E-Vaping Section Flow Restrictor for Consistent RTD

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Solution Overview

Problem

Existing electronic smoking articles face issues with resistance-to-draw (RTD) variability due to external air vent holes being easily obstructed by the user, leading to inconsistent smoking experiences.

Innovation Solution

The electronic smoking article design incorporates a gasket with a central, longitudinal air passage to control RTD from within, ensuring airflow is not significantly impacted by user behavior, with the combined air flow area of inlets greater than the cross-sectional area of the gasket passage, and includes a connector with circumferentially spaced slots and cartomizer holes to manage airflow and resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If external air vent holes are used for airflow control, then the device structure is simple, but the resistance-to-draw becomes variable and easily obstructed by user handling

Engineering Contradiction:

Improveairflow control structureVSAvoidresistance-to-draw consistency

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The airflow control function is extracted from external vent holes and relocated to an internal flow restrictor component. This removes the vulnerability of external holes to obstruction while maintaining the airflow control function within the protected internal environment of the cartridge assembly.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

A flow restrictor component is introduced as an intermediary element between the air inlet and the heating element. This mediator component provides controlled airflow resistance through its internal structure (such as a tortuous flow path or restricted aperture) while being protected from external obstruction.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If airflow control is internalized in the cartridge assembly, then resistance-to-draw consistency is improved, but the device complexity increases

Engineering Contradiction:

Improveresistance-to-draw consistencyVSAvoidairflow control structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The flow restrictor is merged with the cartridge assembly structure, integrating the airflow control function into the existing cartridge components rather than adding a completely separate mechanism. This integration minimizes additional complexity while achieving reliable internal airflow control.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The airflow control is localized to specific regions within the cartridge assembly (such as the air inlet region or between the heating element and mouthpiece). This localized control approach provides effective RTD management without requiring complex system-wide modifications.

Inventive Principle:

Principle #3Local quality

3Reliability

If the combined air flow area of inlets is greater than the gasket passage area, then airflow is controlled primarily by the gasket, but manufacturing precision requirements increase

Engineering Contradiction:

Improveairflow control stabilityVSAvoidgasket passage dimension tolerance

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The airflow path is segmented into multiple components (inlet holes, gasket passage, flow restrictor) with the gasket passage designed as the primary flow control point. By segmenting the flow path and making the gasket passage the limiting factor, the system achieves stable RTD control while distributing manufacturing tolerances across multiple features.

Inventive Principle:

Principle #1Segmentation

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 maintains consistent RTD and reduces the impact of user handling on airflow, providing a stable smoking experience by internalizing the resistance control and ensuring airflow is not disrupted by external obstructions.

Implementation Method 1

a heater and wick arrangement in communication with the reservoir including liquid material and operative to volatilize liquid material to produce an aerosol

Methodology Applied

Scientific EffectVolatilization: Evaporation

Implementation Method 2

a gasket in fluid communication with the one or more inlets and configured to provide a seal with an interior surface of the outer cylindrical housing and having a central, longitudinal air passage configured to provide resistance-to-draw (RTD) to the smoking article

Methodology Applied

Scientific EffectFlow resistance: Pressure Drop

Data Source

PatentUS20220295900A1Method of making e-vaping section with flow restrictor to provide desired resistance-to-draw (RTD)

Publication Date: 2022.09.22 ALTRIA CLIENT SERVICES LLC

AI summary

The method includes first inserting a seal into a first end of a first housing of a first e-vaping section, the first housing at least partially defining at least one inlet, second inserting a flow restrictor into a second end of the seal, the flow restrictor defining a first air passage in communication with the at least one inlet, the flow restrictor being configured to providing a desired resistance-to-draw (RTD) for the first e-vaping section, and first connecting a connector to the first end.