Evacuated Thermal Insulation for Induction-Heated Aerosol Chambers
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Solution Overview
Problem
Existing methods for manufacturing thermal insulators for aerosol provision devices face challenges in efficiently connecting dissimilar materials under low atmospheric pressure conditions, which complicates the integration of effective thermal insulation and heating elements without compromising device size or safety.
Innovation Solution
A method involving the use of dissimilar materials for inner and outer walls, where the inner wall is heatable by a varying magnetic field, and the outer wall is not, with joining materials applied under atmospheric pressure and the insulation region evacuated to a lower pressure to form a sealed thermal insulator, reducing manufacturing complexity and enhancing thermal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If joining materials are attached under atmospheric pressure and the insulation region is evacuated to lower pressure, then thermal insulation efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The joining materials are attached to the inner and outer walls under atmospheric pressure before the insulation region is evacuated to lower pressure. This preliminary action allows the joining process to occur under more favorable pressure conditions, simplifying manufacturing while still achieving the thermal insulation benefits of the evacuated space.
Solution Approach 2:
The patent utilizes a change in pressure parameter during manufacturing - starting with atmospheric pressure for joining material attachment, then evacuating to lower pressure to create the thermal insulation effect. This parameter change enables both easy joining and effective thermal insulation in the same device.
2Loss of energy
If dissimilar materials are used for inner and outer walls, then thermal insulation performance is improved, but ease of manufacture deteriorates
Solution Approach 1:
The joining materials are attached to the dissimilar inner and outer wall materials under atmospheric pressure before evacuation, when handling and joining is easier. This preliminary action under favorable conditions enables the use of dissimilar materials for optimal thermal insulation without excessive manufacturing difficulty.
Solution Approach 2:
The patent employs dissimilar materials for the inner wall and outer wall to create a composite structure that optimizes thermal insulation performance. The inner wall can be optimized for heating function while the outer wall is optimized for insulation, and the joining materials bridge these dissimilar materials effectively.
3Loss of energy
If the insulation region is evacuated to lower pressure, then thermal efficiency is improved, but device complexity increases
Solution Approach 1:
The joining materials are attached under atmospheric pressure before the insulation region is evacuated to lower pressure. This sequence of operations simplifies the manufacturing process by performing joining under more favorable conditions, while still achieving the thermal efficiency benefits of the evacuated insulation region.
Solution Approach 2:
The patent utilizes a change in pressure parameter during manufacturing - starting with atmospheric pressure for joining, then evacuating to lower pressure for thermal insulation. This parameter change enables both easy manufacturing and high thermal efficiency.
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 approach allows for robust, compact aerosol provision devices with improved thermal insulation, reducing heat transfer to non-heating components and maintaining the inner wall's dual function as both heating and insulating element, while minimizing size and weight.
Implementation Method 1
the inner wall comprises heating material that is heatable by penetration with a varying magnetic field
Implementation Method 2
evacuating the insulation region to a pressure lower than atmospheric pressure
Data Source
AI summary
A method for manufacturing a thermal insulator includes providing an inner wall which is configured to at least partially define a heating zone for receiving aerosol-generating material, wherein the inner wall includes heating material that is heatable by penetration with a varying magnetic field, and providing an outer wall surrounding the inner wall at least partially along its length, an insulation region being formed between the inner wall and the outer wall, the inner wall and outer wall having different materials. The method can also include attaching a portion of a first joining material to the inner wall under atmospheric pressure, attaching a portion of a second joining material to the outer wall under atmospheric pressure, evacuating the insulation region to a pressure lower than atmospheric pressure, and closing the insulation region by joining the first joining material and second joining material to each other.