Fluid-Permeable Flat Filament Heater Assembly for Robust Vaporization
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Solution Overview
Problem
Existing electrically operated smoking systems face challenges in manufacturing a heater assembly that is both cost-effective and robust, with conventional wick and coil arrangements being fragile and difficult to handle.
Innovation Solution
A heater assembly comprising a flat, electrically conductive filament mesh or array fixed to an insulating substrate, with conductive contact portions allowing easy connection to a power supply, enabling efficient and reliable vaporization of liquid aerosol-forming substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional wick and coil assembly is used, then aerosol generation is effective, but the assembly is fragile and difficult to manufacture
Solution Approach 1:
The heater assembly is segmented into distinct functional layers: an electrically insulating substrate, a heater element with conductive filaments spanning an aperture, and contact portions. This segmentation allows each component to be optimized independently and assembled systematically, improving both robustness and manufacturability
Solution Approach 2:
The electrically insulating substrate acts as an intermediary between the power supply and the heater element, providing electrical isolation while mechanically supporting the heater structure. This mediator enables safe electrical connections while maintaining structural integrity
2Ease of operation
If a conventional wick and coil assembly is used, then aerosol generation is effective, but the assembly is difficult to handle
Solution Approach 1:
The heater element, contact portions, and insulating substrate are merged into a single integrated assembly. This consolidation reduces the number of separate components that need to be handled and assembled, significantly improving ease of operation while maintaining functional complexity
Solution Approach 2:
The heater assembly is designed as a universal module that can be directly connected to power supplies and integrated into various aerosol-generating devices. The standardized contact portions and compact structure enable broad applicability and simplified handling across different system configurations
3Ease of manufacture
If a flat heater element with conductive filaments is used, then manufacturing cost is reduced and robustness is improved, but contact area for vaporization must be maintained
Solution Approach 1:
The heater element transitions from a conventional three-dimensional coil structure to a two-dimensional flat structure with conductive filaments spanning an aperture. This dimensional change reduces material usage and manufacturing complexity while maintaining effective vaporization surface area through the planar arrangement of filaments
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 new heater assembly is inexpensive to produce, robust, and efficient, with improved contact area for vaporization, allowing for a reliable and simple connection to a power supply, enhancing the performance of aerosol-generating systems.
Implementation Method 1
Electric current passing through the wire causes resistive heating of the wire which vaporises the liquid in the capillary material
Implementation Method 2
heating to form an aerosol... vaporises the liquid in the capillary material
Data Source
AI summary
An aerosol-generating system is provided, including: an aerosol-generating device and a cartridge removably coupled to the device, the device including a power supply, the cartridge including a fluid-permeable electric heater assembly including: an electrically insulating substrate having an aperture therein, and a heater element fixed to the substrate and spanning the aperture and including electrically conductive filaments connected to first and second electrically conductive contact portions positioned on opposite sides of the aperture to one another, forming interstices, and allowing contact with the power supply, and the cartridge being insertable into the device in a first direction and the heater element is substantially flat and extends parallel to the first direction when the cartridge is received in the device.