Sensor Fan Control for Microwave Cooktop Monitoring
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Solution Overview
Problem
Sensors in over-the-range microwave appliances can become contaminated by grease and moisture, impeding their ability to monitor the cooktop effectively, especially when users cannot monitor the cooktop during use.
Innovation Solution
A method for operating fans within the appliance that includes a sensor fan, an exhaust fan, and a control fan, where the sensor fan operates at different power levels based on the status of the exhaust fan and the presence of a heating element, ensuring air is directed over the sensor to prevent contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor is mounted above the cooktop to monitor the cooktop, then the ability to monitor the cooktop is improved, but the sensor becomes contaminated by grease and moisture which impedes sensing
Solution Approach 1:
The patent extracts the sensor from the direct exposure zone by mounting it on the exhaust fan assembly, where it can monitor the cooktop through the exhaust pathway without being directly in the path of grease and moisture rising from the cooktop surface
Solution Approach 2:
The exhaust fan assembly serves as an intermediary structure that allows the sensor to observe the cooktop through the exhaust air flow pathway, acting as a mediator between the sensor and the monitored area while protecting the sensor from direct contamination
2Productivity
If the exhaust fan draws air through the duct to remove fumes and grease, then the air circulation function is improved, but the sensor fan must operate at different power levels to maintain proper air flow and prevent contamination
Solution Approach 1:
The sensor fan operates dynamically with variable power levels - running at full power when the exhaust fan is off to maintain baseline air flow, and adjusting to partial power when the exhaust fan is running to coordinate with the exhaust air flow and prevent sensor contamination while maintaining monitoring function
Solution Approach 2:
The control system monitors the exhaust fan status and automatically adjusts the sensor fan power level in response, creating a feedback-controlled system that coordinates the operation of both fans to maintain optimal air flow and sensor protection
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 method effectively keeps the sensor clean and functional by using the fans to manage air flow, ensuring continuous monitoring of the cooktop even when users are not present.
Implementation Method 1
The sensor fan urges air out of the duct of the cabinet via the chamber of the housing when the sensor fan is operating
Implementation Method 2
the circulation system can draw fumes, smoke, grease, and/or steam away from the cooktop of the oven range appliance
Implementation Method 3
The control fan and the sensor fan urge air out of the duct of the cabinet via the chamber of the housing when the sensor fan is operating at the second power and the control fan is activated
Data Source
AI summary
A method for operating fans within a microwave appliance is provided. The microwave appliance includes a sensor fan and an exhaust fan. The method includes operating the sensor fan of the microwave appliance when the exhaust fan of the microwave appliance is running. The sensor fan of the microwave appliances urges air over a sensor of the microwave appliance when the sensor fan is operating.