Ventilation valve and control system for venting fresh air within a laundry appliance
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Solution Overview
Problem
Laundry appliances lack an effective mechanism to allow fresh air into the processing space when not in use, leading to potential buildup of noxious gases and moisture issues during spin cycles.
Innovation Solution
A passively operable vent system that includes a rotating drum with a perforated wall and a pitot mechanism, which selectively opens and closes to allow ambient air flow between the processing space and outside when the appliance is not in use, and seals during high-speed spin functions to prevent moisture loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the vent is kept open to allow fresh air circulation when idle, then air quality improves and noxious gases are prevented, but moisture loss occurs during spin cycles
Solution Approach 1:
The vent is designed to dynamically change its state between open and closed positions based on operational conditions. During idle periods, the vent remains open to allow fresh air circulation and prevent noxious gas buildup. During high-speed spin cycles, the vent automatically closes to prevent moisture loss from the drum. This dynamic adaptability resolves the contradiction by allowing the vent to serve different functions at different times.
Solution Approach 2:
The vent system incorporates a feedback mechanism that responds to drum rotation speed or operational state. When the drum reaches high-speed spin conditions, the system detects this state and triggers the vent to close. During idle or low-speed conditions, the vent remains open. This feedback-based control allows the vent to automatically adjust its behavior based on real-time operational conditions, preventing both noxious gas buildup and unnecessary moisture loss.
2Loss of substance
If the vent remains closed during spin function to prevent moisture loss, then moisture containment improves, but fresh air circulation is blocked when not in use
Solution Approach 1:
The vent transitions from a static closed position to a dynamic system that opens during idle periods and closes during spin cycles. This dynamic behavior ensures that the vent remains closed during high-speed spin functions to prevent moisture loss, while automatically opening when the appliance is not in use to allow fresh air circulation and prevent air stagnation.
Solution Approach 2:
The system uses feedback from operational sensors to control vent position. When the appliance detects idle or non-spin conditions, it opens the vent to allow air circulation. When high-speed spin is detected, the vent closes to retain moisture. This feedback mechanism ensures optimal moisture retention during spin functions while preventing air stagnation during idle periods.
3Device complexity
If a passive vent system is used to allow automatic air flow, then device complexity is reduced, but control precision over vent opening/closing is limited
Solution Approach 1:
The vent system is designed to be self-regulating, using the appliance's own operational characteristics (drum rotation, air pressure changes, or temperature variations) to automatically control vent opening and closing. No external control system or additional actuators are required - the vent responds naturally to the operational conditions it experiences. This self-service approach maintains simplicity while achieving adequate control precision for the application.
Solution Approach 2:
The passive vent system utilizes pneumatic principles where pressure differentials created during drum operation naturally control vent position. During high-speed spin, centrifugal forces and pressure changes automatically seal the vent. During idle periods, atmospheric pressure allows the vent to remain open. This pneumatic-based control achieves timing precision without adding mechanical 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
Enables continuous fresh air circulation when the appliance is idle and effectively contains moisture during spin cycles, preventing noxious gas buildup and ensuring efficient drainage.
Implementation Method 1
The operable vent includes a pitot mechanism that extends from the interstitial space to a diaphragm contained within a valve body. Rotation of the rotating drum during the spin function generates a dynamic pressure that expands the diaphragm to engage a valve seat of the valve body to define the closed position of the operable vent.
Implementation Method 2
Rotation of the rotating drum during the spin function generates a dynamic pressure that expands the diaphragm to engage a valve seat of the valve body
Implementation Method 3
Rotation of the rotating drum during the spin function generates a dynamic pressure that expands the diaphragm to engage a valve seat of the valve body
Data Source
AI summary
A combination washing and drying appliance includes a tub positioned within an outer cabinet. A rotating drum includes a perforated wall. The rotating drum is rotationally operable within the tub. A blower delivers process air through an airflow path that includes a processing space within the rotating drum and an interstitial space defined between the tub and the rotating drum. An operable vent is selectively operable between a venting position and a closed position. The operable vent defines a passive flow of ambient air between the processing space and an area outside of the tub. The operable vent is operable to the closed position during a spin function of the rotating drum.