Microwave Heating Container With Shielding Element
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Solution Overview
Problem
Microwave heating containers often experience hot spots, leading to overheating and charring, especially when used in single operating mode microwave ovens or without a turntable, causing uneven heating and food item damage.
Innovation Solution
The design incorporates a microwave energy shielding element with an incurved upper edge to reduce field strength and redistribute power, along with strategically placed microwave energy transparent areas to mitigate hot spots and promote even heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a microwave energy shielding element is used to prevent overheating of vulnerable areas, then protection of food item areas is improved, but hot spots adjacent to the shielding element cause charring of the container
Solution Approach 1:
The shielding element incorporates local quality variations through transparent areas at its periphery, creating zones with different microwave interaction properties. The peripheral regions have reduced shielding capability (higher transparency) compared to the central region, allowing controlled microwave energy distribution that prevents both food overheating and container charring simultaneously.
Solution Approach 2:
The shielding element's microwave interaction parameters are changed by introducing transparent areas that modify the electromagnetic field distribution. This parameter change allows the shielding element to adapt its function, reducing reflection in peripheral zones and enabling controlled energy transmission to prevent hot spot formation adjacent to the shielding structure.
2Device complexity
If a single operating mode microwave oven is used, then device simplicity is improved, but hot spots cause uneven heating and charring of the container
Solution Approach 1:
The patent converts the harmful hot spot effect into a beneficial heating pattern by designing the shielding element with transparent peripheral areas. These areas are strategically positioned to utilize the concentrated microwave energy at hot spot locations and redirect it toward the food item, transforming the problematic concentrated energy into useful heating zones while the incurved portions protect the container from excessive energy concentration.
Solution Approach 2:
The shielding element acts as an intermediary between the microwave field and the container walls. By incorporating transparent areas and incurved portions, it mediates the energy distribution, allowing controlled energy transmission in certain directions while blocking excessive energy in others, thus preventing direct heating of the container walls that would cause charring.
3Ease of manufacture
If the upper edge of the microwave energy shielding element is straight, then manufacturing simplicity is improved, but hot spots are not effectively reduced leading to container charring
Solution Approach 1:
The shielding element's upper edge is formed with an incurved configuration rather than a straight edge. This curvature modifies the electromagnetic field distribution by redirecting microwave energy away from the container walls, effectively reducing hot spot formation and preventing charring. The curved geometry creates a more favorable field pattern that reduces energy concentration at the periphery.
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 significantly reduces overheating and charring, ensuring more uniform heating of food items even in single operating mode microwave ovens without a turntable.
Implementation Method 1
a microwave energy shielding element comprising a metal foil or high optical density material operative for reflecting substantially all of impinging microwave energy
Implementation Method 2
The upper edge of the microwave energy shielding element is curved downwardly towards the base in the area(s) prone to charring... the incurved portion(s) of the microwave energy shielding element reduces the field strength and redistributes the power
Implementation Method 3
strategically placed microwave energy transparent areas to mitigate hot spots and promote even heating
Data Source
AI summary
A microwave heating construct comprises a base, a wall extending upwardly around the base for defining a cavity for receiving a food item, and a microwave energy shielding element overlying a lower margin of the wall, the microwave energy shielding element having an upper edge including a substantially incurved portion.