Air Filter Sensor Using Propeller Speed for Clog Detection
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Solution Overview
Problem
Smaller scale air conditioning units lack sensors to detect filter clogging, leading to reduced energy efficiency and cooling capability due to ignored filter maintenance, and there is a need for a portable, user-friendly device to monitor filter condition without disturbing users at undesirable times.
Innovation Solution
A filter sensor system with a housing-mounted propeller that senses air flow, a motion sensor to measure propeller rotation, and a controller to correlate rotational speed with filter condition, providing an indicator for filter status and allowing alert delay during night hours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a filter sensor system is added to smaller scale air conditioning units, then filter condition monitoring capability is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex electronic sensor systems with a simple mechanical propeller-based airflow measurement system. The propeller rotates in response to airflow through the air conditioner, and this mechanical rotation is detected by a motion sensor to determine filter condition, thereby achieving filter monitoring without complex electronics.
Solution Approach 2:
The patent introduces a propeller as an intermediary mechanical element that converts airflow information into rotational motion. This propeller acts as a mediator between the airflow (which indicates filter condition) and the motion sensor, simplifying the measurement process while maintaining detection accuracy.
2Reliability
If continuous monitoring is implemented, then filter maintenance timing is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic monitoring instead of continuous monitoring, where the system checks filter condition at intervals rather than constantly. This approach maintains reliable maintenance timing information while significantly reducing the energy consumption of the sensor system, as the motion sensor and controller only need to operate periodically.
3Loss of information
If alarm alerts are activated immediately, then user awareness is improved, but user disturbance increases
Solution Approach 1:
The patent provides preliminary information about filter condition status without immediately triggering disruptive alarms. The system first informs users of the filter status, allowing them to plan maintenance at convenient times rather than being disturbed by immediate alarms, thus delivering information while avoiding harmful user disturbance.
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 filter sensor system effectively monitors air filter condition, providing users with timely alerts for maintenance, improving energy efficiency and cooling performance while minimizing nighttime disturbances.
Implementation Method 1
A propeller is mounted in the interior passage. The propeller is rotated by the air flow through the air conditioning system.
Implementation Method 2
A motion sensor is provided to sense the propeller rotation.
Data Source
AI summary
A filter sensor to monitor an air filter in an air conditioning system is disclosed. The filter sensor includes a housing having an interior passage. The housing is located in relation to an air vent of the air conditioning system. A propeller is mounted in the interior passage. The propeller is rotated by the filtered air flow of the air conditioning system. A motion sensor is provided in proximity to the propeller or its shaft. A controller is coupled to the motion sensor to determine the rotational speed of the propeller and correlate the rotational speed of the propeller with the condition of the filter. An indicator is coupled to the controller to indicate a status of the air filter.