Microwave Waveguide Mobile Short Circuit Heating Uniformity
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Solution Overview
Problem
Microwave ovens lack uniformity in heating large or low heat conductivity materials, such as asbestos, leading to inefficient heating and inertization due to non-homogeneous electromagnetic field distribution.
Innovation Solution
A microwave emitting system with a slotted waveguide and a mobile short circuit that alters the electromagnetic field configuration during microwave emission, combined with adjustable operating parameters, to ensure uniform and efficient heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed short circuit is used at the end of the wave guide, then the device structure is simple, but the heating uniformity of the material is poor
Solution Approach 1:
The patent applies the dynamics principle by making the short circuit mobile instead of fixed. The short circuit can move along the wave guide to change the electromagnetic field distribution dynamically during microwave emission, which improves heating uniformity of the material while maintaining relatively simple device structure.
2Manufacturing precision
If the short circuit is made mobile to vary the wave guide length, then the electromagnetic field distribution is improved, but the device complexity increases
Solution Approach 1:
The short circuit is designed to be mobile along the wave guide, allowing dynamic adjustment of the wave guide's effective length. This enables continuous variation of the electromagnetic field distribution, achieving homogeneous heating of materials while the mobility mechanism keeps the structural complexity manageable.
3Productivity
If conventional microwave heating is used for large asbestos slabs, then the process is simple, but the heating efficiency is low due to low heat conductivity
Solution Approach 1:
By making the short circuit mobile, the system can dynamically adjust the electromagnetic field penetration depth and distribution. This allows microwaves to penetrate deeper into large asbestos slabs more effectively, significantly improving heating efficiency and reducing the time required to reach internal portions of the material.
Solution Approach 2:
The mobile short circuit enables continuous variation of electromagnetic field parameters (intensity, distribution, penetration depth) within the wave guide. By optimizing these parameters dynamically, the system overcomes the low heat conductivity of asbestos and achieves efficient heating of large slabs without excessive process time.
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 configuration provides continuous variation of the electromagnetic field, ensuring deep and rapid uniform heating, enhancing heating efficiency and reducing thermal inertia, making it suitable for large or thermally inert materials like asbestos.
Implementation Method 1
the distribution of the electromagnetic field in the wave guide can be continuously altered during the emitting of microwaves by the microwave emitting system
Implementation Method 2
microwave generators, which comprise a microwave source, for example a magnetron, which, when electrically supplied, generates electromagnetic waves
Implementation Method 3
the heating of the material does not appear homogeneous and uniform... the lack of uniformity of the heating necessarily translates into a low heating efficiency of all the volume of the item
Data Source
AI summary
A microwave emitting system (10) which comprises a source of microwaves (20), a longitudinal wave guide (30) connected at a first end (311) to the source such as to receive the microwaves generated thereby and provided with a slot (34) from which the microwaves are irradiated and a short circuit (42) slidably associated to the second end (311) of the wave guide and mobile such as to vary a length of the wave guide (30), characterised in that the short circuit (42) is mobile in alternating motion between a neared and distanced position from the second end of the wave guide (30) continuously and discontinuously during emission of microwaves by the source of microwaves (20).