E-Cigarette Airflow and Mouthpiece Design for Stable Draw

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Solution Overview

Problem

Existing electronic cigarettes often suffer from inconsistent resistance to draw (RTD) and hot spots during use, which can lead to an unpleasant smoking experience.

Innovation Solution

The electronic cigarette design incorporates a precision-formed air inlet port and a multi-ported mouth end insert with a gasket system to control RTD and prevent hot spots, ensuring consistent vapor production and mouthfeel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a heater element is used to vaporize liquid material, then vapor production is achieved, but hot spots and excessive temperatures occur during use

Engineering Contradiction:

Improveheater temperatureVSAvoidhot spots

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

The heater element is designed as a mesh structure with multiple heating zones distributed across the surface, rather than a single concentrated coil. This segmentation distributes the thermal load across many small heating points, preventing localized hot spots while maintaining overall vaporization efficiency

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The mesh heater provides uniform heat distribution across the entire liquid contact area, creating consistent local heating conditions throughout the vaporization zone rather than concentrated heating at specific points, thereby eliminating hot spots

Inventive Principle:

Principle #3Local quality

2Productivity

If vapor is delivered directly to the mouthpiece, then vapor output is achieved, but hot sensation at the lips occurs

Engineering Contradiction:

Improvevapor outputVSAvoidhot sensation at lips

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

A mouth end insert is introduced as an intermediary component between the vapor source and the user's lips. This insert provides an extended pathway that allows vapor to cool through contact with the insert walls and mixing with ambient air, reducing the temperature at the point of contact with lips while maintaining vapor delivery

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The vapor pathway is extended in the longitudinal dimension by incorporating a mouth end insert, increasing the distance and time for vapor cooling before reaching the lips, thereby reducing the hot sensation without compromising vapor output

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If precision-formed air inlet ports are used, then RTD consistency is improved, but manufacturing complexity increases

Engineering Contradiction:

ImproveRTD consistencyVSAvoidair inlet port tolerance

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

Traditional mechanical drilling or punching methods for creating air inlet ports are replaced with laser forming technology. This substitution enables precise control of port dimensions and geometry while simplifying the manufacturing process, achieving both RTD consistency and ease of manufacture

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The manufacturing method transitions from mechanical processes with inherent tolerance variations to laser-based processes that offer superior dimensional control. This parameter change in the manufacturing approach enables tight tolerances for air inlet ports without significantly increasing manufacturing complexity

Inventive Principle:

Principle #35Parameter changes

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 achieves consistent RTD and prevents hot spots, enhancing the smoking experience by providing a consistent and full mouthfeel similar to traditional cigarettes.

Implementation Method 1

a heater operable to heat the liquid material to a temperature sufficient to vaporize the liquid material and form an aerosol

Methodology Applied

Scientific EffectVaporization: Evaporation

Implementation Method 2

a wick in communication with the liquid material and in communication with the heater such that the wick delivers the liquid material to the heater

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Implementation Method 3

The heater element preferably comprises a resistive heater coil

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS12263300B2Electronic cigarette

Publication Date: 2025.04.01 ALTRIA CLIENT SERVICES LLC

AI summary

An electronic smoking article includes a liquid supply including liquid material, a heater operable to heat the liquid material to a temperature sufficient to vaporize the liquid material and form an aerosol, a wick in communication with the liquid material and in communication with the heater such that the wick delivers the liquid material to the heater, at least one air inlet operable to deliver air to a central air passage upstream of the heater, and a mouth end insert having at least two diverging outlets.