Closed-Loop Dryer Passive Ventilation Using Motorized Vent Covers
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Solution Overview
Problem
Laundry dryer appliances face challenges in detecting and addressing obstructions in their exhaust air conduits, which can lead to inefficient ventilation and odor buildup, especially when the door is closed and the appliance is not in use.
Innovation Solution
The integration of a vent cover system with a wax motor-driven plunger seal that selectively opens and closes air conduits for ambient air intake and carbon monoxide exhaust, allowing for passive ventilation when the appliance is not in use, replacing or supplementing traditional methods that provide minimal ventilation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vent cover remains closed during idle periods, then the appliance maintains a sealed configuration, but odor buildup and poor ventilation occur
Solution Approach 1:
The vent cover system performs preliminary action by automatically opening during idle periods before the user returns or uses the appliance again. This proactive ventilation prevents odor buildup from occurring in the first place, rather than addressing it after the fact. The system anticipates the need for ventilation and acts in advance.
Solution Approach 2:
The vent cover operates autonomously based on the appliance's operational state, detecting when it is idle and automatically opening to ventilate. The system serves itself by monitoring its own state and taking appropriate action without requiring external intervention or user awareness of the ventilation need.
2Object-generated harmful factors
If the vent cover is always open, then ventilation is maximized, but energy loss and odor infiltration occur during operation
Solution Approach 1:
The vent cover transitions from a static always-open or always-closed design to a dynamic system that changes state based on operational conditions. It opens during idle periods to maximize ventilation and closes during operation to prevent energy loss, adapting its configuration to the current operational context for optimal performance.
Solution Approach 2:
The vent cover employs periodic action by alternating between open and closed states based on the appliance's operational cycle. During idle periods, it opens for ventilation; during operation, it closes to maintain efficiency. This periodic switching optimizes both ventilation and energy conservation at different times.
3Device complexity
If traditional ventilation methods are used, then the structure is simple, but ventilation effectiveness during idle periods is minimal
Solution Approach 1:
The patent replaces passive mechanical ventilation structures with an actively controlled motorized vent cover system. Instead of relying on simple fixed openings or gravity-based mechanisms, an electric motor actuates the vent cover to open and close precisely when needed, dramatically improving ventilation effectiveness during idle periods while maintaining acceptable structural 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 enhances ventilation and reduces odor buildup by allowing ambient air to enter and carbon monoxide to be exhausted when the appliance is idle, improving overall appliance performance and user experience.
Implementation Method 1
a wax motor-driven plunger seal that selectively opens and closes air conduits
Data Source
AI summary
A laundry appliance may include a front of the cabinet including a front bulkhead housing a first air conduit, the first air conduit defining a first opening configured to selectively receive ambient air, a back of the cabinet defining a basement area housing a second air conduit, the second air conduit defining a second opening for exhausting carbon monoxide outside of the appliance; a door configured to move between open and closed positions to selectively allow access the drum; a first cover arranged at the first opening; a second cover arranged at the second opening; and a processor programmed to instruct the first cover and second cover to open in response to the appliance being in a passive ventilation state.