Self-Cleaning Dryer Exhaust Filter Using Fan-Driven Lint Removal
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Solution Overview
Problem
Existing dryer exhaust systems fail to effectively address the lint fire hazard in homes and multi-unit dwellings, as previous solutions have not adequately prevented lint accumulation and ignition.
Innovation Solution
An exhaust system with a filter, fan, flow meter, pressure sensor, and display that automatically activates the fan to clear lint from the filter, optionally includes a water-primed lower housing and disposable liner, and can interrupt dryer power if sensors detect hazardous conditions, providing a self-cleaning and safety-enhancing lint collection system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter is used to collect lint, then lint accumulation is reduced, but the filter becomes clogged and requires manual cleaning
Solution Approach 1:
The system uses the dryer's own exhaust airflow to automatically clean the filter. A second fan creates positive pressure on the filter surface, forcing accumulated lint off the filter and into the collection chamber, eliminating manual cleaning requirements
Solution Approach 2:
The system extracts lint from the filter surface using airflow generated by the second fan, separating the cleaning function from manual intervention and integrating it into the automatic exhaust operation
2Productivity
If a booster fan is added to increase exhaust flow, then lint removal efficiency is improved, but device complexity increases
Solution Approach 1:
The second fan serves multiple functions: it creates positive pressure to clean the filter surface, drives lint into the collection chamber, and maintains exhaust flow. This multi-functionality justifies the additional component by consolidating several operations into one device
Solution Approach 2:
The filter cleaning function and lint collection function are merged into a single automated process driven by the second fan, rather than requiring separate manual cleaning operations and separate collection mechanisms
3Device complexity
If manual filter cleaning is required, then device complexity is reduced, but loss of time increases
Solution Approach 1:
The system performs filter cleaning continuously during dryer operation rather than requiring periodic shutdowns for manual maintenance. The second fan operates throughout the drying cycle to prevent lint accumulation, making maintenance time negligible
Solution Approach 2:
The system performs preliminary cleaning action by continuously removing lint as it accumulates on the filter, preventing clogging before it occurs rather than requiring reactive manual cleaning after the filter becomes blocked
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 system effectively reduces lint accumulation and ignition risk by automatically clearing lint from the filter and interrupting power when hazardous conditions are detected, making it safer and more efficient than previous solutions.
Implementation Method 1
The second fan is downstream from the filter and creates a positive pressure to clear the screen
Implementation Method 2
The exhaust system may further include a flow meter and the fan may be activated responsive to a measurement from the flow meter being below a predetermined level
Implementation Method 3
The exhaust system may further include a pressure sensor and the fan may be activated responsive to a measurement from the pressure sensor being below a predetermined level
Data Source
AI summary
An exhaust system includes a filter; and a fan downstream for the filter whereby activating the fan clears the filter. The exhaust system may form part of a lint collection system that is for attachment to a dryer.