Fluid-Permeable Heater Assembly With Clamped Filament Contacts
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Solution Overview
Problem
Aerosol-generating systems, such as electrically operated smoking devices, require a cost-effective and simple-to-manufacture fluid permeable heater assembly that avoids the reliability issues associated with soldering and welding.
Innovation Solution
A fluid permeable heater assembly featuring a substrate with a mechanically fixed, substantially flat filament arrangement, where the clamping means provide both mechanical fixation and electrical contact, eliminating the need for soldering or welding and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional fluid permeable heaters are used, then heating function is achieved, but manufacturing cost is high and manufacturing complexity is high
Solution Approach 1:
The heater assembly is segmented into distinct functional components: substrate, filament arrangement, and clamping means. This segmentation allows each component to be optimized independently and assembled through simple mechanical means, reducing manufacturing complexity and cost while maintaining reliability.
Solution Approach 2:
The clamping means perform multiple functions simultaneously: mechanical fixation of the filament arrangement to the substrate, electrical contact with the filament, and structural support. This merging of functions reduces the number of separate components needed, simplifying manufacturing while ensuring reliable operation.
2Reliability
If soldering or welding is used to fix filament arrangement, then electrical contact is established, but reliability decreases due to cold solder joints or cold welds
Solution Approach 1:
The patent replaces thermal joining processes (soldering, welding) with a mechanical clamping system. The clamping means establish both mechanical fixation and electrical contact through direct physical contact and compression, eliminating the reliability issues of cold solder joints and cold welds while simplifying the manufacturing process.
3Ease of operation
If filament arrangement is directly connected to battery connectors, then electrical contact is achieved, but filament damage occurs upon insertion
Solution Approach 1:
The clamping means serve as an intermediary component between the filament arrangement and the battery connectors. This intermediary provides a robust mechanical and electrical interface that protects the fragile filament from direct contact with connectors, preventing filament damage during insertion and operation while maintaining reliable electrical connection.
4Ease of manufacture
If mechanical clamping is used to fix filament arrangement, then manufacturing cost is reduced, but electrical contact stability may be compromised
Solution Approach 1:
The clamping means are designed to apply optimized compression force to the filament arrangement, creating low-resistance electrical contact through controlled mechanical pressure. By adjusting the clamping force parameter, the system achieves reliable electrical contact through mechanical means alone, eliminating the need for expensive thermal joining processes while maintaining contact stability.
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 enables a reliable, cost-effective, and efficient heater assembly with improved stability and reduced risk of filament damage, facilitating the production of aerosol-generating systems with enhanced performance and durability.
Implementation Method 1
A substance is vaporized from the aerosol forming substrate, for example by a heating element. The heating element may be an at least partially fluid permeable heater
Implementation Method 2
a capillary material, which conveys the aerosol-forming substance to the heater
Data Source
AI summary
A cartridge for an aerosol-generating system is provided, including a liquid storage portion including a housing containing a liquid aerosol-forming substrate, the housing having an open end; and a heater assembly including: an electrical heating element configured to heat the substrate to form an aerosol, the heating element including a planar filament arrangement having one or more electrically conductive filaments, an electrically insulating substrate having a planar attachment face, the filament arrangement disposed on the planar attachment face, and connectors arranged at opposite ends of the heating element and forming two separate electrical contacts configured to apply power to the filament arrangement, at least a portion of the heater assembly is fluid-permeable, and the heater assembly is arranged over the open end of the housing.