Closed-Loop Dryer Passive Ventilation to Reduce Odor Buildup
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Solution Overview
Problem
Laundry dryer appliances often experience obstruction in exhaust air conduits due to lint and objects, leading to inadequate ventilation and odor buildup, especially when not in use.
Innovation Solution
A passive ventilation system with selectively openable air conduits controlled by a wax motor-driven plunger seal, allowing ambient air intake and carbon monoxide exhaust, which supplements traditional methods by providing ventilation even when the appliance door is closed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional ventilation methods are used (only during operation), then energy consumption is reduced, but odor buildup occurs during non-use periods
Solution Approach 1:
The passive ventilation system performs ventilation action in advance during non-use periods, preventing odor buildup before it becomes a problem. The plunger seal is positioned to allow ambient air intake and exhaust airflow during idle periods, proactively maintaining air quality without energy consumption during active drying cycles
Solution Approach 2:
The system uses the dryer's own structure (plunger seal, air conduits) to provide passive ventilation during non-use periods without requiring external power sources or additional active components. The design leverages natural pressure differentials and the existing mechanical seal to achieve self-regulated ventilation
2Reliability
If the plunger seal is kept closed to prevent air leakage, then sealing performance is improved, but ventilation during non-use periods is blocked
Solution Approach 1:
The plunger seal transitions from a static closed position to a dynamic system that opens automatically during non-use periods. The seal's position changes based on operational state - closed during active drying to maintain sealing, and open during idle periods to enable passive ventilation, resolving the contradiction between sealing reliability and ventilation accessibility
Solution Approach 2:
The plunger seal operates periodically - closed during active drying cycles and open during non-use periods. This periodic switching allows the system to maintain sealing performance when needed while providing ventilation accessibility during idle periods, eliminating the need for constant compromise between the two requirements
3Productivity
If passive ventilation openings are added for ambient air intake and CO exhaust, then ventilation effectiveness is improved, but device complexity increases
Solution Approach 1:
The existing plunger seal mechanism is given multiple functions: it seals during active drying and enables passive ventilation during non-use periods. The air conduits serve dual purposes by providing both operational airflow paths and passive ventilation channels. This multi-functionality improves ventilation effectiveness without adding separate dedicated components for each function
Solution Approach 2:
The patent merges the sealing function and passive ventilation function into a single integrated system using the plunger seal and air conduits. Instead of adding separate active ventilation components, the design combines sealing and ventilation capabilities into the existing mechanical structure, improving ventilation effectiveness while minimizing increases in device complexity
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
This solution effectively reduces odor buildup and ensures continuous ventilation in laundry dryers by allowing ambient air intake and carbon monoxide exhaust, even during non-use periods, improving air circulation and reducing the risk of conduit obstruction.
Implementation Method 1
The plunger seal may be controlled by a wax motor to move between open and closed positions
Data Source
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AI summary
A laundry appliance may include a front of the cabinet (12) including a front bulkhead (30) housing a first air conduit (45), the first air conduit (45) defining a first opening (47) configured to selectively receive ambient air, a back of the cabinet (12) defining a basement area (50) housing a second air conduit (52), the second air conduit (52) defining a second opening (54) for exhausting carbon monoxide outside of the appliance; a door (26) configured to move between open and closed positions to selectively allow access the drum (28); a first cover (42) arranged at the first opening (47); a second cover (44) arranged at the second opening (52); and a processor programmed to instruct the first cover (42) and second cover (44) to open in response to the appliance being in a passive ventilation state.