Steamer insert and method of operating a microwave oven
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Solution Overview
Problem
Conventional microwave cooking methods often result in soggy vegetables due to direct exposure to microwave energy and water saturation, lacking the desired finish achieved by traditional steam cooking on a cooktop.
Innovation Solution
A steam cooker assembly for microwave ovens featuring a container with a water reservoir and a steamer insert positioned above the target fill line, shielded from microwave energy, which includes a perforated base to conduct heat evenly and trap steam, along with a pressure relief valve to ensure safe cooking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If vegetables are cooked directly in microwave energy, then cooking time is reduced, but the vegetables become soggy and lose quality
Solution Approach 1:
The steaming device is segmented into multiple functional components: a microwave-absorbing material layer that shields vegetables, a steam generation chamber, and a distribution system. This segmentation allows the microwave energy to be absorbed and converted to steam, which then cooks the vegetables indirectly, preventing direct microwave exposure while maintaining cooking efficiency
Solution Approach 2:
Water/steam acts as an intermediary medium between the microwave energy and the vegetables. The microwave energy heats the water, which then transforms into steam that cooks the vegetables. This intermediary approach prevents direct microwave-vegetable interaction, avoiding sogginess while achieving thorough cooking
2Temperature
If vegetables are saturated in water for cooking, then heat transfer is improved, but the vegetables become waterlogged and soggy
Solution Approach 1:
The system utilizes the phase transition of water from liquid to steam. Water is heated to generate steam, which then contacts the vegetables for cooking. The steam phase allows for effective heat transfer without waterlogging, as the vapor condenses and evaporates dynamically during the cooking process, maintaining vegetable texture
Solution Approach 2:
The microwave-absorbing material contains porous structures that facilitate steam generation and distribution. These porous materials allow steam to penetrate and circulate around the vegetables, providing uniform heat transfer while preventing water accumulation and sogginess
3Temperature
If a steamer insert is positioned below the water fill line, then steam generation is maximized, but microwave energy penetrates to the vegetables
Solution Approach 1:
The solution addresses the positioning problem by adding a vertical dimension consideration with the microwave-absorbing material layer. This layer creates an additional dimensional barrier between the microwave source and the vegetables, positioned above the water fill line to block microwave penetration while allowing steam to rise and contact the vegetables from above
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
Enables steaming of vegetables in a microwave oven without microwave energy contamination, maintaining food quality and safety through precise temperature control and steam management.
Implementation Method 1
microwave oven includes a cabinet defining a cooking chamber... one or more sources of microwave radiation
Implementation Method 2
perforated base to conduct heat evenly
Data Source
AI summary
A steam cooker assembly for use in a microwave oven includes a container defining a water reservoir and a target fill line and a steamer insert positioned inside the water reservoir and defining one or more food cavities, wherein a bottom wall of the steamer insert is positioned at or above the target fill line along a vertical direction.