Aerosol Heater Assembly With Localized Heating and Mount Insulation
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Solution Overview
Problem
Existing heating assemblies for aerosol-generating devices face challenges in achieving a robust, inexpensive design with localized heat generation for aerosol-forming substrates, while ensuring efficient heat distribution and temperature control.
Innovation Solution
A heating assembly comprising a heater with distinct portions of different materials and configurations, including a first portion with high electrical resistance for localized heating and a second portion with low thermal conductivity for heat insulation, mounted on a polymeric or ceramic substrate for structural support, and a heater mount to ensure secure fixation and temperature control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a heater is inserted into a solid aerosol-forming substrate to heat it directly and efficiently, then heating efficiency is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The heating element is divided into two distinct portions: a first portion with high electrical resistance positioned on the heating area for localized heat generation, and a second portion with low thermal conductivity positioned on the holding area for heat insulation. This segmentation allows the heater to efficiently heat the substrate while preventing excessive heat transfer to the mount, thereby maintaining heating efficiency without increasing overall device complexity
Solution Approach 2:
Different portions of the heating element are assigned different material properties and functions: the first portion has high electrical resistance for localized heating, while the second portion has low thermal conductivity for heat insulation. This local differentiation of properties enables the heater to perform multiple functions (heating and insulation) within a single component, improving heating efficiency without requiring additional separate components
2Reliability
If the heater is secured firmly to the housing, then reliability is improved, but heat transfer to the mount increases causing polymer degradation
Solution Approach 1:
The heating element's second portion is specifically designed with low thermal conductivity material and is positioned on the holding area where it contacts the heater mount. This local quality assignment ensures that while the heater remains firmly secured to the housing for reliability, the heat transfer to the mount is minimized, preventing polymer degradation
Solution Approach 2:
The second portion of the heating element acts as an intermediary between the high-temperature first portion and the heater mount. By using material with low thermal conductivity for this intermediate section, it mediates the heat transfer, allowing mechanical securement while blocking excessive heat flow to the mount
3Temperature
If the heating element uses high electrical resistance material for localized heating, then temperature control is improved, but manufacturing precision requirements increase
Solution Approach 1:
The heating element is segmented into two portions with different electrical resistance characteristics. The first portion uses high electrical resistance material for localized heating with precise temperature control, while the second portion uses low thermal conductivity material for heat insulation. This segmentation allows each portion to be optimized for its specific function, improving temperature control without requiring the entire element to meet high manufacturing precision standards
Solution Approach 2:
Different material properties are assigned to different portions of the heating element based on local requirements: high electrical resistance in the heating area for temperature control, and low thermal conductivity in the holding area for heat insulation. This local quality differentiation enables precise temperature control where needed while reducing manufacturing precision requirements in other areas
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 provides a robust, cost-effective heating assembly that efficiently heats aerosol-forming substrates with localized temperature control, minimizing heat transfer to the mount and maintaining optimal operating temperatures for aerosol production.
Implementation Method 1
the heating element comprises a first portion and a second portion configured such that, when an electrical current is passed through the heating element the first portion is heated to a higher temperature than the second portion
Implementation Method 2
the second portion of the heating element is positioned on a holding area of the heater substrate... the second portion with low thermal conductivity for heat insulation
Data Source
Figure 1~2
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Figure 5~6
AI summary
A heating assembly for heating an aerosol-forming substrate, the heating assembly comprising: a heater (14) comprising an electrically resistive heating element (82); and a heater mount (26) coupled to the heater (14); wherein the heating element comprises a first portion (84) and a second portion (86) configured such that, when an electrical current is passed through the heating element the first portion is heated to a higher temperature than the second portion as a result of the electrical current; wherein the heater mount surrounds the second portion of the heating element and is formed from a moulded polymeric material; and wherein the second portion (86) of the heating element comprises two sections, each of the two sections being separately connected to the first portion (84) of the heating element to define an electrical flow path from the one section of the second portion (86) to the first portion and then to the other section of the second portion.