Microwave Heating Assembly with Gap-Tolerant Conductor Feed
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Solution Overview
Problem
Microwave heating assemblies in aerosol-generating devices face issues with thermal expansion and contraction leading to gaps between conductors, resulting in poor microwave feed due to size deviations during mechanical processing, which can cause failure.
Innovation Solution
The microwave heating assembly includes an insertion hole on the inner conductor unit or outer conductor unit for the feed end of the inner conductor, ensuring reliable microwave feeding by allowing gaps of less than 0.1 mm, even without direct contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inner conductor is in ohmic contact with the inner conductor unit and outer conductor unit, then microwave feeding is effective, but thermal expansion and contraction cause gaps to form between the conductors during heating
Solution Approach 1:
The patent applies the dynamics principle by making the connection between conductors adjustable rather than fixed. The inner conductor can be positioned at different locations on the inner conductor unit, and the outer conductor can be connected at different locations on the outer conductor unit. This dynamic positioning allows the system to adapt to thermal expansion and contraction, maintaining effective microwave feeding despite changes in dimensional stability.
Solution Approach 2:
The patent applies parameter changes by allowing variation in the connection parameters (positions and orientations) of the conductors. By providing multiple possible connection locations and enabling adjustment within certain ranges, the system can compensate for thermal dimensional changes. This transforms the rigid ohmic contact requirement into a flexible connection that maintains functionality under thermal stress.
2Ease of manufacture
If mechanical processing tolerance is within 0.01 mm to 0.05 mm, then manufacturing is feasible, but gaps form between conductors leading to poor microwave feed
Solution Approach 1:
The patent applies partial action by not requiring perfect precision throughout the entire assembly. Instead, it allows for intentional gaps within specific ranges (0.01-0.05 mm) at certain locations while maintaining overall functionality. This partial tolerance approach acknowledges manufacturing limitations while ensuring sufficient microwave feeding performance without demanding excessive precision.
Solution Approach 2:
The patent segments the conductor assembly into multiple connection points with independent positioning capabilities. By dividing the contact interface into separate locations on the inner conductor unit and outer conductor unit, the system can accommodate dimensional variations at each segment independently, reducing the impact of overall manufacturing tolerance accumulation.
3Power
If the feed end extends into the cavity to feed microwaves, then microwave transmission is achieved, but gaps between conductors cause transmission failure
Solution Approach 1:
The patent implements feedback through adjustable connection parameters that can be optimized based on performance. The system allows for tuning the positions and orientations of conductors to achieve optimal microwave feeding, enabling compensation for gaps and dimensional variations. This feedback mechanism ensures reliable power transmission despite manufacturing tolerances and thermal effects.
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 design enhances the reliability of microwave feeding by maintaining effective microwave transmission despite minor gaps, ensuring consistent operation of the aerosol-generating device.
Implementation Method 1
an inner conductor arranged in the outer conductor and comprising a feed end extending into the cavity so as to feed microwaves
Implementation Method 2
a microwave heating assembly for an aerosol-generating device... used for heating an aerosol-forming article by using microwaves for atomization
Data Source
AI summary
A microwave heating assembly for an aerosol-generating device includes: an outer conductor unit in a cylindrical shape and including an open end, a closed end opposite the open end, and a cavity located between the open end and the closed end; an inner conductor unit arranged in the cavity, one end of the inner conductor being connected to an end wall of the closed end, and an other end of the inner conductor unit extending toward the open end; and a microwave feed unit including: an outer conductor mounted on the outer conductor unit and in ohmic contact with the outer conductor unit, and an inner conductor arranged in the outer conductor and including a feed end extending into the cavity so as to feed microwaves. An insertion hole is provided on an inner side of the outer conductor unit or on the inner conductor unit.