Multi-Layer Heater Insulation for Cooler Aerosol Housing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Aerosol-generating devices with externally positioned heaters tend to develop hotspots on the outer housing due to heat transfer, making them uncomfortable to hold and potentially exceeding 50 degrees Celsius, which affects user experience and device performance.
Innovation Solution
The implementation of a multi-layer thermal insulation system around the heater, including a heat spreader layer, radiation reflector, and additional insulation layers to reduce heat transfer via conduction, convection, and radiation, while utilizing materials with high thermal conductivity and anisotropic properties to distribute heat effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a heater is positioned externally of the aerosol-forming substrate, then the heater is closer to the outer housing which simplifies the device structure, but heat transfer to the housing increases causing hot spots and discomfort to the user
Solution Approach 1:
The patent introduces thermal insulation material as an intermediary substance positioned between the heater and the outer housing. This mediator blocks the direct heat transfer path, preventing hot spots on the housing while maintaining the external heater configuration. The insulation material acts as a thermal barrier that allows the simplified structure to coexist with acceptable temperature levels.
2Temperature
If thermal insulation material is added around the heater, then heat transfer to the housing is reduced, but the device volume increases
Solution Approach 1:
The patent employs thin film or sheet-like thermal insulation materials that can be wrapped around the heater in a conformal manner. This approach provides effective thermal insulation without requiring thick layers, thereby minimizing the volume increase. The flexible nature of these thin films allows them to adapt to the heater's geometry while maintaining a compact overall device structure.
3Temperature
If multiple layers of thermal insulation are used, then thermal insulation performance is improved, but device complexity increases
Solution Approach 1:
The patent utilizes composite insulation structures where multiple layers of different insulation materials are combined. Each layer may have different thermal properties, allowing them to work synergistically to provide superior thermal insulation. The composite approach enables better heat blocking performance while the layered structure can be systematically organized to manage complexity through functional differentiation of each layer.
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 configuration reduces the formation of hotspots, keeps the outer housing cooler, enhances user comfort, and improves aerosol generation by retaining more heat for the aerosol-forming substrate, while also protecting the control circuitry from excessive heat.
Implementation Method 1
the heat spreader layer helps to spread heat out over its area to reduce the formation of hotspots on the surface of an outer housing
Implementation Method 2
a plurality of layers of thermal insulation arranged around at least a part of the heater... reduce heat transfer via conduction, convection, and radiation
Implementation Method 3
the plurality of layers of thermal insulation comprises a radiation reflector layer
Data Source
AI summary
An aerosol-generating device is provided, including: an outer housing; a heater configured to heat an aerosol-forming substrate; and a plurality of layers of thermal insulation arranged around at least a part of the heater, the plurality of layers of thermal insulation including a first thermal insulation layer, a second thermal insulation layer, a radiation reflector layer being arranged between the first and the second thermal insulation layers, and a heat spreader layer including the outer housing of the aerosol-generating device. An aerosol-generating system is also provided, including the aerosol-generating device and an aerosol-generating article including an aerosol-generating substrate.