Thin-Walled Tubular Heating Element for Uniform Induction Heating
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Solution Overview
Problem
Existing smoking alternatives, such as heat-not-burn products, face challenges in efficiently heating aerosolisable materials without combustion, particularly in achieving uniform heat distribution and cost-effective design.
Innovation Solution
A tubular heating element with a wall thickness of no more than 1 millimeter, comprising a ferromagnetic coating and a heat-resistant protective layer, is heated by a varying magnetic field, allowing for efficient Joule and magnetic hysteresis heating, and is designed to minimize thermal mass for rapid temperature rise and uniform heat distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the wall thickness of the tubular heating element is reduced to minimize thermal mass, then heating speed improves, but structural strength and heat distribution uniformity deteriorate
Solution Approach 1:
The heating element employs a composite structure combining a ferromagnetic material (for induction heating) with a protective coating layer. This composite design allows the thin-walled tube to maintain structural integrity while enabling efficient electromagnetic heating and uniform heat distribution across the material surface.
2Loss of time
If the wall thickness is reduced for rapid heating, then thermal mass decreases, but manufacturing precision and quality control become more difficult
Solution Approach 1:
The patent specifies precise parameter ranges for the wall thickness (0.5-2.0mm) and incorporates a protective coating with specific thickness requirements. These controlled parameters ensure that the thin-walled heating element achieves rapid heating while maintaining manufacturability and quality consistency through defined specification ranges.
3Reliability
If a protective coating is added to the heating element, then durability and heat distribution improve, but device complexity and manufacturing cost increase
Solution Approach 1:
The protective coating is applied specifically to the outer surface of the heating element where it contacts the aerosolisable material. This localized treatment provides enhanced durability and uniform heat distribution precisely where needed, without adding complexity to the entire device structure or requiring complex manufacturing processes throughout.
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 tubular heating element achieves efficient and uniform heating of aerosolisable materials, reducing thermal mass for faster heating and maintaining system efficiency while minimizing cost and design complexity.
Implementation Method 1
heating material that is heatable by penetration with a varying magnetic field
Implementation Method 2
efficient Joule and magnetic hysteresis heating
Implementation Method 3
induction coil arrangement for use with apparatus for heating smokable material
Data Source
Figure 1~3
Figure 4~5
AI summary
Disclosed is a tubular heating element (1) for use in apparatus for heating aerosolisable material to volatilise at least one component of the aerosolisable material. The tubular heating element (2) further comprises heating material layer (lb, 2b) that is heatable by penetration with a varying magnetic field on a tubular support (2a). The tubular heating element (1, 2) has a wall thickness (T) of no more than one millimetre. Further, the tubular heating element (2) can comprises a protective layer (2c). The heating layer comprising a ferromagnetic material based on cobalt or nickel.