Methods and apparatus for high-heat cooking
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Solution Overview
Problem
Conventional domestic cooking appliances are limited to a maximum temperature of about 550° F due to safety regulations, preventing the achievement of higher cooking temperatures needed for certain cooking methods, such as brick-oven style pizza cooking which requires temperatures up to 750° F.
Innovation Solution
A rack assembly for an oven cavity comprising a ceramic cooking stone supported by an insulating mat and a rack, with a cooking operation that includes preheat, reduced-power, and increased-power stages to heat the stone and air to high temperatures without exceeding safety temperature limits, allowing for high-heat cooking without locking the oven door.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the oven cavity is heated to high temperatures (750° F.) for brick-oven style pizza cooking, then the cooking temperature requirement is met, but the oven door safety lock is triggered because the temperature exceeds 600° F.
Solution Approach 1:
The oven cavity is divided into two thermal zones: an upper cooking zone where high temperatures (750° F.) are achieved for pizza cooking, and a lower zone where temperatures are maintained below 600° F. to prevent triggering the safety lock. This spatial segmentation allows simultaneous achievement of high cooking temperature and safety compliance.
Solution Approach 2:
The rack assembly acts as a thermal intermediary structure between the heat source and the oven cavity. It concentrates and directs heat to the cooking stone and upper cavity region while providing thermal management that prevents excessive heat propagation to the lower cavity region where the temperature sensor is located, thus avoiding safety lock activation.
2Temperature
If a ceramic cooking stone is placed in the oven cavity for brick-oven style cooking, then the ideal cooking temperature of 750° F. can be achieved on the stone surface, but the overall oven cavity temperature cannot be maintained at this level due to safety regulations limiting the door lock trigger to 600° F.
Solution Approach 1:
The heating system is configured to provide localized high-temperature treatment specifically to the cooking stone and immediate surrounding area, while the rest of the oven cavity operates at lower temperatures. This local quality approach allows the cooking stone to reach 750° F. for optimal pizza cooking without requiring the entire oven cavity to be heated to the same temperature, thus avoiding safety lock activation and maintaining cooking operation flexibility.
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 cooking at temperatures up to 750° F within the oven cavity's upper portion without heating the lower portion to a temperature that triggers the oven door lock, ensuring safe operation while achieving desired cooking results.
Implementation Method 1
an insulating mat defining a recess configured to accommodate the cooking stone
Implementation Method 2
the broil element is operated according to a preheat-power scheme in order to heat the cooking stone and air within the oven cavity
Implementation Method 3
the cooking stone emits residual heat
Implementation Method 4
the broil element is operated according to an increased-power scheme
Data Source
AI summary
A rack assembly is mountable within an oven cavity of a cooking appliance. The rack assembly includes a cooking stone; an insulating mat defining a recess configured to accommodate the cooking stone; and a rack configured to support the insulating mat. A superficial area of the insulating mat is at least 70% of a superficial area of the rack.