Oven bake heating channel exchange system
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Solution Overview
Problem
The presence of turbulent airflow from the convection fan in gas ovens affects the flame of the gas burner, causing it to separate and extinguish, which hampers ignition and reduces efficiency.
Innovation Solution
A heat duct system is positioned to isolate the combustion gases from the turbulent airflow, allowing them to enter and exit through specific channels, ensuring the flame is protected from fan-generated turbulence and can be ignited effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a convection fan is used to blow hot air over food for faster and more even cooking, then cooking efficiency is improved, but the turbulent airflow from the fan separates and extinguishes the flame from the gas burner, reducing burner efficiency
Solution Approach 1:
The patent divides the oven cavity into separate functional zones: a convection zone with the fan for air circulation and a burner zone with the gas burner for flame generation. This spatial segmentation allows the fan to operate at high speeds for efficient cooking without its turbulent airflow directly interfering with and extinguishing the burner flame, thus resolving the contradiction between cooking efficiency and burner reliability.
2Productivity
If the convection fan operates at high speed to improve cooking speed, then productivity is improved, but the turbulent airflow hampers ignition operation and blows gas away from the ignitor
Solution Approach 1:
The patent creates spatially separated zones for fan operation and ignition/burner operation. The burner is positioned in a location where it is not directly exposed to the high-speed turbulent airflow from the fan, allowing reliable ignition and stable flame maintenance even when the fan operates at high speeds for fast cooking.
Solution Approach 2:
The patent introduces a physical structure (burner housing or shroud) that acts as an intermediary barrier between the fan's turbulent airflow and the burner/ignitor assembly. This intermediary protects the ignition system from direct exposure to high-velocity air currents, ensuring reliable ignition while allowing the fan to operate efficiently.
3Loss of time
If the fan airflow is increased to cook food more quickly, then cooking time is reduced, but the flame stability deteriorates due to separation and extinguishment
Solution Approach 1:
The patent segments the oven interior into distinct functional regions: a convection circulation region where high-speed fan airflow rapidly moves hot air over food for quick cooking, and a protected burner region where the flame maintains stable combustion. This spatial segmentation enables simultaneous achievement of reduced cooking time and maintained flame stability.
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 allows for higher fan speeds and direct application of combustion gases as a cooking medium, minimizing thermal losses and improving cooking efficiency by maintaining a stable flame.
Implementation Method 1
turbulent air flow from the fan affects the flame from the burner
Implementation Method 2
The fan blows hot air from the heating element(s) over and around food in the cooking cavity
Data Source
AI summary
A cooking appliance includes: a cooking cavity with a bottom wall and a rear wall. A convection fan is disposed adjacent to the rear wall of the cooking cavity. A gas burner is located in a subjacent space beneath the bottom wall and adjacent to the rear wall of the cooking cavity. A heat duct provides communication through the bottom wall and includes an inlet positioned directly above and adjacent to the gas burner through which combustion gases from the gas burner can enter the heat duct. An annular portion of the heat duct defines a pass-through opening in which the convection fan is disposed. Flames from the gas burner extend upwardly toward or through the inlet of the heat duct and are substantially isolated from turbulent air flow generated by the convection fan.