Sealed Airflow Heater Assembly with Spaced Seal to Reduce Heat Loss

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Solution Overview

Problem

Existing aerosol-generating devices face issues with inefficient energy use, aerosol leakage due to manufacturing tolerances, and uneven heating of aerosol-forming substrates, leading to reduced aerosol delivery and potential contamination from polymer seals.

Innovation Solution

A heater assembly design with a seal mounted on a heater mount spaced apart from the heating chamber, allowing for improved sealing, reduced heat loss, and better tolerance absorption, using a polymer seal to maintain airflow pathway integrity and enhance heating efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If seals are placed in direct contact with the heating chamber to prevent aerosol leakage, then sealing reliability is improved, but heat-resistant polymer seals generate undesirable by-products and degrade over time due to exposure to high heating temperatures

Engineering Contradiction:

Improvesealing reliabilityVSAvoidheat exposure to seals

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces an air gap as an intermediary space between the heating chamber and the seal, preventing direct thermal contact while maintaining sealing functionality. This air gap acts as a thermal barrier that protects the polymer seal from degradation by high temperatures while still allowing the seal to prevent aerosol leakage effectively.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent segments the heating chamber structure by separating the heating chamber from the seal mounting surface, creating distinct functional zones. The heating chamber is positioned to face away from the seal, allowing independent optimization of heating efficiency and seal protection without compromise.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the heating chamber length is increased to accommodate seals at downstream end, then sealing is improved, but energy consumption increases and heating efficiency decreases

Engineering Contradiction:

ImprovesealingVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The air gap serves as a compact intermediary solution that provides effective sealing without requiring extended heating chamber length. This eliminates the need for additional heating zone while maintaining seal protection, thereby reducing energy consumption and preserving heating efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If the heating element length is decreased, then device complexity is reduced, but portions of aerosol-forming substrate are not adequately heated leading to aerosol condensation

Engineering Contradiction:

Improveheating element lengthVSAvoidsubstrate heating uniformity

Core Design Contradiction:

Device complexityVSTemperature

Solution Approach 1:

The air gap and heater mount structure act as thermal management intermediaries that concentrate heating efficiency in the reduced heating element length. By protecting seals from heat and reducing heat loss to surrounding components, the system maintains effective heating with a shorter heating element, avoiding substrate condensation issues.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Reliability

If polymer seals are used between heating chamber and housing, then sealing is achieved, but heat conduction path transfers heat away from heating chamber reducing efficiency

Engineering Contradiction:

ImprovesealingVSAvoidheat loss

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The air gap acts as a thermal insulation intermediary that breaks the heat conduction path between the heating chamber and the housing. This prevents heat loss to surrounding components while maintaining sealing integrity, thereby improving overall thermal efficiency of the heating system.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

The design achieves improved sealing, reduced energy consumption, and consistent aerosol delivery by minimizing heat transfer to seals and accommodating manufacturing tolerances, ensuring effective heating of aerosol-forming substrates.

Implementation Method 1

a heating chamber for heating an aerosol-forming substrate to generate an aerosol

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

The seal is mounted on the heater mount such that it is spaced apart from the heating chamber... reduced heat loss... minimizing heat transfer to seals

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentEP4316203B1Heater assembly having a sealed airflow pathway

Publication Date: 2025.08.20 PHILIP MORRIS PRODUCTS SA

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Figure 3A~3D

AI summary

A heater assembly (1) for an aerosol-generating device, the heater assembly (1) comprising: a first heater casing (2) comprising an air inlet; a second heater casing (4) comprising an aerosol outlet (10); and a heating chamber (6) for heating an aerosol-forming substrate, the heating chamber (6) being in fluid communication with both the air inlet and aerosol outlet (10) to define an airflow pathway through the heater assembly; the heater assembly (1) further comprising: a heater mount (8), the heating chamber (6) being mounted on the heater mount (8); and a seal (30) for sealing the airflow pathway; wherein the seal (30) is mounted on the heater mount (8) such that the seal (30) is spaced apart from the heating chamber (6).