Mesh Heating Element Layout for Higher Resistance in Compact Heaters
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Solution Overview
Problem
Existing mesh heaters in aerosol-generating systems face a challenge in increasing electrical resistance without increasing their size or changing the material composition.
Innovation Solution
A heating element design featuring a mesh with perpendicular filaments connected by an electrically conductive portion, allowing for increased path length and electrical resistance, utilizing filaments made of stainless steel and a higher conductivity material for the conductive portion, such as copper or brass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mesh heater size is increased to increase electrical resistance, then the electrical resistance increases, but the device size increases
Solution Approach 1:
The mesh heater is segmented into multiple filament sections (first filaments extending in a first direction, second filaments extending in a second direction) that are electrically connected in series. This segmentation allows the current to traverse a longer path through multiple smaller segments rather than requiring a single large continuous mesh, thereby increasing resistance without proportionally increasing the overall mesh area.
Solution Approach 2:
The patent introduces a multi-dimensional filament arrangement where filaments extend in perpendicular directions (first direction and second direction) and are electrically connected at intersections. This dimensional arrangement creates a three-dimensional current path within a two-dimensional mesh structure, effectively increasing the electrical path length and resistance without expanding the mesh footprint area.
2Power
If the mesh heater size is increased to increase heat output, then the heat output increases, but the device size increases
Solution Approach 1:
The mesh is divided into multiple filament segments connected in series, which increases the total electrical resistance. According to the power formula P=I²R, for a given current, increased resistance directly increases heat output. This segmentation strategy enables higher power output within a compact mesh area by optimizing the electrical circuit configuration rather than simply enlarging the mesh dimensions.
Solution Approach 2:
By arranging filaments in perpendicular directions and connecting them at intersections, the patent creates a multi-dimensional current distribution pattern. This increases the effective heating path length and the number of resistive elements within the same area, thereby increasing total heat output without proportionally increasing the mesh heater area.
3Reliability
If the filament thickness is decreased to increase electrical resistance, then the electrical resistance increases, but the mechanical strength decreases
Solution Approach 1:
Instead of using a single thin filament that would be mechanically weak, the patent segments the heating element into multiple filaments of moderate thickness. These segments are connected in series through electrical connections at intersections. Each individual filament maintains sufficient thickness for mechanical strength, while the series configuration of multiple segments achieves the desired high total resistance.
Solution Approach 2:
The mesh heater employs a composite structure combining metal filaments (providing mechanical strength) with conductive material connections (providing electrical continuity). This composite approach allows the use of thicker, stronger filaments while maintaining high electrical resistance through the series connection architecture and the use of materials with optimized conductivity-strength properties.
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 enhances the heat output of the heating element while maintaining a compact size, facilitating efficient vaporization of aerosol-forming substrates with reduced power consumption.
Implementation Method 1
An electric current can be passed through the mesh to resistively heat the heater and thereby generate an aerosol from the aerosol-forming substrate
Implementation Method 2
The electrically conductive portion electrically connects the second end of each of the first filaments to the third end of every second filament
Data Source
AI summary
There is provided a heating element (11) for an aerosol-generating system, the heating element (11) comprising a mesh (12). The mesh (12) comprises a plurality of first filaments (20) extending in a first direction (21), wherein each of the first filaments (20) comprises a first end (24) and a second end (26). The mesh (12) also comprises a plurality of second filaments (22) extending in a second direction (23), wherein the first direction (21) is perpendicular to the second direction (23). Each of the second filaments (22) comprises a third end (28) and a fourth end (30). The second ends (26) of the first filaments (20) are electrically connected to the third ends (28) of the second filaments (22).


