Oven Cavity Fire Detection With Vent Damper Containment
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Solution Overview
Problem
Oven appliances lack effective detection and containment mechanisms for fires and smoke during self-cleaning, baking, or broiling operations, posing risks to users due to unawareness of developing fires or smoke within the cooking chamber.
Innovation Solution
Incorporating a temperature sensor and controller to monitor the rate of temperature change and compare it to a reference rate, along with a vent damper system to contain and extinguish fires by reducing oxygen supply, and providing user warnings through a user interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a temperature sensor and controller are added to monitor temperature changes, then fire detection capability is improved, but device complexity increases
Solution Approach 1:
The controller performs multiple functions: it monitors temperature changes, compares them to reference rates, detects fires, activates warnings, and controls the vent damper system. This multi-functionality consolidates what could be separate systems into a single controller, improving reliability without proportionally increasing complexity.
Solution Approach 2:
The system uses the existing heating element's energy source and the existing vent structure, adapting them for fire containment. The controller leverages existing components (temperature sensor, vent damper) rather than requiring entirely new systems, reducing the complexity burden of added detection capabilities.
2Reliability
If a vent damper system is added to contain fire by reducing oxygen supply, then fire containment capability is improved, but device complexity increases
Solution Approach 1:
The vent damper serves dual purposes: it controls smoke exhaust during normal cooking operations and seals the cooking chamber to contain fires by cutting off oxygen supply. This multi-functionality allows fire containment capability to be added without requiring a separate dedicated fire suppression system.
Solution Approach 2:
The system changes the vent damper's position parameter from an open state (for normal exhaust) to a closed state (for fire containment). By controlling the damper's position, the system dynamically adjusts oxygen supply to the cooking chamber, enabling fire containment using an existing component.
3Object-affected harmful factors
If automatic door locking and vent closure are implemented upon fire detection, then user safety is improved, but ease of operation decreases
Solution Approach 1:
The controller pre-programmed containment actions (door locking, vent closure) that automatically execute when fire conditions are detected. This preliminary preparation of response actions eliminates the need for user decision-making during a fire event, prioritizing safety over ease of operation when hazards are present.
Solution Approach 2:
The controller continuously monitors temperature changes and uses this feedback to automatically trigger containment actions. When the rate of temperature change exceeds the reference rate indicating a fire, the system responds automatically by locking the door and closing the vent, creating a closed-loop safety system that operates independently of user intervention.
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
Effectively detects and contains fires within the oven chamber, preventing user exposure to smoke and flames by automatically locking the door and reducing oxygen supply, enhancing safety during high-temperature operations.
Implementation Method 1
a temperature sensor; and a controller configured for monitoring a rate of temperature change ΔT within the cooking chamber
Implementation Method 2
containing the fire within the cooking chamber... reducing oxygen supply
Data Source
AI summary
An oven appliance with features for detecting and containing a fire and/or smoke within the cooking chamber of the oven appliance is provided. A method for operating an oven appliance to detect and contain a fire and/or smoke within the cooking chamber of the oven appliance is also provided.