Insert Sleeve Airflow Path for Aerosol Article Draw Resistance
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Solution Overview
Problem
Aerosol-generating devices experience pressure drops in airflow due to the porosity of the aerosol-forming substrate, leading to resistance to draw (RTD) issues.
Innovation Solution
An insert sleeve is integrated into the device chamber to block airflow along the outer surface of the aerosol-forming substrate, redirecting airflow through an alternative path along the sleeve's inner surface, utilizing channels and ridges to manage airflow dynamics and control RTD.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heating element is inserted into the cartridge to heat the liquid, then the liquid can be vaporized to form an aerosol, but the cartridge becomes more difficult to replace and the risk of contamination increases
Solution Approach 1:
The heating element is separated from the replaceable cartridge and placed in the reusable housing. The cartridge contains only the liquid reservoir and nozzle, allowing it to be easily replaced without handling the heating element. This segmentation resolves the contradiction by enabling temperature control through the heating element while maintaining simple cartridge replacement.
Solution Approach 2:
The patent introduces an intermediary heating element that sits between the power source and the liquid in the cartridge. This heating element is held by the housing and not by the cartridge, serving as a mediator that enables heating functionality while allowing the cartridge to remain simple and easily replaceable.
2Ease of operation
If the cartridge is designed to be disposable for simplicity, then replacement is easy, but integrating a heating element makes it more complex and harder to replace
Solution Approach 1:
The system is segmented into two distinct parts: a simple disposable cartridge containing only liquid and a nozzle, and a reusable housing containing the heating element and electronics. This segmentation maintains ease of cartridge replacement while enabling heating functionality in the reusable portion.
Solution Approach 2:
Instead of placing the heating element in the disposable cartridge as conventionally done, the patent inverts the arrangement by placing the heating element in the reusable housing. This inversion allows the cartridge to remain simple and easily replaceable while still achieving the heating function.
3Ease of manufacture
If the heating element is held by the cartridge, then assembly is simple, but the cartridge becomes contaminated and cannot be properly replaced
Solution Approach 1:
The heating element is segmented from the cartridge and held by the housing instead. This segmentation prevents contamination of the cartridge while maintaining ease of assembly, as the heating element is simply positioned in the housing and electrically connected, without requiring integration with the cartridge structure.
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
Reduces pressure drops and improves airflow management, achieving a controlled resistance to draw (RTD) within the desired range, enhancing the user experience.
Implementation Method 1
a processor configured to control the heater to heat the liquid in the cartridge
Implementation Method 2
the heater to heat the liquid in the cartridge and vaporize the liquid
Data Source
Figure 1a~2b
Figure 2c~3b
Figure 4a~4c
AI summary
The present invention relates to an aerosol-generating device for use with an aerosol-generating article. The device comprises a chamber within a device housing for removably receiving at least a portion of the aerosol-generating article. The chamber has a chamber inner surface and a proximal open end for insertion of the article into the chamber. The device further comprises an insert sleeve separate from the device housing, wherein the insert sleeve is fixedly arranged in the device such that at least a portion of the insert sleeve extends along at least a proximal portion of the chamber inner surface. The insert sleeve comprises a sleeve outer surface and a sleeve inner surface. In a contact portion of the insert sleeve the sleeve inner surface is configured to come into circumferentially closed contact with a circumference of the aerosol-generating article when received in the chamber. At least a proximal portion of an airflow path through the device extends along the sleeve outer surface.