Aerosol Device Dome Filter Retains Large Droplets

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Solution Overview

Problem

Aerosol-generating devices face challenges in controlling the amount of liquid precursor on the heater, leading to spitting of large droplets into the airflow path, which negatively affects the vaping experience and can cause further spitting due to filter saturation.

Innovation Solution

The implementation of a filtering system with a dome, cone, or pyramid-shaped porous partition in the aerosol-generating device's airflow path, which directs excess liquid collected from blocked droplets to a storage arrangement, thereby maintaining filter efficiency over a longer service time.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an outlet filter is used to block large precursor droplets, then spitting is suppressed and vaping experience is improved, but the filter becomes saturated over time causing liquid to accumulate and flow back to the heater

Engineering Contradiction:

Improvefilter efficiencyVSAvoidservice time

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The filtering system is divided into two functional parts: a filtering porous partition for blocking droplets and a liquid-storage arrangement for collecting liquid. This segmentation allows each component to perform its specific function optimally - the partition maintains filtering efficiency while the storage arrangement manages liquid accumulation, preventing filter saturation over time.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A liquid-absorbing material is introduced as an intermediary between the filtering porous partition and the heater. This intermediary absorbs excess liquid that accumulates on the partition, preventing it from flowing back to the heater and causing spitting, thereby extending the service time while maintaining filtering effectiveness.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the filter retains large precursor droplets, then spitting is reduced, but liquid collected from blocked droplets accumulates at the filter causing further spitting

Engineering Contradiction:

ImprovespittingVSAvoidliquid accumulation

Core Design Contradiction:

Object-affected harmful factorsVSQuantity of substance

Solution Approach 1:

The liquid that would normally be harmful (causing spitting when it accumulates) is converted into a manageable substance by introducing a liquid-absorbing material. This material absorbs the excess liquid in a controlled manner, transforming the harmful accumulation into a contained state that does not cause spitting, thus converting the harmful effect into a benign situation.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The system discards the harmful effect of liquid accumulation by using the liquid-absorbing material to capture and retain the excess liquid. The absorbed liquid is effectively removed from the problematic area (filter surface) and held in a controlled state, preventing it from causing further spitting while maintaining the filtering function.

Inventive Principle:

Principle #34Discarding and recovering

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 spitting by retaining large droplets and managing excess liquid, enhancing the vaping experience and extending the service time of the aerosol-generating device.

Implementation Method 1

a filtering system which is arranged in the airflow path and configured to retain droplets of more than 500 μm (micrometer), preferably of more than 300 μm, in diameter from the aerosol

Methodology Applied

Scientific EffectPhysical filtration: Filter (physical)

Implementation Method 2

Thanks to such shape for the filtering porous partition, liquid collected by the filtering system from precursor droplets which have been blocked by the filtering porous partition can flow in this latter towards a liquid-storage arrangement

Methodology Applied

Scientific EffectGravity: Gravitation

Data Source

PatentUS20250024884A1Aerosol-Generating Device with Filtering System

Publication Date: 2025.01.23 JT INTERNATIONAL SA

AI summary

An aerosol-generating device includes a filtering system configured to retain droplets of more than 500 μm. The filtering system includes a filtering porous partition that is shaped as a dome or a cone or a pyramid, for the liquid collected from retained droplets to flow to outside of a center part of the filtering porous partition.