Microwave Heating Uniformity via Multi-Port Field Control
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Solution Overview
Problem
Microwave ovens often provide uneven heating, leading to regions of food being under or overcooked, and existing solutions like rotating turntables increase complexity and risk of malfunction.
Innovation Solution
A microwave heating apparatus with multiple feeding ports and a control unit that determines and adjusts microwave intensity zones based on desired temperature patterns for different regions of the load, eliminating the need for rotating parts and allowing simultaneous heating of multiple items.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rotating turntable is used to distribute heating evenly, then heating uniformity is improved, but device complexity and risk of malfunction increase
Solution Approach 1:
The patent replaces the mechanical rotating turntable system with an electromagnetic field-based solution. Multiple magnetrons positioned at different locations generate microwaves that interfere constructively and destructively to create moving heating patterns without any mechanical moving parts. This substitution eliminates the complexity of motors, bearings, and control systems while achieving the same heating distribution effect.
Solution Approach 2:
The patent divides the single heating source into multiple magnetrons positioned at different locations within the cavity. Each magnetron contributes to the overall heating pattern, and their combined electromagnetic fields create a more uniform distribution of energy throughout the food, replacing the need for mechanical rotation to achieve uniformity.
2Stability of the object's composition
If heating time is extended to ensure all parts are properly heated, then heating completeness is improved, but energy consumption and risk of burning increase
Solution Approach 1:
The patent creates periodic moving heating patterns through the interference of microwaves from multiple magnetrons. The heating zones move and shift throughout the cavity over time, ensuring all parts of the food receive adequate energy exposure. This periodic redistribution of heating intensity allows for shorter overall heating times while maintaining completeness, as each region receives focused heating during its pass through the high-intensity zones.
Solution Approach 2:
The patent changes the spatial and temporal parameters of the electromagnetic field by using multiple magnetrons with different positions and potentially different operating powers. This creates a dynamic heating pattern that evolves over time, allowing the system to deliver the required total energy more efficiently and reduce the risk of localized overheating and burning.
3Stability of the object's composition
If multiple moving parts are introduced to improve heating distribution, then heating uniformity is improved, but reliability decreases
Solution Approach 1:
The patent eliminates mechanical moving parts by using stationary magnetrons that generate electromagnetic fields. The heating pattern movement is achieved through field interference rather than physical rotation, thereby removing components subject to wear, friction, and mechanical failure, and significantly improving system reliability.
Solution Approach 2:
The electromagnetic fields from the multiple magnetrons automatically interact and redistribute heating patterns through natural wave interference phenomena. No external control or adjustment mechanisms are needed - the system self-regulates the heating distribution through the physics of electromagnetic wave propagation and interference, improving reliability by removing control systems.
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 solution ensures even heating by adjusting microwave intensity zones within the microwave oven, reducing cooking time and energy consumption while simplifying the appliance's design and operation.
Implementation Method 1
a plurality of feeding ports (103a-d) for feeding microwaves from a plurality of microwave generators (104a-b) to the cavity (101)
Data Source
AI summary
A method of heating a load in a cavity using microwaves wherein the microwaves provide mode fields in the cavity includes obtaining a desired temperature pattern within said cavity based on information about regions of the load. A heating pattern in the cavity is determined and comprises zones of different intensities corresponding to the desired temperature pattern. A zone of higher intensity in the determined heating pattern corresponds to a region of higher temperature in the desired temperature pattern. The method also includes controlling one or more independently controllable microwave generators or feeding ports so the mode fields form the determined heating pattern and thereby heat the load according to the desired temperature pattern.