Heating Chamber Insulating Layer for Aerosol Device Short Circuit Prevention
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Solution Overview
Problem
Existing aerosol generating devices, such as heat-not-burn devices, face inefficiencies in the heating process and reliability issues due to potential short circuits between thermally conductive shells and heating elements, which can affect the quality and consistency of aerosol production.
Innovation Solution
A method of manufacturing a heating chamber using a thermally conductive shell with a thin, uniformly deposited electrically insulating layer via vacuum deposition, preventing contact between the heating element and the shell, and utilizing a thin film heater with a flexible backing film and heat shrink film for secure attachment, ensuring efficient heat transfer and preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a thermally conductive shell is used for heating the aerosol substrate, then heat transfer efficiency is improved, but the risk of short circuit between the heating element and shell increases
Solution Approach 1:
An electrically insulating layer is introduced as an intermediary between the heating element and the thermally conductive shell. This layer prevents direct electrical contact and potential short circuits while maintaining thermal coupling through its thermally conductive properties, thus resolving the contradiction between heat transfer efficiency and short circuit prevention
Solution Approach 2:
The heating assembly uses a composite structure combining materials with different properties: the electrically insulating layer has high electrical resistance but adequate thermal conductivity, while the shell provides high thermal conductivity. This composite approach allows simultaneous achievement of electrical isolation and thermal efficiency
2Reliability
If an electrically insulating layer is added between the heating element and shell, then short circuit prevention is improved, but thermal energy transfer is reduced
Solution Approach 1:
The electrically insulating layer exhibits local quality differentiation: it provides high electrical insulation where needed to prevent short circuits, while maintaining sufficient thermal conductivity in the same region to allow efficient heat transfer. This localized property optimization resolves the contradiction between electrical isolation and thermal efficiency
Solution Approach 2:
The insulating layer's thickness and material composition are optimized to achieve the right balance: thin enough to allow effective thermal coupling, but sufficient to provide adequate electrical insulation. By adjusting these parameters, both reliability and thermal efficiency requirements are satisfied
3Reliability
If a thick electrically insulating layer is used to prevent short circuits, then reliability is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The electrically insulating layer is applied as a thin disposable coating rather than a thick structural component. This approach provides sufficient electrical insulation without adding significant complexity to the device structure or manufacturing process, resolving the contradiction between reliability improvement and manufacturing simplicity
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 enhances the efficiency and reliability of the heating process, maintaining high thermal energy transfer while preventing short circuits, resulting in improved aerosol production quality and device performance.
Implementation Method 1
depositing a layer of electrically insulating material onto an outer surface of the thermally conductive shell of the heating chamber using vacuum deposition
Implementation Method 2
the layer of electrically insulating material acts to prevent a short circuit between the thermally conductive shell and the heating element, and the reduced thickness of the electrically insulating material layer optimises the thermal energy transfer to the thermally conductive shell
Data Source
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AI summary
A method (300) of manufacturing a heating chamber (200) for an aerosol generating device (100) is disclosed. The method (300) comprises: providing a heating chamber (200) comprising a thermally conductive shell (202) and an opening (204) for receiving an aerosol substrate within the heating chamber (200); depositing a layer of electrically insulating material (206) onto an outer surface (203) of the thermally conductive shell (202) of the heating chamber (200) using vacuum deposition; and attaching a heating element (208) to the heating chamber (200) such that the heating element (208) is in contact with the layer of electrically insulating material (206), wherein the layer of electrically insulating material (206) prevents any contact between the heating element (208) and the thermally conductive shell (202).