Insulated Heater Tube Layout for Heat Loss and Short-Circuit Control
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Solution Overview
Problem
Existing aerosol-generating devices face issues with heat loss and electrical short-circuiting due to inefficient thermal insulation and electrical isolation of heating elements, leading to increased energy consumption and user safety concerns.
Innovation Solution
A heating assembly with a single substrate layer that is both electrically isolating and thermally insulating, where the heating element is sandwiched between two portions of the substrate layer, rolled into a tubular shape, using materials like polyimide and stainless steel to provide effective insulation and isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If heat dissipation is allowed to occur naturally from the heating element, then the heating element can be simple in structure, but heat losses increase resulting in less efficient heating and higher energy consumption
Solution Approach 1:
The patent introduces an electrically isolating substrate layer as an intermediary component between the heating element and the heating chamber. This substrate layer serves dual functions: it electrically isolates the heating element to prevent short-circuiting while simultaneously providing thermal insulation to reduce heat losses to components not intended to be heated, thereby improving heating efficiency without complicating the heating element structure itself
Solution Approach 2:
The electrically isolating substrate layer is designed to perform multiple functions simultaneously: electrical isolation of the heating element, thermal insulation to reduce heat loss, and structural support. This multi-functional approach addresses both the energy loss problem and maintains simplicity in the overall device design
2Use of energy by moving object
If the heating element is placed directly in contact with the heating chamber for efficient heating, then heating efficiency improves, but electrical short-circuiting occurs
Solution Approach 1:
The electrically isolating substrate layer acts as a mediator between the heating element and the heating chamber. It allows thermal energy to be transferred efficiently for heating while simultaneously providing electrical isolation to prevent short-circuiting, thus resolving the contradiction between heating efficiency and electrical safety
Solution Approach 2:
The substrate layer is implemented as a thin film structure that provides adequate thermal conduction for efficient heating while maintaining electrical isolation properties. The thin film design minimizes thermal resistance while preserving electrical insulation, enabling both heating efficiency and electrical safety
3Reliability
If separate inner and outer layers are used for thermal protection and electrical isolation, then protection effectiveness improves, but manufacturing complexity and costs increase
Solution Approach 1:
The patent combines the functions of separate inner and outer protective layers into a single electrically isolating substrate layer. This unified structure provides both thermal protection and electrical isolation capabilities, reducing manufacturing complexity and costs while maintaining effective protection of the heating element
Solution Approach 2:
The single substrate layer is designed with multi-functional properties to simultaneously provide electrical isolation, thermal insulation, and structural support. This eliminates the need for multiple separate layers, simplifying the manufacturing process and reducing overall costs while maintaining comprehensive protection effectiveness
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 reduces heat loss, minimizes energy consumption, and ensures safe operation by maintaining thermal and electrical isolation, while simplifying manufacturing and reducing costs.
Implementation Method 1
The substrate layer may be configured to reduce heat losses from the heating chamber
Implementation Method 2
The substrate layer is an electrically isolating substrate layer... to prevent a short-circuit of the heating element
Implementation Method 3
A heating element of a heating assembly is typically arranged in or around the heating chamber for heating the aerosol-forming substrate
Data Source
AI summary
A heating assembly for an aerosol-generating device is provided, the heating assembly including: a substrate layer that is an electrically isolating substrate layer; and a heating element arranged on a first portion of the substrate layer, the substrate layer including a second portion on which the heating element is not disposed, the substrate layer being rolled into a tubular shape, such that the first portion of the substrate layer is positioned as an inner layer, the second portion of the substrate layer being positioned as an outer layer surrounding the first portion of the substrate layer, and the heating element being arranged between the first portion of the substrate layer and the second portion of the substrate layer.