Microwave Heating Cavity with Nested Dielectric Sleeve and Wire Antenna
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Solution Overview
Problem
Existing microwave heating technologies face challenges in miniaturization, energy efficiency, and effective heating of dielectric media, particularly due to limitations in volumetric heating and residue issues with surface contact heating methods.
Innovation Solution
A microwave heating cavity design that incorporates a metal shell with a middle cavity, a heating sleeve with a dielectric medium, and an antenna bracket with a ceramic rod and spirally wound metal wire, enabling both volumetric and surface contact heating modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multi-feed input microwave heating is used, then volumetric heating efficiency is improved, but device size increases making miniaturization difficult
Solution Approach 1:
The heating cavity is segmented into multiple functional zones: a first mounting cavity for the heating sleeve, a second mounting cavity for the antenna bracket, and a concave air cavity connecting them. This segmentation allows compact arrangement of components while maintaining effective volumetric heating through the dielectric medium positioned in the heating sleeve.
Solution Approach 2:
The heating sleeve is nested within the first mounting cavity, with the dielectric medium nested within the heating sleeve. The antenna bracket with ceramic rod and metal wire is nested in the second mounting cavity. This nested structure achieves miniaturization by efficiently utilizing space while maintaining volumetric heating capability.
2Device complexity
If surface contact heating is used, then device structure is simplified, but heating efficiency and energy utilization are reduced
Solution Approach 1:
The invention merges two heating approaches by positioning both the heating sleeve (providing surface contact heating through the dielectric medium) and the antenna bracket with metal wire (providing volumetric microwave heating) within the same compact cavity structure. This combination achieves both simplified structure and high heating efficiency.
3Reliability
If heating sleeve with dielectric medium is used, then heating effectiveness is improved, but residue accumulation occurs making cleaning difficult
Solution Approach 1:
The dielectric medium is extracted from a fixed integrated structure and positioned within the removable heating sleeve. This allows the heating sleeve containing the dielectric medium to be easily removed and cleaned separately from the main cavity, solving the cleaning difficulty while maintaining heating effectiveness through the dielectric medium.
4Ease of operation
If metal sheets are added for electromagnetic eddy current heating, then heating function is achieved, but device complexity and material requirements increase
Solution Approach 1:
The invention replaces the mechanical/electromagnetic eddy current heating system (requiring metal sheets) with a microwave-based heating system using a dielectric medium and metal wire antenna. This substitution eliminates the need for additional metal sheets while achieving effective heating through dielectric heating and resistive heating mechanisms.
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 achieves efficient and rapid heating of dielectric media through balanced volumetric and surface contact heating, improving energy utilization and facilitating the miniaturization of heating appliances.
Implementation Method 1
electromagnetic field/microwave is formed, which penetrates the heating sleeve and heats the dielectric medium in the manner of volumetric heating
Implementation Method 2
The concave air cavity is conducive to the propagation of the microwave emitted from the metal wire
Implementation Method 3
a part of the microwave energy is directly converted into thermal energy which can be transferred to the dielectric medium through the ceramic rod that is in contact with the dielectric medium, forming a surface contact heating
Data Source
AI summary
A microwave heating cavity includes a metal shell, a heating sleeve, a dielectric medium, an antenna bracket, a ceramic rod and a metal wire. The metal shell is provided with a middle cavity extending through the metal shell and including a first mounting cavity, a concave air cavity and a second mounting cavity. The heating sleeve is mounted in the first mounting cavity. An accommodating cavity is arranged in the heating sleeve, in which the dielectric medium is arranged. The antenna bracket is mounted in the second mounting cavity. The ceramic rod is mounted on the antenna bracket. The ceramic rod extends into the accommodating cavity and is in contact with the dielectric medium. The metal wire is spirally wound around the ceramic rod and is configured to be connected with an external power.