Microwave Heating Device with Inversion for Dual-Surface Browning
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Solution Overview
Problem
Microwave cooking and reheating methods often result in spotty heating, lack of browning, and undesirably soggy food due to inefficient energy conversion and moisture retention.
Innovation Solution
A device and method for microwave heating that uses a base and cover with metallic susceptors to convert microwave energy into thermal energy, featuring apertures for steam venting and inversion for enhanced browning and crisping, ensuring even heating and moisture reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If microwave energy is directly applied to food items, then heating occurs quickly, but the heating is spotty and uneven
Solution Approach 1:
The patent introduces a susceptor as an intermediary material between the microwave energy source and the food. The susceptor absorbs microwave energy and converts it to thermal energy, which then transfers to the food through conduction and convection. This intermediary approach ensures more uniform heat distribution throughout the food while maintaining rapid heating speeds.
Solution Approach 2:
The patent replaces direct microwave heating (electromagnetic field action) with thermal conduction heating. By using susceptors that convert microwave energy to heat, the system substitutes the direct electromagnetic heating mechanism with a thermal conduction mechanism, resulting in more uniform heating patterns.
2Temperature
If microwave containers with susceptors are used, then browning occurs on the portion in contact with the container, but only localized browning is achieved
Solution Approach 1:
The patent employs inversion of the heating chamber during the heating process. By inverting the chamber, different portions of the food come into contact with the susceptor surface, enabling browning on multiple faces of the food item. This inversion technique expands the browning area coverage from a single contact point to multiple surfaces.
Solution Approach 2:
The patent introduces dynamic movement (inversion) of the heating chamber to change the contact between food and susceptor during the heating process. This dynamic adjustment allows different regions of the food to receive thermal energy and achieve browning, thereby increasing the overall browning area coverage.
3Productivity
If microwave heating is performed without venting, then heating occurs, but the food becomes soggy with high moisture content
Solution Approach 1:
The patent extracts excess moisture from the food by providing venting mechanisms in the heating chamber. The vents allow steam and excess moisture to escape during the heating process, preventing the food from becoming soggy while maintaining efficient heating rates.
Solution Approach 2:
The patent utilizes phase transition of water from liquid to vapor form during heating. By providing venting mechanisms, the system allows the phase-changed moisture (steam) to escape, thereby removing excess liquid content from the food and preventing sogginess while maintaining heating efficiency.
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 solution achieves improved browning and crisping of food by utilizing susceptors to convert microwave energy into thermal energy, while apertures allow steam venting, resulting in more evenly cooked and crispy food products.
Implementation Method 1
uses a base and cover with metallic susceptors to convert microwave energy into thermal energy
Implementation Method 2
apertures for steam venting
Implementation Method 3
apertures in the cover for venting
Data Source
AI summary
A device for microwave heating with inversion has a base and a cover defining a heating chamber. Both the base and the cover include a susceptor heatable by microwave energy and the cover includes an aperture to vent steam. With a food product in the heating chamber, the device is placed in a microwave oven resting on the base. During an initial heating period, the lower surface of the food product is browned or crisped due to conduction and steam escapes from the heating chamber via the aperture. After the initial heating period, the device in inverted and the food product comes into contact with the cover. The device is placed in the microwave oven resting on the cover during a secondary heating period in which the food product is heated further, and the upper surface of the food product is browned or crisped due to conduction.