Variable-Width Airflow Guiding Element for Uniform Substrate Heating
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Solution Overview
Problem
Existing aerosol-generating devices face inefficiencies in heating aerosol-generating substrates, leading to uneven aerosol generation and waste of substrate material, with prolonged pre-heating times and suboptimal delivery.
Innovation Solution
An aerosol-generating device with a heating chamber and an airflow guiding element that extends into the aerosol-generating article, ensuring uniform heating and efficient aerosol production by optimizing substrate alignment and airflow dynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an external heating element is used to heat a rod of aerosol-generating substrate, then the heating structure is simple and easy to manufacture, but the central portion of the rod is unlikely to generate as much aerosol as the outer portions and in some cases may not generate any aerosol
Solution Approach 1:
The heating system is segmented into multiple independent heating zones along the length of the rod. Each heating zone can be independently controlled to heat different portions of the aerosol-generating substrate, ensuring uniform aerosol generation from both outer and central portions of the rod.
Solution Approach 2:
A heat-conducting intermediary element (such as a metal rod or heat distribution fin) is introduced between the external heating element and the aerosol-generating substrate. This intermediary distributes heat more uniformly throughout the substrate, including the central portion, thereby improving aerosol generation efficiency.
2Productivity
If the aerosol-generating substrate is heated to a sufficiently high temperature for aerosol generation, then aerosol can be generated from all portions of the substrate, but there is a pre-heating time after activation of a heating element during which no aerosol is generated
Solution Approach 1:
The heating element is pre-heated to the required temperature before the aerosol-generating substrate is inserted into the heating chamber. This preliminary heating action eliminates the pre-heating delay, allowing aerosol generation to begin immediately upon substrate insertion.
Solution Approach 2:
The heating system uses variable temperature control with higher initial heating power that gradually reduces to maintenance power. This parameter change allows rapid initial heating to eliminate pre-heating time, followed by efficient sustained operation.
3Ease of manufacture
If the width or external diameter of the airflow guiding element is uniform along its length, then the manufacturing process is simple, but the airflow dynamics are not optimized for efficient aerosol generation
Solution Approach 1:
The airflow guiding element has different width or diameter at different portions along its length. The wider portion is located where enhanced aerosol generation is needed, while the narrower portion is located where optimized airflow direction is needed. This local quality variation optimizes both aerosol generation and delivery efficiency.
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
Enhances aerosol generation efficiency, reduces substrate waste, and shortens pre-heating times while maintaining cost-effectiveness and compatibility with various heating devices.
Implementation Method 1
an aerosol is generated by the transfer of heat from a heat source to a physically separate aerosol-generating substrate or material
Implementation Method 2
volatile compounds are released from the aerosol-generating substrate by heat transfer from the heat source and are entrained in air drawn through the aerosol-generating article
Data Source
AI summary
An aerosol-generating system is provided, including: an aerosol-generating device having a mouth end; and an aerosol-generating article, the device including: a heating chamber to receive and heat the article, and an airflow guiding element within the chamber and extending longitudinally towards the mouth end, the element to be inserted into the article upon receipt within the chamber, a width or external diameter of the element varying along a length thereof, and a first portion of the element having a width or external diameter corresponding to a maximum width or external diameter of the element, and a second portion of the element located upstream of the first portion having a width or external diameter smaller than the maximum width or external diameter, the article including: an aerosol-generating substrate as a hollow tubular segment defining a substrate cavity extending from an upstream end to a downstream end of the substrate.