Water Filter Cartridge Air Path Barrier for White Dust Reduction
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Solution Overview
Problem
Humidifiers using tap water often produce 'white dust' due to mineral evaporation, which can be minimized but not entirely eliminated by existing filter systems, requiring further reduction to improve user experience.
Innovation Solution
A water filter cartridge with a housing and air flow path featuring a first water barrier to prevent unfiltered water from escaping, including a vent opening and air plenum to maintain air flow while preventing water penetration, along with a second water barrier to prevent internal breakthroughs, and blocking means to manage air flow and filter operation independently of the device's mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a filter cartridge with ventilation channel and water barrier is used, then white dust formation is reduced, but unfiltered water still escapes via the air flow path
Solution Approach 1:
An air plenum is introduced as an intermediary chamber between the air flow path and the tank. This plenum collects air bubbles and allows them to rise to the surface before entering the tank, while the vent opening with specific dimensions (0.5-1mm) acts as a mediator that permits air passage but blocks water penetration through surface tension effects.
Solution Approach 2:
The vent opening dimensions are precisely controlled (0.5-1mm clear width) to exploit surface tension parameter changes. At this specific size range, the opening allows air bubbles to pass while preventing water penetration, effectively changing the selective permeability parameter of the barrier based on the physical properties of the fluids involved.
2Productivity
If the vent opening is made larger to improve air flow, then pressure equalization improves, but water penetration increases
Solution Approach 1:
The vent opening dimensions are precisely controlled (0.5-1mm clear width) to exploit surface tension parameter changes. At this specific size range, the opening allows air bubbles to pass while preventing water penetration, effectively changing the selective permeability parameter of the barrier based on the physical properties of the fluids involved.
Solution Approach 2:
The system utilizes pneumatic principles where air bubbles rise through the water column in the flow path and enter the air plenum. The air pressure differential and bubble dynamics are harnessed to maintain flow through the restricted vent opening without allowing liquid water to penetrate, leveraging gas-liquid flow differences.
3Reliability
If a first water barrier is added to prevent water escape, then unfiltered water leakage is reduced, but device complexity increases
Solution Approach 1:
The air plenum and vent opening are merged into a single integrated component structure. The air plenum serves dual functions: collecting air bubbles for removal and acting as a pre-chamber before the vent opening. This merging reduces the number of separate parts while maintaining the water barrier function.
Solution Approach 2:
The vent opening serves multiple functions simultaneously: it acts as an air passage, a water barrier, and a flow regulator. The same structural feature (the restricted opening) that enables pressure equalization also prevents water penetration and controls flow rate, eliminating the need for separate components for each function.
4Duration of action of moving object
If the water tank height is increased to hold more water, then operating time extends, but the bird bath principle effectiveness decreases
Solution Approach 1:
The air flow path is segmented into distinct zones: the air plenum chamber for bubble collection, the vent opening for selective passage, and the flow path for water filtration. This segmentation allows each zone to perform its specific function optimally, maintaining the bird bath principle effectiveness even in taller tanks by ensuring proper air-water separation at each stage.
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
Significantly reduces the occurrence of 'white dust' to less than 20% of filtered water, ensuring effective demineralization and extended operating times, allowing for complete tank emptying and easier handling of large volumes without manual rotation.
Implementation Method 1
this opening is made so small that, in contrast, air located in the flow path prevents water from penetrating due to its inherent surface tension
Implementation Method 2
there are already humidifier systems on the market that are equipped with demineralization cartridges or water filter cartridges
Data Source
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AI summary
The present invention relates to a water filter cartridge with a housing and a flow path for air for aerating a water tank that is stored and to be treated by the water filter cartridge. This is characterized in that the flow path has a first water barrier.