Aerosol Piercing Assembly with Integrated Heaters for Leak Reduction
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Solution Overview
Problem
Existing electrically heated aerosol-generating devices face challenges in efficiently heating and delivering aerosol from consumable cartridges, often resulting in liquid leakage and inconsistent aerosol production due to complex heater assemblies and fragile seals.
Innovation Solution
A two-part piercing assembly with hollow shaft portions and integrated electric heaters that pierce frangible seals, forming an internal airflow passage, allowing for even heating and reduced leakage, with the heaters being fixed to the assembly for simplified and robust cartridge design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a complex heater assembly is used to heat the aerosol-forming substrate, then heating efficiency is improved, but device complexity increases and manufacturing cost increases
Solution Approach 1:
The piercing assembly and heater assembly are merged into a single integrated component. The piercing assembly includes a piercing member and a heater element combined in one structure, allowing the same component to both pierce the frangible seal and heat the aerosol-forming substrate. This reduces the number of separate parts and simplifies the overall device structure while maintaining heating efficiency.
Solution Approach 2:
The piercing assembly serves multiple functions: it pierces the frangible seal at the cartridge end, provides a structural support for the heater element, and acts as part of the aerosol delivery pathway. This multi-functionality reduces the need for separate components and simplifies the heater assembly design.
2Reliability
If traditional sealing methods are used in the cartridge, then sealing reliability is maintained, but liquid leakage occurs during insertion and operation
Solution Approach 1:
A frangible seal is provided at the end of the cartridge that is designed to be broken during the insertion process. The piercing assembly includes a piercing member that intentionally breaks the frangible seal when the cartridge is inserted into the device, creating an open pathway for aerosol delivery while preventing liquid leakage through proper sealing around the piercing member.
Solution Approach 2:
The piercing assembly acts as an intermediary between the cartridge and the device housing. It provides a controlled interface that pierces the frangible seal and creates a sealed pathway through the cartridge end, mediating the connection between the aerosol-forming substrate and the external environment while preventing leakage.
3Reliability
If a robust cartridge design is used to prevent leakage, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The cartridge is segmented into distinct functional components: an aerosol-forming substrate portion, a frangible seal at the end, and a filtering element. This segmentation allows each component to be manufactured separately using optimized processes and then assembled, reducing overall manufacturing complexity and cost while maintaining cartridge robustness and reliability.
Solution Approach 2:
The frangible seal is designed as a disposable, low-cost component that is broken during insertion and not replaced. This approach uses an inexpensive, easily manufactured seal that provides sufficient functionality for its intended purpose without requiring high manufacturing standards or costly materials.
4Device complexity
If an integrated piercing and heater assembly is used, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
By combining the piercing member and heater element into a single integrated piercing assembly, the number of separate parts is reduced. This integration simplifies the assembly process and reduces the cumulative precision requirements that would arise from aligning multiple separate components, while still requiring precision in the manufacturing of the integrated component itself.
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 consistent aerosol delivery, reduces liquid leakage, and lowers manufacturing costs by simplifying the cartridge design, while allowing for more efficient heating and cost-effective production of aerosol-generating devices.
Implementation Method 1
The heater assembly includes at least one electric heater fixed to the elongate piercing assembly. The at least one electric heater has at least one heating element configured to heat the aerosol forming substrate when the cartridge is enclosed in the cavity.
Implementation Method 2
The first piercing surface is configured to break through a first frangible seal across a first end of the open ended passage when the cartridge is inserted into the cavity.
Data Source
AI summary
An electrically heated aerosol-generating device includes a main housing having a cavity, a closure body engageable with the main housing to enclose a cartridge in the cavity, and a heater assembly. The heater assembly includes an elongate piercing assembly configured to extend into the open-ended passage of the cartridge and one or more electric heaters. The piercing assembly has a first hollow shaft portion connected to the main housing and a second hollow shaft portion connected to the closure body. The first and second hollow shaft portions have first and second piercing surfaces configured to breakthrough first and second frangible seals when the cartridge is enclosed in the cavity.