Self-Cleaning Lint Filter for Dryer Heat Exchanger Protection
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Solution Overview
Problem
Laundry appliances with heat pump systems face challenges in effectively removing lint particles from process air before they reach the heat exchanger, leading to potential blockages and reduced efficiency.
Innovation Solution
A self-cleaning lint filter system is integrated into the laundry appliance, featuring a rotating drum, blower, heat exchanger, and a fluid spray system with nozzles that direct fluid to capture and remove lint particles from the process air, ensuring they do not reach the heat exchanger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lint filter is installed upstream of the heat exchanger to capture lint particles, then the heat exchanger is protected from blockages, but the filter itself becomes blocked by lint and requires manual cleaning
Solution Approach 1:
The system uses the appliance's own condensate (water collected during the drying cycle) to automatically clean the lint filter. A spray nozzle directs this condensate onto the filter surface, washing lint into a collection reservoir. This self-cleaning mechanism eliminates manual intervention while maintaining continuous protection of the heat exchanger.
Solution Approach 2:
Condensate serves as an intermediary substance that transfers the cleaning function from the user to the system. Instead of requiring direct user action to clean the filter, the condensate acts as a medium that carries lint particles away from the filter surface and into the collection reservoir, enabling automatic maintenance.
2Ease of operation
If a removable lint filter is used, then the filter can be easily cleaned or replaced, but it occupies additional space and increases device complexity
Solution Approach 1:
The lint filter is integrated directly into the heat exchanger assembly, combining the filtration function with the heat exchange structure. This merging eliminates the need for separate removable filter components while maintaining the ability to capture lint particles, thereby reducing overall device complexity and space requirements.
Solution Approach 2:
The heat exchanger structure serves multiple functions: it performs heat exchange operations and simultaneously acts as the lint collection surface. By making the heat exchanger multi-functional, the system eliminates the need for a separate dedicated filter component, reducing structural complexity while maintaining effective lint capture.
3Productivity
If the lint filter is positioned to effectively capture lint, then lint removal efficiency is improved, but the filter becomes a source of blockages requiring frequent maintenance
Solution Approach 1:
The system performs lint removal continuously during the drying cycle through periodic spray actions. Rather than requiring separate maintenance intervals, the condensate spray operates periodically to wash lint from the filter surface, converting what would be periodic manual maintenance into continuous automated operation.
Solution Approach 2:
The lint filtering and cleaning operations run continuously throughout the drying cycle. The filter captures lint in real-time while the spray system simultaneously cleans the filter surface, ensuring uninterrupted operation without downtime for manual maintenance and maintaining constant productivity.
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 efficiently captures and removes lint particles, preventing blockages and maintaining the heat pump system's efficiency by using a combination of airflow paths, fixed lint filters, and fluid spray nozzles to direct lint away from the heat exchanger.
Implementation Method 1
A heat exchanger is positioned within the airflow path that dehumidifies the process air
Implementation Method 2
A fluid spray system has spray nozzles that deliver fluid to a surface of the fixedly-secured lint filter. Each spray nozzle of the plurality of spray nozzles directs captured lint away from the fixedly-secured lint filter
Data Source
AI summary
A laundry appliance includes a rotating drum for processing laundry. A blower directs process air through an airflow path that includes the rotating drum. A heat exchanger is positioned within the airflow path that dehumidifies the process air. A fixedly-secured lint filter captures lint from the process air at a position upstream of the heat exchanger. A fluid spray system has spray nozzles that deliver fluid to a surface of the fixedly-secured lint filter. Each spray nozzle of the plurality of spray nozzles directs captured lint away from the fixedly-secured lint filter.