heat transfer while managing the inherent complexity through structured nesting rather than random addition of components.

Inventive Principle:
Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent utilizes composite material structures, particularly using aerogel as an insulating material which provides exceptional thermal insulation properties in a thin layer. The combination of different materials (aerogel, thermoplastic, air gaps) creates a composite insulation system that achieves effective heat blocking with minimal thickness, thereby reducing heat transfer to outer components while minimizing the increase in device complexity that would result from thicker or multiple separate insulation layers.

Inventive Principle:
Principle #40Composite materials

3Stability of the object's composition

If support member extends between susceptor and inductor coil, then structural stability is improved, but thermal insulation effectiveness may be reduced

Engineering Contradiction:
Improvestructural stabilityVSAvoidheat transfer
Core Design Contradiction:
Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by making the support member thermally insulating rather than conductive. The support member is specifically positioned and designed to provide both mechanical stability (maintaining the geometric relationship between susceptor and coil) and thermal insulation (reducing heat transfer pathways). This localized insulating support member resolves the contradiction by ensuring that the structural stability function does not compromise thermal insulation, as the support member itself becomes part of the insulation system rather than a thermal bridge.

Inventive Principle:
Principle #3Local quality

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 allows for efficient heating of aerosol generating materials to temperatures between 200°C and 350°C, while keeping the outer cover temperature below 60°C, ensuring safe operation and minimizing heat transfer to surrounding components.

Implementation Method 1

an inductor coil at least partially extending around the susceptor, wherein the inductor coil is configured to generate the varying magnetic field

Methodology Applied
Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

a susceptor which is heatable by penetration with a varying magnetic field

Methodology Applied
Scientific EffectInduction heating: Induction Heating

Implementation Method 3

an insulating layer extending between the susceptor and the inductor coil

Methodology Applied
Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentUS20230363458A1Aerosol provision device
Publication Date: 2023.11.16 NICOVENTURES TRADING LTD
  • US20230363458A1 patent drawing
  • US20230363458A1 patent drawing
  • US20230363458A1 patent drawing

AI summary

An aerosol provision device is described. One such device has a heater assembly configured to receive aerosol generating material. The heater assembly has a susceptor which is heatable by penetration with a varying magnetic field. An inductor coil extends at least partially around the susceptor and generates the varying magnetic field. A support member extends between the susceptor and the inductor coil. An insulating layer extends between the susceptor and the inductor coil.