Self-Cleaning Lint Filter Using Condensate Spray for Heat Pump Dryers
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Solution Overview
Problem
Laundry appliances with heat pump systems face challenges in effectively removing lint particles from process air to prevent blockages and maintain system efficiency, as existing lint filters require frequent manual cleaning and are not self-sustaining.
Innovation Solution
A self-cleaning lint filter system that utilizes a fluid delivery system with a blower, heat exchanger, and diverter valve to direct condensate and lint particles to spray nozzles for cleaning the lint filter, allowing for automated removal and recycling of debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lint filter is installed in the heat pump system to remove lint particles from process air, then system reliability is improved by preventing blockages, but device complexity increases due to the need for manual cleaning maintenance
Solution Approach 1:
The lint filter is equipped with a self-cleaning mechanism that automatically removes accumulated lint particles using a fluid delivery system with spray nozzles. The system uses condensate collected during normal operation to flush the filter, eliminating manual intervention and transforming the filter from a passive component requiring maintenance to an active self-maintaining component.
Solution Approach 2:
The system recovers condensate that would otherwise be waste and repurposes it for cleaning the lint filter. The fluid delivery system redirects condensate to spray nozzles that flush lint particles from the filter, thereby recovering a useful function from a waste product and reducing the need for external cleaning resources.
2Manufacturing precision
If manual cleaning of the lint filter is required to maintain system efficiency, then manufacturing precision of the filter can be optimized, but loss of time increases due to frequent maintenance interruptions
Solution Approach 1:
The automatic self-cleaning mechanism operates periodically without user intervention, eliminating the time loss associated with manual cleaning. The system uses a control mechanism to activate the fluid delivery system at appropriate intervals, maintaining filter performance continuously without requiring maintenance personnel or user time.
Solution Approach 2:
The self-cleaning mechanism ensures continuous operation of the lint filter by automatically removing lint buildup before it can significantly impede airflow. The periodic activation of the fluid delivery system maintains the filter in an optimal state throughout operation, preventing performance degradation and eliminating downtime for manual cleaning.
3Device complexity
If the lint filter is cleaned manually, then device complexity remains lower, but productivity decreases due to maintenance interruptions
Solution Approach 1:
The automatic self-cleaning system maintains filter performance without requiring maintenance interruptions, ensuring continuous productive operation of the heat pump system. The minimal increase in device complexity is offset by the elimination of productivity loss from manual cleaning, resulting in net productivity improvement.
Solution Approach 2:
The periodic automatic cleaning maintains uninterrupted airflow through the lint filter, preventing productivity degradation that would occur with manual cleaning interruptions. The system ensures continuous operation by automatically restoring filter performance before it can significantly impact system productivity.
4Ease of operation
If condensate is continuously recycled to spray nozzles for cleaning, then ease of operation is improved through automation, but use of energy increases due to pump and valve operation
Solution Approach 1:
The fluid delivery system operates periodically rather than continuously, with the pump and diverter valve activated only when cleaning cycles are required. The control mechanism determines optimal timing based on filter usage and lint accumulation patterns, reducing energy consumption while maintaining effective self-cleaning functionality.
Solution Approach 2:
The automatic control system manages the energy-consuming components (pump and diverter valve) without user intervention, activating them only when necessary for self-cleaning. This automation improves ease of operation by eliminating manual cleaning tasks while minimizing energy usage through intelligent, demand-based operation of the fluid delivery system.
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 ensures continuous operation by automatically cleaning the lint filter, reducing maintenance needs and preventing lint buildup in the heat pump system, thereby enhancing efficiency and reliability.
Implementation Method 1
A heat exchanger dehumidifies the process air and removes condensate therefrom
Implementation Method 2
A pump directs fluid from the drain channel and along a fluid path
Implementation Method 3
spray nozzles that direct a flow of the fluid onto a lint filter
Data Source
AI summary
A fluid delivery system for a laundry appliance includes a blower that delivers process air along an airflow path. A drum receives process air to dry laundry. A heat exchanger dehumidifies the process air and removes condensate therefrom. A drain channel receives condensate from the heat exchanger. A pump directs fluid from the drain channel and along a fluid path. The fluid at least partially includes the condensate. A fluid diverter valve receives the fluid from the pump and selectively and delivers the fluid sequentially to a plurality of spray nozzles that direct a flow of the fluid onto a lint filter and toward the drain channel and a fluid outlet.