Fluid-Permeable Heater Cap Structure for Dry-Heating Prevention
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Solution Overview
Problem
Existing aerosol-generating systems with fluid permeable heating elements face fragility issues and complex manufacturing processes, which affect the stability and efficiency of vaporizing aerosol-forming substrates.
Innovation Solution
A heater assembly with a cap and a substantially flat, electrically conductive heating element that is fluid permeable, featuring a mesh design with varying densities and a capillary medium system to enhance stability and vaporization efficiency, where the heating element is mounted on a holder and integrated with a capillary transport material to ensure consistent substrate contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fluid permeable heating element is used for vaporization, then vaporization efficiency is improved, but the structural fragility increases
Solution Approach 1:
The heating element is designed as a porous or mesh structure that allows liquid aerosol-forming substrate to pass through while being heated. This porous design enables efficient vaporization by increasing the surface area contact between the heating element and the liquid substrate, while the cap provides structural support to prevent fragility
Solution Approach 2:
The heater assembly combines multiple materials with different properties: the heating element (metallic or ceramic for heat resistance), the cap (structurally strong material for support), and the holder (material for mechanical stability). This composite structure allows the heating element to maintain its fluid permeable nature for efficient vaporization while the cap and holder provide the necessary structural strength
2Reliability
If a complex heater assembly structure is used to improve stability, then structural stability is improved, but manufacturing complexity increases
Solution Approach 1:
The heater assembly is divided into distinct functional components: the heating element, the cap, and the holder. Each component is manufactured separately with optimized simplicity, then assembled together. This segmentation allows each part to be manufactured using simple, cost-effective processes while the overall assembly achieves the required structural stability
Solution Approach 2:
The cap and holder are designed to work together as an integrated support structure. The cap is positioned to cover the heating element and provide structural support, while the holder secures the heating element in place. This merging of support functions into a unified structure simplifies the overall design compared to using multiple separate support components
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 solution improves the stability and manufacturing simplicity of the heater assembly, allowing for efficient vaporization of aerosol-forming substrates while reducing the risk of 'dry heating' and enhancing the rigidity of the assembly.
Implementation Method 1
a capillary medium like an elongated wick soaked in the liquid aerosol-forming substrate
Implementation Method 2
The heating element is configured to vaporize an aerosol-forming substrate
Implementation Method 3
an electrically operated heater assembly acting as a vaporizer
Data Source
AI summary
A fluid permeable heater assembly for an aerosol-generating system includes a cap and a substantially flat electrically conductive and fluid permeable heating element. The cap includes a hollow body with a first cap opening and a second cap opening. The first cap opening is opposite to the second cap opening. The heating element is configured to vaporize aerosol-forming substrate. The heating element is mounted on the cap, such that the heating element extends across the first cap opening. A cartridge for an aerosol-generating system includes the heater assembly, a liquid storage portion, a mouth piece, and a retainer.