Variable-Cross-Section Heater Assembly for Frame Heat Isolation
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Solution Overview
Problem
Heat transfer from the heating element to other components of the aerosol-generating device, cartridge, or system causes damage and discomfort during use, affecting user experience.
Innovation Solution
A heater assembly with a heating element designed to have a serpentine shape and varying cross-sectional areas, featuring heating portions separated by attachment portions, which are integrated with a frame to minimize heat transfer and enhance robustness, allowing for efficient energy transfer while reducing component damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the heating element is secured to other components of the heater assembly to provide stability, then the heating element stability is improved, but heat transfer to other components increases causing damage and discomfort
Solution Approach 1:
The patent introduces attachment portions as intermediary elements between the heating portions and the frame. These attachment portions act as thermal barriers that reduce heat transfer to the frame while still providing mechanical support and stability for the heating element during operation.
Solution Approach 2:
The heating element is designed with varying cross-sectional areas where different portions serve different functions. The attachment portions have larger cross-sectional areas optimized for mechanical support and heat isolation, while the heating portions have smaller cross-sectional areas optimized for heating efficiency. This local differentiation allows simultaneous achievement of stability and heat transfer reduction.
2Ease of manufacture
If the heating element has a uniform cross-sectional area, then the manufacturing is simplified, but the heat transfer to the frame increases causing component damage
Solution Approach 1:
The heating element features non-uniform cross-sectional areas with distinct heating portions and attachment portions. Each portion is locally optimized for its specific function, with attachment portions having larger cross-sections for structural support and thermal isolation, while heating portions have smaller cross-sections for efficient heating.
Solution Approach 2:
The heating element is segmented into multiple functional portions along its length - heating portions for thermal generation and attachment portions for mechanical support and heat isolation. This segmentation allows each segment to be optimized independently for its specific purpose while maintaining overall structural integrity.
3Power
If the cross sectional area of heating portions is increased, then the heating efficiency is improved, but the heat transfer to the frame increases causing component damage and user discomfort
Solution Approach 1:
The heating element employs local quality differentiation where heating portions have smaller cross-sectional areas optimized for heating efficiency, while attachment portions have larger cross-sectional areas optimized for mechanical support and thermal isolation. This prevents excessive heat transfer to the frame while maintaining effective heating capability.
Solution Approach 2:
The heating element is divided into segmented portions with different cross-sectional areas. The heating portions are optimized for thermal generation with appropriate cross-sectional dimensions, while the attachment portions serve as thermal barriers with larger cross-sections that reduce heat conduction to the frame, thus protecting components from thermal damage.
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 design effectively reduces heat transfer to the frame, maintains component stability, and ensures efficient energy delivery, enhancing user comfort and device longevity.
Implementation Method 1
The heating element may be restively heated
Implementation Method 2
The cross sectional area of each heating portion perpendicular to the direction of the continuous electrical path may less than the cross sectional area of each attachment portion perpendicular to the direction of the continuous electrical path. Advantageously, heat transfer from the heating element to the frame is therefore reduced.
Data Source
AI summary
A heater assembly for an aerosol-generating device is provided, including: a heating element; first and second electrical contacts in electrical contact, respectively, with first and second ends of the element, the element providing a continuous electrical path between the first and the second contacts; and a frame including an aperture in a first plane, the element including heating portions and an attachment portion therebetween along the path, the element fixed to the frame and each heating portion within or overlying the aperture and separated from the frame by the attachment portion, a cross-sectional area of each heating portion perpendicular to a direction of the path being less than that of each attachment portion perpendicular to the direction, the element including a heat-isolating portion, each attachment portion separated from the frame by one heat-isolating portion, and the heating portions, the attachment portion, and the heat-isolating portion are all integrally formed.