Flat-Shaped Heating Chamber with Varying Wall Spacing

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Solution Overview

Problem

Heat-not-burn devices face challenges in achieving high heating efficiency and easy insertion/extraction of flat-shaped tobacco articles due to difficulties in maintaining tight contact with heaters while preventing heat wastage and ensuring efficient cooling.

Innovation Solution

A flat-shaped heating chamber with varying distances between chamber contact walls, allowing only the substrate part of the tobacco article to be compressed for efficient heating and the cooling part to be spaced out for reduced heat exchange, enhancing both heating and cooling efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If the flat-shaped tobacco article is compressed along its whole length to ensure tight contact with heaters, then heating efficiency is improved, but insertion and extraction become difficult for the user

Engineering Contradiction:

Improveheating efficiencyVSAvoidinsertion and extraction ease

Core Design Contradiction:

Loss of energyVSEase of operation

Solution Approach 1:

The heating chamber comprises at least two chamber contact walls facing each other with varying distances: in the first portion adjacent to the closed end, the distance is smaller to compress the substrate part for efficient heating, while in the second portion adjacent to the open end, the distance is greater to allow easy insertion and extraction of the cooling part without compression

Inventive Principle:

Principle #3Local quality

2Stability of the object's composition

If the cooling part of the tobacco article is in tight contact with chamber walls, then structural support is improved, but heat exchange increases causing heat wastage

Engineering Contradiction:

Improvestructural supportVSAvoidheat wastage

Core Design Contradiction:

Stability of the object's compositionVSLoss of energy

Solution Approach 1:

The chamber contact walls are arranged so that in the second portion of the heating chamber, the distance between walls is greater, allowing the cooling part to be spaced out from the walls. This decreases heat exchange in the cooling part while maintaining structural support through the chamber configuration

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If the distance between chamber contact walls is uniform throughout, then manufacturing is simplified, but heating efficiency decreases due to heat wastage in non-substrate areas

Engineering Contradiction:

Improvechamber manufacturing simplicityVSAvoidheat wastage

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The heating chamber features varying distances between chamber contact walls along its length: smaller distance in the first portion for efficient substrate heating, and greater distance in the second portion to reduce heat wastage in the cooling part, optimizing thermal efficiency while maintaining manufacturability

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 design improves heating efficiency by focusing heat on the substrate and maintains easy insertion and extraction of the tobacco article, minimizing heat wastage and enhancing user experience.

Implementation Method 1

heat, rather than burn, the substrate by conduction, convection and/or radiation, to generate aerosol for inhalation

Methodology Applied

Scientific EffectConduction (thermal): Conduction (thermal)

Implementation Method 2

heat, rather than burn, the substrate by conduction, convection and/or radiation, to generate aerosol for inhalation

Methodology Applied

Scientific EffectConvection: Convection

Implementation Method 3

heat, rather than burn, the substrate by conduction, convection and/or radiation, to generate aerosol for inhalation

Methodology Applied

Scientific EffectRadiation (thermal): Thermal Radiation

Implementation Method 4

only a part of the flat-shaped tobacco article can be compressed to ensure a tight contact with the chamber contact walls

Methodology Applied

Scientific EffectCompression: Compression

Implementation Method 5

the cooling part can be spaced out from the chamber contact walls. Thus, the heat exchange is decreased in the cooling part of the article making the cooling more efficient

Methodology Applied

Scientific EffectThermal Insulation: Thermal Insulation

Data Source

PatentUS20240349802A1Aerosol Generating Device Comprising a Flat-Shaped Heating Chamber and Associated Aerosol Generating Assembly

Publication Date: 2024.10.24 JT INTERNATIONAL SA

AI summary

An aerosol generating device includes a heating chamber extending along a chamber axis between a closed end and an open end, the heating chamber being flat-shaped and configured to receive through its open end a flat-shaped tobacco article and defining a first portion adjacent to the closed end and a second portion adjacent to the open end, the heating chamber including at least two chamber contact walls facing each other and extending through both portions of the heating chamber, the chamber contact walls being arranged so that the distance between these walls in the second portion of the heating chamber is greater than the distance between these walls in the first portion of the heating chamber.